spring教程--JdbcTemplate详解

Spring的JdbcTemplate

JdbcTemplate模板与DbUtils工具类比较类似.
1 Spring对持久层技术支持:

JDBC:org.springframework.jdbc.core.JdbcTemplate

Hibernate3.0:org.springframework.orm.hibernate3.HibernateTemplate

IBatis(MyBatis):org.springframework.orm.ibatis.SqlMapClientTemplate

JPA:org.springframe work.orm.jpa.JpaTemplate
2 开发JDBCTemplate入门:

第一步:引入相应jar包:

spring-tx-3.2.0.RELEASE.jar
spring-jdbc-3.2.0.RELEASE.jar
mysql驱动.

第二步:创建applicationContext.xml

扫描二维码关注公众号，回复： 2663711 查看本文章

JdbcTemplate

第三步:编写一个测试类:

package com.sihai.spring3.demo1;  

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.jdbc.core.JdbcTemplate;  
import org.springframework.jdbc.datasource.DriverManagerDataSource;  
import org.springframework.test.context.ContextConfiguration;  
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;  

@RunWith(SpringJUnit4ClassRunner.class)  
@ContextConfiguration("classpath:applicationContext.xml")  
public class SpringTest1 {  

    @Autowired  
    @Qualifier("jdbcTemplate")  
    private JdbcTemplate jdbcTemplate;  

    @Test  
    public void demo2(){  
        jdbcTemplate.execute("create table user (id int primary key auto_increment,name varchar(20))");  
    }  

    @Test  
    public void demo1(){  
        // 创建连接池:  
        DriverManagerDataSource dataSource = new DriverManagerDataSource();  
        // 设置参数:  
        dataSource.setDriverClassName("com.mysql.jdbc.Driver");  
        dataSource.setUrl("jdbc:mysql:///spring3_day02");  
        dataSource.setUsername("root");  
        dataSource.setPassword("123");  

        // 使用JDBC的模板:  
        JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);  
        jdbcTemplate.execute("create table user (id int primary key auto_increment,name varchar(20))");  
    }  
}

2.1 配置连接池:
Spring默认的连接池:

<!-- 配置Spring默认的连接池 -->  

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">  

<property name="driverClassName" value="com.mysql.jdbc.Driver"/>  

<property name="url" value="jdbc:mysql:///spring3_day02"/>  

<property name="username" value="root"/>  

<property name="password" value="123"/>  

</bean>

DBCP连接池:

导入jar包:

com.springsource.org.apache.commons.dbcp-1.2.2.osgi.jar
com.springsource.org.apache.commons.pool-1.5.3.jar

C3P0连接池:

导入jar包:

com.springsource.com.mchange.v2.c3p0-0.9.1.2.jar

2.2 参数设置到属性文件中:

在src下创建jdbc.properties

jdbc.driver = com.mysql.jdbc.Driver  

jdbc.url = jdbc:mysql:///spring3_day02  

jdbc.user = root  

jdbc.password = 123

需要在applicationContext.xml 中使用属性文件配置的内容.

第一种写法:

<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">  

          <property name="location" value="classpath:jdbc.properties"></property>  

</bean>

第二种写法:

<context:property-placeholder location="classpath:jdbc.properties"/>

2.3 JdbcTemplate的CRUD的操作:

Spring框架中提供了对持久层技术支持的类:

JDBC:org.springframework.jdbc.core.support.JdbcDaoSupport

Hibernate 3.0:org.springframework.orm.hibernate3.support.HibernateDaoSupport

iBatis:org.springframework.orm.ibatis.support.SqlMapClientDaoSupport

2.3.1 编写DAO的时候:

Public class UserDao extends JdbcDaoSupport{

}

进行CRUD的操作;

保存:update(String sql,Object… args)
修改:update(String sql,Object… args)
删除:update(String sql,Object… args)

2.3.2 查询:

简单查询:

select count(*) from user;— queryForInt(String sql);
select name from user where id = ?;— queryForObject(String sql,Class clazz,Object… args);

复杂查询:(返回对象,和对象集合)
select * from user where id = ?— queryForObjectString sql,RowMapper rowMapper,Object… args);

select * from user;— query(String sql,RowMapper rowMapper,Object… args);

package com.sihai.spring3.demo2;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.support.JdbcDaoSupport;

public class UserDao extends JdbcDaoSupport{

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 = this.getJdbcTemplate().queryForObject(sql, new UserRowMapper(), id);  
    return user;  
}  

public List<User> findAll(){  
    String sql = "select * from user";  
    return this.getJdbcTemplate().query(sql, new UserRowMapper());  
}  

class UserRowMapper implements RowMapper<User>{  
    /** 
     * rs:结果集. 
     * rowNum:行号 
     */  
    public User mapRow(ResultSet rs, int rowNum) throws SQLException {  
        User user = new User();  
        user.setId(rs.getInt("id"));  
        user.setName(rs.getString("name"));  
        return user;  
    }  

}

}

spring教程--JdbcTemplate详解

猜你喜欢