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我需要对下面显示的 php 代码的结果进行分页。我尝试了几种可能性,但无济于事。为了不篡改主脚本,我创建了几个测试代码,其中最接近我想要的结果的唯一代码是:

<?php
include( "conectiondetails.inc" );
mysql_select_db( $database, $cxn );
$query1 = "SELECT * from table";
$result1 = mysql_query( $query1, $cxn ) or die ( "Couldn't execute query." . mysql_error() );
$row1 = mysql_fetch_array( $result1 );
$category = 'tools';
for( $i = 1; $i <= 3; $i++ ) {
    if( $row1[ 'Category' . "$i" ] == "$category" ) {
        $cat = 'Category' . "$i";
        $ad = 'Placement' . "$i";
        $query2 = "SELECT Email, $ad, $cat FROM table WHERE $cat='$category'";
        $result2 = mysql_query( $query2, $cxn ) or die ( "Couldn't execute query." . mysql_error() );
        $nr = mysql_num_rows( $result2 ); // Get total of Num rows from the database query
        if( isset( $_GET[ 'pn' ] ) ) { // Get pn from URL vars if it is present
            $pn = preg_replace( '#[^0-9]#i', '', $_GET[ 'pn' ] ); // filter everything but numbers for security(new)
            //$pn = ereg_replace("[^0-9]", "", $_GET['pn']); // filter everything but numbers for security(deprecated)
        } else { // If the pn URL variable is not present force it to be value of page number 1
            $pn = 1;
        }
//This is where we set how many database items to show on each page
        $itemsPerPage = 3;
// Get the value of the last page in the pagination result set
        $lastPage = ceil( $nr / $itemsPerPage );
// Be sure URL variable $pn(page number) is no lower than page 1 and no higher than $lastpage
        if( $pn < 1 ) { // If it is less than 1
            $pn = 1; // force if to be 1
        } else {
            if( $pn > $lastPage ) { // if it is greater than $lastpage
                $pn = $lastPage; // force it to be $lastpage's value
            }
        }
// This creates the numbers to click in between the next and back buttons
// This section is explained well in the video that accompanies this script
        $centerPages = "";
        $sub1 = $pn - 1;
        $sub2 = $pn - 2;
        $add1 = $pn + 1;
        $add2 = $pn + 2;
        if( $pn == 1 ) {
            $centerPages .= '&nbsp; <span class="pagNumActive">' . $pn . '</span> &nbsp;';
            $centerPages .= '&nbsp; <a href="' . $_SERVER[ 'PHP_SELF' ] . '?pn=' . $add1 . '">' . $add1 . '</a> &nbsp;';
        } else {
            if( $pn == $lastPage ) {
                $centerPages .= '&nbsp; <a href="' . $_SERVER[ 'PHP_SELF' ] . '?pn=' . $sub1 . '">' . $sub1 . '</a> &nbsp;';
                $centerPages .= '&nbsp; <span class="pagNumActive">' . $pn . '</span> &nbsp;';
            } else {
                if( $pn > 2 && $pn < ( $lastPage - 1 ) ) {
                    $centerPages .= '&nbsp; <a href="' . $_SERVER[ 'PHP_SELF' ] . '?pn=' . $sub2 . '">' . $sub2 . '</a> &nbsp;';
                    $centerPages .= '&nbsp; <a href="' . $_SERVER[ 'PHP_SELF' ] . '?pn=' . $sub1 . '">' . $sub1 . '</a> &nbsp;';
                    $centerPages .= '&nbsp; <span class="pagNumActive">' . $pn . '</span> &nbsp;';
                    $centerPages .= '&nbsp; <a href="' . $_SERVER[ 'PHP_SELF' ] . '?pn=' . $add1 . '">' . $add1 . '</a> &nbsp;';
                    $centerPages .= '&nbsp; <a href="' . $_SERVER[ 'PHP_SELF' ] . '?pn=' . $add2 . '">' . $add2 . '</a> &nbsp;';
                } else {
                    if( $pn > 1 && $pn < $lastPage ) {
                        $centerPages .= '&nbsp; <a href="' . $_SERVER[ 'PHP_SELF' ] . '?pn=' . $sub1 . '">' . $sub1 . '</a> &nbsp;';
                        $centerPages .= '&nbsp; <span class="pagNumActive">' . $pn . '</span> &nbsp;';
                        $centerPages .= '&nbsp; <a href="' . $_SERVER[ 'PHP_SELF' ] . '?pn=' . $add1 . '">' . $add1 . '</a> &nbsp;';
                    }
                }
            }
        }
// This line sets the "LIMIT" range... the 2 values we place to choose a range of rows from database in our query
        $limit = 'LIMIT ' . ( $pn - 1 ) * $itemsPerPage . ',' . $itemsPerPage;
// Now we are going to run the same query as above but this time add $limit onto the end of the SQL syntax
// $sql2 is what we will use to fuel our while loop statement below
        $query3 = "SELECT Email, $ad, $cat FROM table WHERE $cat='$category' $limit";
        $result3 = mysql_query( $query3, $cxn ) or die ( "Couldn't execute query." . mysql_error() );
        $paginationDisplay = ""; // Initialize the pagination output variable
// This code runs only if the last page variable is ot equal to 1, if it is only 1 page we require no paginated links to display
        if( $lastPage != "1" ) {
            // This shows the user what page they are on, and the total number of pages
            $paginationDisplay .= 'Page <strong>' . $pn . '</strong> of ' . $lastPage . '&nbsp;  &nbsp;  &nbsp; ';
            // If we are not on page 1 we can place the Back button
            if( $pn != 1 ) {
                $previous = $pn - 1;
                $paginationDisplay .= '&nbsp;  <a href="' . $_SERVER[ 'PHP_SELF' ] . '?pn=' . $previous . '"> Back</a> ';
            }
            // Lay in the clickable numbers display here between the Back and Next links
            $paginationDisplay .= '<span class="paginationNumbers">' . $centerPages . '</span>';
            // If we are not on the very last page we can place the Next button
            if( $pn != $lastPage ) {
                $nextPage = $pn + 1;
                $paginationDisplay .= '&nbsp;  <a href="' . $_SERVER[ 'PHP_SELF' ] . '?pn=' . $nextPage . '"> Next</a> ';
            }
        }
// Build the Output Section Here
        $outputList = '';
        while( $row = mysql_fetch_array( $result3 ) ) {

            $Email = $row[ "Email" ];
            $Placement1 = $row[ 'Placement' . "$i" ];
            $Category1 = $row[ 'Category' . "$i" ];

            $outputList .= '<h1>' . $Placement1 . '</h1><h2>' . $Category1 . ' </h2><hr />';

        }
    }
}// close while loop
?>

<html>
<head>
    <title>My Pagination</title>
    <style type="text/css">
        <!--
        .pagNumActive {
            color: #000;
            border: #060 1px solid;
            background-color: #D2FFD2;
            padding-left: 3px;
            padding-right: 3px;
        }

        .paginationNumbers a:link {
            color: #000;
            text-decoration: none;
            border: #999 1px solid;
            background-color: #F0F0F0;
            padding-left: 3px;
            padding-right: 3px;
        }

        .paginationNumbers a:visited {
            color: #000;
            text-decoration: none;
            border: #999 1px solid;
            background-color: #F0F0F0;
            padding-left: 3px;
            padding-right: 3px;
        }

        .paginationNumbers a:hover {
            color: #000;
            text-decoration: none;
            border: #060 1px solid;
            background-color: #D2FFD2;
            padding-left: 3px;
            padding-right: 3px;
        }

        .paginationNumbers a:active {
            color: #000;
            text-decoration: none;
            border: #999 1px solid;
            background-color: #F0F0F0;
            padding-left: 3px;
            padding-right: 3px;
        }

        -->
    </style>
</head>
<body>
<div style="margin-left:64px; margin-right:64px;">
    <h2>Total Items: <?php echo $nr; ?></h2>
</div>
<div style="margin-left:58px; margin-right:58px; padding:6px; background-color:#FFF; border:#999 1px solid;"><?php echo $paginationDisplay; ?></div>
<div style="margin-left:64px; margin-right:64px;"><?php print "$outputList"; ?></div>
<div style="margin-left:58px; margin-right:58px; padding:6px; background-color:#FFF; border:#999 1px solid;"><?php echo $paginationDisplay; ?></div>
</body>
</html> 

此代码应该检查我的数据库,其中包含 Category1、Category2、Category3、Placement1、Placement2 和 Placement3 作为其列的一部分,选择 Category==tools 的电子邮件、Placement 和 Category。但是,上面的代码仅显示条件为真的第一列并丢弃其余列(在这种情况下,它仅显示 Placement1、Category1 及其对应的电子邮件)。我不知道还能做些什么来让这段代码按照我需要的方式运行。帮助...

4

1 回答 1

1

进行 2 次查询,其中 1 次用于计算您的数据总数,第二次用于限制您显示的记录检查两个链接以了解如何以这种简单的方式执行此操作。

于 2013-01-09T21:56:10.937 回答