【java】【MyBatisPlus】【四】【完】MyBatisPlus一些实战总结（枚举、翻页、sql、组合条件、自增主键、逻辑删除）

组合条件、自增主键、逻辑删除）"/>

【java】【MyBatisPlus】【四】【完】MyBatisPlus一些实战总结（枚举、翻页、sql、组合条件、自增主键、逻辑删除）

目录

一、枚举

1、数据库type字段是Integer 类型枚举

2、创建一个该字段的枚举类 TypeEnum

 3、修改实体类

4、配置文件新增mybatis-plus的配置

5、检验：

5.1 查询显示

5.3 库里验证 

二、自增主键不是id字段处理

三、逻辑删除字段不是delete字段处理

1、实体加注解

2、yml配置文件新增配置

四、单表查询 

1、使用mybatis-plus自带的lambdaQueryWrapper条件进行查询

1.1 controller

1.2 servcie

1.3 serviceImpl

1.4 mapper

2、使用mybatis-plus自带的lambdaQueryWrapper条件进行+page进行分页查询

2.1 PageBean

2.2 controller

 2.3 service

2.4 servicrImpl

2.5 mapper

五、多表查询

1、使用sql语句进行多表查询

1.1 UserRoleDto接收返回数据

1.2 controller

1.3 service

1.4 servcieImpl

1.5 mapper

1.6 xml

2、翻页+组合条件查询

2.1 controller

2.2 service

2.3 serviceImpl

2.4 mapper

2.5 xml

六、事务处理

1、serviceImpl

2、yml配置事务日志

七、判重

1、数据库设置唯一判重

2、代码判重 

2.1 新增判重

2.2 修改判重

八、日期范围查询 

1、controller

2、service

3、serviceImpl

4、mapper

九、POST请求封装DTO查询

1、POST接口请求传参

 2、封装DTO

3、controller

4、service

5、serviceImpl

6、mapper

---

前言：项目实战过程当中，一些总结，例如枚举应用、翻页、单表、多表查询、翻页、自增主键、逻辑删除、判重等

一、枚举

1、数据库type字段是Integer 类型枚举

type字段 枚举用热类型：1-高温水；2-低温水；3-蒸汽；

2、创建一个该字段的枚举类 TypeEnum

package com.bocai.enums;import com.baomidou.mybatisplus.annotation.EnumValue;
import com.fasterxml.jackson.annotation.JsonValue;
import lombok.*;/*** a表的type字段 枚举用热类型：1-高温水；2-低温水；3-蒸汽；* 注意配置文件yml有配置*/
@AllArgsConstructor
@NoArgsConstructor
@Getter
public enum TypeEnum {HIGHTEMPERATUREWATER(1,"高温水"),LOWTEMPERATUREWATER(2,"低温水"),STEAM(3,"蒸汽");@EnumValue //将注解标注的数值存储到数据库中private  Integer hottype;@JsonValueprivate  String desc;}

上面2个注解很重要：@EnumValue //将注解标注的数值存储到数据库中

@JsonValue //在页面显示，不写这个就先森上面的枚举STEAM、LOWTEMPERATUREWATER、HIGHTEMPERATUREWATER

 3、修改实体类

package com.bocai.pojo;import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import java.io.Serializable;
import java.math.BigDecimal;
import java.time.LocalDateTime;import com.bocai.enums.TypeEnum;
import lombok.Data;/*** * @TableName inhousing*/
@TableName(value ="inhousing")
@Data
public class Inhousing implements Serializable {/*** */@TableId(type = IdType.AUTO)private Integer uniqueid;/*** 用热类型：1-高温水；2-低温水；3-蒸汽；*/private TypeEnum hottype;@TableField(exist = false)private static final long serialVersionUID = 1L;
}

4、配置文件新增mybatis-plus的配置

mybatis-plus:configuration:map-underscore-to-camel-case: true # 在映射实体或者属性时，将数据库中表名和字段名中的下划线去掉，按照驼峰命名法映射log-impl: org.apache.ibatis.logging.stdout.StdOutImpl  # ?????sqldefault-enum-type-handler: com.baomidou.mybatisplus.core.handlers.MybatisEnumTypeHandler  # 配置全局枚举处理器，好像还有说json的global-config:db-config:id-type: auto   # 数据库id生产规则全局 配置 # ASSIGN_ID雪花算法，数据库id建议使用Long类型logic-delete-field: deleted # 全局配置逻辑删除字段名logic-delete-value: 0 # 全局配置# 逻辑已删除值(默认为 1)这里因为我是反的所以改成0logic-not-delete-value: 1  # 逻辑未删除值(默认为 0）这里因为我是反的所以改成1# table-prefix: tbl_    # 数据库表前缀全局配置banner: false   # 关闭控制台mybatis-plus的logo
#  type-enums-package: com.bocai.enums   # 扫描通用枚举包 或者使用上面那个枚举全局配置

有两种方式：1、 default-enum-type-handler: com.baomidou.mybatisplus.core.handlers.MybatisEnumTypeHandler  # 配置全局枚举处理器，好像还有说json的

2、#  type-enums-package: com.bocai.enums   # 扫描通用枚举包 或者使用上面那个枚举全局配置

5、检验：

5.1 查询显示

5.3 库里验证 

二、自增主键不是id字段处理

@TableName(value ="user")
@Data
public class User implements Serializable {/*** 自增主键*/@TableId(type = IdType.AUTO)private Integer uniqueid;

三、逻辑删除字段不是delete字段处理

1、实体加注解

   /*** 0不启用 1启用*/@TableLogicprivate Boolean isenable;

2、yml配置文件新增配置

mybatis-plus:configuration:map-underscore-to-camel-case: true # 在映射实体或者属性时，将数据库中表名和字段名中的下划线去掉，按照驼峰命名法映射log-impl: org.apache.ibatis.logging.stdout.StdOutImpl  # ?????sqldefault-enum-type-handler: com.baomidou.mybatisplus.core.handlers.MybatisEnumTypeHandler  # 配置全局枚举处理器，好像还有说json的global-config:db-config:id-type: auto   # 数据库id生产规则全局 配置 # ASSIGN_ID雪花算法，数据库id建议使用Long类型logic-delete-field: deleted # 全局配置逻辑删除字段名logic-delete-value: 0 # 全局配置# 逻辑已删除值(默认为 1)这里因为我是反的所以改成0logic-not-delete-value: 1  # 逻辑未删除值(默认为 0）这里因为我是反的所以改成1# table-prefix: tbl_    # 数据库表前缀全局配置banner: false   # 关闭控制台mybatis-plus的logo
#  type-enums-package: com.bocai.enums   # 扫描通用枚举包 或者使用上面那个枚举全局配置

四、单表查询 

1、使用mybatis-plus自带的lambdaQueryWrapper条件进行查询

1.1 controller

package com.bocai.controller;import com.bocaimon.Result;import com.bocai.dto.UserRoleDto;
import com.bocai.pojo.PageBean;
import com.bocai.pojo.User;
import com.bocai.service.UserService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;import java.util.List;@RestController
@RequestMapping("/niubi")
@Slf4j
public class UserController {@Autowiredprivate UserService userService;/*** 查询全部用户--无翻页* @return*/@GetMappingpublic Result list(){log.info("查询全部启用用户信息！");List<User> list = userService.userList();return Result.success(list);}
}

1.2 servcie

package com.bocai.service;import com.bocai.dto.UserRoleDto;
import com.baomidou.mybatisplus.extension.service.IService;
import com.bocai.pojo.PageBean;
import com.bocai.pojo.User;import java.util.List;/**
* @author cheng
* @description 针对表【user】的数据库操作Service
* @createDate 2023-11-07 14:52:28
*/
public interface UserService extends IService<User> {/*** 查询全部启用用户 ==无翻页* @return*/List<User> userList();
}

1.3 serviceImpl

package com.bocai.service.impl;import com.aliyun.oss.ServiceException;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.bocai.dto.UserRoleDto;import com.bocai.mapper.UserRoleMapper;
import com.bocai.pojo.Emp;
import com.bocai.pojo.PageBean;
import com.bocai.pojo.Role;
import com.bocai.pojo.User;
import com.bocai.service.UserService;
import com.bocai.mapper.UserMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;import java.util.HashMap;
import java.util.List;
import java.util.Map;/**
* @author cheng
* @description 针对表【user】的数据库操作Service实现
* @createDate 2023-11-07 14:52:28
*/
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User>implements UserService{@Autowiredprivate UserMapper userMapper;@Autowiredprivate UserRoleMapper userRoleMapper;/*** 启用用户* @return*/@Overridepublic List<User> userList() {LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();lambdaQueryWrapper.select(User::getLoginname, User::getRealname, User::getIsenable);List<User> users = userMapper.selectList(lambdaQueryWrapper);return users;}

1.4 mapper

package com.bocai.mapper;import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.bocai.dto.UserRoleDto;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.bocai.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;import java.util.List;/**
* @author cheng
* @description 针对表【user】的数据库操作Mapper
* @createDate 2023-11-07 14:52:28
* @Entity com.bocai.pojo.User
*/
@Mapper
public interface UserMapper extends BaseMapper<User> {}

2、使用mybatis-plus自带的lambdaQueryWrapper条件进行+page进行分页查询

2.1 PageBean

package com.bocai.pojo;import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.util.List;/*** 分页查询结果封装类*/
@Data
@NoArgsConstructor
@AllArgsConstructor
public class PageBean {private Long total;//总记录数private List rows;//数据列表}

新增一个PageBean来装载返回数据

2.2 controller

package com.bocai.controller;import com.bocai.pojo.Emp;
import com.bocai.pojo.PageBean;
import com.bocaimon.Result;
import com.bocai.service.EmpService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.web.bind.annotation.*;import java.time.LocalDate;
import java.util.List;@RestController
@RequestMapping("/emps")
@Slf4j
public class EmpController {@Autowiredprivate EmpService empService;/*** 条件分页查询* @param page* @param pageSize* @param name* @param gender* @param begin* @param end* @return*/@GetMappingpublic Result page(@RequestParam(defaultValue = "1") Integer page,@RequestParam(defaultValue = "10") Integer pageSize,String name, Short gender,@DateTimeFormat(pattern = "yyyy-MM-dd") LocalDate begin,@DateTimeFormat(pattern = "yyyy-MM-dd") LocalDate end){log.info("分页查询参数：{}  {} {}  {}  {}  {}",page,pageSize,name,gender,begin,end);PageBean pageBean = empService.pageList(page,pageSize,name,gender,begin,end);return Result.success(pageBean);}
}

 2.3 service

package com.bocai.service;import com.bocai.pojo.Emp;
import com.baomidou.mybatisplus.extension.service.IService;
import com.bocai.pojo.PageBean;import java.time.LocalDate;
import java.util.List;/**
* @author cheng
* @description 针对表【emp(员工表)】的数据库操作Service
* @createDate 2023-10-31 10:44:06
*/
public interface EmpService extends IService<Emp> {/*** 分页查询* @param page* @param pageSize* @return*/PageBean pageList(Integer page, Integer pageSize, String name, Short gender, LocalDate begin, LocalDate end);
}

2.4 servicrImpl

package com.bocai.service.impl;import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.bocai.pojo.Emp;
import com.bocai.pojo.PageBean;
import com.bocai.service.EmpService;
import com.bocai.mapper.EmpMapper;
import com.bocai.utils.JwtUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import java.time.LocalDate;
import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.List;
import java.util.Map;/**
* @author cheng
* @description 针对表【emp(员工表)】的数据库操作Service实现
* @createDate 2023-10-31 10:44:06
*/
@Service
public class EmpServiceImpl extends ServiceImpl<EmpMapper, Emp>implements EmpService{@Autowiredprivate EmpMapper empMapper;/*** 分页查询* @param page* @param pageSize* @param name* @param gender* @param begin* @param end* @return*/@Overridepublic PageBean pageList(Integer page, Integer pageSize, String name, Short gender, LocalDate begin, LocalDate end) {LambdaQueryWrapper<Emp> lambdaQueryWrapper = new LambdaQueryWrapper<>();lambdaQueryWrapper.like(StringUtils.isNotBlank(name),Emp::getName,name).eq(gender != null,Emp::getGender,gender).ge(begin != null,Emp::getEntrydate,begin).le(end != null,Emp::getEntrydate,end);Page<Emp> pageEmp = new Page<>(page,pageSize);empMapper.selectPage(pageEmp,lambdaQueryWrapper);PageBean pageBean = new PageBean(pageEmp.getTotal(),pageEmp.getRecords());return pageBean;}
}

2.5 mapper

package com.bocai.mapper;import com.bocai.pojo.Emp;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import org.apache.ibatis.annotations.Mapper;/**
* @author cheng
* @description 针对表【emp(员工表)】的数据库操作Mapper
* @createDate 2023-10-31 10:44:06
* @Entity com.bocai.pojo.Emp
*/
@Mapper
public interface EmpMapper extends BaseMapper<Emp> {}

五、多表查询

1、使用sql语句进行多表查询

1.1 UserRoleDto接收返回数据

package com.bocai.dto;import com.bocai.pojo.User;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;@Data
@NoArgsConstructor
@AllArgsConstructor
public class UserRoleDto extends User {private String roleName;  //非user表字段
}

1.2 controller

package com.bocai.controller;import com.bocaimon.Result;import com.bocai.dto.UserRoleDto;
import com.bocai.pojo.PageBean;
import com.bocai.pojo.User;
import com.bocai.service.UserService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;import java.util.List;@RestController
@RequestMapping("/niubi")
@Slf4j
public class UserController {@Autowiredprivate UserService userService;/*** 查询全部用户--无翻页--- 使用sql以及指定显示字段* @return*/@GetMapping("/sql")public Result listSql(){log.info("查询全部启用用户信息显示+sql多表！");List<UserRoleDto> list = userService.userSqlList();return Result.success(list);}

1.3 service

package com.bocai.service;import com.bocai.dto.UserRoleDto;
import com.baomidou.mybatisplus.extension.service.IService;
import com.bocai.pojo.PageBean;
import com.bocai.pojo.User;import java.util.List;/**
* @author cheng
* @description 针对表【user】的数据库操作Service
* @createDate 2023-11-07 14:52:28
*/
public interface UserService extends IService<User> {/*** 查询全部用户无翻页--("查询全部启用用户信息显示+sql多表！");* @return*/List<UserRoleDto> userSqlList();
}

1.4 servcieImpl

package com.bocai.service.impl;import com.aliyun.oss.ServiceException;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.bocai.dto.UserRoleDto;import com.bocai.mapper.UserRoleMapper;
import com.bocai.pojo.Emp;
import com.bocai.pojo.PageBean;
import com.bocai.pojo.Role;
import com.bocai.pojo.User;
import com.bocai.service.UserService;
import com.bocai.mapper.UserMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;import java.util.HashMap;
import java.util.List;
import java.util.Map;/**
* @author cheng
* @description 针对表【user】的数据库操作Service实现
* @createDate 2023-11-07 14:52:28
*/
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User>implements UserService{@Autowiredprivate UserMapper userMapper;@Autowiredprivate UserRoleMapper userRoleMapper;/*** 查询全部用户无翻页--("查询全部启用用户信息显示+sql多表！");* @return*/@Overridepublic List<UserRoleDto> userSqlList() {List<UserRoleDto> UserRoleDto = userMapper.selectSqlList();return UserRoleDto;}
}

1.5 mapper

package com.bocai.mapper;import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.bocai.dto.UserRoleDto;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.bocai.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;import java.util.List;/**
* @author cheng
* @description 针对表【user】的数据库操作Mapper
* @createDate 2023-11-07 14:52:28
* @Entity com.bocai.pojo.User
*/
@Mapper
public interface UserMapper extends BaseMapper<User> {/*** 使用sql多表联查* @return*/List<UserRoleDto> selectSqlList();
}

1.6 xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapperPUBLIC "-//mybatis//DTD Mapper 3.0//EN"".dtd">
<mapper namespace="com.bocai.mapper.UserMapper"><resultMap id="BaseResultMap" type="com.bocai.pojo.User"><result property="uniqueid" column="uniqueId" jdbcType="INTEGER"/><result property="administrationcode" column="administrationCode" jdbcType="VARCHAR"/><result property="fixgroupid" column="fixGroupId" jdbcType="INTEGER"/><result property="loginname" column="loginName" jdbcType="VARCHAR"/><result property="password" column="password" jdbcType="CHAR"/><result property="realname" column="realName" jdbcType="VARCHAR"/>     <result property="isspecial" column="isSpecial" jdbcType="BIT"/><result property="isenable" column="isEnable" jdbcType="BIT"/></resultMap><sql id="Base_Column_List">uniqueId,loginName,password,realName,</sql><select id="selectSqlList" resultType="com.bocai.dto.UserRoleDto">SELECT a.`realName`,a.`loginName`,c.`name` as roleNameFROM USER aJOIN user_role b ON a.`uniqueId`=b.`userId`JOIN role c ON b.`roleId`=c.`uniqueId`WHERE a.`isEnable`='1';</select></mapper>

2、翻页+组合条件查询

2.1 controller

package com.bocai.controller;import com.bocaimon.Result;import com.bocai.dto.UserRoleDto;
import com.bocai.pojo.PageBean;
import com.bocai.pojo.User;
import com.bocai.service.UserService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;import java.util.List;@RestController
@RequestMapping("/niubi")
@Slf4j
public class UserController {@Autowiredprivate UserService userService;/***  使用sql多表查询分页，带条件*      * @param page 第几页*      * @param pageSize 每页条数*      * @param realName 真实姓名*      * @param userLevel 用户级别* @return*/@GetMapping("/sql/page")public Result listSqlPage(@RequestParam(defaultValue = "1") Integer page,@RequestParam(defaultValue = "10") Integer pageSize,String realName,Integer userLevel){log.info("查询全部启用用户信息显示+sql多表！翻页当前第{}页,每页{},姓名{}，用户级别{}",page,pageSize,realName,userLevel);PageBean pageBean = userService.userSqlPageList(page,pageSize,realName,userLevel);return Result.success(pageBean);}
}

2.2 service

package com.bocai.service;import com.bocai.dto.UserRoleDto;
import com.baomidou.mybatisplus.extension.service.IService;
import com.bocai.pojo.PageBean;
import com.bocai.pojo.User;import java.util.List;/**
* @author cheng
* @description 针对表【user】的数据库操作Service
* @createDate 2023-11-07 14:52:28
*/
public interface UserService extends IService<User> {/*** 多表联查+翻页+条件查询+sql* @param page* @param pageSize* @param realName* @param userLevel* @return*/PageBean userSqlPageList(Integer page, Integer pageSize,String realName,Integer userLevel);
}

2.3 serviceImpl

package com.bocai.service.impl;import com.aliyun.oss.ServiceException;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.bocai.dto.UserRoleDto;import com.bocai.mapper.UserRoleMapper;
import com.bocai.pojo.Emp;
import com.bocai.pojo.PageBean;
import com.bocai.pojo.Role;
import com.bocai.pojo.User;
import com.bocai.service.UserService;
import com.bocai.mapper.UserMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;import java.util.HashMap;
import java.util.List;
import java.util.Map;/**
* @author cheng
* @description 针对表【user】的数据库操作Service实现
* @createDate 2023-11-07 14:52:28
*/
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User>implements UserService{@Autowiredprivate UserMapper userMapper;@Autowiredprivate UserRoleMapper userRoleMapper;/*** 多表联查+翻页+条件查询+sql* @param page* @param pageSize* @param realName* @param userLevel* @return*/@Overridepublic PageBean userSqlPageList(Integer page, Integer pageSize,String realName,Integer userLevel) {Page<UserRoleDto> pageUserRole = new Page<>(page,pageSize);userMapper.selectUserRoleDtoPage(pageUserRole,realName,userLevel);pageUserRole.getRecords();log.info("sss{},{},{},{},{}",pageUserRole.getTotal());PageBean pageBean = new PageBean(pageUserRole.getTotal(),pageUserRole.getRecords());return pageBean;}}

2.4 mapper

package com.bocai.mapper;import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.bocai.dto.UserRoleDto;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.bocai.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;import java.util.List;/**
* @author cheng
* @description 针对表【user】的数据库操作Mapper
* @createDate 2023-11-07 14:52:28
* @Entity com.bocai.pojo.User
*/
@Mapper
public interface UserMapper extends BaseMapper<User> {/*** 多表联查+翻页+条件查询+sql* @param pageUserRole* @param realName* @param userLevel* @return*/Page<UserRoleDto>selectUserRoleDtoPage(Page<UserRoleDto> pageUserRole, String realName,Integer userLevel);}

2.5 xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapperPUBLIC "-//mybatis//DTD Mapper 3.0//EN"".dtd">
<mapper namespace="com.bocai.mapper.UserMapper"><resultMap id="BaseResultMap" type="com.bocai.pojo.User"><result property="uniqueid" column="uniqueId" jdbcType="INTEGER"/><result property="administrationcode" column="administrationCode" jdbcType="VARCHAR"/><result property="fixgroupid" column="fixGroupId" jdbcType="INTEGER"/><result property="loginname" column="loginName" jdbcType="VARCHAR"/><result property="password" column="password" jdbcType="CHAR"/><result property="realname" column="realName" jdbcType="VARCHAR"/>     <result property="isspecial" column="isSpecial" jdbcType="BIT"/><result property="isenable" column="isEnable" jdbcType="BIT"/></resultMap><sql id="Base_Column_List">uniqueId,loginName,password,realName,</sql><select id="selectUserRoleDtoPage" resultType="com.bocai.dto.UserRoleDto">SELECT a.uniqueid,a.`realName`,a.`loginName`,c.`name` as roleNameFROM USER aJOIN user_role b ON a.`uniqueId`=b.`userId`JOIN role c ON b.`roleId`=c.`uniqueId`<where>a.`isEnable`='1'<if test="realName != null">and   a.realName like concat('%', #{realName}, '%')</if><if test="userLevel != null">and a.userLevel=#{userLevel}</if></where></select></mapper>

六、事务处理

1、serviceImpl

    @Override@Transactionalpublic void deleteById(Integer id) {userMapper.deleteById(id);
//        int i = 1/0;userMapper.updateUserById(id);Map<String, Object> map = new HashMap<>();map.put("userid",id);userRoleMapper.deleteByMap(map); //根据用户id删除用户与角色关系}

2、yml配置事务日志

#spring事务管理日志
logging:level:org.springframework.jdbc.support.JdbcTransactionManager: debug

七、判重

1、数据库设置唯一判重

2、代码判重 

2.1 新增判重

/*** 新增角色* @param role*/@Overridepublic void addRole(Role role) {LambdaQueryWrapper<Role> lambdaQueryWrapper = new LambdaQueryWrapper<>();lambdaQueryWrapper.eq(role.getName() != null,Role::getName, role.getName());long count = roleMapper.selectCount(lambdaQueryWrapper);if (count > 0) {throw new ServiceException("该角色名已存在！");}role.setUpdatetime(LocalDateTime.now());role.setAdduserid(2);roleMapper.insert(role);}

2.2 修改判重

    /*** 修改角色* @param role*/@Overridepublic void alterUser(Role role) {LambdaQueryWrapper<Role> lambdaQueryWrapper = new LambdaQueryWrapper<>();lambdaQueryWrapper.eq(role.getName() != null,Role::getName, role.getName()).ne(role.getUniqueid() != null, Role::getUniqueid,role.getUniqueid());long count = roleMapper.selectCount(lambdaQueryWrapper);if (count > 0) {throw new ServiceException("该角色名已存在！");}role.setUpdatetime(LocalDateTime.now());roleMapper.updateById(role);}

注意这里有个自己跟自己判重的逻辑，使用了ne的方式

八、日期范围查询 

1、controller

package com.bocai.controller;import com.bocaimon.Result;
import com.bocai.pojo.PageBean;
import com.bocai.pojo.Role;
import com.bocai.service.RoleService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.web.bind.annotation.*;import java.time.LocalDate;
import java.time.LocalDateTime;@RestController
@RequestMapping("roles")
@Slf4j
public class RoleController {@Autowiredprivate RoleService roleService;/*** 带条件、翻页的查询全部角色* @param page 当前第几页* @param pageSize 每页多少条* @param name 角色名* @param roleType 角色类型* @param begin 开始时间* @param end 结束时间* @return*/@GetMappingpublic Result page(@RequestParam(defaultValue = "1") Integer page,@RequestParam(defaultValue = "10") Integer pageSize,@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss") LocalDateTime begin,@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss") LocalDateTime end,String name,String roleType){log.info("带翻页和条件的查询全部角色当前第{}页,每页{}条,角色名：{},角色类型：{},开始时间{}，结束时间{}",page,pageSize,name,roleType,begin,end);PageBean pageBean = roleService.rolePage(page,pageSize,name,roleType,begin,end);return Result.success(pageBean);}
}

2、service

package com.bocai.service;import com.baomidou.mybatisplus.extension.service.IService;
import com.bocai.pojo.PageBean;
import com.bocai.pojo.Role;import java.time.LocalDateTime;/**
* @author cheng
* @description 针对表【role】的数据库操作Service
* @createDate 2023-11-07 14:52:38
*/
public interface RoleService extends IService<Role> {/*** 带条件、翻页的查询全部角色* @param page 当前第几页* @param pageSize 每页多少条* @param name 角色名* @param roleType 角色类型* @param begin 开始时间* @param end 结束时间* @return*/PageBean rolePage(Integer page, Integer pageSize, String name, String roleType, LocalDateTime begin,LocalDateTime end);
}

3、serviceImpl

package com.bocai.service.impl;import com.aliyun.oss.ServiceException;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.bocai.mapper.UserRoleMapper;
import com.bocai.pojo.Inhousing;
import com.bocai.pojo.PageBean;
import com.bocai.pojo.Role;import com.bocai.service.RoleService;
import com.bocai.mapper.RoleMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;/**
* @author cheng
* @description 针对表【role】的数据库操作Service实现
* @createDate 2023-11-07 14:52:38
*/
@Service
public class RoleServiceImpl extends ServiceImpl<RoleMapper, Role>implements RoleService{@Autowiredprivate RoleMapper roleMapper;@Autowiredprivate UserRoleMapper userRoleMapper;/*** 带条件的翻页查询全部角色* @param page 当前第几页* @param pageSize 每页多少条* @param name 角色名* @param roleType 角色类型* @param begin 开始时间* @param end 结束时间* @return*/@Overridepublic PageBean rolePage(Integer page, Integer pageSize, String name, String roleType,LocalDateTime begin,LocalDateTime end) {LambdaQueryWrapper<Role> lambdaQueryWrapper =new LambdaQueryWrapper<>();lambdaQueryWrapper.like(StringUtils.isNotBlank(name),Role::getName,name).like(StringUtils.isNotBlank(roleType),Role::getRoletype,roleType).between(begin != null && end != null,Role::getUpdatetime,begin,end);Page<Role> rolePage = new Page<>(page,pageSize);roleMapper.selectPage(rolePage,lambdaQueryWrapper);PageBean pageBean = new PageBean(rolePage.getTotal(),rolePage.getRecords());return pageBean;}

也可以使用这个方式

.ge(begin != null,Role::getRoletype,begin)
.le(end != null,Role::getRoletype,end);

 

4、mapper

package com.bocai.mapper;import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.bocai.pojo.Role;
import org.apache.ibatis.annotations.Mapper;/**
* @author cheng
* @description 针对表【role】的数据库操作Mapper
* @createDate 2023-11-07 14:52:38
* @Entity com.bocai.pojo.Role
*/
@Mapper
public interface RoleMapper extends BaseMapper<Role> {}

九、POST请求封装DTO查询

1、POST接口请求传参

{"roleid": 564,"usersid": [694, 693]
}

 2、封装DTO

package com.bocai.dto;import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;import java.util.List;@Data
@NoArgsConstructor
@AllArgsConstructor
public class UsersRoleDto{private Integer roleid;private List<Integer> usersid;
}

3、controller

package com.bocai.controller;import com.bocaimon.Result;
import com.bocai.dto.UsersRoleDto;
import com.bocai.service.UserRoleService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;import java.util.List;@RestController
@RequestMapping("/userRoles")
@Slf4j
public class userRoleController {@Autowiredprivate UserRoleService userRoleService;/*** 分配* @param usersRoleDto* @return*/@PostMapping()public Result usersRole(@RequestBody UsersRoleDto usersRoleDto){log.info("分配{}",usersRoleDto);userRoleService.usersRole(usersRoleDto);return  Result.success();}
}

4、service

package com.bocai.service;import com.baomidou.mybatisplus.extension.service.IService;
import com.bocai.dto.UsersRoleDto;
import com.bocai.pojo.UserRole;import java.util.List;/**
* @author cheng
* @description 针对表【user_role】的数据库操作Service
* @createDate 2023-11-07 14:52:46
*/
public interface UserRoleService extends IService<UserRole> {/*** 分配* @param usersRoleDto*/void usersRole(UsersRoleDto usersRoleDto);}

5、serviceImpl

package com.bocai.service.impl;import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.bocai.dto.UsersRoleDto;
import com.bocai.pojo.UserRole;
import com.bocai.service.UserRoleService;
import com.bocai.mapper.UserRoleMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import java.util.List;/**
* @author cheng
* @description 针对表【user_role】的数据库操作Service实现
* @createDate 2023-11-07 14:52:46
*/
@Service
@Slf4j
public class UserRoleServiceImpl extends ServiceImpl<UserRoleMapper, UserRole>implements UserRoleService{@Autowiredprivate UserRoleMapper userRoleMapper;/*** 分配* @param usersRoleDto*/@Overridepublic void usersRole(UsersRoleDto usersRoleDto) {usersRoleDto.getUsersid().forEach(userId ->{UserRole userRole = new UserRole();userRole.setUserid(userId);userRole.setRoleid(usersRoleDto.getRoleid());LambdaQueryWrapper<UserRole> lambdaQueryWrapper = new LambdaQueryWrapper<>();lambdaQueryWrapper.eq(userId != null,UserRole::getUserid,userId);Integer count = userRoleMapper.selectCount(lambdaQueryWrapper);if (count > 0){userRoleMapper.delete(lambdaQueryWrapper);}userRoleMapper.insert(userRole);});}}

这里做了一个查询处理，针对存在的对象，先查询出来删除，再新增 

6、mapper

package com.bocai.mapper;import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.bocai.pojo.UserRole;
import org.apache.ibatis.annotations.Mapper;/**
* @author cheng
* @description 针对表【user_role】的数据库操作Mapper
* @createDate 2023-11-07 14:52:46
* @Entity com.bocai.pojo.UserRole
*/
@Mapper
public interface UserRoleMapper extends BaseMapper<UserRole> {}