(PHP 4, PHP 5)
mysql_insert_id — 取得上一条查询生成的 ID
本扩展自 PHP 5.5.0 起已废弃,并在自 PHP 7.0.0 开始被移除。应使用 MySQLi 或 PDO_MySQL 扩展来替换之。参见 MySQL:选择 API 指南来获取更多信息。用以替代本函数的有:
检索通过之前查询(通常是 INSERT)中 AUTO_INCREMENT 列生成的 ID。
link_identifier
MySQL
连接。如不指定连接标识,则使用由 mysql_connect()
最近打开的连接。如果没有找到该连接,会尝试不带参数调用
mysql_connect()
来创建。如没有找到连接或无法建立连接,则会生成
E_WARNING
级别的错误。
成功时返回通过之前查询中 AUTO_INCREMENT 列生成的 ID,如果之前查询没有生成 AUTO_INCREMENT
值,则为 0
。如果没有建立 MySQL 连接,则为 false
。
示例 #1 mysql_insert_id() 示例
<?php
$link = mysql_connect('localhost', 'mysql_user', 'mysql_password');
if (!$link) {
die('Could not connect: ' . mysql_error());
}
mysql_select_db('mydb');
mysql_query("INSERT INTO mytable (product) values ('kossu')");
printf("Last inserted record has id %d\n", mysql_insert_id());
?>
mysql_insert_id() will convert the return type of the
native MySQL C API function mysql_insert_id()
to a type
of long
(named int in PHP). If your
AUTO_INCREMENT column has a column type of BIGINT (64 bits) the
conversion may result in an incorrect value. Instead, use the internal
MySQL SQL function LAST_INSERT_ID() in an SQL query. For more information
about PHP's maximum integer values, please see the
integer documentation.
注意:
Because mysql_insert_id() acts on the last performed query, be sure to call mysql_insert_id() immediately after the query that generates the value.
注意:
The value of the MySQL SQL function
LAST_INSERT_ID()
always contains the most recently generated AUTO_INCREMENT value, and is not reset between queries.