SpringBoot中利用MyBatis进行数据操作的示例

##数据库连接配置(部署到哪台，对应的ip需修改)
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/mybatis?connectTimeout=1000&useSSL=false&useUnicode=true&characterEncoding=UTF-8
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver=com.mysql.jdbc.Driver

package com.example.demo.model;

public class User {
 private int id;
 private String name;
 private String sex;
 private int age;

 public User() {
 }

 public User(String name, String sex, int age) {
  this.name = name;
  this.sex = sex;
  this.age = age;
 }

 public User(int id, String name, String sex, int age) {
  this.id = id;
  this.name = name;
  this.sex = sex;
  this.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;
 }
}

package com.example.demo.mapper;

import com.example.demo.model.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;

@Mapper
public interface UserMapper {
 User getByName(@Param("name") String name);

 boolean insert(User user);

 boolean update(@Param("name") String name, @Param("sex") String sex, @Param("age") int age);

 void delete(@Param("name") String name);
}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.demo.mapper.UserMapper">
 <select id="getByName" resultType="com.example.demo.model.User" parameterType="java.lang.String">
  SELECT * FROM tb_user WHERE name = #{name}
 </select>

 <insert id="insert" parameterType="com.example.demo.model.User" useGeneratedKeys="true">
  INSERT INTO tb_user(name, sex, age) VALUES(#{name}, #{sex}, #{age})
 </insert>

 <update id="update" parameterType="com.example.demo.model.User">
  UPDATE tb_user SET sex=#{sex}, age=#{age} WHERE name=#{name}
 </update>

 <delete id="delete" parameterType="java.lang.String">
  DELETE FROM tb_user WHERE name = #{name}
 </delete>
</mapper>

 <build>
 <resources> 
  <!-- maven项目中src源代码下的xml等资源文件编译进classes文件夹，
   注意：如果没有这个，它会自动搜索resources下是否有mapper.xml文件，
   如果没有就会报org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): ... -->
  <resource> 
  <directory>src/main/java</directory> 
  <includes> 
   <include>**/*.xml</include> 
  </includes> 
  <filtering>true</filtering>
  </resource>
  
  <!--将resources目录下的配置文件编译进classes文件 --> 
  <resource>
   <directory>src/main/resources</directory>
   <filtering>true</filtering>
  </resource>
 </resources> 
 </build> 

package com.example.demo.service;

import com.example.demo.model.User;

public interface UserService {
 User getUserByName(String name);

 boolean addUser(User user);

 boolean updateUser(String name, String sex, int age);

 void deleteUser(String name);
}

package com.example.demo.service.impl;

import com.example.demo.mapper.UserMapper;
import com.example.demo.model.User;
import com.example.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService{
 @Autowired
 UserMapper userMapper;

 @Override
 public User getUserByName(String name) {
  User user = userMapper.getByName(name);
  if (null != user){
   return user;
  }
  return null;
 }

 @Override
 public boolean addUser(User user) {
  return userMapper.insert(user);
 }

 @Override
 public boolean updateUser(String name, String sex, int age) {
  return userMapper.update(name, sex, age);
 }

 @Override
 public void deleteUser(String name) {
  userMapper.delete(name);
 }
}

package com.example.demo.controller;

import com.example.demo.model.User;
import com.example.demo.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.RestController;

@RestController
public class UserController {
 @Autowired
 UserService userService;

 @RequestMapping(value = "/index", method = RequestMethod.GET)
 public String index(){
  User user = userService.getUserByName("gyl");
  return user.getName()+"--"+user.getSex()+"--"+user.getAge();
 }
}

package com.example.demo.mapper;

import com.example.demo.model.User;
import org.apache.ibatis.annotations.*;

@Mapper
public interface UserMapper {

 @Select("select * from TB_USER where NAME = #{name}")
 User getByName(@Param("name") String name);

 @Insert("insert into TB_USER(NAME, SEX, AGE) values(#{name}, #{sex}, #{age})")
 boolean insert(User user);

 @Update("update TB_USER set SEX=#{sex}, AGE=#{age} where NAME=#{name}")
 boolean update(@Param("name") String name, @Param("sex") String sex, @Param("age") int age);

 @Delete("delete from TB_USER where NAME = #{name}")
 void delete(@Param("name") String name);
}