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com.mchange.v2.c3p0

Class DataSources

public final class DataSources
extends java.lang.Object
A simple factory class for creating DataSources. Generally, users will call DataSources.unpooledDataSource() to get a basic DataSource, and then get a pooled version by calling DataSources.pooledDataSource().

Most users will not need to worry about configuration details. If you want to use a PreparedStatement cache, be sure to call the version of DataSources.pooledDataSource() that accepts a statement_cache_size parameter, and set that to be a number (much) greater than zero. (For maximum performance, you would set this to be several times the number kinds of PreparedStatements you expect your application to use.)

For those interested in detailed configuration, note that c3p0 pools can be configured by explicit method calls on PoolConfig objects, by defining System properties, or by defining a c3p0.properties file in your resource path. See PoolConfig for details.

Method Summary

static void
destroy(DataSource pooledDataSource)
Immediately releases resources (Threads and database Connections) that are held by a C3P0 DataSource.
static void
forceDestroy(DataSource pooledDataSource)
Deprecated. forceDestroy() is no longer meaningful, as a set of pools is now directly associated with a DataSource, and not potentially shared.
static DataSource
pooledDataSource(DataSource unpooledDataSource)
Creates a pooled version of an unpooled DataSource using default configuration information.
static DataSource
pooledDataSource(DataSource unpooledDataSource, Map overrideProps)
static DataSource
pooledDataSource(DataSource unpooledDataSource, Properties props)
Creates a pooled version of an unpooled DataSource using configuration information supplied explicitly by a Java Properties object.
static DataSource
pooledDataSource(DataSource unpooledDataSource, String configName)
static DataSource
pooledDataSource(DataSource unpooledDataSource, String configName, Map overrideProps)
static DataSource
pooledDataSource(DataSource unpooledDataSource, PoolConfig pcfg)
Deprecated. if you want to set properties programmatically, please construct a ComboPooledDataSource and set its properties rather than using PoolConfig
static DataSource
pooledDataSource(DataSource unpooledDataSource, int statement_cache_size)
Creates a pooled version of an unpooled DataSource using default configuration information and the specified startement cache size.
static DataSource
unpooledDataSource()
Defines an unpooled DataSource all of whose paramateres (especially jdbcUrl) should be set in config files.
static DataSource
unpooledDataSource(String jdbcUrl)
static DataSource
unpooledDataSource(String jdbcUrl, Properties driverProps)
Defines an unpooled DataSource on the specified JDBC URL.
static DataSource
unpooledDataSource(String jdbcUrl, String user, String password)
Defines an unpooled DataSource on the specified JDBC URL, authenticating with a username and password.

Method Details

destroy

public static void destroy(DataSource pooledDataSource)
            throws SQLException
Immediately releases resources (Threads and database Connections) that are held by a C3P0 DataSource.

Only DataSources created by the poolingDataSource() method hold any non-memory resources. Calling this method on unpooled DataSources is effectively a no-op.

You can safely presume that destroying a pooled DataSource that is wrapped around another DataSource created by this library destroys both the outer and the wrapped DataSource. There is no reason to hold a reference to a nested DataSource in order to explicitly destroy it.

See Also:
PoolConfig

forceDestroy

public static void forceDestroy(DataSource pooledDataSource)
            throws SQLException

Deprecated. forceDestroy() is no longer meaningful, as a set of pools is now directly associated with a DataSource, and not potentially shared. (This simplification was made possible by canonicalization of JNDI-looked-up DataSources within a virtual machine.) Just use DataSources.destroy().

See Also:
destroy(DataSource)

pooledDataSource

public static DataSource pooledDataSource(DataSource unpooledDataSource)
            throws SQLException
Creates a pooled version of an unpooled DataSource using default configuration information.

NOTE: By default, statement pooling is turned off, because for simple databases that do not pre-parse and optimize PreparedStatements, statement caching is a net performance loss. But if your database does optimize PreparedStatements you'll want to turn StatementCaching on via pooledDataSource(javax.sql.DataSource, int).

Returns:
a DataSource that can be cast to a PooledDataSource if you are interested in pool statistics

pooledDataSource

public static DataSource pooledDataSource(DataSource unpooledDataSource,
                                          Map overrideProps)
            throws SQLException

pooledDataSource

public static DataSource pooledDataSource(DataSource unpooledDataSource,
                                          Properties props)
            throws SQLException
Creates a pooled version of an unpooled DataSource using configuration information supplied explicitly by a Java Properties object.
Returns:
a DataSource that can be cast to a PooledDataSource if you are interested in pool statistics
See Also:
PoolConfig

pooledDataSource

public static DataSource pooledDataSource(DataSource unpooledDataSource,
                                          String configName)
            throws SQLException

pooledDataSource

public static DataSource pooledDataSource(DataSource unpooledDataSource,
                                          String configName,
                                          Map overrideProps)
            throws SQLException

pooledDataSource

public static DataSource pooledDataSource(DataSource unpooledDataSource,
                                          PoolConfig pcfg)
            throws SQLException

Deprecated. if you want to set properties programmatically, please construct a ComboPooledDataSource and set its properties rather than using PoolConfig

Creates a pooled version of an unpooled DataSource using configuration information supplied explicitly by a PoolConfig.
Returns:
a DataSource that can be cast to a PooledDataSource if you are interested in pool statistics

pooledDataSource

public static DataSource pooledDataSource(DataSource unpooledDataSource,
                                          int statement_cache_size)
            throws SQLException
Creates a pooled version of an unpooled DataSource using default configuration information and the specified startement cache size. Use a value greater than zero to turn statement caching on.
Returns:
a DataSource that can be cast to a PooledDataSource if you are interested in pool statistics

unpooledDataSource

public static DataSource unpooledDataSource()
            throws SQLException
Defines an unpooled DataSource all of whose paramateres (especially jdbcUrl) should be set in config files.

unpooledDataSource

public static DataSource unpooledDataSource(String jdbcUrl)
            throws SQLException

unpooledDataSource

public static DataSource unpooledDataSource(String jdbcUrl,
                                            Properties driverProps)
            throws SQLException
Defines an unpooled DataSource on the specified JDBC URL.
Parameters:
driverProps - the usual DriverManager properties for your JDBC driver (e.g. "user" and "password" for all drivers that support authentication)
See Also:
java.sql.DriverManager

unpooledDataSource

public static DataSource unpooledDataSource(String jdbcUrl,
                                            String user,
                                            String password)
            throws SQLException
Defines an unpooled DataSource on the specified JDBC URL, authenticating with a username and password.

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