Java Code Examples for com.mchange.v2.c3p0.ComboPooledDataSource#setMaxPoolSize()

public static void initPool(Properties pro) throws Exception {
	String jdbcUrl = getJdbcUrl(pro);
	String userName = trimToNull(pro, JdbcConst.MYSQL_USER_NAME);
	String password = trimToNull(pro, JdbcConst.MYSQL_PASSWORD);

	cpds = new ComboPooledDataSource();
	cpds.setDriverClass(MYSQL_JDBC_DRIVER); // loads the jdbc driver
	cpds.setJdbcUrl(jdbcUrl);
	cpds.setUser(userName);
	cpds.setPassword(password);
	int inititalSize = Integer.valueOf(trimToNull(pro, JdbcConst.MYSQL_INITIAL_SIZE, "10"));
	int maxSize = Integer.valueOf(trimToNull(pro, JdbcConst.MYSQL_MAX_SIZE, "100"));
	cpds.setInitialPoolSize(inititalSize);// 初始创建默认10个连接
	cpds.setMaxPoolSize(maxSize);// 最大默认100个
	int inc = (maxSize - inititalSize) / 5;
	cpds.setAcquireIncrement(Integer.max(1, inc));// 每次创建10个

	int maxIdle = Integer.valueOf(trimToNull(pro, JdbcConst.MYSQL_MAX_IDLE, "60"));
	cpds.setMaxIdleTime(maxIdle);// 最大空闲时间
	
	SqlLog.info("windchat init mysql master connection pool cpds={}", cpds);
}
 

private ComboPooledDataSource getComboPooledDataSource(String host, int port, String database, String user,
                                                       String password, String applicationName, int maxPostgreSQLConnections) {
    final ComboPooledDataSource cpds = new ComboPooledDataSource();

    cpds.setJdbcUrl(
            String.format("jdbc:postgresql://%1$s:%2$d/%3$s?ApplicationName=%4$s&tcpKeepAlive=true", host, port, database, applicationName));

    cpds.setUser(user);
    cpds.setPassword(password);

    cpds.setInitialPoolSize(1);
    cpds.setMinPoolSize(1);
    cpds.setAcquireIncrement(1);
    cpds.setMaxPoolSize(maxPostgreSQLConnections);
    cpds.setCheckoutTimeout( CONNECTION_CHECKOUT_TIMEOUT_SECONDS * 1000 );
    cpds.setConnectionCustomizerClassName(DatabaseHandler.XyzConnectionCustomizer.class.getName());
    return cpds;
}
 

public static ComboPooledDataSource createDataSource(Properties props) {
    try {
        final String jdbcUrl = trim(props.getProperty(ConfigParameter.DS_JDBC_URL.getKey()));
        final String user = trim(props.getProperty(ConfigParameter.DS_USER.getKey()));
        final String password = trim(props.getProperty(ConfigParameter.DS_PASSWORD.getKey()));
        final String driverClass = trim(props.getProperty(ConfigParameter.DS_DRIVER_CLASS.getKey()));
        final int minPoolSize = Integer.valueOf(props.getProperty(ConfigParameter.DS_MIN_POOL_SIZE.getKey(), Integer.toString(Runtime.getRuntime().availableProcessors())));
        final int maxPoolSize = Integer.valueOf(props.getProperty(ConfigParameter.DS_MAX_POOL_SIZE.getKey(), Integer.toString(2 * Runtime.getRuntime().availableProcessors())));
        ComboPooledDataSource ds = new ComboPooledDataSource();
        ds.setJdbcUrl(jdbcUrl.replace("${NOW}", Long.toString(System.currentTimeMillis())));
        if (!isNullOrEmpty(user))
            ds.setUser(user);
        if (!isNullOrEmpty(password))
            ds.setPassword(password);
        if (!isNullOrEmpty(driverClass))
            ds.setDriverClass(driverClass);
        ds.setMinPoolSize(minPoolSize);
        ds.setInitialPoolSize(minPoolSize);
        ds.setMaxPoolSize(maxPoolSize);
        return ds;
    } catch (Exception e) {
        throw new RuntimeException("Unable to create datasource", e);
    }
}
 

@Bean
@Primary
public DataSource dataSource() throws PropertyVetoException {
    ComboPooledDataSource rlt = new ComboPooledDataSource();
    rlt.setDriverClass("com.mysql.jdbc.Driver");
    rlt.setUser("root");
    rlt.setPassword("password");
    rlt.setJdbcUrl("jdbc:mysql://localhost:3306/libevent_sample");
    rlt.setInitialPoolSize(DEFAULT_POOL_SIZE);
    rlt.setMaxPoolSize(DEFAULT_POOL_SIZE);
    rlt.setMinPoolSize(DEFAULT_POOL_SIZE);
    rlt.setTestConnectionOnCheckin(true);
    rlt.setPreferredTestQuery("select 1");

    return rlt;
}
 

@Bean
@Primary
public DataSource dataSource() throws PropertyVetoException {
    ComboPooledDataSource rlt = new ComboPooledDataSource();
    rlt.setDriverClass("com.mysql.jdbc.Driver");
    rlt.setUser("root");
    rlt.setPassword("password");
    rlt.setJdbcUrl("jdbc:mysql://localhost:3306/libevent_sample");
    rlt.setInitialPoolSize(DEFAULT_POOL_SIZE);
    rlt.setMaxPoolSize(DEFAULT_POOL_SIZE);
    rlt.setMinPoolSize(DEFAULT_POOL_SIZE);
    rlt.setTestConnectionOnCheckin(true);
    rlt.setPreferredTestQuery("select 1");

    return rlt;
}
 

protected PooledDataSource createDataSource() {
	logger.info("Creating the data source with the configuration {}", configuration);
	if (configuration == null) {
		logger.error("Database configuration is not set");
		throw new MinnalException("Database configuration is not set");
	}
	ComboPooledDataSource dataSource = new ComboPooledDataSource();
	try {
		Class.forName(configuration.getDriverClass());
		dataSource.setJdbcUrl(configuration.getUrl());
		dataSource.setUser(configuration.getUsername());
		dataSource.setPassword(configuration.getPassword());
		dataSource.setIdleConnectionTestPeriod(configuration.getIdleConnectionTestPeriod());
		dataSource.setInitialPoolSize(configuration.getMinSize());
		dataSource.setMaxPoolSize(configuration.getMaxSize());
	} catch (Exception e) {
		logger.error("Failed while creating the data source", e);
		throw new MinnalException("Failed while configuring the data source", e);
	}
	return dataSource;
}
 

/**
 * {@inheritDoc }
 */
@Override
public void init( Map<String, String> htParamsConnectionPool )
{
    try
    {
        _dataSource = new ComboPooledDataSource( _strPoolName );

        String strDriver = htParamsConnectionPool.get( getPoolName( ) + ".driver" );
        _dataSource.setDriverClass( strDriver );

        String strUrl = htParamsConnectionPool.get( getPoolName( ) + ".url" );
        strUrl = EnvUtil.evaluate( strUrl, EnvUtil.PREFIX_ENV );
        _dataSource.setJdbcUrl( strUrl );

        String strUser = htParamsConnectionPool.get( getPoolName( ) + ".user" );
        strUser = EnvUtil.evaluate( strUser, EnvUtil.PREFIX_ENV );
        _dataSource.setUser( strUser );

        String strPassword = htParamsConnectionPool.get( getPoolName( ) + ".password" );
        strPassword = EnvUtil.evaluate( strPassword, EnvUtil.PREFIX_ENV );
        _dataSource.setPassword( strPassword );

        String strMaxConns = htParamsConnectionPool.get( getPoolName( ) + ".maxconns" );
        int nMaxConns = ( strMaxConns == null ) ? 0 : Integer.parseInt( strMaxConns );
        _dataSource.setMaxPoolSize( nMaxConns );

        String strMinConns = htParamsConnectionPool.get( getPoolName( ) + ".initconns" );
        int nInitConns = ( strMinConns == null ) ? 0 : Integer.parseInt( strMinConns );
        _dataSource.setInitialPoolSize( nInitConns );
        _dataSource.setMinPoolSize( nInitConns );
    }
    catch( Exception e )
    {
        _logger.error( "Error while initializing the pool " + getPoolName( ), e );
    }

    _logger.info( "Initialization of the C3P0 pool named '" + getPoolName( ) + "', Min/Max pool size : " + _dataSource.getMinPoolSize( ) + "/"
            + _dataSource.getMaxPoolSize( ) );
}
 

public static void initPool(Properties pro) throws Exception {
	List<String> jdbcUrlList = getSlaveJdbcUrl(pro);

	String userName = trimToNull(pro, JdbcConst.MYSQL_SLAVE_USER_NAME);
	String password = trimToNull(pro, JdbcConst.MYSQL_SLAVE_PASSWORD);

	if (jdbcUrlList == null || jdbcUrlList.size() == 0 || StringUtils.isAnyEmpty(userName, password)) {
		SqlLog.warn(
				"load database slave for mysql fail, system will user mysql master connection pool.urls={} user={} passwd={}",
				jdbcUrlList, userName, password);
		return;
	}

	cpdsList = new ArrayList<ComboPooledDataSource>();

	for (String jdbcUrl : jdbcUrlList) {
		ComboPooledDataSource cpds = new ComboPooledDataSource();
		cpds.setDriverClass(MYSQL_JDBC_DRIVER); // loads the jdbc driver
		cpds.setJdbcUrl(jdbcUrl);
		cpds.setUser(userName);
		cpds.setPassword(password);
		int inititalSize = Integer.valueOf(trimToNull(pro, JdbcConst.MYSQL_SLAVE_INITIAL_SIZE, "10"));
		int maxSize = Integer.valueOf(trimToNull(pro, JdbcConst.MYSQL_SLAVE_MAX_SIZE, "100"));
		cpds.setInitialPoolSize(inititalSize);// 初始创建默认10个连接
		cpds.setMaxPoolSize(maxSize);// 最大默认100个
		int inc = (maxSize - inititalSize) / 5;
		cpds.setAcquireIncrement(Integer.max(1, inc));// 每次创建个数

		int maxIdle = Integer.valueOf(trimToNull(pro, JdbcConst.MYSQL_SLAVE_MAX_IDLE, "60"));
		cpds.setMaxIdleTime(maxIdle);// 最大空闲时间

		cpdsList.add(cpds);

		SqlLog.info("windchat init mysql slave connection pool cpds={}", cpds.toString());
	}
}
 

protected DAOFactory(String facName, String driverClassName, String jdbcURL, String userName, String userPassword,
        int initPoolSize, int MinPoolSize, int MaxPoolSize, int maxIdleTime, int idleConnectionTestPeriod,
        String testQuerySQL) {

    this.facName = facName;

    ds = new ComboPooledDataSource();
    // 设置JDBC的Driver类
    try {
        ds.setDriverClass(driverClassName);
    }
    catch (PropertyVetoException e) {
        throw new RuntimeException(e);
    }
    // 设置JDBC的URL
    ds.setJdbcUrl(jdbcURL);
    // 设置数据库的登录用户名
    ds.setUser(userName);
    // 设置数据库的登录用户密码
    ds.setPassword(userPassword);
    // 设置连接池的最大连接数
    ds.setMaxPoolSize(MaxPoolSize);
    // 设置连接池的最小连接数
    ds.setMinPoolSize(MinPoolSize);
    // 设置初始化连接数
    ds.setInitialPoolSize(initPoolSize);
    // 设置最大闲置时间
    ds.setMaxIdleTime(maxIdleTime);
    // 设置测试SQL
    ds.setPreferredTestQuery(testQuerySQL);
    // 设置闲置测试周期
    ds.setIdleConnectionTestPeriod(idleConnectionTestPeriod);
    // 增加单个连接的Statements数量
    ds.setMaxStatements(0);
    // 连接池内单个连接所拥有的最大缓存statements数
    ds.setMaxStatementsPerConnection(200);
    // 获取空闲连接超时时间
    ds.setCheckoutTimeout(10 * 1000);
}
 

private ComboPooledDataSource createConnectionPool() throws PropertyVetoException {
	ComboPooledDataSource ds = new ComboPooledDataSource();

	ds.setDriverClass(jdbcDriver);
	ds.setJdbcUrl(url);
	ds.setUser(username);
	ds.setPassword(password);
	ds.setMinPoolSize(5);
	ds.setAcquireIncrement(5);
	ds.setMaxPoolSize(maxPoolSize);

	return ds;
}
 

private DataSource createDataSource(String driverClass, String url, String account, String password) {
	ComboPooledDataSource dataSource = new ComboPooledDataSource();
	try {
		dataSource.setDriverClass(driverClass);
		dataSource.setJdbcUrl(url);
		dataSource.setUser(account);
		dataSource.setPassword(password);

		dataSource.setMinPoolSize(10);
		dataSource.setMaxPoolSize(35);
		dataSource.setAcquireIncrement(0);
		dataSource.setMaxStatements(0);
		
		/** 最大允許的閒置時間(秒) */
		dataSource.setMaxIdleTime(300);
		/** 對閒置的連線進行Query測試設置(秒) */
		dataSource.setIdleConnectionTestPeriod(1800);
		
		/** Checkin connection時不檢查連線是否有效 */
		dataSource.setTestConnectionOnCheckin(false);
		/** Checkout connection時檢查連線的有效性*/
		dataSource.setTestConnectionOnCheckout(true);
		/** 進行test時使用的 Query設定*/
		dataSource.setPreferredTestQuery("SELECT 1;");
		/** Connection的最大有效時數(秒)*/
		dataSource.setMaxConnectionAge(28800);
		/** Connection checkout 之後的有效時數(毫秒)*/
		dataSource.setCheckoutTimeout(28800000);
	} catch (PropertyVetoException e) {
		e.printStackTrace();
	}
	mPoolMap.put(url, dataSource);
	return dataSource;
}
 

public static void initPool(Properties pro) throws Exception {
	List<String> jdbcUrlList = getSlaveDBUrl(pro);

	String userName = trimToNull(pro, JdbcConst.MYSQL_SLAVE_USER_NAME);
	String password = trimToNull(pro, JdbcConst.MYSQL_SLAVE_PASSWORD);

	if (jdbcUrlList == null || jdbcUrlList.size() == 0 || StringUtils.isAnyEmpty(userName, password)) {
		SqlLog.warn(
				"load database slave for mysql fail, system will user mysql master connection pool.urls={} user={} passwd={}",
				jdbcUrlList, userName, password);
		return;
	}

	cpdsList = new ArrayList<ComboPooledDataSource>();

	for (String jdbcUrl : jdbcUrlList) {
		ComboPooledDataSource cpds = new ComboPooledDataSource();
		cpds.setDriverClass(MYSQL_JDBC_DRIVER); // loads the jdbc driver
		cpds.setJdbcUrl(jdbcUrl);
		cpds.setUser(userName);
		cpds.setPassword(password);
		int inititalSize = Integer.valueOf(trimToNull(pro, JdbcConst.MYSQL_SLAVE_INITIAL_SIZE, "10"));
		int maxSize = Integer.valueOf(trimToNull(pro, JdbcConst.MYSQL_SLAVE_MAX_SIZE, "100"));
		cpds.setInitialPoolSize(inititalSize);// 初始创建默认10个连接
		cpds.setMaxPoolSize(maxSize);// 最大默认100个
		int inc = (maxSize - inititalSize) / 5;
		cpds.setAcquireIncrement(Integer.max(1, inc));// 每次创建个数

		int maxIdle = Integer.valueOf(trimToNull(pro, JdbcConst.MYSQL_SLAVE_MAX_IDLE, "60"));
		cpds.setMaxIdleTime(maxIdle);// 最大空闲时间

		cpdsList.add(cpds);

		SqlLog.info("openzaly init mysql slave connection pool cpds={}", cpds.toString());
	}
}
 

public static DataSource loadDB(String dbID, Settings settings) throws Throwable {
    // 1.获取数据库连接配置信息
    String driverString = settings.getString(dbID + ".driver");
    String urlString = settings.getString(dbID + ".url");
    String userString = settings.getString(dbID + ".user");
    String pwdString = settings.getString(dbID + ".password");
    // 2.创建数据库连接池
    int poolMaxSize = 40;
    logger.info("C3p0 Pool Info maxSize is ‘%s’ driver is ‘%s’ jdbcUrl is‘%s’", poolMaxSize, driverString, urlString);
    ComboPooledDataSource dataSource = new ComboPooledDataSource();
    dataSource.setDriverClass(driverString);
    dataSource.setJdbcUrl(urlString);
    dataSource.setUser(userString);
    dataSource.setPassword(pwdString);
    dataSource.setMaxPoolSize(poolMaxSize);
    dataSource.setInitialPoolSize(1);
    // dataSource.setAutomaticTestTable("DB_TEST_ATest001");
    dataSource.setIdleConnectionTestPeriod(18000);
    dataSource.setCheckoutTimeout(3000);
    dataSource.setTestConnectionOnCheckin(true);
    dataSource.setAcquireRetryDelay(1000);
    dataSource.setAcquireRetryAttempts(30);
    dataSource.setAcquireIncrement(1);
    dataSource.setMaxIdleTime(25000);
    // 3.启用默认事务拦截器
    return dataSource;
}
 

public static DataSource getDataSource () throws PropertyVetoException {
    ComboPooledDataSource cpds = new ComboPooledDataSource();
    cpds.setDriverClass("com.mysql.jdbc.Driver"); //loads the jdbc driver
    cpds.setJdbcUrl("jdbc:mysql://localhost/lightning?user=root");

    // the settings below are optional -- c3p0 can work with defaults
    cpds.setMinPoolSize(2);
    cpds.setAcquireIncrement(5);
    cpds.setMaxPoolSize(8);

    return cpds;
}
 

public static void initPool(Properties pro) throws Exception {
	List<String> jdbcUrlList = getSlaveJdbcUrl(pro);

	String userName = trimToNull(pro, JdbcConst.MYSQL_SLAVE_USER_NAME);
	String password = trimToNull(pro, JdbcConst.MYSQL_SLAVE_PASSWORD);

	if (jdbcUrlList == null || jdbcUrlList.size() == 0 || StringUtils.isAnyEmpty(userName, password)) {
		SqlLog.warn(
				"load database slave for mysql fail, system will user mysql master connection pool.urls={} user={} passwd={}",
				jdbcUrlList, userName, password);
		return;
	}

	cpdsList = new ArrayList<ComboPooledDataSource>();

	for (String jdbcUrl : jdbcUrlList) {
		ComboPooledDataSource cpds = new ComboPooledDataSource();
		cpds.setDriverClass(MYSQL_JDBC_DRIVER); // loads the jdbc driver
		cpds.setJdbcUrl(jdbcUrl);
		cpds.setUser(userName);
		cpds.setPassword(password);
		int inititalSize = Integer.valueOf(trimToNull(pro, JdbcConst.MYSQL_SLAVE_INITIAL_SIZE, "10"));
		int maxSize = Integer.valueOf(trimToNull(pro, JdbcConst.MYSQL_SLAVE_MAX_SIZE, "100"));
		cpds.setInitialPoolSize(inititalSize);// 初始创建默认10个连接
		cpds.setMaxPoolSize(maxSize);// 最大默认100个
		int inc = (maxSize - inititalSize) / 5;
		cpds.setAcquireIncrement(Integer.max(1, inc));// 每次创建个数

		int maxIdle = Integer.valueOf(trimToNull(pro, JdbcConst.MYSQL_SLAVE_MAX_IDLE, "60"));
		cpds.setMaxIdleTime(maxIdle);// 最大空闲时间

		cpdsList.add(cpds);

		SqlLog.info("openzaly init mysql slave connection pool cpds={}", cpds.toString());
	}
}
 

@Test
public void testC3p0() throws Exception {
  ComboPooledDataSource dataSource = new ComboPooledDataSource();
  dataSource.setMinPoolSize(this.corePoolSize);
  dataSource.setMaxPoolSize(this.maxPoolSize);
  dataSource.setDriverClass(this.driverClassName);
  dataSource.setJdbcUrl(this.url);
  dataSource.setUser(this.username);
  dataSource.setPassword(this.password);
  for (int i = 0; i < this.loop; ++i) {
    ThreadProcessUtils.process(dataSource, "c3p0", this.count, threadCount, physicalCon);
  }
  System.out.println();
}
 

@SuppressWarnings("unchecked")
private static void setupDataSource(Isolation isolation) {
  ds = new ComboPooledDataSource();
  Endpoint locatorEndPoint = (Endpoint) (NetworkServerHelper.getNetworkLocatorEndpoints()).get(0);
  String hostname = getHostNameFromEndpoint(locatorEndPoint);
  int port = getPortFromEndpoint(locatorEndPoint); 
  
  connProp.putAll(getExtraConnProp()); //singlehop conn properties and any additional prop
  
  try {
    ds.setProperties(connProp); 
    ds.setDriverClass(driver);
    ds.setJdbcUrl(protocol + hostname+ ":" + port);
    
    ds.setMinPoolSize(5);
    ds.setAcquireIncrement(5);
    ds.setMaxPoolSize(numOfWorkers + 100);
    ds.setMaxStatementsPerConnection(10);
    
    if (isolation == Isolation.NONE) {
      ds.setConnectionCustomizerClassName( "sql.sqlutil.MyConnectionCustomizer");
    } else if (isolation == Isolation.READ_COMMITTED) {
      ds.setConnectionCustomizerClassName("sql.sqlutil.IsolationRCConnectionCustomizer");
    } else {
      ds.setConnectionCustomizerClassName("sql.sqlutil.IsolationRRConnectionCustomizer");
    }
    
    Log.getLogWriter().info("Pooled data source url is set as " + ds.getJdbcUrl());
    
    StringBuilder sb = new StringBuilder();
    
    for (Iterator iter = connProp.entrySet().iterator(); iter.hasNext(); ) {
      Map.Entry<String, String> entry = (Map.Entry<String, String>) iter.next();
      
      sb.append(entry.getKey() + " is set to " + entry.getValue() +"\n");
    }
    
    Log.getLogWriter().info("Pooled data source setting the following connection prop: " + sb.toString());
    
  } catch (Exception e) {
    throw new TestException("could not set data source" + TestHelper.getStackTrace(e));
  }
}
 

public void testPooling(CloudSpannerConnection original)
    throws SQLException, PropertyVetoException, InterruptedException {
  log.info("Starting connection pooling tests");
  ComboPooledDataSource cpds = new ComboPooledDataSource();
  cpds.setDriverClass("nl.topicus.jdbc.CloudSpannerDriver");
  cpds.setJdbcUrl(original.getUrl());
  cpds.setProperties(original.getSuppliedProperties());

  cpds.setInitialPoolSize(5);
  cpds.setMinPoolSize(5);
  cpds.setAcquireIncrement(5);
  cpds.setMaxPoolSize(20);
  cpds.setCheckoutTimeout(1000);

  log.info("Connection pool created and configured. Acquiring connection from pool");
  Assert.assertEquals(0, cpds.getNumBusyConnectionsDefaultUser());
  Connection connection = cpds.getConnection();
  Assert.assertNotNull(connection);
  Assert.assertEquals(1, cpds.getNumBusyConnectionsDefaultUser());
  connection.close();
  while (cpds.getNumBusyConnections() == 1) {
    TimeUnit.MILLISECONDS.sleep(100L);
  }
  Assert.assertEquals(0, cpds.getNumBusyConnectionsDefaultUser());

  log.info("About to acquire 10 connections");
  Connection[] connections = new Connection[10];
  for (int i = 0; i < connections.length; i++) {
    connections[i] = cpds.getConnection();
    Assert.assertEquals(i + 1, cpds.getNumBusyConnectionsDefaultUser());
  }
  log.info("10 connections acquired, closing connections...");
  for (int i = 0; i < connections.length; i++) {
    connections[i].close();
  }
  log.info("10 connections closed");
  log.info("Acquiring 20 connections");
  // Check that we can get 20 connections
  connections = new Connection[20];
  for (int i = 0; i < connections.length; i++) {
    connections[i] = cpds.getConnection();
    connections[i].prepareStatement("SELECT 1").executeQuery();
  }
  log.info("20 connections acquired, trying to get one more");
  // Verify that we can't get a connection now
  connection = null;
  try {
    connection = cpds.getConnection();
  } catch (SQLException e) {
    // timeout exception
    log.info("Exception when trying to get one more connection (this is expected)");
  }
  log.info("Closing 20 connections");
  Assert.assertNull(connection);
  for (int i = 0; i < connections.length; i++) {
    connections[i].close();
  }
  log.info("Closing connection pool");
  cpds.close();
  log.info("Finished tests");
}
 

public L2DatabaseFactory() throws SQLException
{
	try
	{
		if (Config.DATABASE_MAX_CONNECTIONS < 2)
           {
               Config.DATABASE_MAX_CONNECTIONS = 2;
               _log.warning("at least " + Config.DATABASE_MAX_CONNECTIONS + " db connections are required.");
           }

		_source = new ComboPooledDataSource();
		_source.setAutoCommitOnClose(true);

		_source.setInitialPoolSize(10);
		_source.setMinPoolSize(10);
		_source.setMaxPoolSize(Config.DATABASE_MAX_CONNECTIONS);

		_source.setAcquireRetryAttempts(0); // try to obtain connections indefinitely (0 = never quit)
		_source.setAcquireRetryDelay(500);  // 500 miliseconds wait before try to acquire connection again
		_source.setCheckoutTimeout(0);      // 0 = wait indefinitely for new connection
		// if pool is exhausted
		_source.setAcquireIncrement(5);     // if pool is exhausted, get 5 more connections at a time
		// cause there is a "long" delay on acquire connection
		// so taking more than one connection at once will make connection pooling
		// more effective.

		// this "connection_test_table" is automatically created if not already there
		_source.setAutomaticTestTable("connection_test_table");
		_source.setTestConnectionOnCheckin(false);

		// testing OnCheckin used with IdleConnectionTestPeriod is faster than  testing on checkout

		_source.setIdleConnectionTestPeriod(3600); // test idle connection every 60 sec
		_source.setMaxIdleTime(0); // 0 = idle connections never expire
		// *THANKS* to connection testing configured above
		// but I prefer to disconnect all connections not used
		// for more than 1 hour

		// enables statement caching,  there is a "semi-bug" in c3p0 0.9.0 but in 0.9.0.2 and later it's fixed
		_source.setMaxStatementsPerConnection(100);

		_source.setBreakAfterAcquireFailure(false);  // never fail if any way possible
		// setting this to true will make
		// c3p0 "crash" and refuse to work
		// till restart thus making acquire
		// errors "FATAL" ... we don't want that
		// it should be possible to recover
		_source.setDriverClass(Config.DATABASE_DRIVER);
		_source.setJdbcUrl(Config.DATABASE_URL);
		_source.setUser(Config.DATABASE_LOGIN);
		_source.setPassword(Config.DATABASE_PASSWORD);

		/* Test the connection */
		_source.getConnection().close();

		if (Config.DEBUG) _log.fine("Database Connection Working");

		if (Config.DATABASE_DRIVER.toLowerCase().contains("microsoft"))
               _providerType = ProviderType.MsSql;
           else
               _providerType = ProviderType.MySql;
	}
	catch (SQLException x)
	{
		if (Config.DEBUG) _log.fine("Database Connection FAILED");
		// rethrow the exception
		throw x;
	}
	catch (Exception e)
	{
		if (Config.DEBUG) _log.fine("Database Connection FAILED");
		throw new SQLException("could not init DB connection:"+e);
	}
}
 

public ManagedDataSource create(DataSourceConfiguration config) throws SQLMissingDependencyException, SQLConfigurationException {

        //
        // http://www.mchange.com/projects/c3p0/index.html#configuration_properties
        //

        //
        // these system properties need turned off prior to creating our first
        // instance of the ComboPooledDataSource, otherwise, they are ignored

        // turn off VMID stuff (causes long ugly names for datasources)
        System.setProperty("com.mchange.v2.c3p0.VMID", "NONE");

        // jmx is off by default
        if (!config.getJmx()) {
            // apparently, c3p0 does this with a system-wide property
            // com.mchange.v2.c3p0.management.ManagementCoordinator=com.mchange.v2.c3p0.management.NullManagementCoordinator
            System.setProperty("com.mchange.v2.c3p0.management.ManagementCoordinator", "com.mchange.v2.c3p0.management.NullManagementCoordinator");
        } else {
            System.setProperty("com.mchange.v2.c3p0.management.ManagementCoordinator", "com.cloudhopper.commons.sql.c3p0.C3P0CustomManagementCoordinator");
        }

        // set the JMX domain for the C3P0
        C3P0CustomManagementCoordinator.setJmxDomainOnce(config.getJmxDomain());

        // create a new instance of the c3p0 datasource
        ComboPooledDataSource cpds = new ComboPooledDataSource(true);

        // set properties
        try {
            // set required properties
            cpds.setDriverClass(config.getDriver());
            cpds.setUser(config.getUsername());
            cpds.setPassword(config.getPassword());
            cpds.setJdbcUrl(config.getUrl());

            // set optional properties
            cpds.setDataSourceName(config.getName());
            cpds.setMinPoolSize(config.getMinPoolSize());
            cpds.setMaxPoolSize(config.getMaxPoolSize());
            // we'll set the initial pool size to the minimum size
            cpds.setInitialPoolSize(config.getMinPoolSize());

            // set the validation query
            cpds.setPreferredTestQuery(config.getValidationQuery());

            // amount of time (in ms) to wait for getConnection() to succeed
            cpds.setCheckoutTimeout((int)config.getCheckoutTimeout());

            // checkin validation
            cpds.setTestConnectionOnCheckin(config.getValidateOnCheckin());

            // checkout validation
            cpds.setTestConnectionOnCheckout(config.getValidateOnCheckout());

            // amount of time to wait to validate connections
            // NOTE: in seconds
            int seconds = (int)(config.getValidateIdleConnectionTimeout()/1000);
            cpds.setIdleConnectionTestPeriod(seconds);

            // set idleConnectionTimeout
            // NOTE: in seconds
            seconds = (int)(config.getIdleConnectionTimeout()/1000);
            cpds.setMaxIdleTimeExcessConnections(seconds);

            // set activeConnectionTimeout
            seconds = (int)(config.getActiveConnectionTimeout()/1000);
            cpds.setUnreturnedConnectionTimeout(seconds);

            if (config.getDebug()) {
                cpds.setDebugUnreturnedConnectionStackTraces(true);
            } else {
                cpds.setDebugUnreturnedConnectionStackTraces(false);
            }

            // properties I think aren't valid for c3p0
            // defines how many times c3p0 will try to acquire a new Connection from the database before giving up.
            cpds.setAcquireRetryAttempts(10);

        } catch (PropertyVetoException e) {
            throw new SQLConfigurationException("Property was vetoed during configuration", e);
        }

        /**
        // configure c3p0 defaults that seem to make more sense
        /**
         *  c3p0.acquireIncrement	hibernate.c3p0.acquire_increment
            c3p0.idleConnectionTestPeriod	hibernate.c3p0.idle_test_period
            c3p0.initialPoolSize	not available -- uses minimum size
            c3p0.maxIdleTime	hibernate.c3p0.timeout
            c3p0.maxPoolSize	hibernate.c3p0.max_size
            c3p0.maxStatements	hibernate.c3p0.max_statements
            c3p0.minPoolSize	hibernate.c3p0.min_size
            c3p0.testConnectionsOnCheckout 	hibernate.c3p0.validate hibernate 2.x only!
         */
        
        return new C3P0ManagedDataSource(this, config, cpds);
    }