Or you can just implement ConnectionTester directly, and set the parameter connectionTesterClassName. Thread of c3p0-spawned Threads is determined. You can define named configurations which augment and override the default configuration that you define. By default, c3p0 will use that method if it is present. See the box below.
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Connections from a JDBC client application
It’s a good idea to benchmark your application with and without statement pooling jdb3c see if and how much it helps. The fully qualified class-name of an implememtation of the ConnectionCustomizer interface, which users can jdgc4 to set up Connections when they are acquired from the database, or on check-out, and potentially to clean things up jdb4c check-in and Connection destruction. If you know you want to use the jdbc4 Connection. Most applications will never use per-user or named configurations.
Establishing a connection is the first step any JDBC application must take when working with database data. They shouldn’t store any state. Note that you must specify ordinary config params explicitly inside a c3p0 scope one way or another, even in a c3p0. But if tasks sometimes hang indefinitely, you can use this parameter to force a call to the task thread’s interrupt method if a task exceeds a set time limit.
I think this is absolutely, undeniably the right policy, but there is no consensus among JDBC driver vendors. Setting forceIgnoreUnresolvedTransactions is strongly discouraged, because if clients are not careful to commit or rollback themselves prior to closeor do not set Connection autoCommit consistently, bizarre unreproduceable behavior and database lockups can occur. The following properties can be set directly in code as JavaBeans properties, via a System properties or a c3p0.
Difference between JDBC 3.0 & JDBC 4.0
Answers Answers and Comments. The JDBC spec is unforgivably silent on what should happen to unresolved, pending transactions on Connection close.
OldProgrammer 7, 3 16 Or you can just implement ConnectionTester directly, and set the parameter connectionTesterClassName. If you set breakAfterAcquireFailure to true ve, the DataSource will consider itself broken after a failed round of Connection attempts, and future client requests will fail immediately.
Defining a preferredTestQuery that will execute quickly in your database may dramatically speed up Connection tests.
Determines how many connections at a time c3p0 will try to acquire when the pool is exhausted. For applications that do use jbdc3 and per-user configurations, here is the complete, normative precedence hierarchy:. For most applications, Connection pooling will provide a significant performance gain, especially if you are acquiring an unpooled Connection for each client access.
Forces idbc3 password that should by PooledDataSources when a user calls the default getConnection method. If you can, stick with c3p0’s default behavior. Unordered List Ordered List.
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Connections and Statements are pooled on a per-authentication basis. The new features availble in J2SE 1. Which version of jconn3. Looking for advice in using c3p0 with hibernate? In this version there is number of properties defined for the ConnectionPoolDataSource. You are also using the ojdb C3P0 does provide an API that allows you to invoke non-standard methods reflectively on an underlying Connection.
See Appendix A for details. If you would the test to timeout and fail, set the following key.
Below is a sample ConnectionCustomizer. The identityToken is a unique String associated with each c3p0 DataSource. See ” Configuring Connection Testing “. To use c3p0 with JBoss: Occasionally it is useful to override the default values of standard Connection properties such as transactionIsolationholdabilityor readOnly.