c3p0

where should c3p0 properties specified?

由 隐身守侯 提交于 2020-01-06 14:54:12
问题 I am using spring/hibernate integrated application. I have configured c3p0 connection pooling. I am using c3p0 combopooled datasource. Where should I specify combopooled datasource properties? In this section? <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> <property name="mappingLocations" value="classpath:hibernate-mapping.xml" /> <property name="hibernateProperties"> <props> **//Here do I need to specify combopooled datasource properties? /

c3p0-0.9.5.2 Statement unwrap cause abstractmethoderror

由 ∥☆過路亽．° 提交于 2020-01-06 03:26:06
问题 I use c3p0 version 0.9.5.1. The unwrap() method bug with this error : java.lang.AbstractMethodError: Method com/mchange/v2/c3p0/impl/NewProxyStatement.unwrap(Ljava/lang/Class;)Ljava/lang/Object; is abstract at com.mchange.v2.c3p0.impl.NewProxyStatement.unwrap(NewProxyStatement.java) This is my code : com.mysql.jdbc.Statement stm = proxyStatement.unwrap(com.mysql.jdbc.Statement.class) I saw some post said that it should work since 0.9.5. Is it still a bug? How can I get the original Statement

Setting fetch size to negative number

由 a 夏天 提交于 2020-01-05 09:22:34
问题 I'm working with someone else's code, which contains the lines: Connection conn = dataSource.getConnection(); conn.setAutoCommit(false); Statement stmt = conn.createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY); stmt.setFetchSize(Integer.MIN_VALUE); ResultSet rs = stmt.executeQuery(myQuery); I was wondering if someone could explain the effect of setting the fetch size to Integer.MIN_VALUE? That is, does it fetch the maximum number of rows possible to memory, or does it

Setting fetch size to negative number

由 纵然是瞬间 提交于 2020-01-05 09:22:32
问题 I'm working with someone else's code, which contains the lines: Connection conn = dataSource.getConnection(); conn.setAutoCommit(false); Statement stmt = conn.createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY); stmt.setFetchSize(Integer.MIN_VALUE); ResultSet rs = stmt.executeQuery(myQuery); I was wondering if someone could explain the effect of setting the fetch size to Integer.MIN_VALUE? That is, does it fetch the maximum number of rows possible to memory, or does it

c3p0 Connection Checkin

由 筅森魡賤 提交于 2020-01-03 13:10:04
问题 I'm trying to implement a solution with c3p0 for the first time. I understand how to initialize the connection pool and "checkout" a Connection from the pool as follows: ComboPooledDataSource cpds = new ComboPooledDataSource(); cpds.setDriverClass(driverClass); cpds.setJdbcUrl(url); cpds.setUser(username); cpds.setPassword(password); Connection conn = cpds.getConnection(username, password); But I am having trouble finding out how to "checkin" an already used Connection to go back into the

c3p0 Connection Checkin

由 ╄→гoц情女王★ 提交于 2020-01-03 13:09:34
问题 I'm trying to implement a solution with c3p0 for the first time. I understand how to initialize the connection pool and "checkout" a Connection from the pool as follows: ComboPooledDataSource cpds = new ComboPooledDataSource(); cpds.setDriverClass(driverClass); cpds.setJdbcUrl(url); cpds.setUser(username); cpds.setPassword(password); Connection conn = cpds.getConnection(username, password); But I am having trouble finding out how to "checkin" an already used Connection to go back into the

How to re-deploy a hibernate-c3p0 project on tomcat 7 without getting strange c3p0 errors

由 半城伤御伤魂 提交于 2020-01-01 19:08:13
问题 If the project is re-deployed through netbeans on tomcat 7 then I get errors like java.lang.IllegalStateException at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1600) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559) at com.mchange.v2.resourcepool.BasicResourcePool.checkIdleResources(BasicResourcePool.java:1481) at com.mchange.v2.resourcepool.BasicResourcePool.access$2000(BasicResourcePool.java:32) at com.mchange.v2

c3p0和QueryRunner的结合使用，让开发更加简便

由 强颜欢笑 提交于 2020-01-01 05:08:11
1：DBUtils中的QueryRunner的使用： 　　1.1：QueryRunner中提供了对SQL语句操作的api； 　　1.2：主要有三个方法： 　　　　1.2.1：query()：用于执行select（查询）； 　　　　1.2.2：update()：用于执行insert（插入）/update（更新）/delete（删除）； 　　　　1.2.3：batch()：批处理； 2：c3p0和QueryRunner的结合使用： 　　2.1：首先导包，如下所示的包； 　　　　c3p0-0.9.1.2.jar 　　　　commons-dbutils-1.6.jar 　　　　mysql-connector-java-5.1.12-bin.jar　　 　 2.2：当然导包之前你需要创建好数据库和数据表哦！~~~　 　　　 在src目录下面记住配置c3p0-config.xml文件 1 <c3p0-config> 2 3 <!-- c3p0默认配置，下面还可以配置多个数据库 --> 4 <default-config> 5 <property name="jdbcUrl">jdbc:mysql://localhost:3306/test 6 </property> 7 <property name="driverClass">com.mysql.jdbc.Driver</property>

C3p0 connection pooling for jpa in persistence.xml not working?

由 淺唱寂寞╮ 提交于 2019-12-31 22:27:10
问题 I'm still getting JDBC timeouts after trying to configure c3p0 following all of the examples I could find. I'm using JPA, Hibernate, Tomcat, MySQL [AWS RDS]. Here's the snippet from persistence.xml: <property name="javax.persistence.jdbc.url" value="jdbc:mysql://url..." /> <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" /> <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" /> <property name="connection.provider_class" value="org

Hibernate c3p0 connection pool not timing out idle connections

由 谁都会走 提交于 2019-12-31 17:53:36
问题 We have a java server connecting to a MySQL 5 database usingHibernate as our persistence layer which is using c3p0 for DB connection pooling. I've tried following the c3p0 and hibernate documentation: Hibernate - HowTo Configure c3p0 connection pool C3P0 Hibernate properties C3P0.properties configuration We're getting an error on our production servers stating that: ... Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection
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