sybase使用存储过程分页

Yuanhua — Tue, 21 Jul 2009 05:48:00 GMT

在网上搜到如下存储过程分页的代码:

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parseSQL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;

    }

3.使用union all分页仍然会有问题.

Yuanhua 2009-07-21 13:48 发表评论

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sybase使用存储过程分页