mybatis配置数据源的两种方式

1.内置连接池

<configuration>
    <environments default="development">
        <environment id="development">
            <!-- 配置事务管理器 -->
            <transactionManager type="JDBC"/>
            <!-- 配置数据源：这里使用 MyBatis 内置连接池 -->
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql:///mybatisstu"/>
                <property name="username" value="root"/>
                <property name="password" value="123"/>
            </dataSource>
        </environment>
    </environments>
</configuration>

2.引入数据源

<configuration>
    <!--引入数据源-->
    <properties resource="db.properties" />
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <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>
    <mappers>
        <mapper resource="org/mybatis/example/BlogMapper.xml"/>
    </mappers>
</configuration>