Spring使用JdbcTemplate实现数据库的增删改查（使用注解的形式）
直接上代码，首先是工程目录
这里我用了MyEclipse自带的spring包。并从外部导入了mysql驱动包mysql-connector-java-5.1.46.jar和数据库连接池所用的jar包mchange-commons-java-0.2.3.4.jar
创建数据库并插入数据（用navcat导出的sql文件，可以直接使用）
-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin NULL DEFAULT NULL,
`sex` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin NULL DEFAULT NULL,
`age` int(11) NULL DEFAULT NULL,
PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_bin ROW_FORMAT = Dynamic;
-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES (1, '张三', '男', 18);
INSERT INTO `user` VALUES (2, '李四', '男', 20);
INSERT INTO `user` VALUES (3, '王芳', '女', 19);
实体类User.java
package com.wang.entity;
import java.io.Serializable;
import org.springframework.stereotype.Component;
@Component("user")
public class User implements Serializable{
private int id;
private String name;
private String sex;
private int age;
public User() {
}
public User(String name, String sex, int age) {
super();
this.name = name;
this.sex = sex;
this.age = age;
}
//重写toString方法
public String toString() {
return "User [id=" + id + ", name=" + name + ", sex=" + sex + ", age=" + age + "]";
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
从数据库查找user类所用的结果集合类
package com.wang.entity;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.springframework.jdbc.core.RowMapper;
public class UserRow implements RowMapper<User> {
@Override
public User mapRow(ResultSet arg0, int arg1) throws SQLException {
User user = new User();
user.setName(arg0.getString("name"));
user.setSex(arg0.getString("sex"));
user.setAge(arg0.getInt("age"));
return user;
}
}
spring配置文件application.xml（需要注意的是引入所需要的命名空间）
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
<context:component-scan base-package="com" />
<bean id="dateSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass">
<value>com.mysql.jdbc.Drivervalue>
property>
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/springtest">property>
<property name="user" value="root" />
<property name="password" value="root" />
bean>
<bean id="template" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dateSource">property>
bean>
beans>
dao层代码UserDao.java
package com.dao;
import java.util.Iterator;
import java.util.List;
import javax.annotation.Resource;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;
import com.wang.entity.User;
import com.wang.entity.UserRow;
@Repository("userDao")
public class UserDao {
@Resource(name = "template")
JdbcTemplate jdbcTemplate;
// 添加的方法
public void add(User user) {
jdbcTemplate.update("insert into user (name,sex,age) values(?,?,?)", user.getName(), user.getSex(),
user.getAge());
}
// 删除的方法（根据id删除）
public void delete(int id) {
jdbcTemplate.update("delete from user where id=?", id);
}
// 修改
public void update(User user) {
jdbcTemplate.update("update user set name = ?,sex = ?,age = ? where id = ?", user.getName(), user.getSex(), user.getAge(),user.getId());
}
// 查找所有数据（需要用一个RowMap来接收user类）
public void findAll() {
List<User> list = jdbcTemplate.query("select * from user", new UserRow());
Iterator<User> it = list.iterator();
while (it.hasNext()) {
User user = (User) it.next();
System.out.println(user);
}
}
}
UserService.java
package com.service;
import javax.annotation.Resource;
import org.springframework.stereotype.Service;
import com.dao.UserDao;
import com.wang.entity.User;
@Service("userService")
public class UserService {
@Resource(name = "userDao")
UserDao userDao;
public void add(User user) {
userDao.add(user);
System.out.println("add.....");
}
public void delete(int id) {
userDao.delete(id);
System.out.println("delete.....");
}
public void update(User user) {
userDao.update(user);
System.out.println("update.....");
}
public void findAll() {
userDao.findAll();
}
}
测试类
package Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.service.UserService;
import com.wang.entity.User;
public class Test01 {
public static void main(String[] args) {
ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");//读取配置文件
UserService userService = (UserService) ac.getBean("userService");
//添加
User user = new User("邓五","女", 18);
// userService.add(user);
//修改
// User user1 = new User("邓四","女", 18);
// user.setId(4);//因为是根据id来修改数据所以要保存所需要修改数据的id
// userService.update(user1);
//删除
// userService.delete(4);
//查找
userService.findAll();
}
}
工程已上传，可自行下载https://github.com/1419908068/java/tree/852fdbc7449a516f406f82cb03fc5907d8d37ab0