| /* | |
| * Copyright (c) 2003, 2024, Oracle and/or its affiliates. All rights reserved. | |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| * | |
| * This code is free software; you can redistribute it and/or modify it | |
| * under the terms of the GNU General Public License version 2 only, as | |
| * published by the Free Software Foundation. Oracle designates this | |
| * particular file as subject to the "Classpath" exception as provided | |
| * by Oracle in the LICENSE file that accompanied this code. | |
| * | |
| * This code is distributed in the hope that it will be useful, but WITHOUT | |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| * version 2 for more details (a copy is included in the LICENSE file that | |
| * accompanied this code). | |
| * | |
| * You should have received a copy of the GNU General Public License version | |
| * 2 along with this work; if not, write to the Free Software Foundation, | |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| * | |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| * or visit www.oracle.com if you need additional information or have any | |
| * questions. | |
| */ | |
| package com.sun.rowset.internal; | |
| import java.sql.*; | |
| import javax.sql.*; | |
| import java.util.*; | |
| import java.io.*; | |
| import com.sun.rowset.*; | |
| import java.text.MessageFormat; | |
| import javax.sql.rowset.*; | |
| import javax.sql.rowset.serial.SQLInputImpl; | |
| import javax.sql.rowset.serial.SerialArray; | |
| import javax.sql.rowset.serial.SerialBlob; | |
| import javax.sql.rowset.serial.SerialClob; | |
| import javax.sql.rowset.serial.SerialStruct; | |
| import javax.sql.rowset.spi.*; | |
| /** | |
| * The facility called on internally by the {@code RIOptimisticProvider} implementation to | |
| * propagate changes back to the data source from which the rowset got its data. | |
| * <P> | |
| * A {@code CachedRowSetWriter} object, called a writer, has the public | |
| * method {@code writeData} for writing modified data to the underlying data source. | |
| * This method is invoked by the rowset internally and is never invoked directly by an application. | |
| * A writer also has public methods for setting and getting | |
| * the {@code CachedRowSetReader} object, called a reader, that is associated | |
| * with the writer. The remainder of the methods in this class are private and | |
| * are invoked internally, either directly or indirectly, by the method | |
| * {@code writeData}. | |
| * <P> | |
| * Typically the {@code SyncFactory} manages the {@code RowSetReader} and | |
| * the {@code RowSetWriter} implementations using {@code SyncProvider} objects. | |
| * Standard JDBC RowSet implementations provide an object instance of this | |
| * writer by invoking the {@code SyncProvider.getRowSetWriter()} method. | |
| * | |
| * @version 0.2 | |
| * @author Jonathan Bruce | |
| * @see javax.sql.rowset.spi.SyncProvider | |
| * @see javax.sql.rowset.spi.SyncFactory | |
| * @see javax.sql.rowset.spi.SyncFactoryException | |
| */ | |
| public class CachedRowSetWriter implements TransactionalWriter, Serializable { | |
| /** | |
| * The {@code Connection} object that this writer will use to make a | |
| * connection to the data source to which it will write data. | |
| * | |
| */ | |
| private transient Connection con; | |
| /** | |
| * The SQL {@code SELECT} command that this writer will call | |
| * internally. The method {@code initSQLStatements} builds this | |
| * command by supplying the words "SELECT" and "FROM," and using | |
| * metadata to get the table name and column names . | |
| * | |
| * @serial | |
| */ | |
| private String selectCmd; | |
| /** | |
| * The SQL {@code UPDATE} command that this writer will call | |
| * internally to write data to the rowset's underlying data source. | |
| * The method {@code initSQLStatements} builds this {@code String} | |
| * object. | |
| * | |
| * @serial | |
| */ | |
| private String updateCmd; | |
| /** | |
| * The SQL {@code WHERE} clause the writer will use for update | |
| * statements in the {@code PreparedStatement} object | |
| * it sends to the underlying data source. | |
| * | |
| * @serial | |
| */ | |
| private String updateWhere; | |
| /** | |
| * The SQL {@code DELETE} command that this writer will call | |
| * internally to delete a row in the rowset's underlying data source. | |
| * | |
| * @serial | |
| */ | |
| private String deleteCmd; | |
| /** | |
| * The SQL {@code WHERE} clause the writer will use for delete | |
| * statements in the {@code PreparedStatement} object | |
| * it sends to the underlying data source. | |
| * | |
| * @serial | |
| */ | |
| private String deleteWhere; | |
| /** | |
| * The SQL {@code INSERT INTO} command that this writer will internally use | |
| * to insert data into the rowset's underlying data source. The method | |
| * {@code initSQLStatements} builds this command with a question | |
| * mark parameter placeholder for each column in the rowset. | |
| * | |
| * @serial | |
| */ | |
| private String insertCmd; | |
| /** | |
| * An array containing the column numbers of the columns that are | |
| * needed to uniquely identify a row in the {@code CachedRowSet} object | |
| * for which this {@code CachedRowSetWriter} object is the writer. | |
| * | |
| * @serial | |
| */ | |
| private int[] keyCols; | |
| /** | |
| * An array of the parameters that should be used to set the parameter | |
| * placeholders in a {@code PreparedStatement} object that this | |
| * writer will execute. | |
| * | |
| * @serial | |
| */ | |
| @SuppressWarnings("serial") // Array component type is not Serializable | |
| private Object[] params; | |
| /** | |
| * The {@code CachedRowSetReader} object that has been | |
| * set as the reader for the {@code CachedRowSet} object | |
| * for which this {@code CachedRowSetWriter} object is the writer. | |
| * | |
| * @serial | |
| */ | |
| private CachedRowSetReader reader; | |
| /** | |
| * The {@code ResultSetMetaData} object that contains information | |
| * about the columns in the {@code CachedRowSet} object | |
| * for which this {@code CachedRowSetWriter} object is the writer. | |
| * | |
| * @serial | |
| */ | |
| @SuppressWarnings("serial") | |
| private ResultSetMetaData callerMd; | |
| /** | |
| * The number of columns in the {@code CachedRowSet} object | |
| * for which this {@code CachedRowSetWriter} object is the writer. | |
| * | |
| * @serial | |
| */ | |
| private int callerColumnCount; | |
| /** | |
| * This {@code CachedRowSet} will hold the conflicting values | |
| * retrieved from the db and hold it. | |
| */ | |
| private CachedRowSetImpl crsResolve; | |
| /** | |
| * This {@code ArrayList} will hold the values of SyncResolver.* | |
| */ | |
| private ArrayList<Integer> status; | |
| /** | |
| * This will check whether the same field value has changed both | |
| * in database and CachedRowSet. | |
| */ | |
| private int iChangedValsInDbAndCRS; | |
| /** | |
| * This will hold the number of cols for which the values have | |
| * changed only in database. | |
| */ | |
| private int iChangedValsinDbOnly ; | |
| private JdbcRowSetResourceBundle resBundle; | |
| public CachedRowSetWriter() { | |
| try { | |
| resBundle = JdbcRowSetResourceBundle.getJdbcRowSetResourceBundle(); | |
| } catch(IOException ioe) { | |
| throw new RuntimeException(ioe); | |
| } | |
| } | |
| /** | |
| * Propagates changes in the given {@code RowSet} object | |
| * back to its underlying data source and returns {@code true} | |
| * if successful. The writer will check to see if | |
| * the data in the pre-modified rowset (the original values) differ | |
| * from the data in the underlying data source. If data in the data | |
| * source has been modified by someone else, there is a conflict, | |
| * and in that case, the writer will not write to the data source. | |
| * In other words, the writer uses an optimistic concurrency algorithm: | |
| * It checks for conflicts before making changes rather than restricting | |
| * access for concurrent users. | |
| * <P> | |
| * This method is called by the rowset internally when | |
| * the application invokes the method {@code acceptChanges}. | |
| * The {@code writeData} method in turn calls private methods that | |
| * it defines internally. | |
| * The following is a general summary of what the method | |
| * {@code writeData} does, much of which is accomplished | |
| * through calls to its own internal methods. | |
| * <OL> | |
| * <LI>Creates a {@code CachedRowSet} object from the given | |
| * {@code RowSet} object | |
| * <LI>Makes a connection with the data source | |
| * <UL> | |
| * <LI>Disables autocommit mode if it is not already disabled | |
| * <LI>Sets the transaction isolation level to that of the rowset | |
| * </UL> | |
| * <LI>Checks to see if the reader has read new data since the writer | |
| * was last called and, if so, calls the method | |
| * {@code initSQLStatements} to initialize new SQL statements | |
| * <UL> | |
| * <LI>Builds new {@code SELECT}, {@code UPDATE}, | |
| * {@code INSERT}, and {@code DELETE} statements | |
| * <LI>Uses the {@code CachedRowSet} object's metadata to | |
| * determine the table name, column names, and the columns | |
| * that make up the primary key | |
| * </UL> | |
| * <LI>When there is no conflict, propagates changes made to the | |
| * {@code CachedRowSet} object back to its underlying data source | |
| * <UL> | |
| * <LI>Iterates through each row of the {@code CachedRowSet} object | |
| * to determine whether it has been updated, inserted, or deleted | |
| * <LI>If the corresponding row in the data source has not been changed | |
| * since the rowset last read its | |
| * values, the writer will use the appropriate command to update, | |
| * insert, or delete the row | |
| * <LI>If any data in the data source does not match the original values | |
| * for the {@code CachedRowSet} object, the writer will roll | |
| * back any changes it has made to the row in the data source. | |
| * </UL> | |
| * </OL> | |
| * | |
| * @return {@code true} if changes to the rowset were successfully | |
| * written to the rowset's underlying data source; | |
| * {@code false} otherwise | |
| */ | |
| public boolean writeData(RowSetInternal caller) throws SQLException { | |
| long conflicts = 0; | |
| boolean showDel = false; | |
| PreparedStatement pstmtIns = null; | |
| iChangedValsInDbAndCRS = 0; | |
| iChangedValsinDbOnly = 0; | |
| // We assume caller is a CachedRowSet | |
| CachedRowSetImpl crs = (CachedRowSetImpl)caller; | |
| // crsResolve = new CachedRowSetImpl(); | |
| this.crsResolve = new CachedRowSetImpl(); | |
| // The reader is registered with the writer at design time. | |
| // This is not required, in general. The reader has logic | |
| // to get a JDBC connection, so call it. | |
| con = reader.connect(caller); | |
| if (con == null) { | |
| throw new SQLException(resBundle.handleGetObject("crswriter.connect").toString()); | |
| } | |
| /* | |
| // Fix 6200646. | |
| // Don't change the connection or transaction properties. This will fail in a | |
| // J2EE container. | |
| if (con.getAutoCommit() == true) { | |
| con.setAutoCommit(false); | |
| } | |
| con.setTransactionIsolation(crs.getTransactionIsolation()); | |
| */ | |
| initSQLStatements(crs); | |
| int iColCount; | |
| RowSetMetaDataImpl rsmdWrite = (RowSetMetaDataImpl)crs.getMetaData(); | |
| RowSetMetaDataImpl rsmdResolv = new RowSetMetaDataImpl(); | |
| iColCount = rsmdWrite.getColumnCount(); | |
| int sz= crs.size()+1; | |
| status = new ArrayList<>(sz); | |
| status.add(0,null); | |
| rsmdResolv.setColumnCount(iColCount); | |
| for(int i =1; i <= iColCount; i++) { | |
| rsmdResolv.setColumnType(i, rsmdWrite.getColumnType(i)); | |
| rsmdResolv.setColumnName(i, rsmdWrite.getColumnName(i)); | |
| rsmdResolv.setNullable(i, ResultSetMetaData.columnNullableUnknown); | |
| } | |
| this.crsResolve.setMetaData(rsmdResolv); | |
| // moved outside the insert inner loop | |
| //pstmtIns = con.prepareStatement(insertCmd); | |
| if (callerColumnCount < 1) { | |
| // No data, so return success. | |
| if (reader.getCloseConnection() == true) | |
| con.close(); | |
| return true; | |
| } | |
| // We need to see rows marked for deletion. | |
| showDel = crs.getShowDeleted(); | |
| crs.setShowDeleted(true); | |
| // Look at all the rows. | |
| crs.beforeFirst(); | |
| int rows =1; | |
| while (crs.next()) { | |
| if (crs.rowDeleted()) { | |
| // The row has been deleted. | |
| if (deleteOriginalRow(crs, this.crsResolve)) { | |
| status.add(rows, SyncResolver.DELETE_ROW_CONFLICT); | |
| conflicts++; | |
| } else { | |
| // delete happened without any occurrence of conflicts | |
| // so update status accordingly | |
| status.add(rows, SyncResolver.NO_ROW_CONFLICT); | |
| } | |
| } else if (crs.rowInserted()) { | |
| // The row has been inserted. | |
| pstmtIns = con.prepareStatement(insertCmd); | |
| if (insertNewRow(crs, pstmtIns, this.crsResolve)) { | |
| status.add(rows, SyncResolver.INSERT_ROW_CONFLICT); | |
| conflicts++; | |
| } else { | |
| // insert happened without any occurrence of conflicts | |
| // so update status accordingly | |
| status.add(rows, SyncResolver.NO_ROW_CONFLICT); | |
| } | |
| } else if (crs.rowUpdated()) { | |
| // The row has been updated. | |
| if (updateOriginalRow(crs)) { | |
| status.add(rows, SyncResolver.UPDATE_ROW_CONFLICT); | |
| conflicts++; | |
| } else { | |
| // update happened without any occurrence of conflicts | |
| // so update status accordingly | |
| status.add(rows, SyncResolver.NO_ROW_CONFLICT); | |
| } | |
| } else { | |
| /** The row is neither of inserted, updated or deleted. | |
| * So set nulls in the this.crsResolve for this row, | |
| * as nothing is to be done for such rows. | |
| * Also note that if such a row has been changed in database | |
| * and we have not changed(inserted, updated or deleted) | |
| * that is fine. | |
| **/ | |
| int icolCount = crs.getMetaData().getColumnCount(); | |
| status.add(rows, SyncResolver.NO_ROW_CONFLICT); | |
| this.crsResolve.moveToInsertRow(); | |
| for(int cols=0;cols<iColCount;cols++) { | |
| this.crsResolve.updateNull(cols+1); | |
| } //end for | |
| this.crsResolve.insertRow(); | |
| this.crsResolve.moveToCurrentRow(); | |
| } //end if | |
| rows++; | |
| } //end while | |
| // close the insert statement | |
| if(pstmtIns!=null) | |
| pstmtIns.close(); | |
| // reset | |
| crs.setShowDeleted(showDel); | |
| crs.beforeFirst(); | |
| this.crsResolve.beforeFirst(); | |
| if(conflicts != 0) { | |
| SyncProviderException spe = new SyncProviderException(conflicts + " " + | |
| resBundle.handleGetObject("crswriter.conflictsno").toString()); | |
| //SyncResolver syncRes = spe.getSyncResolver(); | |
| SyncResolverImpl syncResImpl = (SyncResolverImpl) spe.getSyncResolver(); | |
| syncResImpl.setCachedRowSet(crs); | |
| syncResImpl.setCachedRowSetResolver(this.crsResolve); | |
| syncResImpl.setStatus(status); | |
| syncResImpl.setCachedRowSetWriter(this); | |
| throw spe; | |
| } else { | |
| return true; | |
| } | |
| /* | |
| if (conflict == true) { | |
| con.rollback(); | |
| return false; | |
| } else { | |
| con.commit(); | |
| if (reader.getCloseConnection() == true) { | |
| con.close(); | |
| } | |
| return true; | |
| } | |
| */ | |
| } //end writeData | |
| /** | |
| * Updates the given {@code CachedRowSet} object's underlying data | |
| * source so that updates to the rowset are reflected in the original | |
| * data source, and returns {@code false} if the update was successful. | |
| * A return value of {@code true} indicates that there is a conflict, | |
| * meaning that a value updated in the rowset has already been changed by | |
| * someone else in the underlying data source. A conflict can also exist | |
| * if, for example, more than one row in the data source would be affected | |
| * by the update or if no rows would be affected. In any case, if there is | |
| * a conflict, this method does not update the underlying data source. | |
| * <P> | |
| * This method is called internally by the method {@code writeData} | |
| * if a row in the {@code CachedRowSet} object for which this | |
| * {@code CachedRowSetWriter} object is the writer has been updated. | |
| * | |
| * @return {@code false} if the update to the underlying data source is | |
| * successful; {@code true} otherwise | |
| * @throws SQLException if a database access error occurs | |
| */ | |
| private boolean updateOriginalRow(CachedRowSet crs) | |
| throws SQLException { | |
| PreparedStatement pstmt; | |
| int i = 0; | |
| int idx = 0; | |
| // Select the row from the database. | |
| ResultSet origVals = crs.getOriginalRow(); | |
| origVals.next(); | |
| try { | |
| updateWhere = buildWhereClause(updateWhere, origVals); | |
| /** | |
| * The following block of code is for checking a particular type of | |
| * query where in there is a where clause. Without this block, if a | |
| * SQL statement is built the "where" clause will appear twice hence | |
| * the DB errors out and a SQLException is thrown. This code also | |
| * considers that the where clause is in the right place as the | |
| * CachedRowSet object would already have been populated with this | |
| * query before coming to this point. | |
| **/ | |
| String tempselectCmd = selectCmd.toLowerCase(); | |
| int idxWhere = tempselectCmd.indexOf("where"); | |
| if(idxWhere != -1) | |
| { | |
| String tempSelect = selectCmd.substring(0,idxWhere); | |
| selectCmd = tempSelect; | |
| } | |
| pstmt = con.prepareStatement(selectCmd + updateWhere, | |
| ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY); | |
| for (i = 0; i < keyCols.length; i++) { | |
| if (params[i] != null) { | |
| pstmt.setObject(++idx, params[i]); | |
| } else { | |
| continue; | |
| } | |
| } | |
| try { | |
| pstmt.setMaxRows(crs.getMaxRows()); | |
| pstmt.setMaxFieldSize(crs.getMaxFieldSize()); | |
| pstmt.setEscapeProcessing(crs.getEscapeProcessing()); | |
| pstmt.setQueryTimeout(crs.getQueryTimeout()); | |
| } catch (Exception ex) { | |
| // Older driver don't support these operations. | |
| } | |
| ResultSet rs = null; | |
| rs = pstmt.executeQuery(); | |
| ResultSetMetaData rsmd = rs.getMetaData(); | |
| if (rs.next()) { | |
| if (rs.next()) { | |
| /** More than one row conflict. | |
| * If rs has only one row we are able to | |
| * uniquely identify the row where update | |
| * have to happen else if more than one | |
| * row implies we cannot uniquely identify the row | |
| * where we have to do updates. | |
| * crs.setKeyColumns needs to be set to | |
| * come out of this situation. | |
| */ | |
| return true; | |
| } | |
| // don't close the rs | |
| // we require the record in rs to be used. | |
| // rs.close(); | |
| // pstmt.close(); | |
| rs.first(); | |
| // how many fields need to be updated | |
| int colsNotChanged = 0; | |
| Vector<Integer> cols = new Vector<>(); | |
| String updateExec = updateCmd; | |
| Object orig; | |
| Object curr; | |
| Object rsval; | |
| boolean boolNull = true; | |
| Object objVal = null; | |
| // There's only one row and the cursor | |
| // needs to be on that row. | |
| boolean first = true; | |
| boolean flag = true; | |
| this.crsResolve.moveToInsertRow(); | |
| for (i = 1; i <= callerColumnCount; i++) { | |
| orig = origVals.getObject(i); | |
| curr = crs.getObject(i); | |
| rsval = rs.getObject(i); | |
| /* | |
| * the following block creates equivalent objects | |
| * that would have been created if this rs is populated | |
| * into a CachedRowSet so that comparison of the column values | |
| * from the ResultSet and CachedRowSet are possible | |
| */ | |
| Map<String, Class<?>> map = (crs.getTypeMap() == null)?con.getTypeMap():crs.getTypeMap(); | |
| if (rsval instanceof Struct) { | |
| Struct s = (Struct)rsval; | |
| // look up the class in the map | |
| Class<?> c = null; | |
| c = map.get(s.getSQLTypeName()); | |
| if (c != null) { | |
| // create new instance of the class | |
| SQLData obj = null; | |
| try { | |
| @SuppressWarnings("deprecation") | |
| Object tmp = c.newInstance(); | |
| obj = (SQLData)tmp; | |
| } catch (Exception ex) { | |
| throw new SQLException("Unable to Instantiate: ", ex); | |
| } | |
| // get the attributes from the struct | |
| Object attribs[] = s.getAttributes(map); | |
| // create the SQLInput "stream" | |
| SQLInputImpl sqlInput = new SQLInputImpl(attribs, map); | |
| // read the values... | |
| obj.readSQL(sqlInput, s.getSQLTypeName()); | |
| rsval = obj; | |
| } | |
| } else if (rsval instanceof SQLData) { | |
| rsval = new SerialStruct((SQLData)rsval, map); | |
| } else if (rsval instanceof Blob) { | |
| rsval = new SerialBlob((Blob)rsval); | |
| } else if (rsval instanceof Clob) { | |
| rsval = new SerialClob((Clob)rsval); | |
| } else if (rsval instanceof java.sql.Array) { | |
| rsval = new SerialArray((java.sql.Array)rsval, map); | |
| } | |
| // reset boolNull if it had been set | |
| boolNull = true; | |
| /** This additional checking has been added when the current value | |
| * in the DB is null, but the DB had a different value when the | |
| * data was actually fetched into the CachedRowSet. | |
| **/ | |
| if(rsval == null && orig != null) { | |
| // value in db has changed | |
| // don't proceed with synchronization | |
| // get the value in db and pass it to the resolver. | |
| iChangedValsinDbOnly++; | |
| // Set the boolNull to false, | |
| // in order to set the actual value; | |
| boolNull = false; | |
| objVal = rsval; | |
| } | |
| /** Adding the checking for rsval to be "not" null or else | |
| * it would through a NullPointerException when the values | |
| * are compared. | |
| **/ | |
| else if(rsval != null && (!rsval.equals(orig))) | |
| { | |
| // value in db has changed | |
| // don't proceed with synchronization | |
| // get the value in db and pass it to the resolver. | |
| iChangedValsinDbOnly++; | |
| // Set the boolNull to false, | |
| // in order to set the actual value; | |
| boolNull = false; | |
| objVal = rsval; | |
| } else if ( (orig == null || curr == null) ) { | |
| /** Adding the additional condition of checking for "flag" | |
| * boolean variable, which would otherwise result in | |
| * building a invalid query, as the comma would not be | |
| * added to the query string. | |
| **/ | |
| if (first == false || flag == false) { | |
| updateExec += ", "; | |
| } | |
| updateExec += crs.getMetaData().getColumnName(i); | |
| cols.add(i); | |
| updateExec += " = ? "; | |
| first = false; | |
| /** Adding the extra condition for orig to be "not" null as the | |
| * condition for orig to be null is take prior to this, if this | |
| * is not added it will result in a NullPointerException when | |
| * the values are compared. | |
| **/ | |
| } else if (orig.equals(curr)) { | |
| colsNotChanged++; | |
| //nothing to update in this case since values are equal | |
| /** Adding the extra condition for orig to be "not" null as the | |
| * condition for orig to be null is take prior to this, if this | |
| * is not added it will result in a NullPointerException when | |
| * the values are compared. | |
| **/ | |
| } else if(orig.equals(curr) == false) { | |
| // When values from db and values in CachedRowSet are not equal, | |
| // if db value is same as before updation for each col in | |
| // the row before fetching into CachedRowSet, | |
| // only then we go ahead with updation, else we | |
| // throw SyncProviderException. | |
| // if value has changed in db after fetching from db | |
| // for some cols of the row and at the same time, some other cols | |
| // have changed in CachedRowSet, no synchronization happens | |
| // Synchronization happens only when data when fetching is | |
| // same or at most has changed in cachedrowset | |
| // check orig value with what is there in crs for a column | |
| // before updation in crs. | |
| if(crs.columnUpdated(i)) { | |
| if(rsval.equals(orig)) { | |
| // At this point we are sure that | |
| // the value updated in crs was from | |
| // what is in db now and has not changed | |
| if (flag == false || first == false) { | |
| updateExec += ", "; | |
| } | |
| updateExec += crs.getMetaData().getColumnName(i); | |
| cols.add(i); | |
| updateExec += " = ? "; | |
| flag = false; | |
| } else { | |
| // Here the value has changed in the db after | |
| // data was fetched | |
| // Plus store this row from CachedRowSet and keep it | |
| // in a new CachedRowSet | |
| boolNull= false; | |
| objVal = rsval; | |
| iChangedValsInDbAndCRS++; | |
| } | |
| } | |
| } | |
| if(!boolNull) { | |
| this.crsResolve.updateObject(i,objVal); | |
| } else { | |
| this.crsResolve.updateNull(i); | |
| } | |
| } //end for | |
| rs.close(); | |
| pstmt.close(); | |
| this.crsResolve.insertRow(); | |
| this.crsResolve.moveToCurrentRow(); | |
| /** | |
| * if nothing has changed return now - this can happen | |
| * if column is updated to the same value. | |
| * if colsNotChanged == callerColumnCount implies we are updating | |
| * the database with ALL COLUMNS HAVING SAME VALUES, | |
| * so skip going to database, else do as usual. | |
| **/ | |
| if ( (first == false && cols.size() == 0) || | |
| colsNotChanged == callerColumnCount ) { | |
| return false; | |
| } | |
| if(iChangedValsInDbAndCRS != 0 || iChangedValsinDbOnly != 0) { | |
| return true; | |
| } | |
| updateExec += updateWhere; | |
| pstmt = con.prepareStatement(updateExec); | |
| // Comments needed here | |
| for (i = 0; i < cols.size(); i++) { | |
| Object obj = crs.getObject(cols.get(i)); | |
| if (obj != null) | |
| pstmt.setObject(i + 1, obj); | |
| else | |
| pstmt.setNull(i + 1,crs.getMetaData().getColumnType(i + 1)); | |
| } | |
| idx = i; | |
| // Comments needed here | |
| for (i = 0; i < keyCols.length; i++) { | |
| if (params[i] != null) { | |
| pstmt.setObject(++idx, params[i]); | |
| } else { | |
| continue; | |
| } | |
| } | |
| i = pstmt.executeUpdate(); | |
| /** | |
| * i should be equal to 1(row count), because we update | |
| * one row(returned as row count) at a time, if all goes well. | |
| * if 1 != 1, this implies we have not been able to | |
| * do updations properly i.e there is a conflict in database | |
| * versus what is in CachedRowSet for this particular row. | |
| **/ | |
| return false; | |
| } else { | |
| /** | |
| * Cursor will be here, if the ResultSet may not return even a single row | |
| * i.e. we can't find the row where to update because it has been deleted | |
| * etc. from the db. | |
| * Present the whole row as null to user, to force null to be sync'ed | |
| * and hence nothing to be synced. | |
| * | |
| * NOTE: | |
| * ------ | |
| * In the database if a column that is mapped to java.sql.Types.REAL stores | |
| * a Double value and is compared with value got from ResultSet.getFloat() | |
| * no row is retrieved and will throw a SyncProviderException. For details | |
| * see bug Id 5053830 | |
| **/ | |
| return true; | |
| } | |
| } catch (SQLException ex) { | |
| ex.printStackTrace(); | |
| // if executeUpdate fails it will come here, | |
| // update crsResolve with null rows | |
| this.crsResolve.moveToInsertRow(); | |
| for(i = 1; i <= callerColumnCount; i++) { | |
| this.crsResolve.updateNull(i); | |
| } | |
| this.crsResolve.insertRow(); | |
| this.crsResolve.moveToCurrentRow(); | |
| return true; | |
| } | |
| } | |
| /** | |
| * Inserts a row that has been inserted into the given | |
| * {@code CachedRowSet} object into the data source from which | |
| * the rowset is derived, returning {@code false} if the insertion | |
| * was successful. | |
| * | |
| * @param crs the {@code CachedRowSet} object that has had a row inserted | |
| * and to whose underlying data source the row will be inserted | |
| * @param pstmt the {@code PreparedStatement} object that will be used | |
| * to execute the insertion | |
| * @return {@code false} to indicate that the insertion was successful; | |
| * {@code true} otherwise | |
| * @throws SQLException if a database access error occurs | |
| */ | |
| private boolean insertNewRow(CachedRowSet crs, | |
| PreparedStatement pstmt, CachedRowSetImpl crsRes) throws SQLException { | |
| boolean returnVal = false; | |
| try (PreparedStatement pstmtSel = con.prepareStatement(selectCmd, | |
| ResultSet.TYPE_SCROLL_SENSITIVE, | |
| ResultSet.CONCUR_READ_ONLY); | |
| ResultSet rs = pstmtSel.executeQuery(); | |
| ResultSet rs2 = con.getMetaData().getPrimaryKeys(null, null, | |
| crs.getTableName()) | |
| ) { | |
| ResultSetMetaData rsmd = crs.getMetaData(); | |
| int icolCount = rsmd.getColumnCount(); | |
| String[] primaryKeys = new String[icolCount]; | |
| int k = 0; | |
| while (rs2.next()) { | |
| primaryKeys[k] = rs2.getString("COLUMN_NAME"); | |
| k++; | |
| } | |
| if (rs.next()) { | |
| for (String pkName : primaryKeys) { | |
| if (!isPKNameValid(pkName, rsmd)) { | |
| /* We came here as one of the primary keys | |
| * of the table is not present in the cached | |
| * rowset object, it should be an autoincrement column | |
| * and not included while creating CachedRowSet | |
| * Object, proceed to check for other primary keys | |
| */ | |
| continue; | |
| } | |
| Object crsPK = crs.getObject(pkName); | |
| if (crsPK == null) { | |
| /* | |
| * It is possible that the PK is null on some databases | |
| * and will be filled in at insert time (MySQL for example) | |
| */ | |
| break; | |
| } | |
| String rsPK = rs.getObject(pkName).toString(); | |
| if (crsPK.toString().equals(rsPK)) { | |
| returnVal = true; | |
| this.crsResolve.moveToInsertRow(); | |
| for (int i = 1; i <= icolCount; i++) { | |
| String colname = (rs.getMetaData()).getColumnName(i); | |
| if (colname.equals(pkName)) | |
| this.crsResolve.updateObject(i,rsPK); | |
| else | |
| this.crsResolve.updateNull(i); | |
| } | |
| this.crsResolve.insertRow(); | |
| this.crsResolve.moveToCurrentRow(); | |
| } | |
| } | |
| } | |
| if (returnVal) { | |
| return returnVal; | |
| } | |
| try { | |
| for (int i = 1; i <= icolCount; i++) { | |
| Object obj = crs.getObject(i); | |
| if (obj != null) { | |
| pstmt.setObject(i, obj); | |
| } else { | |
| pstmt.setNull(i,crs.getMetaData().getColumnType(i)); | |
| } | |
| } | |
| pstmt.executeUpdate(); | |
| return false; | |
| } catch (SQLException ex) { | |
| /* | |
| * Cursor will come here if executeUpdate fails. | |
| * There can be many reasons why the insertion failed, | |
| * one can be violation of primary key. | |
| * Hence we cannot exactly identify why the insertion failed, | |
| * present the current row as a null row to the caller. | |
| */ | |
| this.crsResolve.moveToInsertRow(); | |
| for (int i = 1; i <= icolCount; i++) { | |
| this.crsResolve.updateNull(i); | |
| } | |
| this.crsResolve.insertRow(); | |
| this.crsResolve.moveToCurrentRow(); | |
| return true; | |
| } | |
| } | |
| } | |
| /** | |
| * Deletes the row in the underlying data source that corresponds to | |
| * a row that has been deleted in the given {@code CachedRowSet} object | |
| * and returns {@code false} if the deletion was successful. | |
| * <P> | |
| * This method is called internally by this writer's {@code writeData} | |
| * method when a row in the rowset has been deleted. The values in the | |
| * deleted row are the same as those that are stored in the original row | |
| * of the given {@code CachedRowSet} object. If the values in the | |
| * original row differ from the row in the underlying data source, the row | |
| * in the data source is not deleted, and {@code deleteOriginalRow} | |
| * returns {@code true} to indicate that there was a conflict. | |
| * | |
| * | |
| * @return {@code false} if the deletion was successful, which means that | |
| * there was no conflict; {@code true} otherwise | |
| * @throws SQLException if there was a database access error | |
| */ | |
| private boolean deleteOriginalRow(CachedRowSet crs, CachedRowSetImpl crsRes) throws SQLException { | |
| PreparedStatement pstmt; | |
| int i; | |
| int idx = 0; | |
| String strSelect; | |
| // Select the row from the database. | |
| ResultSet origVals = crs.getOriginalRow(); | |
| origVals.next(); | |
| deleteWhere = buildWhereClause(deleteWhere, origVals); | |
| pstmt = con.prepareStatement(selectCmd + deleteWhere, | |
| ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY); | |
| for (i = 0; i < keyCols.length; i++) { | |
| if (params[i] != null) { | |
| pstmt.setObject(++idx, params[i]); | |
| } else { | |
| continue; | |
| } | |
| } | |
| try { | |
| pstmt.setMaxRows(crs.getMaxRows()); | |
| pstmt.setMaxFieldSize(crs.getMaxFieldSize()); | |
| pstmt.setEscapeProcessing(crs.getEscapeProcessing()); | |
| pstmt.setQueryTimeout(crs.getQueryTimeout()); | |
| } catch (Exception ex) { | |
| /* | |
| * Older driver don't support these operations... | |
| */ | |
| ; | |
| } | |
| ResultSet rs = pstmt.executeQuery(); | |
| if (rs.next() == true) { | |
| if (rs.next()) { | |
| // more than one row | |
| return true; | |
| } | |
| rs.first(); | |
| // Now check all the values in rs to be same in | |
| // db also before actually going ahead with deleting | |
| boolean boolChanged = false; | |
| crsRes.moveToInsertRow(); | |
| for (i = 1; i <= crs.getMetaData().getColumnCount(); i++) { | |
| Object original = origVals.getObject(i); | |
| Object changed = rs.getObject(i); | |
| if(original != null && changed != null ) { | |
| if(! (original.toString()).equals(changed.toString()) ) { | |
| boolChanged = true; | |
| crsRes.updateObject(i,origVals.getObject(i)); | |
| } | |
| } else { | |
| crsRes.updateNull(i); | |
| } | |
| } | |
| crsRes.insertRow(); | |
| crsRes.moveToCurrentRow(); | |
| if(boolChanged) { | |
| // do not delete as values in db have changed | |
| // deletion will not happen for this row from db | |
| // exit now returning true. i.e. conflict | |
| return true; | |
| } else { | |
| // delete the row. | |
| // Go ahead with deleting, | |
| // don't do anything here | |
| } | |
| String cmd = deleteCmd + deleteWhere; | |
| pstmt = con.prepareStatement(cmd); | |
| idx = 0; | |
| for (i = 0; i < keyCols.length; i++) { | |
| if (params[i] != null) { | |
| pstmt.setObject(++idx, params[i]); | |
| } else { | |
| continue; | |
| } | |
| } | |
| if (pstmt.executeUpdate() != 1) { | |
| return true; | |
| } | |
| pstmt.close(); | |
| } else { | |
| // didn't find the row | |
| return true; | |
| } | |
| // no conflict | |
| return false; | |
| } | |
| /** | |
| * Sets the reader for this writer to the given reader. | |
| * | |
| * @throws SQLException if a database access error occurs | |
| */ | |
| public void setReader(CachedRowSetReader reader) throws SQLException { | |
| this.reader = reader; | |
| } | |
| /** | |
| * Gets the reader for this writer. | |
| * | |
| * @throws SQLException if a database access error occurs | |
| */ | |
| public CachedRowSetReader getReader() throws SQLException { | |
| return reader; | |
| } | |
| /** | |
| * Composes a {@code SELECT}, {@code UPDATE}, {@code INSERT}, | |
| * and {@code DELETE} statement that can be used by this writer to | |
| * write data to the data source backing the given {@code CachedRowSet} | |
| * object. | |
| * | |
| * @param caller a {@code CachedRowSet} object for which this | |
| * {@code CachedRowSetWriter} object is the writer | |
| * @throws SQLException if a database access error occurs | |
| */ | |
| private void initSQLStatements(CachedRowSet caller) throws SQLException { | |
| int i; | |
| callerMd = caller.getMetaData(); | |
| callerColumnCount = callerMd.getColumnCount(); | |
| if (callerColumnCount < 1) | |
| // No data, so return. | |
| return; | |
| /* | |
| * If the RowSet has a Table name we should use it. | |
| * This is really a hack to get round the fact that | |
| * a lot of the jdbc drivers can't provide the tab. | |
| */ | |
| String table = caller.getTableName(); | |
| if (table == null) { | |
| /* | |
| * attempt to build a table name using the info | |
| * that the driver gave us for the first column | |
| * in the source result set. | |
| */ | |
| table = callerMd.getTableName(1); | |
| if (table == null || table.length() == 0) { | |
| throw new SQLException(resBundle.handleGetObject("crswriter.tname").toString()); | |
| } | |
| } | |
| String catalog = callerMd.getCatalogName(1); | |
| String schema = callerMd.getSchemaName(1); | |
| DatabaseMetaData dbmd = con.getMetaData(); | |
| /* | |
| * Compose a SELECT statement. There are three parts. | |
| */ | |
| // Project List | |
| selectCmd = "SELECT "; | |
| for (i=1; i <= callerColumnCount; i++) { | |
| selectCmd += callerMd.getColumnName(i); | |
| if ( i < callerMd.getColumnCount() ) | |
| selectCmd += ", "; | |
| else | |
| selectCmd += " "; | |
| } | |
| // FROM clause. | |
| selectCmd += "FROM " + buildTableName(dbmd, catalog, schema, table); | |
| /* | |
| * Compose an UPDATE statement. | |
| */ | |
| updateCmd = "UPDATE " + buildTableName(dbmd, catalog, schema, table); | |
| /** | |
| * The following block of code is for checking a particular type of | |
| * query where in there is a where clause. Without this block, if a | |
| * SQL statement is built the "where" clause will appear twice hence | |
| * the DB errors out and a SQLException is thrown. This code also | |
| * considers that the where clause is in the right place as the | |
| * CachedRowSet object would already have been populated with this | |
| * query before coming to this point. | |
| **/ | |
| String tempupdCmd = updateCmd.toLowerCase(); | |
| int idxupWhere = tempupdCmd.indexOf("where"); | |
| if(idxupWhere != -1) | |
| { | |
| updateCmd = updateCmd.substring(0,idxupWhere); | |
| } | |
| updateCmd += "SET "; | |
| /* | |
| * Compose an INSERT statement. | |
| */ | |
| insertCmd = "INSERT INTO " + buildTableName(dbmd, catalog, schema, table); | |
| // Column list | |
| insertCmd += "("; | |
| for (i=1; i <= callerColumnCount; i++) { | |
| insertCmd += callerMd.getColumnName(i); | |
| if ( i < callerMd.getColumnCount() ) | |
| insertCmd += ", "; | |
| else | |
| insertCmd += ") VALUES ("; | |
| } | |
| for (i=1; i <= callerColumnCount; i++) { | |
| insertCmd += "?"; | |
| if (i < callerColumnCount) | |
| insertCmd += ", "; | |
| else | |
| insertCmd += ")"; | |
| } | |
| /* | |
| * Compose a DELETE statement. | |
| */ | |
| deleteCmd = "DELETE FROM " + buildTableName(dbmd, catalog, schema, table); | |
| /* | |
| * set the key descriptors that will be | |
| * needed to construct where clauses. | |
| */ | |
| buildKeyDesc(caller); | |
| } | |
| /** | |
| * Returns a fully qualified table name built from the given catalog and | |
| * table names. The given metadata object is used to get the proper order | |
| * and separator. | |
| * | |
| * @param dbmd a {@code DatabaseMetaData} object that contains metadata | |
| * about this writer's {@code CachedRowSet} object | |
| * @param catalog a {@code String} object with the rowset's catalog | |
| * name | |
| * @param table a {@code String} object with the name of the table from | |
| * which this writer's rowset was derived | |
| * @return a {@code String} object with the fully qualified name of the | |
| * table from which this writer's rowset was derived | |
| * @throws SQLException if a database access error occurs | |
| */ | |
| private String buildTableName(DatabaseMetaData dbmd, | |
| String catalog, String schema, String table) throws SQLException { | |
| // trim all the leading and trailing whitespaces, | |
| // white spaces can never be catalog, schema or a table name. | |
| String cmd = ""; | |
| catalog = catalog.trim(); | |
| schema = schema.trim(); | |
| table = table.trim(); | |
| if (dbmd.isCatalogAtStart() == true) { | |
| if (catalog != null && catalog.length() > 0) { | |
| cmd += catalog + dbmd.getCatalogSeparator(); | |
| } | |
| if (schema != null && schema.length() > 0) { | |
| cmd += schema + "."; | |
| } | |
| cmd += table; | |
| } else { | |
| if (schema != null && schema.length() > 0) { | |
| cmd += schema + "."; | |
| } | |
| cmd += table; | |
| if (catalog != null && catalog.length() > 0) { | |
| cmd += dbmd.getCatalogSeparator() + catalog; | |
| } | |
| } | |
| cmd += " "; | |
| return cmd; | |
| } | |
| /** | |
| * Assigns to the given {@code CachedRowSet} object's | |
| * {@code params} | |
| * field an array whose length equals the number of columns needed | |
| * to uniquely identify a row in the rowset. The array is given | |
| * values by the method {@code buildWhereClause}. | |
| * <P> | |
| * If the {@code CachedRowSet} object's {@code keyCols} | |
| * field has length {@code 0} or is {@code null}, the array | |
| * is set with the column number of every column in the rowset. | |
| * Otherwise, the array in the field {@code keyCols} is set with only | |
| * the column numbers of the columns that are required to form a unique | |
| * identifier for a row. | |
| * | |
| * @param crs the {@code CachedRowSet} object for which this | |
| * {@code CachedRowSetWriter} object is the writer | |
| * | |
| * @throws SQLException if a database access error occurs | |
| */ | |
| private void buildKeyDesc(CachedRowSet crs) throws SQLException { | |
| keyCols = crs.getKeyColumns(); | |
| ResultSetMetaData resultsetmd = crs.getMetaData(); | |
| if (keyCols == null || keyCols.length == 0) { | |
| ArrayList<Integer> listKeys = new ArrayList<Integer>(); | |
| for (int i = 0; i < callerColumnCount; i++ ) { | |
| if(resultsetmd.getColumnType(i+1) != java.sql.Types.CLOB && | |
| resultsetmd.getColumnType(i+1) != java.sql.Types.STRUCT && | |
| resultsetmd.getColumnType(i+1) != java.sql.Types.SQLXML && | |
| resultsetmd.getColumnType(i+1) != java.sql.Types.BLOB && | |
| resultsetmd.getColumnType(i+1) != java.sql.Types.ARRAY && | |
| resultsetmd.getColumnType(i+1) != java.sql.Types.OTHER ) | |
| listKeys.add(i+1); | |
| } | |
| keyCols = new int[listKeys.size()]; | |
| for (int i = 0; i < listKeys.size(); i++ ) | |
| keyCols[i] = listKeys.get(i); | |
| } | |
| params = new Object[keyCols.length]; | |
| } | |
| /** | |
| * Constructs an SQL {@code WHERE} clause using the given | |
| * string as a starting point. The resulting clause will contain | |
| * a column name and " = ?" for each key column, that is, each column | |
| * that is needed to form a unique identifier for a row in the rowset. | |
| * This {@code WHERE} clause can be added to | |
| * a {@code PreparedStatement} object that updates, inserts, or | |
| * deletes a row. | |
| * <P> | |
| * This method uses the given result set to access values in the | |
| * {@code CachedRowSet} object that called this writer. These | |
| * values are used to build the array of parameters that will serve as | |
| * replacements for the "?" parameter placeholders in the | |
| * {@code PreparedStatement} object that is sent to the | |
| * {@code CachedRowSet} object's underlying data source. | |
| * | |
| * @param whereClause a {@code String} object that is an empty | |
| * string ("") | |
| * @param rs a {@code ResultSet} object that can be used | |
| * to access the {@code CachedRowSet} object's data | |
| * @return a {@code WHERE} clause of the form "{@code WHERE} | |
| * columnName = ? AND columnName = ? AND columnName = ? ..." | |
| * @throws SQLException if a database access error occurs | |
| */ | |
| private String buildWhereClause(String whereClause, | |
| ResultSet rs) throws SQLException { | |
| whereClause = "WHERE "; | |
| for (int i = 0; i < keyCols.length; i++) { | |
| if (i > 0) { | |
| whereClause += "AND "; | |
| } | |
| whereClause += callerMd.getColumnName(keyCols[i]); | |
| params[i] = rs.getObject(keyCols[i]); | |
| if (rs.wasNull() == true) { | |
| whereClause += " IS NULL "; | |
| } else { | |
| whereClause += " = ? "; | |
| } | |
| } | |
| return whereClause; | |
| } | |
| void updateResolvedConflictToDB(CachedRowSet crs, Connection con) throws SQLException { | |
| //String updateExe = ; | |
| PreparedStatement pStmt ; | |
| String strWhere = "WHERE " ; | |
| String strExec =" "; | |
| String strUpdate = "UPDATE "; | |
| int icolCount = crs.getMetaData().getColumnCount(); | |
| int keyColumns[] = crs.getKeyColumns(); | |
| Object param[]; | |
| String strSet=""; | |
| strWhere = buildWhereClause(strWhere, crs); | |
| if (keyColumns == null || keyColumns.length == 0) { | |
| keyColumns = new int[icolCount]; | |
| for (int i = 0; i < keyColumns.length; ) { | |
| keyColumns[i] = ++i; | |
| } | |
| } | |
| param = new Object[keyColumns.length]; | |
| strUpdate = "UPDATE " + buildTableName(con.getMetaData(), | |
| crs.getMetaData().getCatalogName(1), | |
| crs.getMetaData().getSchemaName(1), | |
| crs.getTableName()); | |
| // changed or updated values will become part of | |
| // set clause here | |
| strUpdate += "SET "; | |
| boolean first = true; | |
| for (int i=1; i<=icolCount;i++) { | |
| if (crs.columnUpdated(i)) { | |
| if (first == false) { | |
| strSet += ", "; | |
| } | |
| strSet += crs.getMetaData().getColumnName(i); | |
| strSet += " = ? "; | |
| first = false; | |
| } //end if | |
| } //end for | |
| // keycols will become part of where clause | |
| strUpdate += strSet; | |
| strWhere = "WHERE "; | |
| for (int i = 0; i < keyColumns.length; i++) { | |
| if (i > 0) { | |
| strWhere += "AND "; | |
| } | |
| strWhere += crs.getMetaData().getColumnName(keyColumns[i]); | |
| param[i] = crs.getObject(keyColumns[i]); | |
| if (crs.wasNull() == true) { | |
| strWhere += " IS NULL "; | |
| } else { | |
| strWhere += " = ? "; | |
| } | |
| } | |
| strUpdate += strWhere; | |
| pStmt = con.prepareStatement(strUpdate); | |
| int idx =0; | |
| for (int i = 0; i < icolCount; i++) { | |
| if(crs.columnUpdated(i+1)) { | |
| Object obj = crs.getObject(i+1); | |
| if (obj != null) { | |
| pStmt.setObject(++idx, obj); | |
| } else { | |
| pStmt.setNull(i + 1,crs.getMetaData().getColumnType(i + 1)); | |
| } //end if ..else | |
| } //end if crs.column... | |
| } //end for | |
| // Set the key cols for after WHERE =? clause | |
| for (int i = 0; i < keyColumns.length; i++) { | |
| if (param[i] != null) { | |
| pStmt.setObject(++idx, param[i]); | |
| } | |
| } | |
| int id = pStmt.executeUpdate(); | |
| } | |
| /** | |
| * | |
| */ | |
| public void commit() throws SQLException { | |
| con.commit(); | |
| if (reader.getCloseConnection() == true) { | |
| con.close(); | |
| } | |
| } | |
| public void commit(CachedRowSetImpl crs, boolean updateRowset) throws SQLException { | |
| con.commit(); | |
| if(updateRowset) { | |
| if(crs.getCommand() != null) | |
| crs.execute(con); | |
| } | |
| if (reader.getCloseConnection() == true) { | |
| con.close(); | |
| } | |
| } | |
| /** | |
| * | |
| */ | |
| public void rollback() throws SQLException { | |
| con.rollback(); | |
| if (reader.getCloseConnection() == true) { | |
| con.close(); | |
| } | |
| } | |
| /** | |
| * | |
| */ | |
| public void rollback(Savepoint s) throws SQLException { | |
| con.rollback(s); | |
| if (reader.getCloseConnection() == true) { | |
| con.close(); | |
| } | |
| } | |
| private void readObject(ObjectInputStream ois) throws IOException, ClassNotFoundException { | |
| // Default state initialization happens here | |
| ois.defaultReadObject(); | |
| // Initialization of Res Bundle happens here . | |
| try { | |
| resBundle = JdbcRowSetResourceBundle.getJdbcRowSetResourceBundle(); | |
| } catch(IOException ioe) { | |
| throw new RuntimeException(ioe); | |
| } | |
| } | |
| static final long serialVersionUID =-8506030970299413976L; | |
| /** | |
| * Validate whether the Primary Key is known to the CachedRowSet. If it is | |
| * not, it is an auto-generated key | |
| * @param pk - Primary Key to validate | |
| * @param rsmd - ResultSetMetadata for the RowSet | |
| * @return true if found, false otherwise (auto generated key) | |
| */ | |
| private boolean isPKNameValid(String pk, ResultSetMetaData rsmd) throws SQLException { | |
| boolean isValid = false; | |
| int cols = rsmd.getColumnCount(); | |
| for(int i = 1; i<= cols; i++) { | |
| String colName = rsmd.getColumnClassName(i); | |
| if(colName.equalsIgnoreCase(pk)) { | |
| isValid = true; | |
| break; | |
| } | |
| } | |
| return isValid; | |
| } | |
| } |