在DB2 Store過程中使用IF語句

Question

如何使用IF和ELSE語句來定義要根據「深度INTEGER」運行多少存儲過程？ （例如，如果用戶使用1所述的深度周長，僅第一部分將被加工的）

--#SET TERMINATOR/

CREATE PROCEDURE STOREP2(IN str_in VARCHAR(1), IN depth INTEGER) 
        LANGUAGE SQL MODIFIES SQL DATA 
        DYNAMIC RESULT SETS 1 


CRSUBJ: BEGIN 

DECLARE C1 CURSOR WITH RETURN FOR 

SELECT T1.COLUMN1, T1.COLUMN2 FROM TABLE1 AS T1 WHERE T1.COLUMN1=str_in 

UNION 

SELECT T2.COLUMN1, T2.COLUMN2 FROM TABLE1 AS T1, TABLE1 AS T2 WHERE T1.COLUMN1=str_in AND T2.COLUMN1=T1.COLUMN2 

UNION 

SELECT T3.COLUMN1, T3.COLUMN2 FROM TABLE1 AS T1, TABLE1 AS T2, TABLE1 AS T3 WHERE T1.COLUMN1=str_in AND T2.COLUMN1=T1.COLUMN2 AND T3.COLUMN1=T2.COLUMN2 

UNION 

SELECT T4.COLUMN1, T4.COLUMN2 FROM TABLE1 AS T1, TABLE1 AS T2, TABLE1 AS T3, TABLE1 AS T4 WHERE T1.COLUMN1=str_in AND T2.COLUMN1=T1.COLUMN2 AND T3.COLUMN1=T2.COLUMN2 AND T4.COLUMN1=T3.COLUMN2; 

OPEN C1; 
RETURN; 

END CRSUBJ/ 

謝謝:)

Answer 1

更具體地：在你的示例 - 可以」噸。你有效地執行的是對TABLE1的四個查詢並將返回的結果光標返回給調用者顯示爲一個表。這將有助於瞭解更多的表格結構以及您試圖達到的目標，以幫助您解決問題。

Answer 2

Check documentation.