spring boot + mybaties plus

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 1：首先创建一个新的spring boot项目 

2: 引入必要的依赖

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus-boot-starter</artifactId>
        <version>3.0.1</version>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
        <groupId>com.microsoft.sqlserver</groupId>
        <artifactId>mssql-jdbc</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <!-- https://mvnrepository.com/artifact/com.baomidou/mybatis-plus -->
    <dependency>
        <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus</artifactId>
        <version>3.0.2</version>
    </dependency>
</dependencies>

3：配置数据源 ，在resources文件夹,新建的spring boot的项目下就有一个application.properties文件,本人喜欢yml结尾的，所以修改

application.properties文件名为 application.yml，最好修改一下，
   配置文件内容就是配置一下数据源
   

spring:
    datasource:
      driver-class-name: com.microsoft.sqlserver.jdbc.SQLServerDriver
      url: jdbc:sqlserver://localhost:1433;databaseName=Test
      username: sa
      password: root
server:
  port: 8081

4: 项目整体结构如下

5：创建一个实体类 people
   

6：创建一个PeopleMapper类

7：在启动类上加上注解

@MapperScan（括号里面就是PeopleMapper类的路径）

8: 接下来就可以开始测试了

@RunWith(SpringRunner.class)
@SpringBootTest
public class MpApplicationTests {

    @Resource
    private PeopleMapper userMapper;

    //添加一个用户
    @Test
    public void contextLoads() {
       People p = new People();
       p.setName("b123");
       p.setAge("1234");
       userMapper.insert(p);
       //得到返回的主键ID
        int id =  p.getId();

    }

    //根据用户ID删除记录
    @Test
    public void delete(){
        userMapper.deleteById(5);
    }

    //根据主键修改
    @Test
    public void update(){
         People p = new People();
         p.setName("bao");
         p.setAge("18");
         p.setId(1);
         userMapper.updateById(p);

    }

    //根据不同的条件查询
    @Test
    public void select() {
        People p = new People();
        // name 和 age  都是数据库People表的字段
        //该查询语句==》查询 select * from People where name = ‘b‘ and age between 124  and 1235;
        //当然后面还是可以继续添加条件
        List<People> list = userMapper.selectList(new QueryWrapper<People>().eq("name","b").
                between("age",124,1235));
        for(People people:list){
            System.out.println(people.getAge()+"====="+people.getName());
        }
    }
}

spring boot + mybaties plus

标签：分享   HERE   .com   work   开始   sql   接下来   load   username   

原文地址：https://www.cnblogs.com/bjh-123/p/9650324.html