SSM报错（二）Mybatis+c3p0+mysql报错mysql-connector-java 6.0.0

今天下午，写了一个测试数据库查询，报了一个错误。

15:15:47.366 [C3P0PooledConnectionPoolManager[identityToken->1bqoqis9qnvh4bw1efpaw3|38e79ae3]-HelperThread-#0] DEBUG com.mchange.v2.resourcepool.BasicResourcePool - An exception occurred while acquiring a poolable resource. Will retry.java.sql.SQLException: No suitable driverat java.sql.DriverManager.getDriver(DriverManager.java:315)at com.mchange.v2.c3p0.DriverManagerDataSource.driver(DriverManagerDataSource.java:285)at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:175)at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:220)at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:206)at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:203)at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1138)at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1125)at com.mchange.v2.resourcepool.BasicResourcePool.access$700(BasicResourcePool.java:44)at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1870)at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:696)

我第一次写的配置是如下内容

<!-- 配置数据库连接 -->    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">        <!-- 数据库连接驱动 -->        <property name="driverClass" value="${jdbc.driverClass}"/>        <!-- 数据库连接地址 -->        <property name="jdbcUrl" value="${jdbc.url}"/>        <!-- 数据库帐号 -->        <property name="user" value="${jdbc.username}"/>        <!-- 数据库密码 -->        <property name="password" value="${jdbc.password}"/>        <!--<!–当连接池中的连接耗尽的时候c3p0一次同时获取连接数.Default:3–>-->        <property name="acquireIncrement" value="${c3p0.acquireIncrement}"/>        <!-- 初始化时获取三个连接，取值应在minPoolSize与maxPoolSize之间 Default：3-->        <property name="initialPoolSize" value="${c3p0.initialPoolSize}"/>        <!-- 最小连接池的大小-->        <property name="minPoolSize" value="${c3p0.minPoolSize}"/>        <!-- 最大连接池 -->        <property name="maxPoolSize" value="${c3p0.maxPoolSize}"/>        <!-- 最大空闲时间，60秒未使用则连接被丢弃。若为0则永不丢弃。Default：0 -->        <property name="maxIdleTime" value="${c3p0.maxIdleTime}"/>        <!-- 每60秒检查所有连接池中的空闲连接。Default：0 -->        <property name="idleConnectionTestPeriod" value="${c3p0.idleConnectionTestPeriod}"/>        <!-- JDBC的标准参数，用以控制数据源内加载的PreparedStatements属于单个Connection而不是整个连接池。所以设置这个参数需要考虑到多方面的因素。-->        <!-- 如果maxStatements与maxStatementsPerConnection均为0，则缓存被关闭。Default：0 -->        <property name="maxStatements" value="${c3p0.maxStatements}"/>        <!-- c3p0是异步操作的，缓慢的JDBC操作通过进程完成。扩展这些操作可以有效的提升性能 通过多线程实现多个操作同时被执行Default：3-->        <property name="numHelperThreads" value="${c3p0.numHelperThreads}"/>    </bean>

链接的是我写的properties文件

jdbc.properties

jdbc.driverClass=com.mysql.jdbc.Driverjdbc.url=jdbc:mysql:127.0.0.1:3306/users?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&failOverReadOnly=falsejdbc.username=Kingjdbc.password=KingW1007c3p0.acquireIncrement=3c3p0.initialPoolSize=3c3p0.idleConnectionTestPeriod=60c3p0.minPoolSize=5c3p0.maxPoolSize=100c3p0.maxStatements=100c3p0.numHelperThreads=10c3p0.maxIdleTime=60

第一次测试是看properties文件有没成功链接进来，所以就在Spring文件里边修改成了Properties相对应的值。修改好过了，在测试了一下，发现还是原来那个错误。于是我又进pom.xml中查看我的jar包

 <dependency>            <groupId>com.mchange</groupId>            <artifactId>c3p0</artifactId>            <version>0.9.5.2</version>        </dependency>        <dependency>            <groupId>mysql</groupId>            <artifactId>mysql-connector-java</artifactId>            <version>6.0.6</version>        </dependency>

我是写的这两个jar包

所问题就在这儿mysql-conector-java

这样选择下来有两种方法获取Driver

一种是com.mysql.jdbc.Driver (我去看了一下6.0.6的介绍，发现com.mysql.jdbc.Driver驱动类被弃用了，新的驱动类是com.mysql.cj.jdbc.Driver）

另一种是com.mysql.cj.jdbc.Driver（修改过Driver后，发现还要修改URL要加时区）

于是我修改成这个驱动，果然，问题还是存在，还是提示着没有合适的驱动

java.sql.SQLException: No suitable driverat java.sql.DriverManager.getDriver(DriverManager.java:315)at com.mchange.v2.c3p0.DriverManagerDataSource.driver(DriverManagerDataSource.java:285)at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:175)at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:220)at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:206)at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:203)at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1138)at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1125)at com.mchange.v2.resourcepool.BasicResourcePool.access$700(BasicResourcePool.java:44)at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1870)at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:696)

然后我在去数据库里边检查，发现，我数据库出了问题。

换成其它的数据库就成功了

但URL的修改成了

jdbc.url=jdbc:mysql://127.0.0.1:3306/users?useUnicode=true&characterEncoding=utf8&useSSL=true&allowMultiQueries=true&serverTimezone=UTC