Question

如果我运行以下代码：

    $query = "select * from city where region = :region and country = :country";
    $stmt = db->prepare($query);
    $region = '06';
    $country = 'ad';
    $params = array(":region" => $region, ":country" => $country);
    foreach ($params as $key => $value) {
        $stmt->bindParam($key, $value, PDO::PARAM_STR);
    }
    $stmt->execute();
    return $stmt->fetchAll();

我在查询日志中看到的是：

 select * from city where region = 'ad' and country = 'ad'

为什么？请注意，如果我只是像这样一个接一个地绑定参数，就不会发生这种情况：

$stmt->bindParam(':region', $region, PDO::PARAM_STR);
$stmt->bindParam(':country', $country, PDO::PARAM_STR);

Answer 1

在SLB=data.DataReader("SLB","yahoo",start,end) Traceback (most recent call last): File "<ipython-input-226-0cd57c0d4cbe>", line 1, in <module> SLB=data.DataReader("SLB","yahoo",start,end) File "C:\Users\User\Anaconda3\lib\site- packages\pandas_datareader\data.py", line 116, in DataReader retry_count=retry_count, pause=pause, File "C:\Users\User\Anaconda3\lib\site- packages\pandas_datareader\yahoo\daily.py", line 76, in read """ read one data from specified URL """ File "C:\Users\User\Anaconda3\lib\site- packages\pandas_datareader\base.py", line 155, in read if isinstance(self.symbols, (compat.string_types, int)): File "C:\Users\User\Anaconda3\lib\site- packages\pandas_datareader\base.py", line 74, in _read_one_data out = self._read_url_as_StringIO(url, params=params) File "C:\Users\User\Anaconda3\lib\site- packages\pandas_datareader\base.py", line 85, in _read_url_as_StringIO response = self._get_response(url, params=params) File "C:\Users\User\Anaconda3\lib\site- packages\pandas_datareader\base.py", line 120, in _get_response raise RemoteDataError('Unable to read URL: {0}'.format(url)) RemoteDataError: Unable to read URL: http://ichart.finance.yahoo.com/table.csv? s=SLB&a=0&b=1&c=2000&d=5&e=16&f=2017&g=d&ignore=.csv语句中，您最终会覆盖绑定，而不是添加绑定。由于你有数组，你可以执行：

foreach()

PDO绑定参数在循环时重复

1 个答案: