c3p0

转载 C3p0数据库连接池的使用 </h1> <div class="clear"></div> <div class="postBody"> 1：首先介绍c3p0的一般使用用法，这种用法练习使用，当然工作的时候使用第二种xml配置完成c3p0的使用。 c3p0的网址： http://www.mchange.com/projects/c3p0/ 　　1.1：第一种方式使用c3p0： 　　　　使用编码方式实现c3p0数据库连接池，练习学习使用的方式 　　　　1.1.1：创建数据库和数据表，省略。 　　　　1.1.2：引包，如下所示，因为需要连接数据库，所以必须加上mysql的驱动包 　　　　　　 c3p0-0.9.1.2.jar 　　　　 　　mysql-connector-java-5.1.12-bin.jar 　　　　1.1.3：创建实体类，例如User.java，源码如下所示： 1 package com.bie.po; 2 /** 3 * @author BieHongLi 4 * @version 创建时间：2017年3月11日 下午12:55:21 5 * 6 */ 7 public class User { 8 9 private int id; 10 private String name; 11 private String password; 12 private

I'm using GWT with Hibernate, c3p0 and MySQL to produce a web app with a limited audience (max 50 users per day). During testing I found that Hibernate was opening a connection with each session but not closing it, irrespective of use of the close() method. My current configuration is as follows: hibernate.connection.driver_class=com.mysql.jdbc.Driver hibernate.connection.url= hibernate.connection.username= hibernate.connection.password= hibernate.dialect=org.hibernate.dialect.MySQLDialect hibernate.current_session_context_class=thread hibernate.c3p0.min_size=1 hibernate.c3p0.max_size=1

I'm trying to setup c3p0 on my spring boot server. This is my config right now spring.datasource.url=jdbc:mysql://url/db spring.datasource.username=username spring.datasource.password=password spring.datasource.driver-class-name=com.mysql.jdbc.Driver spring.datasource.test-on-borrow=true #spring.datasource.test-while-idle=true spring.datasource.validation-query=SELECT 1 #spring.datasource.time-between-eviction-runs-millis=10000 #spring.datasource.min-evictable-idle-time-millis=30000 spring.jpa.show-sql=true spring.jpa.properties.hibernate.globally_quoted_identifiers=true spring.jpa.properties

I wrote a server-side application that powers a website and multiple mobile clients. I used Hibernate for data access. I later discovered that the app fails after a day! When I checked around online, I found out that its a well know issue with MySQL terminating a "stale" connection after 8 hours. In order to avoid this, I found many suggestions like including ?autoReconnect=true , using c3P0 , etc. Since autoReconnect is officially discouraged (especially in production environment) and also because it didn't have any effect when I applied it, I decided to go for c3p0 . Unfortunately, after

after developing several webapps that all had a similar setup with spring, hibernate and c3p0 as connectionpool I wanted to investigate a problem that i noticed everytime: Connectionpool keeps the connections until you shutdown tomcat (or your application server). Today i create the most basic project I could with these four dependencies: org.springframework:spring-web org.springframework:spring-orm org.hibernate:hibernate-core c3p0:c3p0 (plus the specific JDBC driver). My web.xml only creates a ContextLoaderListener that sets up the application context. <context-param> <param-name

I'm facing with UTF-8 encoding problem while persisting my model objects. In Turkish ' ı ' is a letter. Also there're some other Turkish characters that is included in UTF-8 encoding. While I persist my model objects, all ' ı ' characters are persisted as ' ? ' to DB. I'm using MySQL 5.5 on Ubuntu Linux 64-bit OS . Also I've already set hibernate & c3p0 connection encoding property to UTF-8 too. When I debug, the data comes from client is true. Here's my config and I'll be so happy if someone can help me. Thanks in advance. Spring & Hibernate Config <bean id="sessionFactory" class="org

I recently upgraded the version of my Hibernate to 4.3.4.Final. Based on Contextual Sessions configuration of Hibernate this new version is not based on ThreadLocal anymore. If what I have got so far is correct do I need to do anything to make it more efficient? if it is incorrect what should I do? I have no clue. Please note it is mentioned in documentation that: Hibernate offers three methods of current session tracking. The "thread" based method is not intended for production use; it is merely useful for prototyping and tutorials such as this one. Hibernate.cfg.xml <hibernate-configuration>

零、数据库表与配置文件 0.1 数据库t_customer表 CREATE TABLE `t_customer` ( `cid` char(32) NOT NULL, `cname` varchar(40) NOT NULL, `gender` varchar(6) NOT NULL, `birthday` date DEFAULT NULL, `cellphone` varchar(15) NOT NULL, `email` varchar(40) DEFAULT NULL, `description` varchar(500) DEFAULT NULL, PRIMARY KEY (`cid`) ); 0.2 c3p0-config.xml <?xml version="1.0" encoding="UTF-8"?> <c3p0-config> <!-- c3p0默认配置 如果在代码中“ComboPooledDataSource ds = new ComboPooledDataSource();” 这样写就表示使用的是C3P0的缺省(默认)配置信息来创建数据源 --> <default-config> <!-- 连接四大参数配置 --> <property name="jdbcUrl">jdbc:mysql://localhost:3306/customers</property