不進行輸入線搜索

-1

CREATE DEFINER=`root`@`localhost` PROCEDURE `GetClients`(
clientPIB NVARCHAR(50), 
    pageSize INT, 
    pageIndex INT) 
    BEGIN 
    DECLARE startIndex INT; 
    SET startIndex = pageSize * pageIndex; 
    SELECT Id, FirstName, LastName, MiddleName 
    FROM Client 
     WHERE 
     FirstName Like(CASE WHEN clientPIB IS NULL THEN FirstName ELSE '%' + clientPIB + '%' END) OR 
     LastName Like(CASE WHEN clientPIB IS NULL THEN LastName ELSE '%' + clientPIB + '%' END) OR 
     MiddleName Like(CASE WHEN clientPIB IS NULL THEN MiddleName ELSE '%' + clientPIB + '%' END) 
     LIMIT startIndex, pageSize; 
    END

的客戶表中有一個字段當我沒有指定搜索條件，然後一個名稱或名稱 - 一切都很好不進行輸入線搜索