Java SQL. Inserting into a table with two primary keys

Question

I have a problem with these blocks of code. I think its a SQL problem I am having. This code is supposed to create a student table and insert data from my android application into the student table. I am getting a error saying the courseid column doesn't exist. I think the problem has to do with courseid being declared a primary key in my course table.

Creating Course table:

  public static String createTable(){
    return "CREATE TABLE " + DbSchema.TABLE_Course  + "("
            + DbSchema.KEY_CourseId  + " PRIMARY KEY    ,"
            + DbSchema.KEY_Name_Course + " TEXT )";
}

Creating Student table:

public static String createTable(){
    return "CREATE TABLE " + DbSchema.TABLE_Student  + "("
            + DbSchema.KEY_StudID  + " PRIMARY KEY  ,"
            + DbSchema.KEY_Name_Student + " TEXT, "
            + DbSchema.KEY_Year_Student + " TEXT, "
            + DbSchema.KEY_Email_Student+ " TEXT,"
            + DbSchema.KEY_CourseId+" TEXT )";
}

Inserting into table:

public void insert(Student student) {


    SQLiteDatabase db = DatabaseManager.getInstance().openDatabase();
    ContentValues values = new ContentValues();
    values.put(DbSchema.KEY_StudID, student.getid());
    values.put(DbSchema.KEY_Name_Student, student.getname());
    values.put(DbSchema.KEY_Year_Student, student.getYear());
    values.put(DbSchema.KEY_Email_Student, student.getEmail());
    values.put(DbSchema.KEY_CourseId, student.getCourseid());




    db.insert(DbSchema.TABLE_Student, null, values);
    DatabaseManager.getInstance().closeDatabase();

Create Table command:

   public DBHelper( ) {
    super(App.getContext(), DATABASE_NAME, null, DATABASE_VERSION);
}

@Override
public void onCreate(SQLiteDatabase db) {
    //All necessary tables you like to create will create here
    db.execSQL(CourseDbCommands.createTable());
    db.execSQL(StudentDbCommands.createTable());

Answer 1

There is no space between DbSchema.TABLE_Course + "(" and DbSchema.KEY_CourseId + "PRIMARY KEY

Student table as also have same spacing problem.

DbSchema.TABLE_Student  + "("

or

check that student course id already exist on the course table

Answer 2

I don't see any foreign key reference in your student table creation command. for reference, you can check this enter link description here

I also assume you already have some entry in course table to map with student table. ie before you insert a student with a particular course in student table that course should be present in course table.

Answer 3

I figured it out I had to change the version of my database manually. I thought changes automatically happened.

Answer 4

I think your have missed INTEGER in your declaration

   public static String createTable(){
        return "CREATE TABLE " + DbSchema.TABLE_Student  + "("
                + DbSchema.KEY_StudID  + " INTEGER PRIMARY KEY  ,"
                + DbSchema.KEY_Name_Student + " TEXT, "
                + DbSchema.KEY_Year_Student + " TEXT, "
                + DbSchema.KEY_Email_Student+ " TEXT,"
                + DbSchema.KEY_CourseId+" TEXT )";
    }