MySQL查询：引用另一个表的最后插入行（仅使用一个php-SQL字符串）

Question

I want to put a new row into the database AND refer to this row in a second table. Does anyone have an idea how to do it (using just one php: mysql_query?).

Starting two queries for this purpose is too risky, because the connection can be lost between them.

Idea:

$sql ="INSERT INTO `tbl_humpahumpa`(`humpa_txt`) VALUES ('Ring Ring Ring Bananafon!'); 
INSERT INTO `tbl_reference_to_humpa`(`humpa_ref_id`) VALUES (' ??? referenceid ??? ');";

Answer 1

mysql_query cannot execute multiple queries at once, You can use SQL Transactions , for example :-

try{
  mysql_query("START TRANSACTION");
  mysql_query("INSERT INTO `tbl_humpahumpa`(`humpa_txt`) VALUES ('Ring Ring Ring Bananafon!')");
  mysql_query("INSERT INTO `tbl_reference_to_humpa`(`humpa_ref_id`) VALUES ('".mysqli_insert_id()."')");
  mysql_query("COMMIT;")
} catch (Exception $e) {
  mysql_query("ROLLBACK;");
}

or mysqli_multi_query

Answer 2

$sql = "INSERT INTO `tbl_humpahumpa`(`humpa_txt`) VALUES ('Ring Ring Ring Bananafon!');
INSERT INTO `tbl_reference_to_humpa`(`humpa_ref_id`) VALUES (LAST_INSERT_ID());"; // Done

MySQL provides a function called LAST_INSERT_ID() that returns the last auto_increment ID for the current session. http://dev.mysql.com/doc/refman/5.0/en/information-functions.html#function_last-insert-id