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POHow can I get column names via PDO/Sqlite when query returns no records?
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2012-06-13T14:02:02.087
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2015-05-01T18:44:28.377
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<p>The following code allows me to pass an SQL statement to a class and call its method to display a nice table of the results, including column names.</p> <p>However, <strong>if there are no results, I still want the column names</strong> to be displayed.</p> <p>Unfortunately, <code>getColumnMeta</code> is not returning any data as it does in other examples I have found.</p> <p><strong>Does anyone know how to get getColumnMeta() working in this example, or another way I can get the names of the fields from the SQL statement when the query returns zero rows?</strong></p> <pre><code><!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <style type="text/css"> table thead tr td { background-color: #ddd; padding: 5px; font-weight: bold; } table tbody tr td { background-color: #eee; padding: 5px; color: navy; } div.sqlCommand { font-family: courier; } h2 { border-bottom: 1px solid #777; } </style> </head> <body> <?php $sql = 'SELECT LastName,FirstName,Title FROM employee WHERE 1=2 ORDER BY LastName'; echo '<h2>sqlite</h2>'; $dbSqlite = new DbSqlite($sql); echo $dbSqlite -> displayHtmlTable(); class DbSqlite { protected $sql; protected $records = array(); protected $columnNames = array(); public function __construct($sql) { $this -> sql = $sql; $this -> initialize(); } protected function initialize() { $db = new PDO('sqlite:chinook.sqlite'); $result = $db -> query($this -> sql); $result -> setFetchMode(PDO::FETCH_ASSOC); $columnsAreDefined = false; while ($row = $result -> fetch()) { $this -> records[] = $row; if (!$columnsAreDefined) { foreach ($row as $columnName => $dummy) { $this -> columnNames[] = $columnName; } $columnsAreDefined = true; } } if (count($this -> records) == 0) { $total_column = $result -> columnCount(); var_dump($total_column); for ($x = 0; $x < $total_column; $x++) { $meta = $result -> getColumnMeta($x); //var_dump($meta); //bool(false) //$column[] = $meta['name']; } } } public function displayHtmlTable() { $r = ''; $r .= '<div class="sqlCommand">' . $this -> sql . '</div>'; $r .= '<table>'; $r .= '<thead>'; $r .= '<tr>'; foreach ($this->columnNames as $columnName) { $r .= '<td>' . $columnName . '</td>'; } $r .= '</tr>'; $r .= '</thead>'; $r .= '<tbody>'; foreach ($this->records as $record) { $r .= '<tr>'; foreach ($record as $data) { $r .= '<td>' . $data . '</td>'; } $r .= '</tr>'; } $r .= '</tbody>'; $r .= '<table>'; return $r; } } ?> </body> </html> </code></pre>
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How can I get column names via PDO/Sqlite when query returns no records?
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