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

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;
}
 

/**
 * 使用硬连接的方式
 * @throws PropertyVetoException
 * @throws SQLException
 */
public void HardcodeStyleTest() throws PropertyVetoException, SQLException {
    // 1.创建连接池的核心工具类
    ComboPooledDataSource comboPooledDataSource = new ComboPooledDataSource();

    // 2.设置连接数据库所需的参数
    comboPooledDataSource.setDriverClass("com.mysql.cj.jdbc.Driver");
    comboPooledDataSource.setJdbcUrl("jdbc:mysql://localhost:3306/day34jdbc?serverTimezone = GMT%2B8 ");
    comboPooledDataSource.setUser("root");
    comboPooledDataSource.setPassword("GJXAIOU");

    // 3.设置C3P0连接池的属性:初始化连接数、最大连接数、等待时间
    comboPooledDataSource.setInitialPoolSize(3);
    comboPooledDataSource.setMaxPoolSize(6);
    comboPooledDataSource.setMaxIdleTime(1000);

    // 4.从连接池中获取数据库连接对象
    Connection connection = comboPooledDataSource.getConnection();

    // 5.准备preparedStatement执行SQL语句
    connection.prepareStatement("delete from person where id = 3").executeUpdate();
}
 

@Override
public DataSource wrap(ReportDataSource rptDs) {
    try {
        ComboPooledDataSource dataSource = new ComboPooledDataSource();
        dataSource.setDriverClass(rptDs.getDriverClass());
        dataSource.setJdbcUrl(rptDs.getJdbcUrl());
        dataSource.setUser(rptDs.getUser());
        dataSource.setPassword(rptDs.getPassword());
        dataSource.setInitialPoolSize(MapUtils.getInteger(rptDs.getOptions(), "initialPoolSize", 3));
        dataSource.setMinPoolSize(MapUtils.getInteger(rptDs.getOptions(), "minPoolSize", 1));
        dataSource.setMaxPoolSize(MapUtils.getInteger(rptDs.getOptions(), "maxPoolSize", 20));
        dataSource.setMaxStatements(MapUtils.getInteger(rptDs.getOptions(), "maxStatements", 50));
        dataSource.setMaxIdleTime(MapUtils.getInteger(rptDs.getOptions(), "maxIdleTime", 1800));
        dataSource.setAcquireIncrement(MapUtils.getInteger(rptDs.getOptions(), "acquireIncrement", 3));
        dataSource.setAcquireRetryAttempts(MapUtils.getInteger(rptDs.getOptions(), "acquireRetryAttempts", 30));
        dataSource.setIdleConnectionTestPeriod(
            MapUtils.getInteger(rptDs.getOptions(), "idleConnectionTestPeriod", 60));
        dataSource.setBreakAfterAcquireFailure(
            MapUtils.getBoolean(rptDs.getOptions(), "breakAfterAcquireFailure", false));
        dataSource.setTestConnectionOnCheckout(
            MapUtils.getBoolean(rptDs.getOptions(), "testConnectionOnCheckout", false));
        return dataSource;
    } catch (Exception ex) {
        throw new RuntimeException("C3p0DataSourcePool Create Error", ex);
    }
}
 

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("openzaly init mysql master connection pool cpds={}", cpds);
}
 

public DbToolkit(String urlBase,String usernameBase,String passwordBase){
	cpds=new ComboPooledDataSource();  
       cpds.setUser(usernameBase);  
       cpds.setPassword(passwordBase);  
       cpds.setJdbcUrl(urlBase);  
       try {  
           cpds.setDriverClass(DRIVERCLASS);  
       } catch (PropertyVetoException e) {  
           // TODO Auto-generated catch block  
           e.printStackTrace();  
       }  
       cpds.setInitialPoolSize(20);  
       cpds.setMaxIdleTime(20);  
       cpds.setMaxPoolSize(30);  
       cpds.setMinPoolSize(1);  	
}
 

@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;
}
 

private ComboPooledDataSource createConnection() {
	try {
		ComboPooledDataSource cpds = new ComboPooledDataSource();
		cpds.setDriverClass("com.mysql.jdbc.Driver");
		cpds.setJdbcUrl("jdbc:mysql://" + MYSQL_DATA.HOST + ":" + MYSQL_DATA.PORT + "/" + MYSQL_DATA.DATABASE);
		cpds.setProperties(connectionProperties);
		cpds.setInitialPoolSize(POOL_DATA.INITIAL_POOL_SIZE);
		cpds.setMinPoolSize(POOL_DATA.MIN_POOL_SIZE);
		cpds.setMaxPoolSize(POOL_DATA.MAX_POOL_SIZE);
		cpds.setTestConnectionOnCheckin(POOL_DATA.TEST_CONNECTION_ON_CHECKIN);
		cpds.setIdleConnectionTestPeriod(POOL_DATA.IDLE_CONNECTION_TEST_PERIOD);
		return cpds;
	} catch (PropertyVetoException e) {
		e.printStackTrace();
	}
	return null;
}
 

@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 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;
}
 

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);
}
 

public DataSource createDataSource(String url, String username, String password, int initialSize, int maxPoolSize) throws PropertyVetoException {
    ComboPooledDataSource dataSource = new ComboPooledDataSource();
    dataSource.setDriverClass("com.mysql.jdbc.Driver");
    dataSource.setJdbcUrl(url);
    dataSource.setUser(username);
    dataSource.setPassword(password);
    dataSource.setInitialPoolSize(initialSize);
    dataSource.setMaxPoolSize(maxPoolSize);
    dataSource.setTestConnectionOnCheckout(true);
    return dataSource;
}
 

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());
	}
}
 

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());
	}
}
 

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);
	}
}
 

@Override
public DataSource getDataSource(JsonObject config) throws SQLException {
  String url = config.getString("url");
  if (url == null) throw new NullPointerException("url cannot be null");
  String driverClass = config.getString("driver_class");
  String user = config.getString("user");
  String password = config.getString("password");
  Integer maxPoolSize = config.getInteger("max_pool_size");
  Integer initialPoolSize = config.getInteger("initial_pool_size");
  Integer minPoolSize = config.getInteger("min_pool_size");
  Integer maxStatements = config.getInteger("max_statements");
  Integer maxStatementsPerConnection = config.getInteger("max_statements_per_connection");
  Integer maxIdleTime = config.getInteger("max_idle_time");
  Integer acquireRetryAttempts = config.getInteger("acquire_retry_attempts");
  Integer acquireRetryDelay = config.getInteger("acquire_retry_delay");
  Boolean breakAfterAcquireFailure = config.getBoolean("break_after_acquire_failure");

  // If you want to configure any other C3P0 properties you can add a file c3p0.properties to the classpath
  ComboPooledDataSource cpds = new ComboPooledDataSource();
  cpds.setJdbcUrl(url);
  if (driverClass != null) {
    try {
      cpds.setDriverClass(driverClass);
    } catch (PropertyVetoException e) {
      throw new IllegalArgumentException(e);
    }
  }
  if (user != null) {
    cpds.setUser(user);
  }
  if (password != null) {
    cpds.setPassword(password);
  }
  if (maxPoolSize != null) {
    cpds.setMaxPoolSize(maxPoolSize);
  }
  if (minPoolSize != null) {
    cpds.setMinPoolSize(minPoolSize);
  }
  if (initialPoolSize != null) {
    cpds.setInitialPoolSize(initialPoolSize);
  }
  if (maxStatements != null) {
    cpds.setMaxStatements(maxStatements);
  }
  if (maxStatementsPerConnection != null) {
    cpds.setMaxStatementsPerConnection(maxStatementsPerConnection);
  }
  if (maxIdleTime != null) {
    cpds.setMaxIdleTime(maxIdleTime);
  }
  if(acquireRetryAttempts != null){
    cpds.setAcquireRetryAttempts(acquireRetryAttempts);
  }
  if(acquireRetryDelay != null){
    cpds.setAcquireRetryDelay(acquireRetryDelay);
  }
  if(breakAfterAcquireFailure != null){
    cpds.setBreakAfterAcquireFailure(breakAfterAcquireFailure);
  }
  return cpds;
}
 

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);
    }
 

public boolean open( String dbPath ) throws Exception {
    this.mDbPath = dbPath;

    connectionData = new ConnectionData();
    connectionData.connectionLabel = dbPath;
    connectionData.connectionUrl = new String(dbPath);
    connectionData.user = user;
    connectionData.password = password;
    connectionData.dbType = getType().getCode();

    boolean dbExists = false;
    if (dbPath != null) {
        File dbFile = new File(dbPath + "." + EDb.H2.getExtension());
        if (dbFile.exists()) {
            if (mPrintInfos)
                Logger.INSTANCE.insertInfo(null, "Database exists");
            dbExists = true;
        }
        if (dbPath.toLowerCase().startsWith("tcp")) {
            // no way to check, assume it exists
            dbExists = true;

            // also cleanup path
            int first = dbPath.indexOf('/');
            int second = dbPath.indexOf('/', first + 1);
            int third = dbPath.indexOf('/', second + 1);
            int lastSlash = dbPath.indexOf('/', third + 1);
            if (lastSlash != -1) {
                mDbPath = dbPath.substring(lastSlash, dbPath.length());
            }
        }
    } else {
        dbPath = "mem:syntax";
        dbExists = false;
    }

    String jdbcUrl = EDb.H2.getJdbcPrefix() + dbPath;

    if (makePooled) {
        Properties p = new Properties(System.getProperties());
        p.put("com.mchange.v2.log.MLog", "com.mchange.v2.log.FallbackMLog");
        p.put("com.mchange.v2.log.FallbackMLog.DEFAULT_CUTOFF_LEVEL", "OFF");
        System.setProperties(p);

        comboPooledDataSource = new ComboPooledDataSource();
        comboPooledDataSource.setDriverClass(DRIVER_CLASS);
        comboPooledDataSource.setJdbcUrl(jdbcUrl);
        if (user != null && password != null) {
            comboPooledDataSource.setUser(user);
            comboPooledDataSource.setPassword(password);
        }
        comboPooledDataSource.setInitialPoolSize(10);
        comboPooledDataSource.setMinPoolSize(5);
        comboPooledDataSource.setAcquireIncrement(5);
        comboPooledDataSource.setMaxPoolSize(30);
        comboPooledDataSource.setMaxStatements(100);
        comboPooledDataSource.setMaxIdleTime(14400); // 4 hours by default

        // comboPooledDataSource.setCheckoutTimeout(2000);
        comboPooledDataSource.setAcquireRetryAttempts(1);
        // comboPooledDataSource.setBreakAfterAcquireFailure(false);
        // TODO remove after debug
        // comboPooledDataSource.setUnreturnedConnectionTimeout(180);

    } else {
        if (user != null && password != null) {
            singleJdbcConn = DriverManager.getConnection(jdbcUrl, user, password);
        } else {
            singleJdbcConn = DriverManager.getConnection(jdbcUrl);
        }
    }
    if (mPrintInfos) {
        String[] dbInfo = getDbInfo();
        Logger.INSTANCE.insertDebug(null, "H2 Version: " + dbInfo[0] + "(" + dbPath + ")");
    }
    return dbExists;
}