在 SQL Server 2005 中即时查找主键约束 [英] Finding a Primary Key Constraint on the fly in SQL Server 2005

问题描述

我有以下 SQL:

 ALTER TABLE dbo.PS_userVariables DROP CONSTRAINT PK_PS_userVariables;
 ALTER TABLE dbo.PS_userVariables ADD PRIMARY KEY (varnumber, subjectID, userID, datasetID, listid, userVarTitle);

由于我有多个环境，PK_PS_userVariables 约束名称在我的不同数据库上是不同的.如何编写一个获得该名称的脚本，然后将其添加到我的脚本中?

Since I have multiple environments, that PK_PS_userVariables constraint name is different on my different databases. How do I write a script that gets that name then adds it into my script?

推荐答案

虽然典型的最佳实践是始终明确命名约束，但您可以从目录视图中动态获取它们:

While the typical best practice is to always explicitly name your constraints, you can get them dynamically from the catalog views:

DECLARE @table NVARCHAR(512), @sql NVARCHAR(MAX);

SELECT @table = N'dbo.PS_userVariables';

SELECT @sql = 'ALTER TABLE ' + @table 
    + ' DROP CONSTRAINT ' + name + ';'
    FROM sys.key_constraints
    WHERE [type] = 'PK'
    AND [parent_object_id] = OBJECT_ID(@table);

EXEC sp_executeSQL @sql;

ALTER TABLE dbo.PS_userVariables ADD CONSTRAINT ...

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