c3p0使用

c3p0-config.xml

<?xml version="1.0" encoding="UTF-8"?>

<c3p0-config>

    <named-config name="mvc">
        <property name="user">root</property>
        <property name="password">root</property>
        <property name="driverClass">com.mysql.jdbc.Driver</property>
        <property name="jdbcUrl">jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&amp;characterEncoding=UTF8</property>
        <!-- ?useUnicode=true&amp;characterEncoding=UTF8 -->
        <property name="acquireIncrement">2</property>
        <property name="initialPoolSize">5</property>
        <property name="minPoolSize">5</property>
        <property name="maxPoolSize">10</property>

        <property name="maxStatements">20</property>
        <property name="maxStatementsPerConnection">5</property>
    </named-config>
</c3p0-config>

JdbcUtils

package Utils;

import java.sql.Connection;
import java.sql.SQLException;

import javax.sql.DataSource;

import com.mchange.v2.c3p0.ComboPooledDataSource;

public class JdbcUtil {

    public static void reaseConnection(Connection connection) {
        try {
            if(connection!=null){
                connection.close();
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    private static DataSource dataSource = null;
    static{
        dataSource = new ComboPooledDataSource("mvc");
    }

    public static DataSource getDataSource(){
        return dataSource;
    }

    public static Connection getConnection(){
        try {
            return dataSource.getConnection();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            //e.printStackTrace();
            System.out.println("连接失败");
        }
        return null;

    }
}