这是我的主要性
DataBaseHelper myDb;
TextView roti, bread, biscuit, egg, dosa, fruits;
TextView groti, gbread, gbiscuit, gegg, gdosa, gfruite;
TextView used1, used2, used3, used4, used5, used6;
Spinner spinner, spinner2;
String[] listofitem = {"Roti", "Bread", "Biscuit", "Egg", "Dosa", "Fruits"
};
String[] value = {"Select", "1", "2"};
protected static TextView dispalycuerrentdate;
protected static TextView dispalycuerrenttime;
//for spinner string
String item, quantity;
Button submit;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//TEXVIEW INITIALIZER
submit = (Button) findViewById(R.id.submitbutton);
roti = (TextView) findViewById(R.id.roti);
bread = (TextView) findViewById(R.id.bread);
biscuit = (TextView) findViewById(R.id.biscuit);
egg = (TextView) findViewById(R.id.egg);
dosa = (TextView) findViewById(R.id.dosa);
fruits = (TextView) findViewById(R.id.fruits);
groti = (TextView) findViewById(R.id.groti);
gbread = (TextView) findViewById(R.id.qbread);
gbiscuit = (TextView) findViewById(R.id.gbiscuit);
gegg = (TextView) findViewById(R.id.qegg);
gdosa = (TextView) findViewById(R.id.qdosa);
gfruite = (TextView) findViewById(R.id.gfruits);
used1 = (TextView) findViewById(R.id.used1);
used2 = (TextView) findViewById(R.id.used2);
used3 = (TextView) findViewById(R.id.used3);
used4 = (TextView) findViewById(R.id.used4);
used5 = (TextView) findViewById(R.id.used5);
used6 = (TextView) findViewById(R.id.used6);
//Spinner Initializer
spinner = (Spinner) findViewById(R.id.Spinner1);
spinner2 = (Spinner) findViewById(R.id.Spinner2);
//Initializing db
myDb = new DataBaseHelper(this);
ArrayAdapter adapter = ArrayAdapter.createFromResource(this, R.array.mtype, android.R.layout.simple_selectable_list_item);
spinner.setAdapter(adapter);
ArrayAdapter adapterr = ArrayAdapter.createFromResource(this, R.array.mmtype, android.R.layout.simple_selectable_list_item);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
item = parent.getSelectedItem().toString();
Log.e("String", item);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
spinner2.setAdapter(adapterr);
spinner2.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
quantity = parent.getSelectedItem().toString();
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
//Date and time Picker
dispalycuerrentdate = (TextView) findViewById(R.id.date);
Button displayTimeButton = (Button) findViewById(R.id.select_time);
assert displayTimeButton != null;
displayTimeButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
DatePickerFragment datePickerFragment = new DatePickerFragment();
datePickerFragment.show(getFragmentManager(), "Select");
}
});
//for time
dispalycuerrenttime = (TextView) findViewById(R.id.timeee);
Button displayTimeButtonn = (Button) findViewById(R.id.select_timee);
assert displayTimeButtonn != null;
displayTimeButtonn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
TimePicker mTimePicker = new TimePicker();
mTimePicker.show(getFragmentManager(), "Select time");
}
});
//Button click
submit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
insertintodb();
// Updateintodb();
Toast.makeText(MainActivity.this, "ITEm:-" + item + "Quantity:-" + quantity, Toast.LENGTH_SHORT).show();
}
});
}
public static class DatePickerFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener {
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
final Calendar c = Calendar.getInstance();
int year = c.get(Calendar.YEAR);
int month = c.get(Calendar.MONTH);
int day = c.get(Calendar.DAY_OF_MONTH);
return new DatePickerDialog(getActivity(), this, year, month, day);
}
public void onDateSet(DatePicker view, int year, int month, int day) {
dispalycuerrentdate.setText("" + String.valueOf(year) + "/" + String.valueOf(month) + "/" + String.valueOf(day));
}
}
public static class TimePicker extends DialogFragment implements TimePickerDialog.OnTimeSetListener {
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
final Calendar c = Calendar.getInstance();
int hour = c.get(Calendar.HOUR_OF_DAY);
int minute = c.get(Calendar.MINUTE);
return new TimePickerDialog(getActivity(), this, hour, minute, DateFormat.is24HourFormat(getActivity()));
}
@Override
public void onTimeSet(android.widget.TimePicker view, int hourOfDay, int minute) {
dispalycuerrenttime.setText(" " + String.valueOf(hourOfDay) + " : " + String.valueOf(minute));
}
}
public void insertintodb() {
ContentValues insertvalue = new ContentValues();
Log.e("INSERTVALUE", insertvalue.toString());
insertvalue.put(myDb.ITEM, item.toString());
insertvalue.put(myDb.MAX, 2);
insertvalue.put(myDb.USED, quantity.toString());
insertvalue.put(myDb.DATE, String.valueOf(dispalycuerrentdate));
insertvalue.put(myDb.TIME, String.valueOf(dispalycuerrenttime));
myDb.db.insert(myDb.TABLE_NAME, null, insertvalue);
}
// public int Updateintodb(String oldvalue, String newUsed) {
////UPDATE "main"."fOOD_dIARY" SET "Used" = ?1 WHERE "ID" = 2
// ContentValues contentValues = new ContentValues();
// contentValues.put(myDb.USED, newUsed);
// String[] where = {oldvalue};
// int count = myDb.db.update(myDb.TABLE_NAME, contentValues, myDb.USED + " =? ", where);
// Log.e("COUNT",String.valueOf(count));
// return count;
//
// }
Here is my another class
public class DataBaseHelper extends SQLiteOpenHelper {
public static final String DATABSE_NAME = "foodDiary.db";
public static final String TABLE_NAME = "fOOD_dIARY";
public static final String Details = "Details";
public static final String VALUE = "Value";
public static final String ID = "ID";
public static final String ITEM = "Item";
public static final String MAX = "Max";
public static final String USED = "Used";
public static final String DATE = "Date";
public static final String TIME = "Time";
public static final String Quantity = "Time";
SQLiteDatabase db = this.getWritableDatabase();
private static final String CREATE_TABLE_TODO_TAG = "CREATE TABLE "
+ TABLE_NAME + "(" + ID + " INTEGER PRIMARY KEY,"
+ ITEM + " TEXT," + MAX + " INTEGER,"
+ DATE + " TEXT," + TIME + " TEXT,"
+ USED + " INTEGER" + ")";
private static final String CREATE_TABLE = "CREATE TABLE "
+ Details + "(" + ID + " INTEGER PRIMARY KEY,"
+ DATE + " TEXT," + TIME + " TEXT,"
+ USED + " INTEGER" + ")";
public DataBaseHelper(Context context) {
super(context, DATABSE_NAME, null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_TABLE_TODO_TAG);
db.execSQL(CREATE_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS" + TABLE_NAME);
db.execSQL("DROP TABLE IF EXISTS" + CREATE_TABLE);
onCreate(db);
}
}
我无法在数据库中更新我的插入查询，只要我点击提交按钮，它就会被添加到表中，而不是在数据库中更新， 我怎么能写一个更新查询，以便我可以用来更新数据库 请提供正确的指导，因为我在谷歌有搜索地段，但无法理解 我有一个微调器，我必须选择Item并在数据库中发送值并希望更新这些值
答案 0 :(得分：0)
试试这个
public int UpdateIntodb(String oldValue, String newUsed) {
ContentValues cv = new ContentValues();
cv.put(myDb.USED, newUsed);
return myDb.db.update(myDb.TABLE_NAME, cv, myDb.USED + "=" + oldValue, null);
}
答案 1 :(得分：0)
public void updateBanner(BannerMaster bannerMaster) {
database = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(TableBannerMaster.C01_BANNER_ID, bannerMaster.getBannerId());
values.put(TableBannerMaster.C02_BANNER_NAME, bannerMaster.getBannerName());
values.put(TableBannerMaster.C03_DISPLAY_ORDER, bannerMaster.getDisplayOrder());
values.put(TableBannerMaster.C04_BANNER_URL, bannerMaster.getBannerUrl());
values.put(TableBannerMaster.C05_APPLICABLE_IN, bannerMaster.getApplicableIn());
values.put(TableBannerMaster.C06_BANNER_IMAGE, bannerMaster.getBannerImage());
values.put(TableBannerMaster.C07_SHORT_DESC, bannerMaster.getShortDescription());
values.put(TableBannerMaster.C09_BANNER_ADDED_ON, DateUtils.DateToString(bannerMaster.getAddedOn(), f));
values.put(TableBannerMaster.C10_BANNER_UPDATE_ON, DateUtils.DateToString(bannerMaster.getUpdatedOn(), f));
// Inserting Row
database.update(TableBannerMaster.TABLE_BANNER_MASTER, values, TableBannerMaster.C01_BANNER_ID + " = ?", new String[]{String.valueOf(bannerMaster.getBannerId())});
database.close(); // Closing database connection
}
示例更新查询