Question

public class DBController extends SQLiteOpenHelper  {

    private static final String LOGCAT=null;
    SharedPreferences sp;

    public DBController(Context applicationcontext) {
        super(applicationcontext, "school.db", null, 1);
        Log.d(LOGCAT, "Created");
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db = this.getWritableDatabase();
        String query,query1,query2;
        query="CREATE TABLE Teachers(Name TEXT, E_Mail VARCHAR, Password VARCHAR, Mob_No TEXT, Department TEXT)";
        query1="CREATE TABLE Students(Roll_No VARCHAR ,Name TEXT, E_Mail VARCHAR, Semester INTEGER, Mob_No TEXT, Department TEXT)";
        query2="CREATE TABLE Classes1(E_Mail VARCHAR, Assign_class VARCHAR)";
        //    query1="CREATE TABLE Subjects(Branch_Name TEXT ,Branch_Code VARCHAR, Semester INTEGER, Sub_Name VARCHAR, Sub_Code VARCHAR, Type TEXT)";
        db.execSQL(query);
        db.execSQL(query1);
        db.execSQL(query2);
        Log.d(LOGCAT, "Teachers Created");
    }

显示没有这样的表存在。课程1 ..请明确我的疑问

Answer 1

asi se crea las tablas xml en android studio

 <string name="db_v1">
    CREATE TABLE tbl_Lista(
          listaId INTEGER NOT NULL,
         nombre TEXT NOT NULL,
    PRIMARY KEY(listaId)
    );


   CREATE TABLE tbl_Item(
    itemId INTEGER NOT NULL,
    descripcion TEXT NOT NULL,
    checked INTEGER NOT NULL,
    listasId INTEGER NOT NULL,
 PRIMARY KEY(itemId)
    );
 FOREIGN  KEY (listasId)REFERENCES tbl_Lista(listaId)
</string>

E / SQLiteLog：（1）没有这样的表：Classes1

1 个答案: