0
因此，我正在按照本教程：http://www.androidhive.info/2011/11/android-sqlite-database-tutorial/，仍然似乎沒有產生任何結果。有人可以幫助我，因爲我不知道爲什麼它不起作用。謝謝！它只是給我在logcat中的錯誤！Android SQLite數據庫簡單幫助
另外我怎麼會發布這個數據到textView或ListView在另一個活動？
public class DatabaseHandler extends SQLiteOpenHelper{
// Database version
private static final int DATABASE_VERSION = 1;
// Database name
private static final String DATABASE_NAME = "athleteProgram";
// Athletes table name
private static final String TABLE_ATHLETES= "athletes";
// Athletes table columns names
private static final String KEY_ID = "id";
private static final String KEY_NAME = "name";
private static final String KEY_AGE = "age";
DatabaseHandler(Context context)
{
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
// Creating table
@Override
public void onCreate(SQLiteDatabase db)
{
String CREATE_ATHLETES_TABLE = "CREATE TABLE " + TABLE_ATHLETES + "(" + KEY_ID +
" INTEGER PRIMARY KEY," + KEY_NAME + "TEXT," + KEY_AGE + " TEXT" + ")";
db.execSQL(CREATE_ATHLETES_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_ATHLETES);
// Create tables again
onCreate(db);
}
// All CRUD(Create, Read, Update, Delete) Operations
// Adding athlete
void addAthlete(Athlete athlete)
{
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, athlete.getName());
values.put(KEY_AGE, athlete.getAge());
// Inserting Row
db.insert(TABLE_ATHLETES, null, values);
db.close(); // Closing database connection
}
// Getting single Athlete
public Athlete getAthlete(int id)
{
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(TABLE_ATHLETES, new String[] {KEY_ID, KEY_NAME, KEY_AGE}, KEY_ID + "=?",
new String[] {String.valueOf(id)}, null, null, null, null);
if(cursor != null)
{
cursor.moveToFirst();
}
Athlete athlete = new Athlete(Integer.parseInt(cursor.getString(0)),
cursor.getString(1), cursor.getString(2));
return athlete;
}
// Getting All Athletes
public List<Athlete> getAllAthletes() {
List<Athlete> athleteList = new ArrayList<Athlete>();
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_ATHLETES;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Athlete athlete = new Athlete();
athlete.setID(Integer.parseInt(cursor.getString(0)));
athlete.setName(cursor.getString(1));
athlete.setAge(cursor.getString(2));
// Adding contact to list
athleteList.add(athlete);
} while (cursor.moveToNext());
}
// return athlete list
return athleteList;
}
// Updating single athlete
public int updateAthlete(Athlete athlete) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, athlete.getName());
values.put(KEY_AGE, athlete.getAge());
// updating row
return db.update(TABLE_ATHLETES, values, KEY_ID + " = ?",
new String[] { String.valueOf(athlete.getID()) });
}
// Deleting single athlete
public void deleteAthlete(Athlete athlete) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_ATHLETES, KEY_ID + " = ?",
new String[] { String.valueOf(athlete.getID()) });
db.close();
}
// Getting athletes Count
public int getAthletesCount() {
String countQuery = "SELECT * FROM " + TABLE_ATHLETES;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(countQuery, null);
cursor.close();
// return count
return cursor.getCount();
}
}
public class Athlete {
//private variables
int _id;
String _name;
String _age;
// Empty constructor
public Athlete(){
}
// constructor
public Athlete(int id, String name, String age){
this._id = id;
this._name = name;
this._age = age;
}
// constructor
public Athlete(String name, String age){
this._name = name;
this._age = age;
}
// getting ID
public int getID(){
return this._id;
}
// setting id
public void setID(int id){
this._id = id;
}
// getting name
public String getName(){
return this._name;
}
// setting name
public void setName(String name){
this._name = name;
}
// getting age
public String getAge(){
return this._age;
}
// setting age
public void setAge(String age){
this._age = age;
}
}
public class StartingActivity extends ListActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_starting);
}
// Will be called via the onClick attribute
// of the buttons in main.xml
public void onClick(View view) {
@SuppressWarnings("unchecked")
EditText editName = (EditText) findViewById(R.id.editName);
EditText editAge = (EditText) findViewById(R.id.editAge);
EditText editDate = (EditText) findViewById(R.id.editDate);
EditText editTier = (EditText) findViewById(R.id.editTier);
DatabaseHandler db = new DatabaseHandler(this);
/**
* CRUD Operations
* */
// Inserting Contacts
Log.d("Insert: ", "Inserting ..");
db.addAthlete(new Athlete("Joe", "20"));
db.addAthlete(new Athlete(editName.getText().toString(), editAge.getText().toString()));
// Reading all contacts
Log.d("Reading: ", "Reading all contacts..");
List<Athlete> athletes = db.getAllAthletes();
for (Athlete ath : athletes) {
String log = "Id: " + ath.getID() + " ,Name: " + ath.getName() + " ,Phone: " + ath.getAge();
// Writing Contacts to log
Log.d("Name: ", log);
}
}
}
可以顯示錯誤日誌。我想我有這個問題，但我需要錯誤日誌來確認它。 –
發佈時間太長。我可以在下午通過它雖然 – user3786864
這裏發佈只複製n粘貼.... –