Mysql if语句忽略第一个条件

Question

我在 mysql 过程中有一个 if 语句，如下所示:

if myQuery like '%فواید%' or myQuery like '%مضرات%' or myQuery like 
'%خواص%' or myQuery like '%عوارض%' then
set  EHSfour= b'1';
end if;

令我惊讶的是，我发现上面的 if 语句忽略了 myQuery，如 '%فف٠%'。它会检查其他条件，并在 myQuery 类似于 '%ğ׶ר׵%' 或 '%ففف%' 或 '%ففف%' 时设置 EHSfour = 1，但在 时则不会设置 EHSfour = 1 myQuery 类似于 '%فف׏%'。

为什么 mysql 会这样工作？在什么情况下mysql可能会出现这样的错误？

mysql版本是5.7，我使用的是mysql workbench 6.3 CE。

更新: 在我的代码中我有:

if EHSfour = b'1' then
set myEHSkind = 4;

然后:

update new_tbl_health set EHS_kind = myEHSkind where ID = myID;

这是我的整个过程:

CREATE DEFINER=`root`@`localhost` PROCEDURE `fillEHSKind`()
BEGIN
declare myEHSkind int default 0;
declare EHSone,EHStwo,EHSthree,EHSfour bit;
declare myID int(11);
declare myQuery varchar(500);
declare v_finished integer default 0;
declare myCursor cursor for select ID,Query from new_tbl_health;
declare continue handler for not found set v_finished = 1;
open myCursor;
myLoop: loop
fetch myCursor into myID,myQuery;
if v_finished = 1 then
leave myLoop;
end if;

set EHSone = b'0';
set EHStwo = b'0';
set EHSthree = b'0';
set EHSfour = b'0';
set myEHSkind = 0;

if myQuery like '%بیمارستان%' or myQuery like '%دکتر%' or myQuery like 
'%پزشک%' then
set  EHSone= b'1';
end if;

if myQuery like '%بیماری%' or myQuery like '%مریضی%'
set EHStwo = b'1';
end if;

if myQuery like '%علایم%' or myQuery like '%نشانه%' or myQuery like 
'%علت%' or myQuery like '%خارش%'  then
set EHSthree = b'1';
end if;

if myQuery like '%فواید%' or myQuery like '%مضرات%' or myQuery like 
'%خواص%' 
or myQuery like '%عوارض%' then
set  EHSfour= b'1';
end if;

if EHSone = b'1' and EHStwo = b'1' and EHSthree=b'1' then
set myEHSkind = 8;
elseif EHSone = b'1' and EHStwo = b'1' then
set myEHSkind = 5;
elseif EHSone = b'1' and EHSthree = b'1' then
set myEHSkind = 6;
elseif EHStwo = b'1' and EHSthree = b'1' then
set myEHSkind = 7;
elseif EHSone = b'1' then
set myEHSkind = 1;
elseif EHStwo = b'1' then
set myEHSkind = 2;
elseif EHSthree = b'1' then
set myEHSkind = 3;
elseif EHSfour = b'1' then
set myEHSkind = 4;
end if;

update new_tbl_health set EHS_kind = myEHSkind where ID = myID;
end loop myLoop;
END

Answer 1

我没有以这种方式使用 if，但很可能，您的 if 语句仅影响与条件匹配的第一行。

如果您想更新所有符合条件的行，您可以尝试以下操作:

update #tableName set EHSfour= b'1' where (myQuery like '%فواید%' or myQuery like '%مضرات%' or myQuery like '%خواص%' or myQuery like '%عوارض%');