SELECT查詢使用可選的用戶提供的參數篩選記錄

Question

我正在編寫一個基於篩選條件從數據庫表中填寫記錄的過程。現在作爲用戶可以應用過濾器或不可以。所以基於這個過濾標準將得到應用。

即如果過濾器參數將包含任何值，只有它不會應用條件。

注：我可以通過如果實現吧..別的...條件並執行不同的查詢完全分開，讓我的願望輸出。但是，我想請教的是，有沒有它，而不是是否..任何其他更好的辦法..

例（這裏i_status_id，i_category_id可以包含任何價值或可能不會）

DELIMITER $$ 

DROP PROCEDURE IF EXISTS `FilterRecord`$$ 

CREATE PROCEDURE `FilterRecord`(IN i_status_id BIGINT,IN i_category_id BIGINT) 
BEGIN 
    SELECT 
      Item_backlog.backlog_id AS backlog_id, 
      Item_backlog.title AS backlog_name, 
      Item_backlog_Group.title AS group_Name, 
      Item_backlog.description AS description, 
      Item_backlog.est_start_date AS estimated_start_date, 
      Item_backlog.est_end_date AS estimated_end_date, 
      Item_backlog.actual_start_date AS actual_start_date, 
      Item_backlog.actual_end_date AS actual_end_date, 
      Item_backlog.estimated_hours AS estimated_hours, 
      Item_backlog.actual_hours AS actual_hours, 
      Item_backlog.status_id AS status_id, 
      APV_Status.name AS status_name , 
      Item_backlog.priority_id AS priority_id, 
      APV_Priority.name AS priority_name, 
      Item_backlog.rank AS rank, 
      Item_backlog.isActive AS isActive, 
      Item_backlog.created_by_id AS created_by_id, 
      Item_backlog.created_on AS created_on, 
      Item_backlog.modified_by_id AS modified_by_id, 
      Item_backlog.modified_on AS modified_on 
     FROM 
      Item_backlog 
     INNER JOIN  
      ApplicationParamValue AS APV_Status ON (Item_backlog.status_id=APV_Status.appParamValueId) 
     INNER JOIN  
      ApplicationParamValue AS APV_Priority ON (Item_backlog.Priority_Id=APV_Priority.appParamValueId) 
     INNER JOIN 
      Item_backlog_group AS Item_backlog_Group ON (Item_backlog.backlog_group_id=Item_backlog_Group.backlog_group_id) 
     WHERE 
      Item_backlog.status_id=i_status_id 
     AND 
      Item_backlog.category_id=i_category_id 

END$$ 

DELIMITER ; 

Answer 1

嘗試下面將應用基於參數傳遞過濾條件：

DELIMITER $$ 

DROP PROCEDURE IF EXISTS `FilterRecord`$$ 

CREATE PROCEDURE `FilterRecord`(IN i_status_id BIGINT,IN i_category_id BIGINT) 
BEGIN 

    DECLARE Var_status_id VARCHAR(200); 
    DECLARE Var_category_id VARCHAR(200); 
DECLARE andCondition VARCHAR(200); 


    IF i_status_id<>0 THEN 
     SET Var_status_id=CONCAT(' (Item_backlog.status_id = ', i_status_id,')'); 
     SET andCondition ='AND'; 
    ELSE 
     SET Var_status_id=""; 
     SET andCondition =''; 
    END IF; 


    IF i_category_id<>0 THEN 
     SET Var_category_id=CONCAT(andCondition,' (Item_artifact_category_mapping.category_id = ', i_category_id,')'); 
    ELSE 
     SET Var_category_id=""; 
    END IF; 


    SET @SQL := CONCAT('SELECT 
      Item_backlog.backlog_id AS backlog_id, 
      Item_backlog.title AS backlog_name, 
      Item_backlog_Group.title AS group_Name, 
      Item_backlog.description AS description, 
      Item_backlog.est_start_date AS estimated_start_date, 
      Item_backlog.est_end_date AS estimated_end_date, 
      Item_backlog.actual_start_date AS actual_start_date, 
      Item_backlog.actual_end_date AS actual_end_date, 
      Item_backlog.estimated_hours AS estimated_hours, 
      Item_backlog.actual_hours AS actual_hours, 
      Item_backlog.status_id AS status_id, 
      APV_Status.name AS status_name , 
      Item_backlog.priority_id AS priority_id, 
      APV_Priority.name AS priority_name, 
      Item_backlog.rank AS rank, 
      Item_backlog.isActive AS isActive, 
      Item_backlog.created_by_id AS created_by_id, 
      Item_backlog.created_on AS created_on, 
      Item_backlog.modified_by_id AS modified_by_id, 
      Item_backlog.modified_on AS modified_on 
     FROM 
      Item_backlog 
     INNER JOIN  
      ApplicationParamValue AS APV_Status ON (Item_backlog.status_id=APV_Status.appParamValueId) 
     INNER JOIN  
      ApplicationParamValue AS APV_Priority ON (Item_backlog.Priority_Id=APV_Priority.appParamValueId) 
     INNER JOIN 
      Item_backlog_group AS Item_backlog_Group ON (Item_backlog.backlog_group_id=Item_backlog_Group.backlog_group_id) 
     WHERE', Var_status_id, Var_category_id); 

     PREPARE stmt FROM @SQL; 
     EXECUTE stmt; 

END$$ 

DELIMITER ; 

Answer 2

假設您有一個指定參數未指定的定義值（例如，我已經使用下面的NULL來指示參數未提供），您可以執行的操作是有條件地應用參數。

CREATE PROCEDURE `FilterRecord`(IN i_status_id BIGINT,IN i_category_id BIGINT) 
BEGIN 
    SELECT 
      Item_backlog.backlog_id AS backlog_id, 
      -- ... 
     FROM 
      Item_backlog 
     INNER JOIN  
      -- .. 
     WHERE 
      (Item_backlog.status_id=i_status_id OR i_status_id IS NULL) 
     AND 
      (Item_backlog.category_id=i_category_id OR i_category_id IS NULL); 
END 

但請注意，這樣做的性能可能會降低。

SqlFiddle example here - 我假設MySql，順便說一句，根據您的主標籤和反引號。