SQL--比较两个数据库的表结构

USE Test_1
DECLARE @tableCount INT
SELECT @tableCount = COUNT(1) FROM [sysobjects] WHERE [xtype] = 'U'
--将此数据库中的所有表名插入到临时表中
SELECT IDENTITY(INT,1,1) AS ID, [name] INTO #TmpTable FROM [sysobjects] WHERE [xtype] = 'U' ORDER BY [name]
--SELECT * FROM #TmpTable

DECLARE @tableName VARCHAR(100)
DECLARE @tableIndex INT
SET @tableIndex = 1
WHILE @tableIndex <= @tableCount
BEGIN
SELECT @tableName = Name FROM #TmpTable WHERE ID = @tableIndex
SET @tableIndex = @tableIndex + 1
--测试库
USE Test_1
SELECT
SO.[name] AS TableName
,SC.[name] AS ColumnName
,ST.[name] AS ColumnType
,COLUMNPROPERTY(SC.[id], SC.[name], 'PRECISION') AS ColumnLength
,CASE SC.[isnullable]
WHEN 1 THEN '√'
ELSE ''
END AS IsAllowNull
,ISNULL(SCM.text, '') AS DefaultValue
INTO #TmpTable1
FROM [syscolumns] SC
JOIN [sysobjects] SO ON SO.id = SC.id AND SO.[xtype] = 'U'
LEFT JOIN [systypes] ST ON ST.[xusertype] = SC.[xtype]
LEFT JOIN [syscomments] SCM ON SCM.[id] = SC.[cdefault]
WHERE SO.[name] = @tableName
ORDER BY SC.[colid]
--正式库
USE Test_2
SELECT
SC.[name] AS ColumnName
,ST.[name] AS ColumnType
,COLUMNPROPERTY(SC.[id], SC.[name], 'PRECISION') AS ColumnLength
,CASE SC.[isnullable]
WHEN 1 THEN '√'
ELSE ''
END AS IsAllowNull
,ISNULL(SCM.text, '') AS DefaultValue
INTO #TmpTable2
FROM [syscolumns] SC
JOIN [sysobjects] SO ON SO.id = SC.id AND SO.[xtype] = 'U'
LEFT JOIN [systypes] ST ON ST.[xusertype] = SC.[xtype]
LEFT JOIN [syscomments] SCM ON SCM.[id] = SC.[cdefault]
WHERE SO.[name] = @tableName
ORDER BY SC.[colid]

IF EXISTS (
SELECT * FROM #TmpTable1 A
FULL OUTER JOIN #TmpTable2 B ON A.ColumnName = B.ColumnName
WHERE A.ColumnName <> B.ColumnName OR A.ColumnType <> B.ColumnType OR A.ColumnLength <> B.ColumnLength OR A.IsAllowNull <> B.IsAllowNull OR A.DefaultValue <> B.DefaultValue OR A.ColumnName IS NULL OR B.ColumnName IS NULL
)
SELECT * FROM #TmpTable1 A
FULL OUTER JOIN #TmpTable2 B ON A.ColumnName = B.ColumnName
WHERE A.ColumnName <> B.ColumnName OR A.ColumnType <> B.ColumnType OR A.ColumnLength <> B.ColumnLength OR A.IsAllowNull <> B.IsAllowNull OR A.DefaultValue <> B.DefaultValue OR A.ColumnName IS NULL OR B.ColumnName IS NULL

DROP TABLE #TmpTable1
DROP TABLE #TmpTable2
END

DROP TABLE #TmpTable