On Wed, 8 Apr 2009, Pete Wilson wrote:
Hi everyone --
I'm a MySQL noob. I have MySQL queries in my C code and I was surprised
to find I'm getting a success return from:
mysql_query(pmysql, "select * from usrs where(usr=\"illegal name\"");
In this table called "usrs," "usr" is the primary key and the engine is
myisam. I expected an error return from this query on "illegal name,"
which is not in the table.
An error is not returned until I call:
prow = mysql_fetch_row(pmysqlres));
which returns NULL, which is great.
If I run that same select from the command line, I see:
mysql> select * from usrs where (usr="illegal name");
Empty set (0.00 sec)
My question, finally: Is this response to my program call expected and
normal for MySQL? I suppose it is, but I just want to make sure that the
behavior is OK, that indeed the program call to mysql_query(select ...)
must always in these circumstances return success.
Thanks!
-- Pete Wilson
Hi Pete
I suspect that "illegal name" means that this value is not existing in the
table. Right?
But this query is perfectly correct and should not throw an error. It's
like
select * from table where 1 = 0;
which returns nothing, the correct answer.
Tom
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