带有变量 BETWEEN 的 DB2 SQL 分页答案

【问题标题】：DB2 SQL Pagination with a variable BETWEEN带有变量 BETWEEN 的 DB2 SQL 分页
【发布时间】：2015-09-10 18:37:53
【问题描述】：

所以，我必须使用 DB2 对站点数据库进行分页，每页显示 10 个结果。但是，当我使用FETCH FIRST 10 ROWS ONLY 时，所有页面都显示相同的 10 个第一个结果。我搜索并认为我必须将BETWEEN 0 AND 9 与范围变量一起使用，但无论我做什么，我似乎都无法正确获取 SQL 代码。我总是收到错误消息odbc_fetch_row(): supplied argument is not a valid ODBC result resource。

我为偏移量创建了变量：

//offset for the query
$limit = 10;
$offset = ($currentpage - 1)  * $limit;
$start = $offset + 1;
$end = min(($offset + $limit), $total);
$offsetend = $end - 1;

并从数据库中获取信息：

$busca="";
    if(isset($_GET['palavra']))
    {
        $busca=($_GET['palavra']);
    }
    $SQL1 = "SELECT PALAVRA.CODPAL, PALAVRA.NMPAL, PALAVRA.NMLIBTRANS 
    FROM (SELECT ROW_NUMBER() OVER (ORDER BY PALAVRA.NMPAL ASC) AS ROWNUM
    FROM MAXADM.PALAVRA WHERE PALAVRA.NMPAL LIKE '$busca%') AS P 
    WHERE P.ROWNUM BETWEEN $offset AND $offsetend";

    $rs1=getInfo($SQL1);
    while(odbc_fetch_row($rs1))
    {
    $cod_palavra = odbc_result($rs1,"CODPAL");
    $palavra = odbc_result($rs1,"NMPAL");
    $librastrans = odbc_result($rs1,"NMLIBTRANS");
    }

我做错了什么？非常感谢！

【问题讨论】：

标签： php sql pagination db2 between

【解决方案1】：

按照目前的编写，关联名称为P 的子选择仅包含一列ROWNUM：

SELECT PALAVRA.CODPAL, PALAVRA.NMPAL, PALAVRA.NMLIBTRANS 
FROM (
  SELECT ROW_NUMBER() OVER (ORDER BY PALAVRA.NMPAL ASC) AS ROWNUM
    FROM MAXADM.PALAVRA WHERE PALAVRA.NMPAL LIKE '$busca%'
) AS P 
WHERE P.ROWNUM BETWEEN $offset AND $offsetend

所以你显然不能从中选择PALAVRA.CODPAL, PALAVRA.NMPAL, PALAVRA.NMLIBTRANS。

尝试将查询重写为

SELECT P.CODPAL, P.NMPAL, P.NMLIBTRANS 
FROM (
  SELECT 
    PALAVRA.CODPAL, PALAVRA.NMPAL, PALAVRA.NMLIBTRANS,
    ROW_NUMBER() OVER (ORDER BY PALAVRA.NMPAL ASC) AS ROWNUM
  FROM MAXADM.PALAVRA WHERE PALAVRA.NMPAL LIKE '$busca%'
) AS P 
WHERE P.ROWNUM BETWEEN $offset AND $offsetend

【讨论】：