<!-- 1. 数据源对象: C3P0连接池 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
        <property name="jdbcUrl" value="jdbc:mysql:///hib_demo"></property>
        <property name="user" value="root"></property>
        <property name="password" value="root"></property>
        <property name="initialPoolSize" value="3"></property>
        <property name="maxPoolSize" value="10"></property>
        <property name="maxStatements" value="100"></property>
        <property name="acquireIncrement" value="2"></property>
    </bean>
    
    <!-- 2. 创建JdbcTemplate对象 -->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    
    <!-- dao 实例 -->
    <bean id="userDao" class="cn.itcast.h_jdbc.UserDao">
        <property name="jdbcTemplate" ref="jdbcTemplate"></property>
    </bean>

public class UserDao {
    
    // IOC容器注入
//    private DataSource dataSource;
//    public void setDataSource(DataSource dataSource) {
//        this.dataSource = dataSource;
//    }
    
    private JdbcTemplate jdbcTemplate;
    public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
        this.jdbcTemplate = jdbcTemplate;
    }

    class MyResult implements RowMapper<Dept>{
        // 如何封装一行记录
        @Override
        public Dept mapRow(ResultSet rs, int index) throws SQLException {
            Dept dept = new Dept();
            dept.setDeptId(rs.getInt("deptId"));
            dept.setDeptName(rs.getString("deptName"));
            return dept;
        }
    }
}