SQL代码片段备忘

这几天用的SQL代码片段，备忘：

DBCC CHECKIDENT ('TableName', RESEED, 0)---重置自增主键

　　

select ident_current('AlipayEmails')--当前最新的自增主键

　　

USE [master]---SQL2008 压缩日志
GO
ALTER DATABASE [Superyx] SET RECOVERY SIMPLE WITH NO_WAIT
GO
ALTER DATABASE [Superyx] SET RECOVERY SIMPLE   --简单模式
GO
USE [Superyx] 
GO
DBCC SHRINKFILE (N'Super_JC_log' , 11, TRUNCATEONLY)
GO
USE [master]
GO
ALTER DATABASE [Superyx] SET RECOVERY FULL WITH NO_WAIT
GO
ALTER DATABASE [Superyx] SET RECOVERY FULL  --还原为完全模式
GO

　　

获取数据库表结构信息 

 var sql = "select table_name=(case when t_c.column_id=1 then t_o.name else '' end)," +
   " column_id=t_c.column_id," +
   " column_name=t_c.name," +
   " type=t.name," +
   " max_length=t_c.max_length," +
   "precision=isnull(t_c.precision,0)," +
   " scale=isnull(t_c.scale,0)," +
    "is_identity=case when t_c.is_identity=1 then '√' else '' end,  " +
   " is_primary=" +
   " (" +
     "   case when exists" +
      "  (" +
         "   select 1 from sys.indexes i,sys.index_columns ic,sys.objects o" +
          "      where o.type='PK' and o.name=i.name and i.index_id=ic.index_id " +
            "        and i.object_id=ic.object_id and ic.column_id=t_c.column_id " +
              "      and o.parent_object_id=t_c.object_id" +
       ")" +
       " then '√'" +
       " else ''" +
        "end" +
    ")," +
   " is_nullable=case when t_c.is_nullable=1 then '√' else '' end," +
   " default_value=isnull(c.definition,'')," +
   " description=isnull(e.value,'')," +
   " fk_column_name=isnull(f_c.name,'')," +
   " fk_table_name=isnull(f_o.name,'')" +
" from sys.columns t_c" +
  "  inner join sys.objects t_o on t_c.object_id=t_o.object_id  " +
  "  left join sys.types t on t.system_type_id=t_c.system_type_id " +
   "     and t.user_type_id=t_c.user_type_id" +
   " left join sys.default_constraints c on c.object_id=t_c.default_object_id " +
   "     and c.parent_object_id=t_c.object_id and c.parent_column_id=t_c.column_id" +
   " left join sys.extended_properties e on e.major_id=t_c.object_id " +
   "     and e.minor_id=t_c.column_id   " +
    "left join " +
   " (" +
     "   select parent_object_id,referenced_object_id,column_id=min(key_index_id) from sys.foreign_keys" +
     "       group by parent_object_id,referenced_object_id" +
   " )f on f.parent_object_id=t_c.object_id and f.column_id=t_c.column_id  " +
  "  left join sys.columns f_c on f_c.object_id=f.referenced_object_id and f_c.column_id=f.column_id" +
   " left join sys.objects f_o on f_o.object_id=f.referenced_object_id" +
   "  where t_o.type='U' and t_o.name<>'sysdiagrams'" +
   " order by t_o.name,t_c.column_id";

　　

获取SQL数据库表大小

create table #t(name varchar(255), rows bigint, reserved varchar(20), data varchar(20), index_size varchar(20), unused varchar(20))
exec sp_MSforeachtable "insert into #t exec sp_spaceused '?'" 
select * from #t
drop table #t