[英]How can I check if a stored procedure exists in PERVASIVE database before creating it?
I want to create a stored procedure in a Pervasive database, but only if it does not yet exist. 我想在Pervasive数据库中创建一个存储过程,但前提是该存储过程尚不存在。
I found something for SQL Server: 我为SQL Server找到了一些东西:
IF NOT EXISTS (SELECT *
FROM sys.objects
WHERE type = 'P' AND OBJECT_ID = OBJECT_ID('dbo.MyProc'))
exec('CREATE PROCEDURE [dbo].[MyProc] AS BEGIN SET NOCOUNT ON; END')
GO
I found that code on this link How to check if a stored procedure exists before creating it . 我在此链接上找到了该代码。 如何在创建存储过程之前检查它是否存在 。
So I want something really similar for Pervasive. 因此,我希望Pervasive拥有与之相似的东西。
There's no way to execute the IF NOT EXISTS
syntax outside of a Stored Procedure in Pervasive. 在Pervasive中,无法在存储过程之外执行IF NOT EXISTS
语法。 You could create a procedure taking a procedure name and drop it if it exist. 您可以创建一个使用过程名称的过程,并删除该过程名称(如果存在)。 Something like: 就像是:
CREATE PROCEDURE DropProcIfExists(in :procname char(20))
AS
BEGIN
IF( EXISTS (SELECT xp$Name FROM X$proc WHERE Xp$Name = :procname) ) THEN
Exec('DROP Procedure "' + :procname + '"') ;
END IF;
End#
call DropProcIfExists ('myProc')#
So your SQL would be something like: 因此,您的SQL类似于:
call DropProcIfExists('MyNewProc')#
Create Procedure MyNewProc()
AS
BEGIN...
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