INSERT INTO两个不同的表，但具有相同的ID？

Question

I have a database of Users and another table for Teachers. Teachers have all the properties as a user but also an e-mail address. When inserting into the DB how can I insert the info, ensuring that the ID is the same for both?

the ID currently is on automatic incrament.

this is what I have at the moment:

$sqlQuery="INSERT INTO user(firstName,lastName,DOB,title,password,classRoomID) 
    VALUES('$myFirstName','$myLastName','$myDOB','$myTitle','$newPassword','$myClassRoom')";
    $result=mysql_query($sqlQuery);

$sqlQuery = "INSERT INTO teacher(email) VALUES ('$myEmail')";
$result=mysql_query($sqlQuery);

thank you!

Answer 1

使用MYSQL函数LAST_INSERT_ID（）或php mysql http://ro1.php.net/manual/en/function.mysql-insert-id.php

Answer 2

Try this:

$sqlQuery="INSERT INTO user(firstName,lastName,DOB,title,password,classRoomID) 
    VALUES('$myFirstName','$myLastName','$myDOB','$myTitle','$newPassword','$myClassRoom')";
    $result=mysql_query($sqlQuery);

    $id = mysql_insert_id();

$sqlQuery = "INSERT INTO teacher(id, email) VALUES (' $id ','$myEmail')";
$result=mysql_query($sqlQuery);

Answer 3

After the first insert, fetch the last inserted id:

$last_id = mysqli_insert_id(); // or mysql_insert_id() if you're using old code

Or you could expand your second query and use mysql's integrated LAST_INSERT_ID() function:

$sqlQuery = "INSERT INTO teacher(id, email) VALUES ((SELECT LAST_INSERT_ID()), '$myEmail')";

Answer 4

why to use separate table for teachers. instead, you can have email field with in user table and additional field with flag (T ( for teacher) and U (for user). Default can be a U. This have following Pros.

1. Will Not increase table size as email would be varchar
2. Remove extra overhead of maintaining two tables.
3. Same Id can be used

If you want to have that as separate table then answer you selected is good one but make sure last insert id is called in same connection call.

Answer 5

Though you can use the LAST_INSERT_ID() function in order to get the last insert id, the best approach in this case is to create a column reference to user id table.

teacher

id | user_id | email

So the teacher.id could be anyting, but the user_id column is the real reference to user table.

If you use InnoDB table, you can make the database consistent using Foreign keys