Mybatis-Plus3.x的创建步骤及使用教程

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.7.RELEASE</version>
    <relativePath/>
</parent>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.1.3</version>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
</dependency>
<!--lombok-->
<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <optional>true</optional>
</dependency>

<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.4.0</version>
</dependency>
<!-- 引入mysql依赖 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>

mybatis-plus:
  type-aliases-package: com.hz.entity #类型别名所在的包
  #控制台打印sql语句
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
    map-underscore-to-camel-case: false #驼峰映射
  global-config:
    db-config:
      logic-delete-field: delFlag  #全局逻辑删除字段值 3.3.0开始支持，详情看下面。
      logic-delete-value: 1        #逻辑已删除值(默认为 1)
      logic-not-delete-value: 0    #逻辑未删除值(默认为 0)
#数据库链接
spring:
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/demo?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=UTC
    username: root
    driver-class-name: com.mysql.cj.jdbc.Driver
    password: 123456
#静态资源
  resources:
    static-locations: classpath:/templates,classpath:/static/

//Spring boot方式
@EnableTransactionManagement
@Configuration
public class MybatisPlusConfig {
    /**
    * 分页插件定义
    * @return
    */
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        PaginationInterceptor paginationInterceptor = new
        PaginationInterceptor();
    // 设置请求的页面大于最大页后操作， true调回到首页，false 继续请求 默认false
    // paginationInterceptor.setOverflow(false);
    // 设置最大单页限制数量，默认 500 条，-1 不受限制
    // paginationInterceptor.setLimit(500);
    return paginationInterceptor;
}
}

@Test
public void testPageList() {
    Page<User> page = new Page<User>(1, 2);
    userMapper.selectPage(page, null);
    // 输出page对象分页查询信息
    System.out.println("总条数：" + page.getTotal());
    System.out.println("每页显示条数：" + page.getSize());
    System.out.println("总页数：" + page.getPages());
    System.out.println("当前页：" + page.getCurrent());
    System.out.println("是否有上一页：" + page.hasPrevious());
    System.out.println("是否有下一页：" + page.hasNext());
    System.out.println("查询结果：" + page.getRecords());
}

#以下为mybatis-plus配置
mybatis-plus:
    global-config:
        db-config:
            logic-delete-field: flag #全局逻辑删除字段值 3.3.0开始支持，详情看下面。
            logic-delete-value: 1 # 逻辑已删除值(默认为 1)
            logic-not-delete-value: 0 # 逻辑未删除值(默认为 0)

@Data
@TableName(value = "user") // 对应数据库表名
public class User {
    ......省略
    /**
    * 逻辑删除字段
    */
    @TableField(value="delete_flag")
    @TableLogic
    private Integer deleteFlag;
}