我有一个应用程序，它接收动物的id并将该id传递给数据库中的方法，该方法将在do-while中多次读取。我想知道为什么会发生这种错误？
这是我的代码：
bd = new BaseDados(getApplicationContext());
Cursor cc = bd.getIdAnimal(chipnumber);
if (cc.moveToFirst()) {
idanimal = cc.getInt(cc.getColumnIndex("idanimal"));
}
Cursor ccc = bd.getGruupsnosAnimals(idanimal);
do{
if(ccc.moveToFirst()){
String groupname= ccc.getString(ccc.getColumnIndex("groupname"));
}
}while (ccc.moveToNext());
这是我的错误：
Process: com.example.nobre.myapplication, PID: 4529
android.database.sqlite.SQLiteException: not an error (code 0)
at android.database.sqlite.SQLiteConnection.nativeExecuteForCursorWindow(Native Method)
at android.database.sqlite.SQLiteConnection.executeForCursorWindow(SQLiteConnection.java:845)
at android.database.sqlite.SQLiteSession.executeForCursorWindow(SQLiteSession.java:836)
at android.database.sqlite.SQLiteQuery.fillWindow(SQLiteQuery.java:62)
at android.database.sqlite.SQLiteCursor.fillWindow(SQLiteCursor.java:144)
at android.database.sqlite.SQLiteCursor.getCount(SQLiteCursor.java:133)
at android.database.AbstractCursor.moveToPosition(AbstractCursor.java:197)
at android.database.AbstractCursor.moveToFirst(AbstractCursor.java:237)
at com.example.nobre.myapplication.Activities.VerAnimaisActivity.showDialog(VerAnimaisActivity.java:193)
at com.example.nobre.myapplication.Activities.VerAnimaisActivity$2.onClick(VerAnimaisActivity.java:153)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
答案 0 :(得分：1)
异常：不是错误？那是一个新的。
你的底部循环有点奇怪，可能是一个错误 - 你正在向下一个移动，但如果失败，甚至可能没有移动到第一个。如果成功，你将无限循环。试试这个：
if(ccc.moveToFirst()){
do{
String groupname= ccc.getString(ccc.getColumnIndex("groupname"));
}while (ccc.moveToNext());
}
答案 1 :(得分：1)
private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
@Override
public void onManagerConnected(int status) {
switch (status) {
case LoaderCallbackInterface.SUCCESS:
{
Log.i("OpenCv", "OpenCV loaded successfully");
mOpenCvCameraView.enableView();
} break;
default:
{
super.onManagerConnected(status);
} break;
}
}
};
@Override
public void onResume()
{
super.onResume();
if (!OpenCVLoader.initDebug()) {
Log.d("OpenCv", "Internal OpenCV library not found. Using OpenCV Manager for initialization");
OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_11, this, mLoaderCallback);
} else {
Log.d("OpenCv", "OpenCV library found inside package. Using it!");
mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera);
mOpenCvCameraView = (CameraBridgeViewBase) findViewById(R.id.tutorial1_activity_java_surface_view);
mOpenCvCameraView.setMaxFrameSize(720,1280);
mOpenCvCameraView.setVisibility(SurfaceView.VISIBLE);
mOpenCvCameraView.setCvCameraViewListener(this);
}
@Override
public void onCameraViewStarted(int width, int height) {
// Recieve Image Data when the caera preview starts
mRgba = new Mat(height, width, CvType.CV_8UC4);
mRgbaT = new Mat(height, width, CvType.CV_8UC4);
mRgbaF = new Mat(height, width, CvType.CV_8UC4);
//End
mSpectrum = new Mat();
mBlobColorRgba = new Scalar(255);
mBlobColorHsv = new Scalar(255);
SPECTRUM_SIZE = new Size(400, 400);
CONTOUR_COLOR = new Scalar(255,0,0,255);
}
@Override
public void onCameraViewStopped() {
mRgba.release();
}
@Override
public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
timeofFrame = System.currentTimeMillis();
mRgba = inputFrame.rgba();
Core.transpose(mRgba,mRgbaT);
//Rotate 90 degrees//
Imgproc.resize(mRgbaT,mRgbaF,mRgbaF.size(),0,0,0);
Core.flip(mRgbaF,mRgba,1);
return mRgba;
}
}
这是一个无限循环，当你在光标中有下一个项目时，你移动到第一个项目，下一个迭代你将再次移动到第一个项目。
另外，请不要忘记在使用后拨打do{
if(ccc.moveToFirst()){
String groupname= ccc.getString(ccc.getColumnIndex("groupname"));
}
}while (ccc.moveToNext());
。
答案 2 :(得分：-1)
试试这个：
// Move the cursor to the first row if cursor is not empty
if(ccc.moveToFirst()) {
do{
String groupname= ccc.getString(ccc.getColumnIndex("groupname"));
}while (ccc.moveToNext()); // Move cursor to next row until it pass last entry
}
代替：
do{
if(ccc.moveToFirst()) {
String groupname= ccc.getString(ccc.getColumnIndex("groupname"));
}
}while (ccc.moveToNext());