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开发学院数据库Sybase StoredProcedure(存储过程)编写经验和优化措施 阅读

StoredProcedure(存储过程)编写经验和优化措施

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核心提示: 收藏几段SQL Server语句和存储过程 -- ==--列出sql server(WINDOWS平台上强大的数据库平台) 所有表,字段名,StoredProcedure(存储过程)编写经验和优化措施(6),主键,类型,长度,一个值等信息并导出到Excel 中-- ==-- Export all user tabl

收藏几段SQL  Server语句和存储过程

 

-- ======================================================

--列出sql server(WINDOWS平台上强大的数据库平台) 所有表,字段名,主键,类型,长度,小数位数等信息

--在查询分析器里运行即可,可以生成一个表,导出到EXCEL中

-- ======================================================

SELECT

    (case when a.colorder=1 then d.name else '' end)表名,

    a.colorder 字段序号,

    a.name 字段名,

    (case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end) 标识,

    (case when (SELECT count(*)

    FROM sysobjects

    WHERE (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))))))) AND

        (xtype = 'PK'))>0 then '√' else '' end) 主键,

    b.name 类型,

    a.length 占用字节数,

    COLUMNPROPERTY(a.id,a.name,'PRECISION') as 长度,

    isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0) as 小数位数,

    (case when a.isnullable=1 then '√'else '' end) 允许空,

    isnull(e.text,'') 默认值,

    isnull(g.[value],'') AS 字段说明  

 

FROM  syscolumns  a left join systypes b

on  a.xtype=b.xusertype

inner join sysobjects d

on a.id=d.id  and  d.xtype='U' and  d.name<>'dtproperties'

left join syscomments e

on a.cdefault=e.id

left join sysproperties g

on a.id=g.id AND a.colid = g.smallid 

order by a.id,a.colorder

-------------------------------------------------------------------------------------------------

 

 

 

 

 

 

列出sql server(WINDOWS平台上强大的数据库平台) 所有表、字段定义,类型,长度,一个值等信息

并导出到Excel 中

-- ======================================================

-- Export all user tables definition and one sample value

-- jan-13-2003,Dr.Zhang

-- ======================================================

在查询分析器里运行:

SET ANSI_NULLS OFF

GO

SET NOCOUNT ON

GO

 

SET LANGUAGE 'Simplified Chinese'

go

DECLARE @tbl nvarchar(200),@fld nvarchar(200),@sql nvarchar(4000),@maxlen int,@sample nvarchar(40)

 

SELECT d.name TableName,a.name FieldName,b.name TypeName,a.length Length,a.isnullable IS_NULL INTO #t

FROM  syscolumns  a,  systypes b,sysobjects d 

WHERE  a.xtype=b.xusertype  and  a.id=d.id  and  d.xtype='U'

 

DECLARE read_cursor CURSOR

FOR SELECT TableName,FieldName FROM #t

 

SELECT TOP 1 '_TableName           ' TableName,

       'FieldName            ' FieldName,'TypeName       ' TypeName,

       'Length' Length,'IS_NULL' IS_NULL,

       'MaxLenUsed' AS MaxLenUsed,'Sample Value      ' Sample,

       'Comment  ' Comment INTO #tc FROM #t

 

OPEN read_cursor

 

FETCH NEXT FROM read_cursor INTO @tbl,@fld

WHILE (@@fetch_status <> -1)  --- failes

BEGIN

    IF (@@fetch_status <> -2) -- Missing

    BEGIN

        SET @sql=N'SET @maxlen=(SELECT max(len(cast('+@fld+' as nvarchar))) FROM '+@tbl+')'

        --PRINT @sql

        EXEC SP_EXECUTESQL @sql,N'@maxlen int OUTPUT',@maxlen OUTPUT

        --print @maxlen

        SET @sql=N'SET @sample=(SELECT TOP 1 cast('+@fld+' as nvarchar) FROM '+@tbl+' WHERE len(cast('+@fld+' as nvarchar))='+convert(nvarchar(5),@maxlen)+')'

        EXEC SP_EXECUTESQL @sql,N'@sample varchar(30) OUTPUT',@sample OUTPUT

        --for quickly 

        --SET @sql=N'SET @sample=convert(varchar(20),(SELECT TOP 1 '+@fld+' FROM '+

           --@tbl+' order by 1 desc ))' 

        PRINT @sql

        print @sample

        print @tbl

        EXEC SP_EXECUTESQL @sql,N'@sample nvarchar(30) OUTPUT',@sample OUTPUT

        INSERT INTO #tc SELECT *,ltrim(ISNULL(@maxlen,0)) as MaxLenUsed,

           convert(nchar(20),ltrim(ISNULL(@sample,' '))) as Sample,' ' Comment FROM #t where TableName=@tbl and FieldName=@fld

    END

    FETCH NEXT FROM read_cursor INTO @tbl,@fld

END

 

CLOSE read_cursor

DEALLOCATE read_cursor

GO

 

SET ANSI_NULLS ON

GO

SET NOCOUNT OFF

GO

select count(*)  from #t

DROP TABLE #t

GO

 

select count(*)-1  from #tc

 

select * into ##tx from #tc order by tablename

DROP TABLE #tc

 

--select * from ##tx

 

declare @db nvarchar(60),@sql nvarchar(3000)

set @db=db_name()

--请修改用户名和口令 导出到Excel 中

set @sql='exec master.dbo.xp_cmdshell ''bcp ..dbo.##tx out c:\'+@db+'_exp.xls -w -C936 -Usa -Psa '''

print @sql

exec(@sql)

GO

DROP TABLE ##tx

GO

 

 

 

-- ======================================================

--根据表中数据生成insert语句的存储过程

--建立存储过程,执行 spGenInsertSQL 表名

--感谢playyuer

-- ======================================================

CREATE  proc spGenInsertSQL (@tablename varchar(256))

 

as

begin

  declare @sql varchar(8000)

  declare @sqlValues varchar(8000)

  set @sql =' ('

  set @sqlValues = 'values (''+'

  select @sqlValues = @sqlValues + cols + ' + '','' + ' ,@sql = @sql + '[' + name + '],'

   from

     (select case

          when xtype in (48,52,56,59,60,62,104,106,108,122,127)                

            then 'case when '+ name +' is null then ''NULL'' else ' + 'cast('+ name + ' as varchar)'+' end'

          when xtype in (58,61)

            then 'case when '+ name +' is null then ''NULL'' else '+''''''''' + ' + 'cast('+ name +' as varchar)'+ '+'''''''''+' end'

          when xtype in (167)

            then 'case when '+ name +' is null then ''NULL'' else '+''''''''' + ' + 'replace('+ name+','''''''','''''''''''')' + '+'''''''''+' end'

          when xtype in (231)

            then 'case when '+ name +' is null then ''NULL'' else '+'''N'''''' + ' + 'replace('+ name+','''''''','''''''''''')' + '+'''''''''+' end'

          when xtype in (175)

            then 'case when '+ name +' is null then ''NULL'' else '+''''''''' + ' + 'cast(replace('+ name+','''''''','''''''''''') as Char(' + cast(length as varchar)  + '))+'''''''''+' end'

          when xtype in (239)

            then 'case when '+ name +' is null then ''NULL'' else '+'''N'''''' + ' + 'cast(replace('+ name+','''''''','''''''''''') as Char(' + cast(length as varchar)  + '))+'''''''''+' end'

          else '''NULL'''

         end as Cols,name

      from syscolumns 

      where id = object_id(@tablename)

     ) T

  set @sql ='select ''INSERT INTO ['+ @tablename + ']' + left(@sql,len(@sql)-1)+') ' + left(@sqlValues,len(@sqlValues)-4) + ')'' from '+@tablename

  --print @sql

  exec (@sql)

end

 

GO

 

 

 

-- ======================================================

--根据表中数据生成insert语句的存储过程

--建立存储过程,执行 proc_insert 表名

--感谢Sky_blue

-- ======================================================

 

CREATE proc proc_insert (@tablename varchar(256))

as

begin

    set nocount on

    declare @sqlstr varchar(4000)

    declare @sqlstr1 varchar(4000)

    declare @sqlstr2 varchar(4000)

    select @sqlstr='select ''insert '+@tablename

    select @sqlstr1=''

    select @sqlstr2=' ('

    select @sqlstr1= ' values ( ''+'

    select @sqlstr1=@sqlstr1+col+'+'',''+' ,@sqlstr2=@sqlstr2+name +',' from (select case

--   when a.xtype =173 then 'case when '+a.name+' is null then ''NULL'' else '+'convert(varchar('+convert(varchar(4),a.length*2+2)+'),'+a.name +')'+' end'

    when a.xtype =104 then 'case when '+a.name+' is null then ''NULL'' else '+'convert(varchar(1),'+a.name +')'+' end'

    when a.xtype =175 then 'case when '+a.name+' is null then ''NULL'' else '+'''''''''+'+'replace('+a.name+','''''''','''''''''''')' + '+'''''''''+' end'

    when a.xtype =61  then 'case when '+a.name+' is null then ''NULL'' else '+'''''''''+'+'convert(varchar(23),'+a.name +',121)'+ '+'''''''''+' end'

    when a.xtype =106 then 'case when '+a.name+' is null then ''NULL'' else '+'convert(varchar('+convert(varchar(4),a.xprec+2)+'),'+a.name +')'+' end'

    when a.xtype =62  then 'case when '+a.name+' is null then ''NULL'' else '+'convert(varchar(23),'+a.name +',2)'+' end'

    when a.xtype =56  then 'case when '+a.name+' is null then ''NULL'' else '+'convert(varchar(11),'+a.name +')'+' end'

    when a.xtype =60  then 'case when '+a.name+' is null then ''NULL'' else '+'convert(varchar(22),'+a.name +')'+' end'

    when a.xtype =239 then 'case when '+a.name+' is null then ''NULL'' else '+'''''''''+'+'replace('+a.name+','''''''','''''''''''')' + '+'''''''''+' end'

    when a.xtype =108 then 'case when '+a.name+' is null then ''NULL'' else '+'convert(varchar('+convert(varchar(4),a.xprec+2)+'),'+a.name +')'+' end'

    when a.xtype =231 then 'case when '+a.name+' is null then ''NULL'' else '+'''''''''+'+'replace('+a.name+','''''''','''''''''''')' + '+'''''''''+' end'

    when a.xtype =59  then 'case when '+a.name+' is null then ''NULL'' else '+'convert(varchar(23),'+a.name +',2)'+' end'

    when a.xtype =58  then 'case when '+a.name+' is null then ''NULL'' else '+'''''''''+'+'convert(varchar(23),'+a.name +',121)'+ '+'''''''''+' end'

    when a.xtype =52  then 'case when '+a.name+' is null then ''NULL'' else '+'convert(varchar(12),'+a.name +')'+' end'

    when a.xtype =122 then 'case when '+a.name+' is null then ''NULL'' else '+'convert(varchar(22),'+a.name +')'+' end'

    when a.xtype =48  then 'case when '+a.name+' is null then ''NULL'' else '+'convert(varchar(6),'+a.name +')'+' end'

--   when a.xtype =165 then 'case when '+a.name+' is null then ''NULL'' else '+'convert(varchar('+convert(varchar(4),a.length*2+2)+'),'+a.name +')'+' end'

    when a.xtype =167 then 'case when '+a.name+' is null then ''NULL'' else '+'''''''''+'+'replace('+a.name+','''''''','''''''''''')' + '+'''''''''+' end'

    else '''NULL'''

    end as col,a.colid,a.name

    from syscolumns a where a.id = object_id(@tablename) and a.xtype <>189 and a.xtype <>34 and a.xtype <>35 and  a.xtype <>36

    )t order by colid

   

    select @sqlstr=@sqlstr+left(@sqlstr2,len(@sqlstr2)-1)+') '+left(@sqlstr1,len(@sqlstr1)-3)+')'' from '+@tablename

--  print @sqlstr

    exec( @sqlstr)

    set nocount off

end

GO

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Tags:StoredProcedure 存储 过程

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