SQLite and HTML

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  Hello world

  I have a problem with Sqlite and the BLOB data type, and Google was not helpful, because I guess that there is no just enough examples yet...

  What I do is the following: I use sqlite to store Images as blobs, as seen here. The table has only two columns, url TEXT and BLOB value

               connection.begin();
  
                sql = "INSERT INTO blobs (url, value) VALUES (@a, @b)";               sqlStatement.text = sql;
  
                for (var i:int = 0, n:int = images.length; i < n; i++)             {                 sqlStatement.parameters["@a"] = images[i].url;                    sqlStatement.parameters["@b"] = images[i].data;                   sqlStatement.execute();                   sqlStatement.clearParameters();               }
  
                connection.commit();
  

  whereas the images [i] .url are strings, data BitmapData.

  Now the question is: How can I get the image of the BitmapData again? What I'm trying to do is the following

  public function getBlob(url:String = null):Object
          {
              var dp:DataProvider = new DataProvider;
              try {
                  connection.begin(); 
  
                  var sql:String;
  
                  if (url)
                  {
                  sql = "SELECT value FROM blobs WHERE url = @a";
                  sqlStatement.text = sql;
                  sqlStatement.parameters["@a"] = url;
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                  {
                      sql = "SELECT * FROM blobs";
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                  }
                  sqlStatement.execute();
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                  var result:SQLResult = sqlStatement.getResult();
                  for each (var obj:Object in result.data){
                      if (obj != null)
                          dp.addItem(obj);
                  }
  
                  connection.commit();
  
              } catch (e:SQLError) {
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                  alert.message = "Error: " + e.message + "\n" + e.details;
                  alert.modalAlpha = 0.1;
                  alert.dialogSize = DialogSize.SIZE_SMALL;
                  alert.addButton("OK");
                  alert.show(IowWindow.getAirWindow().group);
                  connection.rollback();
                  return null;
              }   
  
              return dp;
          }
  

  and

  var dp:DataProvider = getBlob(_newUrl) as DataProvider;
  trace(dp.data[0].value is BitmapData);
  

  but which always returns false: All that it is said that dp.data [0] .value is an object which I can't access

  Any tips?

  This seems to work, using built bitmapData as byteArray, getPixels, setPixels.

  Thank you

  MIke

  package
  {
      import flash.data.SQLConnection;
      import flash.data.SQLResult;
      import flash.data.SQLStatement;
      import flash.display.Bitmap;
      import flash.display.BitmapData;
      import flash.display.Sprite;
      import flash.errors.SQLError;
      import flash.filesystem.File;
      import flash.geom.Rectangle;
      import flash.utils.ByteArray;
  
      [SWF(width="1024", height="600", backgroundColor="#cccccc", frameRate="30")]
  
      public class SQLBitmapBlob extends Sprite
      {
          private var sqlDatabase:File;
          private var sqlConnection:SQLConnection;
          private var sqlStatement:SQLStatement;
          private var sqlResult:SQLResult;
  
          private static const BITMAP_WIDTH:int = 96;
          private static const BITMAP_HEIGHT:int = 96;
  
          public function SQLBitmapBlob()
          {
              super();
  
              // Init Database
              sqlDatabase = File.applicationStorageDirectory.resolvePath("dbBlob2.db");
              sqlConnection = new SQLConnection();
              sqlConnection.open(sqlDatabase);
              sqlStatement = new SQLStatement();
              sqlStatement.sqlConnection = sqlConnection;
  
              // Create the table if it doesn't exist
              sqlStatement.text = "CREATE TABLE IF NOT EXISTS blob (id INTEGER PRIMARY KEY AUTOINCREMENT, picture BLOB)";
              try{sqlStatement.execute();}
              catch (error:SQLError){trace("SQL STATEMENT: " + sqlStatement.text + "\n Error: " + error.details);}
  
              // Create a random bitmapData
              var bmpData:BitmapData = new BitmapData(BITMAP_WIDTH, BITMAP_HEIGHT, true, 0x000000);
              var bytArray:ByteArray = new ByteArray;
              bmpData.noise(25);
              bytArray.writeBytes(bmpData.getPixels(new Rectangle(0,0, BITMAP_WIDTH, BITMAP_HEIGHT)));
  
              // Save BitmapData to Database
              sqlStatement.text = "INSERT INTO blob (picture) VALUES (@picture)";
              sqlStatement.clearParameters();
              sqlStatement.parameters["@picture"] = bytArray;
              try {sqlStatement.execute();}
              catch (error:SQLError){trace("SQL STATEMENT: " + sqlStatement.text + "\n Error: " + error.details);}
  
              // Preform Select on Database to return row
              var loadedBitmapData:BitmapData = new BitmapData(BITMAP_WIDTH, BITMAP_HEIGHT, true, 0x000000);
              sqlStatement.text = "SELECT * FROM blob WHERE id = last_insert_rowid()";
              sqlStatement.clearParameters();
              try{sqlStatement.execute();}
              catch (error:SQLError){trace("SQL STATEMENT: " + sqlStatement.text + "\n Error: " + error.details);}
  
              // Convert returned data back to bitmapData
              var r:Object = new Object();
              sqlResult = sqlStatement.getResult();
              if (sqlResult.data != null){
                  r = sqlResult.data[0].picture;
                  loadedBitmapData.setPixels(new Rectangle(0,0, BITMAP_WIDTH, BITMAP_HEIGHT), r as ByteArray);
                  trace("Retrievied record id: " + sqlResult.data[0].id + " from db.");
              }
  
              var bmpDisplay:Bitmap = new Bitmap(loadedBitmapData);
              addChild(bmpDisplay);
          }
      }
  }
  

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