c3p0 | 易学教程

Spring + c3p0 + postgres

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问题 I am using Spring 3.0.5.RELEASE and Postgres 9.1. I am limiting a maximum number of connections in 17: <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="driverClass" value="${database.driver}" /> <property name="jdbcUrl" value="${database.url}" /> <property name="user" value="${database.username}" /> <property name="password" value="${database.password}" /> <property name="initialPoolSize" value="3" /> <property name="minPoolSize" value="1" /> <property

Getting Exception and application not able to connect with MySqL Database when using connection pooling (c3p0-0.9.1.2) with Hibernate 3.2?

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问题 I am using connection pooling (c3p0-0.9.1.2) with Hibernate 3.2 like this: hibernate.cfg.xml <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property> <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/bspersonaltrainer</property> <property name="hibernate.connection.username">root</property> <property name="hibernate.connection.password">admin</property> <property

JavaEE基础(06)：Servlet整合C3P0数据库连接池

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本文源码： GitHub·点这里 || GitEE·点这里一、C3P0连接池 1、C3P0简介 C3P0是一个开源的JDBC连接池，应用程序根据C3P0配置来初始化数据库连接，可以自动回收空闲连接的功能。 2、核心依赖 <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>${mysql.version}</version> </dependency> <dependency> <groupId>com.mchange</groupId> <artifactId>c3p0</artifactId> <version>${c3p0.version}</version> </dependency> 3、配置文件配置文件位置：放在 resources 目录下，这样C3P0组件会自动加载该配置。 <?xml version="1.0" encoding="UTF-8"?> <c3p0-config> <default-config>  <property name="jdbcUrl">jdbc:mysql://localhost:3306/servlet-jdbc</property> <property name=

JavaEE基础(06)：Servlet整合C3P0数据库连接池

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本文源码： GitHub·点这里 || GitEE·点这里一、C3P0连接池 1、C3P0简介 C3P0是一个开源的JDBC连接池，应用程序根据C3P0配置来初始化数据库连接，可以自动回收空闲连接的功能。 2、核心依赖 < dependency > < groupId > mysql </ groupId > < artifactId > mysql-connector-java </ artifactId > < version > ${mysql.version} </ version > </ dependency > < dependency > < groupId > com.mchange </ groupId > < artifactId > c3p0 </ artifactId > < version > ${c3p0.version} </ version > </ dependency > 3、配置文件配置文件位置：放在 resources 目录下，这样C3P0组件会自动加载该配置。 <?xml version="1.0" encoding="UTF-8"?> < c3p0-config > < default-config >  < property name = " jdbcUrl " > jdbc:mysql:/

JavaEE基础(06)：Servlet整合C3P0数据库连接池

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 本文源码： GitHub·点这里 || GitEE·点这里一、C3P0连接池 1、C3P0简介 C3P0是一个开源的JDBC连接池，应用程序根据C3P0配置来初始化数据库连接，可以自动回收空闲连接的功能。 2、核心依赖 <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>${mysql.version}</version> </dependency> <dependency> <groupId>com.mchange</groupId> <artifactId>c3p0</artifactId> <version>${c3p0.version}</version> </dependency> 3、配置文件配置文件位置：放在 resources 目录下，这样C3P0组件会自动加载该配置。 <?xml version="1.0" encoding="UTF-8"?> <c3p0-config> <default-config>  <property name="jdbcUrl">jdbc:mysql://localhost:3306/servlet

Do I need to use C3P0 pooling library in my (grails) web application?

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问题 I am not familiar at all with connection pooling library. I've just discovered it through this blog article) and I am not sure that I should use one in my web application based on grails/hibernate/mysql. So my question is simple : in which situations would you suggest to integrate a connection pooling library into a grails application? Always, Never or only over some connections threshold? P.S. : If you have ever used successfully C3P0 in your web application, I will greatly appreciate to

how to determine c3p0 max_statements

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问题 I'm wondering how to properly determine what value to use for c3p0 max_statements. I've experienced some caching dead locks which seems to point back to my max_statements configuration based on all the SO Q&A I've read. I'm using mysql and the deadlock appears to happen when I'm doing some multi threading where I have 4 active threads. My configuration <property name="hibernate.connection.provider_class">org.hibernate.service.jdbc.connections.internal.C3P0ConnectionProvider</property>

C3P0: unreturnedConnectionTimeout in production?

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问题 The parameter unreturnedConnectionTimeout times out unreturned connections after a given period of time. I'm trying to decide whether I should use this in my production persistence.xml ? A big plus of using this is that the Connection Pool will be able to recover from leaky connections. A big minus is that leaky connections will be very difficult to detect. Should I use unreturnedConnectionTimeout in production applications? If yes, what should its value be? Are there any other pros/cons I

Hibernate / MySQL connection timeouts — Trying to deal with thread-pooled executors not releasing Hibernate connections to C3P0 after exit

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问题 I have a Tomcat application that uses MySQL, and Hibernate for ORM. The nature of our application demands that we have to pull and aggregate a lot of analytics data from a NoSQL store for each request , so we split the pulling and aggregating for each request into several tasks and delegate those to a thread-pooled executor service. When each thread performs a task, it needs to query / update MySQL regarding certain things so it borrows Hibernate sessions from C3P0 ( which we use for

How to trace and prevent the deadlock appeared in c3po which is running in seperate processes?

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问题 I have a very simple computation which produces letter matrices finds probably all the words in the matrix. The letters in the word are adjacent cells. for (int i = 0; i < 500; i++) { System.out.println(i); Matrix matrix = new Matrix(4); matrix.scanWordsRandomly(9); matrix.printMatrix(); System.out.println(matrix.getSollSize()); matrix.write_to_db(); } Here is the persisting code. public void write_to_db() { Session session = null; try { session = HibernateUtil.getSessionFactory().openSession

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