写在开始：
今天学习了一下springboot，从网上找各种资料，视频，系统的学习了springboot入门，springboot controller,springboot过滤器，监听器，springboot JDBC连接数据库，JPA连接数据库，MyBatis连接数据库等相关知识，通过网上的资料自己动手敲了一遍，慢慢从helloworld到成功实现对数据库的增删改查，但我觉得还是mybatis用的比较多一些，springboot连接mybatis真的是纯注解式开发，个人觉得很简单方便有效。这里主要记录springboot整合mybatis实现对数据库的增删改查。
正文：
首先用maven构建springboot项目：
2.选择构建工具Maven Project、Spring Boot版本1.5.8以及一些工程基本信息，点击“Switch to the full version.”java版本选择1.8，可参考下图所示：
3.点击Generate Project下载项目压缩包，解压之后导入你得开发工具中即可。
运行截图：
4.运行成功之后，首选需要在SpringBoot的启动类里面增加用来扫描Mapper接口的注解，用来扫描Mapper包下面的接口。
5.在application.properties配置文件中添加数据库的支持.
6.pom.xml文件中添加相应的jar包,主要是添加mybatis的相关jar
7.准备工作完成之后就可以写代码了：
实体类代码如下：
package com.joy.entity;
import java.util.Date;
public class UserEntity {
private long userId;
private String userCode;
private String userName;
private String nickName;
private String userPwd;
private Date createDate;
private Date updateDate;
public long getUserId() {
return userId;
}
public void setUserId(long userId) {
this.userId = userId;
}
public String getUserCode() {
return userCode;
}
public void setUserCode(String userCode) {
this.userCode = userCode;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getNickName() {
return nickName;
}
public void setNickName(String nickName) {
this.nickName = nickName;
}
public String getUserPwd() {
return userPwd;
}
public void setUserPwd(String userPwd) {
this.userPwd = userPwd;
}
public Date getCreateDate() {
return createDate;
}
public void setCreateDate(Date createDate) {
this.createDate = createDate;
}
public Date getUpdateDate() {
return updateDate;
}
public void setUpdateDate(Date updateDate) {
this.updateDate = updateDate;
}
}
数据库sql命令：
SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`user_id` int(10) NOT NULL AUTO_INCREMENT,
`user_code` varchar(20) DEFAULT NULL,
`user_name` varchar(20) DEFAULT NULL,
`nick_name` varchar(20) DEFAULT NULL,
`user_pwd` varchar(20) DEFAULT NULL,
`create_date` datetime DEFAULT NULL,
`update_date` datetime DEFAULT NULL,
PRIMARY KEY (`user_id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES ('1', '10001', 'user10001', 'no1', '123456', '2017-10-22 15:23:32', '2017-11-07 15:23:35');
INSERT INTO `user` VALUES ('2', '10002', 'user10002', 'no2', '123456', '2017-10-22 15:23:32', '2017-11-07 15:23:35');
接下来就是最重要的编写Mapper接口，我们这里采用通过注解来实现数据库的增删改查功能。
package com.joy.dao;
import java.util.List;
import java.util.Map;
import org.apache.ibatis.annotations.*;
import com.joy.entity.UserEntity;
public interface UserMapper {
@Select("select * from user ")
@Results({
@Result(property = "userId", column = "user_id"),
@Result(property = "nickName", column = "nick_name"),
@Result(property = "userCode", column = "user_code"),
@Result(property = "userName", column = "user_name"),
@Result(property = "userPwd", column = "user_pwd"),
@Result(property = "createDate", column = "create_date"),
@Result(property = "updateDate", column = "update_date") })
public List<UserEntity> queryList();
@Select("SELECT * FROM USER WHERE user_id = #{userId}")
@Results({
@Result(property = "userId", column = "user_id"),
@Result(property = "nickName", column = "nick_name"),
@Result(property = "userCode", column = "user_code"),
@Result(property = "userName", column = "user_name"),
@Result(property = "userPwd", column = "user_pwd"),
@Result(property = "createDate", column = "create_date"),
@Result(property = "updateDate", column = "update_date") })
UserEntity findById(long userId);
@Insert("INSERT INTO USER(nick_name, user_code) VALUES(#{nickName}, #{userCode})")
int insertParam(@Param("nickName") String nickName, @Param("userCode") String userCode);
@Insert("INSERT INTO USER(nick_name, user_code) VALUES(#{nickName,jdbcType=VARCHAR}, #{userCode,jdbcType=INTEGER})")
int insertByMap(Map<String, Object> map);
@Insert("insert into user(nick_name,user_code,user_name,user_pwd,create_date,update_date) values(#{nickName},#{userCode},#{userName},#{userPwd},#{createDate},#{updateDate})")
public int insertEntity(UserEntity entity);
@Update("UPDATE user SET nick_name=#{nickName} WHERE user_id=#{userId}")
int updateEntity(UserEntity user);
@Delete("DELETE FROM user WHERE user_id =#{userId}")
int delete(Long userId);
@Delete("DELETE FROM user WHERE user_id =#{userId}")
int deleteEntity(UserEntity entity);
}
service层代码：
package com.joy.service;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.joy.dao.UserMapper;
import com.joy.entity.UserEntity;
@Service
public class UserService {
@Autowired(required = false)
private UserMapper mapper;
public List<UserEntity> queryList(){
List<UserEntity> userList=mapper.queryList();
return userList;
}
public UserEntity findById(long userId){
System.out.println("userId:"+userId);
return mapper.findById(userId);
}
public int insertEntity() {
UserEntity entity=new UserEntity();
entity.setUserName("lisi");
entity.setUserCode("lisi"+new Date());
entity.setNickName("郭靖");
entity.setUserPwd("123");
entity.setCreateDate(new Date());
entity.setUpdateDate(new Date());
return mapper.insertEntity(entity);
}
public int insertParam() {
return mapper.insertParam("linzhiqiang","lzq");
}
public int insertByMap() {
Map<String, Object> map=new HashMap<String, Object>();
map.put("nickName","zhaotong");
map.put("userCode","zt");
return mapper.insertByMap(map);
}
public int updateEntity() {
UserEntity entity=new UserEntity();
entity.setUserId(1);
entity.setNickName("郭靖");
return mapper.updateEntity(entity);
}
public int deleteEntity() {
UserEntity entity=new UserEntity();
entity.setUserId(11);
return mapper.deleteEntity(entity);
}
}
controller层代码：
package com.joy.controller;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import com.github.pagehelper.PageHelper;
import com.joy.entity.UserEntity;
import com.joy.service.UserService;
@RestController
public class UserController {
@Autowired
private UserService userService;
@RequestMapping("/userlist")
public List<UserEntity> queryList(){
PageHelper.startPage(1, 2);
return userService.queryList();
}
@RequestMapping(value="/queryUser/{userId}",method=RequestMethod.GET)
public UserEntity queryUserEntity(@PathVariable long userId){
UserEntity userEntity=userService.findById(userId);
return userEntity;
}
@RequestMapping("/insert")
public int insertEntity() {
return userService.insertEntity();
}
@RequestMapping("/insertParam")
public int insertParam() {
return userService.insertParam();
}
@RequestMapping("/insertByMap")
public int insertByMap() {
return userService.insertByMap();
}
@RequestMapping("/updateEntity")
public int updateEntity() {
return userService.updateEntity();
}
@RequestMapping("/deleteEntity")
public int deleteEntity() {
return userService.deleteEntity();
}
}
8.执行结果：
分页查询结果：
带参数查询结果：
写在最后：通过今天的学习，简单的了解了springboot的实用性，感觉真的很简洁，继续学习springboot,积累点滴。
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