Question

我通过Android应用程序访问数据库时出错。我正在

11-30 21：31：17.452：E / SQLiteLog（17817）:( 1）没有这样的表：draw

11-30 21：31：17.452：E / DataAdapter（17817）：getTestData＆gt;＆gt; android.database.sqlite.SQLiteException：没有这样的表：draw（代码1）:,编译时：SELECT drawnumb，b1 ，b2，b3，b4，b5，b6 FROM绘制WHERE drawnumb = 1221

不确定问题是什么。如果有人可以为我解决问题。这里是我认为很有用的代码块。如果有人要求提供更多代码，请告诉我。

感谢任何帮助。

这是databaseHandler

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.Cursor;

public class databaseHandler extends SQLiteOpenHelper {

private static final int DATABASE_VERSION = 1;

private static final String DATABASE_NAME = "drawManager",
    TABLE_DRAWS = "draws",
    KEY_DRAWNUMB = "drawnumb",
    KEY_B1 = "b1",
    KEY_B2 = "b2",
    KEY_B3 = "b3",
    KEY_B4 = "b4",
    KEY_B5 = "b5",
    KEY_B6 = "b6",
    KEY_B7 = "b7",
    KEY_WINNERS = "winners";

public databaseHandler (Context context){
    super (context, DATABASE_NAME, null, DATABASE_VERSION);

}
@Override
public void onCreate(SQLiteDatabase db) {
    db.execSQL("CREATE TABLE IF NOT EXISTS" + TABLE_DRAWS + "(" + KEY_DRAWNUMB + " INTEGER PRIMARY KEY,"+ KEY_B1 + " INTEGER," + KEY_B2 + " INTEGER,"+
            KEY_B3 + " INTEGER," + KEY_B4 + " INTEGER,"+KEY_B5 + " INTEGER," + KEY_B6 + " INTEGER,"+KEY_B7 + " INTEGER," + KEY_WINNERS + " INTEGER)");
    // TODO Auto-generated method stub

}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    // TODO Auto-generated method stub

}

public Draw getDraw(int drawnum){
    SQLiteDatabase db = getReadableDatabase();


    Cursor cursor = db.query(TABLE_DRAWS,  new String[] {KEY_DRAWNUMB, KEY_B1, KEY_B2, KEY_B3, KEY_B4,
            KEY_B5, KEY_B6, KEY_B7, KEY_WINNERS}, KEY_DRAWNUMB + "=?", new String []{String.valueOf(drawnum)} , null, null, null, null);
if (cursor != null)
    cursor.moveToFirst();

Draw draw = new Draw(Integer.parseInt(cursor.getString(0)),Integer.parseInt(cursor.getString(1)),Integer.parseInt(cursor.getString(2)),
        Integer.parseInt(cursor.getString(3)),Integer.parseInt(cursor.getString(4)),Integer.parseInt(cursor.getString(5)),
        Integer.parseInt(cursor.getString(6)),Integer.parseInt(cursor.getString(7)),Integer.parseInt(cursor.getString(8)));
db.close();
cursor.close();
return draw;
}
}

这是来自databaseHelper的片段，我在这里引用数据库test2.sqlite

public class DatabaseHelper extends SQLiteOpenHelper
{
private static String TAG = "DataBaseHelper"; // Tag just for the LogCat   window
//destination path (location) of our database on device
private static String DB_PATH = ""; 
private static String DB_NAME ="test2.sqlite";// Database name
private SQLiteDatabase mDataBase; 
private final Context mContext;

这是我使用数据库访问数据库中的绘图的地方，我确信它存在

//database test
    buttonone.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            DataAdapter mDbHelper = new DataAdapter(getApplicationContext());         
            mDbHelper.createDatabase();       
            mDbHelper.open(); 
             String results="";
            Cursor testdata = mDbHelper.getTestData(); 
            try {
                //for (int i=1;1<7;i++){
                    results = testdata.getString(1);//testdata.getColumnIndex("b"+ Integer.toString(i)));
                    results += " "+ testdata.getString(2);
                    results += " "+ testdata.getString(3);
                    results += " "+ testdata.getString(4);
                    results += " "+ testdata.getString(5);
                    results += " "+ testdata.getString(6);

            }
                //results = testdata.getString(testdata.getColumnIndex("drawnumb"));
            //}
        catch (Exception ex) {
                results = "not working";
            }

            //String name = Utility.GetColumnValue(testdata, "Name");
            //String email = Utility.GetColumnValue(testdata, "Email");

            //Utility.ShowMessageBox(this, "Name: "+ name + " and Email: "+ email);
            mDbHelper.close();
            //res = getRandomNumbers(numbers);
            lottery.setText("Your numbers: " + results);
        }
    });

这应该返回绘图号1221，如我在dataAdapter类

中找到的方法中所示

public Cursor getTestData()
 {
     try
     {
         String sql ="SELECT drawnumb, b1, b2, b3, b4, b5, b6 FROM draws WHERE drawnumb = 1221";

         Cursor mCur = mDb.rawQuery(sql, null);
         if (mCur!=null)
         {
            mCur.moveToNext();
         }
         return mCur;
     }
     catch (SQLException mSQLException) 
     {
         Log.e(TAG, "getTestData >>"+ mSQLException.toString());
         throw mSQLException;
     }
 }

Answer 1

这就是您的表格未创建的原因：

db.execSQL("CREATE TABLE IF NOT EXISTS" + TABLE_DRAWS + ...

您忘记在单词EXISTS后插入空格。
这是你没有空间的地方：CREATE TABLE IF NOT EXISTSdraws。

所以它有效：

db.execSQL("CREATE TABLE IF NOT EXISTS " + TABLE_DRAWS + ...

android sqlite数据库错误没有这样的表

1 个答案: