jdbc.user=rootjdbc.password=lxn123jdbc.driverClass=com.mysql.jdbc.Driverjdbc.jdbcUrl=jdbc:mysql:///spring1jdbc.initPoolSize=5jdbc.maxPoolSize=10

    <!-- 基于注解的，导入标识的包,可以识别本包，或其自包,其只对带有指定注解的类，方法有效，不是对这个包中的所有类和方法有效 -->    <context:component-scan base-package="com.atguigu.spring.jdbc"></context:component-scan>        <!-- 导入资源文件 ，classpath.jdbc.properties 为类路径下的文件名为 jdbc.properties-->    <context:property-placeholder location="classpath:jdbc.properties"/>        <!-- 配置c3p0数据源 -->    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">        <property name="user" value="http://www.mamicode.com/${jdbc.user}"></property>        <property name="password" value="http://www.mamicode.com/${jdbc.password}"></property>        <property name="driverClass" value="http://www.mamicode.com/${jdbc.driverClass}"></property>        <property name="jdbcUrl" value="http://www.mamicode.com/${jdbc.jdbcUrl}"></property>                <property name="initialPoolSize" value="http://www.mamicode.com/${jdbc.initPoolSize}"></property>        <property name="maxPoolSize" value="http://www.mamicode.com/${jdbc.maxPoolSize}"></property>    </bean>        <!-- 配置spring的JdbcTemplate -->    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">        <property name="dataSource" ref="dataSource"></property>    </bean>

private Integer id;private String lastName;private String email;private Department department;

private Integer id;private String name;

package com.atguigu.spring.jdbc;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.jdbc.core.BeanPropertyRowMapper;import org.springframework.jdbc.core.JdbcTemplate;import org.springframework.jdbc.core.RowMapper;import org.springframework.stereotype.Component;@Component//基本注解public class EmployeeDao {        @Autowired    public JdbcTemplate jdbcTemplate;        public Employee get(Integer id){        String sql="select id,last_name,email from tables where id=?";        RowMapper<Employee> rowMapper=new BeanPropertyRowMapper<>(Employee.class);        Employee employee=jdbcTemplate.queryForObject(sql, rowMapper, id);        return employee;    }}    

package com.atguigu.spring.jdbc;import static org.junit.Assert.*;import java.util.List;import java.sql.SQLException;import java.util.ArrayList;import javax.sql.DataSource;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import org.springframework.jdbc.core.BeanPropertyRowMapper;//测试类import org.springframework.jdbc.core.JdbcTemplate;import org.springframework.jdbc.core.RowMapper;public class JDBCTest {        private ApplicationContext ctx=null;    private JdbcTemplate jdbcTemplate;    private EmployeeDao employeeDao;        {        ctx=new ClassPathXmlApplicationContext("applicationContext.xml");        jdbcTemplate=(JdbcTemplate) ctx.getBean("jdbcTemplate");        employeeDao=ctx.getBean(EmployeeDao.class);    }        @Test    //对基于注解的方法测试    public void testEmployeeDao(){        System.out.println(employeeDao.get(1));    }            //获取单个列的值, 或做统计查询    //使用 queryForObject(String sql, Class<Long> requiredType)     public void testQueryForObject2(){        String sql="select count(id) from tables";        long count=jdbcTemplate.queryForObject(sql, Long.class);        System.out.println(count);    }        //查到实体类的集合    //注意调用的不是 queryForList 方法    public void testQueryForList(){        String sql="select id,last_name,email from tables where id>?";        RowMapper<Employee> rowMapper=new BeanPropertyRowMapper<>(Employee.class);        List<Employee> employees=jdbcTemplate.query(sql, rowMapper, 1);                System.out.println(employees);    }        /**     * 从数据库中获取一条记录, 实际得到对应的一个对象     * 注意不是调用 queryForObject(String sql, Class<Employee> requiredType, Object... args) 方法!     * 而需要调用 queryForObject(String sql, RowMapper<Employee> rowMapper, Object... args)     * 1. 其中的 RowMapper 指定如何去映射结果集的行, 常用的实现类为 BeanPropertyRowMapper     * 2. 使用 SQL 中列的别名完成列名和类的属性名的映射. 例如 last_name lastName     * 3. 不支持级联属性. JdbcTemplate 到底是一个 JDBC 的小工具, 而不是 ORM 框架     */    public void testQueryForObject(){        String sql="select id,last_name lastName,email,dept_id as \"department.id\" from tables where id=?";                RowMapper<Employee> rowMapper=new BeanPropertyRowMapper<>(Employee.class);        Employee employee=jdbcTemplate.queryForObject(sql, rowMapper,1);                System.out.println(employee);    }        //执行批量更新: 批量的 INSERT, UPDATE, DELETE    //最后一个参数是 Object[] 的 List 类型: 因为修改一条记录需要一个 Object 的数组,     //那么多条不就需要多个 Object 的数组    public void testBatchUpdate(){        String sql="insert into tables(last_name,email,dept_id) values(?,?,?)";                List<Object[]> batchArgs=new ArrayList<>();                batchArgs.add(new Object[]{"AAA","testa",5});        batchArgs.add(new Object[]{"BBB","JIJK",6});        batchArgs.add(new Object[]{"CCC","panpN",3});        batchArgs.add(new Object[]{"DDD","jfids",2});        batchArgs.add(new Object[]{"EEE","tfsd",4});                jdbcTemplate.batchUpdate(sql,batchArgs);    }        //执行 INSERT, UPDATE, DELETE，只修改sql语句，即可    public void testUpdate(){        String sql="update tables set last_name=? where id=?";        jdbcTemplate.update(sql, "权", "1");    }        //测试数据库连接池是否连接成功    public void testDataSource() throws SQLException {        DataSource  dataSource=ctx.getBean(DataSource.class);        System.out.println(dataSource.getConnection());    }}