我试图在SQLite数据库的表中插入几行，我将这部分代码包含在主活动类中，如下所示：
using (SqlConnection cn = new SqlConnection(_connectionString))
{
cn.Open();
var predicate = Predicates.Field<SomeTable>(f => f.Id, Operator.???, commaSeparatedListOfIDs);
IEnumerable<SomeTable> list = cn.GetList<SomeTable>(predicate);
cn.Close();
}
我使用自定义列表视图来检索学校名称，但是我在运行时遇到错误并且没有添加数据，以下是数据库类：
Operator.InLOG：
public class MainActivity extends AppCompatActivity implements BottomNavigationView.OnNavigationItemSelectedListener {
private TextView mTextMessage;
Intent intent1;
private DrawerLayout d;
private ActionBarDrawerToggle a;
TabLayout tab;
ViewPager vp;
ViewPagerAdapter vpa;
GridLayout mainGrid;
DBAdapter db;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
insertSchools();
d = (DrawerLayout) findViewById(R.id.container);
a= new ActionBarDrawerToggle(MainActivity.this,d,R.string.open,R.string.close);
d.addDrawerListener(a);
a.syncState();
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
intent1= new Intent(getApplicationContext(),MapsActivity.class);
//NavigationView view = (NavigationView) findViewById(R.id.n);
mainGrid = (GridLayout) findViewById(R.id.mainGrid);
//Set Event
setSingleEvent(mainGrid);
//setToggleEvent(mainGrid);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if(a.onOptionsItemSelected(item)){
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
int id = item.getItemId();
if(id == R.id.item1){
startActivity(intent1);
}
if(id==R.id.item2){
Toast.makeText(this,"رأيك يهمنا",Toast.LENGTH_SHORT).show();
}
if(id==R.id.item5){
Toast.makeText(this,"حول التطبيق",Toast.LENGTH_SHORT).show();
}
return false;
}
private void setToggleEvent(GridLayout mainGrid) {
//Loop all child item of Main Grid
for (int i = 0; i < mainGrid.getChildCount(); i++) {
//You can see , all child item is CardView , so we just cast object to CardView
final CardView cardView = (CardView) mainGrid.getChildAt(i);
cardView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (cardView.getCardBackgroundColor().getDefaultColor() == -1) {
//Change background color
cardView.setCardBackgroundColor(Color.parseColor("#FF6F00"));
Toast.makeText(MainActivity.this, "State : True", Toast.LENGTH_SHORT).show();
} else {
//Change background color
cardView.setCardBackgroundColor(Color.parseColor("#FFFFFF"));
Toast.makeText(MainActivity.this, "State : False", Toast.LENGTH_SHORT).show();
}
}
});
}
}
private void setSingleEvent(GridLayout mainGrid) {
//Loop all child item of Main Grid
for (int i = 0; i < mainGrid.getChildCount(); i++) {
//You can see , all child item is CardView , so we just cast object to CardView
CardView cardView = (CardView) mainGrid.getChildAt(i);
final int finalI = i;
cardView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(finalI==0) {
Intent intent = new Intent(MainActivity.this, ListOfSchoolsPublic.class);
startActivity(intent);
}
else if(finalI==1){
Intent intent = new Intent(MainActivity.this,ListOfPrivateSchools.class);
startActivity(intent);
}
}
});
}
}
/////////////////////////////INSERT SCHOOLS//////////////////////////
public void insertSchools(){
//SCHOOL-1
openDB();
db.insertSchool("مدرسة دار المعرفة","0797417018 - 0790889165","Math - Science",2009,"الأول - السابع","عن طريق مستودع التربية","جيدة جدا","مختبر حاسوب - مختبر علوم","480 - 550","اربد/مجمع الشيخ خليل/حي النزهة",35.85542,"خاصة",32.54845);
closeDB();
//SCHOOL-2
openDB();
db.insertSchool("مدرسة الروم الكاثوليك","07272881","فرنسي",1951,"بستان - ثاني ثانوي","الشراء من مستودع التربية","ممتازة","مختبر حاسوب - مختبر علوم - مكتبة - فرقة فن","روضة / 500 | الاول - ثاني ثنوي / 1100","اربد/شارع الحصن/بجانب اسواق مكة",35.85155,"خاصة",32.55172);
closeDB();
//SCHOOL-3
openDB();
db.insertSchool("مدرسة النوار بنت مالك ","لا يوجد","لا يوجد",1970,"لا يوجد","لا يوجد","لا يوجد","لا يوجد","لا يوجد","لا يوجد",35.85391,"حكومية",32.54843);
closeDB();
//SCHOOL-4
openDB();
db.insertSchool("مدرسة زبيدة بنت جعفر الأساسية","لا يوجد","لا يوجد",1970,"الثالث - السابع","لا يوجد","جيدة","لا يوجد","لا يوجد","لا يوجد",35.85316,"خاصة",32.54871);
closeDB();
//SCHOOL-5
openDB();
db.insertSchool("أكاديمية الفرح","027250551 - 0796550752","الغاز عربية للصف الاول - كراسة كتابة وخط - مصطلحات علمية باللغة الانجليزية - Math - Science - منهاج تعليمي الكتروني للرياضيات والعلوم والانجليزي من الصف الخامس للصف التاسع",1994,"الروضة - ثاني ثانوي","لا يوجد","لا يوجد","مختبر حاسوب","اول - سادس / 600 | سابع - تاسع / 700 | عاشر / 750 | اول ثانوي - ثاني ثانوي / 900 | الروضة / 450","اربد/الحي الجنوبي/شمال جامعة اليرموك/جنوب شرق اشارة الاسكان",35.85199,"خاصة",32.54356);
closeDB();
//SCHOOL-6
openDB();
db.insertSchool("مدرسة جمانة الثانوية للبنات","لا يوجد","لا يوجد",1970,"لا يوجد","لا يوجد","لا يوجد","لا يوجد","لا يوجد","لا يوجد",35.85352,"خاصة",32.53322);
closeDB();
//SCHOOL-7
openDB();
db.insertSchool("روضة ومدرسة ابن النفيس","لا يوجد","لا يوجد",1970,"لا يوجد","لا يوجد","لا يوجد","لا يوجد","لا يوجد","لا يوجد",35.85050,"حكومية",32.54680);
closeDB();
//SCHOOL-8
openDB();
db.insertSchool("مدرسة البحرينية","0772062317","لا يوجد",1970,"الأول - العاشر","لا يوجد","جيدة جدا","مختبر علوم - مختبر حاسوب1 - مختبر حاسوب2 - حضانة - حديقة","لا يوجد","اربد/الحي الشرقي/النزهة",35.86408,"حكومية",32.54847);
closeDB();
//SCHOOL-9
openDB();
db.insertSchool("مدرسة القادسية","0795527721","لا يوجد",1981,"لا يوجد","لا يوجد","ممتازة","مختبر حاسوب - مختبر علوم","لا يوجد","اربد/الحي الشرقي",35.86587,"حكومية",32.54785);
closeDB();
//SCHOOL-10
openDB();
db.insertSchool("مدرسة رقية بنت الرسول الأساسية للبنات","لا يوجد","لا يوجد",1970,"لا يوجد","لا يوجد","لا يوجد","لا يوجد","لا يوجد","لا يوجد",35.85827,"خاصة",32.55319);
closeDB();
//SCHOOL-11
openDB();
db.insertSchool("مدرسة الإيمان التعليمية","07277323","Math - Science",1996,"الروضة - التاسع","الشراء من مستودع التربية","ممتازة","لا يوجد","الروضة / 850 | الاول - التاسع /1000","اربد/حي الشيخ خليل/مبنى راتب البطاينة",35.85887,"حكومية",32.54622);
closeDB();
}
/////////////////////////////////////////////////////////////////////
@Override
protected void onDestroy() {
super.onDestroy();
closeDB();
}// end onDestroy method
//////////////////////////////////////////////////////////////////////
private void openDB() {
db = new DBAdapter(this);
db.open();
} // end openDB method
//////////////////////////////////////////////////////////////////////
private void closeDB() {
db.close();
} // end closeDB method
}
我不知道为什么行没有插入数据库，请帮忙！？！阿拉伯语是什么原因？
答案 0 :(得分：0)
我认为这是数据类型错误。 fDate是整数，我认为ContentValues需要键和值String。
initialValues.put(KEY_FOUNDATION_DATE, ""+fDate);
答案 1 :(得分：0)
在没有实际测试代码的情况下，它看起来像你只是有一个小错误导致错误。您使用列名schools（定义为KEY_SCHOOLNAME）创建了schoolName表，但在insertSchool方法中，您似乎拥有initialValues.put(KEY_NAME, name);，其使用的是name users表中的列名insertSchool。我想如果您只是将initialValues.put(KEY_SCHOOLNAME, name);中的那一行更改为private void setUpCameraOutputs(int width, int height){
Activity activity = getActivity();
CameraManager manager = (CameraManager) activity.getSystemService(Context.CAMERA_SERVICE);
try {
for (String cameraId : manager.getCameraIdList()) {
CameraCharacteristics characteristics
= manager.getCameraCharacteristics(cameraId);
//Check if autofocus is available on camera
int[] afAvailableModes = characteristics.get(CameraCharacteristics.CONTROL_AF_AVAILABLE_MODES);
if (afAvailableModes.length == 0 || (afAvailableModes.length == 1
&& afAvailableModes[0] == CameraMetadata.CONTROL_AF_MODE_OFF)) {
mAutoFocusSupported = false;
} else {
mAutoFocusSupported = true;
}
//end autofocus check
//additional camera setup code here that is not relevant to this problem
}
private void takePicture() {
if (mAutoFocusSupported) {
lockFocus();
} else {
captureStillPicture();
}
}
private void lockFocus() {
try {
// This is how to tell the camera to lock focus.
mPreviewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,
CameraMetadata.CONTROL_AF_TRIGGER_START);
// Tell #mCaptureCallback to wait for the lock.
mState = STATE_WAITING_LOCK;
mCaptureSession.capture(mPreviewRequestBuilder.build(), mCaptureCallback,
mBackgroundHandler);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
private void captureStillPicture() {
try {
final Activity activity = getActivity();
if (null == activity || null == mCameraDevice) {
return;
}
// This is the CaptureRequest.Builder that we use to take a picture.
final CaptureRequest.Builder captureBuilder =
mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
captureBuilder.addTarget(mImageReader.getSurface());
// Use the same AE and AF modes as the preview.
captureBuilder.set(CaptureRequest.CONTROL_AF_MODE,
CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);
//setFlashMode(captureBuilder);
setFlashOn(captureBuilder);
// Orientation
int captureRotation = activity.getWindowManager().getDefaultDisplay().getRotation();
captureBuilder.set(CaptureRequest.JPEG_ORIENTATION, getOrientation(captureRotation));
CameraCaptureSession.CaptureCallback CaptureCallback
= new CameraCaptureSession.CaptureCallback() {
@Override
public void onCaptureCompleted(@NonNull CameraCaptureSession session,
@NonNull CaptureRequest request,
@NonNull TotalCaptureResult result) {
unlockFocus();
synchronized(lock) {
captureComplete(captureRotation);
}
}
};
mCaptureSession.stopRepeating();
mCaptureSession.abortCaptures();
mCaptureSession.capture(captureBuilder.build(), CaptureCallback, null);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
，那么它将解决您的错误。