The method of solving stored procedure table name passing through variable in mysql

A problem description

In the stored procedure, simply use the set or declare statement to define the variable, and then directly use it as the sql table name is not enough, mysql will treat the variable name asas table name. The same is true in other sql databases.This was not possible before mysql5.0. After 5.0, a new statement was introduced to achieve a function similar to sp_executesql (only valid for procedure, function does not support dynamic query):

Two solutions

If we need to do the insert operation in the stored procedure, according to the table name passed in from outside.The code is as follows:

drop PROCEDURE if EXISTS p_sync_data;CREATE PROCEDURE `p_sync_data`(IN pa_table_name varchar(255))BEGINDECLARE n int(10);set @currMonth=MONTH(CURDATE());set @[email protected];if @a=1 or @a=2 or @a=3 then set n=123;elseif @a=4 or @a=5 or @a=6 then set n=456;elseif @a=7 or @a=8 or @a=9 then set n=789;else set n=101112;end if;set @tbName=concat(pa_table_name,'_',n); #Use the concat splicing string function to assign the sql of the copied table to the variable sql_create_tableset @id=7;set @cname="zhangsan";set @kc="yingyu";set @fs=90;set @sql_create_table = concat('insert into ',@tbName," set `id`=?,`name`=?,`kecheng`=?,`fenshu`=?;");select @sql_create_table;# preprocessing tablePREPARE stmt FROM @sql_create_table;# execute sqlEXECUTE stmt USING @id,@cname,@kc,@fs;deallocate prepare stmt;-- insert into tb_kc_789 values(@id,@tname,@kc,@fs);end

Screenshot below

3,.execute statement

call p_sync_data("tb_kc");
commit;

4. Results data