更新表android sqlite时出错

Question

`// * ** * ** * ** * ** * ** Error showing in Logcat ** * *** android.database.sqlite.SQLiteException: no such column: me: , while compiling: UPDATE TemplateTable SET user=?, alert=?, mycard=? WHERE user=me

// * ** * ** * ** * ** * ** * * Settings Activity * ** * ** * ** * ** *

Button save=(Button) findViewById(R.id.save_templates); save.setOnClickListener(new View.OnClickListener() {

        public void onClick(View arg0) {
            // TODO Auto-generated method stub

            // Save templates selected 
            CardsDatabase db = new CardsDatabase(Settings.this);
            db.open();
            ContentValues cv=new ContentValues();
            cv.put(CardsDatabase.USERTEMPLATE, "me");
            cv.put(CardsDatabase.ALERT, Integer.toString(alert));
            cv.put(CardsDatabase.MYCARD, Integer.toString(mycard));
            db.updateTemplate(cv);
            db.close();

            Toast.makeText(Settings.this, "Settings saved successfully.", Toast.LENGTH_SHORT).show();

        }
    }); 

// * ** * ** * ** * ** * ** * ** Database class * ** * ** * ** * ** * ***

public class CardsDatabase {

public static String USERTEMPLATE = "user";
public static String MYCARD = "mycard";
public static String ALERT = "alert";

public static String USER = "user";
public static String NAME = "name";
public static String COMPANY = "company";
public static String TITLE = "title";
public static String ADDRESS = "address";
public static String PHONE = "phone";
public static String CEL = "cel";
public static String EMAIL = "email";
public static String PHOTO = "photo";

public static String MAC = "macaddress";

private static String DATABASE_NAME = "CardsDatabase";
public static String DATABASE_TABLE_TEMPLATE = "TemplateTable";
public static String DATABASE_TABLE_MYTABLE = "MYTable";
public static String DATABASE_TABLE_CONTACTS = "ContactsTable";

private static int DATABASE_VERSION = 1;

private DbHelper ourHelper;
private final Context ourContext;
private SQLiteDatabase ourDatabase;

private static class DbHelper extends SQLiteOpenHelper {

    public DbHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
        // TODO Auto-generated constructor stub
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub
        // Log.d(Tag,"Inner on create called");
        db.execSQL("CREATE TABLE " + DATABASE_TABLE_TEMPLATE + " ("
                + USERTEMPLATE + " TEXT NOT NULL," + MYCARD
                + " TEXT NOT NULL," + ALERT + " TEXT NOT NULL" + ");");

        db.execSQL("CREATE TABLE " + DATABASE_TABLE_MYTABLE + " (" + USER
                + " TEXT NOT NULL," + NAME + " TEXT NOT NULL," + COMPANY
                + " TEXT," + TITLE + " TEXT," + ADDRESS + " TEXT," + PHONE
                + " TEXT NOT NULL," + CEL + " TEXT," + EMAIL
                + " TEXT NOT NULL," + PHOTO + " BLOB" + ");");

        db.execSQL("CREATE TABLE " + DATABASE_TABLE_CONTACTS + " (" + MAC
                + " TEXT NOT NULL" + ");");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub
        db.execSQL("DROP TABLE IF EXISTS" + DATABASE_TABLE_TEMPLATE);
        db.execSQL("DROP TABLE IF EXISTS" + DATABASE_TABLE_MYTABLE);
        db.execSQL("DROP TABLE IF EXISTS" + DATABASE_TABLE_CONTACTS);
        onCreate(db);
    }

}

public CardsDatabase(Context c) {
    ourContext = c;
}

public CardsDatabase open() throws SQLException {
    ourHelper = new DbHelper(ourContext);
    ourDatabase = ourHelper.getWritableDatabase();
    return this;
}

public void close() {
    ourHelper.close();
}

public void createEntry(int type, ContentValues cv) {
    // TODO Auto-generated method stub

    switch (type) {
    case 1:
        ourDatabase.insert(DATABASE_TABLE_TEMPLATE, null, cv);
        break;
    case 2:
        ourDatabase.insert(DATABASE_TABLE_MYTABLE, null, cv);
        break;
    case 3:
        ourDatabase.insert(DATABASE_TABLE_CONTACTS, null, cv);
        break;
    }

}

public Cursor getTemplate() throws SQLException {
    // TODO Auto-generated method stub

    String[] columns = new String[] { USERTEMPLATE, MYCARD, ALERT };

    Cursor c = ourDatabase.query(DATABASE_TABLE_TEMPLATE, columns, null,
            null, null, null, null);

    return c;
}

public Cursor getMyData() throws SQLException {
    // TODO Auto-generated method stub

    String[] columns = new String[] { USER, NAME, COMPANY, TITLE, ADDRESS,
            PHONE, CEL, EMAIL, PHOTO };

    Cursor c = ourDatabase.query(DATABASE_TABLE_MYTABLE, columns, null,
            null, null, null, null);

    return c;
}

public boolean contactExist(String mac) throws SQLException {
    // TODO Auto-generated method stub

    String[] columns = new String[] { MAC };

    Cursor c = ourDatabase.query(DATABASE_TABLE_CONTACTS, columns, MAC
            + "=" + mac, null, null, null, null);

    return c.getCount() > 0 ? true : false;
}

public void updateTemplate(ContentValues cv) {
    String m = "me";
    ourDatabase.update(DATABASE_TABLE_TEMPLATE, cv, USERTEMPLATE + "=" + m,
            null);
}

public void updateMytable(ContentValues cv) {
    String m = "me";
    ourDatabase.update(DATABASE_TABLE_MYTABLE, cv, USER + "=" + m, null);
}

}`

Answer 1

You need to provide more details, but I'd be willing to bet you updated your schema without incrementing your version number in your SQLiteOpenHelper implementation.

EDIT

After looking through your code, you need to add single quotes to your WHERE clause in the update method. If you don't use quotes, the db engine treats it as a column in your table, hence the error "no such column: me"

You have:

public void updateTemplate(ContentValues cv) {
    String m = "me";
    ourDatabase.update(DATABASE_TABLE_TEMPLATE, cv, USERTEMPLATE + "=" + m,
            null);
}

should be something like:

public void updateTemplate(ContentValues cv) {
    String m = "me";
    String WHERE = String.format("%s='%s'", USERTEMPLATE, m);
    ourDatabase.update(DATABASE_TABLE_TEMPLATE, cv, WHERE, null);
}

Answer 2

您的查询中需要在“我”周围加上单引号