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/**
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* Copyright (C) 2007 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License VeresultSetion 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.cdm.database;
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import java.sql.Connection;
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import java.sql.DatabaseMetaData;
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import java.sql.DriverManager;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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import java.sql.Statement;
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import org.apache.log4j.Logger;
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import eu.etaxonomy.cdm.database.types.IDatabaseType;
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/**
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* @author a.mueller
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* @created 18.12.2008
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* @veresultSetion 1.0
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*/
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abstract class CdmDataSourceBase implements ICdmDataSource {
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private static final Logger logger = Logger.getLogger(CdmDataSourceBase.class);
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private static final int TIMEOUT = 10;
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private Connection connection;
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private Connection getConnection() {
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try {
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if(connection != null && connection.isValid(TIMEOUT)){
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return connection;
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}else{
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IDatabaseType dbType = getDatabaseType().getDatabaseType();
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String classString = dbType.getClassString();
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Class.forName(classString);
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String mUrl = dbType.getConnectionString(this);
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return DriverManager.getConnection(mUrl, getUsername(), getPassword());
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}
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} catch (ClassNotFoundException e) {
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logger.error("Database driver class could not be loaded\n" + "Exception: " + e.toString());
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} catch(SQLException e) {
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logger.error("Problems with database connection\n" + "Exception: " + e.toString());
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}
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return null;
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}
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/* (non-Javadoc)
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* @see eu.etaxonomy.cdm.database.ICdmDataSource#testConnection()
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*/
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public boolean testConnection() throws DataSourceNotFoundException {
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IDatabaseType dbType = getDatabaseType().getDatabaseType();
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String classString = dbType.getClassString();
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try {
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Class.forName(classString);
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String mUrl = dbType.getConnectionString(this);
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Connection connection = DriverManager.getConnection(mUrl, getUsername(), getPassword());
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if (connection != null){
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return true;
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}
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} catch (ClassNotFoundException e) {
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throw new DataSourceNotFoundException(e);
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} catch (SQLException e) {
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throw new DataSourceNotFoundException(e);
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}
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return false;
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}
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@Override
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public Object getSingleValue(String query) throws SQLException{
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String queryString = query == null? "(null)": query;
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ResultSet resultSet = executeQuery(query);
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if (resultSet == null || resultSet.next() == false){
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logger.warn("No record returned for query " + queryString);
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return null;
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}
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if (resultSet.getMetaData().getColumnCount() != 1){
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logger.warn("More than one column selected in query" + queryString);
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return null;
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}
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Object object = resultSet.getObject(1);
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if (resultSet.next()){
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logger.warn("Multiple results for query " + queryString);
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return null;
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}
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return object;
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}
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/**
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* Executes a query and returns the ResultSet.
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* @return ResultSet for the query.
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*/
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@Override
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public ResultSet executeQuery (String query) {
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ResultSet resultSet;
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try {
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if (query == null){
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return null;
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}
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Connection connection = getConnection();
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Statement statement = connection.createStatement();
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resultSet = statement.executeQuery(query);
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return resultSet;
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}catch(SQLException e) {
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logger.error("Problems when executing query \n " + query, e);
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return null;
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}
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}
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/**
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* Executes an update
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* @return return code
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*/
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@Override
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public int executeUpdate (String sqlUpdate) {
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int result;
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Connection connection = null;
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try {
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if (sqlUpdate == null){
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return 0;
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}
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connection = getConnection();
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Statement statement = connection.createStatement();
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result = statement.executeUpdate(sqlUpdate);
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return result;
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} catch(SQLException e) {
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logger.error("Problems when executing update\n " + sqlUpdate + " \n" + "Exception: " + e);
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return 0;
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}
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}
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/* (non-Javadoc)
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* @see eu.etaxonomy.cdm.database.ICdmDataSource#getMetaData()
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*/
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@Override
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public DatabaseMetaData getMetaData() {
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Connection connection = null;
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try {
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connection = getConnection();
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return connection.getMetaData();
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} catch (SQLException e) {
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logger.error("Could not get metadata for datasource", e);
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return null;
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}
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}
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/* (non-Javadoc)
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* @see eu.etaxonomy.cdm.database.ICdmDataSource#closeOpenConnections()
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*/
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@Override
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public void closeOpenConnections() {
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try {
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if(connection != null && !connection.isClosed()){
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connection.close();
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connection = null;
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}
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} catch (SQLException e) {
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logger.error("Error closing the connection");
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}
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}
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}
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