数据无法插入android studio中的数据库

Question

我正在编写一个程序，该程序从用户那里获取插入的数据并将其插入到sql数据库中。

我编写了这段代码，将输入的数据插入数据库。但是无法插入数据。吐司豆说：“数据已成功保存”，但是我找不到数据。

这是mainActivity.java：

public class MainActivity extends AppCompatActivity {

EditText edtId, edtName, edtFamily;
Button btnInsert, btnView, btnUpdate, btnDelete;
DatabaseManager dbm;
TextView txtCount;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    edtId = (EditText) findViewById(R.id.editId);
    edtName = (EditText) findViewById(R.id.editName);
    edtFamily = (EditText) findViewById(R.id.editFamily);
    btnInsert = (Button) findViewById(R.id.buttonSave);
    btnView = (Button) findViewById(R.id.buttonView);
    btnUpdate = (Button) findViewById(R.id.buttonUpdate);
    btnDelete = (Button) findViewById(R.id.buttonDelete);
    dbm = new DatabaseManager(this);
    txtCount = (TextView) findViewById(R.id.text_count);

    btnInsert.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            String mId = edtId.getText().toString();
            String mName = edtName.getText().toString();
            String mFamily = edtFamily.getText().toString();
            dbm.insertPerson(mId,mName,mFamily);

            if (TextUtils.isEmpty(mId) || TextUtils.isEmpty(mName) || TextUtils.isEmpty(mFamily)) {
                Toast.makeText(MainActivity.this,"complete all fields", Toast.LENGTH_LONG).show();
            } else {
                Toast.makeText(MainActivity.this, "data has been saved succesfully!", Toast.LENGTH_LONG).show();
            }
        }


    });

这是数据库代码：

public class DatabaseManager extends SQLiteOpenHelper {

private static final String databasename="mydatabase.db";
private static final int databaseVersion=1;
private static final String tableName="mydatabase";
private static final String dId = "id";
private static final String dName ="name";
private static final String dFamiliy ="familiy";

public DatabaseManager( Context context) {
    super(context, databasename, null, databaseVersion);
}


@Override
public void onCreate(SQLiteDatabase db) {

    String cQuery = "CREATE TABLE mydatabase (id     VARCHAR PRIMARY KEY, name   VARCHAR, family VARCHAR)";
    db.execSQL(cQuery);

}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    db.execSQL("DROP TABLE IF EXISTS " + tableName);
    onCreate(db);

}

public boolean insertPerson (String pId,String pName,String pFamily){
    SQLiteDatabase idb=this.getWritableDatabase();
    ContentValues icv = new ContentValues();
    icv.put(dId,pId);
    icv.put(dName,pName);
    icv.put(dFamiliy,pFamily);
    long result= idb.insert(tableName,null,icv);
     if (result==-1)
        return false;
     else
        return true;
}

我该如何解决？