sql - SQL Server DDL脚本为数据库中的每个表附加（或删除）相同的列集？

Question

如何编写一个 sql server DDL 脚本，它可以：

对于数据库中的每个表：

add column CreatedBy
add column CreateDate
add column UpdatedBy
add column UpdatedDate

此外，如果特定列已存在于表中，则跳过该列。

此外，它的反面，对于每个表，删除这 4 列。

Answer 1

DECLARE @TableName NVARCHAR(128)

DECLARE curTables CURSOR FAST_FORWARD FOR
SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES

OPEN curTables

FETCH NEXT FROM curTables INTO @TableName

WHILE (@@FETCH_STATUS = 0)
    BEGIN
        IF NOT EXISTS(SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME=@TableName AND COLUMN_NAME='CreatedBy')
            EXECUTE ('ALTER TABLE [' + @TableName + '] ADD CreatedBy VARCHAR(50)')

        IF NOT EXISTS(SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME=@TableName AND COLUMN_NAME='CreatedDate')
            EXECUTE ('ALTER TABLE [' + @TableName + '] ADD CreatedDate DATETIME')

        IF NOT EXISTS(SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME=@TableName AND COLUMN_NAME='UpdatedBy')
            EXECUTE ('ALTER TABLE [' + @TableName + '] ADD UpdatedBy VARCHAR(50)')

        IF NOT EXISTS(SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME=@TableName AND COLUMN_NAME='UpdatedDate')
            EXECUTE ('ALTER TABLE [' + @TableName + '] ADD UpdatedDate DATETIME')


        FETCH NEXT FROM curTables INTO @TableName   
    END

CLOSE curTables
DEALLOCATE curTables

然后相反的只是更改IF NOT EXISTS为IF EXISTS和 ALTER 语句的情况ALTER TABLE...DROP [ColumnName]

Answer 2

很棒的样本，AdaTheDev！但是，我对其进行了小改动，以忽略各种模式、视图和 aspnet 成员表中的表。如果您只想处理特定模式中的表，您可以轻松更改它。

这是我的版本：

DECLARE @TableName NVARCHAR(128)
DECLARE @TableSchema NVARCHAR(128)

DECLARE curTables CURSOR FAST_FORWARD FOR
select TABLE_SCHEMA, TABLE_NAME from INFORMATION_SCHEMA.TABLES where TABLE_TYPE='BASE TABLE' and (TABLE_SCHEMA not in ('schems1', 'schems2') and  TABLE_NAME not like 'aspnet_%')
OPEN curTables

FETCH NEXT FROM curTables INTO @TableSchema, @TableName

WHILE (@@FETCH_STATUS = 0)
    BEGIN
        IF NOT EXISTS(SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME=@TableName AND COLUMN_NAME='Locked')
            EXECUTE ('ALTER TABLE  [' + @TableSchema + '].[' + @TableName + '] ADD Locked bit NOT NULL CONSTRAINT DF_' + @TableSchema + '_' + @TableName + '_Locked DEFAULT 0')

        FETCH NEXT FROM curTables INTO @TableSchema, @TableName
    END

CLOSE curTables
DEALLOCATE curTables