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Sqlserver2005迁移至Oracle系列之二:生成存储过程

 2009-03-03 13:11:21 来源:WEB开发网   
核心提示: --创建临时表begin --全局临时表 if not object_id('tempdb..##sp') is null drop table ##sp create table ##sp([id] int identity(1,1),[definition] nvarc

--创建临时表

begin
    --全局临时表
    if not object_id('tempdb..##sp') is null
        drop table ##sp
    create table ##sp([id] int identity(1,1),[definition] nvarchar(4000))
end

--定义存储过程

if @iscreateprocedure = 1
begin
    begin
        declare cr_procedure_name cursor for
            select [name],[object_id]
            from sys.objects
            where (type = 'P') and (is_ms_shipped = 0) and ([name] not like 'sp_%') and ([name] like @name)
            --where (type = 'fn') and (is_ms_shipped = 0) and ([name] not like 'sp_%') and ([name] like @name)
            order by [name]

        open cr_procedure_name
        fetch next from cr_procedure_name into @procedure_name,@procedure_id


        --游标循环处理
        while @@fetch_status = 0
        begin
            insert into ##sp([definition]) select 'create procedure ' +  left(@procedure_name,30)

            --取出procedure的定义
            --将tab替换为空格。极其重要的一步
            select @definition = replace(definition,char(9),replicate(char(32),4)) from sys.sql_modules where object_id = @procedure_id

            --预处理
            begin
                --处理[dbo].dbo.
                set @definition = replace(replace(@definition,'[dbo].',''),'dbo.','')
                --处理[]
                set @definition = replace(replace(@definition,'[',''),']','')
                --处理@@rowcount
                set @definition = replace(@definition,'@@rowcount','SQL%ROWCOUNT')
                --处理@@
                set @definition = replace(@definition,'@@','MSSQL_')
                --处理datatype
                set @definition = replace(@definition,'tinyint','INT')
                set @definition = replace(@definition,'smallint','INT')
                set @definition = replace(@definition,'bigint','NUMERIC(64)')
                set @definition = replace(@definition,'datetime','DATE')
                set @definition = replace(@definition,'varchar','VARCHAR2')
                --处理函数
                set @definition = replace(@definition,'isnull(','nvl(')
                set @definition = replace(@definition,'getdate()','sysdate')
                set @definition = replace(@definition,'len(','length(')
                --set @definition = replace(@definition,'cast(','to_char(')
            end

            set @isdeclare = 0
            set @definition_preline = ''
            set @definition_curline = ''
            set @pos_char10 = charindex(nchar(10),@definition)
            while @pos_char10 > 0
            begin
       
                set @definition_pre = rtrim(left(@definition,@pos_char10))        --char(10)在右侧
                set @definition = right(@definition,len(@definition) - @pos_char10)
               
                --取出下一行语句,供分析用
                set @pos_char101 = charindex(char(10),@definition)
                if @pos_char101 = 0 and len(@definition) > 0
                    set @definition_curline = @definition
                else
                    set @definition_curline = rtrim(left(@definition,@pos_char101))        --char(10)在右侧

                begin
                    --处理create procedure部分
                    if (@isdeclare = 0) and (@definition_pre like 'create%proc%')
                    begin
                        set @isdeclare = 1
                        begin
                            --insert into ##sp([definition]) select 'create procedure ' +  left(@procedure_name,30)
                            insert into ##sp([definition]) select '('
                        end
                        set @definition_pre = null
                    end
                    --处理声明部分的变量
                    if (@isdeclare = 1) and (@definition_pre like '%@%')
                    begin
                        set @definition_pre = rtrim(replace(@definition_pre,char(9),char(32)))
                        set @pos = charindex('output',@definition_pre)
                        if @pos > 0
                        begin
                            set @definition_pre = replace(@definition_pre,'output','')
                            set @pos = charindex(char(32),@definition_pre,charindex('@',@definition_pre))
                            set @definition_pre = left(@definition_pre,@pos) + ' out ' + right(@definition_pre,len(@definition_pre)-@pos)
                        end
                        set @pos = charindex('(',@definition_pre)
                        set @pos2 = charindex(')',@definition_pre)
                        if @pos > 0
                            set @definition_pre = left(@definition_pre,@pos - 1) + right(@definition_pre,len(@definition_pre)-@pos2)
                    end
           
           
                    --处理as部分,完成声明部分的处理
                    if (@isdeclare = 1) and (ltrim(@definition_pre) like 'AS%')
                    begin
                        set @isdeclare = 0
                        insert into ##sp([definition]) select replicate(char(32),4) + 'rs' + replicate(char(32),8) + 'out SYS_REFCURSOR        --返回结果集'
                        insert into ##sp([definition]) select ')'
                        insert into ##sp([definition]) select @definition_pre
                        --insert into ##sp([definition]) select replicate(char(32),4) + 'v_count INT := 0;'
                        --insert into ##sp([definition]) select replicate(char(32),4) + 'v_ErrorRemark VARCHAR2(1024);'
                        insert into ##sp([definition]) select 'BEGIN'
                        insert into ##sp([definition]) select replicate(char(32),4) + 'OPEN rs FOR SELECT * FROM DUAL WHERE 0>1;'
                        set @definition_pre = null
                    end
                end

                --处理begin-end内的变量execute
                if (@definition_pre like '%exec%') or (@definition_pre like '%execute%')
                begin
                    set @tpstr = ltrim(replace(replace(@definition_pre,'execute ','exec '),'exec ',''))
                    set @tpstr = left(@tpstr,charindex(char(32),@tpstr))
                    set @pos = charindex(@tpstr,@definition_pre) + len(@tpstr)
                    set @definition_pre = left(@definition_pre,@pos) + '(' + right(@definition_pre,len(@definition_pre)-@pos) + ');'
                end
               
               
                --处理begin-end内的变量declare
                if @definition_pre like '%declare%@%'
                begin
                    set @definition_pre = rtrim(@definition_pre)
                    set @pos = charindex('--',@definition_pre)
                    if @pos > 0
                        set @definition_pre = left(@definition_pre,@pos - 1) + ';' + right(@definition_pre,len(@definition_pre) - (@pos - 1))
                    else
                        set @definition_pre = @definition_pre + ';'
                end
               
                --处理begin-end内的SET @ErrorRemark
                if (@definition_pre like '%set%@ErrorRemark%=%')
                begin
                    set @pos = charindex('=',@definition_pre)
                    set @definition_pre = right(@definition_pre,len(@definition_pre) - @pos)
                    set @definition_pre = replicate(char(32),8) + '@ErrorRemark = ' + @definition_pre
                end
                   
               
                --处理begin-end内的变量set
                if (@definition_pre like '%set %@%') and (@definition_pre not like '%update % set %') and (@definition_preline not like '%update%')
                    and (@definition_pre not like '%if%') and (@definition_pre not like '%select%') and (@definition_pre not like '%delete%')
                begin
                    set @definition_pre = rtrim(@definition_pre)
                    set @pos = charindex('--',@definition_pre)
                    if @pos > 0
                        set @definition_pre = left(@definition_pre,@pos - 1) + ';' + right(@definition_pre,len(@definition_pre) - (@pos - 1))
                    else
                        set @definition_pre = @definition_pre + ';'
                    set @definition_pre = replace(replace(@definition_pre,'set',''),'=',':=')
                end
               
                --处理begin-end内的select @var = value from ...
                if ((@definition_pre like '%select%@%=%') and (@definition_pre not like '%exists%select%@%=%') and (@definition_curline like '%from %'))
                    or ((@definition_pre like '%select%@%=%from%') and (@definition_pre not like '%exists%select%@%=%'))
                begin
                    set @tpstr3 = 'select '
                    set @pos = charindex(@tpstr3,@definition_pre)
                    set @tpstr = left(@definition_pre,@pos - 1 + len(@tpstr3) )    --select头部
                    set @tpstr1 = ltrim(right(@definition_pre,len(@definition_pre) - (@pos -1 + len(@tpstr3))))
                    set @tpstr3 = ' from '
                    set @pos = charindex(@tpstr3,@tpstr1)
                    if @pos = 0
                        set @tpstr2 = ''
                    else
                    begin
                        set @tpstr2 = ltrim(right(@tpstr1,len(@tpstr1) - @pos + 1 )) --from尾部
                        set @tpstr1 = rtrim(left(@tpstr1,@pos - 1))
                    end
                    set @tpstr4 = ''    --into列表
                    set @tpstr5 = ''    --select列表
                    set @tpstr6 = ''
                    set @pos = charindex('=',@tpstr1)
                   
                    declare @i  int
                    set @i = 0
                    while @pos > 0
                    begin
                        set @i = @i + 1
    --select @i, @pos,@tpstr1,@tpstr4,@tpstr5
                        set @tpstr4 = @tpstr4 + left(@tpstr1,@pos -1) + ' ,'
                        set @tpstr1 = ltrim(right(@tpstr1,len(@tpstr1)-@pos))
                        set @pos = charindex('=',@tpstr1)
                        if @pos = 0
                        begin
                            set @tpstr5 = @tpstr5 + @tpstr1
    --select @i,@pos,@tpstr1,@tpstr4,@tpstr5
                        end
                        else
                        begin
                            set @tpstr6 = reverse(left(@tpstr1,@pos - 1))
                            set @pos1 = charindex(',',@tpstr6)
                            set @tpstr5 = @tpstr5 + reverse(right(@tpstr6,len(@tpstr6)-@pos1 + 1)) + ' '
                            set @tpstr1 = ltrim(right(@tpstr1,len(@tpstr1)-@pos  +  @pos1 ))
    --select @i,'',@tpstr1,@tpstr4,@tpstr5,@pos1,@tpstr6
                            set @pos = charindex('=',@tpstr1)
                        end
    --select @i, @pos,@tpstr1,@tpstr4,@tpstr5
                    end
    --select @definition_pre,@tpstr4
                    if len(@tpstr4)>0
                        set @definition_pre = @tpstr + ' ' + @tpstr5 + ' INTO ' + left(@tpstr4,len(@tpstr4)-1) + ' ' + @tpstr2
                end
                               
                --处理begin-end内的变量select as result
                if ((@definition_pre like '%select%as%result%') or (@definition_pre like '%select%as%state%')) and (@definition_pre not like '%,%')
                begin
                    set @definition_pre = 'OPEN rs FOR ' + @definition_pre + ' FROM DUAL;'
                end

                --处理begin-end内的变量if exists select from
                if @definition_pre like '%if%exists%select%from%'
                begin
                    set @pos = charindex('from',@definition_pre)
                    set @definition_pre = 'SELECT COUNT(1) INTO v_count ' + right(@definition_pre,len(@definition_pre) - @pos + 1)
                    set @definition_pre = rtrim(@definition_pre)
                    set @definition_pre = left(@definition_pre,len(@definition_pre) -1) + ';' + '  ' + 'IF v_count > 0 '
                end
                --为可能的完整语句添加分号
                if (@definition_pre like '%values%(%)%')
                    or( @definition_pre like '%update%set%=%' and @definition_curline not like '%where%')
                    or( @definition_pre like '%delete%from%=%' and @definition_curline not like '%where%')
                    or( @definition_pre like '%order%by%')
                    or( @definition_pre like '%select%into%' and @definition_pre not like '%v_count%' and @definition_curline not like '%from%')
                   
                    set @definition_pre = @definition_pre + ' ;'

--print @definition_pre
                --如果该行语句有效,插入到表里,准备输出
                if not @definition_pre is null
                    insert into ##sp([definition]) select @definition_pre
               
                --取出下一行语句,如果是最后一句,直接插入到表里,准备输出
                set @pos_char10 = charindex(nchar(10),@definition)
                if @pos_char10 = 0 and len(@definition) > 0
                    insert into ##sp([definition]) select  @definition

                set @definition_preline = @definition_pre
            end

            --生成存储过程
            begin
                insert into ##sp([definition]) select  replicate(char(32),4) + 'EXCEPTION'
                insert into ##sp([definition]) select  replicate(char(32),8) + 'WHEN OTHERS THEN'
                insert into ##sp([definition]) select  ''               
                insert into ##sp([definition]) select  replicate(char(32),12) + 'PRINT(SQLERRM);'
                insert into ##sp([definition]) select  replicate(char(32),12) + 'OPEN rs FOR SELECT 1 AS STATE FROM DUAL;'
                insert into ##sp([definition]) select  ''
                insert into ##sp([definition]) select  'END ' +  left(@procedure_name,30) + ';'
                insert into ##sp([definition]) select  '/'
            end
            fetch next from cr_procedure_name into @procedure_name,@procedure_id

        end

        close cr_procedure_name
        deallocate cr_procedure_name

    end
end

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