source/mir/storage/Database.java

   1 /*
   2  * put your module comment here
   3  */
   4 package mir.storage;
   5
   6 import  java.sql.*;
   7 import  java.lang.*;
   8 import  java.io.*;
   9 import  java.util.*;
  10 import  freemarker.template.*;
  11 import  com.codestudio.sql.*;
  12 import  com.codestudio.util.*;
  13
  14 import  mir.storage.StorageObject;
  15 import  mir.storage.store.*;
  16 import  mir.entity.*;
  17 import  mir.misc.*;
  18
  19
  20 /**
  21  * Diese Klasse implementiert die Zugriffsschicht auf die Datenbank.
  22  * Alle Projektspezifischen Datenbankklassen erben von dieser Klasse.
  23  * In den Unterklassen wird im Minimalfall nur die Tabelle angegeben.
  24  * Im Konfigurationsfile findet sich eine Verweis auf den verwendeten
  25  * Treiber, Host, User und Passwort, ueber den der Zugriff auf die
  26  * Datenbank erfolgt.
  27  *
  28  * @author RK
  29  * @version 16.7.1999
  30  */
  31 public class Database implements StorageObject {
  32
  33         protected String                    theTable;
  34         protected String                    theCoreTable=null;
  35         protected String                    thePKeyName="id";
  36         protected int                       thePKeyType, thePKeyIndex;
  37         protected boolean                   evaluatedMetaData=false;
  38         protected ArrayList                 metadataFields,metadataLabels,
  39                                                                                                                                                         metadataNotNullFields;
  40         protected int[]                     metadataTypes;
  41         protected Class                     theEntityClass;
  42         protected StorageObject             myselfDatabase;
  43         protected SimpleList                popupCache=null;
  44         protected boolean                   hasPopupCache = false;
  45         protected SimpleHash                hashCache=null;
  46         protected boolean                   hasTimestamp=true;
  47         private String                      database_driver, database_url;
  48         private int                         defaultLimit;
  49         protected DatabaseAdaptor           theAdaptor;
  50         protected Logfile                   theLog;
  51         private static Class                GENERIC_ENTITY_CLASS=null,
  52                                       STORABLE_OBJECT_ENTITY_CLASS=null;
  53   private static SimpleHash           POPUP_EMTYLINE=new SimpleHash();
  54   protected static final ObjectStore  o_store=ObjectStore.getInstance();
  55
  56         static {
  57                 // always same object saves a little space
  58                 POPUP_EMTYLINE.put("key", ""); POPUP_EMTYLINE.put("value", "--");
  59     try {
  60       GENERIC_ENTITY_CLASS = Class.forName("mir.entity.GenericEntity");
  61       STORABLE_OBJECT_ENTITY_CLASS = Class.forName("mir.entity.StorableObjectEntity");
  62     }
  63     catch (Exception e) {
  64       System.err.println("FATAL: Database.java could not initialize" + e.toString());
  65     }
  66   }
  67
  68
  69         /**
  70          * Kontruktor bekommt den Filenamen des Konfigurationsfiles übergeben.
  71          * Aus diesem file werden <code>Database.Logfile</code>,
  72          * <code>Database.Username</code>,<code>Database.Password</code>,
  73          * <code>Database.Host</code> und <code>Database.Adaptor</code>
  74          * ausgelesen und ein Broker für die Verbindugen zur Datenbank
  75          * erzeugt.
  76          *
  77          * @param   String confFilename Dateiname der Konfigurationsdatei
  78          */
  79         public Database() throws StorageObjectException {
  80                 theLog = Logfile.getInstance(MirConfig.getProp("Home")+
  81                                                                                                                                 MirConfig.getProp("Database.Logfile"));
  82                 String theAdaptorName=MirConfig.getProp("Database.Adaptor");
  83                 defaultLimit = Integer.parseInt(MirConfig.getProp("Database.Limit"));
  84                 try {
  85                         theEntityClass = GENERIC_ENTITY_CLASS;
  86                         theAdaptor = (DatabaseAdaptor)Class.forName(theAdaptorName).newInstance();
  87                 } catch (Exception e){
  88                         theLog.printError("Error in Database() constructor with "+
  89                                                                                                 theAdaptorName + " -- " +e.toString());
  90                         throw new StorageObjectException("Error in Database() constructor with "
  91                                                                                                                                                          +e.toString());
  92                 }
  93                 /*String database_username=MirConfig.getProp("Database.Username");
  94                 String database_password=MirConfig.getProp("Database.Password");
  95                 String database_host=MirConfig.getProp("Database.Host");
  96                 try {
  97                         database_driver=theAdaptor.getDriver();
  98                         database_url=theAdaptor.getURL(database_username,database_password,
  99                                                                                                                                                 database_host);
 100                         theLog.printDebugInfo("adding Broker with: " +database_driver+":"+
 101                                                                                                                 database_url  );
 102                         MirConfig.addBroker(database_driver,database_url);
 103                         //myBroker=MirConfig.getBroker();
 104                 }*/
 105         }
 106
 107         /**
 108          * Liefert die Entity-Klasse zurück, in der eine Datenbankzeile gewrappt
 109          * wird. Wird die Entity-Klasse durch die erbende Klasse nicht überschrieben,
 110          * wird eine mir.entity.GenericEntity erzeugt.
 111          *
 112          * @return Class-Objekt der Entity
 113          */
 114         public java.lang.Class getEntityClass () {
 115                 return  theEntityClass;
 116         }
 117
 118         /**
 119          * Liefert die Standardbeschränkung von select-Statements zurück, also
 120          * wieviel Datensätze per Default selektiert werden.
 121          *
 122          * @return Standard-Anzahl der Datensätze
 123          */
 124         public int getLimit () {
 125                 return  defaultLimit;
 126         }
 127
 128         /**
 129          * Liefert den Namen des Primary-Keys zurück. Wird die Variable nicht von
 130          * der erbenden Klasse überschrieben, so ist der Wert <code>PKEY</code>
 131          * @return Name des Primary-Keys
 132          */
 133         public String getIdName () {
 134                 return  thePKeyName;
 135         }
 136
 137         /**
 138          * Liefert den Namen der Tabelle, auf das sich das Datenbankobjekt bezieht.
 139          *
 140          * @return Name der Tabelle
 141          */
 142         public String getTableName () {
 143                 return  theTable;
 144         }
 145
 146         /*
 147          *   Dient dazu vererbte Tabellen bei objectrelationalen DBMS
 148          *   zu speichern, wenn die id einer Tabelle in der parenttabelle verwaltet
 149          *   wird.
 150          *   @return liefert theCoreTabel als String zurueck, wenn gesetzt, sonst
 151          *    the Table
 152          */
 153
 154         public String getCoreTable(){
 155                 if (theCoreTable!=null) return theCoreTable;
 156                 else return theTable;
 157         }
 158
 159         /**
 160          * Liefert Feldtypen der Felder der Tabelle zurueck (s.a. java.sql.Types)
 161          * @return int-Array mit den Typen der Felder
 162          * @exception StorageObjectException
 163          */
 164         public int[] getTypes () throws StorageObjectException {
 165                 if (metadataTypes == null)
 166                         get_meta_data();
 167                 return  metadataTypes;
 168         }
 169
 170         /**
 171          * Liefert eine Liste der Labels der Tabellenfelder
 172          * @return ArrayListe mit Labeln
 173          * @exception StorageObjectException
 174          */
 175         public ArrayList getLabels () throws StorageObjectException {
 176                 if (metadataLabels == null)
 177                         get_meta_data();
 178                 return  metadataLabels;
 179         }
 180
 181         /**
 182          * Liefert eine Liste der Felder der Tabelle
 183          * @return ArrayList mit Feldern
 184          * @exception StorageObjectException
 185          */
 186         public ArrayList getFields () throws StorageObjectException {
 187                 if (metadataFields == null)
 188                         get_meta_data();
 189                 return  metadataFields;
 190         }
 191
 192
 193         /*
 194          *   Gets value out of ResultSet according to type and converts to String
 195          *   @param inValue  Wert aus ResultSet.
 196          *   @param aType  Datenbanktyp.
 197          *   @return liefert den Wert als String zurueck. Wenn keine Umwandlung moeglich
 198          *           dann /unsupported value/
 199          */
 200         private String getValueAsString (ResultSet rs, int valueIndex, int aType) throws StorageObjectException {
 201                 String outValue = null;
 202                 if (rs != null) {
 203                         try {
 204                                 switch (aType) {
 205                                         case java.sql.Types.BIT:
 206                                                 outValue = (rs.getBoolean(valueIndex) == true) ? "1" : "0";
 207                                                 break;
 208                                         case java.sql.Types.INTEGER:case java.sql.Types.SMALLINT:case java.sql.Types.TINYINT:case java.sql.Types.BIGINT:
 209                                                 int out = rs.getInt(valueIndex);
 210                                                 if (!rs.wasNull())
 211                                                         outValue = new Integer(out).toString();
 212                                                 break;
 213                                         case java.sql.Types.NUMERIC:
 214             /** @todo Numeric can be float or double depending upon
 215              *  metadata.getScale() / especially with oracle */
 216                                                 long outl = rs.getLong(valueIndex);
 217                                                 if (!rs.wasNull())
 218                                                         outValue = new Long(outl).toString();
 219                                                 break;
 220                                         case java.sql.Types.REAL:
 221                                                 float tempf = rs.getFloat(valueIndex);
 222                                                 if (!rs.wasNull()) {
 223                                                         tempf *= 10;
 224                                                         tempf += 0.5;
 225                                                         int tempf_int = (int)tempf;
 226                                                         tempf = (float)tempf_int;
 227                                                         tempf /= 10;
 228                                                         outValue = "" + tempf;
 229                                                         outValue = outValue.replace('.', ',');
 230                                                 }
 231                                                 break;
 232                                         case java.sql.Types.DOUBLE:
 233                                                 double tempd = rs.getDouble(valueIndex);
 234                                                 if (!rs.wasNull()) {
 235                                                         tempd *= 10;
 236                                                         tempd += 0.5;
 237                                                         int tempd_int = (int)tempd;
 238                                                         tempd = (double)tempd_int;
 239                                                         tempd /= 10;
 240                                                         outValue = "" + tempd;
 241                                                         outValue = outValue.replace('.', ',');
 242                                                 }
 243                                                 break;
 244                                         case java.sql.Types.CHAR:case java.sql.Types.VARCHAR:case java.sql.Types.LONGVARCHAR:
 245                                                 outValue = rs.getString(valueIndex);
 246                                                 //if (outValue != null)
 247                                                         //outValue = StringUtil.encodeHtml(StringUtil.unquote(outValue));
 248                                                 break;
 249                                         case java.sql.Types.LONGVARBINARY:
 250                                                 outValue = rs.getString(valueIndex);
 251                                                 //if (outValue != null)
 252                                                         //outValue = StringUtil.encodeHtml(StringUtil.unquote(outValue));
 253                                                 break;
 254                                         case java.sql.Types.TIMESTAMP:
 255                                                 Timestamp timestamp = (rs.getTimestamp(valueIndex));
 256                                                 if (!rs.wasNull()) {
 257                                                         outValue = timestamp.toString();
 258                                                 }
 259                                                 break;
 260                                         default:
 261                                                 outValue = "<unsupported value>";
 262                                                 theLog.printWarning("Unsupported Datatype: at " + valueIndex +
 263                                                                 " (" + aType + ")");
 264                                 }
 265                         } catch (SQLException e) {
 266                                 throw  new StorageObjectException("Could not get Value out of Resultset -- "
 267                                                 + e.toString());
 268                         }
 269                 }
 270                 return  outValue;
 271         }
 272
 273         /*
 274          *   select-Operator um einen Datensatz zu bekommen.
 275          *   @param id Primaerschluessel des Datensatzes.
 276          *   @return liefert EntityObject des gefundenen Datensatzes oder null.
 277          */
 278         public Entity selectById(String id)     throws StorageObjectException
 279   {
 280                 if (id==null||id.equals(""))
 281                         throw new StorageObjectException("id war null");
 282
 283     // ask object store for object
 284     if ( StoreUtil.implementsStorableObject(theEntityClass) ) {
 285       String uniqueId = id;
 286       if ( theEntityClass.equals(StorableObjectEntity.class) )
 287         uniqueId+="@"+theTable;
 288       StoreIdentifier search_sid = new StoreIdentifier(theEntityClass, uniqueId);
 289       theLog.printDebugInfo("CACHE: (dbg) looking for sid " + search_sid.toString());
 290       Entity hit = (Entity)o_store.use(search_sid);
 291       if ( hit!=null ) return hit;
 292     }
 293
 294                 Statement stmt=null;Connection con=getPooledCon();
 295                 Entity returnEntity=null;
 296                 try {
 297                         ResultSet rs;
 298                         /** @todo better prepared statement */
 299                         String selectSql = "select * from " + theTable + " where " + thePKeyName + "=" + id;
 300                         stmt = con.createStatement();
 301                         rs = executeSql(stmt, selectSql);
 302                         if (rs != null) {
 303                                 if (evaluatedMetaData==false) evalMetaData(rs.getMetaData());
 304                                 if (rs.next())
 305                                         returnEntity = makeEntityFromResultSet(rs);
 306                                 else theLog.printDebugInfo("Keine daten fuer id: " + id + "in Tabelle" + theTable);
 307                                 rs.close();
 308                         }
 309                         else {
 310                                 theLog.printDebugInfo("No Data for Id " + id + " in Table " + theTable);
 311                         }
 312                 }
 313                 catch (SQLException sqe){
 314                         throwSQLException(sqe,"selectById"); return null;
 315                 }
 316                 catch (NumberFormatException e) {
 317                         theLog.printError("ID ist keine Zahl: " + id);
 318                 }
 319                 finally { freeConnection(con,stmt); }
 320
 321                 /** @todo OS: Entity should be saved in ostore */
 322                 return returnEntity;
 323         }
 324
 325
 326         /**
 327          *   select-Operator um Datensaetze zu bekommen, die key = value erfuellen.
 328          *   @param key  Datenbankfeld der Bedingung.
 329          *   @param value  Wert die der key anehmen muss.
 330          *   @return EntityList mit den gematchten Entities
 331          */
 332         public EntityList selectByFieldValue(String aField, String aValue)
 333                 throws StorageObjectException
 334         {
 335                 return selectByFieldValue(aField, aValue, 0);
 336         }
 337
 338         /**
 339          *   select-Operator um Datensaetze zu bekommen, die key = value erfuellen.
 340          *   @param key  Datenbankfeld der Bedingung.
 341          *   @param value  Wert die der key anehmen muss.
 342          *   @param offset  Gibt an ab welchem Datensatz angezeigt werden soll.
 343          *   @return EntityList mit den gematchten Entities
 344          */
 345         public EntityList selectByFieldValue(String aField, String aValue, int offset)
 346                 throws StorageObjectException
 347         {
 348                 return selectByWhereClause(aField + "=" + aValue, offset);
 349         }
 350
 351
 352         /**
 353          * select-Operator liefert eine EntityListe mit den gematchten Datensätzen zurück.
 354          * Also offset wird der erste Datensatz genommen.
 355          *
 356          * @param wc where-Clause
 357          * @return EntityList mit den gematchten Entities
 358          * @exception StorageObjectException
 359          */
 360         public EntityList selectByWhereClause(String where)
 361                 throws StorageObjectException
 362         {
 363                 return selectByWhereClause(where, 0);
 364         }
 365
 366
 367         /**
 368          * select-Operator liefert eine EntityListe mit den gematchten Datensätzen zurück.
 369          * Als maximale Anzahl wird das Limit auf der Konfiguration genommen.
 370          *
 371          * @param wc where-Clause
 372          * @param offset ab welchem Datensatz.
 373          * @return EntityList mit den gematchten Entities
 374          * @exception StorageObjectException
 375          */
 376         public EntityList selectByWhereClause(String whereClause, int offset)
 377                 throws StorageObjectException
 378         {
 379                 return selectByWhereClause(whereClause, null, offset);
 380         }
 381
 382
 383         /**
 384          * select-Operator liefert eine EntityListe mit den gematchten Datensätzen zurück.
 385          * Also offset wird der erste Datensatz genommen.
 386          * Als maximale Anzahl wird das Limit auf der Konfiguration genommen.
 387          *
 388          * @param wc where-Clause
 389          * @param ob orderBy-Clause
 390          * @return EntityList mit den gematchten Entities
 391          * @exception StorageObjectException
 392          */
 393
 394         public EntityList selectByWhereClause(String where, String order)
 395                 throws StorageObjectException {
 396                 return selectByWhereClause(where, order, 0);
 397         }
 398
 399
 400         /**
 401          * select-Operator liefert eine EntityListe mit den gematchten Datensätzen zurück.
 402          * Als maximale Anzahl wird das Limit auf der Konfiguration genommen.
 403          *
 404          * @param wc where-Clause
 405          * @param ob orderBy-Clause
 406          * @param offset ab welchem Datensatz
 407          * @return EntityList mit den gematchten Entities
 408          * @exception StorageObjectException
 409          */
 410
 411         public EntityList selectByWhereClause(String whereClause, String orderBy, int offset)
 412                 throws StorageObjectException {
 413                 return selectByWhereClause(whereClause, orderBy, offset, defaultLimit);
 414         }
 415
 416
 417         /**
 418          * select-Operator liefert eine EntityListe mit den gematchten Datensätzen zurück.
 419          * @param wc where-Clause
 420          * @param ob orderBy-Clause
 421          * @param offset ab welchem Datensatz
 422          * @param limit wieviele Datensätze
 423          * @return EntityList mit den gematchten Entities
 424          * @exception StorageObjectException
 425          */
 426
 427         public EntityList selectByWhereClause(String wc, String ob, int offset, int limit)
 428                 throws StorageObjectException
 429   {
 430
 431     // check o_store for entitylist
 432     if ( StoreUtil.implementsStorableObject(theEntityClass) ) {
 433       StoreIdentifier search_sid =
 434         new StoreIdentifier( theEntityClass,
 435                              StoreContainerType.STOC_TYPE_ENTITYLIST,
 436                              StoreUtil.getEntityListUniqueIdentifierFor(wc,ob,offset,limit) );
 437       EntityList hit = (EntityList)o_store.use(search_sid);
 438       if ( hit!=null ) {
 439         theLog.printDebugInfo("CACHE (hit): " + search_sid.toString());
 440         return hit;
 441       }
 442     }
 443
 444                 // local
 445                 EntityList    theReturnList=null;
 446                 Connection    con=null; Statement stmt=null;
 447                 ResultSet     rs;
 448                 int           offsetCount = 0, count=0;
 449
 450                 // build sql-statement
 451
 452                 /** @todo count sql string should only be assembled if we really count
 453                  *  see below at the end of method //rk */
 454
 455                 if (wc != null && wc.length() == 0) {
 456                         wc = null;
 457                 }
 458                 StringBuffer countSql = new StringBuffer("select count(*) from ").append(theTable);
 459                 StringBuffer selectSql = new StringBuffer("select * from ").append(theTable);
 460                 if (wc != null) {
 461                         selectSql.append(" where ").append(wc);
 462                         countSql.append(" where ").append(wc);
 463                 }
 464                 if (ob != null && !(ob.length() == 0)) {
 465                         selectSql.append(" order by ").append(ob);
 466                 }
 467                 if (theAdaptor.hasLimit()) {
 468                         if (limit > -1 && offset > -1) {
 469                                 selectSql.append(" limit ");
 470                                 if (theAdaptor.reverseLimit()) {
 471                                         selectSql.append(limit).append(",").append(offset);
 472                                 }
 473                                 else {
 474                                         selectSql.append(offset).append(",").append(limit);
 475                                 }
 476                         }
 477                 }
 478
 479                 // execute sql
 480                 try {
 481                         con = getPooledCon();
 482                         stmt = con.createStatement();
 483
 484                         // selecting...
 485                         rs = executeSql(stmt, selectSql.toString());
 486                         if (rs != null) {
 487                                 if (!evaluatedMetaData) evalMetaData(rs.getMetaData());
 488
 489                                 theReturnList = new EntityList();
 490                                 Entity theResultEntity;
 491                                 while (rs.next()) {
 492                                         theResultEntity = makeEntityFromResultSet(rs);
 493                                         theReturnList.add(theResultEntity);
 494                                         offsetCount++;
 495                                 }
 496                                 rs.close();
 497                         }
 498
 499                         // making entitylist infos
 500                         if (!(theAdaptor.hasLimit())) count = offsetCount;
 501
 502                         if (theReturnList != null) {
 503                                 // now we decide if we have to know an overall count...
 504                                 count=offsetCount;
 505                                 if (limit > -1 && offset > -1) {
 506                                         if (offsetCount==limit) {
 507                                                 /** @todo counting should be deffered to entitylist
 508                                                  *  getSize() should be used */
 509                                                 rs = executeSql(stmt, countSql.toString());
 510                                                 if (rs != null) {
 511                                                         if ( rs.next() ) count = rs.getInt(1);
 512                                                         rs.close();
 513                                                 }
 514                                                 else theLog.printError("Could not count: " + countSql);
 515                                         }
 516                                 }
 517                                 theReturnList.setCount(count);
 518                                 theReturnList.setOffset(offset);
 519                                 theReturnList.setWhere(wc);
 520                                 theReturnList.setOrder(ob);
 521         theReturnList.setEntityClass(theEntityClass);
 522         theReturnList.setLimit(limit);
 523                                 if ( offset >= limit )
 524                                         theReturnList.setPrevBatch(offset - limit);
 525                                 if ( offset+offsetCount < count )
 526                                         theReturnList.setNextBatch(offset + limit);
 527         if ( StoreUtil.implementsStorableObject(theEntityClass) ) {
 528           StoreIdentifier sid=theReturnList.getStoreIdentifier();
 529           theLog.printDebugInfo("CACHE (add): " + sid.toString());
 530           o_store.add(sid);
 531         }
 532                         }
 533                 }
 534                 catch (SQLException sqe) { throwSQLException(sqe, "selectByWhereClause"); }
 535                 finally { freeConnection(con, stmt); }
 536
 537                 return  theReturnList;
 538         }
 539
 540
 541         /**
 542          *  Bastelt aus einer Zeile der Datenbank ein EntityObjekt.
 543          *
 544          *  @param rs Das ResultSetObjekt.
 545          *  @return Entity Die Entity.
 546          */
 547         private Entity makeEntityFromResultSet (ResultSet rs)
 548                 throws StorageObjectException
 549         {
 550                 /** @todo OS: get Pkey from ResultSet and consult ObjectStore */
 551                 HashMap theResultHash = new HashMap();
 552                 String theResult = null;
 553                 int theType;
 554                 Entity returnEntity = null;
 555                 try {
 556                         int size = metadataFields.size();
 557                         for (int i = 0; i < size; i++) {
 558                                 // alle durchlaufen bis nix mehr da
 559                                 theType = metadataTypes[i];
 560                                 if (theType == java.sql.Types.LONGVARBINARY) {
 561                                         InputStream us = rs.getAsciiStream(i + 1);
 562                                         if (us != null) {
 563                                                 InputStreamReader is = new InputStreamReader(us);
 564                                                 char[] data = new char[32768];
 565                                                 StringBuffer theResultString = new StringBuffer();
 566                                                 int len;
 567                                                 while ((len = is.read(data)) > 0) {
 568                                                         theResultString.append(data, 0, len);
 569                                                 }
 570                                                 is.close();
 571                                                 theResult = theResultString.toString();
 572                                         }
 573                                         else {
 574                                                 theResult = null;
 575                                         }
 576                                 }
 577                                 else {
 578                                         theResult = getValueAsString(rs, (i + 1), theType);
 579                                 }
 580                                 if (theResult != null) {
 581                                         theResultHash.put(metadataFields.get(i), theResult);
 582                                 }
 583                         }
 584       if (theEntityClass != null) {
 585         returnEntity = (Entity)theEntityClass.newInstance();
 586         returnEntity.setValues(theResultHash);
 587         returnEntity.setStorage(myselfDatabase);
 588         if ( returnEntity instanceof StorableObject ) {
 589           theLog.printDebugInfo("CACHE: ( in) " + returnEntity.getId() + " :"+theTable);
 590           o_store.add(((StorableObject)returnEntity).getStoreIdentifier());
 591         }
 592       } else {
 593         throwStorageObjectException("Internal Error: theEntityClass not set!");
 594       }
 595                 } catch (IllegalAccessException e) {
 596                         throwStorageObjectException("Kein Zugriff! -- " + e.toString());
 597                 } catch (IOException e) {
 598                         throwStorageObjectException("IOException! -- " + e.toString());
 599                 } catch (InstantiationException e) {
 600                         throwStorageObjectException("Keine Instantiiierung! -- " + e.toString());
 601                 } catch (SQLException sqe) {
 602                         throwSQLException(sqe, "makeEntityFromResultSet");
 603                         return  null;
 604                 }
 605                 return  returnEntity;
 606         }
 607
 608         /**
 609          * insert-Operator: fügt eine Entity in die Tabelle ein. Eine Spalte WEBDB_CREATE
 610          * wird automatisch mit dem aktuellen Datum gefuellt.
 611          *
 612          * @param theEntity
 613          * @return der Wert des Primary-keys der eingefügten Entity
 614          */
 615         public String insert (Entity theEntity) throws StorageObjectException {
 616                 String returnId = null;
 617                 Connection con = null;
 618                 PreparedStatement pstmt = null;
 619                 //cache
 620                 invalidatePopupCache();
 621                 /** @todo OS: if Entity is StorableObject, invalidate in ObjectStore
 622                  *  careful: Entity has no id yet! */
 623                 try {
 624                         ArrayList streamedInput = theEntity.streamedInput();
 625                         StringBuffer f = new StringBuffer();
 626                         StringBuffer v = new StringBuffer();
 627                         String aField, aValue;
 628                         boolean firstField = true;
 629                         // make sql-string
 630                         for (int i = 0; i < getFields().size(); i++) {
 631                                 aField = (String)getFields().get(i);
 632                                 if (!aField.equals(thePKeyName)) {
 633                                         aValue = null;
 634                                         // sonderfaelle
 635                                         if (aField.equals("webdb_create")) {
 636                                                 aValue = "NOW()";
 637                                         }
 638                                         else {
 639                                                 if (streamedInput != null && streamedInput.contains(aField)) {
 640                                                         aValue = "?";
 641                                                 }
 642                                                 else {
 643                                                         if (theEntity.hasValueForField(aField)) {
 644                                                                 aValue = "'" + StringUtil.quote((String)theEntity.getValue(aField))
 645                                                                                 + "'";
 646                                                         }
 647                                                 }
 648                                         }
 649                                         // wenn Wert gegeben, dann einbauen
 650                                         if (aValue != null) {
 651                                                 if (firstField == false) {
 652                                                         f.append(",");
 653                                                         v.append(",");
 654                                                 }
 655                                                 else {
 656                                                         firstField = false;
 657                                                 }
 658                                                 f.append(aField);
 659                                                 v.append(aValue);
 660                                         }
 661                                 }
 662                         }         // end for
 663                         // insert into db
 664                         StringBuffer sqlBuf = new StringBuffer("insert into ").append(theTable).append("(").append(f).append(") values (").append(v).append(")");
 665                         String sql = sqlBuf.toString();
 666                         theLog.printInfo("INSERT: " + sql);
 667                         con = getPooledCon();
 668                         con.setAutoCommit(false);
 669                         pstmt = con.prepareStatement(sql);
 670                         if (streamedInput != null) {
 671                                 for (int i = 0; i < streamedInput.size(); i++) {
 672                                         String inputString = (String)theEntity.getValue((String)streamedInput.get(i));
 673                                         pstmt.setBytes(i + 1, inputString.getBytes());
 674                                 }
 675                         }
 676                         int ret = pstmt.executeUpdate();
 677                         if(ret == 0){
 678                                 //insert failed
 679                                 return null;
 680                         }
 681                         pstmt = con.prepareStatement(theAdaptor.getLastInsertSQL((Database)myselfDatabase));
 682                         ResultSet rs = pstmt.executeQuery();
 683                         rs.next();
 684                         returnId = rs.getString(1);
 685                         theEntity.setId(returnId);
 686                 } catch (SQLException sqe) {
 687                         throwSQLException(sqe, "insert");
 688                 } finally {
 689                         try {
 690                                 con.setAutoCommit(true);
 691                         } catch (Exception e) {
 692                                 ;
 693                         }
 694                         freeConnection(con, pstmt);
 695                 }
 696                 return  returnId;
 697         }
 698
 699         /**
 700          * update-Operator: aktualisiert eine Entity. Eine Spalte WEBDB_LASTCHANGE
 701          * wird automatisch mit dem aktuellen Datum gefuellt.
 702          *
 703          * @param theEntity
 704          */
 705         public void update (Entity theEntity) throws StorageObjectException
 706   {
 707                 Connection con = null; PreparedStatement pstmt = null;
 708                 /** @todo this is stupid: why do we prepare statement, when we
 709                  *  throw it away afterwards. should be regular statement
 710                  *  update/insert could better be one routine called save()
 711                  *  that chooses to either insert or update depending if we
 712                  *  have a primary key in the entity. i don't know if we
 713                  *  still need the streamed input fields. // rk  */
 714
 715                 /** @todo extension: check if Entity did change, otherwise we don't need */
 716                 /** @todo OS: invalidate in Ostore if Entity is StorableObject */
 717
 718                 ArrayList streamedInput = theEntity.streamedInput();
 719                 String id = theEntity.getId();
 720                 String aField;
 721                 StringBuffer fv = new StringBuffer();
 722                 boolean firstField = true;
 723                 //cache
 724                 invalidatePopupCache();
 725                 // build sql statement
 726                 for (int i = 0; i < getFields().size(); i++) {
 727                         aField = (String)metadataFields.get(i);
 728                         // only normal cases
 729                         if (!(aField.equals(thePKeyName) || aField.equals("webdb_create") ||
 730                                         aField.equals("webdb_lastchange") || (streamedInput != null && streamedInput.contains(aField)))) {
 731                                 if (theEntity.hasValueForField(aField)) {
 732                                         if (firstField == false) {
 733                                                 fv.append(", ");
 734                                         }
 735                                         else {
 736                                                 firstField = false;
 737                                         }
 738                                         fv.append(aField).append("='").append(StringUtil.quote((String)theEntity.getValue(aField))).append("'");
 739                                 }
 740                         }
 741                 }
 742                 StringBuffer sql = new StringBuffer("update ").append(theTable).append(" set ").append(fv);
 743                 // exceptions
 744                 if (metadataFields.contains("webdb_lastchange")) {
 745                         sql.append(",webdb_lastchange=NOW()");
 746                 }
 747                 if (streamedInput != null) {
 748                         for (int i = 0; i < streamedInput.size(); i++) {
 749                                 sql.append(",").append(streamedInput.get(i)).append("=?");
 750                         }
 751                 }
 752                 sql.append(" where id=").append(id);
 753                 theLog.printInfo("UPDATE: " + sql);
 754                 // execute sql
 755                 try {
 756                         con = getPooledCon();
 757                         con.setAutoCommit(false);
 758                         pstmt = con.prepareStatement(sql.toString());
 759                         if (streamedInput != null) {
 760                                 for (int i = 0; i < streamedInput.size(); i++) {
 761                                         String inputString = theEntity.getValue((String)streamedInput.get(i));
 762                                         pstmt.setBytes(i + 1, inputString.getBytes());
 763                                 }
 764                         }
 765                         pstmt.executeUpdate();
 766                 } catch (SQLException sqe) {
 767                         throwSQLException(sqe, "update");
 768                 } finally {
 769                         try {
 770                                 con.setAutoCommit(true);
 771                         } catch (Exception e) {
 772                                 ;
 773                         }
 774                         freeConnection(con, pstmt);
 775                 }
 776         }
 777
 778         /*
 779          *   delete-Operator
 780          *   @param id des zu loeschenden Datensatzes
 781          *   @return boolean liefert true zurueck, wenn loeschen erfolgreich war.
 782          */
 783         public boolean delete (String id) throws StorageObjectException {
 784
 785                 invalidatePopupCache();
 786     // ostore send notification
 787     if (StoreUtil.implementsStorableObject(theEntityClass) ) {
 788                         theLog.printInfo("CACHE: (del) " + id);
 789                         StoreIdentifier search_sid =
 790         new StoreIdentifier(theEntityClass, StoreContainerType.STOC_TYPE_ENTITY, id);
 791       o_store.invalidate(search_sid);
 792                 }
 793
 794                 /** @todo could be prepared Statement */
 795                 Statement stmt = null; Connection con = null;
 796                 int res = 0;
 797                 String sql="delete from "+theTable+" where "+thePKeyName+"='"+id+"'";
 798                 theLog.printInfo("DELETE " + sql);
 799                 try {
 800                         con = getPooledCon(); stmt = con.createStatement();
 801                         res = stmt.executeUpdate(sql);
 802                 }
 803     catch (SQLException sqe) { throwSQLException(sqe, "delete"); }
 804     finally { freeConnection(con, stmt); }
 805
 806                 return  (res > 0) ? true : false;
 807         }
 808
 809         /* noch nicht implementiert.
 810          * @return immer false
 811          */
 812         public boolean delete (EntityList theEntityList) {
 813                 invalidatePopupCache();
 814                 return  false;
 815         }
 816
 817         /**
 818          * Diese Methode sollte ueberschrieben werden, wenn fuer die abgeleitete Database-Klasse
 819          * eine SimpleList mit Standard-Popupdaten erzeugt werden koennen soll.
 820          * @return null
 821          */
 822         public SimpleList getPopupData () throws StorageObjectException {
 823                 return  null;
 824         }
 825
 826         /**
 827          *  Holt Daten fuer Popups.
 828          *  @param name  Name des Feldes.
 829          *  @param hasNullValue  Wenn true wird eine leerer  Eintrag fuer die Popups erzeugt.
 830          *  @return SimpleList Gibt freemarker.template.SimpleList zurueck.
 831          */
 832         public SimpleList getPopupData (String name, boolean hasNullValue)
 833                 throws StorageObjectException {
 834                 return  getPopupData(name, hasNullValue, null);
 835         }
 836
 837         /**
 838          *  Holt Daten fuer Popups.
 839          *  @param name  Name des Feldes.
 840          *  @param hasNullValue  Wenn true wird eine leerer  Eintrag fuer die Popups erzeugt.
 841          *  @param where  Schraenkt die Selektion der Datensaetze ein.
 842          *  @return SimpleList Gibt freemarker.template.SimpleList zurueck.
 843          */
 844         public SimpleList getPopupData (String name, boolean hasNullValue, String where) throws StorageObjectException {
 845          return  getPopupData(name, hasNullValue, where, null);
 846         }
 847
 848         /**
 849          *  Holt Daten fuer Popups.
 850          *  @param name  Name des Feldes.
 851          *  @param hasNullValue  Wenn true wird eine leerer  Eintrag fuer die Popups erzeugt.
 852          *  @param where  Schraenkt die Selektion der Datensaetze ein.
 853          *  @param order  Gibt ein Feld als Sortierkriterium an.
 854          *  @return SimpleList Gibt freemarker.template.SimpleList zurueck.
 855          */
 856         public SimpleList getPopupData (String name, boolean hasNullValue, String where, String order) throws StorageObjectException {
 857                 // caching
 858                 if (hasPopupCache && popupCache != null)
 859                         return  popupCache;
 860                 SimpleList simpleList = null;
 861                 Connection con = null;
 862                 Statement stmt = null;
 863                 // build sql
 864                 StringBuffer sql = new StringBuffer("select ").append(thePKeyName)
 865                                                                                                                                                                 .append(",").append(name).append(" from ")
 866                                                                                                                                                                 .append(theTable);
 867                 if (where != null && !(where.length() == 0))
 868                         sql.append(" where ").append(where);
 869                 sql.append(" order by ");
 870                 if (order != null && !(order.length() == 0))
 871                         sql.append(order);
 872                 else
 873                         sql.append(name);
 874                 // execute sql
 875                 try {
 876                         con = getPooledCon();
 877                 } catch (Exception e) {
 878                         throw new StorageObjectException(e.toString());
 879                 }
 880                 try {
 881                         stmt = con.createStatement();
 882                         ResultSet rs = executeSql(stmt, sql.toString());
 883
 884                         if (rs != null) {
 885                                 if (!evaluatedMetaData) get_meta_data();
 886                                 simpleList = new SimpleList();
 887                                 // if popup has null-selector
 888                                 if (hasNullValue) simpleList.add(POPUP_EMTYLINE);
 889
 890                                 SimpleHash popupDict;
 891                                 while (rs.next()) {
 892                                         popupDict = new SimpleHash();
 893                                         popupDict.put("key", getValueAsString(rs, 1, thePKeyType));
 894                                         popupDict.put("value", rs.getString(2));
 895                                         simpleList.add(popupDict);
 896                                 }
 897                                 rs.close();
 898                         }
 899                 } catch (Exception e) {
 900                         theLog.printError("getPopupData: "+e.toString());
 901                         throw new StorageObjectException(e.toString());
 902                 } finally {
 903                         freeConnection(con, stmt);
 904                 }
 905
 906                 if (hasPopupCache) popupCache = simpleList;
 907                 return  simpleList;
 908         }
 909
 910         /**
 911          * Liefert alle Daten der Tabelle als SimpleHash zurueck. Dies wird verwandt,
 912          * wenn in den Templates ein Lookup-Table benoetigt wird. Sollte nur bei kleinen
 913          * Tabellen Verwendung finden.
 914          * @return SimpleHash mit den Tabellezeilen.
 915          */
 916         public SimpleHash getHashData () {
 917                 /** @todo dangerous! this should have a flag to be enabled, otherwise
 918                  *  very big Hashes could be returned */
 919                 if (hashCache == null) {
 920                         try {
 921                                 hashCache = HTMLTemplateProcessor.makeSimpleHash(selectByWhereClause("",
 922                                                 -1));
 923                         } catch (StorageObjectException e) {
 924                                 theLog.printDebugInfo(e.toString());
 925                         }
 926                 }
 927                 return  hashCache;
 928         }
 929
 930         /* invalidates the popupCache
 931          */
 932         protected void invalidatePopupCache () {
 933                 /** @todo  invalidates toooo much */
 934                 popupCache = null;
 935                 hashCache = null;
 936         }
 937
 938         /**
 939          * Diese Methode fuehrt den Sqlstring <i>sql</i> aus und timed im Logfile.
 940          * @param stmt Statemnt
 941          * @param sql Sql-String
 942          * @return ResultSet
 943          * @exception StorageObjectException
 944          */
 945         public ResultSet executeSql (Statement stmt, String sql)
 946                 throws StorageObjectException, SQLException
 947         {
 948                 long startTime = System.currentTimeMillis();
 949                 ResultSet rs;
 950                 try {
 951                         rs = stmt.executeQuery(sql);
 952                         theLog.printInfo((System.currentTimeMillis() - startTime) + "ms. for: "
 953                                 + sql);
 954                 }
 955                 catch (SQLException e)
 956                 {
 957                         theLog.printDebugInfo("Failed: " + (System.currentTimeMillis()
 958                                                                                                                 - startTime) + "ms. for: "+ sql);
 959                         throw e;
 960                 }
 961
 962                 return  rs;
 963         }
 964
 965         /**
 966          * Fuehrt Statement stmt aus und liefert Resultset zurueck. Das SQL-Statment wird
 967          * getimed und geloggt.
 968          * @param stmt PreparedStatement mit der SQL-Anweisung
 969          * @return Liefert ResultSet des Statements zurueck.
 970          * @exception StorageObjectException, SQLException
 971          */
 972         public ResultSet executeSql (PreparedStatement stmt)
 973                 throws StorageObjectException, SQLException {
 974
 975                 long startTime = (new java.util.Date()).getTime();
 976                 ResultSet rs = stmt.executeQuery();
 977                 theLog.printInfo((new java.util.Date().getTime() - startTime) + "ms.");
 978                 return  rs;
 979         }
 980
 981                 /**
 982          * returns the number of rows in the table
 983          */
 984         public int getSize(String where)
 985                 throws SQLException,StorageObjectException
 986         {
 987                 long  startTime = System.currentTimeMillis();
 988                 String sql = "SELECT count(*) FROM "+ theTable + " where " + where;
 989                 Connection con = null;
 990                 Statement stmt = null;
 991                 int result = 0;
 992
 993                 try {
 994                         con = getPooledCon();
 995                         stmt = con.createStatement();
 996                         ResultSet rs = executeSql(stmt,sql);
 997                         while(rs.next()){
 998                                 result = rs.getInt(1);
 999                         }
1000                 } catch (SQLException e) {
1001                         theLog.printError(e.toString());
1002                 } finally {
1003                         freeConnection(con,stmt);
1004                 }
1005                 //theLog.printInfo(theTable + " has "+ result +" rows where " + where);
1006                 theLog.printInfo((System.currentTimeMillis() - startTime) + "ms. for: "
1007                                                                                 + sql);
1008                 return result;
1009         }
1010
1011         public int executeUpdate(Statement stmt, String sql)
1012                 throws StorageObjectException, SQLException
1013         {
1014                 int rs;
1015                 long  startTime = (new java.util.Date()).getTime();
1016                 try
1017                 {
1018                         rs = stmt.executeUpdate(sql);
1019                         theLog.printInfo((new java.util.Date().getTime() - startTime) + "ms. for: "
1020                                                                                                 + sql);
1021                 }
1022                 catch (SQLException e)
1023                 {
1024                         theLog.printDebugInfo("Failed: " + (new java.util.Date().getTime()
1025                                                                                                                 - startTime) + "ms. for: "+ sql);
1026                         throw e;
1027                 }
1028                 return rs;
1029         }
1030
1031         public int executeUpdate(String sql)
1032                 throws StorageObjectException, SQLException
1033         {
1034                 int result=-1;
1035                 long  startTime = (new java.util.Date()).getTime();
1036                 Connection con=null;PreparedStatement pstmt=null;
1037                 try {
1038                         con=getPooledCon();
1039                         pstmt = con.prepareStatement(sql);
1040                         result = pstmt.executeUpdate();
1041                 }
1042                 catch (Exception e) {
1043                         theLog.printDebugInfo("settimage :: setImage gescheitert: "+e.toString());
1044                         throw new StorageObjectException("executeUpdate failed: "+e.toString());
1045                 }
1046                 finally { freeConnection(con,pstmt); }
1047                 theLog.printInfo((new java.util.Date().getTime() - startTime) + "ms. for: "
1048                                                                                 + sql);
1049                 return result;
1050         }
1051
1052         /**
1053          * Wertet ResultSetMetaData aus und setzt interne Daten entsprechend
1054          * @param md ResultSetMetaData
1055          * @exception StorageObjectException
1056          */
1057         private void evalMetaData (ResultSetMetaData md)
1058                 throws StorageObjectException {
1059
1060                 this.evaluatedMetaData = true;
1061                 this.metadataFields = new ArrayList();
1062                 this.metadataLabels = new ArrayList();
1063                 this.metadataNotNullFields = new ArrayList();
1064                 try {
1065                         int numFields = md.getColumnCount();
1066                         this.metadataTypes = new int[numFields];
1067                         String aField;
1068                         int aType;
1069                         for (int i = 1; i <= numFields; i++) {
1070                                 aField = md.getColumnName(i);
1071                                 metadataFields.add(aField);
1072                                 metadataLabels.add(md.getColumnLabel(i));
1073                                 aType = md.getColumnType(i);
1074                                 metadataTypes[i - 1] = aType;
1075                                 if (aField.equals(thePKeyName)) {
1076                                         thePKeyType = aType; thePKeyIndex = i;
1077                                 }
1078                                 if (md.isNullable(i) == md.columnNullable) {
1079                                         metadataNotNullFields.add(aField);
1080                                 }
1081                         }
1082                 } catch (SQLException e) {
1083                         throwSQLException(e, "evalMetaData");
1084                 }
1085         }
1086
1087         /**
1088          *  Wertet die Metadaten eines Resultsets fuer eine Tabelle aus,
1089          *  um die alle Columns und Typen einer Tabelle zu ermitteln.
1090          */
1091         private void get_meta_data () throws StorageObjectException {
1092                 Connection con = null;
1093                 PreparedStatement pstmt = null;
1094                 String sql = "select * from " + theTable + " where 0=1";
1095                 try {
1096                         con = getPooledCon();
1097                         pstmt = con.prepareStatement(sql);
1098                         theLog.printInfo("METADATA: " + sql);
1099                         ResultSet rs = pstmt.executeQuery();
1100                         evalMetaData(rs.getMetaData());
1101                         rs.close();
1102                 } catch (SQLException e) {
1103                         throwSQLException(e, "get_meta_data");
1104                 } finally {
1105                         freeConnection(con, pstmt);
1106                 }
1107         }
1108
1109
1110         public Connection getPooledCon() throws StorageObjectException {
1111                 /* @todo , doublecheck but I'm pretty sure that this is unnecessary. -mh
1112                         try{
1113                         Class.forName("com.codestudio.sql.PoolMan").newInstance();
1114                 } catch (Exception e){
1115                         throw new StorageObjectException("Could not find the PoolMan Driver"
1116                                                                                                                                                                 +e.toString());
1117                 }*/
1118                 Connection con = null;
1119                 try{
1120                         con = SQLManager.getInstance().requestConnection();
1121                 } catch(SQLException e){
1122                         theLog.printError("could not connect to the database "+e.toString());
1123                         System.err.println("could not connect to the database "+e.toString());
1124                         throw new StorageObjectException("Could not connect to the database"+
1125                                                                                                                                                                 e.toString());
1126                 }
1127                 return con;
1128         }
1129
1130         public void freeConnection (Connection con, Statement stmt)
1131                 throws StorageObjectException {
1132                 SQLManager.getInstance().closeStatement(stmt);
1133                 SQLManager.getInstance().returnConnection(con);
1134         }
1135
1136         /**
1137          * Wertet SQLException aus und wirft dannach eine StorageObjectException
1138          * @param sqe SQLException
1139          * @param wo Funktonsname, in der die SQLException geworfen wurde
1140          * @exception StorageObjectException
1141          */
1142         protected void throwSQLException (SQLException sqe, String wo)
1143                 throws StorageObjectException {
1144                 String state = "";
1145                 String message = "";
1146                 int vendor = 0;
1147                 if (sqe != null) {
1148                         state = sqe.getSQLState();
1149                         message = sqe.getMessage();
1150                         vendor = sqe.getErrorCode();
1151                 }
1152                 theLog.printError(state + ": " + vendor + " : " + message + " Funktion: "
1153                                 + wo);
1154                 throw  new StorageObjectException((sqe == null) ? "undefined sql exception" :
1155                                 sqe.toString());
1156         }
1157
1158         protected void _throwStorageObjectException (Exception e, String wo)
1159                 throws StorageObjectException {
1160                 if (e != null) {
1161                                 theLog.printError(e.toString()+ wo);
1162                                 throw  new StorageObjectException(wo + e.toString());
1163                 } else {
1164                                 theLog.printError(wo);
1165                                 throw  new StorageObjectException(wo);
1166                 }
1167
1168         }
1169
1170         /**
1171          * Loggt Fehlermeldung mit dem Parameter Message und wirft dannach
1172          * eine StorageObjectException
1173          * @param message Nachricht mit dem Fehler
1174          * @exception StorageObjectException
1175          */
1176         void throwStorageObjectException (String message)
1177                 throws StorageObjectException {
1178                 _throwStorageObjectException(null, message);
1179         }
1180
1181 }
1182
1183
1184