1.获取表的基本字段属性
--获取SqlServer中表结构
SELECTsyscolumns.name,systypes.name,syscolumns.isnullable,
syscolumns.length
FROMsyscolumns,systypes
WHEREsyscolumns.xusertype=systypes.xusertype
ANDsyscolumns.id=object_id('你的表名')
2.获取字段的描述信息
--获取SqlServer中表结构主键，及描述
declare@table_nameasvarchar(max)
set@table_name='你的表名'
selectsys.columns.name,sys.types.name,sys.columns.max_length,sys.columns.is_nullable,
(selectcount(*)fromsys.identity_columnswheresys.identity_columns.object_id=sys.columns.object_idandsys.columns.column_id=sys.identity_columns.column_id)asis_identity,
(selectvaluefromsys.extended_propertieswheresys.extended_properties.major_id=sys.columns.object_idandsys.extended_properties.minor_id=sys.columns.column_id)asdescription
fromsys.columns,sys.tables,sys.typeswheresys.columns.object_id=sys.tables.object_idandsys.columns.system_type_id=sys.types.system_type_idandsys.tables.name=@table_nameorderbysys.columns.column_id
3.单独查询表的递增字段
--单独查询表递增字段
select[name]fromsyscolumnswhere
id=object_id(N'你的表名')andCOLUMNPROPERTY(id,name,'IsIdentity')=1
4.获取表的主外键
--获取表主外键约束
execsp_helpconstraint'你的表名';
5.相当完整的表结构查询
--很全面的表结构
execsp_helpconstraint'你的表名';
SELECT 表名 = CASE a.colorder WHEN 1 THEN c.name ELSE '' END,
序 = a.colorder,
字段名= a.name,
标识 = CASE COLUMNPROPERTY(a.id,a.name,'IsIdentity') WHEN 1 THEN '√' ELSE '' END,
主键 = CASE
WHEN EXISTS ( SELECT * FROM sysobjects WHERE xtype='PK'
AND name IN (SELECT [name] FROM sysindexes WHERE id=a.id
AND indid IN (SELECT indid FROM sysindexkeys WHERE id=a.id
AND colid IN (SELECT colid FROM syscolumns WHERE id=a.id
AND name=a.name)))) THEN '√' ELSE '' END,
类型= b.name,
字节数= a.length,
长度 = COLUMNPROPERTY(a.id,a.name,'Precision'),
小数 = CASE ISNULL(COLUMNPROPERTY(a.id,a.name,'Scale'),0) WHEN 0 THEN '' ELSE CAST(COLUMNPROPERTY(a.id,a.name,'Scale') AS VARCHAR) END,
允许空= CASE a.isnullable WHEN 1 THEN '√' ELSE '' END,
默认值= ISNULL(d.[text],''),
说明 = ISNULL(e.[value],'')
FROM syscolumns a
LEFT JOIN systypes b ON a.xtype=b.xusertype
INNER JOIN sysobjects c ON a.id=c.id AND c.xtype='U' AND c.name<>'dtproperties'
LEFT JOIN syscomments d ON a.cdefault=d.id
LEFT JOIN sys.extended_properties e ON a.id=e.class AND a.colid=e.minor_id
ORDER BY c.name, a.colorder
6.获取所有的库名
--获取服务器中的所遇库名
select * from master..sysdatabases
7.获取服务器上所有库的所有表
--获取服务器上所有库的所有表名
use master
declare @db_name varchar(100)
declare @sql varchar(200)
declare cur_tables cursor
for
select name from sysdatabases /*where name like 'by_%'*/
open cur_tables
fetch next from cur_tables into @db_name
while @@fetch_status = 0
begin
--set @db_name = @db_name + '.dbo.sysobjects'
print @db_name
set @sql = 'select * from ' + @db_name + '.dbo.sysobjects where xtype =''U'''
exec (@sql)
fetch next from cur_tables into @db_name
end
close cur_tables
deallocate cur_tables
go
