Oracle db分页查询困难，错误是：“命令未正确结束”

Question

I am doing the following query for pagination. When I run

$s= oci_parse($conn,"select * from TBL_Name order by D_DATE desc");
$r = oci_execute($s);

then no error shown. When I write the following:

$s= oci_parse($conn,"select * from TBL_Name order by D_DATE desc limit $start,$limit");
$r = oci_execute($s);

error is:  oci_execute(): ORA-00933: SQL command not properly ended .

That means problem is with " limit $start,$limit " , But I need this for pagination. LIMIT is not valid in Oracle perhaps. Now how can I write this query?

Answer 1

limit $start,$limit is for MySQL only, it does not help with Oracle or other databases (although as noted by @Charles in the comments, LIMIT with OFFSET is used elsewhere as well ).

With Oracle, it is something like

select * from (
select foo.*, ROWNUM rnum
  from  
( select * from TBL_Name order by D_DATE desc  ) foo
 where ROWNUM <= $end) where rnum >= $start;

Answer 2

ROWNUM is something genrated with your resultset as. pseduocolumn .. so it can be always less than equal to.. so we first generate the rownums for maximum limit and alias using a different name.. and use the alias referring from the outer query.

select * from 
( select a.*, ROWNUM rnum from 
  (select * from TBL_Name order by D_DATE desc ) a 
  where ROWNUM <= $end )
where rnum  >= $start;

PHP code

// Parse a query containing a bind variable.
$stmt = oci_parse($conn, "    select * from  " +
                                          " ( select a.*, ROWNUM rnum from " +
                                          "   (select * from TBL_Name order by D_DATE desc ) a "+
                                          "    where ROWNUM <= :end) "+
                                          "   where rnum  >= :start) ");

// Bind the value into the parsed statement.
oci_bind_by_name($stmt, ":end", $end);
oci_bind_by_name($stmt, ":start", $start);