3

我有一个数据库，它已经包含一个表“LocalLogin”，并且设置正确，可以毫无问题地查询，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，出现错误

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

尽管我在 SQLiteOpenHelper 类的 onCreate 方法中执行了一个创建查询，但它给了我一个从未创建表的想法。与 LocalLogin 具有相同的数据库名称是可能的问题吗？

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);
}

}

在我的活动课上：

private GoingOutPersonListDbAdapter mPersonListDbHelper;

...

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

...

//loginEditText is properly set
Cursor personList = mPersonListDbHelper.searchPerson(GoingOutPersonListDbAdapter.PERSONLIST_LOGIN + " = '" + loginEditText + "'");
startManagingCursor(personList);
4

2 回答 2

5

If you're adding a new table, you need to increment your database version so onUpdate will fire and your database will be recreated with the new table.

于 2012-04-09T20:19:17.030 回答
0

您两次声明“private static final String DATABASE_CREATE”。我很惊讶这个编译，实际上？也就是说，您应该向 db.execSQL(DATABASE_CREATE); 添加一条日志记录语句。调用，看看它是否真的成功。

于 2012-04-09T20:16:16.033 回答