Question

我尝试使用sqlite在我的数据库中创建3个表，我通过抽屉导航在片段之间导航， DVD表适用于CD表我有一个错误：引起：SQL（查询）错误或丢失数据库。（没有这样的表：CD（代码1）:,编译时：SELECT * FROM CD）

 dbhelper = new SQLiteOpenHelper(getActivity(), "abbes5.db", null, 1) {
        @Override
        public void onCreate(SQLiteDatabase db) {
            db.execSQL("Create table DVD (_id INTEGER PRIMARY KEY NOT NULL , nom TEXT )");
            db.execSQL("Create table CD (_id INTEGER PRIMARY KEY NOT NULL , nom TEXT )");
            db.execSQL("Create table Livre (_id INTEGER PRIMARY KEY NOT NULL , nom TEXT )");

        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

        }
    };

Fragment dvd

 public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment2, container, false);

    dbhelper = new SQLiteOpenHelper(getActivity(),"abbes5.db", null, 1) {
        @Override
        public void onCreate(SQLiteDatabase db) {
            db.execSQL("Create table DVD (_id INTEGER PRIMARY KEY NOT NULL , nom TEXT)");


        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {


        }
    };
    listview= (ListView) rootView.findViewById(R.id.listView);
    recherche =  (EditText) rootView.findViewById(R.id.recherche);



    db = dbhelper.getReadableDatabase();
    Cursor c = db.rawQuery("SELECT * FROM DVD",null);
    if(c.moveToFirst()){
        c.moveToFirst();
        String[] columns = new String[]{
                "nom"
        };

片段CD

  dbhelper = new SQLiteOpenHelper(getActivity(),"abbes5.db", null, 1) {
        @Override
        public void onCreate(SQLiteDatabase db) {
            db.execSQL("Create table CD (_id INTEGER PRIMARY KEY NOT NULL , nom TEXT)");
        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {


        }
    };
    listview1= (ListView) rootView.findViewById(R.id.listView1);
    recherche1 =  (EditText) rootView.findViewById(R.id.recherche1);



    db = dbhelper.getReadableDatabase();
    Cursor c = db.rawQuery("SELECT * FROM CD", null);
    if(c.moveToFirst()){
        c.moveToFirst();
        String[] columns = new String[]{
                "nom"
        };

Answer 1

使用类似的东西

db.query("CD",rest of all parameter null);

这将像您查询一样工作

使用sqlite创建多个表

1 个答案: