Mysql Stored procedure with cursor - mysql

Question

Mysql cursor issue?
I have written a stored procedure which will travel's record from one table and insert those into 2-3 different tables
using insert statements.
Problem is that i am checking if record is not exists in table1 then I am inserting record from temptable to table1 ,table2 sequentially
,but the condition is having some problem i don't know it its always going into else part.
Code sample is as follows:
CREATE PROCEDURE `insertData`(In clientNo INT,In usedID INT)
BEGIN
declare mame varchar(100);
declare address varchar(100);
declare city varchar(50);
declare IdentityNO1 varchar(20)
declare cur1 cursor for select * from temptable;
declare continue handler for not found set done=1;
SET #clientNo = clientNO;
SET #userID = userID;
set done = 0;
open cur1;
igmLoop: loop
fetch cur1 into Name,Address,City,IdentityNO1,clientNo;
if done = 1 then leave igmLoop; end if;
//If no record exists in some records table1,table2.
IF ( (SELECT COUNT(*) FROM table1
WHERE IndentityNo=IdentityNo1
AND clientNo=#clientNo) < = 0)
INSERT INTO table1 (Name,IdentityNO) VALUES (name,IdentityNO1);
INSERT INTO table2 (Address,City) VALUES(address,city);
ELSE
INSERT INTO tblexceptional(Name,Address,City,IdentityNo)
VALUES(name,address,city,IdentityNo1);
end loop igmLoop;
close cur1;
END

Answer 1

There is no THEN nor END IF keywords, the procedure cannot compile.
Check this link for proper syntax of IF statement: http://dev.mysql.com/doc/refman/5.7/en/if.html
Use EXIST operator instead of (SELECT count(*)... ) <=0,
read this link to know the reason: http://sqlblog.com/blogs/andrew_kelly/archive/2007/12/15/exists-vs-count-the-battle-never-ends.aspx
IF EXISTS(
SELECT null FROM table1
WHERE IndentityNo=IdentityNo1
AND clientNo=#clientNo
)
THEN
INSERT INTO table1 (Name,IdentityNO) VALUES (name,IdentityNO1);
INSERT INTO table2 (Address,City) VALUES(address,city);
ELSE
INSERT INTO tblexceptional(Name,Address,City,IdentityNo)
VALUES(name,address,city,IdentityNo1);
END IF;
I recommend using some prefixes for procedure arguments and variable names to avoid ambiguity, for example use p_ for parameters and v_ for variables. It's hard to guess, looking at this code, which name is a column name, a variable or a procedure parameter. This can lead to mistakes and errors.
Avoid using SELECT * - this code will fail if someone will change the table structure. Explicitely list required columns in the cursor declaration:
declare cur1 cursor for
select name,Address,City,IdentityNO,clientNo
from temptable;
The corrected procedure might look like this:
CREATE PROCEDURE `insertData`(In p_clientNo INT,In p_usedID INT)
BEGIN
declare v_name varchar(100);
declare v_address varchar(100);
declare v_city varchar(50);
declare v_IdentityNO varchar(20)
declare v_clientNo int
declare cur1 cursor for
select name,Address,City,IdentityNO,clientNo
from temptable;
declare continue handler for not found set done=1;
set done = 0;
open cur1;
igmLoop: loop
fetch cur1 into v_name,v_Address,v_City,v_IdentityNO,v_clientNo;
if done = 1 then leave igmLoop; end if;
//If no record exists in some records table1,table2.
IF EXISTS( SELECT 1 FROM table1
WHERE IndentityNo = v_IdentityNo
AND clientNo = v_clientNo)
INSERT INTO table1 (Name,IdentityNO) VALUES (v_name,v_IdentityNO);
INSERT INTO table2 (Address,City) VALUES(v_address,v_city);
ELSE
INSERT INTO tblexceptional(Name,Address,City,IdentityNo)
VALUES(v_name,v_address,v_city,v_IdentityNo);
END IF;
end loop igmLoop;
close cur1;
END