Mybatis-Plus usage of BaseMapper

1, how to use BaseMapper to operate the database.

2, how to make use of the UUID for BaseMapper primary key generated automatically when the entity is inserted.

Student entity class, which is the primary key attribute id UUID

package com.huixiaoer.ant.api.model.bean;

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;

public class Student {
    /**
     *
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column student.id
     *
     * @mbg.generated Thu Oct 31 14:09:39 CST 2019
     */
    @TableId(type= IdType.UUID)
    private String id;

    /**
     *
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column student.user_name
     *
     * @mbg.generated Thu Oct 31 14:09:39 CST 2019
     */
    private String userName;

    /**
     *
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column student.age
     *
     * @mbg.generated Thu Oct 31 14:09:39 CST 2019
     */
    private Integer age;

    /**
     *
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column student.phone
     *
     * @mbg.generated Thu Oct 31 14:09:39 CST 2019
     */
    private String phone;

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table student
     *
     * @mbg.generated Thu Oct 31 14:09:39 CST 2019
     */
    public Student(String id, String userName, Integer age, String phone) {
        this.id = id;
        this.userName = userName;
        this.age = age;
        this.phone = phone;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table student
     *
     * @mbg.generated Thu Oct 31 14:09:39 CST 2019
     */
    public Student() {
        super();
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method returns the value of the database column student.id
     *
     * @return the value of student.id
     *
     * @mbg.generated Thu Oct 31 14:09:39 CST 2019
     */
    public String getId() {
        return id;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method sets the value of the database column student.id
     *
     * @param id the value for student.id
     *
     * @mbg.generated Thu Oct 31 14:09:39 CST 2019
     */
    public void setId(String id) {
        this.id = id == null ? null : id.trim();
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method returns the value of the database column student.user_name
     *
     * @return the value of student.user_name
     *
     * @mbg.generated Thu Oct 31 14:09:39 CST 2019
     */
    public String getUserName() {
        return userName;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method sets the value of the database column student.user_name
     *
     * @param userName the value for student.user_name
     *
     * @mbg.generated Thu Oct 31 14:09:39 CST 2019
     */
    public void setUserName(String userName) {
        this.userName = userName == null ? null : userName.trim();
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method returns the value of the database column student.age
     *
     * @return the value of student.age
     *
     * @mbg.generated Thu Oct 31 14:09:39 CST 2019
     */
    public Integer getAge() {
        return age;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method sets the value of the database column student.age
     *
     * @param age the value for student.age
     *
     * @mbg.generated Thu Oct 31 14:09:39 CST 2019
     */
    public void setAge(Integer age) {
        this.age = age;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method returns the value of the database column student.phone
     *
     * @return the value of student.phone
     *
     * @mbg.generated Thu Oct 31 14:09:39 CST 2019
     */
    public String getPhone() {
        return phone;
    }

    /**
     * This method was generated by MyBatis Generator.
     * This method sets the value of the database column student.phone
     *
     * @param phone the value for student.phone
     *
     * @mbg.generated Thu Oct 31 14:09:39 CST 2019
     */
    public void setPhone(String phone) {
        this.phone = phone == null ? null : phone.trim();
    }
}

StudnetVI entity class, the user receives a page from the parameter

package com.huixiaoer.ant.api.model.vi;

import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;

@ApiModel(value = "student对象",description = "学生对象student")
public class StudentVI {


    /**
     *
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column student.user_name
     *
     * @mbg.generated Thu Oct 31 14:09:39 CST 2019
     */
    @ApiModelProperty(value="学生姓名",name="userName",required=true)
    private String userName;

    /**
     *
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column student.age
     *
     * @mbg.generated Thu Oct 31 14:09:39 CST 2019
     */
    @ApiModelProperty(value="年龄",name="age",required=true)
    private Integer age;

    /**
     *
     * This field was generated by MyBatis Generator.
     * This field corresponds to the database column student.phone
     *
     * @mbg.generated Thu Oct 31 14:09:39 CST 2019
     */
    @ApiModelProperty(value="手机号",name="phone",required=true)
    private String phone;


    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public Integer getAge() {
        return age;
    }

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

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

}

StudentPlusMapper interface class, to achieve BaseMapper Mybatis-Plus to implement enhancements.

Package com.huixiaoer.ant.api.repository.mysql.mapper; 

Import com.baomidou.mybatisplus.core.mapper.BaseMapper;
 Import com.huixiaoer.ant.api.model.bean.Student; 

public  interface StudentPlusMapper the extends BaseMapper <Student > {
     // need not be implemented, this time can be called to change the check deletions baseMapper 
}

StudentService business interface class

package com.huixiaoer.ant.api.service;

import com.huixiaoer.ant.api.model.bean.Student;
import com.huixiaoer.ant.api.model.bean.StudentExample;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.SelectKey;

import java.util.List;

public interface StudentService {
    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table student
     *
     * @mbg.generated Thu Oct 31 14:09:39 CST 2019
     */
    long countByExample(StudentExample example);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table student
     *
     * @mbg.generated Thu Oct 31 14:09:39 CST 2019
     */
    int deleteByExample(StudentExample example);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table student
     *
     * @mbg.generated Thu Oct 31 14:09:39 CST 2019
     */
    @Insert({
        "insert into student (id, user_name, ",
        "age, phone)",
        "values (#{id,jdbcType=VARCHAR}, #{userName,jdbcType=VARCHAR}, ",
        "#{age,jdbcType=INTEGER}, #{phone,jdbcType=VARCHAR})"
    })
    @SelectKey(statement="select uuid_short()", keyProperty="id", before=true, resultType=String.class)
    int insert(Student record);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table student
     *
     * @mbg.generated Thu Oct 31 14:09:39 CST 2019
     */
    int insertSelective(Student record);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table student
     *
     * @mbg.generated Thu Oct 31 14:09:39 CST 2019
     */
    List<Student> selectByExample(StudentExample example);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table student
     *
     * @mbg.generated Thu Oct 31 14:09:39 CST 2019
     */
    int updateByExampleSelective(@Param("record") Student record, @Param("example") StudentExample example);

    /**
     * This method was generated by MyBatis Generator.
     * This method corresponds to the database table student
     *
     * @mbg.generated Thu Oct 31 14:09:39 CST 2019
     */
    int updateByExample(@Param("record") Student record, @Param("example") StudentExample example);
}

StudentServiceImpl service interface implementation class, where the mybatis-plus wherein the mapper interface injection.

package com.huixiaoer.ant.api.service.impl;

import com.huixiaoer.ant.api.model.bean.Student;
import com.huixiaoer.ant.api.model.bean.StudentExample;
import com.huixiaoer.ant.api.repository.mysql.mapper.StudentMapper;
import com.huixiaoer.ant.api.repository.mysql.mapper.StudentPlusMapper;
import com.huixiaoer.ant.api.service.StudentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
@Slf4j
public class StudentServiceImpl implements StudentService {

    @Autowired
    private StudentMapper studentMapper;

    @Autowired
    private StudentPlusMapper studentPlusMapper;

    @Override
    public long countByExample(StudentExample example) {
        return 0;
    }

    @Override
    public int deleteByExample(StudentExample example) {
        return 0;
    }

    @Override
    public int insert(Student record) {
        return studentPlusMapper.insert(record);
    }

    @Override
    public int insertSelective(Student record) {
        return studentMapper.insertSelective(record);
    }

    @Override
    public List<Student> selectByExample(StudentExample example) {
        return null;
    }

    @Override
    public int updateByExampleSelective(Student record, StudentExample example) {
        return 0;
    }

    @Override
    public int updateByExample(Student record, StudentExample example) {
        return 0;
    }
}

SchoolController class that implements interactive front-end and back-end. Automatic injection students achieve business class.

package com.huixiaoer.ant.api.controller;

import com.huixiaoer.ant.api.common.constant.ResultCode;
import com.huixiaoer.ant.api.model.bean.Student;
import com.huixiaoer.ant.api.model.vi.StudentVI;
import com.huixiaoer.ant.api.service.impl.StudentServiceImpl;
import com.huixiaoer.ant.api.util.*;
import io.swagger.annotations.*;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.UUID;

/**
 * @author create by yiqiang.wu
 * @create 2019/06/12
 * @email [email protected]
 * @description 登录
 */
@Slf4j
@RestController
@Api(tags = "学校 相关接口")
public class SchoolController {

    @Autowired
    private StudentServiceImpl studentService;

    @Autowired
    private HttpServletRequest request;

    @ApiOperation(value = "增加学生信息")
    @PostMapping(value = "/insert/student")
    public CommonResult insertStudent(@RequestBody @ApiParam(name="学生对象",value="传入json格式",required=true) StudentVI studentVI) {
        try {
            Student student = new Student();
//            student.setId(UUID.randomUUID().toString());
            student.setUserName(studentVI.getUserName());
            student.setAge(studentVI.getAge());
            student.setPhone(studentVI.getPhone());
            studentService.insert(student);
        } catch (Exception e) {
            System.out.println(e);
            return CommonUtil.buildResponse(ResultCode.SYSTEM_ERROR, ResultCode.SYSTEM_ERROR_MSG);
        }
        return CommonUtil.buildResponse(ResultCode.SUCCESS, ResultCode.SUCCESS_MSG);
    }

}

Add Mybatis xml file

<?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.huixiaoer.ant.api.repository.mysql.mapper.StudentMapper">
  <resultMap id="BaseResultMap" type="com.huixiaoer.ant.api.model.bean.Student">
    <!--
      WARNING - @mbg.generated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Thu Oct 31 14:09:39 CST 2019.
    -->
    <constructor>
      <arg column="id" javaType="java.lang.String" jdbcType="VARCHAR" />
      <arg column="user_name" javaType="java.lang.String" jdbcType="VARCHAR" />
      <arg column="age" javaType="java.lang.Integer" jdbcType="INTEGER" />
      <arg column="phone" javaType="java.lang.String" jdbcType="VARCHAR" />
    </constructor>
  </resultMap>
  <sql id="Example_Where_Clause">
    <!--
      WARNING - @mbg.generated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Thu Oct 31 14:09:39 CST 2019.
    -->
    <where>
      <foreach collection="oredCriteria" item="criteria" separator="or">
        <if test="criteria.valid">
          <trim prefix="(" prefixOverrides="and" suffix=")">
            <foreach collection="criteria.criteria" item="criterion">
              <choose>
                <when test="criterion.noValue">
                  and ${criterion.condition}
                </when>
                <when test="criterion.singleValue">
                  and ${criterion.condition} #{criterion.value}
                </when>
                <when test="criterion.betweenValue">
                  and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
                </when>
                <when test="criterion.listValue">
                  and ${criterion.condition}
                  <foreach close=")" collection="criterion.value" item="listItem" open="(" separator=",">
                    #{listItem}
                  </foreach>
                </when>
              </choose>
            </foreach>
          </trim>
        </if>
      </foreach>
    </where>
  </sql>
  <sql id="Update_By_Example_Where_Clause">
    <!--
      WARNING - @mbg.generated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Thu Oct 31 14:09:39 CST 2019.
    -->
    <where>
      <foreach collection="example.oredCriteria" item="criteria" separator="or">
        <if test="criteria.valid">
          <trim prefix="(" prefixOverrides="and" suffix=")">
            <foreach collection="criteria.criteria" item="criterion">
              <choose>
                <when test="criterion.noValue">
                  and ${criterion.condition}
                </when>
                <when test="criterion.singleValue">
                  and ${criterion.condition} #{criterion.value}
                </when>
                <when test="criterion.betweenValue">
                  and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
                </when>
                <when test="criterion.listValue">
                  and ${criterion.condition}
                  <foreach close=")" collection="criterion.value" item="listItem" open="(" separator=",">
                    #{listItem}
                  </foreach>
                </when>
              </choose>
            </foreach>
          </trim>
        </if>
      </foreach>
    </where>
  </sql>
  <sql id="Base_Column_List">
    <!--
      WARNING - @mbg.generated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Thu Oct 31 14:09:39 CST 2019.
    -->
    id, user_name, age, phone
  </sql>
  <select id="selectByExample" parameterType="com.huixiaoer.ant.api.model.bean.StudentExample" resultMap="BaseResultMap">
    <!--
      WARNING - @mbg.generated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Thu Oct 31 14:09:39 CST 2019.
    -->
    select
    <if test="distinct">
      distinct
    </if>
    <include refid="Base_Column_List" />
    from student
    <if test="_parameter != null">
      <include refid="Example_Where_Clause" />
    </if>
    <if test="orderByClause != null">
      order by ${orderByClause}
    </if>
  </select>
  <delete id="deleteByExample" parameterType="com.huixiaoer.ant.api.model.bean.StudentExample">
    <!--
      WARNING - @mbg.generated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Thu Oct 31 14:09:39 CST 2019.
    -->
    delete from student
    <if test="_parameter != null">
      <include refid="Example_Where_Clause" />
    </if>
  </delete>
  <insert id="insertSelective" parameterType="com.huixiaoer.ant.api.model.bean.Student">
    <!--
      WARNING - @mbg.generated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Thu Oct 31 14:09:39 CST 2019.
    -->
    <selectKey keyProperty="id" order="BEFORE" resultType="java.lang.String">
      select uuid_short()
    </selectKey>
    insert into student
    <trim prefix="(" suffix=")" suffixOverrides=",">
      id,
      <if test="userName != null">
        user_name,
      </if>
      <if test="age != null">
        age,
      </if>
      <if test="phone != null">
        phone,
      </if>
    </trim>
    <trim prefix="values (" suffix=")" suffixOverrides=",">
      #{id,jdbcType=VARCHAR},
      <if test="userName != null">
        #{userName,jdbcType=VARCHAR},
      </if>
      <if test="age != null">
        #{age,jdbcType=INTEGER},
      </if>
      <if test="phone != null">
        #{phone,jdbcType=VARCHAR},
      </if>
    </trim>
  </insert>
  <select id="countByExample" parameterType="com.huixiaoer.ant.api.model.bean.StudentExample" resultType="java.lang.Long">
    <!--
      WARNING - @mbg.generated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Thu Oct 31 14:09:39 CST 2019.
    -->
    select count(*) from student
    <if test="_parameter != null">
      <include refid="Example_Where_Clause" />
    </if>
  </select>
  <update id="updateByExampleSelective" parameterType="map">
    <!--
      WARNING - @mbg.generated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Thu Oct 31 14:09:39 CST 2019.
    -->
    update student
    <set>
      <if test="record.id != null">
        id = #{record.id,jdbcType=VARCHAR},
      </if>
      <if test="record.userName != null">
        user_name = #{record.userName,jdbcType=VARCHAR},
      </if>
      <if test="record.age != null">
        age = #{record.age,jdbcType=INTEGER},
      </if>
      <if test="record.phone != null">
        phone = #{record.phone,jdbcType=VARCHAR},
      </if>
    </set>
    <if test="_parameter != null">
      <include refid="Update_By_Example_Where_Clause" />
    </if>
  </update>
  <update id="updateByExample" parameterType="map">
    <!--
      WARNING - @mbg.generated
      This element is automatically generated by MyBatis Generator, do not modify.
      This element was generated on Thu Oct 31 14:09:39 CST 2019.
    -->
    update student
    set id = #{record.id,jdbcType=VARCHAR},
      user_name = #{record.userName,jdbcType=VARCHAR},
      age = #{record.age,jdbcType=INTEGER},
      phone = #{record.phone,jdbcType=VARCHAR}
    <if test="_parameter != null">
      <include refid="Update_By_Example_Where_Clause" />
    </if>
  </update>
</mapper>

A variety of strategies to generate UUID generated UUID value.

Mybatis-Plus usage of BaseMapper

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