Question

我正在创建一个基本的ORM（纯粹是为了好玩），并且想知道，有没有办法返回数据库中的表列表以及每个表的字段？

使用这个，我希望能够遍历结果集（在C＃中），然后对结果集中的每个表说，执行此操作（例如，使用反射来创建一个将执行或包含xyz的类）。

除此之外，SQL Server的一些优秀在线博客是什么？我知道这个问题实际上是关于在Sql Server中使用系统SP和数据库，我对一般查询没问题，所以我对一些涵盖这种功能的博客感兴趣。

由于

Answer 1

这就是你要找的东西：

使用OBJECT CATALOG VIEWS

 SELECT T.name AS Table_Name ,
       C.name AS Column_Name ,
       P.name AS Data_Type ,
       P.max_length AS Size ,
       CAST(P.precision AS VARCHAR) + '/' + CAST(P.scale AS VARCHAR) AS Precision_Scale
FROM   sys.objects AS T
       JOIN sys.columns AS C ON T.object_id = C.object_id
       JOIN sys.types AS P ON C.system_type_id = P.system_type_id
WHERE  T.type_desc = 'USER_TABLE';

使用信息模式视图

  SELECT TABLE_SCHEMA ,
       TABLE_NAME ,
       COLUMN_NAME ,
       ORDINAL_POSITION ,
       COLUMN_DEFAULT ,
       DATA_TYPE ,
       CHARACTER_MAXIMUM_LENGTH ,
       NUMERIC_PRECISION ,
       NUMERIC_PRECISION_RADIX ,
       NUMERIC_SCALE ,
       DATETIME_PRECISION
FROM   INFORMATION_SCHEMA.COLUMNS;

参考：我的博客 - http://dbalink.wordpress.com/2008/10/24/querying-the-object-catalog-and-information-schema-views/

Answer 2

Tables ::

SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE='BASE TABLE'

columns ::

SELECT * FROM INFORMATION_SCHEMA.COLUMNS

或

SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME='your_table_name'

Answer 3

获取所有表格和数据库中的字段列表：

Select *
From INFORMATION_SCHEMA.COLUMNS
Where TABLE_CATALOG Like 'DatabaseName'

获取表格中所有字段的列表：

Select *
From INFORMATION_SCHEMA.COLUMNS
Where TABLE_CATALOG Like 'DatabaseName' And TABLE_NAME Like 'TableName'

Answer 4

SELECT * FROM INFORMATION_SCHEMA.COLUMNS

Answer 5

我测试了一些找到的解决方案

Select *
From INFORMATION_SCHEMA.COLUMNS

为您提供CURRENT /默认数据库的列信息。

Select *
From <DBNAME>.INFORMATION_SCHEMA.COLUMNS

，没有＆lt;和＆gt;，为您提供数据库DBNAME的列信息。

Answer 6

你这里的其他内置朋友是系统sproc SP_HELP。

示例用法::

sp_help <MyTableName>

它返回的信息比您真正需要的信息多得多，但至少有90％的可能要求可以满足。

Answer 7

把它扔出去 - 现在很容易复制/粘贴到word或google doc：

PRINT '<html><body>'
SET NOCOUNT ON
DECLARE @tableName VARCHAR(30)
DECLARE tableCursor CURSOR LOCAL FAST_FORWARD FOR
    SELECT T.name AS TableName 
      FROM sys.objects AS T
     WHERE T.type_desc = 'USER_TABLE'
     ORDER BY T.name
OPEN tableCursor
FETCH NEXT FROM tableCursor INTO @tableName
WHILE @@FETCH_STATUS = 0 BEGIN
    PRINT '<h2>' + @tableName + '</h2>'
    PRINT '<pre>'
    SELECT LEFT(C.name, 30) AS ColumnName,
           LEFT(ISC.DATA_TYPE, 10) AS DataType,
           C.max_length AS Size,
           CAST(P.precision AS VARCHAR(4)) + '/' + CAST(P.scale AS VARCHAR(4)) AS PrecScale,
           CASE WHEN C.is_nullable = 1 THEN 'Null' ELSE 'No Null' END AS [Nullable],
           LEFT(ISNULL(ISC.COLUMN_DEFAULT, ' '), 5)  AS [Default],
           CASE WHEN C.is_identity = 1 THEN 'Identity' ELSE '' END AS [Identity]
    FROM   sys.objects AS T
           JOIN sys.columns AS C ON T.object_id = C.object_id
           JOIN sys.types AS P ON C.system_type_id = P.system_type_id
           JOIN INFORMATION_SCHEMA.COLUMNS AS ISC ON T.name = ISC.TABLE_NAME AND C.name = ISC.COLUMN_NAME
    WHERE  T.type_desc = 'USER_TABLE'
      AND  T.name = @tableName
    ORDER BY T.name, ISC.ORDINAL_POSITION
    PRINT '</pre>'
    FETCH NEXT FROM tableCursor INTO @tableName

END

CLOSE tableCursor
DEALLOCATE tableCursor
SET NOCOUNT OFF
PRINT '</body></html>'

Answer 8

这将为您提供所有用户创建的表格：

select * from sysobjects where xtype='U'

获得cols：

Select * from Information_Schema.Columns Where Table_Name = 'Insert Table Name Here'

另外，我发现http://www.sqlservercentral.com/是一个非常好的数据库资源。

Answer 9

对于MYSQL：

Select *
From INFORMATION_SCHEMA.COLUMNS
where TABLE_SCHEMA = "<DatabaseName>"

Answer 10

这将返回数据库名称，表名，列名和数据库参数指定的列的数据类型：

declare @database nvarchar(25)
set @database = ''

SELECT cu.table_catalog,cu.VIEW_SCHEMA, cu.VIEW_NAME, cu.TABLE_NAME,   
cu.COLUMN_NAME,c.DATA_TYPE,c.character_maximum_length
from INFORMATION_SCHEMA.VIEW_COLUMN_USAGE as cu
JOIN INFORMATION_SCHEMA.COLUMNS as c
on cu.TABLE_SCHEMA = c.TABLE_SCHEMA and c.TABLE_CATALOG = 
cu.TABLE_CATALOG
and c.TABLE_NAME = cu.TABLE_NAME
and c.COLUMN_NAME = cu.COLUMN_NAME
where cu.TABLE_CATALOG = @database
order by cu.view_name,c.COLUMN_NAME

Answer 11

我找到了一种使用SQL开发人员获取特定数据库的表和列的详细信息的简单方法。

Select *FROM USER_TAB_COLUMNS

Answer 12

SELECT * FROM INFORMATION_SCHEMA.COLUMNS获取所有

SELECT TABLE_NAME FROM INFORMATION_SCHEMA.COLUMNS获取所有表名。在sqlserver上试试，

Answer 13

在Microsoft SQL Server中，您可以使用此功能：

declare @sql2 nvarchar(2000)
        set @sql2  ='
use ?
if (  db_name(db_id()) not in (''master'',''tempdb'',''model'',''msdb'',''SSISDB'')  )
begin   

select
    db_name() as db,
    SS.name as schemaname,
    SO.name tablename,
    SC.name columnname,
    ST.name type,
    case when ST.name in (''nvarchar'', ''nchar'')
        then convert(varchar(10), ( SC.max_length / 2 ))
        when ST.name in (''char'', ''varchar'')
        then convert(varchar(10), SC.max_length)
        else null
    end as length,
    case when SC.is_nullable = 0 then ''No'' when SC.is_nullable = 1 then ''Yes'' else null end as nullable,
    isnull(SC.column_id,0) as col_number
from sys.objects                  SO
join sys.schemas                  SS
    on SS.schema_id = SO.schema_id
join sys.columns             SC
on SO.object_id     = SC.object_id
left join sys.types               ST
    on SC.user_type_id = ST.user_type_id and SC.system_type_id = ST.system_type_id
    where SO.is_ms_shipped = 0 
end
'

exec sp_msforeachdb @command1 = @sql2

这将显示所有用户定义的数据库中的所有表和列（及其定义）。

获取数据库中的表和每个字段的列表

13 个答案: