聊聊、Spring 数据源

平时开发中我们每天都会跟数据库打交道，页面上显示的数字，图片，语音，等等都存在某个地方，而我们就是要从那个地方拿到我们想要的。现在存储数据的方式越来越多，多种多样，但用的最多的还是关系数据库。Spring 中有多种配置数据源方式，各有优缺点。

（1）DBCP

<dependency>
   <groupId>commons-dbcp</groupId>
   <artifactId>commons-dbcp</artifactId>
   <version>1.4</version>
</dependency>

 <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
  <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
  <property name="url"
   value="jdbc:mysql://1.1.0.9:3306/dis?useSSL=false"></property>
  <property name="username" value="root"></property>
  <property name="password" value="123"></property>
  <property name="initialSize" value="5"></property>
  <property name="maxActive" value="10"></property>
</bean>

（2）DriverManagerDataSource 和 SingleConnectionDataSource

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jdbc</artifactId>
    <version>3.0.0.RELEASE</version>
</dependency>

<bean id="dataSource2"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://1.1.0.9:3306/dis"></property>
        <property name="username" value="root"></property>
        <property name="password" value="123"></property>
</bean>

<bean id="dataSource3"
        class="org.springframework.jdbc.datasource.SingleConnectionDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://1.1.0.9:3306/dis"></property>
        <property name="username" value="root"></property>
        <property name="password" value="123"></property>
</bean>

（3）C3P0

<dependency>
    <groupId>c3p0</groupId>
    <artifactId>c3p0</artifactId>
    <version>0.9.1.2</version>
</dependency>

    <bean id="dataSource5" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
        <property name="jdbcUrl"
            value="jdbc:mysql://1.1.0.9:3306/dis?useSSL=false"></property>
        <property name="user" value="root"></property>
        <property name="password" value="123"></property>
        <property name="minPoolSize" value="5" />
        <property name="maxPoolSize" value="20" />
        <property name="initialPoolSize" value="10" />
        <property name="maxIdleTime" value="60" />
        <property name="idleConnectionTestPeriod" value="60" />
        <property name="acquireIncrement" value="5" />
        <property name="acquireRetryAttempts" value="30" />
</bean>

（4）DRUID

<dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.0.19</version>
</dependency>

    <bean id="dataSource1" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url"
            value="jdbc:mysql://1.1.0.9:3306/dis?useSSL=false"></property>
        <property name="username" value="root"></property>
        <property name="password" value="abcd123"></property>
        <property name="filters" value="stat" />
        <property name="maxActive" value="20" />
        <property name="initialSize" value="2" />
        <property name="maxWait" value="60000" />
        <property name="minIdle" value="10" />
        <property name="timeBetweenEvictionRunsMillis" value="60000" />
        <property name="minEvictableIdleTimeMillis" value="300000" />
        <property name="validationQuery" value="SELECT '1'" />
        <property name="testWhileIdle" value="true" />
        <property name="testOnBorrow" value="false" />
        <property name="testOnReturn" value="false" />
        <property name="maxOpenPreparedStatements" value="100" />
    </bean>