idea+SpringBoot整合Mybatis完成增刪改查功能
阿新 • • 發佈：2018-12-15
參考地址：https://blog.csdn.net/baidu_36216018/article/details/79466935
1.idea建立spring boot專案
2.pom.xml檔案：
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.example</groupId> <artifactId>shujuku</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>shujuku</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.3.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> </properties> <dependencies> <!-- web --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- mybatis --> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.1</version> </dependency> <!-- mysql --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
3.專案目錄結構：
4.表:表名：user
自己建立一個數據表 欄位為id ， name， password ，number 四個欄位 id為int型別，其他的都為String型別。
5.在src/main/java目錄下新增controller層，entity層，mapper層，service層
entity層的實體類User：
package com.example.shujuku.entity;
public class User {
private int id;
private String name;
private String password;
private String number;
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 getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getNumber() {
return number;
}
public void setNumber(String number) {
this.number = number;
}
@Override
public String toString() {
return "User [id=" + id + ", name=" + name + ", password=" + password + ", number=" + number + "]";
}
}
mapper層的UserMapper類：
package com.example.shujuku.mapper;
import java.util.List;
import com.example.shujuku.entity.User;
import org.apache.ibatis.annotations.Mapper;
@Mapper
public interface UserMapper {
List<User> findUserByName(String name);
public List<User> ListUser();
public int insertUser(User user);
public int delete(int id);
public int Update(User user);
}
service層的實現類Userservice：
package com.example.shujuku.service;
import java.util.List;
import com.example.shujuku.entity.User;
import com.example.shujuku.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class UserService {
@Autowired
public UserMapper userMapper;
public List<User> findByName(String name) {
return userMapper.findUserByName(name);
}
public User insertUser(User user) {
userMapper.insertUser(user);
return user;
}
public List<User> ListUser(){
return userMapper.ListUser();
}
public int Update(User user){
return userMapper.Update(user);
}
public int delete(int id){
return userMapper.delete(id);
}
}
controller層 的訪問類CRUD:
package com.example.shujuku.controller;
import java.util.List;
import com.example.shujuku.entity.User;
import com.example.shujuku.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping(value = "/crud", method = { RequestMethod.GET, RequestMethod.POST })
public class CRUD {
@Autowired
private UserService userservice;
@RequestMapping("/ListUser")
@ResponseBody
public List<User> ListUser(){
return userservice.ListUser();
}
@RequestMapping("/ListUserByname")
@ResponseBody
public List<User> ListUserByname(String name){
return userservice.findByName(name);
}
@RequestMapping(value = "/delete", method = RequestMethod.GET)
public String delete(int id) {
int result = userservice.delete(id);
if (result >= 1) {
return "刪除成功";
} else {
return "刪除失敗";
}
}
@RequestMapping(value = "/update", method = RequestMethod.POST)
public String update(User user) {
int result = userservice.Update(user);
if (result >= 1) {
return "修改成功";
} else {
return "修改失敗";
}
}
@RequestMapping(value = "/insert", method = RequestMethod.POST)
public User insert(User user) {
return userservice.insertUser(user);
}
}
接著：
在src/main/resources下寫UserMapper的對映檔案xml.
UserMapper.xml
<?xml version = "1.0" encoding = "UTF-8"?>
<!DOCTYPEmapperPUBLIC"-//mybatis.org//DTD com.example.Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.shujuku.mapper.UserMapper">
<resultMap id="result" type="com.example.shujuku.entity.User">
<result property="name" column="name" />
<result property="password" column="password" />
<result property="number" column="number"/>
</resultMap>
<select id="ListUser" resultMap="result">
SELECT * FROM user
</select>
<select id="findUserByName" resultMap="result">
SELECT * FROM user where name=#{name}
</select>
<insert id="insertUser" parameterType="com.example.shujuku.entity.User"
keyProperty="id" useGeneratedKeys="true">
INSERT INTO user
(
id,name,password,number
)
VALUES (
#{id},
#{name, jdbcType=VARCHAR},
#{password, jdbcType=VARCHAR},
#{number}
)
</insert>
<delete id="delete" parameterType="int">
delete from user where id=#{id}
</delete>
<update id="Update" parameterType="com.example.shujuku.entity.User">
update user set user.name=#{name},user.password=#{password},user.number=#{number} where user.id=#{id}
</update>
</mapper>
最後配置application.properties配置檔案：
spring.datasource.url = jdbc:mysql://localhost:3306/world spring.datasource.username = root spring.datasource.password = 123456 spring.datasource.driverClassName = com.mysql.jdbc.Driver spring.datasource.max-active=20 spring.datasource.max-idle=8 spring.datasource.min-idle=8 spring.datasource.initial-size=10 mybatis.mapper-locations= classpath:mapper/*.xml
啟動程式的入口類：SpringbootMybatisApplication.java