如何在创建存储过程之前检查PERVASIVE数据库中是否存在存储过程?

时间:2016-05-09 18:15:36

标签: stored-procedures exists pervasive-sql

我想在Pervasive数据库中创建一个存储过程,但前提是它尚不存在。

我找到了适合SQL Server的东西:

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

我在此链接上找到了代码How to check if a stored procedure exists before creating it

所以我想要一些与Pervasive非常相似的东西。

1 个答案:

答案 0 :(得分:1)

无法在Pervasive中的存储过程之外执行IF NOT EXISTS语法。您可以创建一个采用过程名称的过程,如果存在则将其删除。类似的东西:

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')#

所以你的SQL会是这样的:

call DropProcIfExists('MyNewProc')#
Create Procedure MyNewProc()
AS
BEGIN...