准备工作:使用c3p0需要用到的jar包有:
c3p0-0.9.1.2.jar
commons-logging-1.2.jar
mchange-commons-java-0.2.20.jar
mysql-connector-java-5.1.7-bin.jar
//以下jar包是在使用JdbcTemplate模板时需要
spring-beans-5.2.6.RELEASE.jar
spring-core-5.2.6.RELEASE.jar
spring-jdbc-5.2.6.RELEASE.jar
spring-tx-5.2.6.RELEASE.jar
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csdn打包下载:c3p0连接池需要的jar包,C3P0Utils.java,c3p0-config.xml
一、在src目录下创建一个名为c3p0-config.xml
的文件,如下:
<?xml version="1.0" encoding="UTF-8"?>
<c3p0-config>
<default-config>
<property name="driverClass">com.mysql.jdbc.Driver</property>
<property name="jdbcUrl">jdbc:mysql://localhost:3306/poem</property>
<!--<property name="jdbcUrl">jdbc:mysql://localhost:3306/poem?useUnicode=true&characterEncoding=UTF-8</property>-->
<property name="user">root</property>
<property name="password">root</property>
<property name="checkoutTimeout">1000</property>
<property name="idleConnectionTestPeriod">30</property>
<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>
</c3p0-config>
二、C3P0Utils
工具类
package com.hebin.util;
import com.mchange.v2.c3p0.ComboPooledDataSource;
import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
/**
* c3p0工具类(数据库连接池工具),用于管理多个数据库连接对象。
*/
public class C3P0Utils {
private static ComboPooledDataSource ds = null;
static {
// 新建数据库连接池,注意这里的参数必须同c3p0-config.xml中的named-config标签中的name的值相同
// 如果不写,则默认调用default-config
ds = new ComboPooledDataSource();
}
public static DataSource getDataSource() {
return ds;
}
/**
* 得到数据库连接对象
* @return
*/
public static Connection getConnection() {
Connection conn;
try {
conn = ds.getConnection();
return conn;
} catch (SQLException e) {
throw new RuntimeException("服务器忙");
}
}
/**
* 关闭所有资源连接
* @param conn
* @param ps
* @param rs
*/
public static void releaseAll(Connection conn, Statement ps, ResultSet rs) {
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
conn = null;
}
if (ps != null) {
try {
ps.close();
} catch (SQLException e) {
e.printStackTrace();
}
ps = null;
}
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
rs = null;
}
}
}
三、使用JdbcTemplate模板测试
@Test
public void C3P0Test(){
Poem poem = new Poem();
poem.setTitle("静夜思");
poem.setDynasty("唐");
poem.setAuthor("李白");
poem.setContent("床前明月光,疑是地上霜。巨头网映月,低头是故乡。");
poem.setCategory("唐诗三百首");
System.out.println(poem.toString());
// 初始化JdbcTemplate模板
JdbcTemplate jdbcTemplate = new JdbcTemplate(C3P0Utils.getDataSource());
String sql = "insert into poem values(null,'"+poem.getTitle()+"','"+poem.getDynasty()+"','"+poem.getAuthor()+"','"+poem.getContent()+"','"+poem.getCategory()+"')";
jdbcTemplate.execute(sql);
}
四、不使用spring系列的jar包进行测试,请转场
数据库连接池【C3P0、阿里Druid、Spring JDBC】