I´m creating a restApi with PHP over the courses I have studied. When it comes to the database I´m not sure whats the best practise for this problem ->
I have data over the languages each course had, to normalize data I have languages in a separate table and a bridge to connect them.
So one table for Courses, one for Languages and one bridge table to connect them.
CREATE TABLE `Courses`
(`Course_ID` INT(11),
`Education_ID` INT(11),
`CourseName` VARCHAR(100) NOT NULL,
`Points` VARCHAR (5),
`Grade` VARCHAR(3),
PRIMARY KEY (`Course_ID`)
);
CREATE TABLE `Language` (
`Language_ID` INT(11),
`Language` VARCHAR(100) NOT NULL,
`Img_url` VARCHAR (200),
PRIMARY KEY (`Language_ID`)
);
CREATE TABLE `Bridge_language` (
`Course_ID` INT(11) NOT NULL,
`Language_ID` INT(11) NOT NULL,
KEY `PKFK` (`Course_ID`, `Language_ID`)
);
ALTER TABLE Courses MODIFY Course_ID INTEGER AUTO_INCREMENT;
ALTER TABLE Language MODIFY Language_ID INTEGER AUTO_INCREMENT;
When adding a new course, in the SQL I know the id of the languages, (i will have a function in the admin page where you add new languages) then when you create a new course you just click add languages and the id for the language is added.
But what I don't have is the ID for the course which is created with auto_increment. Is there a smart way you with a function/procedure in SQL, can grab the id that auto_increment has generated and use it to add that into the bridge table?
Or do I need to make a query to the database and grab the latest ID and add one and send that into the bridge table?
In MySQL, you can use last_insert_id()
to retrieve the auto-generated id of the last insert
query that you executed. You don't give much details about your code, but the logic is like:
insert into course (education_id, coursename, points, grade)
values (?, ?, ?, ?);
insert into bridge_language (course_id, language_id)
values (last_insert_id(), ?);