Mybatis-Plus的BaseMapper的用法
1、如何使用BaseMapper进行数据库的操作。
2、使用BaseMapper进行插入实体时如何让UUID的主键自动生成。
Student实体类,其中id属性主键为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实体类,用户从页面接收参数
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接口类,实现BaseMapper用来实现Mybatis-Plus的增强功能。
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 extends BaseMapper<Student> {
//不需要实现,这时候就可以调用baseMapper的增删改查了
}
StudentService业务接口类
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业务接口实现类,这里将mybatis-plus的mapper接口注入其中。
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类,实现前端和后台的交互。自动注入学生业务实现类。
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 yiqiang.wu@huixiaoer.com
* @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);
} }
补充一下Mybatis的xml文件
<?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>
各种UUID生成策略,生成的UUID值进行比较。
Mybatis-Plus的BaseMapper的用法的更多相关文章
- 9.mybatis动态SQL标签的用法
mybatis动态SQL标签的用法 动态 SQL MyBatis 的强大特性之一便是它的动态 SQL.如果你有使用 JDBC 或其他类似框架的经验,你就能体会到根据不同条件拼接 SQL 语句有多么 ...
- MyBatis从入门到精通(2):MyBatis XML方式的基本用法
本章将通过完成权限管理的常见业务来学习 MyBatis XML方式的基本用法 2.1一个简单的权限控制需求 权限管理的需求: 一个用户拥有若干角色,一个角色拥有若干权限,权限就是对某个模块资源的某种操 ...
- MyBatis #{} 和 ${} 引用值的用法
1.#{} 引用值的用法 UserMapper配置文件: <select id="queryOne" resultType="cn.tedu.mybatis.bea ...
- MyBatis从入门到精通(二):MyBatis XML方式的基本用法之Select
最近在读刘增辉老师所著的<MyBatis从入门到精通>一书,很有收获,于是将自己学习的过程以博客形式输出,如有错误,欢迎指正,如帮助到你,不胜荣幸! 1. 明确需求 书中提到的需求是一个基 ...
- MyBatis从入门到精通(三):MyBatis XML方式的基本用法之多表查询
最近在读刘增辉老师所著的<MyBatis从入门到精通>一书,很有收获,于是将自己学习的过程以博客形式输出,如有错误,欢迎指正,如帮助到你,不胜荣幸! 1. 多表查询 上篇博客中,我们示例的 ...
- MyBatis从入门到精通(四):MyBatis XML方式的基本用法之增删改
最近在读刘增辉老师所著的<MyBatis从入门到精通>一书,很有收获,于是将自己学习的过程以博客形式输出,如有错误,欢迎指正,如帮助到你,不胜荣幸! 1. insert用法 1.1 简单的 ...
- MyBatis:choose标签的用法
<!-- 4.2 choose用法 需求: 在已有的sys_user表中,除了主键id外,我们认为user_name也是唯一的, 所有的用户名都不可以重复.现在进行如下查询:当参数id有值的时候 ...
- MyBatis中foreach循环的用法
一.在了解foreach之前,先了解一下mybatis传入参数及parameterType 1.我们在Dao层向对应的mapper.xml文件传递参数时,可以传递的参数有: ①.基本数据类型(如int ...
- MyBatis从入门到精通(第2章):MyBatis XML方式的基本用法【insert用法、update用法、delete用法】
2.4 insert 用法 2.4.1 简单的 insert方法 在接口 UserMapper.java 中添加如下方法. /** * 新增用户 * @param sysUser * @retur ...
随机推荐
- 通达信金融终端_尘缘整合_V7.12
http://pan.baidu.com/s/1gvtPO http://pan.baidu.com/s/1xqrk6 通达信金融终端_尘缘整合_V7.12
- mysql的授权命令
#查看用户select user,host from mysql.user; (root,%),表示可以远程登录,并且是除服务器外的其他任何终端, 如CREATE USER 'azkaban'@'19 ...
- PTA(Basic Level)1026.程序运行时间
要获得一个 C 语言程序的运行时间,常用的方法是调用头文件 time.h,其中提供了 clock() 函数,可以捕捉从程序开始运行到 clock() 被调用时所耗费的时间.这个时间单位是 clock ...
- Java中的异常处理try catch(第八周课堂示例总结)
异常处理 使用Java异常处理机制: 把可能会发生错误的代码放进try语句块中. 当程序检测到出现了一个错误时会抛出一个异常对象. 异常处理代码会捕获并处理这个错误. catch语句块中的代码用于处理 ...
- JAVA基础:Java中equals和==的区别
java中的数据类型,可分为两类: 1.基本数据类型,也称原始数据类型.byte,short,char,int,long,float,double,boolean 他们之间的比较,应用双等号( ...
- Ruby学习中(首探数组, 注释, 运算符, 三元表达式, 字符串)
一. 数组 1.定义一个数组 games = ["英雄联盟", "绝地求生", "钢铁雄心"] puts games 2.数组的循环 gam ...
- 移动端、pc端通用点击复制
点击复制 function copyArticle(event){ const range = document.createRange(); range.selectNode(document.ge ...
- python多进程,并获取每个进程的返回值
pool = multiprocessing.Pool(processes=10) row = [...] for row in rows: task_id = row[1] img_id = row ...
- Codeforces 1196E. Connected Component on a Chessboard
传送门 注意到棋盘可以看成无限大的,那么只要考虑如何构造一个尽可能合法的情况 不妨假设需要的白色格子比黑色格子少 那么容易发现最好的情况之一就是白色排一排然后中间黑的先连起来,剩下黑色的再全部填白色周 ...
- 使用curl访问https
在Linux中curl是一个利用URL规则在命令行下工作的文件传输工具,可以说是一款很强大的http命令行工具.它支持文件的上传和下载,是综合传输工具,但按传统,习惯称url为下载工具.然而在使用cr ...