springboot整合mybatis-plus
Mybatis-Plus（简称MP）是一个 Mybatis 的增强工具，在 Mybatis 的基础上只做增强不做改变，为简化开发、提高效率而生。
特性：
-
无侵入：只做增强不做改变，引入它不会对现有工程产生影响，如丝般顺滑
-
损耗小：启动即会自动注入基本 CURD，性能基本无损耗，直接面向对象操作
-
强大的 CRUD 操作：内置通用 Mapper、通用 Service，仅仅通过少量配置即可实现单表大部分 CRUD 操作，更有强大的条件构造器，满足各类使用需求
-
支持主键自动生成：支持多达 4 种主键策略（内含分布式唯一 ID 生成器 - Sequence），可自由配置，完美解决主键问题
-
内置代码生成器：采用代码或者 Maven 插件可快速生成 Mapper 、 Model 、 Service 、 Controller 层代码，支持模板引擎，更有超多自定义配置等您来使用
-
内置分页插件：基于 MyBatis 物理分页，开发者无需关心具体操作，配置好插件之后，写分页等同于普通 List 查询
-
分页插件支持多种数据库：支持 MySQL、MariaDB、Oracle、DB2、H2、HSQL、SQLite、Postgre、SQLServer 等多种数据库
1.环境搭建
1 配置druid.datasource数据源，获取数据库连接
pom.xml导入依赖：
org.springframework.boot
spring-boot-starter-jdbc
com.alibaba
druid-spring-boot-starter
1.2.8
mysql
mysql-connector-java
5.1.49
yml文件配置
spring:
datasource:
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://localhost:3306/j220501?useUnicode=true&characterEncoding=utf8&useSSL=false
username: root
password: YOGr1hAd5Yi65JlFGKdVv010LaxT1M3SfDdSQ9Gqso6ccHAL5fxfjzlon0B8BPLfzEGz0llw97dXfIK8YDs8qw==
druid:
initial-size: 1
min-idle: 3
max-active: 20
# 配置获取连接等待超时的时间
max-wait: 60000
# 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
time-between-eviction-runs-millis: 60000
# 配置一个连接在池中最小生存的时间，单位是毫秒
min-evictable-idle-time-millis: 30000
validation-query: select 'x'
test-while-idle: true
#建议配置为false。获取连接时执行validationQuery检测连接是否有效，这个配置会降低性能
test-on-borrow: false
#建议配置为false。获取连接时执行validationQuery检测连接是否有效，这个配置会降低性能
test-on-return: false
# 打开PSCache，并且指定每个连接上PSCache的大小
pool-prepared-statements: true
max-pool-prepared-statement-per-connection-size: 20
#配置监控统计拦截的filters，去掉后监控界面sql无法统计
filters: config,stat,slf4j
# 通过connectProperties属性来打开mergeSql功能；慢SQL记录
connection-properties: ruid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000;config.decrypt=true;config.decrypt.key=MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAM1CwAKEYnsOsT44An+pEBJM+uFh7/kmftHZz44ZiwfX6eJX4jxSiR9XF3KJZUwLrdN7twz08y557+yg4/EPaLMCAwEAAQ==
# 合并多个DruidDataSource的监控数据
use-global-data-source-stat: true
#采集数据库监控的数据
web-stat-filter:
url-pattern: /*
enabled: true
exclusions: .js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*
#展示监控信息
stat-view-servlet:
url-pattern: /druid/*
allow: 127.0.0.1
reset-enable: false
#是否开启，设置为true才能打开监控页面
enabled: true
#druid监控登录页面的用户名
login-username: root
#druid监控登录页面的密码
login-password: root2.配置mybatis-plus
pom.xml引入依赖
com.baomidou
mybatis-plus-boot-starter
3.3.2
com.baomidou
mybatis-plus-generator
3.3.2
org.freemarker
freemarker
2.3.28
yml文件配置
mybatis-plus:
mapper-locations: classpath*:com/hqyj/*/*/mapper/*Mapper.xml
type-aliases-package: com.hqyj.*.*.entity
global-config:
db-config:
#主键类型 AUTO:"数据库ID自增" INPUT:"用户输入ID",ASSIGN_ID:"mybatisplus分配ID，Long，Integer，String", ASSIGN_UUID:"分配UUID，String";
id-type: auto
#字段策略 IGNORED:"忽略判断" NOT_NULL:"非 NULL 判断") NOT_EMPTY:"非空判断"
#filed-strategy在高版本被废弃(3.1.2以后)
#filed-strategy: NOT_EMPTY
insert-strategy: not_empty
select-strategy: not_empty
update-strategy: not_empty
#刷新mapper 调试神器
refresh-mapper: true
#逻辑删除配置
logic-delete-value: 1
logic-not-delete-value: 0
configuration:
#驼峰下划线转换
map-underscore-to-camel-case: true
cache-enabled: false3.代码生成器
创建CodeGenerator类：
public class CodeGenerator {
/**
*
* 读取控制台内容
*
*/
public static String scanner(String tip) {
Scanner scanner = new Scanner(System.in);
StringBuilder help = new StringBuilder();
help.append("请输入" + tip + "：");
System.out.println(help.toString());
if (scanner.hasNext()) {
String ipt = scanner.next();
if (!StringUtils.isEmpty(ipt)) {
return ipt;
}
}
throw new MybatisPlusException("请输入正确的" + tip + "！");
}
public static void main(String[] args) {
// 代码生成器
AutoGenerator mpg = new AutoGenerator();
// 全局配置
GlobalConfig gc = new GlobalConfig();
// String projectPath = System.getProperty("user.dir");
// gc.setOutputDir(projectPath + "/src/main/java");
String projectPath = "D://mybatisCode";
gc.setOutputDir(projectPath);
gc.setAuthor("sdx2009");
//设置完之后是否打开资源管理器
gc.setOpen(false);
gc.setSwagger2(false);
gc.setIdType(IdType.AUTO);
//设置是否覆盖原始生成的文件
gc.setFileOverride(true);
gc.setActiveRecord(false);// 不需要ActiveRecord特性的请改为false
gc.setEnableCache(false);// XML 二级缓存
gc.setBaseResultMap(true);// XML ResultMap
gc.setBaseColumnList(true);// XML columList
//去掉service的i前缀
gc.setServiceName("%sService");
mpg.setGlobalConfig(gc);
// 数据源配置
DataSourceConfig dsc = new DataSourceConfig();
dsc.setDbType(DbType.MYSQL);
dsc.setDriverName("com.mysql.jdbc.Driver");
dsc.setUsername("root");
dsc.setPassword("123456");
dsc.setUrl(
"jdbc:mysql://127.0.0.1:3306/j220501?useUnicode=true&characterEncoding=utf8");
mpg.setDataSource(dsc);
// 包配置
PackageConfig pc = new PackageConfig();
pc.setModuleName("user");// 模块名
pc.setParent("com.hqyj.springbootdemo01");
mpg.setPackageInfo(pc);
// 自定义配置
InjectionConfig cfg = new InjectionConfig() {
@Override
public void initMap() {
// to do nothing
}
};
List focList = new ArrayList<>();
focList.add(new FileOutConfig("/templates/mapper.xml.ftl") {
@Override
public String outputFile(TableInfo tableInfo) {
// 自定义输入文件名称
return projectPath + "/src/main/resources/mapper/" + pc.getModuleName() + "/"
+ tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML;
}
});
cfg.setFileOutConfigList(focList);
mpg.setCfg(cfg);
mpg.setTemplate(new TemplateConfig().setXml(null));
// 策略配置
StrategyConfig strategy = new StrategyConfig();
strategy.setTablePrefix(new String[]{""});// 此处可以修改为您的表前缀
strategy.setNaming(NamingStrategy.underline_to_camel);
// strategy.setColumnNaming(NamingStrategy.underline_to_camel);
// strategy.setSuperEntityClass("com.baomidou.ant.common.BaseEntity");
strategy.setRestControllerStyle(true);
// strategy.setSuperControllerClass("com.baomidou.ant.common.BaseController");
strategy.setInclude("user");// 表名
// strategy.setSuperEntityColumns("id");
// strategy.setControllerMappingHyphenStyle(true);
// strategy.setTablePrefix(pc.getModuleName() + "_");
strategy.setEntityTableFieldAnnotationEnable(true);
// strategy.setLogicDeleteFieldName("del_flag");
//设置是否启用Lombok
strategy.setEntityLombokModel(true);
List tableFillList = new ArrayList();
TableFill tableFill1 = new TableFill("create_time", FieldFill.INSERT);
TableFill tableFill2 = new TableFill("creator", FieldFill.INSERT);
TableFill tableFill3 = new TableFill("update_time", FieldFill.UPDATE);
TableFill tableFill4 = new TableFill("operator", FieldFill.UPDATE);
tableFillList.add(tableFill1);
tableFillList.add(tableFill2);
tableFillList.add(tableFill3);
tableFillList.add(tableFill4);
strategy.setTableFillList(tableFillList);
mpg.setStrategy(strategy);
mpg.setTemplateEngine(new FreemarkerTemplateEngine());
mpg.execute();
}
} 修改相关配置后，运行即可产生代码文件，产生的代码文件包含：
*Mapper.xml、entity实体类、mapper类、service接口、service实现类、controller
将以上文件拷贝到项目相应的目录下即可。
自动填充处理器：
创建handler层
package com.hqyj.j220701.springboot.springbootdemo01.handler;
import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import org.apache.ibatis.reflection.MetaObject;
import org.springframework.stereotype.Component;
import java.time.LocalDateTime;
@Component
public class MyMetaObjectHandler implements MetaObjectHandler {
@Override
public void insertFill(MetaObject metaObject) {
Object createTime = getFieldValByName("createTime", metaObject);
if (null == createTime){
setFieldValByName("createTime", LocalDateTime.now(),metaObject);
}
Object creator = getFieldValByName("creator", metaObject);
if (null == creator){
setFieldValByName("creator","system",metaObject);
}
}
@Override
public void updateFill(MetaObject metaObject) {
Object updateTime = getFieldValByName("updateTime", metaObject);
if (null == updateTime){
setFieldValByName("updateTime", LocalDateTime.now(),metaObject);
}
Object operator = getFieldValByName("operator", metaObject);
if (null == operator){
setFieldValByName("operator","system",metaObject);
}
}
}
2.数据操作
条件构造器
以下操作均在serverImpl实现类上实现
1.保存数据(添加数据)
单条保存： this.save();
批量保存： this.saveBatch();
2.修改数据
根据id修改： this.updateById();
通过创建updatewrapper对象作为条件修改：
@Override
public boolean updateUser(Integer id, String userName, String password) {
User user = new User();
user.setUserName(userName);
user.setPassword(password);
UpdateWrapper wrapper = new UpdateWrapper<>();
wrapper.eq("id", id);
return this.update(user, wrapper);
} 批量修改：
@Override
public boolean updateUser(Integer id, String userName, String password) {
User user = new User();
user.setUserName(userName);
user.setPassword(password);
user.setId(id);
List userList = new ArrayList<>();
userList.add(user);
return this.updateBatchById(userList);
} 3.查询数据
条件查询
@Override
public User getUser(String userName, String password) {
QueryWrapper wrapper = new QueryWrapper<>();
wrapper.eq("user_name", userName);
wrapper.eq("password",password);
return this.getOne(wrapper);
} 相当于：WHERE (user_name = ? AND password = ?)
and与or组合查询：
@Override
public User getUser(String userName, String password) {
QueryWrapper wrapper = new QueryWrapper<>();
wrapper.eq("user_name", userName);
wrapper.eq("password", password);
wrapper.and(w -> w.eq("user_name", userName).or().eq("password", password));
return this.getOne(wrapper);
} 相当于：
WHERE (user_name = ? AND password = ? AND (user_name = ? OR password = ?))
分页查询
@Override
public Page getPageUser(Integer pageNumber, Integer pageSize, String userName,
String password) {
//分页信息
Page page = new Page<>();
//每页多少条数据
page.setSize(pageSize);
//第几页
page.setCurrent(pageNumber);
//筛选条件
QueryWrapper wrapper = new QueryWrapper<>();
wrapper.eq("user_name", userName);
wrapper.eq("password", password);
return this.page(page, wrapper);
} 分页查询需使用泛型返回结果对象
创建Result类
@Data
public class Result {
private Integer code;
private String msg;
private T data;
/**
* 返回成功
*
* @return
*/
public Result success() {
return success("操作成功!");
}
public Result success(String message) {
return success(200, message);
}
public Result success(Integer code, String message) {
this.setCode(code);
this.setMsg(message);
return this;
}
public Result put(T obj) {
this.setData(obj);
return this;
}
/**
* 返回失败
*
* @param code
* @param message
* @return
*/
public Result error(Integer code, String message) {
return success(code, message);
}
public Result error(String message) {
return error(500, message);
}
public Result error() {
return error("操作失败！");
}
} 在controller中使用Result作为返回对象
@GetMapping("/info")
public Result getUser(String userName, String password) {
User user = userService.getUser(userName, password);
return new Result<>().success().put(user);
}解决MybatisPlus中page的total为0及未分页的问题：添加分页插件
@Configuration
public class MybatisPlusPaginationConfig {
@Bean
public PaginationInterceptor paginationInterceptor() {
PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
return paginationInterceptor;
}
}泛型分页查询结果返回对象：
@Data
public class PageResult {
private Integer code;
private String msg;
private Long total;
private Long totalPage;
private Long pageNumber;
private List rows;
/**
* 默认构造方法
*/
public PageResult() {
}
public PageResult(Long total, List rows, Long pageNumber, Long pageSize) {
this.total = total;
this.rows = rows;
this.pageNumber = pageNumber;
this.code = 200;
this.msg = "";
Long totalPage = total / pageSize;
if (total % pageSize > 0) {
totalPage++;
}
this.totalPage = totalPage;
}
} 在controller中统一使用PageResult对象作为返回对象：
@GetMapping("/page")
public PageResult getPageUser(Integer pageNumber, Integer pageSize, String userName,
String password) {
Page page = userService.getPageUser(pageNumber, pageSize, userName, password);
PageResult result = new PageResult<>(page.getTotal(), page.getRecords());
return result;
} 多表查询
4.删除数据
根据id删除：this.removeById();
3.综合实现
实现单表的增删改分页以及多表查询
①首先需要创建2个结果类：Result，PageResult
Result类:
抽取controller层的逻辑判断成一个单独类，判断service层方法的成功与失败
package com.hqyj.j220701.springboot.springbootdemo01.common.result;
import lombok.Data;
import java.io.Serializable;
@Data
public class Result implements Serializable {
private Integer code;
private String msg;
private T data;
public Result() {
}
public Result(Integer code, String msg, T data) {
this.code = code;
this.msg = msg;
this.data = data;
}
//如果成功，返回成功的方法，
public Result success(Integer code,String msg){
this.code = code;
this.msg = msg;
return this;
}
public Result success(String msg){
return success(200,msg);
}
public Result success(){
return success("操作成功");
}
public Result put(T data){
this.data = data;
return this;
}
// 失败返回失败的方法
public Result error(Integer code,String msg){
this.code = code;
this.msg = msg;
return this;
}
public Result error(String msg){
return error(500,msg);
}
public Result error(){
return error("操作失败");
}
}
PageResult类：
分页公共结果类，设置页面展示参数
package com.hqyj.j220701.springboot.springbootdemo01.common.result;
import lombok.Data;
import java.io.Serializable;
import java.util.List;
@Data
public class PageResult implements Serializable {
private Integer code;
private String msg;
private List list;
private Long pageNumber;
private Long pageSize;
private Long total;
private Long totalPage;
public PageResult(Long totalPage, Long pageNumber, Long pageSize, Long total, List list) {
this.list = list;
this.pageNumber = pageNumber;
this.pageSize = pageSize;
this.total = total;
this.totalPage = totalPage;
}
}
②创建entity实体类联系数据库，创建dto层联系前端
user实体类(由代码生成器生成)
package com.hqyj.j220701.springboot.springbootdemo01.user.entity;
import com.baomidou.mybatisplus.annotation.*;
import lombok.Data;
import lombok.EqualsAndHashCode;
import java.io.Serializable;
import java.time.LocalDateTime;
/**
*
*
*
*
* @author sdx2009
* @since 2022-09-22
*/
@Data
@EqualsAndHashCode(callSuper = false)
@TableName("user")
public class User implements Serializable {
private static final long serialVersionUID = 1L;
//主键
@TableId(value = "id", type = IdType.AUTO)
private Integer id;
@TableField("user_name")
private String userName;
@TableField("password")
private String password;
@TableField("sex")
private String sex;
@TableField("age")
private Integer age;
@TableField(value = "create_time", fill = FieldFill.INSERT)
private LocalDateTime createTime;
@TableField(value = "creator", fill = FieldFill.INSERT)
private String creator;
@TableField(value = "update_time", fill = FieldFill.UPDATE)
private LocalDateTime updateTime;
@TableField(value = "operator", fill = FieldFill.UPDATE)
private String operator;
}
在dto层，分别创建3个信息类
QueryUser:查询用户与前端交互实现分页
package com.hqyj.j220701.springboot.springbootdemo01.user.dto;
import lombok.Data;
@Data
public class QueryUser {
private Integer pageNumber;
private Integer pageSize;
private String userName;
private String password;
private String sex;
private Integer age;
private Integer id;
}
UserInfo：只对用户信息基础操作
package com.hqyj.j220701.springboot.springbootdemo01.user.dto;
import lombok.Data;
@Data
public class UserInfo {
private String userName;
private String password;
private String sex;
private Integer age;
private Integer id;
}
UserRole:多表查询
package com.hqyj.j220701.springboot.springbootdemo01.user.dto;
import lombok.Data;
@Data
public class UserRole {
private Integer userId;
private String userName;
private Integer roleId;
private String roleCode;
private String roleName;
}
③编写多表查询的sql
在resources下的mapper.xml中编写
id, user_name, password, sex, age, create_time, creator, update_time, operator
④在controller层编写增删改操作
package com.hqyj.j220701.springboot.springbootdemo01.user.controller;
import com.alibaba.fastjson.JSONObject;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.hqyj.j220701.springboot.springbootdemo01.common.result.PageResult;
import com.hqyj.j220701.springboot.springbootdemo01.common.result.Result;
import com.hqyj.j220701.springboot.springbootdemo01.user.dto.QueryUser;
import com.hqyj.j220701.springboot.springbootdemo01.user.dto.UserInfo;
import com.hqyj.j220701.springboot.springbootdemo01.user.dto.UserRole;
import com.hqyj.j220701.springboot.springbootdemo01.user.entity.User;
import com.hqyj.j220701.springboot.springbootdemo01.user.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.util.CollectionUtils;
import org.springframework.web.bind.annotation.*;
import java.util.List;
@RestController//以json字符串返回结果
@RequestMapping("/api/user")
public class UserController {
@Autowired
private UserService userService;
@PostMapping("/add")
public Result addUser(@RequestBody UserInfo userInfo){
boolean result = userService.addUser(userInfo);
if (result){
return new Result<>().success().put(result);
}else {
return new Result<>().error();
}
}
@PostMapping("/update")
public Result updateUser(@RequestBody UserInfo userInfo){
boolean result = userService.updateUser(userInfo);
if (result){
return new Result<>().success().put(result);
}else {
return new Result<>().error();
}
}
@GetMapping("/delete")
public Result deleteUser(@RequestParam Integer id){
boolean result = userService.deleteUser(id);
if (result){
return new Result<>().success().put(result);
}else {
return new Result<>().error();
}
}
@GetMapping("/page")
public PageResult getUserPage(QueryUser queryUser){
Page page = userService.getUserPage(queryUser);
PageResult result = new PageResult(page.getCurrent(),page.getSize(),
page.getTotal(),page.getPages(),page.getRecords());
result.setCode(200);
return result;
}
//多表查询
@GetMapping("/list/v2")
public Result getUserListV2(UserInfo userInfo){
List list = userService.getUserListV2(userInfo);
if (CollectionUtils.isEmpty(list)){
return new Result<>().error();
}
return new Result<>().success().put(list);
}
//多表分页查询
@GetMapping("/page/v2")
public PageResult getUserPageV2(QueryUser queryUser){
Page list = userService.getUserPageV2(queryUser);
PageResult result = new PageResult<>(list.getCurrent(),list.getSize(),
list.getTotal(),list.getPages(),list.getRecords());
result.setCode(200);
return result;
}
}
⑤在service服务层实现方法
接口类
package com.hqyj.j220701.springboot.springbootdemo01.user.service;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.IService;
import com.hqyj.j220701.springboot.springbootdemo01.user.dto.QueryUser;
import com.hqyj.j220701.springboot.springbootdemo01.user.dto.UserInfo;
import com.hqyj.j220701.springboot.springbootdemo01.user.dto.UserRole;
import com.hqyj.j220701.springboot.springbootdemo01.user.entity.User;
import java.util.List;
/**
*
* 服务类
*
*
* @author sdx2009
* @since 2022-09-22
*/
public interface UserService extends IService {
boolean addUser(UserInfo userInfo);
boolean updateUser(UserInfo userInfo);
boolean deleteUser(Integer id);
List getUserList(QueryUser queryUser);
Page getUserPage(QueryUser queryUser);
List getUserListV2(UserInfo userInfo);
Page getUserPageV2(QueryUser queryUser);
}
实现类
package com.hqyj.j220701.springboot.springbootdemo01.user.service.impl;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hqyj.j220701.springboot.springbootdemo01.user.dto.QueryUser;
import com.hqyj.j220701.springboot.springbootdemo01.user.dto.UserInfo;
import com.hqyj.j220701.springboot.springbootdemo01.user.dto.UserRole;
import com.hqyj.j220701.springboot.springbootdemo01.user.entity.User;
import com.hqyj.j220701.springboot.springbootdemo01.user.mapper.UserMapper;
import com.hqyj.j220701.springboot.springbootdemo01.user.service.UserService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
*
* 服务实现类
*
*
* @author sdx2009
* @since 2022-09-22
*/
@Service
public class UserServiceImpl extends ServiceImpl implements UserService {
@Autowired
private UserMapper userMapper;
@Override
public boolean addUser(UserInfo userInfo) {
User user = new User();
BeanUtils.copyProperties(userInfo, user);
return this.save(user);
}
@Override
public boolean updateUser(UserInfo userInfo) {
User user = new User();
BeanUtils.copyProperties(userInfo, user);
return this.updateById(user);
}
@Override
public boolean deleteUser(Integer id) {
return this.removeById(id);
}
@Override
public List getUserList(QueryUser queryUser) {
QueryWrapper wrapper = new QueryWrapper<>();
// 相当于user_name=#{userName}
/* wrapper.eq("user_name",queryUser.getUserName());
wrapper.eq("password",queryUser.getPassword());
wrapper.lt("age",queryUser.getAge());
// OR sex LIKE %sex%
wrapper.or().like("sex",queryUser.getSex());*/
// userName = #{userName} AND (password=#{password} OR sex LIKE %sex%)
wrapper.eq("user_name", queryUser.getUserName()).
and(w -> w.eq("password", queryUser.getPassword()).
or().like("sex", queryUser.getSex()));
return this.list(wrapper);
}
@Override
public Page getUserPage(QueryUser queryUser) {
// page对象中的current默认为1，如果参数中的pageNumber<=1，则page对象按照current=1分页
Page page = new Page<>();
page.setCurrent(queryUser.getPageNumber());
page.setSize(queryUser.getPageSize());
//TODO 带条件查询的操作
// 按密码查询
QueryWrapper wrapper = new QueryWrapper<>();
if (null != queryUser.getPassword()) {
wrapper.eq("password", queryUser.getPassword());
}
return this.page(page,wrapper);
}
// 多表查询
@Override
public List getUserListV2(UserInfo userInfo) {
Map params = new HashMap<>();
params.put("userName",userInfo.getUserName());
List list = userMapper.selectUserList(params);
return list;
}
@Override
public Page getUserPageV2(QueryUser queryUser) {
Page page = new Page<>();
page.setCurrent(queryUser.getPageNumber());
page.setSize(queryUser.getPageSize());
Map params = new HashMap<>();
params.put("userName",queryUser.getUserName());
return userMapper.selectUserList(page,params);
}
}
⑥最后在mapper层实现多表查询的方法对应xml文件
package com.hqyj.j220701.springboot.springbootdemo01.user.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.hqyj.j220701.springboot.springbootdemo01.user.dto.UserRole;
import com.hqyj.j220701.springboot.springbootdemo01.user.entity.User;
import org.apache.ibatis.annotations.Param;
import java.util.List;
import java.util.Map;
/**
*
* Mapper 接口
*
*
* @author sdx2009
* @since 2022-09-22
*/
public interface UserMapper extends BaseMapper {
List selectUserList(@Param("params") Map params);
Page selectUserList(Page page,@Param("params") Map params);
}
可以使用postman调试接口。