Mybatis Plus custom SQL + + multi-table query result pagination

The basic use of about Mybatis plus not go into details.

Getting venue: https://mybatis.plus/guide/

 

I just record it "Custom SQL + + multi-table query results page" in the case, how to use

Environment: SpringBoot 2.1 + Mybatis Plus 3.1.0

We need to configure mybatis plus pager

@Configuration
public class MyBatisPlusConfig {
    
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        return new PaginationInterceptor();
    }

}

Custom Sql write directly on the Mapper interface methods used @Select comment

This relates to the Sql table 3, the result is a combination of two fields from the table, I have here created a common Java object (i.e. Product) received.

@Select("<script>"
+ " select tp.*,tpt.name as typeName "
+ " from jfcloud_product tp left join jfcloud_product_type_ref ref on tp.id=ref.product_id"
+ " left join jfcloud_product_type tpt on ref.type_id = tpt.id"
+ " where 1=1"
+ " and tp.is_delete=0"
+ " <if test=\"q.typeId != null\">and tpt.id = #{q.typeId} </if>"
+ " order by tp.create_time desc"
+ "</script>")
IPage<Product> getProductPage(IPage<Product> page,@Param("q") ProductQuery query);

parameter list:

page is paged objects mybatis plus offer, which the generic entity filled my custom multi-table this field.

query is custom entity, which is the query parameters to be used, an alias is defined by @Param "q", in Sql may be used to # {q.xxx}

Two parameters in accordance with the order of the best I above this, tracked at the source, will throw an exception if the parameter exchange position, mybatis plus data into making return

Specific use:

ProductQuery query = new ProductQuery();
query.setTypeId(1l);
		
Page<Product> page = new Page<>(1,10);
		
IPage<Product> datas = productMapper.getProductPage(page,query);
		
		
System.out.println("总记录："+datas.getTotal());
System.out.println("总页数："+datas.getPages());
System.out.println("数据："+datas.getRecords());