Mybaist 注解 foreach 嵌套循环实现批量插入
第一种写法(#使用占位符推荐):
@Insert("<script>" + " insert into ${tb} " +" <foreach collection=\"fields\" item=\"field\" separator = \",\" open='(' close=')'> " + "`${field}`" +"</foreach>" + "values" +" <foreach collection=\"list\" item='mvo' index=\"list_index\" separator = \",\" > " +" <foreach collection=\"mvo.keys\" item=\"key\" open='(' close=')' separator = \",\">" +" #{mvo.${key}} " +" </foreach> " +"</foreach>" + "</script>") int insertBatch(@Param("list")List<Map<String,Object>> housingList,@Param("fields") Set<String> keys,@Param("tb") String table) throws Exception;
执行结果:
insert into
dmp_department_work ( `functional` , `num` , `power` , `state` , `department` , `table` )
values ( ? , ? , ? , ? , ? , ? ) ,( ? , ? , ? , ? , ? , ? )
第二种写法($不使用占位符):
@Insert("<script>" + " insert into ${tb} " +" <foreach collection=\"fields\" item=\"field\" separator = \",\" open='(' close=')'> " + " `${field}`" +" </foreach>" + "values" +" <foreach collection=\"list\" item='mvo' index=\"list_index\" separator = \",\" > " +" <foreach collection=\"mvo.keys\" item=\"key\" open='(' close=')' separator = \",\">" +" '${mvo[key]}' " +" </foreach> " +"</foreach>" + "</script>") int insertBatch(@Param("list")List<Map<String,Object>> housingList,@Param("fields") Set<String> keys,@Param("tb") String table) throws Exception;
执行结果:
insert into
dmp_department_work ( `functional` , `num` , `power` , `state` , `department` , `table` )
values ( '17' , '1' , '152' , '0' , '1' , 'dmp_data_task' ) , ( '17' , '1' , '153' , '0' , '1' , 'dmp_data_meet' )
注意:
使用注解实现:
- ${}表示直接注入值, 使用#{}符号表示占位取值
- map遍历取值三种方式:item.[key] 或 item[key] 或 item.key,如果传入的是java实体,使用item.key取值