c3p0的使用

<!-- https://mvnrepository.com/artifact/com.mchange/c3p0 -->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.4</version>
        </dependency>

<?xml version="1.0" encoding="UTF-8"?>
<c3p0-config>
    <!--默认配置-->
    <default-config>
        <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>

    <!--配置连接池mysql-->
    <named-config name="mysql">
        <property name="driverClass">com.mysql.cj.jdbc.Driver</property>
        <property name="jdbcUrl">jdbc:mysql://localhost:3306/library_ssm?serverTimezone=GMT%2B8</property>
        <property name="user">root</property>
        <property name="password">000000</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>
    </named-config>

</c3p0-config>

import com.mchange.v2.c3p0.ComboPooledDataSource;
import org.apache.log4j.Logger;

import java.sql.Connection;

public class C3p0Util {
    private static Logger logger = Logger.getLogger(C3p0Util.class);

    private static ComboPooledDataSource cpds = new ComboPooledDataSource("mysql");

    public static Connection getConnection(){
        Connection conn=null;
        try {
            conn= cpds.getConnection();
            logger.debug("从连接池获取了连接");
        }catch (Exception e){
            e.printStackTrace();
            logger.error("获取连接异常");
        }
        return conn;
    }

    public static void releaseConnection(Connection conn){
        try{
            if(conn!=null){
                conn.close();
                logger.debug("释放了一个连接");
            }
        }catch (Exception e){
            e.printStackTrace();
            logger.error("释放连接异常");
        }
    }



}