簡介

新增依賴

buildscript {
    ext {
        springBootVersion = '2.0.2.RELEASE'
    }
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
    }
}

apply plugin: 'java'
apply plugin: 'eclipse'
 

apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'

group = 'com.yanjun'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
    mavenCentral()
}


dependencies {
    compile('org.springframework.boot:spring-boot-starter',
            'org.springframework.boot:spring-boot-starter-web'
 
,
             )
    testCompile('org.springframework.boot:spring-boot-starter-test')

    runtime('mysql:mysql-connector-java')  //mysql驅動

    compile 'org.mybatis.spring.boot:mybatis-spring-boot-starter:1.3.0' //mybatis核心庫
    compile 'tk.mybatis:mapper-spring-boot-starter:2.0.2' //mapper
}

在application.yml

spring:
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/mybatis
    username: root
    password: 123456
    driver-class-name: com.mysql.jdbc.Driver
    sql-script-encoding: UTF-8

mapper:
  mappers:
    - tk.mybatis.mapper.common.Mapper
  not-empty: false
  identity: MYSQL

server:
  port: 8023

在 MybatisApplication新增掃包配置

package com.yanjun.mybatis;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import tk.mybatis.spring.annotation.MapperScan;

@SpringBootApplication
@MapperScan("com.yanjun.mybatis.mapper")

public class MybatisApplication {

    public static void main(String[] args) {
        SpringApplication.run(MybatisApplication.class, args);
    }
}

導包注意事項：

正確的事這個包

tk.mybatis.spring.annotation.MapperScan;

而不是

org.mybatis.spring.annotation.MapperScan;

實戰演練

建立實體類 User

package com.yanjun.mybatis.bean;

import tk.mybatis.mapper.annotation.KeySql;
import javax.persistence.Id;
import javax.persistence.Table;

@Table
public class User {

    @Id
    @KeySql(useGeneratedKeys = true)
    Integer id;

    String name;

    Integer age;

    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;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}

建立UserMapper

package com.yanjun.mybatis.mapper;

import com.yanjun.mybatis.bean.User;
import tk.mybatis.mapper.common.Mapper;
import tk.mybatis.mapper.common.MySqlMapper;

public interface UserMapper extends Mapper<User>, MySqlMapper<User> {

}

建立 UserService

package com.yanjun.mybatis.service;

import com.yanjun.mybatis.bean.User;
import com.yanjun.mybatis.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;

@Service
public class UserService {

    @Autowired
    UserMapper userMapper;

    public User get(int id) {
        return userMapper.selectByPrimaryKey(id);
    }

    public List<User> findAll() {
        List<User> userList = userMapper.selectAll();
        return userList;
    }

    public int insert(User user) {
        return userMapper.insert(user);
    }

    public int insert(List<User> list) {
        return userMapper.insertList(list);
    }

}

建立 UserController

package com.yanjun.mybatis.controller;

import com.yanjun.mybatis.bean.User;
import com.yanjun.mybatis.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController
public class UserController {

    @Autowired
    UserService userService;

    @GetMapping("get/{id}")
    public User getUser(@PathVariable("id") Integer id) {
        return userService.get(id);
    }

    @GetMapping("findAll")
    public List<User> getUser() {
        return userService.findAll();
    }

    @PostMapping("insert")
    public int insert(@RequestBody User user) {
        return userService.insert(user);
    }

}

總結

本文所有程式碼已經上傳至 GitHub ，分支 mapper

個人微訊號：zhaoyanjun125 , 歡迎關注