Question

In Flash builder, I’m struggling with basics of data retrieval from local database. Using Lita, I created a SQLite database with a single basic (item) table located in a “DAO” folder .It is meant to populate a List. and I have 2 problems:

1. How to embed the database (with all its pre-populated data) without recreating it from scratch as shown in many tutorials ?
2. For the purpose of prototyping, how to link the data retrieved a single MXML file directly in the list without creating many other classes (ok, in this cases the number of required classes would be limited) such as :

<?xml version="1.0" encoding="utf-8"?>
<s:View xmlns:fx="http://ns.adobe.com/mxml/2009" 
      xmlns:s="library://ns.adobe.com/flex/spark" 
      title="HomeView" >

<fx:Script>

  <![CDATA[

      import flash.data.SQLConnection
      import flash.data.SQLStatement;
      import flash.filesystem.File;
      import flash.filesystem.FileMode;
      import mx.collections.ArrayCollection;`

      private function get myData():ArrayCollection 
      {
          var stmt:SQLStatement = new SQLStatement();
          stmt.sqlConnection = new SQLConnection();

          stmt.sqlConnection.open(File.applicationStorageDirectory.resolvePath("dao/MyDatabase.db"));
          stmt.text = "SELECT id, name FROM Item";

          stmt.execute();
          var result:Array = stmt.getResult().data;

          if (result)
          {
              var list:ArrayCollection = new ArrayCollection();
              list.source(result); 
              return list; 
          } else {
              return null; 
          } 
      }
      ]]>
    </fx:Script>

    <s:List id="list" top="0" bottom="0" left="0" right="0" 
           dataProvider="{myData}" >
    <s:itemRenderer>
    <fx:Component>
    <s:IconItemRenderer label="{myData.name}">
    </s:IconItemRenderer>
    </fx:Component>
    </s:itemRenderer>
    </s:List>
    </s:View>

Answer 1

Thanks to Marcx and Marcos Placona’s Blog entry on copying database locally I came up with this:

<?xml version="1.0" encoding="utf-8"?>
<s:View xmlns:fx="http://ns.adobe.com/mxml/2009" 
      xmlns:s="library://ns.adobe.com/flex/spark" 
      title="HomeView" >

<fx:Script>

  <![CDATA[

      import flash.data.SQLConnection
      import flash.data.SQLStatement;
      import flash.filesystem.File;
      import flash.filesystem.FileMode;
      import mx.collections.ArrayCollection;

      private function get myData():ArrayCollection 
      {
          var myData:String = "dao/MyDatabase.db";
          var embededSessionDB:File = File.applicationDirectory.resolvePath(myData);
          var writeSessionDB:File = File.applicationStorageDirectory.resolvePath(myData);
          // If a writable DB doesn't exist, we then copy it into the app folder so it's writteable
          if (!writeSessionDB.exists) 
          {
             embededSessionDB.copyTo(writeSessionDB);
          }

          var stmt:SQLStatement = new SQLStatement();
          stmt.sqlConnection = new SQLConnection();

          stmt.sqlConnection.open(File.applicationStorageDirectory.resolvePath(myData));
          stmt.text = "SELECT id, name FROM Item";

          stmt.execute();
          var result:Array = stmt.getResult().data;

            stmt.execute();
            var result:Array = stmt.getResult().data;
            var r:ArrayCollection = new ArrayCollection();

            if (result)
            {      
                r.source = result; 
                return r;
            }else{
                return null;
            } 
      }

      [Bindable]private var resultArr:ArrayCollection = getData();

      ]]>

    </fx:Script>

    <s:List id="list" top="0" bottom="0" left="0" right="0" 
           dataProvider="{myData}" label="name">
    </s:List>
    </s:View>