Example of UPDATE
//
// Lapetus Ltd Java Class. Copyright (c) Lapetus Systems Ltd, 2009, 2010.
// -----------------------------------------------------------------------
// This is the intellectual property of Lapetus Systems Ltd, Artemis, Greece.
// --------------------------------------------------------------------------
// www.lapetus-ltd.com, www.lapetus.com.gr, www.lapetus.eu
// -------------------------------------------------------
// $LastChangedRevision: 1190 $
// $LastChangedDate:: 2010-11-17 13:21:35#$
// ----------------------------------------
//
import com.lapetus_ltd._2009.xml.types.*;
import com.lapetus_ltd.api.TLptsMainDatabase;
import com.lapetus_ltd.api.common.TLptsCryptoUtil;
import com.lapetus_ltd.api.common.logger.ILptsLogListener;
import com.lapetus_ltd.api.common.logger.TLptsLog;
import com.lapetus_ltd.api.common.logger.TLptsLogger;
import com.lapetus_ltd.api.db.control.*;
import com.lapetus_ltd.api.db.utils.TLptsDriverLoader;
import com.lapetus_ltd.api.db.xml.types.TLptsDBConnectionType;
import com.lapetus_ltd.api.db.xml.types.TLptsDBUpInsDelSetType;
import com.lapetus_ltd.api.db.xml.types.TLptsDBUpInsDelWhereType;
import com.lapetus_ltd.api.db.xml.types.TLptsDriverType;
import java.sql.ResultSet;
import java.util.ResourceBundle;
//
// Class Description : This class shows an example of programmatic and statement updates to database tables.
//
// The example goes about connecting to two data sources (postgres and mssql) and then updates the first manually (programmatically).
// After the completion of the first rowset (seen at the botton in the rowset listener) the second data source is updated
// from the first (ie the mssql db is updated with data from the postgres db)
//
public class ExampleDataUpdate
{
// we store the IDs as we are working with multiple connections that are interlinked.
// this way we can find the connection after it has successfully connected to the data source.
private String connectionMSSqlId = null;
private String connectionPostgresId = null;
public static void main(String[] args)
{
new ExampleDataUpdate();
}
public ExampleDataUpdate()
{
// required so that the API can function correctly.
TLptsMainDatabase.init();
// register a listener for the logging system.
TLptsLogger.addListener(new ILptsLogListener()
{
public void newLogGenerated(TLptsLog log)
{
if (log.getType().equals(TLptsLogger.LOG_TYPE.ERROR))
System.out.println("LOG ERROR :" + log.getMessage() + " : " + log.getSupportingText() + " : Exception : " + log.getExceptionMessage());
if (log.getType().equals(TLptsLogger.LOG_TYPE.WARNING))
System.out.println("LOG WARNING :" + log.getMessage() + " : " + log.getSupportingText() + " : Exception : " + log.getExceptionMessage());
if (log.getType().equals(TLptsLogger.LOG_TYPE.MESSAGE))
System.out.println("LOG MESSAGE :" + log.getMessage() + " : " + log.getSupportingText() + " : Exception : " + log.getExceptionMessage());
}
});
// register a listener for the connections
TLptsFactoryConnection.addListener(new ConnectionStatementListener());
// register a listener for the rowsets produced
TLptsFactoryRowSet.addListener(new RowSetListener());
// register a listener for the statements
TLptsFactoryStatement.addListener(new UpdateStatementListener());
TLptsDBConnectionType connectionType;
//Connect To PostgreSQL
connectionType = connectToDB("POSTGRESQL_DB");
if (connectionType != null)
{
connectionPostgresId = connectionType.getId();
TLptsFactoryConnection.initiateConnection(connectionType); // This generates another thread!!
}
//Connect To To MS SQL
connectionType = connectToDB("MSSQL_DB");
if (connectionType != null)
{
connectionMSSqlId = connectionType.getId();
TLptsFactoryConnection.initiateConnection(connectionType); // This generates another thread!!
}
// ##############################################################################################################
// See ExampleConnectionUsage.connectToDB for an example of how to connect to other Data Sources
// ##############################################################################################################
}
// ####################################################################################
// C O N N E C T I O N
// ####################################################################################
private TLptsDBConnectionType connectToDB(String title)
{
String driverName = "", dbName = "", userName = "", password = "";
ResourceBundle bundle = ResourceBundle.getBundle("resources"); // we have stored all the database info in this bundle
TLptsDBConnectionType connectionType = new TLptsDBConnectionType();
connectionType.setTitle(title);
if (title.equals("MSSQL_DB"))
{
dbName = bundle.getString("Testing.database.mssql.testdb1");
userName = bundle.getString("Testing.database.mssql.user");
password = bundle.getString("Testing.database.mssql.password");
driverName = "com.microsoft.sqlserver.jdbc.SQLServerDataSource";
}
if (title.equals("POSTGRESQL_DB"))
{
dbName = bundle.getString("Testing.database.postgresql.testdb1");
userName = bundle.getString("Testing.database.postgresql.user");
password = bundle.getString("Testing.database.postgresql.password");
driverName = "org.postgresql.ds.PGSimpleDataSource";
}
XLptsDriverType driver = TLptsDriverLoader.getDriverTypeByClassName(driverName);
if (driver == null)
{
System.out.println("Could not find driver for class " + driverName);
return null;
}
TLptsDriverType driverType = new TLptsDriverType(driver);
// changing values that are default in the driver.loader.xml file.
// the DB is now set correctly and will filter through to the Datasource interface execution
if (!title.equals("ACCESS_DB"))
driverType.setValueForInterfaceFunctionParameter("setDatabaseName", "Database Name", dbName);
connectionType.setDriverType(driverType);
if (userName == null || password == null)
connectionType.setCredentials(TLptsCryptoUtil.defaultEncryptCredentialsRSA(driverType.getGuestUser(),
driverType.getGuestPassword()));
else
connectionType.setCredentials(TLptsCryptoUtil.defaultEncryptCredentialsRSA(userName, password));
return connectionType;
}
// we are going to programmatically update the "occupation" to "Software Developer" for all males (Gender='M')
private void postgresqlSimpleUpdate(TLptsConnection connection)
{
TLptsStatement updateStatement = new TLptsStatement(connection, XLptsDBTypeOfStatementType.UPDATE);
//The resultSet should be Scroll Sensitive. MS SQL does not support scroll insensitive or forward only for update
//data. Access supports scroll sensitive but not forward only.
updateStatement.setXResultSetType(ResultSet.TYPE_SCROLL_SENSITIVE);
updateStatement.setXResultSetConcurrency(ResultSet.CONCUR_UPDATABLE);
XLptsDBStatementTableType table = updateStatement.getTableItemByName("testTable");
table.setSelected(true);
XLptsDBStatementColumnType colX = updateStatement.getColumnItemByName(table.getTableName(), "Occupation");
if (colX != null)
{
// Now we have to set the update parameters for this column
// If we are going to update the row values of this column we have to set the required TLptsDBUpInsDelSetType parameters
TLptsDBUpInsDelSetType setType = new TLptsDBUpInsDelSetType(XLptsDBUpInsDelSourceType.PROGRAMMATIC, "Software Developer");
colX.setUpInsDelParameterItem(setType);
// If we want the db-JAPI to handle the column as another SQL Type we can set this type to this parameters like:
// colX.getUpInsDelParameterItem().setSqlSubstituteType(java.sql.Types.BINARY);
// Note the following when it comes to updating STRING values in different types of data sources:
// 1. Access requires the setCharset as it cannot update STRING values directly.
// 2. PostgreSQL and MySQL support direct update of the string values, without setting the charset.
// 3. MS SQL has two types of strings, n-type (nvarchar etc) and simple types (varchar etc.). N-types
// requires the setCharset(), but the normal char does not require it.
// colX.getUpInsDelParameterItem().setCharset("windows-1253");
}
colX = updateStatement.getColumnItemByName(table.getTableName(), "Gender");
if (colX != null)
{
TLptsDBUpInsDelWhereType whereType = new TLptsDBUpInsDelWhereType(XLptsDBUpInsDelSourceType.PROGRAMMATIC, "M");
whereType.setOperation(TLptsFactoryStatement.OPERATION_EQUAL);
whereType.setAndConnector(true);
colX.setUpInsDelParameterItem(whereType);
}
updateStatement.setTitle("Update Statement");
System.out.println("SQL Statement " + updateStatement.getTitle() + ": " + updateStatement.getSqlStatementFormatted());
TLptsFactoryRowSet.executeDynamicUpdate(updateStatement);
}
// This time we will update the "occupation" column with data from the 'Occupation' SELECT Statement.
// The rows that will be updated are those with value that are in the "ID" SELECT Statement.
private void mssqlDynamicUpdate()
{
TLptsConnection postgresqlConnection = TLptsFactoryConnection.getConnection(connectionPostgresId);
if (postgresqlConnection == null)
return;
selectDataStatements(postgresqlConnection, "testTable", "ID");
selectDataStatements(postgresqlConnection, "testTable", "Occupation");
TLptsConnection connection = TLptsFactoryConnection.getConnection(connectionMSSqlId);
if (connection == null)
return;
TLptsStatement updateStatement = new TLptsStatement(connection, XLptsDBTypeOfStatementType.UPDATE);
updateStatement.setXResultSetType(ResultSet.TYPE_SCROLL_SENSITIVE);
updateStatement.setXResultSetConcurrency(ResultSet.CONCUR_UPDATABLE);
XLptsDBStatementTableType table = updateStatement.getTableItemByName("testTable");
table.setSelected(true);
XLptsDBStatementColumnType colX;
colX = updateStatement.getColumnItemByName(table.getTableName(), "Occupation");
// UPDATE
if (colX != null)
{
TLptsDBUpInsDelSetType setType = new TLptsDBUpInsDelSetType(XLptsDBUpInsDelSourceType.LPTS_STATEMENT, "Occupation");
colX.setUpInsDelParameterItem(setType);
colX.getUpInsDelParameterItem().setCharset("UTF-16LE");
}
// WHERE CRITERIA
colX = updateStatement.getColumnItemByName(table.getTableName(), "ID");
if (colX != null)
{
TLptsDBUpInsDelWhereType whereType = new TLptsDBUpInsDelWhereType(XLptsDBUpInsDelSourceType.LPTS_STATEMENT, "ID");
whereType.setOperation(TLptsFactoryStatement.OPERATION_EQUAL);
whereType.setAndConnector(true);
colX.setUpInsDelParameterItem(whereType);
}
updateStatement.setTitle("Update Statement");
System.out.println("SQL Statement " + updateStatement.getTitle() + ": " + updateStatement.getSqlStatementFormatted());
TLptsFactoryRowSet.executeDynamicUpdate(updateStatement); // executes a separate thread
}
// this creates the OCCUPATION and ID Statements to be used by the dynamic update.
private void selectDataStatements(TLptsConnection connection, String tableName, String columnName)
{
TLptsStatement statement = new TLptsStatement(connection, XLptsDBTypeOfStatementType.SELECT);
XLptsDBStatementTableType table = statement.getTableItemByName(tableName);
table.setSelected(true);
// another way to select a column
for (XLptsDBStatementColumnType column : statement.getColumnItemsForTable(table.getTableName()))
if (column.getColumnName().equals(columnName))
column.setSelected(true);
statement.getCriteriaType().setType(XLptsDBCriteriaType.NONE);
statement.setTitle(columnName);
System.out.println("SQL Statement " + statement.getTitle() + ": " + statement.getSqlStatementFormatted());
TLptsFactoryStatement.createNewStatement(connection, statement);
}
// ###############################################################################################################
// #### C O N N E C T I O N L I S T E N E R
// ###############################################################################################################
private class ConnectionStatementListener implements ILptsFactoryConnectionListener
{
public synchronized void newConnectionCreated(TLptsConnection connection)
{
System.out.println("New Connection created successfully. Statements can be processed.");
if (connection.getId().equals(connectionPostgresId))
postgresqlSimpleUpdate(connection); // performs the simple update
}
public void newConnectionProcessStarted()
{
System.out.println("Connecting...");
}
public void newConnectionFailed(TLptsLog log)
{
System.out.println("New Connection Failed. The logger got this.");
}
public void removedAndClosedConnection(TLptsConnection connection)
{
System.out.println("Connection removed from Connection Manager and closed successfully ... " + connection.getTitle());
}
}
// ###############################################################################################################
// #### S T A T E M E N T L I S T E N E R
// ###############################################################################################################
private class UpdateStatementListener implements ILptsFactoryStatementListener
{
public void newStatementProcessStarted(TLptsConnection connection)
{
}
public void newStatementCreated(TLptsConnection connection, TLptsStatement statement)
{
if (statement.getTypeOfStatement() == XLptsDBTypeOfStatementType.SELECT)
TLptsLogger.logMessage("Select Statement created for connection " + connection.getTitle(), null);
}
public void newStatementFailed(TLptsConnection connection)
{
TLptsLogger.logError("Fail to Create Statement for connection " + connection.getTitle(), null);
}
public void removedAndClosedStatement(TLptsConnection connection, TLptsStatement statement)
{
}
}
// ###############################################################################################################
// #### R O W S E T L I S T E N E R
// ###############################################################################################################
private class RowSetListener implements ILptsFactoryRowSetListener
{
public void rowEvent(TLptsRowEvent rowEvent)
{
}
public boolean processNewRowSetRows(TLptsRowSetEvent rowSetEvent)
{
if (rowSetEvent.getEventType() == TLptsRowSetEvent.EVENT_TYPE.UPDATE_COMPLETE)
{
try
{
System.out.println("Statement " + rowSetEvent.getStatement().getTitle() + " " +
((TLptsConnection) rowSetEvent.getStatement().getConnection()).getTitle() +
" update execution complete...");
System.out.println(rowSetEvent.getRows() + " rows updated, " + rowSetEvent.getObjects() + " objects updated");
if (rowSetEvent.getRowSetsNotFinished().isEmpty())
System.out.println("All row sets were updated uniformly.");
else
for (String rowSet : rowSetEvent.getRowSetsNotFinished())
System.out.println(rowSet + " did not complete it's whole data set.");
// now we can kick off the update of the dynamic data after the postgres db has been updated
if (((TLptsConnection) rowSetEvent.getStatement().getConnection()).getId().equals(connectionPostgresId))
mssqlDynamicUpdate();
} catch (Exception e)
{
TLptsLogger.logError("Cannot get Connection Name", e);
}
}
return true;
}
}
}