(PECL maxdb >= 1.0)
maxdb_fetch_lengths -- maxdb_result->lengths — Returns the lengths of the columns of the current row in the result set
过程化风格
面向对象风格
The maxdb_fetch_lengths() function returns an array containing the lengths of every column of the current row within the result set represented by the result parameter. If successful, a numerically indexed array representing the lengths of each column is returned 或者在失败时返回 FALSE.
An array of integers representing the size of each column (not including any terminating null characters). FALSE if an error occurred.
maxdb_fetch_lengths() is valid only for the current row of the result set. It returns FALSE if you call it before calling maxdb_fetch_row/array/resource or after retrieving all rows in the result.
Example #1 Object oriented style
<?php
$maxdb = new maxdb("localhost", "MONA", "RED", "DEMODB");
/* check connection */
if (maxdb_connect_errno()) {
printf("Connect failed: %s\n", maxdb_connect_error());
exit();
}
$query = "SELECT * from hotel.customer WHERE cno = 3000";
if ($result = $maxdb->query($query)) {
$row = $result->fetch_row();
/* display column lengths */
foreach ($result->lengths as $i => $val) {
printf("Field %2d has Length %2d\n", $i+1, $val);
}
$result->close();
}
/* close connection */
$maxdb->close();
?>
Example #2 Procedural style
<?php
$link = maxdb_connect("localhost", "MONA", "RED", "DEMODB");
/* check connection */
if (maxdb_connect_errno()) {
printf("Connect failed: %s\n", maxdb_connect_error());
exit();
}
$query = "SELECT * from hotel.customer WHERE cno = 3000";
if ($result = maxdb_query($link, $query)) {
$row = maxdb_fetch_row($result);
/* display column lengths */
foreach (maxdb_fetch_lengths($result) as $i => $val) {
printf("Field %2d has Length %2d\n", $i+1, $val);
}
maxdb_free_result($result);
}
/* close connection */
maxdb_close($link);
?>
以上例程的输出类似于：
Field 1 has Length 4 Field 2 has Length 3 Field 3 has Length 5 Field 4 has Length 6 Field 5 has Length 5 Field 6 has Length 21