背景

使用mybatis-plus单表操作十分方便，但是多表联合查询感觉又回归到xml时代了，我个人比较喜欢注解的方式，但是xml要更灵活

问题点：多表多条件联合查询

时间段查询

分页查询

springboot配置文件

需要注意的是allowMultiQueries=true  允许多个sql并列执行，否则无法完成同时获取total的数据spring:

datasource:

driver-class-name: com.mysql.jdbc.Driver

url: jdbc:${DATASOURCE_DBTYPE:mysql}://${DATASOURCE_HOST:*******}:${DATASOURCE_PORT:3306}/test?characterEncoding=UTF-8&useUnicode=true&useSSL=false&allowMultiQueries=true

username: ${DATASOURCE_USERNAME:*****}

password: ${DATASOURCE_PASSWORD:******}

mybatis-plus:

configuration:

map-underscore-to-camel-case: true

global-config:

db-config:

logic-delete-value: "Y" # 逻辑已删除值(默认为 Y)

logic-not-delete-value: "N" # 逻辑未删除值(默认为 N)

mapper-locations: classpath:xml/*.xml

Configuration配置类import com.baomidou.mybatisplus.core.injector.ISqlInjector;

import com.baomidou.mybatisplus.extension.injector.LogicSqlInjector;

import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;

import org.mybatis.spring.annotation.MapperScan;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import org.springframework.transaction.annotation.EnableTransactionManagement;

@EnableTransactionManagement

@Configuration

@MapperScan("com.springboot.mybatis.mapper")

public class MybatisConfig {

/**

* 初使化Mybatis审计字段自动赋值的interceptor

*/

@Bean

public ISqlInjector sqlInjector() {

return new LogicSqlInjector();

}

/**

* 分页插件

*/

@Bean

public PaginationInterceptor paginationInterceptor() {

return new PaginationInterceptor();

}

}

mapper.xml文件

parameterType="com.springboot.dao.Select.TestSelect" resultType="java.util.List">

SELECT SQL_CALC_FOUND_ROWS

`user`.`id` AS `id`,

`user`.`name` AS `name`,

`user`.`created_time` AS `createdTime`,

`user`.`created_by` AS `createdBy`,

`class`.`classid` AS `classid`,

`class`.`classname` AS `classname`

FROM

( `user` JOIN `class` on `user`.`classid` = `class`.`id`)

1=1

AND `user`.`name` LIKE CONCAT('%',#{name},'%')

AND `class`.`num` = #{numm}

AND `user`.`created_time`>= #{createdTimeStart}

AND `user`.`created_time` <= #{createdTimeEnd}

ORDER BY `user`.`created_time` DESC

LIMIT

#{current},#{size};

SELECT FOUND_ROWS();

mapper.java文件

@Repository

@Mapper

public interface TestMapper extends BaseMapper {

List> findResultByInfo(TestSelect select);

}

查询条件实体类

@Data

public class TestSelect {

private String name;

private String classname;

private String createdTimeStart;

private String createdTimeEnd;

private Integer current;//第几页 从1开始

private Integer size;//每页几个数据

}