c3p0

问题 I have a web application that uses c3p0 as the connection pool. we use hibernate as the orm tool. Recently, we have been getting connection timeout exceptions. To debug these exception, i enabled the logging fro C3p0 and got some information in logs. Can anybody help me in making complete sense out of it. DEBUG 2012-08-05 14:43:52,590 [com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0] com.mchange.v2.c3p0.stmt.GooGooStatementCache: checkinAll(): com.mchange.v2.c3p0.stmt

问题 I am building an application with Struts 2 hibernate spring 3 with my sql as back end and c3p0 connection pooling(c3p0-0.9.1.1 jar). Sometimes, when executing a query, I get the below error. When ever I am executing query I check if the connection is closed or not, and if it's closed I will open a new connection before executing the query. public List<T> find(final Query query, final Object[] values) throws HibernateException, NullPointerException { if (values != null) { for (int i = 0; i <

问题 Using Hibernate 4.3.11 with H2 1.4.199 and C3p0 If using Hibernate with Database is is still possible and safe to directly get connection from pool bypassing Hibernate? Im trying to write an sql query, now I know I can use session.createSQLQuery() but this returns a Hibernate org.hibernate SQLQuery class rather than a java.sql.Connection and this is causing a problem for me trying to set the parameters, so I wanted to try using a Connection instead. 回答1: Try this. import org.hibernate.engine

问题 I was trying to solve my problem from my previous post java.sql.SQLRecoverableException: Closed Connection . I tried with c3p0 connections. The property is as follows, <property name="hibernate.connection.provider_class"> org.hibernate.connection.C3P0ConnectionProvider</property> <property name="hibernate.connection.autoReconnect">true</property> <property name="dialect"> org.hibernate.dialect.Oracle10gDialect </property> <property name="hibernate.c3p0.min_size">5</property> <property name=

问题 I found following warning in tomcat7-stderr.{date}.log file. My log file is filled with this log. Mon Jun 30 12:27:47 GMT+05:30 2014 WARN: Caught while disconnecting... ** BEGIN NESTED EXCEPTION ** java.net.SocketException MESSAGE: Socket is not connected STACKTRACE: java.net.SocketException: Socket is not connected at java.net.Socket.shutdownInput(Unknown Source) at com.mysql.jdbc.MysqlIO.quit(MysqlIO.java:2261) at com.mysql.jdbc.ConnectionImpl.realClose(ConnectionImpl.java:4697) at com

问题 I am trying to use C3P0 ( com.mchange.v2.c3p0.ComboPooledDataSource ) with HiveDriver ( org.apache.hive.jdbc.HiveDriver ). I got an exception of this: java.sql.SQLException: Method not supported at org.apache.hive.jdbc.HiveConnection.getHoldability(HiveConnection.java:924) at com.mchange.v2.c3p0.impl.NewPooledConnection.<init>(NewPooledConnection.java:106) at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:159) I found the source

问题 I know this is a very basic question, but I would like a deeper understanding of what "busy" means. I have done a double check that I close all my connections. I know that in c3p0, "the pool will intercept the call to close() and check the underlying Connection back into the pool." I would expect the number of busy connections to trend to zero, but this does not happen. Any ideas why? How long does a connection stay in the "busy" state? Shouldn't the connection become unbusy when I close it?

问题 I am very new in c3p0 integration... I have these settings with c3p0-0.9.5-pre5.jar , hibernate-c3p0-3.5.6-Final.jar , hibernate-core-3.5.6-Final.jar and mchange-commons-java-0.2.6.3.jar jars like below... <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property> <property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property> <property name="hibernate.transaction.factory_class">org.hibernate.transaction

问题 We're using currently c3p0 with postgresql. Does c3p0 supports any fail-over mechanisms (no info in documentation so I assume that unfortunately no)? I've found that mysql,oracle and ms sql supports some failover options in jdbc url, e.g. jdbcUrl="jdbc:sqlserver://mainserver:1433;failoverPartner=backupserver; Are pgpool and pgpool-II only posibilities for postgresql? 回答1: I don't know of any built-in failover in either the JDBC driver or the PostgreSQL core Other options besides pgpool-II are

问题 As c3p0 does not seem to be bundled with Hibernate anymore (as of versions > 3.3, I am using Hibernate 3.6.0), I'd like to know how to integrate c3p0 with Hibernate. Obviously the old approach with <property name="connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property> does not seem to work anymore, as the class C3P0ConnectionProvider is not provided by Hibernate anymore. Do I now have to build this on my own or is it safe to integrate the hibernate-c3p0-3.3.x