データベースクエリを単一のクラスに入れる方法

Question

ここに私の問題があります。バインドとイテレータに影響を与えずに、SQLiteStatementを単一のクラスに使用する挿入クエリをどのように置くことができますか？これまで私が進めてきた進歩があります。データベースはMainActivityにありますが、すべてのクエリをクラス内に配置します。

 btnSave = (Button) findViewById(R.id.btnSaveAlbum); 
      btnSave.setOnClickListener(new View.OnClickListener() { 
       @TargetApi(Build.VERSION_CODES.JELLY_BEAN) 
       @Override 
       public void onClick(View v) { 
        txtTitle = (EditText) findViewById(R.id.txtAlbumTitle); 
        String title = txtTitle.getText().toString(); 

        if (requestCode == 200 && resultCode == Activity.RESULT_OK) { 
         String[] apath = data.getStringArrayExtra("all_path"); 
         ArrayList<String> strings = new ArrayList<String>(); 
         Iterator iterate = strings.iterator(); 
         for (String string : apath) { 
          strings.add(string); 
         } 


         String query = "INSERT INTO " + TBNAME + " VALUES (?,?);"; 
         SQLiteStatement statement = timedb.compileStatement(query); 
         timedb.beginTransaction(); 

         while (iterate.hasNext()) { 
          statement.clearBindings(); 
          statement.bindString(1, title); 
          statement.bindString(2, iterate.next().toString()); 
          statement.execute(); 
         } 

         timedb.setTransactionSuccessful(); 
         timedb.endTransaction(); 
         timedb.close(); 
Toast.makeText(MainActivity.this, "Successful", Toast.LENGTH_LONG).show(); 

        } 
       } 
      }); 

Answer 1

好きですdatabseヘルパークラスを作成します。このような何か：あなたは新しいmethod.Toはヘルパーコールのインスタンスを取得することができますすべてのクエリのために

import android.content.Context; 
import android.content.Intent; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteStatement; 
import android.widget.Toast; 

import java.util.ArrayList; 
import java.util.Iterator; 

public class DatabaseHelper { 

    private static DatabaseHelper instance; 
    private static final String TBNAME = "your first table name"; 
    private static final String OTHER_TB_NAME = "your other table name"; 

    private Context context; 
    private SQLiteDatabase timedb; 

    public static DatabaseHelper getInstance(Context context) { 
     if (instance == null) { 
      instance = new DatabaseHelper(context); 
     } 
     return instance; 
    } 

    private DatabaseHelper(Context context) { 
     this.context = context; 
     timedb = //your initialization 
    } 

    public void queryA(Intent data, String title) { 
     String[] apath = data.getStringArrayExtra("all_path"); 
     ArrayList<String> strings = new ArrayList<String>(); 
     Iterator iterate = strings.iterator(); 
     for (String string : apath) { 
      strings.add(string); 
     } 


     String query = "INSERT INTO " + TBNAME + " VALUES (?,?);"; 
     SQLiteStatement statement = timedb.compileStatement(query); 
     timedb.beginTransaction(); 

     while (iterate.hasNext()) { 
      statement.clearBindings(); 
      statement.bindString(1, title); 
      statement.bindString(2, iterate.next().toString()); 
      statement.execute(); 
     } 

     timedb.setTransactionSuccessful(); 
     timedb.endTransaction(); 
     timedb.close(); 
     Toast.makeText(context, "Successful", Toast.LENGTH_LONG).show(); 
    } 
} 

：あなたはすべてのクエリを入れてシングルトンクラスを構築することですDatabaseHelper.getInstance()

Answer 2

この

import java.text.ParseException; 
import java.util.ArrayList; 
import android.content.ContentValues; 
import android.content.Context; 
import android.database.Cursor; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteOpenHelper; 
import android.util.Log; 

public class DbHelper extends SQLiteOpenHelper 
{ 
    private final String TAG = "Database"; 

    public static final int DATABASE_VERSION = 13; 
    public static final String DATABASE_NAME = "assessment.db"; 



    public static final String FEED_AUDIO_TABLE = "audiTable"; 
    public static final String FEED_AUDIO_COLUMN_ID = "audioId"; 
    public static final String FEED_AUDIO_AUDIO = "audio"; 
    public static final String FEED_AUDIO_ISDOWNLODED = "audioIsdownloaded"; 


    Context context;  

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

     this.context = context; 
    } 

    @Override 
    public void onCreate(SQLiteDatabase db) 
    { 
    //table 
     db.execSQL("create table "+FEED_AUDIO_TABLE+ 
       "("+FEED_AUDIO_COLUMN_ID+" INTEGER PRIMARY KEY AUTOINCREMENT, "+FEED_AUDIO_AUDIO+" text NOT NULL UNIQUE, "+FEED_AUDIO_ISDOWNLODED+" text);"); 
    } 

    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) 
    { 

     db.execSQL("DROP TABLE IF EXISTS "+FEED_AUDIO_TABLE); 
     onCreate(db); 
    } 




    //insert method 
    public boolean insertAudioForDownload(String audioUrl, String isDownloaded) 
    { 
     SQLiteDatabase db = this.getWritableDatabase(); 
     ContentValues contentValues = new ContentValues(); 

     contentValues.put(FEED_AUDIO_AUDIO, audioUrl); 
     contentValues.put(FEED_AUDIO_ISDOWNLODED, isDownloaded); 

     long i = db.insertWithOnConflict(FEED_AUDIO_TABLE, null, contentValues, SQLiteDatabase.CONFLICT_REPLACE); 

     Log.i(TAG, "insertForBackground Value inserted: "+i +" for audioUrl :"+ audioUrl+ " isDownloaded is : "+ isDownloaded); 


     return true; 
    } 

    //Read method 

    public ArrayList<String> getAudioForDownload(String isDownloaded) 
    { 
     ArrayList<String> arrayList = new ArrayList<String>(); 
     String gridSelected = ""; 
     SQLiteDatabase db = getReadableDatabase(); 

     String where = FEED_AUDIO_ISDOWNLODED+"=?"; 
     String[] whereArgs = {isDownloaded}; 

     Cursor cursor = db.query(FEED_AUDIO_TABLE, null, where, whereArgs, null, null, null); 
     if(cursor != null && cursor.getCount() > 0) 
     { 
      Log.d(TAG, "getAudioForDownload cursor count is: "+cursor.getCount()); 

      while(cursor.moveToNext()) 
      { 
       gridSelected = cursor.getString(cursor.getColumnIndex(FEED_AUDIO_AUDIO)); 

       arrayList.add(gridSelected); 
      } 
     } 

     db.close(); 

     Log.d(TAG, "getAudioForDownload arrayList size is: "+arrayList.size()); 

     return arrayList; 
    } 
}