maxdb_affected_rows
maxdb::affected_rows
(PECL maxdb >= 1.0)
maxdb_affected_rows -- maxdb::affected_rows — Gets the number of affected rows in a previous MaxDB operation
說明
程序化風格
$link
)物件導向風格
maxdb_affected_rows() returns the number of rows affected by the last
INSERT, UPDATE, or DELETE query associated with the provided link
parameter. If this number cannot be determined, this function will return -1.
Note:
For SELECT statements maxdb_affected_rows() works like maxdb_num_rows().
The maxdb_affected_rows() function only works with queries which modify a table. In order to return the number of rows from a SELECT query, use the maxdb_num_rows() function instead.
回傳值
An integer greater than zero indicates the number of rows affected or retrieved. Zero indicates that no records where updated for an UPDATE statement, no rows matched the WHERE clause in the query or that no query has yet been executed. -1 indicates that the number of rows affected can not be determined.
範例
Example #1 物件導向風格
<?php
$maxdb = new maxdb("localhost", "MONA", "RED", "DEMODB");
/* check connection */
if (maxdb_connect_errno()) {
printf("Connect failed: %s\n", maxdb_connect_error());
exit();
}
maxdb_report (MAXDB_REPORT_OFF);
$maxdb->query("DROP TABLE mycustomer");
maxdb_report (MAXDB_REPORT_ERROR);
/* Insert rows */
$maxdb->query("CREATE TABLE mycustomer AS SELECT * from hotel.customer");
printf("Affected rows (INSERT): %d\n", $maxdb->affected_rows);
$maxdb->query("ALTER TABLE mycustomer ADD Status int default 0");
/* update rows */
$maxdb->query("UPDATE mycustomer SET Status=1 WHERE cno > 50");
printf("Affected rows (UPDATE): %d\n", $maxdb->affected_rows);
/* delete rows */
$maxdb->query("DELETE FROM mycustomer WHERE cno < 50");
printf("Affected rows (DELETE): %d\n", $maxdb->affected_rows);
/* select all rows */
$result = $maxdb->query("SELECT title FROM mycustomer");
printf("Affected rows (SELECT): %d\n", $maxdb->affected_rows);
$result->close();
/* Delete table Language */
$maxdb->query("DROP TABLE mycustomer");
/* close connection */
$maxdb->close();
?>
Example #2 程序化風格
<?php
$link = maxdb_connect("localhost", "MONA", "RED", "DEMODB");
if (!$link) {
printf("Can't connect to localhost. Error: %s\n", maxdb_connect_error());
exit();
}
maxdb_report (MAXDB_REPORT_OFF);
maxdb_query($link,"DROP TABLE mycustomer");
maxdb_report (MAXDB_REPORT_ERROR);
/* Insert rows */
maxdb_query($link, "CREATE TABLE mycustomer AS SELECT * from hotel.customer");
printf("Affected rows (INSERT): %d\n", maxdb_affected_rows($link));
maxdb_query($link, "ALTER TABLE mycustomer ADD Status int default 0");
/* update rows */
maxdb_query($link, "UPDATE mycustomer SET Status=1 WHERE cno > 50");
printf("Affected rows (UPDATE): %d\n", maxdb_affected_rows($link));
/* delete rows */
maxdb_query($link, "DELETE FROM mycustomer WHERE cno < 50");
printf("Affected rows (DELETE): %d\n", maxdb_affected_rows($link));
/* select all rows */
$result = maxdb_query($link, "SELECT title FROM mycustomer");
printf("Affected rows (SELECT): %d\n", maxdb_affected_rows($link));
maxdb_free_result($result);
/* Delete table Language */
maxdb_query($link, "DROP TABLE mycustomer");
/* close connection */
maxdb_close($link);
?>
上例的輸出類似於：
Affected rows (INSERT): 15 Affected rows (UPDATE): 15 Affected rows (DELETE): 0 Affected rows (SELECT): 15
參見
- maxdb_num_rows() - Gets the number of rows in a result
- maxdb_info() - Retrieves information about the most recently executed query
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