SQL Server 中统计各用户表记录条数的两种方法_建站学-个人建站指南,网页制作,网站设计,网站制作教程

最近做数据监控遇到这么个查询需求，就从系统存储过程[sys].[sp_tables]中征用了遍历用户表的代码，组织一下，配合以MSSQL 中的表变量，写了如下代码：

方法一：

    DECLARE @NAME VARCHAR(50)
    DECLARE @SQL VARCHAR(1000)

    SET @SQL = '
    DECLARE @RESULT_TABLE TABLE
    (
        [TableName]        VARCHAR(32),
        [RowCount]        INT
    )
    DECLARE @TEMP_COUNT INT'

    DECLARE TB_CURSOR CURSOR FOR

    SELECT
        TABLE_NAME      = CONVERT(SYSNAME,O.NAME)
    FROM
        SYS.ALL_OBJECTS O
    WHERE
        O.TYPE = 'U' AND
        HAS_PERMS_BY_NAME(QUOTENAME(SCHEMA_NAME(O.SCHEMA_ID)) + '.' + QUOTENAME(O.NAME),
                          'OBJECT',
                          'SELECT') = 1

    OPEN TB_CURSOR
    FETCH NEXT FROM TB_CURSOR INTO @NAME

    WHILE @@FETCH_STATUS = 0
    BEGIN
           SET @SQL = @SQL + CHAR(10) + 'INSERT INTO @RESULT_TABLE SELECT ' + '''' + @NAME +  '''' + ',COUNT(1) FROM ' + @NAME + ';'

           FETCH NEXT FROM TB_CURSOR INTO @NAME
    END

    CLOSE TB_CURSOR
    DEALLOCATE TB_CURSOR

    SET @SQL = @SQL + CHAR(10) +'SELECT * FROM @RESULT_TABLE '
    EXEC (@SQL)

这里使用表变量而非临时表，是因为大多数数据库中表的数量不会太多，使得临时表（或表变量）中的记录条数不会很多。如此一来，借以表变量，将数据暂时存放放在内存中要比存放在tempDB中更加高效。

基本思路为：

1.从系统视图SYS.ALL_OBJECTS中取出所有用户表的表名。

2.用游标遍历所有表名，并使用select count(1)来统计该表行数，并拼接成相应的暂存SQL代码。

3.执行生成的SQL代码，取得数据结果集。其中生成的SQL代码为：

   DECLARE @RESULT_TABLE TABLE
    (
        [TableName]        VARCHAR(32),
        [RowCount]        INT
    )
    DECLARE @TEMP_COUNT INT

    -- each tables
    INSERT INTO @RESULT_TABLE SELECT 'LDMMessage',COUNT(1) FROM LDMMessage;
    INSERT INTO @RESULT_TABLE SELECT 'DCSFile',COUNT(1) FROM DCSFile;
    INSERT INTO @RESULT_TABLE SELECT 'SSRCode',COUNT(1) FROM SSRCode;
    INSERT INTO @RESULT_TABLE SELECT 'PRLMessage',COUNT(1) FROM PRLMessage;
    ...

    SELECT * FROM @RESULT_TABLE

写完之后，感觉毕竟使用到了游标和表变量，性能不太理想，应该还有更好的方法，便google了一下，发现也可以从系统视图SYS.SYSOBJECTS中查出用户表名，并使用主键ID连接视图SYS.SYSINDEXES，根据索引的相关数据来获得表的记录条数:

方法二：

   DECLARE @RESULT_TABLE TABLE
    (
        [TableName]        VARCHAR(32),
        [RowCount]        INT
    )

    INSERT INTO
        @RESULT_TABLE
    SELECT
        O.NAME, I.ROWCNT
    FROM
        SYS.SYSOBJECTS O, SYSINDEXES I
    WHERE
        O.ID = I.ID AND
        O.XTYPE = 'U' AND
        I.INDID < 2

    SELECT * FROM @RESULT_TABLE

这里主要使用了SYS.SYSOBJECTS和SYS.SYSINDEXES的连接，并通过 I.INDID < 2 条件找到表的聚集索引或堆记录（Heap：0，聚集索引：1，非聚集索引>1），由此得出Data级别的记录条数RowCnt。

性能对比：

使用SQL Server Profiler来检测两种方法的执行开销，结果如下：

方法一开销62个CPU时间片，而方法二之开销了2个时间片，性能大为胜出。

参考资料：

http://msdn.microsoft.com/en-us/library/ms190324.aspx

http://msdn.microsoft.com/en-us/library/ms178618.aspx

http://msdn.microsoft.com/en-us/library/ms190283.aspx

[sys].[sp_tables]

/****** Object:  StoredProcedure [sys].[sp_tables]    Script Date: 10/27/2010 14:06:19 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

ALTER procedure [sys].[sp_tables]
(
    @table_name         nvarchar(384)   = null,
    @table_owner        nvarchar(384)   = null,
    @table_qualifier    sysname = null,
    @table_type         varchar(100) = null,
    @fUsePattern        bit = 1 -- To allow users to explicitly disable all pattern matching.
)
as
    declare @type1      varchar(3)
    declare @qual_name  nvarchar(517) -- [schema].[table]
    declare @table_id   int

    if @table_qualifier = '%' and @table_owner = '' and @table_name = ''
    begin
        -- Debug output, do not remove it.
        -- print 'Special feature #1:  enumerate databases when owner and name are blank but qualifier is explicitly "%".'
        select
            TABLE_QUALIFIER = convert(sysname,d.name),
            TABLE_OWNER     = convert(sysname,null),
            TABLE_NAME      = convert(sysname,null),
            TABLE_TYPE      = convert(varchar(32),null),
            REMARKS         = convert(varchar(254),null)    -- Remarks are NULL.
        from
            sys.databases d
        where
            d.name <> 'model' -- eliminate MODEL database
        order by 1
        return
    end

    if @table_qualifier = '' and @table_owner = '%' and @table_name = ''
    begin
        -- Debug output, do not remove it.
        -- print 'Special feature #2:  enumerate owners when qualifier and name are blank but owner is explicitly "%".
        select distinct
            TABLE_QUALIFIER = convert(sysname,null),
            TABLE_OWNER     = convert(sysname,schema_name(o.schema_id)),
            TABLE_NAME      = convert(sysname,null),
            TABLE_TYPE      = convert(varchar(32),null),
            REMARKS         = convert(varchar(254),null)    -- Remarks are NULL.
        from
            sys.all_objects o
        where
            o.type in ('S','U','V')  -- limit columns to tables and views only
        order by 2
        return
    end

    if @table_qualifier = '' and @table_owner = '' and @table_name = '' and @table_type = '%'
    begin
        -- Debug output, do not remove it.
        -- print 'Special feature #3:  enumerate table types when qualifier, owner and name are blank but table type is explicitly "%".'
        select
            TABLE_QUALIFIER = convert(sysname,null),
            TABLE_OWNER     = convert(sysname,null),
            TABLE_NAME      = convert(sysname,null),
            TABLE_TYPE      = convert(varchar(32),
                                        rtrim(substring('SYSTEM TABLETABLE       VIEW',(c.column_id-1)*12+1,12))),
            REMARKS         = convert(varchar(254),null)    -- Remarks are NULL.
        from
            sys.all_objects o,
            sys.all_columns c
        where
            o.object_id = c.object_id and o.object_id = object_id('sysusers') and
            c.column_id <= 3 -- ISSUE - what is this for ???
        return
    end

    --
    -- End of special features - do normal processing.
    --

    if @table_qualifier is not null
    begin
        if db_name() <> @table_qualifier
        begin
            if @table_qualifier = ''
            begin  -- If empty qualifier supplied, force an empty result set.
                select @table_name = ''
                select @table_owner = ''
            end
            else
            begin   -- If qualifier doesn't match current database.
                raiserror (15250, -1,-1)
                return
            end
        end
    end
    select @table_qualifier = null -- it's not needed anymore

    if @table_type is null
    begin   -- Select all ODBC supported table types.
        select @type1 = 'SUV'
    end
    else
    begin
        -- TableType is case sensitive if CS server.
        if (charindex('''SYSTEM TABLE''',@table_type) <> 0)
            select @type1 = 'S' -- Add System Tables.
        else
            select @type1 = ''
        if (charindex('''TABLE''',@table_type) <> 0)
            select @type1 = @type1 + 'U' -- Add User Tables.
        if (charindex('''VIEW''',@table_type) <> 0)
            select @type1 = @type1 + 'V' -- Add Views.
    end

    if @table_name is not null
    begin
        if (@table_owner is null) and (charindex('%', @table_name) = 0)
        begin   -- If owner not specified and table contains wildchar.
            if exists
            (
                select
                        *
                from
                        sys.all_objects o
                where
                        o.schema_id = schema_id() and
                        o.object_id = object_id(@table_name) and
                        o.type in ('U','V','S')
            )
            begin   -- Override supplied owner w/owner of table.
                select @table_owner = schema_name()
            end
        end
    end

    select @qual_name = isnull(quotename(@table_owner), '') + '.' + quotename(@table_name)
    select @table_id = object_id(@qual_name)

    if (@fUsePattern = 1) -- Does the user want it?
    begin
        if ((isnull(charindex('%', @table_name),0) = 0) and
            (isnull(charindex('_', @table_name),0) = 0) and
            (isnull(charindex('%', @table_owner),0) = 0) and
            (isnull(charindex('_', @table_owner),0) = 0) and
            (@table_id is not null))
        begin
            select @fUsePattern = 0 -- not a single wild char, so go the fast way.
        end
    end

    if @fUsePattern = 0
    begin
        /* -- Debug output, do not remove it.
        print '*************'
        print 'There is NO pattern matching.'
        print @fUsePattern
        print isnull(@table_name, '@table_name = null')
        print isnull(@table_owner, '@table_owner = null')
        print isnull(@table_type, '@table_type = null')
        print isnull(@type1, '@type1 = null')
        print '*************'
        */
        select
            TABLE_QUALIFIER = convert(sysname,db_name()),
            TABLE_OWNER     = convert(sysname,schema_name(o.schema_id)),
            TABLE_NAME      = convert(sysname,o.name),
            TABLE_TYPE      = convert(varchar(32),
                                        rtrim(substring('SYSTEM TABLE            TABLE       VIEW       ',
                                        (ascii(o.type)-83)*12+1,12))  -- 'S'=0,'U'=2,'V'=3
                                     ),
            REMARKS = convert(varchar(254),null)    -- Remarks are NULL.

        from
            sys.all_objects o

        where
            o.object_id = @table_id and
            o.type in ('S','U','V') and
            has_perms_by_name(@qual_name, 'object', 'select') = 1 and
            charindex(substring(o.type,1,1),@type1) <> 0 -- Only desired types.
        order by 4, 1, 2, 3
    end
    else
    begin
        /* -- Debug output, do not remove it.
        print '*************'
        print 'THERE IS pattern matching!'
        print @fUsePattern
        print isnull(@table_name, '@table_name = null')
        print isnull(@table_owner, '@table_owner = null')
        print isnull(@table_type, '@table_type = null')
        print isnull(@type1, '@type1 = null')
        print '*************'
        */
        select
            TABLE_QUALIFIER = convert(sysname,db_name()),
            TABLE_OWNER     = convert(sysname,schema_name(o.schema_id)),
            TABLE_NAME      = convert(sysname,o.name),
            TABLE_TYPE      = convert(varchar(32),
                                        rtrim(substring('SYSTEM TABLE            TABLE       VIEW       ',
                                              (ascii(o.type)-83)*12+1,
                                              12))  -- 'S'=0,'U'=2,'V'=3
                                     ),
            REMARKS = convert(varchar(254),null)    -- Remarks are NULL.

        from
            sys.all_objects o

        where
            o.type in ('S','U','V') and
            has_perms_by_name(quotename(schema_name(o.schema_id)) + '.' + quotename(o.name),
                              'object',
                              'select') = 1 and
            charindex(substring(o.type,1,1),@type1) <> 0 and -- Only desired types.
            (@table_name  is NULL or o.name like @table_name) and
            (@table_owner is NULL or schema_name(o.schema_id) like @table_owner)
        order by 4, 1, 2, 3
    end

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