NamedParameterJdbcTemple与RowMapper实现

NamedParameterJdbcTemplate和JdbcTemplate功能基本差不多。

 1、配置

db.properties

jdbc.user=root
jdbc.password=123456
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.jdbcUrl=jdbc:mysql:///test

 

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.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-4.3.xsd">

    <context:property-placeholder location="classpath:db.properties"/>
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="user" value="${jdbc.user}"></property>
        <property name="password" value="${jdbc.password}"></property>
        <property name="driverClass" value="${jdbc.driverClass}"></property>
        <property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
    </bean>
    
    <!-- NamedParameterJdbcTemplate有一个带有DataSource的构造器 -->
    <bean id="namedParameterJdbcTemplate" class="org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate">
        <constructor-arg ref="dataSource"></constructor-arg>
    </bean>
</beans>

 

2、RowMapper实现对象关系映射查询

public class UserDaoImpl implements UserDao{
    
	@Resource
	private NamedParameterJdbcTemplate namedParameterJdbcTemplate;

	private RowMapper<User> userRowMapper = new RowMapper<User>(){
		
		@Override
		public User mapRow(ResultSet rs,int rowNum) throws SQLException{
			User user = new User();
			user.setId = rs.getString("id");
			user.setUserName = rs.getString("userName");
			user.setPassword = rs.getString("password");
			return user;
		}
		
	}
	
	public List<User> getUserList(String userName){
		String sql = "SELECT * FROM t_user where userName = :userName";
		Map<String,Object> map = new HashMap<String,Object>();
		map.put("userName",userName);
		return namedParameterJdbcTemplate.query(sql,map,userRowMapper);
	}
	

}

3、实现更新与对象设置属性

Java代码

//启动IoC容器
ApplicationContext ctx=new ClassPathXmlApplicationContext("applicationContext.xml");

NamedParameterJdbcTemplate namedParameterJdbcTemplate=ctx.getBean(NamedParameterJdbcTemplate.class);
//为变量名称前面加上冒号
String sql="insert into user (name,deptid) values (:name,:deptid)";
//定义map集合，其参数名称为sql语句中变量的名称
Map<String,Object> paramMap=new HashMap<String,Object>();
paramMap.put("name", "caoyc");
paramMap.put("deptid", 2);
namedParameterJdbcTemplate.update(sql, paramMap);

方式二:

//启动IoC容器
ApplicationContext ctx=new ClassPathXmlApplicationContext("applicationContext.xml");

NamedParameterJdbcTemplate namedParameterJdbcTemplate=ctx.getBean(NamedParameterJdbcTemplate.class);
//为变量名称前面加上冒号
String sql="insert into user (name,deptid) values (:name,:deptid)";
//定义个实体类
User user=new User();
user.setName("zhh");
user.setDeptid(3);

SqlParameterSource paramSource=new BeanPropertySqlParameterSource(user);
namedParameterJdbcTemplate.update(sql, paramSource);

 

Reference：

[1] 追风-, Spring 中的 RowMapper, http://blog.csdn.net/yajunren/article/details/10103035
[2] HappyBKs, Spring框架笔记（二十五）——NamedParameterJdbcTemplate与具名参数, https://my.oschina.net/happyBKs/blog/497798
[3] JustDo, Spring NamedParameterJdbcTemplate详解, http://www.cnblogs.com/caoyc/p/5630957.html