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我正在使用eclipse ADT來創建和android ap，並且我正在嘗試創建一個sql數據庫。然而我不斷收到一個「E/SQLiteLog（786）：（1）沒有這樣的列：位置」錯誤，儘管我已經將它包含在數據庫創建類，任何想法？數據庫創建類Android數據庫沒有這樣的列錯誤？
代碼：
package com.example.networkassignment;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class DB
{
public static final String KEY_LOCATION = "location";
public static final String KEY_DATE = "date";
public static final String KEY_SUPPORT = "support";
public static final String KEY_ROWID = "_id";
private static final String TAG = "DB";
private DatabaseHelper mDbHelper;
private SQLiteDatabase mDb;
/**
* Database creation sql statement
*/
private static final String DATABASE_CREATE =
"create table shows (_id integer primary key autoincrement, "
+ "location text not null, date text not null, support text not null);";
private static final String DATABASE_NAME = "data";
private static final String DATABASE_TABLE = "shows";
private static final int DATABASE_VERSION = 2;
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 shows");
onCreate(db);
}
}
public DB(Context ctx)
{
this.mCtx = ctx;
}
public DB open() throws SQLException
{
mDbHelper = new DatabaseHelper(mCtx);
mDb = mDbHelper.getWritableDatabase();
return this;
}
public void close()
{
mDbHelper.close();
}
public long createShow(String location, String date, String support)
{
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_LOCATION, location);
initialValues.put(KEY_DATE, date);
initialValues.put(KEY_SUPPORT, support);
return mDb.insert(DATABASE_TABLE, null, initialValues);
}
public boolean deleteShow(long rowId)
{
return mDb.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0;
}
public Cursor fetchAllShows()
{
return mDb.query(DATABASE_TABLE, new String[] {KEY_ROWID, KEY_LOCATION,
KEY_DATE, KEY_SUPPORT}, null, null, null, null, null);
}
public Cursor fetchNote(long rowId) throws SQLException {
Cursor mCursor =
mDb.query(true, DATABASE_TABLE, new String[] {KEY_ROWID,
KEY_LOCATION, KEY_DATE,KEY_SUPPORT }, KEY_ROWID + "=" + rowId, null,
null, null, null, null);
if (mCursor != null)
{
mCursor.moveToFirst();
}
return mCursor;
}
public boolean updateNote(long rowId, String Location, String Date, String Support)
{
ContentValues args = new ContentValues();
args.put(KEY_LOCATION, Location);
args.put(KEY_DATE, Date);
args.put(KEY_SUPPORT, Support);
return mDb.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null) > 0;
}
}
和使用它的
package com.example.networkassignment;
import android.app.ListActivity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.app.Activity;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class database extends ListActivity
{
private static final int ACTIVITY_CREATE=0;
private static final int ACTIVITY_EDIT=1;
private static final int INSERT_ID = Menu.FIRST;
private static final int DELETE_ID = Menu.FIRST + 1;
private DB mDbHelper;
private Cursor mNotesCursor;
@Override
protected void onCreate(Bundle savedInstanceState)
{
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.database);
mDbHelper = new DB(this);
mDbHelper.open();
fillData();
registerForContextMenu(getListView());
}
private void fillData()
{
mNotesCursor = mDbHelper.fetchAllShows();
startManagingCursor(mNotesCursor);
String[] from = new String[]{DB.KEY_LOCATION, DB.KEY_DATE, DB.KEY_SUPPORT};
// and an array of the fields we want to bind those fields to (in this case just text1)
int[] to = new int[]{R.id.txtLocation, R.id.txtDate, R.id.txtSupport};
// Now create a simple cursor adapter and set it to display
SimpleCursorAdapter shows =
new SimpleCursorAdapter(this, R.layout.show_row, mNotesCursor, from, to);
setListAdapter(shows);
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
super.onCreateOptionsMenu(menu);
menu.add(0, INSERT_ID, 0, R.string.menu_insert);
return true;
}
@Override
public boolean onMenuItemSelected(int featureId, MenuItem item)
{
switch(item.getItemId()) {
case INSERT_ID:
createNote();
return true;
}
return super.onMenuItemSelected(featureId, item);
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo)
{
super.onCreateContextMenu(menu, v, menuInfo);
menu.add(0, DELETE_ID, 0, R.string.menu_delete);
}
@Override
public boolean onContextItemSelected(MenuItem item)
{
switch(item.getItemId())
{
case DELETE_ID:
AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
mDbHelper.deleteShow(info.id);
fillData();
return true;
}
return super.onContextItemSelected(item);
}
private void createNote()
{
Intent i = new Intent(this,ShowEdit.class);
startActivityForResult(i, ACTIVITY_CREATE);
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id)
{
super.onListItemClick(l, v, position, id);
Cursor c = mNotesCursor;
c.moveToPosition(position);
Intent i = new Intent(this, ShowEdit.class);
i.putExtra(DB.KEY_ROWID, id);
i.putExtra(DB.KEY_LOCATION, c.getString(c.getColumnIndexOrThrow(DB.KEY_LOCATION)));
i.putExtra(DB.KEY_DATE, c.getString(c.getColumnIndexOrThrow(DB.KEY_DATE)));
i.putExtra(DB.KEY_SUPPORT, c.getString(c.getColumnIndexOrThrow(DB.KEY_SUPPORT)));
startActivityForResult(i, ACTIVITY_EDIT);
}
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
Bundle extras = intent.getExtras();
switch(requestCode) {
case ACTIVITY_CREATE:
String location = extras.getString(DB.KEY_LOCATION);
String date = extras.getString(DB.KEY_DATE);
String support = extras.getString(DB.KEY_SUPPORT);
mDbHelper.createShow(location, date, support);
fillData();
break;
case ACTIVITY_EDIT:
Long rowId = extras.getLong(DB.KEY_ROWID);
if (rowId != null) {
String editLocation = extras.getString(DB.KEY_LOCATION);
String editDate = extras.getString(DB.KEY_DATE);
String editSupport = extras.getString(DB.KEY_SUPPORT);
mDbHelper.updateNote(rowId, editLocation, editDate, editSupport);
}
fillData();
break;
}
}
}
編輯類：accidentlly豎起DB類的舊版本....
我改變它到上面但我仍然得到「沒有這樣的列」的錯誤 – user3523724