PHP 准备语句 - 重置行指针

Question

我有下面的代码，注释应该清楚地解释。我想查询文件中的给定信息，然后返回结果后，将一个字段添加到结果数组中。然后，稍后在我的程序中访问结果数组。

下面代码的问题是，我认为第二次尝试循环时数组位于最后一条记录...并且重置($stmt1)失败，因为$stmt1“不是数组对象”...

<?php 

$sql1 = "SELECT dpdpt, SUM(dpbir) FROM dwhlib.dwdptstr WHERE dpdpt < '312' GROUP BY dpdpt ";

//Setup connection
$conn_resource = db2_connect ( "*LOCAL", "", "" );

//Verify connection successful
if (! $conn_resource) {
    echo "Connection failed. SQL Err:";
    echo db2_conn_error ();
    echo "<br/>";
    echo db2_conn_errormsg ();
    exit ();
}

//Prepare the stmt
$stmt1 = db2_prepare ( $conn_resource, $sql1 );

//Execute the prepared statement
if (! db2_execute ( $stmt1 )) {
    echo 'The db2 execute failed. ';
    echo 'SQLSTATE value: ' . db2_stmt_error ();
    echo ' Message: ' . db2_stmt_errormsg ();
    exit ();
}

//Loop through all rows, adding a third field
while ( $row1 = &db2_fetch_array ( $stmt1 ) ) {
    $row1[2] = "TEST";
}

//Reset stmt or array back to first record
//??

//Print results
echo "<table border=1>";
while ( $row = db2_fetch_array ( $stmt1 ) ) {
    echo "<tr>";
    echo "  <td>" . $row[0] . "</td>";
    echo "  <td>" . $row[1] . "</td>";
    echo "  <td>" . $row[2] . "</td>";
    echo "</tr>";
}
echo "</table>";

?>

Answer 1

我认为这是不可能的。但无论如何，并没有真正令人信服的理由尝试这样做。

保持简单。只需在第一次构建一个数组即可。

$rows = array();
//Loop through all rows, adding a third field
while ( $row = db2_fetch_array ( $stmt1 ) ) {
    $row[2] = "TEST";
    $rows[] = $row;
}
db2_free_result($stmt1);

//Print results
echo "<table border=1>";
foreach($rows as $row) {
    echo "<tr>";
    echo "  <td>" . $row[0] . "</td>";
    echo "  <td>" . $row[1] . "</td>";
    echo "  <td>" . $row[2] . "</td>";
    echo "</tr>";
}
echo "</table>";

最坏的情况是，在构建数组时，这会暂时使内存使用量增加一倍。