Question

我有一个数据库已经包含一个表“LocalLogin”并且已经正确设置并且可以毫无问题地查询，其设置方式与我的新表“PersonList”相同。但是，当我尝试在PersonList上执行查询以选择某些值时，我收到错误

android.database.sqlite.SQLiteException: no such table: PersonList: , while compiling: SELECT ...

虽然我在SQLiteOpenHelper类的onCreate方法中执行了一个create查询，但它让我觉得该表从未创建过。与LocalLogin具有相同的数据库名称可能存在问题吗？

以下是相关代码：

数据库适配器类

public class GoingOutPersonListDbAdapter {
private static final String DATABASE_NAME = "GoingOutData";
private static final String DATABASE_TABLE_PERSONLIST = "PersonList";
private static final int DATABASE_VERSION = 1;

public static final String PERSONLIST_ID = "PersonList_id";
public static final String PERSONLIST_LOGIN = "Login";
public static final String PERSONLIST_PASSWORD = "Password";

private static final String TAG = "Debugstring";

private PersonListDatabaseHelper mPersonListDbHelper;
private SQLiteDatabase mDb;

private static final String DATABASE_CREATE = 
    "CREATE Table " + DATABASE_TABLE_PERSONLIST+ " ( "
    + PERSONLIST_ID + " integer PRIMARY KEY Autoincrement, "
    + PERSONLIST_LOGIN + " text NOT NULL,"
    + PERSONLIST_PASSWORD + " text NOT NULL );";

private final Context mCtx;

private static class PersonListDatabaseHelper extends SQLiteOpenHelper {
    PersonListDatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }
    @Override
    public void onCreate(SQLiteDatabase db) {
        Log.d(TAG,DATABASE_CREATE);
        db.execSQL(DATABASE_CREATE);
    }
}

public GoingOutPersonListDbAdapter(Context ctx) {
    this.mCtx = ctx;
}

public GoingOutPersonListDbAdapter open() throws SQLException {
    mPersonListDbHelper = new PersonListDatabaseHelper(mCtx);
    mDb = mPersonListDbHelper.getWritableDatabase();
    return this;
}

public Cursor searchPerson(String searchString) {
    return mDb.query(DATABASE_TABLE_PERSONLIST, new String[] {PERSONLIST_ID, PERSONLIST_LOGIN, PERSONLIST_PASSWORD}, searchString, null, null, null, null);
}

}

在我的活动课程中：

private GoingOutPersonListDbAdapter mPersonListDbHelper;

...

mPersonListDbHelper = new GoingOutPersonListDbAdapter(this);
mPersonListDbHelper.open();

...

//loginEditText is properly set
Cursor personList = mPersonListDbHelper.searchPerson(GoingOutPersonListDbAdapter.PERSONLIST_LOGIN + " = '" + loginEditText + "'");
startManagingCursor(personList);

Answer 1

如果要添加新表，则需要增加数据库版本，以便触发onUpdate，并使用新表重新创建数据库。

Answer 2

您两次声明'private static final String DATABASE_CREATE'。实际上，我很惊讶这个编译？也就是说，您应该将日志语句添加到db.execSQL（DATABASE_CREATE）;打电话，看看它是否真的成功了。

在数据库上执行查询时，Android“android.database.sqlite.SQLiteException：no such table”错误

2 个答案: