我正在編寫我的第一個應用程序,並且我也試圖合併一個數據庫,並且我非常努力。我試圖做的是有多個spinners,那些spinners從數據庫中獲取他們的數據。每個微調器都會執行不同的查詢。SQlite查詢問題,導致強制關閉
到目前爲止,這是我:DBUtility
import android.content.Context;
進口android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; import android.database.sqlite.SQLiteDatabase.CursorFactory; import android.widget.SimpleCursorAdapter;
公共類DbUtility {
static final String DB_NAME="food";
static final String BEEF_TABLE="beef";
static final String CHICKEN_TABLE="chicken";
SQLiteDatabase db=null;
Context context;
public static class DatabaseHelper extends SQLiteOpenHelper
{
public DatabaseHelper(Context context, String name, CursorFactory factory, int version)
{
super(context, name, factory, version);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db)
{
db.execSQL("CREATE TABLE IF NOT EXISTS "+BEEF_TABLE+" (_id INT PRIMARY KEY, cookTime INT PRIMARY KEY ,name VARCHAR);");
db.execSQL("INSERT INTO "+BEEF_TABLE+" values(5000,'Skirt Steak');");
db.execSQL("INSERT INTO "+BEEF_TABLE+" values(10000,'Flank Steak');");
db.execSQL("INSERT INTO "+BEEF_TABLE+" values(15000,'Filet Mignon');");
db.execSQL("CREATE TABLE IF NOT EXISTS "+CHICKEN_TABLE+" (_id INT PRIMARY KEY, cookTime INT PRIMARY KEY ,name VARCHAR);");
db.execSQL("INSERT INTO "+CHICKEN_TABLE+" values(5000,'Breast');");
db.execSQL("INSERT INTO "+CHICKEN_TABLE+" values(10000,'Wings');");
db.execSQL("INSERT INTO "+CHICKEN_TABLE+" values(15000,'Burger');");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
public DbUtility(Context context) {
this.context=context;
}
public SimpleCursorAdapter getBeefAdapter()
{
DatabaseHelper dbhelper=new DatabaseHelper(this.context, DB_NAME, null, 1);
db=dbhelper.getWritableDatabase();
Cursor beefCursor=db.rawQuery("SELECT * FROM "+BEEF_TABLE, null);
while(!beefCursor.isLast())
beefCursor.moveToNext(); //I don't understand why but it's necessary (alternative call c.getCount())
String[] from=new String[1];
from[0]="name";
int[] to=new int[1];
to[0]=android.R.id.text1;
SimpleCursorAdapter beefAdapter=new SimpleCursorAdapter(this.context, android.R.layout.simple_spinner_item, beefCursor, from, to);
beefAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
db.close();
return beefAdapter;
}
public SimpleCursorAdapter getChickenAdapter()
{
DatabaseHelper dbhelper=new DatabaseHelper(this.context, DB_NAME, null, 1);
db=dbhelper.getWritableDatabase();
Cursor chickenCursor=db.rawQuery("SELECT * FROM "+CHICKEN_TABLE, null);//If I change this to BEEF_TABLE it doesn't force close...
while(!chickenCursor.isLast())
chickenCursor.moveToNext(); //I don't understand why but it's necessary (alternative call c.getCount())
String[] from=new String[1];
from[0]="name";
int[] to=new int[1];
to[0]=android.R.id.text1;
SimpleCursorAdapter chickenAdapter=new SimpleCursorAdapter(this.context, android.R.layout.simple_spinner_item, chickenCursor, from, to);
chickenAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
db.close();
return chickenAdapter;
}
}
,我也有我的chickenActivity,這是我的微調器:
包com.tsilo.grillbuddy;
import android.app.Activity; import android.os.Bundle; import android.widget.SimpleCursorAdapter; import android.widget.Spinner;
公共類ChickenActivity extends Activity活動第一次創建時調用。 */ @Override public void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.spinner);
DbUtility db=new DbUtility(this);
SimpleCursorAdapter beefAdapter=db.getBeefAdapter();
Spinner beefSpinner=(Spinner)this.findViewById(R.id.spinner);
beefSpinner.setAdapter(beefAdapter);
SimpleCursorAdapter chickenAdapter=db.getChickenAdapter();
Spinner chickenSpinner=(Spinner)this.findViewById(R.id.spinner2);
chickenSpinner.setAdapter(chickenAdapter);
}
}
這是我已經注意到:
如果我改變我的getChickenAdapter(),所以它查詢BEEF_TABLE,它的工作原理,只有當我切換到CHICKEN_TABLE,它強制關閉。
我DDMS錯誤:
12-06 16:03:12.473:INFO /數據庫(11856):源碼返回:錯誤代碼= 1,味精=沒有這樣的表:雞 12-06 16:03:12.473:DEBUG/AndroidRuntime(11856):關閉虛擬機 12-06 16:03:12.473:WARN/dalvikvm(11856):threadid = 1:線程以未捕獲的異常退出(group = 0x4001d7f0) 12- 06 16:03:12.483:錯誤/ AndroidRuntime(11856):致命例外:主 12-06 16:03:12.483:錯誤/ AndroidRuntime(11856):java.lang.RuntimeException:無法啓動活動ComponentInfo {com.tsilo .grillbuddy/com.tsilo.grillbuddy.ChickenAct ivity}:android.database.sqlite.SQLiteException:沒有這樣的表:雞:,編譯時:SELECT * FROM chicken
您在DDMS中遇到的錯誤是什麼? – kthorat 2010-12-06 20:39:22
爲什麼BEEF_TABLE有兩個`PRIMARY KEY`? – Pentium10 2010-12-06 20:41:28