c3p0 | 易学教程

Can I use one pooled datasource for multiple databases with Spring/Hibernate/c3p0?

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问题 Our application uses Spring/Hibernate for database access. We use multiple hibernate session factories ( hibernate3.LocalSessionFactoryBean ), because the data is in a number of separate databases. Each session factory is configured with a pooled datasource using c3p0 ( c3p0.ComboPooledDataSource ). As it happens, the databases all reside on the same db server. Our issue is that we end up with a number of db connection pools, all connecting into the same server. Is there any way of sharing

APPARENT DEADLOCK c3p0 0.9.5.1 spring

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问题 We are facing APPARENT DEADLOCK while using c3p0 0.9.5.1 ( which is latest version of c3p0). following is the connection pool config we are using. p:driverClass="${app.jdbc.driverClassReplica}" p:jdbcUrl="jdbc:mysql://database,database/dbname" p:acquireIncrement="5" p:idleConnectionTestPeriod="300" p:maxPoolSize="100" p:maxStatements="2000" p:minPoolSize="10" p:maxIdleTime="1800" p:maxConnectionAge="3600" p:maxIdleTimeExcessConnections="20" p:numHelperThreads="15" p:preferredTestQuery="SELECT

CLIENT STACK TRACE in Hibernate using c3p0

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This may be a duplicate of Weird Error: CLOSE BY CLIENT STACK TRACE But I've asked a new question because I don't see isLoggable method for Log. I'm using Logger class of org.apache.log4j.Logger for my log purpose. My error is same java.lang.Exception: DEBUG -- CLOSE BY CLIENT STACK TRACE at com.mchange.v2.c3p0.impl.NewPooledConnection.close(NewPooledConnection.java:566) at com.mchange.v2.c3p0.impl.NewPooledConnection.close(NewPooledConnection.java:234) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.destroyResource(C3P0PooledConnectionPool.java:470)

C3P0 APPARENT DEADLOCK when my tomcat startup

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问题 when I start up my project by tomcat or resin,my project will throw the error: APPARENT DEADLOCK I think the error caused by c3p0 can't connect my database, I change my xml and replace the domain name by ip of my database, and then the project start up! I use a listener before my c3p0 working ,and I can get the correct domain name and ip，I can't find the reason of APPARENT DEADLOCK. 012-10-22 16:53:04 24344 WARN [Timer-0] com.mchange.v2.async.ThreadPoolAsynchronousRunner:624 - com.mchange.v2

老图搬砖day08——c3p0&Java Web

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文章目录 8.1 c3P0连接池 8.1.1 导入jar包 8.2 Web项目基础 8.2.1 B/S相对于C/S的优势 8.2.3 动态网站和静态网站 8.3 Tomcat的安装与配置 8.3.1 安装 8.3.2 Tomcat目录介绍 8.3.3 tomcat的常用配置 8.4 Java Web项目开发过程 8.4.1 创建一个Web项目 8.4.2 设计Web项目的目录结构 8.4.3 编写Web项目的代码 8.4.4 部署Web项目 8.4.5 运行Web项目 8.5 Tomcat在MyEclipse中的整合和部署 8.5.1 整合 8.5.2 部署 8.1 c3P0连接池 jdbc没有保持连接的能力，一旦超过一定时间没有使用（大约几百毫秒）。连接就会被自动释放，每次新建连接都需要140毫秒左右的时间，而C3P0连接池可以池化连接，随时取用，平均每次取用只需要10-20毫秒。在我们前一天的系统中，我们使用了多次访问和关闭，如果是一个大型项目，很多客户端并发随机访问数据库的情况，该系统效率低，而使用连接池的效率可以提高。 8.1.1 导入jar包创建c3p0文件 < ? xml version = "1.0" encoding = "UTF-8" ? > < c3p0 - config > < ! -- This is my config for mysql -- > <

Asking c3p0 how many connections are in use

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Is there a way to programatically ask c3p0 how many of it's connections are being used, or perhaps logs when the pool is exhausted. As indicated in the URL referenced by Austin's comment above, you can use JMX to inspect and modify running c3p0 PooledDataSources. You can also do so programmatically. c3p0's PooledDataSources have an elaborate API for inspecting their state: http://www.mchange.com/projects/c3p0/apidocs/com/mchange/v2/c3p0/PooledDataSource.html If you are using ComboPooledDataSource, you have access to an even richer API. http://www.mchange.com/projects/c3p0/apidocs/com/mchange

C3P0 mysql 5.7

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一、驱动文件 MYSQL5.5使用的驱动文件是 mysql-connector-java-5.1.47.jar MYSQL5.7使用的驱动文件是 mysql-connector-java-8.0.11.jar 注意在WEB-INF/lib中根据相应的要求进行放置。不要重复放置多种版本，以防冲突。二、连接方式 MYSQL5.5版本的数据库驱动为com.mysql.jdbc.Driver MYSQL5.7版本的数据库驱动为com.mysql.cj.jdbc.Driver c3p0-config.xml基本配置  <property name="driverClass">com.mysql.cj.jdbc.Driver</property> <property name="jdbcUrl">jdbc:mysql://localhost:3306/mvcproject?&useSSL=false&serverTimezone=UTC</property> 注意c3p0-config.xml配置里面的字符是&使用的转义字符&emp；不用转义会报错。当然也可以在jdbc.properties里面进行配置，那么就不需要转义了。来源： https://www.cnblogs.com/liubosong/p/11992056.html

hibernate c3p0 broken pipe

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问题 I'm using hibernate 3 with c3p0 for a program which constantly extracts data from some source and writes it to a database. Now the problem is, that the database might become unavailable for some reasons (in the simplest case: i simply shut it down). If anything is about to be written to the database there should not be any exception - the query should wait for all eternity until the database becomes available again. If I'm not mistaken this is one of the things the connection pool could do

C3P0 配置

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官方文档 : http://www.mchange.com/projects/c3p0/index.html 3 30 1000 false Test false 100 null false 60 3 60 15 100 3 root password select id from test where id=1 300 false true root false con_test 30000 30 10 30 25 10 0 200 300 转： http://www.wujianrong.com/archives/2007/08/c3p0.html 解决MYSQL 8小时问题最近的一个项目在Hibernate使用C3P0的连接池，数据库为Mysql。开发测试没有问题，在运行中每个一段长的空闲时间就出现异常: java 代码 org.hibernate.exception.JDBCConnectionException: could not execute query at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:74) at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper

c3p0的使用

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pom.xml  <dependency> <groupId>com.mchange</groupId> <artifactId>c3p0</artifactId> <version>0.9.5.4</version> </dependency> c3p0-config.xml <?xml version="1.0" encoding="UTF-8"?> <c3p0-config>  <default-config> <property name="initialPoolSize">10</property> <property name="maxIdleTime">30</property> <property name="maxPoolSize">100</property> <property name="minPoolSize">10</property> <property name="maxStatements">200</property> </default-config>  <named-config name="mysql"> <property name="driverClass"