为什么Android SQLite中无法识别数据库？

Question

我正在制作一个应用程序地图与SQLite连接有标记，但是有一个错误，数据库无法识别，为什么会发生？有谁能够帮我？这是我的代码：

MaBase.java

public class MaBase  extends SQLiteOpenHelper {

    private static final String TABLE_MARK  ="marker.db";
    private static final String COL_ID = "ID";
    private static final String COL_LONG = "LONGITUDE";
    private static final String COL_LAT = "LATITUDE";


    private static final String CREATE_BDD = "CREATE TABLE " + TABLE_MARK  + " ("
    + COL_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + COL_LONG + " TEXT NOT NULL, " +COL_LAT+" TEXT NOT NULL);";






    public MaBase (Context context, String name, CursorFactory factory, int version) {
        super(context, name, factory, version);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        //on créé la table à partir de la requête écrite dans la variable CREATE_BDD
        db.execSQL(CREATE_BDD);

    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

        db.execSQL("DROP TABLE " + TABLE_MARK + ";");
        onCreate(db);
    }

}

MainActivity.java

public class MainActivity extends Activity {

    private static final String NOM_BDD = "marker.db";
    private static final String TABLE_GEOPOINT = "geopoint";
    private static final String COL_ID = "ID";
    private static final String COL_LONG = "LONGITUDE";
    private static final String COL_LAT = "LATITUDE";

    static final LatLng BOGOR = new LatLng(-6.604346, 106.796642);
    private GoogleMap map;

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

        sauver_point();  
        map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map))
                .getMap();

        MaBase maBaseSQLite = new MaBase(MainActivity.this, NOM_BDD, null, 1);
        SQLiteDatabase db = maBaseSQLite.getWritableDatabase();
        Cursor c = db.query(TABLE_GEOPOINT, new String[] { COL_ID, COL_LONG,
                COL_LAT }, null, null, null, null, null, null);
        int col = c.getCount(); // col=0 pas de enregistrement qui verifie la
        // condition
        if (col == 0) {
            Toast.makeText(MainActivity.this, "Pas de donnees ",
                    Toast.LENGTH_LONG).show();


        } else {
            c.moveToFirst();
            while (c.isAfterLast() == false) {
                // conversion int to string casting
                String id = "" + c.getInt(0);
                String longitude = c.getString(1);
                String latitude = c.getString(2);
                Marker marker = map.addMarker(new MarkerOptions()
                .position(
                        new LatLng(Double.parseDouble(latitude),
                                Double.parseDouble(longitude)))
                                .title("Bonjour Tunis")
                                .icon(BitmapDescriptorFactory
                                        .fromResource(R.drawable.mark2)));
                c.moveToNext();
            }
        }
        c.close();
        db.close();

        map.moveCamera(CameraUpdateFactory.newLatLngZoom(BOGOR, 12.0f));

        // Zoom in, animating the camera.
        map.animateCamera(CameraUpdateFactory.zoomTo(10), 2000, null);
        map.setMapType(GoogleMap.MAP_TYPE_NORMAL);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

    void sauver_point() {
        MaBase maBaseSQLite = new MaBase(MainActivity.this, NOM_BDD, null, 1);
        SQLiteDatabase db = maBaseSQLite.getWritableDatabase();
        ContentValues values = new ContentValues();
        // values.put(COL_ID , "1");
        values.put(COL_LAT, "36.830722");
        values.put(COL_LONG, "10.165672");

        db.insert(TABLE_GEOPOINT, null, values);

        // creer un autre utilisateur

        values = new ContentValues();
        values.put(COL_LAT , "36.830922");
        values.put(COL_LONG, "10.275572");
        db.insert(TABLE_GEOPOINT, null, values);

        values = new ContentValues();
        values.put(COL_LAT, "36.930522");
        values.put(COL_LONG, "10.385572");
        db.insert(TABLE_GEOPOINT, null, values);
        values = new ContentValues();

        values.put(COL_LAT, "36.750422");
        values.put(COL_LONG, "10.495572");
        db.insert(TABLE_GEOPOINT, null, values);


        values.put(COL_LAT, "36.936422");
        values.put(COL_LONG, "11.495572");
        db.insert(TABLE_GEOPOINT, null, values);

        values.put(COL_LAT, "36.990422");
        values.put(COL_LONG, "9.995572");
        db.insert(TABLE_GEOPOINT, null, values);

        db.close();

    }

}

logcat的

02-12 02:56:00.075: E/SQLiteLog(3453): (1) unknown database marker
02-12 02:56:00.075: D/AndroidRuntime(3453): Shutting down VM
02-12 02:56:00.075: W/dalvikvm(3453): threadid=1: thread exiting with uncaught exception (group=0xa6195908)
02-12 02:56:00.075: E/AndroidRuntime(3453): FATAL EXCEPTION: main
02-12 02:56:00.075: E/AndroidRuntime(3453): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.bongkorr/com.bongkorr.maps.MainActivity}: android.database.sqlite.SQLiteException: unknown database marker (code 1): , while compiling: CREATE TABLE marker.db (ID INTEGER PRIMARY KEY AUTOINCREMENT, LONGITUDE TEXT NOT NULL, LATITUDE TEXT NOT NULL);
02-12 02:56:00.075: E/AndroidRuntime(3453):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
02-12 02:56:00.075: E/AndroidRuntime(3453):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
02-12 02:56:00.075: E/AndroidRuntime(3453):     at android.app.ActivityThread.access$600(ActivityThread.java:141)
02-12 02:56:00.075: E/AndroidRuntime(3453):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
02-12 02:56:00.075: E/AndroidRuntime(3453):     at android.os.Handler.dispatchMessage(Handler.java:99)
02-12 02:56:00.075: E/AndroidRuntime(3453):     at android.os.Looper.loop(Looper.java:137)
02-12 02:56:00.075: E/AndroidRuntime(3453):     at android.app.ActivityThread.main(ActivityThread.java:5041)
02-12 02:56:00.075: E/AndroidRuntime(3453):     at java.lang.reflect.Method.invokeNative(Native Method)
02-12 02:56:00.075: E/AndroidRuntime(3453):     at java.lang.reflect.Method.invoke(Method.java:511)
02-12 02:56:00.075: E/AndroidRuntime(3453):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
02-12 02:56:00.075: E/AndroidRuntime(3453):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
02-12 02:56:00.075: E/AndroidRuntime(3453):     at dalvik.system.NativeStart.main(Native Method)
02-12 02:56:00.075: E/AndroidRuntime(3453): Caused by: android.database.sqlite.SQLiteException: unknown database marker (code 1): , while compiling: CREATE TABLE marker.db (ID INTEGER PRIMARY KEY AUTOINCREMENT, LONGITUDE TEXT NOT NULL, LATITUDE TEXT NOT NULL);
02-12 02:56:00.075: E/AndroidRuntime(3453):     at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
02-12 02:56:00.075: E/AndroidRuntime(3453):     at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:882)
02-12 02:56:00.075: E/AndroidRuntime(3453):     at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:493)
02-12 02:56:00.075: E/AndroidRuntime(3453):     at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
02-12 02:56:00.075: E/AndroidRuntime(3453):     at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
02-12 02:56:00.075: E/AndroidRuntime(3453):     at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
02-12 02:56:00.075: E/AndroidRuntime(3453):     at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1663)
02-12 02:56:00.075: E/AndroidRuntime(3453):     at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1594)
02-12 02:56:00.075: E/AndroidRuntime(3453):     at com.bongkorr.maps.MaBase.onCreate(MaBase.java:31)
02-12 02:56:00.075: E/AndroidRuntime(3453):     at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:252)
02-12 02:56:00.075: E/AndroidRuntime(3453):     at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164)
02-12 02:56:00.075: E/AndroidRuntime(3453):     at com.bongkorr.maps.MainActivity.sauver_point(MainActivity.java:86)
02-12 02:56:00.075: E/AndroidRuntime(3453):     at com.bongkorr.maps.MainActivity.onCreate(MainActivity.java:35)
02-12 02:56:00.075: E/AndroidRuntime(3453):     at android.app.Activity.performCreate(Activity.java:5104)
02-12 02:56:00.075: E/AndroidRuntime(3453):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
02-12 02:56:00.075: E/AndroidRuntime(3453):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)

Answer 1

marker.db作为表名会告诉您在数据库db中查找表名marker并且您没有附加数据库marker。

将表格名称用"marker.db"等双引号写成，或者更好的是，将表格重命名为更适合您放置的内容，而不是.。

Answer 2

Marker.db应该是数据库的名称，您应该在构造函数中传递它。您的表格名称应为Marker：

public class MaBase  extends SQLiteOpenHelper {
private static final String DB_MARK  ="marker.db";
private static final String TABLE_MARK  ="marker";
private static final String COL_ID = "ID";
private static final String COL_LONG = "LONGITUDE";
private static final String COL_LAT = "LATITUDE";


private static final String CREATE_BDD = "CREATE TABLE " + TABLE_MARK  + " ("
+ COL_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + COL_LONG + " TEXT NOT NULL, " +COL_LAT+" TEXT NOT NULL);";






public MaBase (Context context, String name, CursorFactory factory, int version) {
    super(context, DB_MARK, factory, version);
}

@Override
public void onCreate(SQLiteDatabase db) {
    //on créé la table à partir de la requête écrite dans la variable CREATE_BDD
    db.execSQL(CREATE_BDD);

}

...