Android，多表，SQLite數據庫

Question

我在Android OS中有SQLite數據庫的另一個問題。 我試圖創建兩個表的數據庫：部門和學生。 Departments表包含：dep_id，dep_name和dep_major。 學生表包含：stud_id，dep_id，名字，姓氏，電子郵件，電話。

如何將數據放入這兩個表中？

有一個Databasehandler.java：

public class DatabaseHandler extends SQLiteOpenHelper { 

private static final int DATABASE_VERSION = 2; 
private static final String TAG = "DatabaseHandler"; 
private static final String DATABASE_NAME = "studentsManager2.db"; 

// pola tabeli "wydzial" 
private static final String TABLE_DEPARTMENTS = "departments", 
     KEY_DEP_ID = "id", 
     KEY_DEPARTMENT = "wydzial", 
     KEY_SPECIALIZATION = "kierunek"; 
// pola tabeli "students" 
private static final String TABLE_STUDENTS = "students", 
     KEY_STUD_ID = "id", 
     KEY_ID = KEY_DEP_ID, 
     KEY_FIRSTNAME = "imie", 
     KEY_SURNAME = "nazwisko", 
     KEY_INDEKS = "indeks", 
     KEY_EMAIL = "email", 
     KEY_NUMER = "numer"; 

public DatabaseHandler(Context context) { 
    super(context, DATABASE_NAME, null, DATABASE_VERSION); 
} 

@Override 
public void onCreate(SQLiteDatabase db) { 
    db.execSQL("CREATE TABLE " + TABLE_DEPARTMENTS + "(" + KEY_DEP_ID + " INTEGER PRIMARY KEY AUTOINCREMENT," + KEY_DEPARTMENT + " TEXT NOT NULL," + KEY_SPECIALIZATION + " TEXT NOT NULL)"); 
    db.execSQL("CREATE TABLE " + TABLE_STUDENTS + "(" + KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT," + KEY_FIRSTNAME + " TEXT NOT NULL," + KEY_SURNAME + " TEXT NOT NULL," + KEY_INDEKS + " INTEGER," + KEY_EMAIL + " TEXT NOT NULL," + KEY_NUMER + " TEXT NOT NULL)"); 
} 

@Override 
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
    Log.w(TAG, "Upgrading database from version " + oldVersion + " to " 
      + newVersion + ", which will destroy all old data."); 
    db.execSQL("DROP TABLE IF EXISTS " + TABLE_DEPARTMENTS); 
    db.execSQL("DROP TABLE IF EXISTS " + TABLE_STUDENTS); 
    onCreate(db); 
    } 
} 

Answer 1

下面的方法將插入在SQLite數據庫中的記錄使用Datbase輔助類：

public void insertDataInBothTables() { 

    SQLiteDatabase db = this.getWritableDatabase(); 

    ContentValues valuesForDepartmentTable = new ContentValues(); 
    valuesForDepartmentTable.put(KEY_DEPARTMENT , "name"); 
    valuesForDepartmentTable.put(KEY_SPECIALIZATION , "special"); 

    // insert row 
    long idOfDepart = db.insert(TABLE_DEPARTMENTS, null, valuesForDepartmentTable); 

    ContentValues values = new ContentValues(); 
    values.put(KEY_FIRSTNAME, "first-name"); 
    values.put(KEY_SURNAME, "sur-name"); 
    values.put(KEY_INDEKS , "inserting-data"); 
    values.put(KEY_EMAIL , "inserting-data"); 
    values.put(KEY_NUMER , "inserting-data"); 
    //Parameter to add department id 
    values.put(KEY_WYDZIAL, idOfDepart + ""); 

    // insert row 
    db.insert(TABLE_STUDENTS, null, values); 

}