我已經創建了一個基於此Deleting entry from SQLite database教程的程序。刪除Android SQLite數據庫中的一行後發生行ID錯誤
除了一件事以外,一切正常。雖然我已經向SQLite數據庫添加了新行,但它一切正常,但是一旦我刪除了其中的一行,其餘的ROWID都沒有更新自己,只是繼續像往常一樣繼續計數。
例如,我添加了五行,而不是刪除了第三行,所以其他人應該將自己重寫爲1,2,3,4。但是ROWID仍然存在:1,2,4,5
我在網上尋找這個問題,我發現我應該把剩下的行放到一個新的數據庫中,然後回來,它應該是所有的對。但是我之前從未使用過SQL,所以我不知道代碼如何解決這個問題。 你能告訴我,如何解決我的問題?
這裏是我的數據庫代碼:
public class HotOrNot {
public static final String KEY_ROWID = "_id";
public static final String KEY_NAME = "persons_name";
public static final String KEY_HOTNESS = "persons_hotness";
private static final String DATABASE_NAME = "HotOrNotdb";
private static final String DATABASE_TABLE = "peopleTable";
private static final 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
db.execSQL("CREATE TABLE " + DATABASE_TABLE + " (" +
KEY_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
KEY_NAME + " TEXT NOT NULL, " +
KEY_HOTNESS + " 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);
onCreate(db);
}
}
public HotOrNot(Context c){
ourContext = c;
}
public HotOrNot open() throws SQLException{
ourHelper = new DbHelper(ourContext);
ourDatabase = ourHelper.getWritableDatabase();
return this;
}
public void close(){
ourHelper.close();
}
public long createEntry(String name, String hotness) {
// TODO Auto-generated method stub
ContentValues cv = new ContentValues();
cv.put(KEY_NAME, name);
cv.put(KEY_HOTNESS, hotness);
return ourDatabase.insert(DATABASE_TABLE, null, cv);
}
public String getData() {
// TODO Auto-generated method stub
String[] columns = new String[]{ KEY_ROWID, KEY_NAME, KEY_HOTNESS};
Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null, null, null);
String result = "";
int iRow = c.getColumnIndex(KEY_ROWID);
int iName = c.getColumnIndex(KEY_NAME);
int iHotness = c.getColumnIndex(KEY_HOTNESS);
for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()){
result = result + c.getString(iRow) + " " + c.getString(iName) + " " + c.getString(iHotness) + "\n";
}
return result;
}
public String getName(long l) throws SQLException{
// TODO Auto-generated method stub
String[] columns = new String[]{ KEY_ROWID, KEY_NAME, KEY_HOTNESS};
Cursor c = ourDatabase.query(DATABASE_TABLE, columns, KEY_ROWID + "=" + l, null, null, null, null);
if(c != null){
c.moveToFirst();
String name = c.getString(1);
return name;
}
return null;
}
public String getHotness(long l) throws SQLException{
// TODO Auto-generated method stub
String[] columns = new String[]{ KEY_ROWID, KEY_NAME, KEY_HOTNESS};
Cursor c = ourDatabase.query(DATABASE_TABLE, columns, KEY_ROWID + "=" + l, null, null, null, null);
if(c != null){
c.moveToFirst();
String hotness = c.getString(2);
return hotness;
}
return null;
}
public void updateEntry(long lRow, String mName, String mHotness) throws SQLException{
// TODO Auto-generated method stub
ContentValues cvUpdate = new ContentValues();
cvUpdate.put(KEY_NAME, mName);
cvUpdate.put(KEY_HOTNESS, mHotness);
ourDatabase.update(DATABASE_TABLE, cvUpdate, KEY_ROWID + "=" + lRow, null);
}
public void deleteEntry(long lRow1) throws SQLException{
// TODO Auto-generated method stub
ourDatabase.delete(DATABASE_TABLE, KEY_ROWID + "=" + lRow1, null);
}
}
提前感謝!
爲什麼你需要行是順序的? ID就是這樣一個ID。對於您的應用程序而言,它應該無關緊要,因爲它只有1或1,000,000,因爲它僅用作該行數據的唯一標識符。 –
因爲我寫了一個while循環遍歷所有行。我的「while」條件是,只要第二列等於=「」它必須停止。但現在它停在第3列,它不讀第4和第5列。 – adamhala007