搭建springboot工程项目,基于mybatisplus做了增删改查,多删,逻辑删除,分页条件查询

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+    <configuration name="StudySpringBoot01ApplicationTests.selectById" type="JUnit" factoryName="JUnit" temporary="true" nameIsGenerated="true">
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+        <pattern>
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+      <option name="TEST_OBJECT" value="method" />
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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.5.0</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+    <groupId>com.example</groupId>
+    <artifactId>studySpringBoot01</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>studySpringBoot01</name>
+    <description>studySpringBoot01</description>
+    <properties>
+        <java.version>1.8</java.version>
+    </properties>
+
+    <dependencies>
+
+        <dependency>
+            <groupId>com.alibaba</groupId>
+            <artifactId>druid</artifactId>
+            <version>1.1.12</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>com.baomidou</groupId>
+            <artifactId>mybatis-plus-boot-starter</artifactId>
+            <version>3.4.0</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

+package com.example.studyspringboot01;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class StudySpringBoot01Application {
+
+    public static void main(String[] args) {
+        SpringApplication.run(StudySpringBoot01Application.class, args);
+    }
+
+}

+package com.example.studyspringboot01.config;
+
+import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
+import com.baomidou.mybatisplus.extension.plugins.inner.OptimisticLockerInnerInterceptor;
+import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class MyBatisPlusConfig {
+
+    @Bean
+    public MybatisPlusInterceptor mybatisPlusInterceptor(){
+        //定义mybatisplus拦截器
+        MybatisPlusInterceptor mybatisPlusInterceptor = new MybatisPlusInterceptor();
+        //添加具体的分页拦截器
+        mybatisPlusInterceptor.addInnerInterceptor(new PaginationInnerInterceptor());
+        //添加乐观锁拦截器
+        mybatisPlusInterceptor.addInnerInterceptor(new OptimisticLockerInnerInterceptor());
+        return mybatisPlusInterceptor;
+    }
+}

+package com.example.studyspringboot01.controller;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/books")
+public class BookController {
+
+    @GetMapping("/{id}")
+    public String getById(@PathVariable Integer id){
+        System.out.println("id= " + id);
+        return "hello,springBoot程序!";
+    }
+}

+package com.example.studyspringboot01.dao;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.example.studyspringboot01.domain.User;
+import org.apache.ibatis.annotations.Mapper;
+
+@Mapper
+public interface UserDao extends BaseMapper<User> {
+}

+package com.example.studyspringboot01.domain;
+
+import com.baomidou.mybatisplus.annotation.TableLogic;
+import com.baomidou.mybatisplus.annotation.TableName;
+import lombok.Data;
+
+@TableName("tb_user")
+@Data
+public class User {
+
+    public Integer id;
+    public String username;
+    public String password;
+
+    //逻辑删除字段,标记当前字段是否被删除
+    //@TableLogic(value = "0",delval = "1")  //0表示未删除,1表示已删除
+    public Integer deleted;
+
+    public Integer version;
+
+
+}

+spring:
+  datasource:
+    type: com.alibaba.druid.pool.DruidDataSource
+    driver-class-name: com.mysql.cj.jdbc.Driver
+    url: jdbc:mysql://localhost:3306/db1?serverTimezone=UTC
+    username: root
+    password: root
+
+
+mybatis-plus:
+  global-config:
+    db-config:
+      logic-delete-field: deleted  #??????????
+      logic-not-delete-value: 0    #?????0
+      logic-delete-value: 1        #??????1

+package com.example.studyspringboot01;
+
+import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import com.example.studyspringboot01.dao.UserDao;
+import com.example.studyspringboot01.domain.User;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@SpringBootTest
+class StudySpringBoot01ApplicationTests {
+
+   @Autowired
+    private UserDao userDao;
+
+    //查询所有
+   @Test
+    public void selectAllTest(){
+       List<User> userList = userDao.selectList(null);
+       userList.forEach(s -> System.out.println(s));
+   }
+
+    //新增
+    @Test
+    public void save(){
+       User user = new User();
+       user.id = 1;
+       user.username = "dingxiongchao";
+       user.password = "223344";
+       userDao.insert(user);
+    }
+
+    //删除
+    @Test
+    public void delete(){
+       userDao.deleteById(123);
+    }
+
+    //修改
+    @Test
+    public void update(){
+       User user = new User();
+       user.id = 13;
+       user.username = "1333";
+       user.password = "1343";
+       userDao.updateById(user);
+    }
+
+    //查询单个
+    @Test
+    public void selectById(){
+       userDao.selectById(122);
+    }
+
+    //分页查询
+    @Test
+    public void page(){
+        Page page = new Page(1,2);
+        Page page1 = userDao.selectPage(page, null);
+        System.out.println("分页查询,当前是多少页:"+ page1.getCurrent());
+        System.out.println("分页查询,一页能查询几条数据:"+ page1.getSize());
+        System.out.println("分页查询,一共多少页:"+ page1.getPages());
+        System.out.println("分页查询,一共多少条数据:"+ page1.getTotal());
+        System.out.println("分页查询,当前页显示数据:" + page1.getRecords());
+    }
+
+    //多选删除
+    @Test
+    public void deleteByIds(){
+       List<Integer> list = new ArrayList<>();
+       list.add(4);
+       list.add(5);
+       list.add(9);
+       userDao.deleteBatchIds(list);
+    }
+
+
+
+
+
+
+}

+spring:
+  datasource:
+    type: com.alibaba.druid.pool.DruidDataSource
+    driver-class-name: com.mysql.cj.jdbc.Driver
+    url: jdbc:mysql://localhost:3306/db1?serverTimezone=UTC
+    username: root
+    password: root
+
+
+mybatis-plus:
+  global-config:
+    db-config:
+      logic-delete-field: deleted  #??????????
+      logic-not-delete-value: 0    #?????0
+      logic-delete-value: 1        #??????1