javaEE Spring，JDBC，JdbcTemplate实现增删改查，JdbcTemplate配置

UserDaoImpl.java（Dao层实现类）：

package cn.xxx.jdbctemplate;
 
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 cn.xxx.bean.User;
//使用JdbcTemplate模板实现增删改查
public class UserDaoImpl implements UserDao {
	
	private JdbcTemplate jt;

	@Override
	//添加
	public void save(User u) {
		String sql = "insert into t_user values(null,?) ";
		jt.update(sql, u.getName());
	}
	
	@Override
	//删除
	public void delete(Integer id) {
		String sql = "delete from t_user where id = ? ";
		jt.update(sql,id);
	}
	
	@Override
	//修改
	public void update(User u) {
		String sql = "update  t_user set name = ? where id=? ";
		jt.update(sql, u.getName(),u.getId());
	}
	
	@Override
	//根据id查询一条记录
	public User getById(Integer id) {
		String sql = "select * from t_user where id = ? ";
		return jt.queryForObject(sql,new RowMapper<User>(){
			@Override
			public User mapRow(ResultSet rs, int index) throws SQLException {
				User u = new User();
				u.setId(rs.getInt("id"));
				u.setName(rs.getString("name"));
				return u;
			}}, id);   //RowMapper类似于QueryRunner的query方法中的xxxHandler
	}
	
	@Override
	//查询总数
	public int getTotalCount() {
		String sql = "select count(*) from t_user  ";
		Integer count = jt.queryForObject(sql, Integer.class);
		return count;
	}
 
	@Override
	//查询所有
	public List<User> getAll() {
		String sql = "select * from t_user  ";
		List<User> list = jt.query(sql, new RowMapper<User>(){
			@Override
			public User mapRow(ResultSet rs, int index) throws SQLException {
				User u = new User();
				u.setId(rs.getInt("id"));
				u.setName(rs.getString("name"));
				return u;
			}});
		return list;
	}
	
	public void setJt(JdbcTemplate jt) {
		this.jt = jt;
	}
	
}

src/applicationContext.xml（Spring配置文件,将JdbcTemplate配置到Spring容器中）：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd ">
	
	<!-- 1.将(c3p0)连接池放入spring容器 -->
	<bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" >
		<property name="jdbcUrl" value="jdbc:mysql:///数据库名" ></property>
		<property name="driverClass" value="com.mysql.jdbc.Driver" ></property>
		<property name="user" value="root" ></property>
		<property name="password" value="1234" ></property>
	</bean>
	
	<!-- 2.将JDBCTemplate放入spring容器 -->
	<bean name="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate" >
		<property name="dataSource" ref="dataSource" ></property>
	</bean>
	
	<!-- 3.将UserDao放入spring容器 -->
	<bean name="userDao" class="cn.xxx.jdbctemplate.UserDaoImpl" >
		<property name="jt" ref="jdbcTemplate" ></property>
	</bean>

</beans>

Test.java（测试类）：

package cn.xxx.jdbctemplate;

import javax.annotation.Resource;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import cn.xxx.bean.User;

//演示JDBC模板
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class Test {
	@Resource(name="userDao")
	//属性注入(引用类型)
	private UserDao ud;
	
	@Test
	public void fun1() throws Exception{
		User u = new User();
		u.setName("tom");
		ud.save(u);
	}
	
	@Test
	public void fun2() throws Exception{
		User u = new User();
		u.setId(2);
		u.setName("jack");
		ud.update(u);
		
	}
	
	@Test
	public void fun3() throws Exception{
		ud.delete(2);
	}
	
	@Test
	public void fun4() throws Exception{
		System.out.println(ud.getTotalCount());
	}
	
	@Test
	public void fun5() throws Exception{
		System.out.println(ud.getById(1));
	}
	
	@Test
	public void fun6() throws Exception{
		System.out.println(ud.getAll());
	}
	
}