배열의 요소 수를 기준으로 런타임에 sqlite 테이블을 만들 수 있습니까?

Question

열 이름이 다른 arraylist가 있습니다. 나는 전달한 arraylist를 기반으로 테이블을 만들어야하는 generatized create 메서드를 갖고 싶습니다. 테이블을 동적으로 생성 할 수있는 구조를 가질 수 있습니까? 해결책을 제안하십시오.

private static class OpenHelper extends SQLiteOpenHelper { 

     OpenHelper(Context context) { 
     super(context, DATABASE_NAME, null, DATABASE_VERSION); 
     System.out.println("openhelper1"); 

    } 

    @Override 
    public void onCreate(SQLiteDatabase db) { 
     Log.d("**DataHelper", "***********in oncreate"); 
     db.execSQL("CREATE TABLE " + TABLE_NAME + " (username TEXT,altnum TEXT,passkey TEXT,flag TEXT)"); 

    } 


    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
     Log.w("Example", "Upgrading database, this will drop tables and recreate."); 
     db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME); 
     onCreate(db); 
    } 
} 

Answer 1

나는 테이블을 생성하고 값을 generatized 방식으로 삽입하기 위해 자체 클래스를 만들었습니다. 네하 @

public void createDynamicDatabase(Context context,String tableName,ArrayList<String> title) { 

      Log.i("INSIDE createLoginDatabase() Method","*************creatLoginDatabase*********"); 
      try { 

       int i; 
       String querryString; 
       myDataBase = context.openOrCreateDatabase("Db",Context.MODE_WORLD_WRITEABLE, null);   //Opens database in writable mode. 
       //System.out.println("Table Name : "+tableName.get(0)); 

       querryString = title.get(0)+" VARCHAR(30),"; 
       Log.d("**createDynamicDatabase", "in oncreate"); 
       for(i=1;i<title.size()-1;i++) 
       {    
        querryString += title.get(i); 
        querryString +=" VARCHAR(30)"; 
        querryString +=","; 
       } 
       querryString+= title.get(i) +" VARCHAR(30)"; 

       querryString = "CREATE TABLE IF NOT EXISTS " + tableName + "("+querryString+");"; 

       System.out.println("Create Table Stmt : "+ querryString); 

       myDataBase.execSQL(querryString); 

      } catch (SQLException ex) { 
       Log.i("CreateDB Exception ",ex.getMessage()); 
      } 
     } 
     public void insert(Context context,ArrayList<String> array_vals,ArrayList<String> title,String TABLE_NAME) { 
      Log.d("Inside Insert","Insertion starts for table name: "+TABLE_NAME); 
      myDataBase = context.openOrCreateDatabase("Db",Context.MODE_WORLD_WRITEABLE, null);   //Opens database in writable mode. 
      String titleString=null; 
      String markString= null; 
      int i; 
      titleString = title.get(0)+","; 
      markString = "?,"; 
      Log.d("**createDynamicDatabase", "in oncreate"); 
      for(i=1;i<title.size()-1;i++) 
      {    
       titleString += title.get(i); 
       titleString +=","; 
       markString += "?,"; 
      } 
      titleString+= title.get(i); 
      markString += "?"; 

      //System.out.println("Title String: "+titleString); 
      //System.out.println("Mark String: "+markString); 


      INSERT="insert into "+ TABLE_NAME + "("+titleString+")"+ "values" +"("+markString+")"; 
      System.out.println("Insert statement: "+INSERT); 
      //System.out.println("Array size iiiiii::: "+array_vals.size()); 
      //this.insertStmt = this.myDataBase.compileStatement(INSERT); 
      int s=0; 

      while(s<array_vals.size()){ 

      System.out.println("Size of array1"+array_vals.size()); 
        //System.out.println("Size of array"+title.size()); 
      int j=1; 
      this.insertStmt = this.myDataBase.compileStatement(INSERT); 
      for(int k =0;k< title.size();k++) 
      { 

       //System.out.println("Value of column "+title+" is "+array_vals.get(k+s)); 
       //System.out.println("PRINT S:"+array_vals.get(k+s)); 
       System.out.println("BindString: insertStmt.bindString("+j+","+ array_vals.get(k+s)+")"); 
       insertStmt.bindString(j, array_vals.get(k+s)); 



       j++; 
      } 

      s+=title.size(); 

      } 
      insertStmt.executeInsert(); 
     }