我写出了我的SQL并遇到问题,请参见here。SQL Server 2000 - 我该怎么写这个脚本?
因此,我要求正确的方法来做我想做的事情,因为我认为这是使用EXEC的黑客行为。如果EXEC是正确的方式,那么我有SQL的问题,但会使用它。
我正在写一个SQL脚本来创建/更新数据库。我有它的结构像这样:
Declare SafetyCheck=0
Declare DBVersion=0
Declare NewInstall=0
Declare DropTables=0
IF SafetyCheck=1
Begin
IF DropTables = 1
Drop all tables in the database
IF Config table doesn't exist
Begin
Create the Config Table
NewInstall = 1
End
IF Other Table doesn't exist
Create the other table
IF Other Table doesn't exist
Create the other table
DBVersion = CheckTheDBVersion
IF DBVersion is old
Begin
Alter tables to make them +1 version higher
Insert some stuff
End
DBVersion = CheckTheDBVersion
IF DBVersion is old
Begin
Alter tables to make them +1 version higher
Insert some stuff
End
IF NewInstall = 1
Begin
Insert default data
End
End
按道理上面应该工作,但它没有我喜欢上面的问题,因为。据我所知,我有EXEC或GO选项。正如上面所说的,EXEC,我认为是一种破解。它执行一个字符串作为SQL,但我没有以动态的方式使用它,我有静态SQL坐在它 - 只是似乎错了我。据我所知,GO会将所有内容都打破,因为它会重置变量。
我现在可以选择重写SQL,所以如果我能以正确的方式做到这一点,我会的。我只是不知道我猜的正确方法。
EDIT(示例脚本似乎是工作):
我不得不分手上面,因为我不能把一个GO一个IF语句内的样品中的SafetyCheck检查。这使得它更难看。
-- -- --
-- Run this once to create the initial tables
-- -- --
CREATE TABLE Config (
ID [int] IDENTITY(1,1) NOT NULL,
[Key] [nvarchar](255) NOT NULL,
Value [nvarchar](255) NOT NULL
)
ALTER TABLE Config ADD PRIMARY KEY (ID)
CREATE TABLE Roles (
ID [int] IDENTITY(1,1) NOT NULL,
Name [nvarchar](25) NOT NULL,
Created [DateTime] NOT NULL
)
ALTER TABLE Roles ADD PRIMARY KEY (ID)
-- -- --
-- Below, this is the script thats causing errors
-- -- --
IF EXISTS(SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = '#v')
DROP TABLE #v
CREATE TABLE #v (n char(30),v char(30))
INSERT INTO #v (n,v) VALUES ('RunSQL', '1') -- Set to 1 or this does nothing
INSERT INTO #v (n,v) VALUES ('DropTables', '0') -- Set to 1 to drop existing tables
-- dont do this for an upgrade
-- dont do this is there are custom tables
GO
IF (SELECT v FROM #v WHERE n='RunSQL') = 0
BEGIN
SELECT 'Nothing has been done. Read First, Run Later' AS Error
END
IF (SELECT v FROM #v WHERE n='RunSQL') = 1
BEGIN
IF (SELECT v FROM #v WHERE n='DropTables') = 1
BEGIN
-- Remove all tables if they exist
EXEC sp_MSforeachtable @command1 = 'DROP TABLE ?'
END
END
GO
IF (SELECT v FROM #v WHERE n='RunSQL') = 1
BEGIN
IF NOT EXISTS(SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = 'Config')
BEGIN
CREATE TABLE Config (
ID [int] IDENTITY(1,1) NOT NULL,
[Key] [nvarchar](255) NOT NULL,
Value [nvarchar](255) NOT NULL
)
ALTER TABLE Config ADD PRIMARY KEY (ID)
-- Assume this is a new database
INSERT INTO Config ([Key], Value) VALUES ('DBVersion', '3')
END
IF NOT EXISTS(SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = 'Roles')
BEGIN
CREATE TABLE Roles (
ID [int] IDENTITY(1,1) NOT NULL,
Name [nvarchar](25) NOT NULL,
Created [DateTime] NOT NULL,
ModifiedDate [DateTime] NOT NULL
)
ALTER TABLE Roles ADD PRIMARY KEY (ID)
END
END
GO
-- Lookup the current verision of the database
IF (SELECT v FROM #v WHERE n='RunSQL') = 1
BEGIN
INSERT INTO #v (n,v) SELECT 'CMSDBVersion', Value FROM Config WHERE [Key]='DBVersion'
END
GO
-- Update old tables to be like the new ones
IF (SELECT v FROM #v WHERE n='RunSQL') = 1
BEGIN
IF (SELECT COUNT(v) FROM #v WHERE n='CMSDBVersion') = 0
BEGIN
-- Add newer fields to exiting tables
ALTER TABLE Roles ADD ModifiedDate DateTime;
INSERT INTO Config ([Key], Value) Values ('DBVersion', '3')
END
END
IF (SELECT v FROM #v WHERE n='RunSQL') = 1
BEGIN
INSERT INTO #v (n,v) SELECT 'CMSDBVersion', Value FROM Config WHERE [Key]='DBVersion'
END
GO
IF (SELECT v FROM #v WHERE n='RunSQL') = 1
BEGIN
IF (SELECT v FROM #v WHERE n='CMSDBVersion') = '3'
BEGIN
-- Add/Update the standard rules
IF NOT EXISTS (SELECT * FROM Roles WHERE Name='CMS User Admin')
INSERT INTO Roles (Name, Created, ModifiedDate) VALUES ('CMS User Admin', GETDATE(), GETDATE())
END
END
GO
-- remove the temp table
DROP TABLE #v
@marc_S - thanks,fixed – Justin808 2011-01-31 21:51:41