所以我創建了一個數據庫使用SQLiteOpenHelper,我試圖查詢它。它返回遊標,但是當我打電話moveToFirst()它與錯誤SQL Logic Error or Missing Database.
Android SQLiteDatabase查詢SQL邏輯錯誤或丟失的數據庫
我按照這個網站的代碼來創建和查詢我的數據庫崩潰了:http://www.vogella.de/articles/AndroidSQLite/article.html
編輯:
我的數據庫:
public class Database{
private static final String DATABASE_NAME = "MyDatabase";
private static final int DATABASE_VERSION = 1;
private static final String TABLE_NAME = "MyTable";
// Column Names
public static final String ID = "_id"; // INTEGER
public static final String NUMBER = "number"; // TEXT
private SQLiteDatabase database;
private DatabaseHelper mDatabaseOpenHelper;
public Database(Context context){
mDatabaseOpenHelper = new DatabaseHelper(context);
database = mDatabaseOpenHelper.getWritableDatabase();
}
public void close(){
database.close();
}
public long addNumber(String number){
ContentValues values = new ContentValues();
values.put(NUMBER, number);
return database.insert(TABLE_NAME, null, values);
}
public Cursor getNumber(String number){
String selection = NUMBER + " MATCH ?";
String[] selectionArgs = new String[] {number};
return database.query(TABLE_NAME, null, selection, selectionArgs, null, null, null);
}
private class DatabaseHelper extends SQLiteOpenHelper{
private static final String CREATE_TABLE = "CREATE TABLE " + TABLE_NAME + "(_id INTEGER PRIMARY KEY AUTOINCREMENT, " + NUMBER + " TEXT)";
public DatabaseHelper(Context context){
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_TABLE);
}
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
onCreate(db);
}
}
}
而且這是我的查詢:
Database database = new Database(this);
Cursor cursor = database.getTrUpdate("1234");
if (cursor.moveToFirst()){
do{
int d = cursor.getInt(cursor.getColumnIndex(Database.ID));
} while(cursor.moveToNext());
}
你還可以發佈你的DataBaseHelper代碼嗎? – Albinoswordfish 2011-06-02 15:24:01