Initial revision
[mir.git] / source / mir / storage / Database.java
diff --git a/source/mir/storage/Database.java b/source/mir/storage/Database.java
new file mode 100755 (executable)
index 0000000..4996931
--- /dev/null
@@ -0,0 +1,1082 @@
+/*
+ * put your module comment here
+ */
+package mir.storage;
+
+import  java.sql.*;
+import  java.lang.*;
+import  java.io.*;
+import  java.util.*;
+import  freemarker.template.*;
+import  com.javaexchange.dbConnectionBroker.*;
+import  mir.storage.StorageObject;
+import  mir.entity.*;
+import  mir.misc.*;
+
+
+/**
+ * Diese Klasse implementiert die Zugriffsschicht auf die Datenbank.
+ * Alle Projektspezifischen Datenbankklassen erben von dieser Klasse.
+ * In den Unterklassen wird im Minimalfall nur die Tabelle angegeben.
+ * Im Konfigurationsfile findet sich eine Verweis auf den verwendeten
+ * Treiber, Host, User und Passwort, ueber den der Zugriff auf die
+ * Datenbank erfolgt.
+ *
+ * @author RK
+ * @version 16.7.1999
+ */
+public class Database implements StorageObject {
+
+       protected DbConnectionBroker        myBroker;
+       protected String                    theTable;
+       protected String                    theCoreTable=null;
+       protected String                    thePKeyName="id";
+       protected int                       thePKeyType;
+       protected boolean                   evaluatedMetaData=false;
+       protected ArrayList                 metadataFields,metadataLabels,metadataNotNullFields;
+       protected int[]                     metadataTypes;
+       protected Class                     theEntityClass;
+       protected StorageObject             myselfDatabase;
+       protected HashMap                   cache;
+       protected SimpleList                popupCache=null;
+       protected boolean                                               hasPopupCache = false;
+       protected SimpleHash                hashCache=null;
+       protected boolean                   hasTimestamp=true;
+       private       String                database_driver;
+       private       String                database_url;
+       private int                         defaultLimit;
+       private DatabaseAdaptor             theAdaptor;
+       protected Logfile                   theLog;
+       protected Connection                con;
+
+       /**
+        * Kontruktor bekommt den Filenamen des Konfigurationsfiles übergeben.
+        * Aus diesem file werden <code>Database.Logfile</code>,
+        * <code>Database.Username</code>,<code>Database.Password</code>,
+        * <code>Database.Host</code> und <code>Database.Adaptor</code>
+        * ausgelesen und ein Broker für die Verbindugen zur Datenbank
+        * erzeugt.
+        *
+        * @param   String confFilename Dateiname der Konfigurationsdatei
+        */
+       public Database() {
+               theLog = Logfile.getInstance(Configuration.getProperty("Home") + Configuration.getProperty("Database.Logfile"));
+               String database_username=Configuration.getProperty("Database.Username");
+               String database_password=Configuration.getProperty("Database.Password");
+               String database_host=Configuration.getProperty("Database.Host");
+               String theAdaptorName=Configuration.getProperty("Database.Adaptor");
+               try {
+                       theEntityClass = Class.forName("mir.entity.GenericEntity");
+                       theAdaptor = (DatabaseAdaptor)Class.forName(theAdaptorName).newInstance();
+                       defaultLimit = Integer.parseInt(Configuration.getProperty("Database.Limit"));
+                       database_driver=theAdaptor.getDriver();
+                       database_url=theAdaptor.getURL(database_username,database_password,database_host);
+                       theLog.printDebugInfo("adding Broker with: " +database_driver+":"+database_url  );
+                       Configuration.addBroker(database_driver,database_url);
+                       myBroker=Configuration.getBroker();
+               }
+               catch (Exception e){
+                       theLog.printError("Bei Konstruktion von Database() with " + theAdaptorName + " -- " +e.toString());
+               }
+       }
+
+       /**
+        * Liefert die Entity-Klasse zurück, in der eine Datenbankzeile gewrappt
+        * wird. Wird die Entity-Klasse durch die erbende Klasse nicht überschrieben,
+        * wird eine mir.entity.GenericEntity erzeugt.
+        *
+        * @return Class-Objekt der Entity
+        */
+       public java.lang.Class getEntityClass () {
+               return  theEntityClass;
+       }
+
+       /**
+        * Liefert die Standardbeschränkung von select-Statements zurück, also
+        * wieviel Datensätze per Default selektiert werden.
+        *
+        * @return Standard-Anzahl der Datensätze
+        */
+       public int getLimit () {
+               return  defaultLimit;
+       }
+
+       /**
+        * Liefert den Namen des Primary-Keys zurück. Wird die Variable nicht von
+        * der erbenden Klasse überschrieben, so ist der Wert <code>PKEY</code>
+        * @return Name des Primary-Keys
+        */
+       public String getIdName () {
+               return  thePKeyName;
+       }
+
+       /**
+        * Liefert den Namen der Tabelle, auf das sich das Datenbankobjekt bezieht.
+        *
+        * @return Name der Tabelle
+        */
+       public String getTableName () {
+               return  theTable;
+       }
+
+       /*
+        *   Dient dazu vererbte Tabellen bei objectrelationalen DBMS
+        *   zu speichern, wenn die id einer Tabelle in der parenttabelle verwaltet wird.
+        *   @return liefert theCoreTabel als String zurueck, wenn gesetzt, sonst
+        *    the Table
+        */
+
+       public String getCoreTable(){
+               if (theCoreTable!=null) return theCoreTable;
+               else return theTable;
+       }
+
+       /**
+        * Liefert Feldtypen der Felder der Tabelle zurueck (s.a. java.sql.Types)
+        * @return int-Array mit den Typen der Felder
+        * @exception StorageObjectException
+        */
+       public int[] getTypes () throws StorageObjectException {
+               if (metadataTypes == null)
+                       get_meta_data();
+               return  metadataTypes;
+       }
+
+       /**
+        * Liefert eine Liste der Labels der Tabellenfelder
+        * @return ArrayListe mit Labeln
+        * @exception StorageObjectException
+        */
+       public ArrayList getLabels () throws StorageObjectException {
+               if (metadataLabels == null)
+                       get_meta_data();
+               return  metadataLabels;
+       }
+
+       /**
+        * Liefert eine Liste der Felder der Tabelle
+        * @return ArrayList mit Feldern
+        * @exception StorageObjectException
+        */
+       public ArrayList getFields () throws StorageObjectException {
+               if (metadataFields == null)
+                       get_meta_data();
+               return  metadataFields;
+       }
+
+
+       /*
+        *   Uebersetzt die Datenbankwerte in einen String.
+        *   @param inValue  Wert aus ResultSet.
+        *   @param aType  Datenbanktyp.
+        *   @return liefert den Wert als String zurueck. Wenn keine Umwandlung moeglich
+        *           dann /unsupported value/
+        */
+       private String getValueAsString (ResultSet rs, int valueIndex, int aType) throws StorageObjectException {
+               String outValue = null;
+               if (rs != null) {
+                       try {
+                               switch (aType) {
+                                       case java.sql.Types.BIT:
+                                               outValue = (rs.getBoolean(valueIndex) == true) ? "1" : "0";
+                                               break;
+                                       case java.sql.Types.INTEGER:case java.sql.Types.SMALLINT:case java.sql.Types.TINYINT:case java.sql.Types.BIGINT:
+                                               int out = rs.getInt(valueIndex);
+                                               if (!rs.wasNull())
+                                                       outValue = new Integer(out).toString();
+                                               break;
+                                       case java.sql.Types.NUMERIC:
+                                               long outl = rs.getLong(valueIndex);
+                                               if (!rs.wasNull())
+                                                       outValue = new Long(outl).toString();
+                                               break;
+                                       case java.sql.Types.REAL:
+                                               float tempf = rs.getFloat(valueIndex);
+                                               if (!rs.wasNull()) {
+                                                       tempf *= 10;
+                                                       tempf += 0.5;
+                                                       int tempf_int = (int)tempf;
+                                                       tempf = (float)tempf_int;
+                                                       tempf /= 10;
+                                                       outValue = "" + tempf;
+                                                       outValue = outValue.replace('.', ',');
+                                               }
+                                               break;
+                                       case java.sql.Types.DOUBLE:
+                                               double tempd = rs.getDouble(valueIndex);
+                                               if (!rs.wasNull()) {
+                                                       tempd *= 10;
+                                                       tempd += 0.5;
+                                                       int tempd_int = (int)tempd;
+                                                       tempd = (double)tempd_int;
+                                                       tempd /= 10;
+                                                       outValue = "" + tempd;
+                                                       outValue = outValue.replace('.', ',');
+                                               }
+                                               break;
+                                       case java.sql.Types.CHAR:case java.sql.Types.VARCHAR:case java.sql.Types.LONGVARCHAR:
+                                               outValue = rs.getString(valueIndex);
+                                               if (outValue != null)
+                                                       outValue = StringUtil.encodeHtml(StringUtil.unquote(outValue));
+                                               break;
+                                       case java.sql.Types.LONGVARBINARY:
+                                               outValue = rs.getString(valueIndex);
+                                               if (outValue != null)
+                                                       outValue = StringUtil.encodeHtml(StringUtil.unquote(outValue));
+                                               break;
+                                       case java.sql.Types.TIMESTAMP:
+                                               Timestamp timestamp = (rs.getTimestamp(valueIndex));
+                                               if (!rs.wasNull()) {
+                                                       outValue = timestamp.toString();
+                                               }
+                                               break;
+                                       default:
+                                               outValue = "<unsupported value>";
+                                               theLog.printWarning("Unsupported Datatype: at " + valueIndex +
+                                                               " (" + aType + ")");
+                               }
+                       } catch (SQLException e) {
+                               throw  new StorageObjectException("Could not get Value out of Resultset -- "
+                                               + e.toString());
+                       }
+               }
+               return  outValue;
+       }
+
+       /*
+        *   select-Operator um einen Datensatz zu bekommen.
+        *   @param id Primaerschluessel des Datensatzes.
+        *   @return liefert EntityObject des gefundenen Datensatzes oder null.
+        */
+       public Entity selectById(String id)
+    throws StorageObjectException {
+
+               if (id==null||id.equals(""))
+      throw new StorageObjectException("id war null");
+               if (cache != null && cache.containsKey(id))
+                       return (Entity)cache.get(id);  // wenn cache gesetzt, evtl. kein roundtrip zur Datenbank
+
+               Statement stmt=null;Connection con=getPooledCon();
+               Entity returnEntity=null;
+               try {
+                       ResultSet rs;
+                       String selectSql = "select * from " + theTable + " where " + thePKeyName + "=" + id;
+                       stmt = con.createStatement();
+                       rs = executeSql(stmt, selectSql);
+                       if (rs != null) {
+                               if (evaluatedMetaData==false) evalMetaData(rs.getMetaData());
+                               if (rs.next())
+                                       returnEntity = makeEntityFromResultSet(rs);
+                               else theLog.printDebugInfo("Keine daten fuer id: " + id + "in Tabelle" + theTable);
+                               rs.close();
+                       }       else {
+        theLog.printDebugInfo("No Data for Id " + id + " in Table " + theTable);
+      }
+               } catch (SQLException sqe){
+      throwSQLException(sqe,"selectById"); return null;
+    } catch (NumberFormatException e) {
+      theLog.printError("ID ist keine Zahl: " + id);
+    } finally {
+      freeConnection(con,stmt);
+    }
+
+               return returnEntity;
+       }
+
+       /**
+        *   select-Operator um Datensaetze zu bekommen, die key = value erfuellen.
+        *   @param key  Datenbankfeld der Bedingung.
+        *   @param value  Wert die der key anehmen muss.
+        *   @return EntityList mit den gematchten Entities
+        */
+
+       public EntityList selectByFieldValue(String aField, String aValue)
+               throws StorageObjectException {
+
+               return selectByFieldValue(aField, aValue, 0);
+       }
+
+       /**
+        *   select-Operator um Datensaetze zu bekommen, die key = value erfuellen.
+        *   @param key  Datenbankfeld der Bedingung.
+        *   @param value  Wert die der key anehmen muss.
+        *   @param offset  Gibt an ab welchem Datensatz angezeigt werden soll.
+        *   @return EntityList mit den gematchten Entities
+        */
+
+       public EntityList selectByFieldValue(String aField, String aValue, int offset)
+               throws StorageObjectException   {
+
+               return selectByWhereClause(aField + "=" + aValue, offset);
+       }
+
+
+       /**
+        * select-Operator liefert eine EntityListe mit den gematchten Datensätzen zurück.
+        * Also offset wird der erste Datensatz genommen.
+        *
+        * @param wc where-Clause
+        * @return EntityList mit den gematchten Entities
+        * @exception StorageObjectException
+        */
+       public EntityList selectByWhereClause(String where)
+               throws StorageObjectException   {
+
+               return selectByWhereClause(where, 0);
+       }
+
+
+       /**
+        * select-Operator liefert eine EntityListe mit den gematchten Datensätzen zurück.
+        * Als maximale Anzahl wird das Limit auf der Konfiguration genommen.
+        *
+        * @param wc where-Clause
+        * @param offset ab welchem Datensatz.
+        * @return EntityList mit den gematchten Entities
+        * @exception StorageObjectException
+        */
+       public EntityList selectByWhereClause(String whereClause, int offset)
+               throws StorageObjectException   {
+
+               return selectByWhereClause(whereClause, null, offset);
+       }
+
+       /**
+        * select-Operator liefert eine EntityListe mit den gematchten Datensätzen zurück.
+        * Also offset wird der erste Datensatz genommen.
+        * Als maximale Anzahl wird das Limit auf der Konfiguration genommen.
+        *
+        * @param wc where-Clause
+        * @param ob orderBy-Clause
+        * @return EntityList mit den gematchten Entities
+        * @exception StorageObjectException
+        */
+
+       public EntityList selectByWhereClause(String where, String order)
+               throws StorageObjectException   {
+
+               return selectByWhereClause(where, order, 0);
+       }
+       /**
+        * select-Operator liefert eine EntityListe mit den gematchten Datensätzen zurück.
+        * Als maximale Anzahl wird das Limit auf der Konfiguration genommen.
+        *
+        * @param wc where-Clause
+        * @param ob orderBy-Clause
+        * @param offset ab welchem Datensatz
+        * @return EntityList mit den gematchten Entities
+        * @exception StorageObjectException
+        */
+
+       public EntityList selectByWhereClause(String whereClause, String orderBy, int offset)
+               throws StorageObjectException   {
+
+               return selectByWhereClause(whereClause, orderBy, offset, defaultLimit);
+       }
+
+
+       /**
+        * select-Operator liefert eine EntityListe mit den gematchten Datensätzen zurück.
+        * @param wc where-Clause
+        * @param ob orderBy-Clause
+        * @param offset ab welchem Datensatz
+        * @param limit wieviele Datensätze
+        * @return EntityList mit den gematchten Entities
+        * @exception StorageObjectException
+        */
+
+       public EntityList selectByWhereClause(String wc, String ob, int offset, int limit)
+               throws StorageObjectException   {
+
+               // local
+               EntityList    theReturnList=null;
+               Connection    con=null;
+               Statement     stmt=null;
+               ResultSet     rs;
+               int               offsetCount = 0;
+               int           count=0;
+
+
+               // build sql-statement
+               if (wc != null && wc.length() == 0) {
+                       wc = null;
+               }
+               StringBuffer countSql = new StringBuffer("select count(*) from ").append(theTable);
+               StringBuffer selectSql = new StringBuffer("select * from ").append(theTable);
+               if (wc != null) {
+                       selectSql.append(" where ").append(wc);
+                       countSql.append(" where ").append(wc);
+               }
+               if (ob != null && !(ob.length() == 0)) {
+                       selectSql.append(" order by ").append(ob);
+               }
+               if (theAdaptor.hasLimit()) {
+                       if (limit > -1 && offset > -1) {
+                               selectSql.append(" limit ");
+                               if (theAdaptor.reverseLimit()) {
+                                       selectSql.append(limit).append(",").append(offset);
+                               }
+                               else {
+                                       selectSql.append(offset).append(",").append(limit);
+                               }
+                       }
+               }
+
+                       // execute sql
+               try {
+                       con = getPooledCon();
+                       stmt = con.createStatement();
+                       // counting rows
+                       if (theAdaptor.hasLimit()) {
+                               rs = executeSql(stmt, countSql.toString());
+                               if (rs != null) {
+                                       if (rs.next())
+                                               count = rs.getInt(1);
+                                       rs.close();
+                               }
+                               else
+                                       theLog.printError("Mh. Konnte nicht zaehlen: " + countSql);
+                       }
+                       // hier select
+                       rs = executeSql(stmt, selectSql.toString());
+                       if (rs != null) {
+                               theReturnList = new EntityList();
+                               if (evaluatedMetaData == false) {
+                                       evalMetaData(rs.getMetaData());
+                               }
+                               Entity theResultEntity;
+                               while (rs.next()) {
+                                       theResultEntity = makeEntityFromResultSet(rs);
+                                       theReturnList.add(theResultEntity);
+                                       offsetCount++;
+                               }
+                               rs.close();
+                       }
+                       // making entitylist
+                       if (!(theAdaptor.hasLimit()))
+                               count = offsetCount;
+                       if (theReturnList != null) {
+                               theReturnList.setCount(count);
+                               theReturnList.setOffset(offset);
+                               theReturnList.setWhere(wc);
+                               theReturnList.setOrder(ob);
+                               if (offset >= limit) {
+                                       theReturnList.setPrevBatch(offset - limit);
+                               }
+                               if (offset + offsetCount < count) {
+                                       theReturnList.setNextBatch(offset + limit);
+                               }
+                       }
+               } catch (SQLException sqe) {
+                       throwSQLException(sqe, "selectByWhereClause");
+               } finally {
+                       freeConnection(con, stmt);
+               }
+               return  theReturnList;
+       }
+
+       /**
+        *  Bastelt aus einer Zeile der Datenbank ein EntityObjekt.
+        *
+        *  @param rs Das ResultSetObjekt.
+        *  @return Entity Die Entity.
+        */
+
+       public Entity makeEntityFromResultSet (ResultSet rs) throws StorageObjectException {
+               HashMap theResultHash = new HashMap();
+               String theResult = null;
+               int theType;
+               Entity returnEntity = null;
+               try {
+                       int size = metadataFields.size();
+                       for (int i = 0; i < size; i++) {
+                               // alle durchlaufen bis nix mehr da
+                               theType = metadataTypes[i];
+                               if (theType == java.sql.Types.LONGVARBINARY) {
+                                       InputStream us = rs.getAsciiStream(i + 1);
+                                       if (us != null) {
+                                               InputStreamReader is = new InputStreamReader(us);
+                                               char[] data = new char[32768];
+                                               StringBuffer theResultString = new StringBuffer();
+                                               int len;
+                                               while ((len = is.read(data)) > 0) {
+                                                       theResultString.append(data, 0, len);
+                                               }
+                                               is.close();
+                                               theResult = theResultString.toString();
+                                       }
+                                       else {
+                                               theResult = null;
+                                       }
+                               }
+                               else {
+                                       theResult = getValueAsString(rs, (i + 1), theType);
+                               }
+                               if (theResult != null) {
+                                       theResultHash.put(metadataFields.get(i), theResult);
+                               }
+                       }
+                       if (cache != null && theResultHash.containsKey(thePKeyName) && cache.containsKey((String)theResultHash.get(thePKeyName))) {
+                               //theLog.printDebugInfo("CACHE: (out) "+ theResultHash.get(thePKeyName)+ " :"+theTable);
+                               returnEntity = (Entity)cache.get((String)theResultHash.get(thePKeyName));
+                       }
+                       else {
+                               if (theEntityClass != null) {
+                                       returnEntity = (Entity)theEntityClass.newInstance();
+                                       returnEntity.setValues(theResultHash);
+                                       returnEntity.setStorage(myselfDatabase);
+                                       if (cache != null) {
+                                               //theLog.printDebugInfo("CACHE: ( in) " + returnEntity.getId() + " :"+theTable);
+                                               cache.put(returnEntity.getId(), returnEntity);
+                                       }
+                               }
+                               else {
+                                       throwStorageObjectException("Interner Fehler theEntityClass nicht gesetzt!");
+                               }
+                       }
+               }           // try
+               catch (IllegalAccessException e) {
+                       throwStorageObjectException("Kein Zugriff! -- " + e.toString());
+               } catch (IOException e) {
+                       throwStorageObjectException("IOException! -- " + e.toString());
+               } catch (InstantiationException e) {
+                       throwStorageObjectException("Keine Instantiiierung! -- " + e.toString());
+               } catch (SQLException sqe) {
+                       throwSQLException(sqe, "makeEntityFromResultSet");
+                       return  null;
+               }
+               return  returnEntity;
+       }
+
+       /**
+        * insert-Operator: fügt eine Entity in die Tabelle ein. Eine Spalte WEBDB_CREATE
+        * wird automatisch mit dem aktuellen Datum gefuellt.
+        *
+        * @param theEntity
+        * @return der Wert des Primary-keys der eingefügten Entity
+        */
+       public String insert (Entity theEntity) throws StorageObjectException {
+               String returnId = "0";
+               Connection con = null;
+               PreparedStatement pstmt = null;
+               //cache
+               invalidatePopupCache();
+               try {
+                       HashMap theEntityValues = theEntity.getValues();
+                       ArrayList streamedInput = theEntity.streamedInput();
+                       StringBuffer f = new StringBuffer();
+                       StringBuffer v = new StringBuffer();
+                       String aField, aValue;
+                       boolean firstField = true;
+                       // make sql-string
+                       for (int i = 0; i < getFields().size(); i++) {
+                               aField = (String)getFields().get(i);
+                               if (!aField.equals(thePKeyName)) {
+                                       aValue = null;
+                                       // sonderfaelle
+                                       if (aField.equals("webdb_create")) {
+                                               aValue = "NOW()";
+                                       }
+                                       else {
+                                               if (streamedInput != null && streamedInput.contains(aField)) {
+                                                       aValue = "?";
+                                               }
+                                               else {
+                                                       if (theEntityValues.containsKey(aField)) {
+                                                               aValue = "'" + StringUtil.quote((String)theEntityValues.get(aField))
+                                                                               + "'";
+                                                       }
+                                               }
+                                       }
+                                       // wenn Wert gegeben, dann einbauen
+                                       if (aValue != null) {
+                                               if (firstField == false) {
+                                                       f.append(",");
+                                                       v.append(",");
+                                               }
+                                               else {
+                                                       firstField = false;
+                                               }
+                                               f.append(aField);
+                                               v.append(aValue);
+                                       }
+                               }
+                       }         // end for
+                       // insert into db
+                       StringBuffer sqlBuf = new StringBuffer("insert into ").append(theTable).append("(").append(f).append(") values (").append(v).append(")");
+                       String sql = sqlBuf.toString();
+                       theLog.printInfo("INSERT: " + sql);
+                       con = getPooledCon();
+                       con.setAutoCommit(false);
+                       pstmt = con.prepareStatement(sql);
+                       if (streamedInput != null) {
+                               for (int i = 0; i < streamedInput.size(); i++) {
+                                       String inputString = (String)theEntityValues.get(streamedInput.get(i));
+                                       pstmt.setBytes(i + 1, inputString.getBytes());
+                               }
+                       }
+                       pstmt.execute();
+                       pstmt = con.prepareStatement(theAdaptor.getLastInsertSQL((Database)myselfDatabase));
+                       ResultSet rs = pstmt.executeQuery();
+                       rs.next();
+                       returnId = rs.getString(1);
+                       theEntity.setId(returnId);
+               } catch (SQLException sqe) {
+                       throwSQLException(sqe, "insert");
+               } finally {
+                       try {
+                               con.setAutoCommit(true);
+                       } catch (Exception e) {
+                               ;
+                       }
+                       freeConnection(con, pstmt);
+               }
+               return  returnId;
+       }
+
+       /**
+        * update-Operator: aktualisiert eine Entity. Eine Spalte WEBDB_LASTCHANGE
+        * wird automatisch mit dem aktuellen Datum gefuellt.
+        *
+        * @param theEntity
+        */
+       public void update (Entity theEntity) throws StorageObjectException {
+               Connection con = null;
+               PreparedStatement pstmt = null;
+               ArrayList streamedInput = theEntity.streamedInput();
+               HashMap theEntityValues = theEntity.getValues();
+               String id = theEntity.getId();
+               String aField;
+               StringBuffer fv = new StringBuffer();
+               boolean firstField = true;
+               //cache
+               invalidatePopupCache();
+               // build sql statement
+               for (int i = 0; i < getFields().size(); i++) {
+                       aField = (String)metadataFields.get(i);
+                       // only normal cases
+                       if (!(aField.equals(thePKeyName) || aField.equals("webdb_create") ||
+                                       aField.equals("webdb_lastchange") || (streamedInput != null && streamedInput.contains(aField)))) {
+                               if (theEntityValues.containsKey(aField)) {
+                                       if (firstField == false) {
+                                               fv.append(", ");
+                                       }
+                                       else {
+                                               firstField = false;
+                                       }
+                                       fv.append(aField).append("='").append(StringUtil.quote((String)theEntityValues.get(aField))).append("'");
+                               }
+                       }
+               }
+               StringBuffer sql = new StringBuffer("update ").append(theTable).append(" set ").append(fv);
+               // exceptions
+               if (metadataFields.contains("webdb_lastchange")) {
+                       sql.append(",webdb_lastchange=NOW()");
+               }
+               if (streamedInput != null) {
+                       for (int i = 0; i < streamedInput.size(); i++) {
+                               sql.append(",").append(streamedInput.get(i)).append("=?");
+                       }
+               }
+               sql.append(" where id=").append(id);
+               theLog.printInfo("UPDATE: " + sql);
+               // execute sql
+               try {
+                       con = getPooledCon();
+                       con.setAutoCommit(false);
+                       pstmt = con.prepareStatement(sql.toString());
+                       if (streamedInput != null) {
+                               for (int i = 0; i < streamedInput.size(); i++) {
+                                       String inputString = (String)theEntityValues.get(streamedInput.get(i));
+                                       pstmt.setBytes(i + 1, inputString.getBytes());
+                               }
+                       }
+                       pstmt.executeUpdate();
+               } catch (SQLException sqe) {
+                       throwSQLException(sqe, "update");
+               } finally {
+                       try {
+                               con.setAutoCommit(true);
+                       } catch (Exception e) {
+                               ;
+                       }
+                       freeConnection(con, pstmt);
+               }
+       }
+
+       /*
+        *   delete-Operator
+        *   @param id des zu loeschenden Datensatzes
+        *   @return boolean liefert true zurueck, wenn loeschen erfolgreich war.
+        */
+       public boolean delete (String id) throws StorageObjectException {
+               Statement stmt = null;
+               Connection con = null;
+               String sql;
+               int res = 0;
+               // loeschen des caches
+               invalidatePopupCache();
+               sql = "delete from " + theTable + " where " + thePKeyName + "='" + id +
+                               "'";
+               theLog.printInfo("DELETE " + sql);
+               try {
+                       con = getPooledCon();
+                       stmt = con.createStatement();
+                       res = stmt.executeUpdate(sql);
+               } catch (SQLException sqe) {
+                       throwSQLException(sqe, "delete");
+               } finally {
+                       freeConnection(con, stmt);
+               }
+               if (cache != null) {
+                       theLog.printInfo("CACHE: deleted " + id);
+                       cache.remove(id);
+               }
+               return  (res > 0) ? true : false;
+       }
+
+       /* noch nicht implementiert.
+        * @return immer false
+        */
+       public boolean delete (EntityList theEntityList) {
+               invalidatePopupCache();
+               return  false;
+       }
+
+       /**
+        * Diese Methode sollte ueberschrieben werden, wenn fuer die abgeleitete Database-Klasse
+        * eine SimpleList mit Standard-Popupdaten erzeugt werden koennen soll.
+        * @return null
+        */
+       public SimpleList getPopupData () {
+               return  null;
+       }
+
+       /**
+        *  Holt Daten fuer Popups.
+        *  @param name  Name des Feldes.
+        *  @param hasNullValue  Wenn true wird eine leerer  Eintrag fuer die Popups erzeugt.
+        *  @return SimpleList Gibt freemarker.template.SimpleList zurueck.
+        */
+       public SimpleList getPopupData (String name, boolean hasNullValue) {
+               return  getPopupData(name, hasNullValue, null);
+       }
+
+       /**
+        *  Holt Daten fuer Popups.
+        *  @param name  Name des Feldes.
+        *  @param hasNullValue  Wenn true wird eine leerer  Eintrag fuer die Popups erzeugt.
+        *  @param where  Schraenkt die Selektion der Datensaetze ein.
+        *  @return SimpleList Gibt freemarker.template.SimpleList zurueck.
+        */
+       public SimpleList getPopupData (String name, boolean hasNullValue, String where) {
+               return  getPopupData(name, hasNullValue, where, null);
+       }
+
+       /**
+        *  Holt Daten fuer Popups.
+        *  @param name  Name des Feldes.
+        *  @param hasNullValue  Wenn true wird eine leerer  Eintrag fuer die Popups erzeugt.
+        *  @param where  Schraenkt die Selektion der Datensaetze ein.
+        *  @param order  Gibt ein Feld als Sortierkriterium an.
+        *  @return SimpleList Gibt freemarker.template.SimpleList zurueck.
+        */
+       public SimpleList getPopupData (String name, boolean hasNullValue, String where,
+                       String order) {
+               // caching
+               if (hasPopupCache && popupCache != null)
+                       return  popupCache;
+               SimpleList simpleList = null;
+               Connection con = null;
+               Statement stmt = null;
+               // build sql
+               StringBuffer sql = new StringBuffer("select ").append(thePKeyName).append(",").append(name).append(" from ").append(theTable);
+               if (where != null && !(where.length() == 0))
+                       sql.append(" where ").append(where);
+               sql.append(" order by ");
+               if (order != null && !(order.length() == 0))
+                       sql.append(order);
+               else
+                       sql.append(name);
+               // execute sql
+               try {
+                       con = getPooledCon();
+                       stmt = con.createStatement();
+                       ResultSet rs = executeSql(stmt, sql.toString());
+                       if (rs != null) {
+                               if (evaluatedMetaData == false)
+                                       get_meta_data();
+                               simpleList = new SimpleList();
+                               SimpleHash popupDict;
+                               if (hasNullValue) {
+                                       popupDict = new SimpleHash();
+                                       popupDict.put("key", "");
+                                       popupDict.put("value", "--");
+                                       simpleList.add(popupDict);
+                               }
+                               while (rs.next()) {
+                                       popupDict = new SimpleHash();
+                                       popupDict.put("key", getValueAsString(rs, 1, thePKeyType));
+                                       popupDict.put("value", rs.getString(2));
+                                       simpleList.add(popupDict);
+                               }
+                               rs.close();
+                       }
+               } catch (Exception e) {
+                       theLog.printDebugInfo(e.toString());
+               } finally {
+                       freeConnection(con, stmt);
+               }
+               if (hasPopupCache) {
+                       popupCache = simpleList;
+               }
+               return  simpleList;
+       }
+
+       /**
+        * Liefert alle Daten der Tabelle als SimpleHash zurueck. Dies wird verwandt,
+        * wenn in den Templates ein Lookup-Table benoetigt wird. Sollte nur bei kleinen
+        * Tabellen Verwendung finden.
+        * @return SimpleHash mit den Tabellezeilen.
+        */
+       public SimpleHash getHashData () {
+               if (hashCache == null) {
+                       try {
+                               hashCache = HTMLTemplateProcessor.makeSimpleHash(selectByWhereClause("",
+                                               -1));
+                       } catch (StorageObjectException e) {
+                               theLog.printDebugInfo(e.toString());
+                       }
+               }
+               return  hashCache;
+       }
+
+       /* invalidates the popupCache
+        */
+       private void invalidatePopupCache () {
+
+               /** @todo  invalidates toooo much */
+               popupCache = null;
+               hashCache = null;
+       }
+
+       /**
+        * Diese Methode fuehrt den Sqlstring <i>sql</i> aus und timed im Logfile.
+        * @param stmt Statemnt
+        * @param sql Sql-String
+        * @return ResultSet
+        * @exception StorageObjectException, SQLException
+        */
+       public ResultSet executeSql (Statement stmt, String sql) throws StorageObjectException,
+                       SQLException {
+               long startTime = (new java.util.Date()).getTime();
+               ResultSet rs = stmt.executeQuery(sql);
+               theLog.printInfo((new java.util.Date().getTime() - startTime) + "ms. for: "
+                               + sql);
+               return  rs;
+       }
+
+       /**
+        * Fuehrt Statement stmt aus und liefert Resultset zurueck. Das SQL-Statment wird
+        * getimed und geloggt.
+        * @param stmt PreparedStatement mit der SQL-Anweisung
+        * @return Liefert ResultSet des Statements zurueck.
+        * @exception StorageObjectException, SQLException
+        */
+       public ResultSet executeSql (PreparedStatement stmt) throws StorageObjectException,
+                       SQLException {
+               long startTime = (new java.util.Date()).getTime();
+               ResultSet rs = stmt.executeQuery();
+               theLog.printInfo((new java.util.Date().getTime() - startTime) + "ms.");
+               return  rs;
+       }
+
+       /**
+        * returns the number of rows in the table
+        */
+       public int getSize(String where)
+               throws SQLException,StorageObjectException
+       {
+               long  startTime = (new java.util.Date()).getTime();
+               String sql = "SELECT count(*) FROM "+ theTable + " where " + where;
+               //theLog.printDebugInfo("trying: "+ sql);
+               Connection con = null;
+               Statement stmt = null;
+               int result = 0;
+
+               try {
+                       con = getPooledCon();
+                       stmt = con.createStatement();
+                       ResultSet rs = executeSql(stmt,sql);
+                       while(rs.next()){
+                               result = rs.getInt(1);
+                       }
+               } catch (SQLException e) {
+                       theLog.printError(e.toString());
+               } finally {
+                       freeConnection(con,stmt);
+               }
+               theLog.printInfo(theTable + " has "+ result +" rows where " + where);
+               theLog.printInfo((new java.util.Date().getTime() - startTime) + "ms. for: " + sql);
+               return result;
+       }
+
+       public int executeUpdate(Statement stmt, String sql)
+               throws StorageObjectException, SQLException
+       {
+               long  startTime = (new java.util.Date()).getTime();
+               //theLog.printDebugInfo("trying: "+ sql);
+               int rs = stmt.executeUpdate(sql);
+               theLog.printInfo((new java.util.Date().getTime() - startTime) + "ms. for: " + sql);
+               return rs;
+       }
+
+       public int executeUpdate(String sql)
+               throws StorageObjectException, SQLException
+       {
+               int result=-1;
+               long  startTime = (new java.util.Date()).getTime();
+               Connection con=null;PreparedStatement pstmt=null;
+               try {
+                       con=getPooledCon();
+                       pstmt = con.prepareStatement(sql);
+                       result = pstmt.executeUpdate();
+               }
+               catch (Exception e) {theLog.printDebugInfo("settimage :: setImage gescheitert: "+e.toString());}
+               finally {       freeConnection(con,pstmt); }
+               theLog.printInfo((new java.util.Date().getTime() - startTime) + "ms. for: " + sql);
+               return result;
+       }
+
+       /**
+        * Wertet ResultSetMetaData aus und setzt interne Daten entsprechend
+        * @param md ResultSetMetaData
+        * @exception StorageObjectException
+        */
+       private void evalMetaData (ResultSetMetaData md) throws StorageObjectException {
+               this.evaluatedMetaData = true;
+               this.metadataFields = new ArrayList();
+               this.metadataLabels = new ArrayList();
+               this.metadataNotNullFields = new ArrayList();
+               try {
+                       int numFields = md.getColumnCount();
+                       this.metadataTypes = new int[numFields];
+                       String aField;
+                       int aType;
+                       for (int i = 1; i <= numFields; i++) {
+                               aField = md.getColumnName(i);
+                               metadataFields.add(aField);
+                               metadataLabels.add(md.getColumnLabel(i));
+                               aType = md.getColumnType(i);
+                               metadataTypes[i - 1] = aType;
+                               if (aField.equals(thePKeyName)) {
+                                       thePKeyType = aType;
+                               }
+                               if (md.isNullable(i) == md.columnNullable) {
+                                       metadataNotNullFields.add(aField);
+                               }
+                       }
+               } catch (SQLException e) {
+                       throwSQLException(e, "evalMetaData");
+               }
+       }
+
+       /**
+        *  Wertet die Metadaten eines Resultsets fuer eine Tabelle aus,
+        *  um die alle Columns und Typen einer Tabelle zu ermitteln.
+        */
+       private void get_meta_data () throws StorageObjectException {
+               Connection con = null;
+               PreparedStatement pstmt = null;
+               String sql = "select * from " + theTable + " where 0=1";
+               try {
+                       con = getPooledCon();
+                       pstmt = con.prepareStatement(sql);
+                       theLog.printInfo("METADATA: " + sql);
+                       ResultSet rs = pstmt.executeQuery();
+                       evalMetaData(rs.getMetaData());
+                       rs.close();
+               } catch (SQLException e) {
+                       throwSQLException(e, "get_meta_data");
+               } finally {
+                       freeConnection(con, pstmt);
+               }
+       }
+
+       /**
+        * Datenbankverbindung wird geschlossen
+        */
+       public void disconnectPool () {
+               try {
+                       myBroker.destroy(100);
+               } catch (SQLException sqe) {
+                       ;
+               }
+       }
+
+       /**
+        * Liefert ein Connection-Objekt aus dem ConnectionPool.
+        * @return Connection Objekt.
+        */
+       public Connection getPooledCon () throws StorageObjectException {
+               if (myBroker != null) {
+                       Connection con = myBroker.getConnection();
+                       if (con != null)
+                               return  con;
+               }
+               throw  new StorageObjectException("KEINE VERBINDUNG ZUR DATENBANK");
+       }
+
+       /**
+        * Connection und StatementObjekt werden geschlossen und an den Connectionpool
+        * zurückgeben
+        * @param con Connection zur Datenbank
+        * @param stmt Statement-Objekt
+        */
+       public void freeConnection (Connection con, Statement stmt) {
+               try {
+                       if (stmt != null)
+                               stmt.close();
+               } catch (SQLException e1) {
+                       theLog.printDebugInfo(e1.toString());
+               }
+               if (con != null)
+                       myBroker.freeConnection(con);
+               else
+                       theLog.printDebugInfo("Con was null!");
+       }
+
+       /**
+        * Wertet SQLException aus und wirft dannach eine StorageObjectException
+        * @param sqe SQLException
+        * @param wo Funktonsname, in der die SQLException geworfen wurde
+        * @exception StorageObjectException
+        */
+       void throwSQLException (SQLException sqe, String wo) throws StorageObjectException {
+               String state = "";
+               String message = "";
+               int vendor = 0;
+               if (sqe != null) {
+                       state = sqe.getSQLState();
+                       message = sqe.getMessage();
+                       vendor = sqe.getErrorCode();
+               }
+               theLog.printError(state + ": " + vendor + " : " + message + " Funktion: "
+                               + wo);
+               throw  new StorageObjectException((sqe == null) ? "undefined sql exception" :
+                               sqe.toString());
+       }
+
+       /**
+        * Loggt Fehlermeldung mit dem Parameter Message und wirft dannach eine StorageObjectException
+        * @param message Nachricht mit dem Fehler
+        * @exception StorageObjectException
+        */
+       void throwStorageObjectException (String message) throws StorageObjectException {
+               theLog.printError(message);
+               throw  new StorageObjectException(message);
+       }
+}
+
+
+