Spring 框架系列之 JDBC 整合实例

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1、Spring框架整合 DAO 模板

  • JDBC:org.springframework.jdbc.core.JdbcTemplate
  • Hibernate3.0:org.springframework.orm.hibernate3.HibernateTemplate
  • MyBatis:org.springframework.orm.ibatis.SqlMapClientTemplate
  • JPA:org.springframework.orm.jpa.JpaTemplate

2、JdbcTemplate 模板整合 JDBC 实例

(1)、新建web项目,导入所需要的 jar 包,如下图所示:

Spring 框架系列之 JDBC 整合实例

(2)、在 MySQL 数据库 JdbcTemplateDB 中新建数据表 t_user, 如下图所示:

Spring 框架系列之 JDBC 整合实例

(3)、新建一个 bean 类,具体代码如下:

User.java

package com.spring.bean;

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 + "]";
}
}

(4)、书写 DAO 接口,代码如下:

UserDao.java

package com.spring.dao;

import java.util.List;

import com.spring.bean.User;

public interface UserDao {

    //增
void save(User u);
//删
void delete(Integer id);
//改
void update(User u);
//查
User getById(Integer id);
//查
int getTotalCount();
//查
List<User> getAll();
}

(5)、书写一个类实现 DAO 接口,代码如下:

UserDaoImpl.java

package com.spring.dao;

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; import com.spring.bean.User; //使用JDBC模板实现增删改查
public class UserDaoImpl extends JdbcDaoSupport implements UserDao {
public void save(User u) {
String sql = "insert into t_user values(null,?) ";
super.getJdbcTemplate().update(sql, u.getName());
}
public void delete(Integer id) {
String sql = "delete from t_user where id = ? ";
super.getJdbcTemplate().update(sql,id);
}
public void update(User u) {
String sql = "update t_user set name = ? where id=? ";
super.getJdbcTemplate().update(sql, u.getName(),u.getId());
}
public User getById(Integer id) {
String sql = "select * from t_user where id = ? ";
return super.getJdbcTemplate().queryForObject(sql,new RowMapper<User>(){
public User mapRow(ResultSet rs, int arg1) throws SQLException {
User u = new User();
u.setId(rs.getInt("id"));
u.setName(rs.getString("name"));
return u;
}}, id); }
public int getTotalCount() {
String sql = "select count(*) from t_user ";
Integer count = super.getJdbcTemplate().queryForObject(sql, Integer.class);
return count;
} public List<User> getAll() {
String sql = "select * from t_user ";
List<User> list = super.getJdbcTemplate().query(sql, new RowMapper<User>(){
public User mapRow(ResultSet rs, int arg1) throws SQLException {
User u = new User();
u.setId(rs.getInt("id"));
u.setName(rs.getString("name"));
return u;
}});
return list;
}
}

(6)、新建数据库驱动链接资源文件,代码如下:

db.properties

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

(7)、书写 Spring 配置文件,代码如下:

applicationContext.xml

<?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 "> <!-- 指定spring读取db.properties配置 -->
<context:property-placeholder location="classpath:db.properties" /> <!-- 1.将数据库连接池放入spring容器 -->
<bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" >
<property name="jdbcUrl" value="${jdbc.jdbcUrl}" ></property>
<property name="driverClass" value="${jdbc.driverClass}" ></property>
<property name="user" value="${jdbc.user}" ></property>
<property name="password" value="${jdbc.password}" ></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="com.spring.dao.UserDaoImpl" >
<property name="dataSource" ref="dataSource" ></property>
</bean> </beans>

(8)、新建测试类进行测试,代码如下:

TestDemo.java

package com.spring.test;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; import com.mchange.v2.c3p0.ComboPooledDataSource;
import com.spring.bean.User;
import com.spring.dao.UserDao; //演示JDBC模板
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class TestDemo { @Autowired
private UserDao ud; @Test
public void fun1() throws Exception{ //1、准备连接池
ComboPooledDataSource dataSource = new ComboPooledDataSource();
dataSource.setDriverClass("com.mysql.jdbc.Driver");
dataSource.setJdbcUrl("jdbc:mysql:///JdbcTemplateDB");
dataSource.setUser("root");
dataSource.setPassword("root");
//2、创建JDBC模板对象
JdbcTemplate jt = new JdbcTemplate();
jt.setDataSource(dataSource);
//3、书写sql语句,并执行
String sql = "insert into t_user values(null,'rose') ";
jt.update(sql); } @Test
public void fun2() throws Exception{
User u = new User();
u.setName("tom");
ud.save(u);
}
@Test
public void fun3() throws Exception{
User u = new User();
u.setId(2);
u.setName("jack");
ud.update(u); } @Test
public void fun4() throws Exception{
ud.delete(2);
} @Test
public void fun5() throws Exception{
System.out.println(ud.getTotalCount());
} @Test
public void fun6() throws Exception{
System.out.println(ud.getById(1));
} @Test
public void fun7() throws Exception{
System.out.println(ud.getAll());
}
}

(9)、配置依赖关系与使用图解:

Spring 框架系列之 JDBC 整合实例

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