Question

PDOStatement :: getColumnMeta 不支持Microsoft Access驱动程序（* .mdb）。如何使用PDO动态获取字段名称？

注意： 我不会事先知道sql查询。 $ sql 以下仅供演示。

$dbh = new PDO("odbc:Driver={Microsoft Access Driver 
                (*.mdb)};Dbq=C:\database.mdb;Uid=Admin");

// Sample SQL could be used
$sql = "SELECT name, SUM(b) AS sumvalue FROM table GROUP BY name";

$result = $dbh->query($sql);
$data = [];
while ($row = $result->fetch()) {
    for ($i = 0; $i < $result->columnCount(); $i++) {
        $col = $result->getColumnMeta($i);   //<------ This line not supported

        $fieldName = $col['name'];
        if (!isset($data[$fieldName])) $data[$fieldName] = [];
        array_push($data[$fieldName], $row[$fieldName]);
    }
}

// Get JSON result
echo json_encode($data);

Answer 1

尝试类似的事情：

<?php
$fName = '';
$sumVal = '';
$pdoStr = 'odbc:Driver={Microsoft Access Driver (*.mdb)};Dbq=C:\database.mdb;Uid=Admin"';
$dbh = new PDO($pdoStr);
$dbh->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);
$sql = "SELECT name, SUM(b) AS sumvalue FROM table GROUP BY name";
$result = $dbh->query($sql);
$data = $result->fetchAll();
// here, you only have two fields, "name" and "sumvalue", so, you need to use these fields only, so this will work
foreach($data as $row) {
    $fName = row['Name'];
    $sumVal = row['sumvalue'];
    // ...
}
?>

希望有所帮助！

和平！

Answer 2

您无需使用getColumnMeta()来获取列名称。如果您使用的是PDO::FETCH_ASSOC，则列名将成为关联数组的键。你可以循环一下：

$results = $dbh->query($sql)->fetchAll(PDO::FETCH_ASSOC);

$data = [];
foreach ($results as $row) {
    foreach ($row as $key => $value) {
        $data[$key][] = $value;
    }
}

// Get JSON result
echo json_encode($data);

注意：您也可以将此设置为该连接的默认提取模式：

$dbh = new PDO("odbc:Driver={Microsoft Access Driver 
            (*.mdb)};Dbq=C:\database.mdb;Uid=Admin");
$dbh->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);

这样，您每次fetch() / fetchAll()时都无需指定。

php获取旧版ms-access（.mdb）的列名

2 个答案: