Question

I am fetching the three values from TUsers using select query where I am getting the error as

Mysqli statement execute error : Result consisted of more than one row.

I have used DISTINCTROW for avoiding duplication and I am using Zend framework to call the procedure.

Here is the code:

Procedure:

         CREATE DEFINER=`root`@`` PROCEDURE `spfetchloginid`(in securityans   varchar(50),out email varchar(50),out loginidout varchar(50),out useridout varchar(50))
         BEGIN

         SELECT DISTINCTROW Email,login_id,user_id into email,loginidout,useridout  FROM DB.TUsers where SecurityAns=securityans ;

         END

Calling the Procedure in ZendFramework from Controller:

            $db=Zend_Db_Table::getDefaultAdapter();
        $spParams = array(1,'NewValue');
        $stmt = $db->query("CALL   spfetchloginid('$securityans',@email,@loginidout,@useridout)");

        print_r($stmt->fetchAll());
        $stmt->closeCursor();   

        $stmtresult10=$db->query("select @email");
        $email_to=$stmtresult10->fetch();
        $stmtresult10->closeCursor();
        $Emails=$email_to["@email"];
         echo $Emails;  

        $stmtresult11=$db->query("select @loginidout");
        $loginid=$stmtresult11->fetch();
        $stmtresult11->closeCursor();

        $loginids=$loginid["@loginidout"];
        echo $loginids; 

        $stmtresult12=$db->query("select @useridout");
        $userid=$stmtresult12->fetch();
        $stmtresult12->closeCursor();

        $userids=$userid["@useridout"]; 

        echo $userids;

Please tell me any good suggestions when using Zend and My Sql for calling the procedures.

Answer 1

From the fine manual:

DISTINCT specifies removal of duplicate rows from the result set. […] DISTINCTROW is a synonym for DISTINCT.

So saying this:

SELECT DISTINCTROW Email, login_id, user_id
...
where SecurityAns = securityans

just removes duplicates from the result set but if you have multiple rows with the same SecurityAns and they’re all securityans, then your query will return multiple rows. If SecurityAns is an answer to a standard question like “what is your favorite color” or “what was your mother’s maiden name” then you should be expecting a lot of duplicates so SecurityAns is certainly not sufficient to guarantee uniqueness.

You need to add more to the WHERE clause to guarantee unique results. Or, you could add LIMIT 1 but that’s just a bandage over the real problem.

You’re also probably running into a problem with your WHERE clause:

where SecurityAns = securityans

the should be true for every row in the table because I think the securityans column name will be used rather than the securityans parameter. Try using a different parameter name. For example, I see your duplicate problem with a procedure like this:

create procedure p(in id int, out result int)
begin
    select id into result from t where id = id;
end

but not with this version:

create procedure p(in find_id int, out result int)
begin
    select id into result from t where id = find_id;
end