Mybatis-Plus BaseMapper的用法详解

2023-07-17 21:47:03 313

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

packagecom.huixiaoer.ant.api.model.bean;

importcom.baomidou.mybatisplus.annotation.IdType;
importcom.baomidou.mybatisplus.annotation.TableId;

publicclassStudent{
/**
*
*ThisfieldwasgeneratedbyMyBatisGenerator.
*Thisfieldcorrespondstothedatabasecolumnstudent.id
*
*@mbg.generatedThuOct3114:09:39CST2019
*/
@TableId(type=IdType.UUID)
privateStringid;

/**
*
*ThisfieldwasgeneratedbyMyBatisGenerator.
*Thisfieldcorrespondstothedatabasecolumnstudent.user_name
*
*@mbg.generatedThuOct3114:09:39CST2019
*/
privateStringuserName;

/**
*
*ThisfieldwasgeneratedbyMyBatisGenerator.
*Thisfieldcorrespondstothedatabasecolumnstudent.age
*
*@mbg.generatedThuOct3114:09:39CST2019
*/
privateIntegerage;

/**
*
*ThisfieldwasgeneratedbyMyBatisGenerator.
*Thisfieldcorrespondstothedatabasecolumnstudent.phone
*
*@mbg.generatedThuOct3114:09:39CST2019
*/
privateStringphone;

/**
*ThismethodwasgeneratedbyMyBatisGenerator.
*Thismethodcorrespondstothedatabasetablestudent
*
*@mbg.generatedThuOct3114:09:39CST2019
*/
publicStudent(Stringid,StringuserName,Integerage,Stringphone){
this.id=id;
this.userName=userName;
this.age=age;
this.phone=phone;
}

/**
*ThismethodwasgeneratedbyMyBatisGenerator.
*Thismethodcorrespondstothedatabasetablestudent
*
*@mbg.generatedThuOct3114:09:39CST2019
*/
publicStudent(){
super();
}

/**
*ThismethodwasgeneratedbyMyBatisGenerator.
*Thismethodreturnsthevalueofthedatabasecolumnstudent.id
*
*@returnthevalueofstudent.id
*
*@mbg.generatedThuOct3114:09:39CST2019
*/
publicStringgetId(){
returnid;
}

/**
*ThismethodwasgeneratedbyMyBatisGenerator.
*Thismethodsetsthevalueofthedatabasecolumnstudent.id
*
*@paramidthevalueforstudent.id
*
*@mbg.generatedThuOct3114:09:39CST2019
*/
publicvoidsetId(Stringid){
this.id=id==null?null:id.trim();
}

/**
*ThismethodwasgeneratedbyMyBatisGenerator.
*Thismethodreturnsthevalueofthedatabasecolumnstudent.user_name
*
*@returnthevalueofstudent.user_name
*
*@mbg.generatedThuOct3114:09:39CST2019
*/
publicStringgetUserName(){
returnuserName;
}

/**
*ThismethodwasgeneratedbyMyBatisGenerator.
*Thismethodsetsthevalueofthedatabasecolumnstudent.user_name
*
*@paramuserNamethevalueforstudent.user_name
*
*@mbg.generatedThuOct3114:09:39CST2019
*/
publicvoidsetUserName(StringuserName){
this.userName=userName==null?null:userName.trim();
}

/**
*ThismethodwasgeneratedbyMyBatisGenerator.
*Thismethodreturnsthevalueofthedatabasecolumnstudent.age
*
*@returnthevalueofstudent.age
*
*@mbg.generatedThuOct3114:09:39CST2019
*/
publicIntegergetAge(){
returnage;
}

/**
*ThismethodwasgeneratedbyMyBatisGenerator.
*Thismethodsetsthevalueofthedatabasecolumnstudent.age
*
*@paramagethevalueforstudent.age
*
*@mbg.generatedThuOct3114:09:39CST2019
*/
publicvoidsetAge(Integerage){
this.age=age;
}

/**
*ThismethodwasgeneratedbyMyBatisGenerator.
*Thismethodreturnsthevalueofthedatabasecolumnstudent.phone
*
*@returnthevalueofstudent.phone
*
*@mbg.generatedThuOct3114:09:39CST2019
*/
publicStringgetPhone(){
returnphone;
}

/**
*ThismethodwasgeneratedbyMyBatisGenerator.
*Thismethodsetsthevalueofthedatabasecolumnstudent.phone
*
*@paramphonethevalueforstudent.phone
*
*@mbg.generatedThuOct3114:09:39CST2019
*/
publicvoidsetPhone(Stringphone){
this.phone=phone==null?null:phone.trim();
}
}

StudnetVI实体类，用户从页面接收参数

packagecom.huixiaoer.ant.api.model.vi;

importio.swagger.annotations.ApiModel;
importio.swagger.annotations.ApiModelProperty;

@ApiModel(value="student对象",description="学生对象student")
publicclassStudentVI{


/**
*
*ThisfieldwasgeneratedbyMyBatisGenerator.
*Thisfieldcorrespondstothedatabasecolumnstudent.user_name
*
*@mbg.generatedThuOct3114:09:39CST2019
*/
@ApiModelProperty(value="学生姓名",name="userName",required=true)
privateStringuserName;

/**
*
*ThisfieldwasgeneratedbyMyBatisGenerator.
*Thisfieldcorrespondstothedatabasecolumnstudent.age
*
*@mbg.generatedThuOct3114:09:39CST2019
*/
@ApiModelProperty(value="年龄",name="age",required=true)
privateIntegerage;

/**
*
*ThisfieldwasgeneratedbyMyBatisGenerator.
*Thisfieldcorrespondstothedatabasecolumnstudent.phone
*
*@mbg.generatedThuOct3114:09:39CST2019
*/
@ApiModelProperty(value="手机号",name="phone",required=true)
privateStringphone;


publicStringgetUserName(){
returnuserName;
}

publicvoidsetUserName(StringuserName){
this.userName=userName;
}

publicIntegergetAge(){
returnage;
}

publicvoidsetAge(Integerage){
this.age=age;
}

publicStringgetPhone(){
returnphone;
}

publicvoidsetPhone(Stringphone){
this.phone=phone;
}

}

StudentPlusMapper接口类，实现BaseMapper用来实现Mybatis-Plus的增强功能。

packagecom.huixiaoer.ant.api.repository.mysql.mapper;

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

publicinterfaceStudentPlusMapperextendsBaseMapper{
//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

packagecom.huixiaoer.ant.api.service;

importcom.huixiaoer.ant.api.model.bean.Student;
importcom.huixiaoer.ant.api.model.bean.StudentExample;
importorg.apache.ibatis.annotations.Insert;
importorg.apache.ibatis.annotations.Param;
importorg.apache.ibatis.annotations.SelectKey;

importjava.util.List;

publicinterfaceStudentService{
/**
*ThismethodwasgeneratedbyMyBatisGenerator.
*Thismethodcorrespondstothedatabasetablestudent
*
*@mbg.generatedThuOct3114:09:39CST2019
*/
longcountByExample(StudentExampleexample);

/**
*ThismethodwasgeneratedbyMyBatisGenerator.
*Thismethodcorrespondstothedatabasetablestudent
*
*@mbg.generatedThuOct3114:09:39CST2019
*/
intdeleteByExample(StudentExampleexample);

/**
*ThismethodwasgeneratedbyMyBatisGenerator.
*Thismethodcorrespondstothedatabasetablestudent
*
*@mbg.generatedThuOct3114:09:39CST2019
*/
@Insert({
"insertintostudent(id,user_name,",
"age,phone)",
"values(#{id,jdbcType=VARCHAR},#{userName,jdbcType=VARCHAR},",
"#{age,jdbcType=INTEGER},#{phone,jdbcType=VARCHAR})"
})
@SelectKey(statement="selectuuid_short()",keyProperty="id",before=true,resultType=String.class)
intinsert(Studentrecord);

/**
*ThismethodwasgeneratedbyMyBatisGenerator.
*Thismethodcorrespondstothedatabasetablestudent
*
*@mbg.generatedThuOct3114:09:39CST2019
*/
intinsertSelective(Studentrecord);

/**
*ThismethodwasgeneratedbyMyBatisGenerator.
*Thismethodcorrespondstothedatabasetablestudent
*
*@mbg.generatedThuOct3114:09:39CST2019
*/
ListselectByExample(StudentExampleexample);

/**
*ThismethodwasgeneratedbyMyBatisGenerator.
*Thismethodcorrespondstothedatabasetablestudent
*
*@mbg.generatedThuOct3114:09:39CST2019
*/
intupdateByExampleSelective(@Param("record")Studentrecord,@Param("example")StudentExampleexample);

/**
*ThismethodwasgeneratedbyMyBatisGenerator.
*Thismethodcorrespondstothedatabasetablestudent
*
*@mbg.generatedThuOct3114:09:39CST2019
*/
intupdateByExample(@Param("record")Studentrecord,@Param("example")StudentExampleexample);
}

StudentServiceImpl业务接口实现类，这里将mybatis-plus的mapper接口注入其中。

packagecom.huixiaoer.ant.api.service.impl;

importcom.huixiaoer.ant.api.model.bean.Student;
importcom.huixiaoer.ant.api.model.bean.StudentExample;
importcom.huixiaoer.ant.api.repository.mysql.mapper.StudentMapper;
importcom.huixiaoer.ant.api.repository.mysql.mapper.StudentPlusMapper;
importcom.huixiaoer.ant.api.service.StudentService;
importlombok.extern.slf4j.Slf4j;
importorg.springframework.beans.factory.annotation.Autowired;
importorg.springframework.stereotype.Service;

importjava.util.List;

@Service
@Slf4j
publicclassStudentServiceImplimplementsStudentService{

@Autowired
privateStudentMapperstudentMapper;

@Autowired
privateStudentPlusMapperstudentPlusMapper;

@Override
publiclongcountByExample(StudentExampleexample){
return0;
}

@Override
publicintdeleteByExample(StudentExampleexample){
return0;
}

@Override
publicintinsert(Studentrecord){
returnstudentPlusMapper.insert(record);
}

@Override
publicintinsertSelective(Studentrecord){
returnstudentMapper.insertSelective(record);
}

@Override
publicListselectByExample(StudentExampleexample){
returnnull;
}

@Override
publicintupdateByExampleSelective(Studentrecord,StudentExampleexample){
return0;
}

@Override
publicintupdateByExample(Studentrecord,StudentExampleexample){
return0;
}
}

SchoolController类，实现前端和后台的交互。自动注入学生业务实现类。

packagecom.huixiaoer.ant.api.controller;

importcom.huixiaoer.ant.api.common.constant.ResultCode;
importcom.huixiaoer.ant.api.model.bean.Student;
importcom.huixiaoer.ant.api.model.vi.StudentVI;
importcom.huixiaoer.ant.api.service.impl.StudentServiceImpl;
importcom.huixiaoer.ant.api.util.*;
importio.swagger.annotations.*;
importlombok.extern.slf4j.Slf4j;
importorg.springframework.beans.factory.annotation.Autowired;
importorg.springframework.web.bind.annotation.*;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
importjava.util.UUID;

/**
*@authorcreatebyyiqiang.wu
*@create2019/06/12
*@emailyiqiang.wu@huixiaoer.com
*@description登录
*/
@Slf4j
@RestController
@Api(tags="学校相关接口")
publicclassSchoolController{

@Autowired
privateStudentServiceImplstudentService;

@Autowired
privateHttpServletRequestrequest;

@ApiOperation(value="增加学生信息")
@PostMapping(value="/insert/student")
publicCommonResultinsertStudent(@RequestBody@ApiParam(name="学生对象",value="传入json格式",required=true)StudentVIstudentVI){
try{
Studentstudent=newStudent();
//student.setId(UUID.randomUUID().toString());
student.setUserName(studentVI.getUserName());
student.setAge(studentVI.getAge());
student.setPhone(studentVI.getPhone());
studentService.insert(student);
}catch(Exceptione){
System.out.println(e);
returnCommonUtil.buildResponse(ResultCode.SYSTEM_ERROR,ResultCode.SYSTEM_ERROR_MSG);
}
returnCommonUtil.buildResponse(ResultCode.SUCCESS,ResultCode.SUCCESS_MSG);
}

}

补充一下Mybatis的xml文件






















and${criterion.condition}


and${criterion.condition}#{criterion.value}


and${criterion.condition}#{criterion.value}and#{criterion.secondValue}


and${criterion.condition}

#{listItem}


















and${criterion.condition}


and${criterion.condition}#{criterion.value}


and${criterion.condition}#{criterion.value}and#{criterion.secondValue}


and${criterion.condition}

#{listItem}











id,user_name,age,phone



select

distinct


fromstudent




orderby${orderByClause}




deletefromstudent







selectuuid_short()

insertintostudent

id,

user_name,


age,


phone,



#{id,jdbcType=VARCHAR},

#{userName,jdbcType=VARCHAR},


#{age,jdbcType=INTEGER},


#{phone,jdbcType=VARCHAR},





selectcount(*)fromstudent






updatestudent


id=#{record.id,jdbcType=VARCHAR},


user_name=#{record.userName,jdbcType=VARCHAR},


age=#{record.age,jdbcType=INTEGER},


phone=#{record.phone,jdbcType=VARCHAR},








updatestudent
setid=#{record.id,jdbcType=VARCHAR},
user_name=#{record.userName,jdbcType=VARCHAR},
age=#{record.age,jdbcType=INTEGER},
phone=#{record.phone,jdbcType=VARCHAR}

各种UUID生成策略，生成的UUID值进行比较。

到此这篇关于Mybatis-PlusBaseMapper的用法详解的文章就介绍到这了,更多相关Mybatis-PlusBaseMapper内容请搜索毛票票以前的文章或继续浏览下面的相关文章希望大家以后多多支持毛票票！

声明：本文内容来源于网络，版权归原作者所有，内容由互联网用户自发贡献自行上传，本网站不拥有所有权，未作人工编辑处理，也不承担相关法律责任。如果您发现有涉嫌版权的内容，欢迎发送邮件至：czq8825#qq.com（发邮件时，请将#更换为@）进行举报，并提供相关证据，一经查实，本站将立刻删除涉嫌侵权内容。

Mybatis-Plus BaseMapper的用法详解

热门推荐

随机推荐