String Value in a concat procedure [closed] - php

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I know my questions sounds silly , but i'm not able to run my code because of that problem , all my procedure is correct , my only one problem is that i'm not able to use syntax that contains a string which is :
SET #query = CONCAT(#query, ' WHERE i.active=T');
I tried to use + between the apostrophe and . , however in all cases not working...
here is the full procedure
CREATE PROCEDURE stocktakess()
BEGIN
DECLARE wid INT;
DECLARE wname VARCHAR(20);
DECLARE query TEXT DEFAULT '';
DECLARE finished INT DEFAULT 0;
DECLARE whouse_cursor CURSOR FOR SELECT Id, name FROM warehouse WHERE Id IN (1,2,3,5,8);
DECLARE CONTINUE HANDLER FOR NOT FOUND SET finished = 1;
OPEN whouse_cursor;
SET #query = 'SELECT i.code,i.code2,i.description';
get_whouse: LOOP
FETCH whouse_cursor INTO wid, wname;
IF finished = 1 THEN
LEAVE get_whouse;
END IF;
SET #query = CONCAT(#query, ', SUM(CASE WHEN m.warehouseID=', wid, ' THEN COALESCE(m.qtyin, 0) - COALESCE(m.qtyout, 0) ELSE 0 END) AS `', wname, '`');
END LOOP get_whouse;
SET #query = CONCAT(#query, ' FROM items i LEFT JOIN itemmovement m ON m.itemid = i.Id');
SET #query = CONCAT(#query, ' WHERE i.active=T');
SET #query = CONCAT(#query, ' GROUP BY i.Id');
PREPARE stmt FROM #query;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
END

Answer 1

CREATE PROCEDURE stocktakess()
BEGIN
DECLARE wid INT;
DECLARE wname VARCHAR(20);
DECLARE query TEXT DEFAULT '';
DECLARE finished INT DEFAULT 0;
DECLARE whouse_cursor CURSOR FOR SELECT Id, name FROM warehouse WHERE Id IN (1,2,3,5,8);
DECLARE CONTINUE HANDLER FOR NOT FOUND SET finished = 1;
OPEN whouse_cursor;
SET #query = 'SELECT i.code,i.code2,i.description';
get_whouse: LOOP
FETCH whouse_cursor INTO wid, wname;
IF finished = 1 THEN
LEAVE get_whouse;
END IF;
SET #query = CONCAT(#query, ', SUM(CASE WHEN m.warehouseID=', wid, ' THEN COALESCE(m.qtyin, 0) - COALESCE(m.qtyout, 0) ELSE 0 END) AS `', wname, '`');
END LOOP get_whouse;
SET #query = CONCAT(#query, ' FROM items i LEFT JOIN itemmovement m ON m.itemid = i.Id');
SET #query = CONCAT(#query, ' WHERE i.active=\'T\'');
SET #query = CONCAT(#query, ' GROUP BY i.Id');
PREPARE stmt FROM #query;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
END