如何以编程方式确定哪些 SQL 表具有标识列

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【中文标题】如何以编程方式确定哪些 SQL 表具有标识列【英文标题】:How do you determine what SQL Tables have an identity column programmatically 【发布时间】:2010-09-10 09:45:18 【问题描述】:

我想在 SQL Server 2005 中创建一个列列表,这些列在 T-SQL 中具有标识列及其对应的表。

结果会是这样的:

表名、列名

【问题讨论】:

【参考方案1】:

对 SQL Server 执行此操作的另一种可能方法是使用 INFORMATION_SCHEMA 浏览量:

select COLUMN_NAME, TABLE_NAME
from INFORMATION_SCHEMA.COLUMNS
where COLUMNPROPERTY(object_id(TABLE_SCHEMA+'.'+TABLE_NAME), COLUMN_NAME, 'IsIdentity') = 1
order by TABLE_NAME 

【讨论】:

注意一个问题是您可以指定 [db name].information_schema.columns ,但从不同的数据库运行...然后 COLUMNPROPERTY 针对错误的数据库运行 当你有其他模式时,这种方式会更好: where COLUMNPROPERTY(object_id(TABLE_SCHEMA+'.'+TABLE_NAME)... 我认为这个答案不适用于 Microsoft SQL Server 2014。 如果您正在寻找一种从 SQL Server 2000 开始工作的简单方法,请查看 @Guillermo 的 this answer。 INFORMATION_SCHEMA.COLUMNS 包含普通表和 视图 的信息,我建议添加 TABLE_TYPE(加入 INFORMATION_SCHEMA.TABLES)以提高结果集的可读性。【参考方案2】:

sys.columns.is_identity = 1

例如,

select o.name, c.name
from sys.objects o inner join sys.columns c on o.object_id = c.object_id
where c.is_identity = 1

【讨论】:

注意:这适用于我在 SQL 2008 中,而接受的答案不适用(问题要求 SQL 2005)。 此答案也适用于 Microsoft SQL Server 2014。【参考方案3】:

另一种方式(2000 / 2005/2012/2014):

IF ((SELECT OBJECTPROPERTY( OBJECT_ID(N'table_name_here'), 'TableHasIdentity')) = 1)
    PRINT 'Yes'
ELSE
    PRINT 'No'

注意:table_name_here 应该是 schema.table,除非架构是 dbo

【讨论】:

【参考方案4】:

在 SQL 2005 中:

select object_name(object_id), name
from sys.columns
where is_identity = 1

【讨论】:

【参考方案5】:

这个查询似乎可以解决问题:

SELECT 
    sys.objects.name AS table_name, 
    sys.columns.name AS column_name
FROM sys.columns JOIN sys.objects 
    ON sys.columns.object_id=sys.objects.object_id
WHERE 
    sys.columns.is_identity=1
    AND
    sys.objects.type in (N'U')

【讨论】:

【参考方案6】:

基于Guillermo答案的没有Identity列的表列表:

SELECT DISTINCT TABLE_NAME
FROM            INFORMATION_SCHEMA.COLUMNS
WHERE        (TABLE_SCHEMA = 'dbo') AND (OBJECTPROPERTY(OBJECT_ID(TABLE_NAME), 'TableHasIdentity') = 0)
ORDER BY TABLE_NAME

【讨论】:

【参考方案7】:

这是 MSSQL 2000 的工作版本。我已修改此处找到的 2005 代码:http://sqlfool.com/2011/01/identity-columns-are-you-nearing-the-limits/

/* Define how close we are to the value limit
   before we start throwing up the red flag.
   The higher the value, the closer to the limit. */
DECLARE @threshold DECIMAL(3,2);
SET @threshold = .85;

/* Create a temp table */
CREATE TABLE #identityStatus
(
      database_name     VARCHAR(128)
    , table_name        VARCHAR(128)
    , column_name       VARCHAR(128)
    , data_type         VARCHAR(128)
    , last_value        BIGINT
    , max_value         BIGINT
);

DECLARE @dbname sysname;
DECLARE @sql nvarchar(4000);

-- Use an cursor to iterate through the databases since in 2000 there's no sp_MSForEachDB command...

DECLARE c cursor FAST_FORWARD FOR
SELECT
    name
FROM
    master.dbo.sysdatabases 
WHERE 
    name NOT IN('master', 'model', 'msdb', 'tempdb');

OPEN c;

FETCH NEXT FROM c INTO @dbname;

WHILE @@FETCH_STATUS = 0
BEGIN
    SET @sql = N'Use [' + @dbname + '];
    Insert Into #identityStatus
    Select ''' + @dbname + ''' As [database_name]
        , Object_Name(id.id) As [table_name]
        , id.name As [column_name]
        , t.name As [data_type]
        , IDENT_CURRENT(Object_Name(id.id)) As [last_value]
        , Case 
            When t.name = ''tinyint''   Then 255 
            When t.name = ''smallint''  Then 32767 
            When t.name = ''int''       Then 2147483647 
            When t.name = ''bigint''    Then 9223372036854775807
          End As [max_value]
    From 
        syscolumns As id
        Join systypes As t On id.xtype = t.xtype
    Where 
        id.colstat&1 = 1    -- this identifies the identity columns (as far as I know)
    ';

    EXECUTE sp_executesql @sql;

    FETCH NEXT FROM c INTO @dbname;
END

CLOSE c;
DEALLOCATE c;

/* Retrieve our results and format it all prettily */
SELECT database_name
    , table_name
    , column_name
    , data_type
    , last_value
    , CASE 
        WHEN last_value < 0 THEN 100
        ELSE (1 - CAST(last_value AS FLOAT(4)) / max_value) * 100 
      END AS [percentLeft]
    , CASE 
        WHEN CAST(last_value AS FLOAT(4)) / max_value >= @threshold
            THEN 'warning: approaching max limit'
        ELSE 'okay'
        END AS [id_status]
FROM #identityStatus
ORDER BY percentLeft;

/* Clean up after ourselves */
DROP TABLE #identityStatus;

【讨论】:

【参考方案8】:

以下查询对我有用:

select  TABLE_NAME tabla,COLUMN_NAME columna
from    INFORMATION_SCHEMA.COLUMNS
where   COLUMNPROPERTY(object_id(TABLE_SCHEMA+'.'+TABLE_NAME), COLUMN_NAME, 'IsIdentity') = 1
order by TABLE_NAME

【讨论】:

【参考方案9】:

我认为这适用于 SQL 2000:

SELECT 
    CASE WHEN C.autoval IS NOT NULL THEN
        'Identity'
    ELSE
        'Not Identity'
    AND
FROM
    sysobjects O
INNER JOIN
    syscolumns C
ON
    O.id = C.id
WHERE
    O.NAME = @TableName
AND
    C.NAME = @ColumnName

【讨论】:

我不知道 autoval 是做什么的,但我的所有身份字段都是 NULL。我拥有的 SQL 2000 代码是 colstat & 1 = 1 我不确定该代码来自哪里(大约有 5 年的历史),但我的评论说位掩码是必要的。但是 colstat = 1 代表我的身份。 hmm... 我使用 status & 128 = 128 来确定我的身份:-P【参考方案10】:

这对我使用 Sql Server 2008 有效:

USE <database_name>;
GO
SELECT SCHEMA_NAME(schema_id) AS schema_name
    , t.name AS table_name
    , c.name AS column_name
FROM sys.tables AS t
JOIN sys.identity_columns c ON t.object_id = c.object_id
ORDER BY schema_name, table_name;
GO

【讨论】:

【参考方案11】:

使用这个:

DECLARE @Table_Name VARCHAR(100) 
DECLARE @Column_Name VARCHAR(100)
SET @Table_Name = ''
SET @Column_Name = ''

SELECT  RowNumber = ROW_NUMBER() OVER ( PARTITION BY T.[Name] ORDER BY T.[Name], C.column_id ) ,
    SCHEMA_NAME(T.schema_id) AS SchemaName ,
    T.[Name] AS Table_Name ,
    C.[Name] AS Field_Name ,
    sysType.name ,
    C.max_length ,
    C.is_nullable ,
    C.is_identity ,
    C.scale ,
    C.precision
FROM    Sys.Tables AS T
    LEFT JOIN Sys.Columns AS C ON ( T.[Object_Id] = C.[Object_Id] )
    LEFT JOIN sys.types AS sysType ON ( C.user_type_id = sysType.user_type_id )
WHERE   ( Type = 'U' )
    AND ( C.Name LIKE '%' + @Column_Name + '%' )
    AND ( T.Name LIKE '%' + @Table_Name + '%' )
ORDER BY T.[Name] ,
    C.column_id

【讨论】:

【参考方案12】:

这适用于 SQL Server 2005、2008 和 2012。 我发现 sys.identity_columns 没有包含我所有带有标识列的表。

SELECT a.name AS TableName, b.name AS IdentityColumn
FROM sys.sysobjects a 
JOIN sys.syscolumns b 
ON a.id = b.id
WHERE is_identity = 1
ORDER BY name;

查看文档页面,也可以使用状态列。您还可以添加四部分标识符,它将在不同的服务器上工作。

SELECT a.name AS TableName, b.name AS IdentityColumn
FROM [YOUR_SERVER_NAME].[YOUR_DB_NAME].sys.sysobjects a 
JOIN [YOUR_SERVER_NAME].[YOUR_DB_NAME].sys.syscolumns b 
ON a.id = b.id
WHERE is_identity = 1
ORDER BY name;

来源: https://msdn.microsoft.com/en-us/library/ms186816.aspx

【讨论】:

【参考方案13】:

由于某种原因,sql server 在不同的表中保存了一些标识列,对我有用的代码如下:

select      TABLE_NAME tabla,COLUMN_NAME columna
from        INFORMATION_SCHEMA.COLUMNS
where       COLUMNPROPERTY(object_id(TABLE_SCHEMA+'.'+TABLE_NAME), COLUMN_NAME, 'IsIdentity') = 1
union all
select      o.name tabla, c.name columna
from        sys.objects o 
inner join  sys.columns c on o.object_id = c.object_id
where       c.is_identity = 1

【讨论】:

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