maxdb_num_rows
maxdb::num_rows
(PECL maxdb >= 1.0)
maxdb_num_rows -- maxdb::num_rows — Gets the number of rows in a result
说明
过程化风格
maxdb_num_rows (
resource
$result ) :
int
面向对象风格
int
$maxdb->num_rows;
Returns the number of rows in the result set.
The use of maxdb_num_rows() depends on whether you use buffered or unbuffered result sets. In case you use unbuffered resultsets maxdb_num_rows() will not correct the correct number of rows until all the rows in the result have been retrieved.
返回值
Returns number of rows in the result set.
Note:
If the number of rows is greater than maximal int value, the number will be returned as a string.
范例
Example #1 面向对象风格
<?php
$maxdb = new maxdb("localhost", "MONA", "RED", "DEMODB");
/* check connection */
if (maxdb_connect_errno()) {
printf("Connect failed: %s\n", maxdb_connect_error());
exit();
}
if ($result = $maxdb->query("SELECT cno, name FROM hotel.customer ORDER BY name")) {
/* determine number of rows result set */
$row_cnt = $result->num_rows;
printf("Result set has %d rows.\n", $row_cnt);
/* close result set */
$result->close();
}
/* close connection */
$maxdb->close();
?>
Example #2 过程化风格
<?php
$link = maxdb_connect("localhost", "MONA", "RED", "DEMODB");
/* check connection */
if (maxdb_connect_errno()) {
printf("Connect failed: %s\n", maxdb_connect_error());
exit();
}
if ($result = maxdb_query($link, "SELECT cno, name FROM hotel.customer ORDER BY name")) {
/* determine number of rows result set */
$row_cnt = maxdb_num_rows($result);
printf("Result set has %d rows.\n", $row_cnt);
/* close result set */
maxdb_free_result($result);
}
/* close connection */
maxdb_close($link);
?>
以上例程的输出类似于：
Result set has 15 rows.
参见
- maxdb_affected_rows() - Gets the number of affected rows in a previous MaxDB operation
- maxdb_store_result() - Transfers a result set from the last query
- maxdb_use_result() - Initiate a result set retrieval
- maxdb_query() - Performs a query on the database
