MyBatis在非Spring环境下第三方DataSource设置

三月阳光

　　Spring环境下, MyBatis可以通过其本身的增强mybatis-spring提供的org.mybatis.spring.SqlSessionFactoryBean来注入第三方DataSource.
　　但是在非Spring的环境下, MyBatis的加载需要配置其自身的configuration xml文件,
　　代码段可能是下面这样的:

<environments default="development">
<environment id="development">
<transactionManager type="JDBC">
<property name="..." value="..."/>
</transactionManager>
<dataSource type="POOLED">
<property name="driver" value="${driver}"/>
<property name="url" value="${url}"/>
<property name="username" value="${username}"/>
<property name="password" value="${password}"/>
</dataSource>
</environment>
</environments>
　　其中type属性, 只有三个值可以选择, UNPOOLED, POOLED, 和JNDI
　　事实上DataSource标签的属性Type注入的不是DataSource对象, 而是DataSourceFactory对象, 所以通过对Type进行DataSource的注入是错误的.
　　我们首先需要建一个自己的DataSourceFactory类, 用来封装第三方DataSource, 实现代码(以Druid为例)是这样:

package com.java.mybatis.datasource;
import org.apache.ibatis.datasource.unpooled.UnpooledDataSourceFactory;
import com.alibaba.druid.pool.DruidDataSource;
public class DruidDataSourceFactory extends UnpooledDataSourceFactory {
public DruidDataSourceFactory() {
this.dataSource = new DruidDataSource();
}
}

　　然后就可以在config文件里面注入这个自定义的DataSourceFactory了,

    <environments default="development">
<environment id="development">
<transactionManager type="JDBC" />
<dataSource type="com.java.mybatis.datasource.DruidDataSourceFactory">
<!--<property name="driverClassName" value="org.h2.Driver" />-->
<property name="url" value="jdbc:h2:tcp://localhost/C:/java/h2/data/test;MODE=MYSQL;MVCC=TRUE;DB_CLOSE_DELAY=-1;" />
<property name="username" value="admin" />
<property name="password" value="admin" />
<property name="validationQuery" value="select now()" />
<property name="testWhileIdle" value="true" />
<property name="testOnBorrow" value="false" />
<property name="testOnReturn" value="false" />                           
<!--<property name="filters" value="slf4j" />-->
<property name="poolPreparedStatements" value="false" />
<property name="maxOpenPreparedStatements" value="-1" />
</dataSource>
</environment>
</environments>