package cn.itcast.spring3.demo2;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.support.JdbcDaoSupport;
//public class UserDao {
public class UserDao extends JdbcDaoSupport{
/*在Dao层注入JDBC模板*/
/* private JdbcTemplate jdbcTemplate;
public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
this.jdbcTemplate = jdbcTemplate;
}*/
public void add(User user){
String sql = "insert into user values(null,?)";
this.getJdbcTemplate().update(sql, user.getName());
}
public void update(User user){
String sql = "update user set name = ? where id = ?";
this.getJdbcTemplate().update(sql, user.getName(), user.getId());
}
public void delete(User user){
String sql = "delete from user where id = ?";
this.getJdbcTemplate().update(sql, user.getId());
}
public int findCount(){
String sql = "select count(*) from user";
return this.getJdbcTemplate().queryForInt(sql);
}
public String findNameById(int id){
String sql = "select name from user where id = ?";
return this.getJdbcTemplate().queryForObject(sql, String.class, id);
}
public User findById(int id){
String sql = "select * from user where id = ?";
User user = (User) this.getJdbcTemplate().queryForObject(sql, new UserRowMapper(), id);//rowMapper和DBUtils的Handler一样.
//你需要自己去封装它.
//只不过DBUtils给你提供了几个实现类,像beanHandler,beanListHandler,MapHandler,MapList.但是Jdbc模板没有提供实现类,要自己手动去封装它.
return user;
}
public List<User> findAll(){
String sql = "select * from user";
return this.getJdbcTemplate().query(sql, new UserRowMapper());
}
//内部类
class UserRowMapper implements RowMapper<User>{//泛型是User
/**
* rs:结果集.
* rowNum:行号
*/
public User mapRow(ResultSet rs, int rowNum) throws SQLException {
// TODO Auto-generated method stub
//现在呢它不用你去遍历结果集了,它已经把结果集的光标移向了某一行的具体的数据了.
//你在mapRow()方法中不用自己去遍历结果集,这个mapRow()方法可以帮你遍历结果集.
User user = new User();
user.setId(rs.getInt("id"));
user.setName(rs.getString("name"));
return user;
}
}
}
package cn.itcast.spring3.demo2;
public class User {
private Integer id;
private String name;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "User [id=" + id + ", name=" + name + "]";
}
}
package cn.itcast.spring3.demo2;
import java.util.List;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class SpringTest2 {
@Autowired
@Qualifier("userDao")
private UserDao userDao;
@Test
public void demo1(){
//web层->业务层->Dao层
User user = new User();
user.setName("童童");
//user.setName("小编");
//user.setName("小胖");
userDao.add(user);
}
@Test
public void demo2(){
//web层->业务层->Dao层
User user = new User();
user.setId(1);
user.setName("小编");
userDao.update(user);
}
@Test
public void demo3(){
//web层->业务层->Dao层
User user = new User();
user.setId(1);
userDao.delete(user);
}
@Test
public void demo4(){
int count = userDao.findCount();
System.out.println(count);
}
@Test
public void demo5(){
//String name = userDao.findNameById(2);//得到2号客户的名称
String name = userDao.findNameById(3);//得到3号客户的名称
System.out.println(name);
}
@Test
public void demo6(){
//String name = userDao.findNameById(2);//得到2号客户的User对象.
//User user = userDao.findById(2);//得到2号客户的User对象.
User user = userDao.findById(3);//得到3号客户的User对象.
System.out.println(user);
}
@Test
public void demo7(){
//String name = userDao.findNameById(2);//得到2号客户的User对象.
//User user = userDao.findById(2);//得到2号客户的User对象.
List<User> list = userDao.findAll();
for (User user : list) {
System.out.println(user);
}
}
}
<?xml version="1.0" encoding="UTF-8"?>
<!-- 引入beans的头 -->
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 配置Spring默认的连接池 -->
<!-- 这个类由Spring来帮我们创建,它默认情况下只创建一次,因为是单例的. -->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
<property name="url" value="jdbc:mysql:///spring3_day02"></property>
<property name="username" value="root"></property>
<property name="password" value=""></property>
</bean>
<!-- 配置DBCP连接池 -->
<bean id="dataSource1" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
<property name="url" value="jdbc:mysql:///spring3_day02"></property>
<property name="username" value="root"></property>
<property name="password" value=""></property>
</bean>
<!--
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="classpath:jdbc.properties">--><!-- jdbc.properties也是在src下 --><!-- </property>
</bean>
-->
<context:property-placeholder location="classpath:jdbc.properties"/>
<!-- 配置C3P0连接池 -->
<bean id="dataSource2" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<!--
<property name="driverClass" value="com.mysql.jdbc.Driver"></property>
-->
<property name="driverClass" value="${jdbc.driver}"></property>
<!--
<property name="jdbcUrl" value="jdbc:mysql:///spring3_day02"></property>
-->
<property name="jdbcUrl" value="${jdbc.url}"></property>
<!--
<property name="user" value="root"></property>
-->
<property name="user" value="${jdbc.user}"></property>
<!--
<property name="password" value=""></property>
-->
<property name="password" value="${jdbc.password}"></property>
</bean>
<!-- 定义jdbctemplate -->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource2"></property><!-- 把上面定义好的连接池注入进来了 -->
</bean>
<bean id="userDao" class="cn.itcast.spring3.demo2.UserDao">
<property name="jdbcTemplate" ref="jdbcTemplate"></property>
</bean>
</beans>
jdbc.driver = com.mysql.jdbc.Driver
jdbc.url = jdbc:mysql:///spring3_day02
jdbc.user = root
jdbc.password =
