sybase分页

前两天在找sybase的分页方法时，在网上搜到如下分页的存储过程:

create procedure splitpage @qry varchar(16384),@ipage int, @num int as   
begin 

        declare @rcount int 
        declare @execsql varchar(16384) 
        select @rcount=@ipage*@num 
        set rowcount @rcount 
        set @execsql = stuff(@qry,charindex('select',@qry),6,'select sybid=identity(12),') 
        set @execsql = stuff(@execsql, charindex('from',@execsql),5,'into #temptable1 from') 
        set @execsql = @execsql || ' select * from #temptable1  where sybid>' || convert(varchar,(@ipage-1)*@num) || ' and sybid <= ' || convert(varchar,@ipage*@num) 
        execute (@execsql) 
        set rowcount 0 
end

如果SQL比较复杂，如包含子查询或使用union之类的SQL则会有问题，为了在公司的项目中使用，做了如下修改:
1.修改SQL,将select和from做标记，替换成selects和froms

create procedure splitpage @qry varchar(16384),@ipage int, @num int as   
begin 
        declare @rcount int 
        declare @execsql varchar(16384) 
        select @rcount=@ipage*@num 
        set rowcount @rcount 
        set @execsql = str_replace(@qry,'selects','select sybid=identity(12),') 
        set @execsql = str_replace(@execsql, 'froms','into #temptable1 from') 
        set @execsql = @execsql || ' select * from #temptable1  where sybid>' || convert(varchar,(@ipage-1)*@num) || ' and sybid <= ' || convert(varchar,@ipage*@num) 
        execute (@execsql) 
        set rowcount 0 
end

2.在分页组件中增加parseProcSQL方法，在执行查询前转换SQL:

    public String parseProcSql(String sql){
        String stemp = sql.toUpperCase();
        String v[] = stemp.split("UNION");
        String result = "";
        for(int i=0; i<v.length; i++){
            int tmp = 0;
            int from = 0;
            tmp = v[i].indexOf("SELECT",0);
            if(tmp>0){
                v[i] = v[i].substring(0,tmp) + "SELECTS" + v[i].substring(tmp+6);
            }else{
                v[i] = "SELECTS" + v[i].substring(6);
            }
            
            if(i==0){
                while(tmp!=-1){
                    from = v[i].indexOf("FROM",from+1);
                    tmp = v[i].indexOf("SELECT",tmp+1);
                    if(tmp>from)break;
                }
                result = v[i].substring(0,from) + "FROMS" + v[i].substring(from+4);
            }else{
                result = result + "UNION" + v[i];
            }
        }
        return result;
    }

该方法在使用union all分页时仍然会有问题