这是我在下面给出的查询.
select * from data where value = "yes";
我的id是自动增量,下面是给定查询的结果.
id || value
1 || yes
3 || yes
4 || yes
6 || yes
9 || yes
如何在sqlite中使用ROW_NUMBER？这样我就可以得到下面给出的结果.
NoId || value
1 || yes
2 || yes
3 || yes
4 || yes
5 || yes
ROW_NUMBER作为NoId.
我有一个spinner加载数据到sqlite
我在数据库中有字段ID和字段名称.
private void loadSpinnerDataHama() {
// database handler
DatabaseSpinner db = new DatabaseSpinner(getApplicationContext());
// Spinner Drop down elements
List<String> lables = db.getAllLabels();
// Creating adapter for spinner
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, lables);
// Drop down layout style - list view with radio button
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// attaching data adapter to spinner
spin2.setAdapter(dataAdapter);
}
public List<String> getAllLabels(){
List<String> labels = new ArrayList<String>();
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_LABELS;
SQLiteDatabase db = this.getReadableDatabase(); …我有2个旋转器.
这是我的活动
package com.example.belajarcombobox;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
public class CreateComboBox extends Activity implements AdapterView.OnItemSelectedListener {
TextView selection;
TextView selection2;
String[] countries = {"Amerika","Argentina","Brazil"};
String[] city = {"London","Paris","Buenos Aires"};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
selection = (TextView) findViewById(R.id.selection);
Spinner spin = (Spinner) findViewById(R.id.spinner);
ArrayAdapter<String> aa = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, countries);
aa.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spin.setAdapter(aa);
spin.setOnItemSelectedListener(this);
selection2 = (TextView) findViewById(R.id.selection2);
Spinner spin2 = (Spinner) findViewById(R.id.spinner2);
ArrayAdapter<String> bb = new …我使用.NET framework 4.
在我的表格中,我有41个文本框.
我尝试过这段代码:
private void ClearTextBoxes()
{
Action<Control.ControlCollection> func = null;
func = (controls) =>
{
foreach (Control control in controls)
if (control is TextBox)
(control as TextBox).Clear();
else
func(control.Controls);
};
func(Controls);
}
这段代码:
private void ClearTextBoxes(Control.ControlCollection cc)
{
foreach (Control ctrl in cc)
{
TextBox tb = ctrl as TextBox;
if (tb != null)
tb.Text = String.Empty;
else
ClearTextBoxes(ctrl.Controls);
}
}
这仍然不适合我.
当我尝试使用此代码TextBoxName.Text = String.Empty;清除时,文本框成功清除但只有一个文本框,仍然有40个文本框.
我该如何解决这个问题？
编辑
我投入了这个:
private void btnClear_Click(object sender, EventArgs e)
{ …任何人都可以帮助显示 NMEA 句子，如 $GPRMC ..... 我正在使用以下代码：
public class SampleNMEA extends Activity implements LocationListener, GpsStatus.Listener,GpsStatus.NmeaListener{
LocationManager lm;
TextView output;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
output = (TextView)findViewById(R.id.out);
lm = (LocationManager) getSystemService(LOCATION_SERVICE);
lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 60000,10,this);
final Location location=lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
output.append("\nBelow Data is about the your location:");
output.append("\n\n\nLatit:"+location.getLatitude());
output.append("\n\nLongitude:"+location.getLongitude());
output.append("\n\nTime: "+location.getTime());
}
public void onLocationChanged(Location location)
{
output.append("\n\n\nLatitude:"+location.getLatitude());
output.append("\n\nLongitude:"+location.getLongitude());
output.append("\n\nTime: "+location.getTime());
}
public void onProviderDisabled(String arg0) {
// TODO Auto-generated method stub
} …我有一种方法来插入数据并检查代码是否存在
如果存在则不创建插入,如果不存在则创建插入
但是当我尝试运行数据时无法插入数据库
这是我的插入代码
public void processAddA(DialogWrapper wrapper)
{
ContentValues values = new ContentValues(2);
values.put(DatabaseHelper.CODE, wrapper.getCode());
values.put(DatabaseHelper.ALAMAT, wrapper.getAlamat());
values.put(DatabaseHelper.BATAS, wrapper.getBatas());
values.put(DatabaseHelper.LAT, wrapper.getLat());
values.put(DatabaseHelper.LON, wrapper.getLon());
values.put(DatabaseHelper.LUAS, wrapper.getLuas());
values.put(DatabaseHelper.TANGGAL_AWAL, wrapper.getTglA());
values.put(DatabaseHelper.TANGGAL_AKHIR, wrapper.getTglB());
values.put(DatabaseHelper.USER_ID, wrapper.getUser());
values.put(DatabaseHelper.SENT, "0");
open();
//check if value exist or not.
Cursor c = database.rawQuery("SELECT * FROM petak_tetap where code='"
+ wrapper.getCode() + "'", null);
if(c == null)
{
//doesn't exists therefore insert record.
database.insert("petak_tetap", DatabaseHelper.ALAMAT,
values);
}
close();
}
怎么解决这个问题？
第一次发布,自我思考的程序员,并在android中有一个类强制转换异常.我明白错误是什么,我知道是什么导致了它,但我不知道它为什么会发生.
public class ChangeTwitter extends Activity
{
EditText newtwitter;
EditText password;
Button submitbutton;
InputStream is = null;
String result = "";
private static String passwordchecker;
FUNCTIONS callfunction = new FUNCTIONS();
ERRORS callerrors = new ERRORS();
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.twitterchanger);
try
{
newtwitter = (EditText) findViewById(R.id.twitterchangertwitter);
password = (EditText) findViewById(R.id.twitterchangerpassword);
submitbutton = (Button) findViewById(R.id.twitterchangersubmitbutton);
}
catch (Exception e)
{
Log.e("log_tag", "Error is:"+e.toString());
}
public class ChangeTwitter extends Activity
{
<TextView
android:text=""
android:id="@+id/twitterchangerspacer1"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</TextView>
<TextView
android:text="Please …
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