If you do not set a dataSourceName , the name attribute may not be defined at all, or it may take some default value. Advanced users might use the raw connection operations described above to access this functionality, but a convenience class is available in a separate jar file c3p0-oracle-thin-extras If you use the DataSources factory class, and you want to programmatically override default configuration parameters, make use of the PoolConfig class:. You can define overrides of default or named configurations that apply only to pools of Connections authenticated for a particular user. OldProgrammer 7, 3 16 You can directly alter the property values associated with a particular DataSource in your code, or you can configure c3p0 externally API docs for c3p0 are here.
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c3p0-v – JDBC3 Connection and Statement Pooling – Documentation
As database is a shared resource, so many application can access the same data store. The data in the Blob and Clob can be altered: Connections from a JDBC client application.
In a properties-style config file If you do not explicitly set a RegistryName, no default value is used, no name attribute is embedded. Zero means no maximum absolute age is enforced. But this can be resource-costly, as dormant pooled beans needlessly hold the Connection’s network and database resources. Here is an example ConnectionCustomizer implementation that makes use of user-defined configuration extensions. This fact is a natural consequence of the definition of the DataSource spec which allows Connections to be acquired with multiple user authenticationsand the requirement that all Connections in a single pool be functionally identical.
JavaBeans-style Properties The following properties can be set directly in code as JavaBeans properties, via a System properties or a c3p0.
The description of the issue is exactly the same as that which you described.
Not all configuration parameters support per-user overrides. A Connection older than maxConnectionAge will be destroyed and purged from the pool.
Most databases support Connections that remain open for hours at a time. Following JavaBean conventions, we note that if an Object has a property of type T called fooit will have methods that look like See ” Configuring Connection Testing vss. May throw a SQLException.
SQL Anywhere jdbc3 v jdbc4
The point of Connection pooling is to bear the cost of acquiring a Connection only once, and then to reuse the Connection many, many times.
The default values of any c3p0 DataSource property are determined by configuration you supply, or else revert to hard-coded defaults [see configuration properties ]. By default, c3p0 rolls back jdbv4 transactional work when a user calls close. To install a ConnectionCustomizer just implement the interface, make your class accessible to c3p0’s ClassLoader, and set the configuration parameter below:. Unreferenced instances of PooledDataSource that are not close ed by clients close themselves jdb3 to garbage collection in their finalize methods.
You can always go back to simple, slow, and robust.
Difference between JDBC 3.0 & JDBC 4.0
Align text to the left Center text Align text to the right. For example, if you have set maxPoolSize to jdbd3, and if the DataSource is managing connections under two username-password pairs [the default, and one other pair established via a call to getConnection user, passwordyou should expect to see as many as 40 Connections from getNumConnectionsAllUsers. Regardless of how you create your DataSource, c3p0 will use defaults for any configuration parameters that you do not specify programmatically.
Because extensions are primary designed to be used within ConnectionCustomizer implementations, the AbstractConnectionCustomizer class also defines a protected extensionsForToken Unless you are supplying your own unpooled DataSource, a must jdbc be provided and appropriate for the JDBC driver, however it is resolved.
Upload Image Jfbc3 to Image. If you wish c3p0 to leave transaction management to you, and neither commit nor rollback nor modify the state of Connection autoCommityou may set forceIgnoreUnresolvedTransactions to true. For these applications, we present a simplified precedence hierarchy:.
If you wish to skip DriverManager resolution entirely and ensure that an instance of the specified class is used to provide Connections, use driverClass in combination with forceUseNamedDriverClass.