MySQL - Select INTO variable not working as desired - mysql

Question

I am facing a problem with the select INTO clause-
CREATE PROCEDURE `sp_user_signup`(
IN gender int,
IN dob varchar(50),
IN location int,
IN email varchar(100),
IN password varchar(50),
IN verify_uuid varchar(256),
IN fb_user bool
)
BEGIN
DECLARE User_ID INT DEFAULT 0;
DECLARE ENABLED BOOL DEFAULT TRUE;
SELECT user_id INTO User_ID FROM tbl_user_login WHERE email = email;
CALL sp_debug(ENABLED,1,User_ID,(select concat_ws('',"UserID:", User_ID)));
IF User_ID = 0 THEN
<do something>
ELSE
<do something>
END IF
END
My tbl_user_login has values for email - v.psk#gmail.com.
Even though I pass the email v.psk#gmail.com to SP it always goes into IF BLOCK.
The values of User_ID is zero from the debugs.
Thanks in advance.

Answer 1

This is not doing what you expect:
SELECT user_id INTO User_ID FROM tbl_user_login WHERE email = email;
The problem is that you think one email is a variable and the other a column. SQL can't read your mind though, so both are the column.
Prefix your variables with something to distinguish them from columns. For example:
CREATE PROCEDURE `sp_user_signup`(
IN v_gender int,
IN v_dob varchar(50),
IN v_location int,
IN v_email varchar(100),
IN v_password varchar(50),
IN v_verify_uuid varchar(256),
IN v_fb_user bool
)
BEGIN
DECLARE v_User_ID INT DEFAULT 0;
DECLARE ENABLED BOOL DEFAULT TRUE;
SELECT user_id INTO v_User_ID FROM tbl_user_login WHERE email = v_email;
CALL sp_debug(ENABLED,1,v_User_ID,(select concat_ws('',"UserID:", v_User_ID)));
IF v_User_ID = 0 THEN
<do something>
ELSE
<do something>
END IF
END