DELIMITER//CREATEPROCEDUREloop_through_records()BEGINDECLAREdoneINTDEFAULTFALSE;DECLAREidINT;DECLAREnameVARCHAR(255);DECLAREcurCURSORFORSELECTid,nameFROMtable_nameWHEREcondition;DECLARECONTINUEHANDLERFORNOTFOUNDSETdone=TRUE;OPENcur;read_loop:LOOPFETCHcurINTOid,name;IFdoneTHENLEAVEread_loop;ENDIF;-- 在这里可...
http://www.artfulsoftware.com Subject Views Written By Posted Loop through records using trigger 5078 Asif M June 16, 2009 05:05AM Re: Loop through records using trigger 2260 Peter Brawley June 16, 2009 12:22PM Re: Loop through records using trigger ...
if (error >= NESTED_LOOP_OK) error= join->first_select(join,qep_tab,1); ← 结束选取 } } enum_nested_loop_state sub_select(JOIN *join,JOIN_TAB *join_tab,bool end_of_records) { ... ... if (end_of_records) { enum_nested_loop_state nls= (*join_tab->next_select)(join,join_...
It is recommended not to use a directory mounted through NFS because in some environments this can cause problems whereby the lock on the.pidfile remains in effect even after the process has terminated. To startndbd, it may also be necessary to specify the host name of the management server...
It is recommended not to use a directory mounted through NFS because in some environments this can cause problems whereby the lock on the.pidfile remains in effect even after the process has terminated. To startndbd, it may also be necessary to specify the host name of the management server...
Bug #25586773: INCORRECT BEHAVIOR FOR CREATE TABLE SELECT IN A LOOP IN SP (fixed in 5.6.39) Bug #27407480: AUTOMATIC_SP_PRIVILEGES REQUIRES NEED THE INSERT PRIVILEGES FOR MYSQL.USER TABLE Bug #26997096:relay_log_spacevalue is not updated in a synchronized manner so that its value is someti...
设计flatten_subqueries函数在于减少嵌套级别,将子查询转换为连接操作,并合并了层级的where条件,它是优化器提升查询性能的一种重要手段,特别是复杂查询中包含了多层嵌套子查询时,通过减少查询的嵌套深度,可以极大提升执行效率。在深入讨论flatten_subqueries函数具体实现前,我们通过一个包含嵌套子查询的SQL语句来直观感受它的...
Can not modify more than one base table through a join view 'test.test_view' 3 游标 3.1 定义 游标使用步骤: 声明游标 DECLARE cursor_name CURSOR FOR select查询语句; 打开游标 OPEN cursor_name 使用游标 FETCH cursor_name INTO var_name [,var_name] … ...
LIMIT 0, ?; That prepared statement is executed USING the relevant variables, then I have a cursor which loops through records from the temporary table. It works, but it's very nasty! [24 Dec 2012 9:36] Erlend Dahl Fixed in 5.5.18 as a duplicate of an internally filed bug....
i have yesterday migrated a project from ms Sql to MySql, the project worked fine with Sql but now with MySql, i'm getting an error on sections where there is an async method inside a foreach loop , like the example bellowi'm using the Pomelo.EntityFrameworkCore.MySql nuget package...