source/mir/storage/Database.java

   1 /*
   2  * Copyright (C) 2001, 2002  The Mir-coders group
   3  *
   4  * This file is part of Mir.
   5  *
   6  * Mir is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * Mir is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with Mir; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  * In addition, as a special exception, The Mir-coders gives permission to link
  21  * the code of this program with the com.oreilly.servlet library, any library
  22  * licensed under the Apache Software License, The Sun (tm) Java Advanced
  23  * Imaging library (JAI), The Sun JIMI library (or with modified versions of
  24  * the above that use the same license as the above), and distribute linked
  25  * combinations including the two.  You must obey the GNU General Public
  26  * License in all respects for all of the code used other than the above
  27  * mentioned libraries.  If you modify this file, you may extend this exception
  28  * to your version of the file, but you are not obligated to do so.  If you do
  29  * not wish to do so, delete this exception statement from your version.
  30  */
  31
  32 package mir.storage;
  33
  34 import  java.sql.*;
  35 import  java.lang.*;
  36 import  java.io.*;
  37 import  java.util.*;
  38 import  java.text.SimpleDateFormat;
  39 import  java.text.ParseException;
  40 import  freemarker.template.*;
  41 import  com.codestudio.sql.*;
  42 import  com.codestudio.util.*;
  43
  44 import  mir.storage.StorageObject;
  45 import  mir.storage.store.*;
  46 import  mir.entity.*;
  47 import  mir.misc.*;
  48
  49
  50 /**
  51  * Diese Klasse implementiert die Zugriffsschicht auf die Datenbank.
  52  * Alle Projektspezifischen Datenbankklassen erben von dieser Klasse.
  53  * In den Unterklassen wird im Minimalfall nur die Tabelle angegeben.
  54  * Im Konfigurationsfile findet sich eine Verweis auf den verwendeten
  55  * Treiber, Host, User und Passwort, ueber den der Zugriff auf die
  56  * Datenbank erfolgt.
  57  *
  58  * @version $Revision: 1.21.2.1 $ $Date: 2002/09/01 21:31:41 $
  59  * @author $Author: mh $
  60  *
  61  * $Log: Database.java,v $
  62  * Revision 1.21.2.1  2002/09/01 21:31:41  mh
  63  * Mir goes GPL
  64  *
  65  * Revision 1.21  2002/08/04 23:38:22  mh
  66  * fix up the webdb_create update stuff
  67  *
  68  * Revision 1.20  2002/07/21 22:32:25  mh
  69  * on insert, the "webdb_lastchange" field should get a value
  70  *
  71  * Revision 1.19  2002/06/29 15:44:46  mh
  72  * make the webdb_create update be called webdb_create_update. it breaks things otherwise. a fixme case I know..
  73  *
  74  * Revision 1.18  2002/06/28 20:42:13  mh
  75  * added necessary bits in templates and Database.java to make webdb_create modifiable. make the conversion from sql/Timestamp to String more robust
  76  *
  77  *
  78  */
  79 public class Database implements StorageObject {
  80
  81         protected String                    theTable;
  82         protected String                    theCoreTable=null;
  83         protected String                    thePKeyName="id";
  84         protected int                       thePKeyType, thePKeyIndex;
  85         protected boolean                   evaluatedMetaData=false;
  86         protected ArrayList                 metadataFields,metadataLabels,
  87                                                                                                                                                         metadataNotNullFields;
  88         protected int[]                     metadataTypes;
  89         protected Class                     theEntityClass;
  90         protected StorageObject             myselfDatabase;
  91         protected SimpleList                popupCache=null;
  92         protected boolean                   hasPopupCache = false;
  93         protected SimpleHash                hashCache=null;
  94         protected boolean                   hasTimestamp=true;
  95         private String                      database_driver, database_url;
  96         private int                         defaultLimit;
  97         protected DatabaseAdaptor           theAdaptor;
  98         protected Logfile                   theLog;
  99         private static Class                GENERIC_ENTITY_CLASS=null,
 100                                       STORABLE_OBJECT_ENTITY_CLASS=null;
 101   private static SimpleHash           POPUP_EMTYLINE=new SimpleHash();
 102   protected static final ObjectStore  o_store=ObjectStore.getInstance();
 103   private SimpleDateFormat _dateFormatterOut =
 104                                     new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
 105   private SimpleDateFormat _dateFormatterIn =
 106                                     new SimpleDateFormat("yyyy-MM-dd HH:mm");
 107   private Calendar _cal = new GregorianCalendar();
 108
 109   private static final int _millisPerHour = 60 * 60 * 1000;
 110   private static final int _millisPerMinute = 60 * 1000;
 111
 112         static {
 113                 // always same object saves a little space
 114                 POPUP_EMTYLINE.put("key", ""); POPUP_EMTYLINE.put("value", "--");
 115     try {
 116       GENERIC_ENTITY_CLASS = Class.forName("mir.entity.StorableObjectEntity");
 117       STORABLE_OBJECT_ENTITY_CLASS = Class.forName("mir.entity.StorableObjectEntity");
 118     }
 119     catch (Exception e) {
 120       System.err.println("FATAL: Database.java could not initialize" + e.toString());
 121     }
 122   }
 123
 124
 125         /**
 126          * Kontruktor bekommt den Filenamen des Konfigurationsfiles übergeben.
 127          * Aus diesem file werden <code>Database.Logfile</code>,
 128          * <code>Database.Username</code>,<code>Database.Password</code>,
 129          * <code>Database.Host</code> und <code>Database.Adaptor</code>
 130          * ausgelesen und ein Broker für die Verbindugen zur Datenbank
 131          * erzeugt.
 132          *
 133          * @param   String confFilename Dateiname der Konfigurationsdatei
 134          */
 135         public Database() throws StorageObjectException {
 136                 theLog = Logfile.getInstance(MirConfig.getProp("Home")+
 137                                                                                                                                 MirConfig.getProp("Database.Logfile"));
 138                 String theAdaptorName=MirConfig.getProp("Database.Adaptor");
 139                 defaultLimit = Integer.parseInt(MirConfig.getProp("Database.Limit"));
 140                 try {
 141                         theEntityClass = GENERIC_ENTITY_CLASS;
 142                         theAdaptor = (DatabaseAdaptor)Class.forName(theAdaptorName).newInstance();
 143                 } catch (Exception e){
 144                         theLog.printError("Error in Database() constructor with "+
 145                                                                                                 theAdaptorName + " -- " +e.toString());
 146                         throw new StorageObjectException("Error in Database() constructor with "
 147                                                                                                                                                          +e.toString());
 148                 }
 149                 /*String database_username=MirConfig.getProp("Database.Username");
 150                 String database_password=MirConfig.getProp("Database.Password");
 151                 String database_host=MirConfig.getProp("Database.Host");
 152                 try {
 153                         database_driver=theAdaptor.getDriver();
 154                         database_url=theAdaptor.getURL(database_username,database_password,
 155                                                                                                                                                 database_host);
 156                         theLog.printDebugInfo("adding Broker with: " +database_driver+":"+
 157                                                                                                                 database_url  );
 158                         MirConfig.addBroker(database_driver,database_url);
 159                         //myBroker=MirConfig.getBroker();
 160                 }*/
 161         }
 162
 163         /**
 164          * Liefert die Entity-Klasse zurück, in der eine Datenbankzeile gewrappt
 165          * wird. Wird die Entity-Klasse durch die erbende Klasse nicht überschrieben,
 166          * wird eine mir.entity.GenericEntity erzeugt.
 167          *
 168          * @return Class-Objekt der Entity
 169          */
 170         public java.lang.Class getEntityClass () {
 171                 return  theEntityClass;
 172         }
 173
 174         /**
 175          * Liefert die Standardbeschränkung von select-Statements zurück, also
 176          * wieviel Datensätze per Default selektiert werden.
 177          *
 178          * @return Standard-Anzahl der Datensätze
 179          */
 180         public int getLimit () {
 181                 return  defaultLimit;
 182         }
 183
 184         /**
 185          * Liefert den Namen des Primary-Keys zurück. Wird die Variable nicht von
 186          * der erbenden Klasse überschrieben, so ist der Wert <code>PKEY</code>
 187          * @return Name des Primary-Keys
 188          */
 189         public String getIdName () {
 190                 return  thePKeyName;
 191         }
 192
 193         /**
 194          * Liefert den Namen der Tabelle, auf das sich das Datenbankobjekt bezieht.
 195          *
 196          * @return Name der Tabelle
 197          */
 198         public String getTableName () {
 199                 return  theTable;
 200         }
 201
 202         /*
 203          *   Dient dazu vererbte Tabellen bei objectrelationalen DBMS
 204          *   zu speichern, wenn die id einer Tabelle in der parenttabelle verwaltet
 205          *   wird.
 206          *   @return liefert theCoreTabel als String zurueck, wenn gesetzt, sonst
 207          *    the Table
 208          */
 209
 210         public String getCoreTable(){
 211                 if (theCoreTable!=null) return theCoreTable;
 212                 else return theTable;
 213         }
 214
 215         /**
 216          * Liefert Feldtypen der Felder der Tabelle zurueck (s.a. java.sql.Types)
 217          * @return int-Array mit den Typen der Felder
 218          * @exception StorageObjectException
 219          */
 220         public int[] getTypes () throws StorageObjectException {
 221                 if (metadataTypes == null)
 222                         get_meta_data();
 223                 return  metadataTypes;
 224         }
 225
 226         /**
 227          * Liefert eine Liste der Labels der Tabellenfelder
 228          * @return ArrayListe mit Labeln
 229          * @exception StorageObjectException
 230          */
 231         public ArrayList getLabels () throws StorageObjectException {
 232                 if (metadataLabels == null)
 233                         get_meta_data();
 234                 return  metadataLabels;
 235         }
 236
 237         /**
 238          * Liefert eine Liste der Felder der Tabelle
 239          * @return ArrayList mit Feldern
 240          * @exception StorageObjectException
 241          */
 242         public ArrayList getFields () throws StorageObjectException {
 243                 if (metadataFields == null)
 244                         get_meta_data();
 245                 return  metadataFields;
 246         }
 247
 248
 249         /*
 250          *   Gets value out of ResultSet according to type and converts to String
 251          *   @param inValue  Wert aus ResultSet.
 252          *   @param aType  Datenbanktyp.
 253          *   @return liefert den Wert als String zurueck. Wenn keine Umwandlung moeglich
 254          *           dann /unsupported value/
 255          */
 256         private String getValueAsString (ResultSet rs, int valueIndex, int aType) throws StorageObjectException {
 257                 String outValue = null;
 258                 if (rs != null) {
 259                         try {
 260                                 switch (aType) {
 261                                         case java.sql.Types.BIT:
 262                                                 outValue = (rs.getBoolean(valueIndex) == true) ? "1" : "0";
 263                                                 break;
 264                                         case java.sql.Types.INTEGER:case java.sql.Types.SMALLINT:case java.sql.Types.TINYINT:case java.sql.Types.BIGINT:
 265                                                 int out = rs.getInt(valueIndex);
 266                                                 if (!rs.wasNull())
 267                                                         outValue = new Integer(out).toString();
 268                                                 break;
 269                                         case java.sql.Types.NUMERIC:
 270             /** @todo Numeric can be float or double depending upon
 271              *  metadata.getScale() / especially with oracle */
 272                                                 long outl = rs.getLong(valueIndex);
 273                                                 if (!rs.wasNull())
 274                                                         outValue = new Long(outl).toString();
 275                                                 break;
 276                                         case java.sql.Types.REAL:
 277                                                 float tempf = rs.getFloat(valueIndex);
 278                                                 if (!rs.wasNull()) {
 279                                                         tempf *= 10;
 280                                                         tempf += 0.5;
 281                                                         int tempf_int = (int)tempf;
 282                                                         tempf = (float)tempf_int;
 283                                                         tempf /= 10;
 284                                                         outValue = "" + tempf;
 285                                                         outValue = outValue.replace('.', ',');
 286                                                 }
 287                                                 break;
 288                                         case java.sql.Types.DOUBLE:
 289                                                 double tempd = rs.getDouble(valueIndex);
 290                                                 if (!rs.wasNull()) {
 291                                                         tempd *= 10;
 292                                                         tempd += 0.5;
 293                                                         int tempd_int = (int)tempd;
 294                                                         tempd = (double)tempd_int;
 295                                                         tempd /= 10;
 296                                                         outValue = "" + tempd;
 297                                                         outValue = outValue.replace('.', ',');
 298                                                 }
 299                                                 break;
 300                                         case java.sql.Types.CHAR:case java.sql.Types.VARCHAR:case java.sql.Types.LONGVARCHAR:
 301                                                 outValue = rs.getString(valueIndex);
 302                                                 //if (outValue != null)
 303                                                         //outValue = StringUtil.encodeHtml(StringUtil.unquote(outValue));
 304                                                 break;
 305                                         case java.sql.Types.LONGVARBINARY:
 306                                                 outValue = rs.getString(valueIndex);
 307                                                 //if (outValue != null)
 308                                                 //outValue = StringUtil.encodeHtml(StringUtil.unquote(outValue));
 309                                                 break;
 310                                         case java.sql.Types.TIMESTAMP:
 311             // it's important to use Timestamp here as getting it
 312             // as a string is undefined and is only there for debugging
 313             // according to the API. we can make it a string through formatting.
 314             // -mh
 315                                           Timestamp timestamp = (rs.getTimestamp(valueIndex));
 316             if(!rs.wasNull()) {
 317               java.util.Date date = new java.util.Date(timestamp.getTime());
 318               outValue = _dateFormatterOut.format(date);
 319               _cal.setTime(date);
 320               int offset = _cal.get(Calendar.ZONE_OFFSET)+
 321                             _cal.get(Calendar.DST_OFFSET);
 322               String tzOffset = StringUtil.zeroPaddingNumber(
 323                                                      offset/_millisPerHour,2,2);
 324               outValue = outValue+"+"+tzOffset;
 325             }
 326                                                 break;
 327                                         default:
 328                                                 outValue = "<unsupported value>";
 329                                                 theLog.printWarning("Unsupported Datatype: at " + valueIndex +
 330                                                                 " (" + aType + ")");
 331                                 }
 332                         } catch (SQLException e) {
 333                                 throw  new StorageObjectException("Could not get Value out of Resultset -- "
 334                                                 + e.toString());
 335                         }
 336                 }
 337                 return  outValue;
 338         }
 339
 340         /*
 341          *   select-Operator um einen Datensatz zu bekommen.
 342          *   @param id Primaerschluessel des Datensatzes.
 343          *   @return liefert EntityObject des gefundenen Datensatzes oder null.
 344          */
 345         public Entity selectById(String id)     throws StorageObjectException
 346   {
 347                 if (id==null||id.equals(""))
 348                         throw new StorageObjectException("id war null");
 349
 350     // ask object store for object
 351     if ( StoreUtil.implementsStorableObject(theEntityClass) ) {
 352       String uniqueId = id;
 353       if ( theEntityClass.equals(StorableObjectEntity.class) )
 354         uniqueId+="@"+theTable;
 355       StoreIdentifier search_sid = new StoreIdentifier(theEntityClass, uniqueId);
 356       theLog.printDebugInfo("CACHE: (dbg) looking for sid " + search_sid.toString());
 357       Entity hit = (Entity)o_store.use(search_sid);
 358       if ( hit!=null ) return hit;
 359     }
 360
 361                 Statement stmt=null;Connection con=getPooledCon();
 362                 Entity returnEntity=null;
 363                 try {
 364                         ResultSet rs;
 365                         /** @todo better prepared statement */
 366                         String selectSql = "select * from " + theTable + " where " + thePKeyName + "=" + id;
 367                         stmt = con.createStatement();
 368                         rs = executeSql(stmt, selectSql);
 369                         if (rs != null) {
 370                                 if (evaluatedMetaData==false) evalMetaData(rs.getMetaData());
 371                                 if (rs.next())
 372                                         returnEntity = makeEntityFromResultSet(rs);
 373                                 else theLog.printDebugInfo("Keine daten fuer id: " + id + "in Tabelle" + theTable);
 374                                 rs.close();
 375                         }
 376                         else {
 377                                 theLog.printDebugInfo("No Data for Id " + id + " in Table " + theTable);
 378                         }
 379                 }
 380                 catch (SQLException sqe){
 381                         throwSQLException(sqe,"selectById"); return null;
 382                 }
 383                 catch (NumberFormatException e) {
 384                         theLog.printError("ID ist keine Zahl: " + id);
 385                 }
 386                 finally { freeConnection(con,stmt); }
 387
 388                 /** @todo OS: Entity should be saved in ostore */
 389                 return returnEntity;
 390         }
 391
 392
 393         /**
 394          *   select-Operator um Datensaetze zu bekommen, die key = value erfuellen.
 395          *   @param key  Datenbankfeld der Bedingung.
 396          *   @param value  Wert die der key anehmen muss.
 397          *   @return EntityList mit den gematchten Entities
 398          */
 399         public EntityList selectByFieldValue(String aField, String aValue)
 400                 throws StorageObjectException
 401         {
 402                 return selectByFieldValue(aField, aValue, 0);
 403         }
 404
 405         /**
 406          *   select-Operator um Datensaetze zu bekommen, die key = value erfuellen.
 407          *   @param key  Datenbankfeld der Bedingung.
 408          *   @param value  Wert die der key anehmen muss.
 409          *   @param offset  Gibt an ab welchem Datensatz angezeigt werden soll.
 410          *   @return EntityList mit den gematchten Entities
 411          */
 412         public EntityList selectByFieldValue(String aField, String aValue, int offset)
 413                 throws StorageObjectException
 414         {
 415                 return selectByWhereClause(aField + "=" + aValue, offset);
 416         }
 417
 418
 419         /**
 420          * select-Operator liefert eine EntityListe mit den gematchten Datensätzen zurück.
 421          * Also offset wird der erste Datensatz genommen.
 422          *
 423          * @param wc where-Clause
 424          * @return EntityList mit den gematchten Entities
 425          * @exception StorageObjectException
 426          */
 427         public EntityList selectByWhereClause(String where)
 428                 throws StorageObjectException
 429         {
 430                 return selectByWhereClause(where, 0);
 431         }
 432
 433
 434         /**
 435          * select-Operator liefert eine EntityListe mit den gematchten Datensätzen zurück.
 436          * Als maximale Anzahl wird das Limit auf der Konfiguration genommen.
 437          *
 438          * @param wc where-Clause
 439          * @param offset ab welchem Datensatz.
 440          * @return EntityList mit den gematchten Entities
 441          * @exception StorageObjectException
 442          */
 443         public EntityList selectByWhereClause(String whereClause, int offset)
 444                 throws StorageObjectException
 445         {
 446                 return selectByWhereClause(whereClause, null, offset);
 447         }
 448
 449
 450         /**
 451          * select-Operator liefert eine EntityListe mit den gematchten Datensätzen zurück.
 452          * Also offset wird der erste Datensatz genommen.
 453          * Als maximale Anzahl wird das Limit auf der Konfiguration genommen.
 454          *
 455          * @param wc where-Clause
 456          * @param ob orderBy-Clause
 457          * @return EntityList mit den gematchten Entities
 458          * @exception StorageObjectException
 459          */
 460
 461         public EntityList selectByWhereClause(String where, String order)
 462                 throws StorageObjectException {
 463                 return selectByWhereClause(where, order, 0);
 464         }
 465
 466
 467         /**
 468          * select-Operator liefert eine EntityListe mit den gematchten Datensätzen zurück.
 469          * Als maximale Anzahl wird das Limit auf der Konfiguration genommen.
 470          *
 471          * @param wc where-Clause
 472          * @param ob orderBy-Clause
 473          * @param offset ab welchem Datensatz
 474          * @return EntityList mit den gematchten Entities
 475          * @exception StorageObjectException
 476          */
 477
 478         public EntityList selectByWhereClause(String whereClause, String orderBy, int offset)
 479                 throws StorageObjectException {
 480                 return selectByWhereClause(whereClause, orderBy, offset, defaultLimit);
 481         }
 482
 483
 484         /**
 485          * select-Operator liefert eine EntityListe mit den gematchten Datensätzen zurück.
 486          * @param wc where-Clause
 487          * @param ob orderBy-Clause
 488          * @param offset ab welchem Datensatz
 489          * @param limit wieviele Datensätze
 490          * @return EntityList mit den gematchten Entities
 491          * @exception StorageObjectException
 492          */
 493
 494         public EntityList selectByWhereClause(String wc, String ob, int offset, int limit)
 495                 throws StorageObjectException
 496   {
 497
 498     // check o_store for entitylist
 499     if ( StoreUtil.implementsStorableObject(theEntityClass) ) {
 500       StoreIdentifier search_sid =
 501         new StoreIdentifier( theEntityClass,
 502                              StoreContainerType.STOC_TYPE_ENTITYLIST,
 503                              StoreUtil.getEntityListUniqueIdentifierFor(theTable,wc,ob,offset,limit) );
 504       EntityList hit = (EntityList)o_store.use(search_sid);
 505       if ( hit!=null ) {
 506         theLog.printDebugInfo("CACHE (hit): " + search_sid.toString());
 507         return hit;
 508       }
 509     }
 510
 511                 // local
 512                 EntityList    theReturnList=null;
 513                 Connection    con=null; Statement stmt=null;
 514                 ResultSet     rs;
 515                 int           offsetCount = 0, count=0;
 516
 517                 // build sql-statement
 518
 519                 /** @todo count sql string should only be assembled if we really count
 520                  *  see below at the end of method //rk */
 521
 522                 if (wc != null && wc.length() == 0) {
 523                         wc = null;
 524                 }
 525                 StringBuffer countSql = new StringBuffer("select count(*) from ").append(theTable);
 526                 StringBuffer selectSql = new StringBuffer("select * from ").append(theTable);
 527                 if (wc != null) {
 528                         selectSql.append(" where ").append(wc);
 529                         countSql.append(" where ").append(wc);
 530                 }
 531                 if (ob != null && !(ob.length() == 0)) {
 532                         selectSql.append(" order by ").append(ob);
 533                 }
 534                 if (theAdaptor.hasLimit()) {
 535                         if (limit > -1 && offset > -1) {
 536                                 selectSql.append(" limit ");
 537                                 if (theAdaptor.reverseLimit()) {
 538                                         selectSql.append(limit).append(",").append(offset);
 539                                 }
 540                                 else {
 541                                         selectSql.append(offset).append(",").append(limit);
 542                                 }
 543                         }
 544                 }
 545
 546                 // execute sql
 547                 try {
 548                         con = getPooledCon();
 549                         stmt = con.createStatement();
 550
 551                         // selecting...
 552                         rs = executeSql(stmt, selectSql.toString());
 553                         if (rs != null) {
 554                                 if (!evaluatedMetaData) evalMetaData(rs.getMetaData());
 555
 556                                 theReturnList = new EntityList();
 557                                 Entity theResultEntity;
 558                                 while (rs.next()) {
 559                                         theResultEntity = makeEntityFromResultSet(rs);
 560                                         theReturnList.add(theResultEntity);
 561                                         offsetCount++;
 562                                 }
 563                                 rs.close();
 564                         }
 565
 566                         // making entitylist infos
 567                         if (!(theAdaptor.hasLimit())) count = offsetCount;
 568
 569                         if (theReturnList != null) {
 570                                 // now we decide if we have to know an overall count...
 571                                 count=offsetCount;
 572                                 if (limit > -1 && offset > -1) {
 573                                         if (offsetCount==limit) {
 574                                                 /** @todo counting should be deffered to entitylist
 575                                                  *  getSize() should be used */
 576                                                 rs = executeSql(stmt, countSql.toString());
 577                                                 if (rs != null) {
 578                                                         if ( rs.next() ) count = rs.getInt(1);
 579                                                         rs.close();
 580                                                 }
 581                                                 else theLog.printError("Could not count: " + countSql);
 582                                         }
 583                                 }
 584                                 theReturnList.setCount(count);
 585                                 theReturnList.setOffset(offset);
 586                                 theReturnList.setWhere(wc);
 587                                 theReturnList.setOrder(ob);
 588         theReturnList.setStorage(this);
 589         theReturnList.setLimit(limit);
 590                                 if ( offset >= limit )
 591                                         theReturnList.setPrevBatch(offset - limit);
 592                                 if ( offset+offsetCount < count )
 593                                         theReturnList.setNextBatch(offset + limit);
 594         if ( StoreUtil.implementsStorableObject(theEntityClass) ) {
 595           StoreIdentifier sid=theReturnList.getStoreIdentifier();
 596           theLog.printDebugInfo("CACHE (add): " + sid.toString());
 597           o_store.add(sid);
 598         }
 599                         }
 600                 }
 601                 catch (SQLException sqe) { throwSQLException(sqe, "selectByWhereClause"); }
 602                 finally { freeConnection(con, stmt); }
 603
 604                 return  theReturnList;
 605         }
 606
 607
 608         /**
 609          *  Bastelt aus einer Zeile der Datenbank ein EntityObjekt.
 610          *
 611          *  @param rs Das ResultSetObjekt.
 612          *  @return Entity Die Entity.
 613          */
 614         private Entity makeEntityFromResultSet (ResultSet rs)
 615                 throws StorageObjectException
 616         {
 617                 /** @todo OS: get Pkey from ResultSet and consult ObjectStore */
 618                 HashMap theResultHash = new HashMap();
 619                 String theResult = null;
 620                 int theType;
 621                 Entity returnEntity = null;
 622                 try {
 623                         int size = metadataFields.size();
 624                         for (int i = 0; i < size; i++) {
 625                                 // alle durchlaufen bis nix mehr da
 626                                 theType = metadataTypes[i];
 627                                 if (theType == java.sql.Types.LONGVARBINARY) {
 628                                         InputStreamReader is = (InputStreamReader)rs.getCharacterStream(i + 1);
 629                                         if (is != null) {
 630                                                 char[] data = new char[32768];
 631                                                 StringBuffer theResultString = new StringBuffer();
 632                                                 int len;
 633                                                 while ((len = is.read(data)) > 0) {
 634                                                         theResultString.append(data, 0, len);
 635                                                 }
 636                                                 is.close();
 637                                                 theResult = theResultString.toString();
 638                                         }
 639                                         else {
 640                                                 theResult = null;
 641                                         }
 642                                 }
 643                                 else {
 644                                         theResult = getValueAsString(rs, (i + 1), theType);
 645                                 }
 646                                 if (theResult != null) {
 647                                         theResultHash.put(metadataFields.get(i), theResult);
 648                                 }
 649                         }
 650       if (theEntityClass != null) {
 651         returnEntity = (Entity)theEntityClass.newInstance();
 652         returnEntity.setValues(theResultHash);
 653         returnEntity.setStorage(myselfDatabase);
 654         if ( returnEntity instanceof StorableObject ) {
 655           theLog.printDebugInfo("CACHE: ( in) " + returnEntity.getId() + " :"+theTable);
 656           o_store.add(((StorableObject)returnEntity).getStoreIdentifier());
 657         }
 658       } else {
 659         throwStorageObjectException("Internal Error: theEntityClass not set!");
 660       }
 661                 } catch (IllegalAccessException e) {
 662                         throwStorageObjectException("Kein Zugriff! -- " + e.toString());
 663                 } catch (IOException e) {
 664                         throwStorageObjectException("IOException! -- " + e.toString());
 665                 } catch (InstantiationException e) {
 666                         throwStorageObjectException("Keine Instantiiierung! -- " + e.toString());
 667                 } catch (SQLException sqe) {
 668                         throwSQLException(sqe, "makeEntityFromResultSet");
 669                         return  null;
 670                 }
 671                 return  returnEntity;
 672         }
 673
 674         /**
 675          * insert-Operator: fügt eine Entity in die Tabelle ein. Eine Spalte WEBDB_CREATE
 676          * wird automatisch mit dem aktuellen Datum gefuellt.
 677          *
 678          * @param theEntity
 679          * @return der Wert des Primary-keys der eingefügten Entity
 680          */
 681         public String insert (Entity theEntity) throws StorageObjectException {
 682                 //cache
 683                 invalidatePopupCache();
 684
 685     // invalidating all EntityLists corresponding with theEntityClass
 686     if ( StoreUtil.implementsStorableObject(theEntityClass) ) {
 687       StoreContainerType stoc_type =
 688         StoreContainerType.valueOf( theEntityClass,
 689                                     StoreContainerType.STOC_TYPE_ENTITYLIST);
 690       o_store.invalidate(stoc_type);
 691     }
 692
 693                 String returnId = null;
 694                 Connection con = null; PreparedStatement pstmt = null;
 695
 696     try {
 697                         ArrayList streamedInput = theEntity.streamedInput();
 698                         StringBuffer f = new StringBuffer();
 699                         StringBuffer v = new StringBuffer();
 700                         String aField, aValue;
 701                         boolean firstField = true;
 702                         // make sql-string
 703                         for (int i = 0; i < getFields().size(); i++) {
 704                                 aField = (String)getFields().get(i);
 705                                 if (!aField.equals(thePKeyName)) {
 706                                         aValue = null;
 707                                         // sonderfaelle
 708                                         if (aField.equals("webdb_create") ||
 709               aField.equals("webdb_lastchange")) {
 710                                                 aValue = "NOW()";
 711                                         }
 712                                         else {
 713                                                 if (streamedInput != null && streamedInput.contains(aField)) {
 714                                                         aValue = "?";
 715                                                 }
 716                                                 else {
 717                                                         if (theEntity.hasValueForField(aField)) {
 718                                                                 aValue = "'" + StringUtil.quote((String)theEntity.getValue(aField))
 719                                                                                 + "'";
 720                                                         }
 721                                                 }
 722                                         }
 723                                         // wenn Wert gegeben, dann einbauen
 724                                         if (aValue != null) {
 725                                                 if (firstField == false) {
 726                                                         f.append(",");
 727                                                         v.append(",");
 728                                                 }
 729                                                 else {
 730                                                         firstField = false;
 731                                                 }
 732                                                 f.append(aField);
 733                                                 v.append(aValue);
 734                                         }
 735                                 }
 736                         }         // end for
 737                         // insert into db
 738                         StringBuffer sqlBuf = new StringBuffer("insert into ").append(theTable).append("(").append(f).append(") values (").append(v).append(")");
 739                         String sql = sqlBuf.toString();
 740                         theLog.printInfo("INSERT: " + sql);
 741                         con = getPooledCon();
 742                         con.setAutoCommit(false);
 743                         pstmt = con.prepareStatement(sql);
 744                         if (streamedInput != null) {
 745                                 for (int i = 0; i < streamedInput.size(); i++) {
 746                                         String inputString = (String)theEntity.getValue((String)streamedInput.get(i));
 747                                         pstmt.setBytes(i + 1, inputString.getBytes());
 748                                 }
 749                         }
 750                         int ret = pstmt.executeUpdate();
 751                         if(ret == 0){
 752                                 //insert failed
 753                                 return null;
 754                         }
 755                         pstmt = con.prepareStatement(theAdaptor.getLastInsertSQL((Database)myselfDatabase));
 756                         ResultSet rs = pstmt.executeQuery();
 757                         rs.next();
 758                         returnId = rs.getString(1);
 759                         theEntity.setId(returnId);
 760                 } catch (SQLException sqe) {
 761                         throwSQLException(sqe, "insert");
 762                 } finally {
 763                         try {
 764                                 con.setAutoCommit(true);
 765                         } catch (Exception e) {
 766                                 ;
 767                         }
 768                         freeConnection(con, pstmt);
 769                 }
 770     /** @todo store entity in o_store */
 771                 return  returnId;
 772         }
 773
 774         /**
 775          * update-Operator: aktualisiert eine Entity. Eine Spalte WEBDB_LASTCHANGE
 776          * wird automatisch mit dem aktuellen Datum gefuellt.
 777          *
 778          * @param theEntity
 779          */
 780         public void update (Entity theEntity) throws StorageObjectException
 781   {
 782                 Connection con = null; PreparedStatement pstmt = null;
 783                 /** @todo this is stupid: why do we prepare statement, when we
 784                  *  throw it away afterwards. should be regular statement
 785                  *  update/insert could better be one routine called save()
 786                  *  that chooses to either insert or update depending if we
 787                  *  have a primary key in the entity. i don't know if we
 788                  *  still need the streamed input fields. // rk  */
 789
 790                 /** @todo extension: check if Entity did change, otherwise we don't need
 791      *  the roundtrip to the database */
 792
 793                 /** invalidating corresponding entitylists in o_store*/
 794     if ( StoreUtil.implementsStorableObject(theEntityClass) ) {
 795       StoreContainerType stoc_type =
 796         StoreContainerType.valueOf( theEntityClass,
 797                                     StoreContainerType.STOC_TYPE_ENTITYLIST);
 798       o_store.invalidate(stoc_type);
 799     }
 800
 801                 ArrayList streamedInput = theEntity.streamedInput();
 802                 String id = theEntity.getId();
 803                 String aField;
 804                 StringBuffer fv = new StringBuffer();
 805                 boolean firstField = true;
 806                 //cache
 807                 invalidatePopupCache();
 808                 // build sql statement
 809                 for (int i = 0; i < getFields().size(); i++) {
 810                         aField = (String)metadataFields.get(i);
 811                         // only normal cases
 812                         if (!(aField.equals(thePKeyName) || aField.equals("webdb_create") ||
 813                                         aField.equals("webdb_lastchange") || (streamedInput != null && streamedInput.contains(aField)))) {
 814                                 if (theEntity.hasValueForField(aField)) {
 815                                         if (firstField == false) {
 816                                                 fv.append(", ");
 817                                         }
 818                                         else {
 819                                                 firstField = false;
 820                                         }
 821                                         fv.append(aField).append("='").append(StringUtil.quote((String)theEntity.getValue(aField))).append("'");
 822                                 }
 823                         }
 824                 }
 825                 StringBuffer sql = new StringBuffer("update ").append(theTable).append(" set ").append(fv);
 826                 // exceptions
 827                 if (metadataFields.contains("webdb_lastchange")) {
 828                         sql.append(",webdb_lastchange=NOW()");
 829                 }
 830     // special case: the webdb_create requires the field in yyyy-mm-dd HH:mm
 831     // format so anything extra will be ignored. -mh
 832                 if (metadataFields.contains("webdb_create") &&
 833         theEntity.hasValueForField("webdb_create")) {
 834       // minimum of 10 (yyyy-mm-dd)...
 835       if (theEntity.getValue("webdb_create").length() >= 10) {
 836         String dateString = theEntity.getValue("webdb_create");
 837         // if only 10, then add 00:00 so it doesn't throw a ParseException
 838         if (dateString.length() == 10)
 839           dateString=dateString+" 00:00";
 840
 841         // TimeStamp stuff
 842         try {
 843           java.util.Date d = _dateFormatterIn.parse(dateString);
 844           Timestamp tStamp = new Timestamp(d.getTime());
 845           sql.append(",webdb_create='"+tStamp.toString()+"'");
 846         } catch (ParseException e) {
 847           throw new StorageObjectException(e.toString());
 848         }
 849       }
 850                 }
 851                 if (streamedInput != null) {
 852                         for (int i = 0; i < streamedInput.size(); i++) {
 853                                 sql.append(",").append(streamedInput.get(i)).append("=?");
 854                         }
 855                 }
 856                 sql.append(" where id=").append(id);
 857                 theLog.printInfo("UPDATE: " + sql);
 858                 // execute sql
 859                 try {
 860                         con = getPooledCon();
 861                         con.setAutoCommit(false);
 862                         pstmt = con.prepareStatement(sql.toString());
 863                         if (streamedInput != null) {
 864                                 for (int i = 0; i < streamedInput.size(); i++) {
 865                                         String inputString = theEntity.getValue((String)streamedInput.get(i));
 866                                         pstmt.setBytes(i + 1, inputString.getBytes());
 867                                 }
 868                         }
 869                         pstmt.executeUpdate();
 870                 } catch (SQLException sqe) {
 871                         throwSQLException(sqe, "update");
 872                 } finally {
 873                         try {
 874                                 con.setAutoCommit(true);
 875                         } catch (Exception e) {
 876                                 ;
 877                         }
 878                         freeConnection(con, pstmt);
 879                 }
 880         }
 881
 882         /*
 883          *   delete-Operator
 884          *   @param id des zu loeschenden Datensatzes
 885          *   @return boolean liefert true zurueck, wenn loeschen erfolgreich war.
 886          */
 887         public boolean delete (String id) throws StorageObjectException {
 888
 889                 invalidatePopupCache();
 890     // ostore send notification
 891     if ( StoreUtil.implementsStorableObject(theEntityClass) ) {
 892       String uniqueId = id;
 893       if ( theEntityClass.equals(StorableObjectEntity.class) )
 894         uniqueId+="@"+theTable;
 895                         theLog.printInfo("CACHE: (del) " + id);
 896                         StoreIdentifier search_sid =
 897         new StoreIdentifier(theEntityClass, StoreContainerType.STOC_TYPE_ENTITY, uniqueId);
 898       o_store.invalidate(search_sid);
 899                 }
 900
 901                 /** @todo could be prepared Statement */
 902                 Statement stmt = null; Connection con = null;
 903                 int res = 0;
 904                 String sql="delete from "+theTable+" where "+thePKeyName+"='"+id+"'";
 905                 theLog.printInfo("DELETE " + sql);
 906                 try {
 907                         con = getPooledCon(); stmt = con.createStatement();
 908                         res = stmt.executeUpdate(sql);
 909                 }
 910     catch (SQLException sqe) { throwSQLException(sqe, "delete"); }
 911     finally { freeConnection(con, stmt); }
 912
 913                 return  (res > 0) ? true : false;
 914         }
 915
 916         /* noch nicht implementiert.
 917          * @return immer false
 918          */
 919         public boolean delete (EntityList theEntityList) {
 920                 invalidatePopupCache();
 921                 return  false;
 922         }
 923
 924         /**
 925          * Diese Methode sollte ueberschrieben werden, wenn fuer die abgeleitete Database-Klasse
 926          * eine SimpleList mit Standard-Popupdaten erzeugt werden koennen soll.
 927          * @return null
 928          */
 929         public SimpleList getPopupData () throws StorageObjectException {
 930                 return  null;
 931         }
 932
 933         /**
 934          *  Holt Daten fuer Popups.
 935          *  @param name  Name des Feldes.
 936          *  @param hasNullValue  Wenn true wird eine leerer  Eintrag fuer die Popups erzeugt.
 937          *  @return SimpleList Gibt freemarker.template.SimpleList zurueck.
 938          */
 939         public SimpleList getPopupData (String name, boolean hasNullValue)
 940                 throws StorageObjectException {
 941                 return  getPopupData(name, hasNullValue, null);
 942         }
 943
 944         /**
 945          *  Holt Daten fuer Popups.
 946          *  @param name  Name des Feldes.
 947          *  @param hasNullValue  Wenn true wird eine leerer  Eintrag fuer die Popups erzeugt.
 948          *  @param where  Schraenkt die Selektion der Datensaetze ein.
 949          *  @return SimpleList Gibt freemarker.template.SimpleList zurueck.
 950          */
 951         public SimpleList getPopupData (String name, boolean hasNullValue, String where) throws StorageObjectException {
 952          return  getPopupData(name, hasNullValue, where, null);
 953         }
 954
 955         /**
 956          *  Holt Daten fuer Popups.
 957          *  @param name  Name des Feldes.
 958          *  @param hasNullValue  Wenn true wird eine leerer  Eintrag fuer die Popups erzeugt.
 959          *  @param where  Schraenkt die Selektion der Datensaetze ein.
 960          *  @param order  Gibt ein Feld als Sortierkriterium an.
 961          *  @return SimpleList Gibt freemarker.template.SimpleList zurueck.
 962          */
 963         public SimpleList getPopupData (String name, boolean hasNullValue, String where, String order) throws StorageObjectException {
 964                 // caching
 965                 if (hasPopupCache && popupCache != null)
 966                         return  popupCache;
 967                 SimpleList simpleList = null;
 968                 Connection con = null;
 969                 Statement stmt = null;
 970                 // build sql
 971                 StringBuffer sql = new StringBuffer("select ").append(thePKeyName)
 972                                                                                                                                                                 .append(",").append(name).append(" from ")
 973                                                                                                                                                                 .append(theTable);
 974                 if (where != null && !(where.length() == 0))
 975                         sql.append(" where ").append(where);
 976                 sql.append(" order by ");
 977                 if (order != null && !(order.length() == 0))
 978                         sql.append(order);
 979                 else
 980                         sql.append(name);
 981                 // execute sql
 982                 try {
 983                         con = getPooledCon();
 984                 } catch (Exception e) {
 985                         throw new StorageObjectException(e.toString());
 986                 }
 987                 try {
 988                         stmt = con.createStatement();
 989                         ResultSet rs = executeSql(stmt, sql.toString());
 990
 991                         if (rs != null) {
 992                                 if (!evaluatedMetaData) get_meta_data();
 993                                 simpleList = new SimpleList();
 994                                 // if popup has null-selector
 995                                 if (hasNullValue) simpleList.add(POPUP_EMTYLINE);
 996
 997                                 SimpleHash popupDict;
 998                                 while (rs.next()) {
 999                                         popupDict = new SimpleHash();
1000                                         popupDict.put("key", getValueAsString(rs, 1, thePKeyType));
1001                                         popupDict.put("value", rs.getString(2));
1002                                         simpleList.add(popupDict);
1003                                 }
1004                                 rs.close();
1005                         }
1006                 } catch (Exception e) {
1007                         theLog.printError("getPopupData: "+e.toString());
1008                         throw new StorageObjectException(e.toString());
1009                 } finally {
1010                         freeConnection(con, stmt);
1011                 }
1012
1013                 if (hasPopupCache) popupCache = simpleList;
1014                 return  simpleList;
1015         }
1016
1017         /**
1018          * Liefert alle Daten der Tabelle als SimpleHash zurueck. Dies wird verwandt,
1019          * wenn in den Templates ein Lookup-Table benoetigt wird. Sollte nur bei kleinen
1020          * Tabellen Verwendung finden.
1021          * @return SimpleHash mit den Tabellezeilen.
1022          */
1023         public SimpleHash getHashData () {
1024                 /** @todo dangerous! this should have a flag to be enabled, otherwise
1025                  *  very big Hashes could be returned */
1026                 if (hashCache == null) {
1027                         try {
1028                                 hashCache = HTMLTemplateProcessor.makeSimpleHash(selectByWhereClause("",
1029                                                 -1));
1030                         } catch (StorageObjectException e) {
1031                                 theLog.printDebugInfo(e.toString());
1032                         }
1033                 }
1034                 return  hashCache;
1035         }
1036
1037         /* invalidates the popupCache
1038          */
1039         protected void invalidatePopupCache () {
1040                 /** @todo  invalidates toooo much */
1041                 popupCache = null;
1042                 hashCache = null;
1043         }
1044
1045         /**
1046          * Diese Methode fuehrt den Sqlstring <i>sql</i> aus und timed im Logfile.
1047          * @param stmt Statemnt
1048          * @param sql Sql-String
1049          * @return ResultSet
1050          * @exception StorageObjectException
1051          */
1052         public ResultSet executeSql (Statement stmt, String sql)
1053                 throws StorageObjectException, SQLException
1054         {
1055                 long startTime = System.currentTimeMillis();
1056                 ResultSet rs;
1057                 try {
1058                         rs = stmt.executeQuery(sql);
1059                         theLog.printInfo((System.currentTimeMillis() - startTime) + "ms. for: "
1060                                 + sql);
1061                 }
1062                 catch (SQLException e)
1063                 {
1064                         theLog.printDebugInfo("Failed: " + (System.currentTimeMillis()
1065                                                                                                                 - startTime) + "ms. for: "+ sql);
1066                         throw e;
1067                 }
1068
1069                 return  rs;
1070         }
1071
1072         /**
1073          * Fuehrt Statement stmt aus und liefert Resultset zurueck. Das SQL-Statment wird
1074          * getimed und geloggt.
1075          * @param stmt PreparedStatement mit der SQL-Anweisung
1076          * @return Liefert ResultSet des Statements zurueck.
1077          * @exception StorageObjectException, SQLException
1078          */
1079         public ResultSet executeSql (PreparedStatement stmt)
1080                 throws StorageObjectException, SQLException {
1081
1082                 long startTime = (new java.util.Date()).getTime();
1083                 ResultSet rs = stmt.executeQuery();
1084                 theLog.printInfo((new java.util.Date().getTime() - startTime) + "ms.");
1085                 return  rs;
1086         }
1087
1088                 /**
1089          * returns the number of rows in the table
1090          */
1091         public int getSize(String where)
1092                 throws SQLException,StorageObjectException
1093         {
1094                 long  startTime = System.currentTimeMillis();
1095                 String sql = "SELECT count(*) FROM "+ theTable + " where " + where;
1096                 Connection con = null;
1097                 Statement stmt = null;
1098                 int result = 0;
1099
1100                 try {
1101                         con = getPooledCon();
1102                         stmt = con.createStatement();
1103                         ResultSet rs = executeSql(stmt,sql);
1104                         while(rs.next()){
1105                                 result = rs.getInt(1);
1106                         }
1107                 } catch (SQLException e) {
1108                         theLog.printError(e.toString());
1109                 } finally {
1110                         freeConnection(con,stmt);
1111                 }
1112                 //theLog.printInfo(theTable + " has "+ result +" rows where " + where);
1113                 theLog.printInfo((System.currentTimeMillis() - startTime) + "ms. for: "
1114                                                                                 + sql);
1115                 return result;
1116         }
1117
1118         public int executeUpdate(Statement stmt, String sql)
1119                 throws StorageObjectException, SQLException
1120         {
1121                 int rs;
1122                 long  startTime = (new java.util.Date()).getTime();
1123                 try
1124                 {
1125                         rs = stmt.executeUpdate(sql);
1126                         theLog.printInfo((new java.util.Date().getTime() - startTime) + "ms. for: "
1127                                                                                                 + sql);
1128                 }
1129                 catch (SQLException e)
1130                 {
1131                         theLog.printDebugInfo("Failed: " + (new java.util.Date().getTime()
1132                                                                                                                 - startTime) + "ms. for: "+ sql);
1133                         throw e;
1134                 }
1135                 return rs;
1136         }
1137
1138         public int executeUpdate(String sql)
1139                 throws StorageObjectException, SQLException
1140         {
1141                 int result=-1;
1142                 long  startTime = (new java.util.Date()).getTime();
1143                 Connection con=null;PreparedStatement pstmt=null;
1144                 try {
1145                         con=getPooledCon();
1146                         pstmt = con.prepareStatement(sql);
1147                         result = pstmt.executeUpdate();
1148                 }
1149                 catch (Exception e) {
1150                         theLog.printDebugInfo("settimage :: setImage gescheitert: "+e.toString());
1151                         throw new StorageObjectException("executeUpdate failed: "+e.toString());
1152                 }
1153                 finally { freeConnection(con,pstmt); }
1154                 theLog.printInfo((new java.util.Date().getTime() - startTime) + "ms. for: "
1155                                                                                 + sql);
1156                 return result;
1157         }
1158
1159         /**
1160          * Wertet ResultSetMetaData aus und setzt interne Daten entsprechend
1161          * @param md ResultSetMetaData
1162          * @exception StorageObjectException
1163          */
1164         private void evalMetaData (ResultSetMetaData md)
1165                 throws StorageObjectException {
1166
1167                 this.evaluatedMetaData = true;
1168                 this.metadataFields = new ArrayList();
1169                 this.metadataLabels = new ArrayList();
1170                 this.metadataNotNullFields = new ArrayList();
1171                 try {
1172                         int numFields = md.getColumnCount();
1173                         this.metadataTypes = new int[numFields];
1174                         String aField;
1175                         int aType;
1176                         for (int i = 1; i <= numFields; i++) {
1177                                 aField = md.getColumnName(i);
1178                                 metadataFields.add(aField);
1179                                 metadataLabels.add(md.getColumnLabel(i));
1180                                 aType = md.getColumnType(i);
1181                                 metadataTypes[i - 1] = aType;
1182                                 if (aField.equals(thePKeyName)) {
1183                                         thePKeyType = aType; thePKeyIndex = i;
1184                                 }
1185                                 if (md.isNullable(i) == md.columnNullable) {
1186                                         metadataNotNullFields.add(aField);
1187                                 }
1188                         }
1189                 } catch (SQLException e) {
1190                         throwSQLException(e, "evalMetaData");
1191                 }
1192         }
1193
1194         /**
1195          *  Wertet die Metadaten eines Resultsets fuer eine Tabelle aus,
1196          *  um die alle Columns und Typen einer Tabelle zu ermitteln.
1197          */
1198         private void get_meta_data () throws StorageObjectException {
1199                 Connection con = null;
1200                 PreparedStatement pstmt = null;
1201                 String sql = "select * from " + theTable + " where 0=1";
1202                 try {
1203                         con = getPooledCon();
1204                         pstmt = con.prepareStatement(sql);
1205                         theLog.printInfo("METADATA: " + sql);
1206                         ResultSet rs = pstmt.executeQuery();
1207                         evalMetaData(rs.getMetaData());
1208                         rs.close();
1209                 } catch (SQLException e) {
1210                         throwSQLException(e, "get_meta_data");
1211                 } finally {
1212                         freeConnection(con, pstmt);
1213                 }
1214         }
1215
1216
1217         public Connection getPooledCon() throws StorageObjectException {
1218                 /* @todo , doublecheck but I'm pretty sure that this is unnecessary. -mh
1219                         try{
1220                         Class.forName("com.codestudio.sql.PoolMan").newInstance();
1221                 } catch (Exception e){
1222                         throw new StorageObjectException("Could not find the PoolMan Driver"
1223                                                                                                                                                                 +e.toString());
1224                 }*/
1225                 Connection con = null;
1226                 try{
1227                         con = SQLManager.getInstance().requestConnection();
1228                 } catch(SQLException e){
1229                         theLog.printError("could not connect to the database "+e.toString());
1230                         System.err.println("could not connect to the database "+e.toString());
1231                         throw new StorageObjectException("Could not connect to the database"+
1232                                                                                                                                                                 e.toString());
1233                 }
1234                 return con;
1235         }
1236
1237         public void freeConnection (Connection con, Statement stmt)
1238                 throws StorageObjectException {
1239                 SQLManager.getInstance().closeStatement(stmt);
1240                 SQLManager.getInstance().returnConnection(con);
1241         }
1242
1243         /**
1244          * Wertet SQLException aus und wirft dannach eine StorageObjectException
1245          * @param sqe SQLException
1246          * @param wo Funktonsname, in der die SQLException geworfen wurde
1247          * @exception StorageObjectException
1248          */
1249         protected void throwSQLException (SQLException sqe, String wo)
1250                 throws StorageObjectException {
1251                 String state = "";
1252                 String message = "";
1253                 int vendor = 0;
1254                 if (sqe != null) {
1255                         state = sqe.getSQLState();
1256                         message = sqe.getMessage();
1257                         vendor = sqe.getErrorCode();
1258                 }
1259                 theLog.printError(state + ": " + vendor + " : " + message + " Funktion: "
1260                                 + wo);
1261                 throw  new StorageObjectException((sqe == null) ? "undefined sql exception" :
1262                                 sqe.toString());
1263         }
1264
1265         protected void _throwStorageObjectException (Exception e, String wo)
1266                 throws StorageObjectException {
1267                 if (e != null) {
1268                                 theLog.printError(e.toString()+ wo);
1269                                 throw  new StorageObjectException(wo + e.toString());
1270                 } else {
1271                                 theLog.printError(wo);
1272                                 throw  new StorageObjectException(wo);
1273                 }
1274
1275         }
1276
1277         /**
1278          * Loggt Fehlermeldung mit dem Parameter Message und wirft dannach
1279          * eine StorageObjectException
1280          * @param message Nachricht mit dem Fehler
1281          * @exception StorageObjectException
1282          */
1283         void throwStorageObjectException (String message)
1284                 throws StorageObjectException {
1285                 _throwStorageObjectException(null, message);
1286         }
1287
1288 }
1289
1290
1291