CShop Project 02: 创建c3p0配置文件 / 连接数据库

1. 　　创建c3p0配置文件

c3p0-config.xml (文件名必须为c3p0-config.xml)

<?xml version="1.0" encoding="UTF-8"?>
<c3p0-config>
    <!-- 默认配置，只可以出现一次 -->
    <default-config>
        <property name="driverClass">com.mysql.jdbc.Driver</property>
        <property name="jdbcUrl">
            <![CDATA[jdbc:mysql://127.0.0.1:3306/cake?useUnicode=true&characterEncoding=UTF-8&useSSL=true]]>
        </property>
        <property name="user">root</property>
        <property name="password">root</property>
    </default-config> 
</c3p0-config> 

2.　　连接数据库

import java.sql.PreparedStatement;
import java.sql.ResultSet;

import javax.sql.DataSource;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class Test {
    public static void main(String[] args) throws Exception{
        
        DataSource ds = new ComboPooledDataSource(); // 使用c3p0的数据源
        Connection con = ds.getConnection();
        PreparedStatement ps = con.prepareStatement("select * from goods");
        ResultSet rs = ps.executeQuery();
        while(rs.next()) {
            System.out.println(rs.getString("name"));
        }
        rs.close();
        ps.close();
        con.close();
            
    }
}

效果: