把sqlserver的存储过程改为oracle的

下面是一个sqlserver的分页存储过程，但是要用到oracle上要怎么改？怎么改为符合oracle语法的存储过程，拜托~！！！

set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go


create Procedure [dbo].[Page]
@TableName varchar(50), --表名
@Fields varchar(1000) = '*', --字段名(全部字段为*)
@OrderField varchar(1000), --排序字段(必须!支持多字段)
@sqlWhere varchar(1000) = Null,--条件语句(不用加where)
@pageSize int, --每页多少条记录
@pageIndex int = 1 , --指定当前为第几页
@TotalPage int output --返回总页数
as
begin

Begin Tran --开始事务

Declare @sql nvarchar(4000);
Declare @totalRecord int;
Declare @total nvarchar(400);

--计算总记录数
set @sql = 'select @totalRecord = count(*) from ' + @TableName
if (@SqlWhere='' or @sqlWhere=NULL)
set @sql = 'select @totalRecord = count(*) from ' + @TableName
else
set @sql = 'select @totalRecord = count(*) from ' + @TableName + ' where ' + @sqlWhere

EXEC sp_executesql @sql,N'@totalRecord int OUTPUT',@totalRecord OUTPUT--计算总记录数

--计算总数量
select @TotalPage=@totalRecord--CEILING((@totalRecord+0.0)/@PageSize)+1
set @total = @totalRecord;
set @Fields = @Fields+','+@total+' as totalcount'

set @sql = 'Select * FROM (select ROW_NUMBER() Over(order by ' + @OrderField + ') as rowId,' + @Fields + ' from ' + @TableName

if (@SqlWhere='' or @sqlWhere=NULL)
set @sql = 'Select * FROM (select ROW_NUMBER() Over(order by ' + @OrderField + ') as rowId,' + @Fields + ' from ' + @TableName
else
set @sql = 'Select * FROM (select ROW_NUMBER() Over(order by ' + @OrderField + ') as rowId,' + @Fields + ' from ' + @TableName + ' where ' + @SqlWhere


--处理页数超出范围情况
if @PageIndex<=0
Set @pageIndex = 1

if @pageIndex>@TotalPage
Set @pageIndex = @TotalPage

--处理开始点和结束点
Declare @StartRecord int
Declare @EndRecord int

set @StartRecord = (@pageIndex-1)*@PageSize + 1
set @EndRecord = @StartRecord + @pageSize - 1

--继续合成sql语句
set @Sql = @Sql + ') as ' + @TableName + ' where rowId between ' + Convert(varchar(50),@StartRecord) + ' and ' + Convert(varchar(50),@EndRecord)
--print @Sql
Exec(@Sql)

print @TotalPage
If @@Error <> 0
Begin
RollBack Tran
Return -1
End
Else
Begin
Commit Tran
--print @totalRecord
Return @totalRecord ---返回记录总数


End

end