如何顯示SQLite數據庫表？

Question

在我的應用程序我使用數據庫顯示一些用戶信息，我創建數據庫通過使用SQLite數據庫瀏覽器，並將該數據庫放置在資產文件夾，這是編碼，我想顯示此表。

public class DataBaseHelper extends SQLiteOpenHelper{ 
private Context mycontext; 
private String DB_PATH = "/data/data/com.slate.game/databases/";  
private static String DB_NAME = "slider.db";//the extension may be .sqlite or .db 
public SQLiteDatabase myDataBase;  
public DataBaseHelper(Context context) throws IOException { 
    super(context,DB_NAME,null,1); 
    this.mycontext=context; 
    boolean dbexist = checkdatabase(); 
    if(dbexist) { 
     System.out.println("Database exists"); 
     opendatabase(); 
    } 
    else { 
     System.out.println("Database doesn't exist"); 
     createdatabase(); 
    } 
    } 
    public void createdatabase() throws IOException{ 
    boolean dbexist = checkdatabase(); 
    if(dbexist) { 
     System.out.println(" Database exists."); 
    } 
    else{ this.getReadableDatabase(); 
    try{ 
     copydatabase(); 
    } 
    catch(IOException e) { 
     throw new Error("Error copying database"); 
     } 
    } 
    } 
private boolean checkdatabase() {  
    boolean checkdb = false; 
    try { 
     String myPath = DB_PATH + DB_NAME; 
     File dbfile = new File(myPath); 
     checkdb = dbfile.exists(); 
    } 
    catch(SQLiteException e) { 
     System.out.println("Database doesn't exist"); 
    } 
    return checkdb; 
} 
private void copydatabase() throws IOException { 
    //Open your local db as the input stream 
    InputStream myinput = mycontext.getAssets().open(DB_NAME); 
    // Path to the just created empty db 
    String outfilename = DB_PATH + DB_NAME; 
    System.out.println("outfilename"+outfilename); 
    //Open the empty db as the output stream 
    OutputStream myoutput = new FileOutputStream("/data/data/com.slate.game/databases/slider.db"); 
    // transfer byte to inputfile to outputfile 
    byte[] buffer = new byte[1024]; 
    int length; 
    while ((length = myinput.read(buffer))>0) { 
     myoutput.write(buffer,0,length); 
    } 
    //Close the streams 
    myoutput.flush(); 
    myoutput.close(); 
    myinput.close(); 
} 
public void opendatabase() throws SQLException { 
    //Open the database 
    String mypath = DB_PATH + DB_NAME; 
    myDataBase = SQLiteDatabase.openDatabase(mypath, null, SQLiteDatabase.OPEN_READWRITE); 
} 
public synchronized void close() { 
    if(myDataBase != null){ 
     myDataBase.close(); 
    } 
    super.close(); 
} 
@Override 
public void onCreate(SQLiteDatabase arg0) {   
} 
@Override 
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {  
} 

請幫助我如何顯示此表（數據庫）..

Answer 1

最後我使用的SQLite我準備從我會得到行的，並顯示使用TableLayout與TextView的數據庫..

這是數據庫適配器類

得到的答案從本書

Beginning.Android.Application.Development. 

public class DBAdapter3x3 { 

public static final String KEY_ROWID = "_id"; 
public static final String KEY_NAME = "name"; 
public static final String KEY_MOVES = "moves"; 
public static final String KEY_TIME = "time"; 
private static final String TAG = "DBAdapter"; 
private static final String DATABASE_NAME = "SliderDB3x3.db"; 
private static final String DATABASE_TABLE = "topscore3x3"; 
private static final int DATABASE_VERSION = 1; 
private static final String DATABASE_CREATE = "create table topscore3x3 " + 
             "(_id integer primary key autoincrement, " 
             + "name text not null, moves integer not null," 
             + "time text not null);"; 

private final Context context; 
private DatabaseHelper DBHelper; 
private SQLiteDatabase db; 

public DBAdapter3x3(Context ctx) { 
    this.context = ctx; 
    DBHelper = new DatabaseHelper(context); 
} 

private static class DatabaseHelper extends SQLiteOpenHelper { 

    DatabaseHelper(Context context)  { 
     super(context, DATABASE_NAME, null, DATABASE_VERSION); 
    } 

    @Override 
    public void onCreate(SQLiteDatabase db) { 
     try { 
      db.execSQL(DATABASE_CREATE); 
     } catch (SQLException e) { 
      e.printStackTrace(); 
     } 
    } 

    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
     Log.w(TAG, "Upgrading database from version " + oldVersion + " to " 
       + newVersion + ", which will destroy all old data"); 
     db.execSQL("DROP TABLE IF EXISTS contacts"); 
     onCreate(db); 
    } 
} 

//---opens the database--- 
public DBAdapter3x3 open() throws SQLException  { 

    db = DBHelper.getWritableDatabase(); 
    return this; 
} 

//---closes the database--- 
public void close() { 
    DBHelper.close(); 
} 

//---insert a contact into the database--- 
public long insertContact(String name, int moves,String time) { 

    ContentValues initialValues = new ContentValues(); 
    initialValues.put(KEY_NAME, name); 
    initialValues.put(KEY_MOVES, moves); 
    initialValues.put(KEY_TIME, time); 
    return db.insert(DATABASE_TABLE, null, initialValues); 
} 

//---deletes a particular contact--- 
public boolean deleteContact(long rowId) { 

    return db.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0; 
} 

//---retrieves all the contacts--- 
public Cursor getAllContacts() { 

    return db.query(DATABASE_TABLE, new String[] {KEY_ROWID, KEY_NAME, 
      KEY_MOVES, KEY_TIME}, null, null, null, null, null); 
} 

//---retrieves a particular contact--- 
public Cursor getContact(long rowId) throws SQLException { 

    Cursor mCursor = db.query(true, DATABASE_TABLE, new String[] {KEY_ROWID, KEY_NAME, 
        KEY_MOVES, KEY_TIME}, KEY_ROWID + "=" + rowId, null,null, null, null, null); 
    if (mCursor != null) { 
     mCursor.moveToFirst(); 
    } 
    return mCursor; 
} 

//---updates a contact--- 
public boolean updateContact(long rowId, String name, int moves, String time) { 

    ContentValues args = new ContentValues(); 
    args.put(KEY_NAME, name); 
    args.put(KEY_MOVES, moves); 
    args.put(KEY_TIME, time);  
    return db.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null) > 0; 
} 
//public Cursor fetchAllNotes() { 


public Cursor SortAllRows() { 
    return db.query(DATABASE_TABLE, new String[] { KEY_ROWID, KEY_NAME, 
      KEY_MOVES,KEY_TIME}, null, null, null, null, KEY_MOVES + " ASC"); 
} 
} 

我使用的數據庫在這個活動

public class TopScore3x3 extends Activity { 

private DBAdapter3x3 db; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.db3x3);  

    db = new DBAdapter3x3(this);   
    getall();  
    delete(); 

private void delete() { 

    db.open();  
    Cursor c = db.SortAllRows(); 
    int i=1; 
    if (c.moveToFirst()) {   
     do {    
      if(i>10) { db.deleteContact(i); } 
      i++; 
     } while (c.moveToNext()); 
    } 
    c.close(); 
    db.close(); 
} 

private void getall() { 
    //---get all contacts--- 
    db.open(); 
    //db.fetchAllNotes(); 
    Cursor c = db.SortAllRows(); 
    int i=1; 
    if (c.moveToFirst()) {   
     do { 
      DisplayContact(c,i++); 
     } while (c.moveToNext()); 
    } 
    c.close(); 
    db.close(); 
} 

public void DisplayContact(Cursor c,int row) {    

    String name11 = c.getString(1) + c.getString(2) + c.getString(3);   
    tv1.setText(name11); 

    } 
} 

Answer 2

使用下面的函數從數據庫中檢索數據

/** 
* This function used to select the records from DB. 
* @param tableName 
* @param tableColumns 
* @param whereClase 
* @param whereArgs 
* @param groupBy 
* @param having 
* @param orderBy 
* @return A Cursor object, which is positioned before the first entry. 
*/ 
public Cursor selectRecordsFromDB(String tableName, String[] tableColumns,String whereClase, String whereArgs[], String groupBy,String having, String orderBy) 
{ 
    return myDataBase.query(tableName, tableColumns, whereClase, whereArgs,groupBy, having, orderBy); 
} 

/** 
* select records from db and return in list 
* @param tableName 
* @param tableColumns 
* @param whereClase 
* @param whereArgs 
* @param groupBy 
* @param having 
* @param orderBy 
* @return ArrayList<ArrayList<String>> 
*/ 
public ArrayList<ArrayList<String>> selectRecordsFromDBList(String tableName, String[] tableColumns,String whereClase, String whereArgs[], String groupBy,String having, String orderBy) 
{  

    ArrayList<ArrayList<String>> retList = new ArrayList<ArrayList<String>>(); 
     ArrayList<String> list = new ArrayList<String>(); 
     Cursor cursor = myDataBase.query(tableName, tableColumns, whereClase, whereArgs, 
       groupBy, having, orderBy);   
     if (cursor.moveToFirst()) 
     { 
     do 
      { 
      list = new ArrayList<String>(); 
      for(int i=0; i<cursor.getColumnCount(); i++) 
      {     
       list.add(cursor.getString(i)); 
      } 
      retList.add(list); 
     } while (cursor.moveToNext()); 
     } 
     if (cursor != null && !cursor.isClosed()) { 
     cursor.close(); 
     } 
     return retList; 

} 

Answer 3

檢查：http://www.higherpass.com/Android/Tutorials/Accessing-Data-With-Android-Cursors/2/

使用Cursor c = db.rawQuery(sql, null)到得到結果，迭代在那裏解釋。