1
我在android應用程序上有一個奇怪的問題，我沒有這樣的表格異常，但我確信數據庫存在。對於一些將我重定向到其他帖子在這裏我想補充說，我在我自己的手機上嘗試應用程序不是一個模擬器，這是因爲我在這裏讀了很多問題，談論模擬器上的相同問題。沒有這樣的表格：商品：
任何想法或提示將不勝感激。
活動的有錯誤的代碼：
...
public class chartView extends Activity{
Button editbtm;
Button cleanbtm;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.chart_layout);
editbtm = (Button) findViewById(R.id.editBasketbtm);
cleanbtm = (Button) findViewById(R.id.cleanBasketbtm);
//fletch all goods that should be presented on the text View
dbAdapter goodsfletcher = new dbAdapter(chartView.this);
// goodsfletcher.createGoodsTable();
goodsfletcher.open();
...
德將對DBAdapter類的代碼：
public class dbAdapter {
public static final String KEY_ARTI = "ARTI";
public static final String KEY_PROV = "PROV";
public static final String KEY_CODART = "CODART";
public static final String KEY_PRECBOL ="PRECBOL";
public static final String KEY_QUANT ="QUANT";
private static final String TAG = "DbAdapter";
private DatabaseHelper mDbHelper;
private SQLiteDatabase mDb;
private static final String DATABASE_CREATE = "create table goods (CODART VARCHAR(10) primary key, ARTI varchar(50) not null, PROV varchar(15) not null, PRECBOL FLOAT(6,2) not null, QUANT int not null);";
private static final String DATABASE_NAME = "ketanoBase";
private static final String DATABASE_TABLE = "goods";
private static final int DATABASE_VERSION = 1;
private final Context mCtx;
private static class DatabaseHelper extends SQLiteOpenHelper {
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(DATABASE_CREATE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
+ newVersion + ", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS goods");
onCreate(db);
}
}
public dbAdapter(Context ctx) {
this.mCtx = ctx;
}
public dbAdapter open() throws SQLException {
mDbHelper = new DatabaseHelper(mCtx);
mDb = mDbHelper.getWritableDatabase();
return this;
}
public void close() {
mDbHelper.close();
}
public void addĜood(String code, String title, String source, String quantity, String price ) {
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_ARTI, title);
initialValues.put(KEY_CODART, code);
initialValues.put(KEY_PROV, source);
initialValues.put(KEY_PRECBOL, price);
initialValues.put(KEY_QUANT, quantity);
mDb.insert(DATABASE_TABLE, code, initialValues);
}
public boolean deleteGood(long rowId) {
return mDb.delete(DATABASE_TABLE, KEY_CODART + "=" + rowId, null) > 0;
}
public void eraseGoods(){
String sql = "drop table if exists goods";
mDb.execSQL(sql);
}
public Cursor fetchAllGoods() {
return mDb.query(DATABASE_TABLE, new String[] {KEY_CODART, KEY_ARTI,
KEY_PROV, KEY_PRECBOL, KEY_QUANT}, null, null, null, null, null);
}
public Cursor fetchGood(long rowId) throws SQLException {
Cursor mCursor =
mDb.query(true, DATABASE_TABLE, new String[] {KEY_CODART,
KEY_ARTI, KEY_PROV,KEY_PRECBOL, KEY_QUANT}, KEY_CODART + "=" + rowId, null,
null, null, null, null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
public boolean updateGood(long rowId, String quantity) {
ContentValues args = new ContentValues();
args.put(KEY_QUANT,quantity);
return mDb.update(DATABASE_TABLE, args, KEY_CODART + "=" + rowId, null) > 0;
}
}
OG錯誤的logcat的：
03-14 09:52:05.668: W/KeyCharacterMap(30808): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
03-14 09:52:06.384: D/AndroidRuntime(30808): Shutting down VM
03-14 09:52:06.384: W/dalvikvm(30808): threadid=1: thread exiting with uncaught exception (group=0x40018560)
03-14 09:52:06.394: E/AndroidRuntime(30808): FATAL EXCEPTION: main
03-14 09:52:06.394: E/AndroidRuntime(30808): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.remotedata.firstapp/com.remotedata.firstapp.chartView}: android.database.sqlite.SQLiteException: no such table: goods: , while compiling: SELECT CODART, ARTI, PROV, PRECBOL, QUANT FROM goods
03-14 09:52:06.394: E/AndroidRuntime(30808): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1768)
03-14 09:52:06.394: E/AndroidRuntime(30808): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1784)
03-14 09:52:06.394: E/AndroidRuntime(30808): at android.app.ActivityThread.access$1500(ActivityThread.java:123)
03-14 09:52:06.394: E/AndroidRuntime(30808): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:939)
03-14 09:52:06.394: E/AndroidRuntime(30808): at android.os.Handler.dispatchMessage(Handler.java:99)
03-14 09:52:06.394: E/AndroidRuntime(30808): at android.os.Looper.loop(Looper.java:130)
03-14 09:52:06.394: E/AndroidRuntime(30808): at android.app.ActivityThread.main(ActivityThread.java:3835)
03-14 09:52:06.394: E/AndroidRuntime(30808): at java.lang.reflect.Method.invokeNative(Native Method)
03-14 09:52:06.394: E/AndroidRuntime(30808): at java.lang.reflect.Method.invoke(Method.java:507)
03-14 09:52:06.394: E/AndroidRuntime(30808): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:864)
03-14 09:52:06.394: E/AndroidRuntime(30808): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:622)
03-14 09:52:06.394: E/AndroidRuntime(30808): at dalvik.system.NativeStart.main(Native Method)
03-14 09:52:06.394: E/AndroidRuntime(30808): Caused by: android.database.sqlite.SQLiteException: no such table: goods: , while compiling: SELECT CODART, ARTI, PROV, PRECBOL, QUANT FROM goods
03-14 09:52:06.394: E/AndroidRuntime(30808): at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
03-14 09:52:06.394: E/AndroidRuntime(30808): at android.database.sqlite.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:92)
03-14 09:52:06.394: E/AndroidRuntime(30808): at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:65)
03-14 09:52:06.394: E/AndroidRuntime(30808): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:83)
03-14 09:52:06.394: E/AndroidRuntime(30808): at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:49)
03-14 09:52:06.394: E/AndroidRuntime(30808): at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:42)
03-14 09:52:06.394: E/AndroidRuntime(30808): at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1356)
03-14 09:52:06.394: E/AndroidRuntime(30808): at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1235)
03-14 09:52:06.394: E/AndroidRuntime(30808): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1189)
03-14 09:52:06.394: E/AndroidRuntime(30808): at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1271)
03-14 09:52:06.394: E/AndroidRuntime(30808): at com.remotedata.firstapp.dbAdapter.fetchAllGoods(dbAdapter.java:138)
03-14 09:52:06.394: E/AndroidRuntime(30808): at com.remotedata.firstapp.chartView.onCreate(chartView.java:31)
03-14 09:52:06.394: E/AndroidRuntime(30808): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
03-14 09:52:06.394: E/AndroidRuntime(30808): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1722)
03-14 09:52:06.394: E/AndroidRuntime(30808): ... 11 more
該表尚未創建。你對SQLiteOpenHelper的使用在某種程度上是錯誤的 – zapl 2012-03-14 13:45:40
因此，如果我在類的onCreate方法上創建它，表是不會被創建的？ – 2012-03-14 13:51:03
嗯，你在構造函數中訪問數據庫，並在oncreate中創建它。我也會說當你創建一個DatabaseHelper對象時，數據庫還沒有被創建。 – dan 2012-03-14 14:07:14