FirebirdSQL/3/Store Procedure

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存储过程是什么

預存程序(Stored Procedure)(簡稱SP)是使用者預先寫好的資料庫Script。

SP最大好處是可以降低資料在網路來回傳送與網路負載，因為我們將處理資料的程式碼寫在伺服器端，那麼客戶端將只會收到經過處理後的紀錄，如此資料庫伺服器效能會大大的提升．

存储过程(Stored Procedure)相关語法

• 存储过程(Stored Procedure)创建的語法：

CREATE PROCEDURE name
[( param datatype [, param datatype …])]
[RETURNS ( param datatype [, param datatype …])]
AS
<procedure_body>;
<procedure_body> = [<variable_declaration_list>]
<block>
<variable_declaration_list> =
DECLARE VARIABLE var datatype;
[DECLARE VARIABLE var datatype; …]
<block> =
BEGIN
< compound_statement>
[< compound_statement> …]
END
<compound_statement> = {<block> | statement;}

• Stored Procedure 修改的語法：

ALTER PROCEDURE name
[( var datatype [, var datatype …])]
[RETURNS ( var datatype [, var datatype …])]
AS
procedure_body;

• Stored Procedure 移除的語法：

DROP PROCEDURE name;

Stored Procedure 範例

• Stored Procedure 建立的語法：
• Stored Procedure 修改的語法：
• Stored Procedure 移除的語法：

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