Question

关于我：
我刚开始。我知道必须有一个简单的方法来做到这一点，但一周后我仍然难倒它是什么：
我已经制作了一个应用来取代一个很长的书面程序。我希望文本输入框填充前面给出的答案，用于他们正在运行的测试问题：
我可以从DB获得正确的信息;但是我不能把它放在文本输入字段中。该框只显示：[object Object]

非常感谢任何帮助。

以下是Settings.mxml页面的示例代码：

<?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="Settings" >
    <fx:Declarations>
        <!-- Place non-visual elements (e.g., services, value objects) here -->
    </fx:Declarations>

    <s:Label id="DB_Name_Label" left="10" top="10" width="150" height="50" fontSize="28"
             text="DB Name" textAlign="right" verticalAlign="middle"/>
    <s:TextInput id="DB_Name_Input" left="170" top="10" width="300" height="50" fontSize="32"/>

    <s:Label id="Test_Title" left="10" top="70" width="150" height="50" fontSize="28"
             text="Test Title" textAlign="right" verticalAlign="middle"/>
    <s:TextInput id="Test_Title_Input" left="170" top="70" width="300" height="50" fontSize="32"/>

    <s:Button id="Equipment_Button" left="10" right="10" top="130" height="50"
              label="Save, then next Page" click="EquipmentButtonClick()"/>

    <fx:Script>
        <![CDATA[
            import mx.collections.ArrayCollection;
            import spark.events.ViewNavigatorEvent;     

            protected var sqlConnection:SQLConnection;

            public function add_info_to_DB(tableName:String, valueToBeSaved:String):void
            {
                sqlConnection = new SQLConnection();
                sqlConnection.open(File.userDirectory.resolvePath(DB_Name_Input.text+".db"));
                var add2db:SQLStatement = new SQLStatement();
                add2db.sqlConnection = sqlConnection;
                add2db.text = ("CREATE TABLE IF NOT EXISTS "+tableName+" (id INTEGER PRIMARY KEY AUTOINCREMENT, answer TEXT)");
                add2db.execute();

                add2db.text = "INSERT INTO "+tableName+" (answer) VALUES (?)";
                add2db.parameters[0] = valueToBeSaved;
                add2db.execute();
            }

            [bindable] public var testdata:Object= new Object();

            protected function EquipmentButtonClick():void
            {   
                add_info_to_DB("Test_Title",Test_Title_Input.text);         
                navigator.pushView(views.ReadfromDB, testdata);
            }
        ]]>
    </fx:Script>
</s:View>

以下是ReadfromDB.mxml页面的代码：

<?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="Reading" >
    <fx:Declarations>
        <!-- Place non-visual elements (e.g., services, value objects) here -->
    </fx:Declarations>

    <s:Label id="DB_to_Read_Label" left="10" top="10" width="150" height="50" fontSize="28"
             text="DB to Read" textAlign="right" verticalAlign="middle"/>
    <s:TextInput id="DB_to_Read" left="170" top="10" width="300" height="50" fontSize="32"/>

    <s:Label id="Test_Title" left="10" top="70" width="150" height="50" fontSize="28"
             text="Test Title" textAlign="right" verticalAlign="middle"/>
    <s:TextInput id="Test_Title_Input" left="170" top="70" width="300" height="50" fontSize="32"/>

    <s:Button id="Populate_Button" left="10" right="10" top="130" height="50" label="Populate"
              click="PopulateButtonClick()"/>

    <fx:Script>
        <![CDATA[
            import mx.collections.ArrayCollection;
            import spark.events.ViewNavigatorEvent;     

            protected var sqlConnection:SQLConnection;
            public var valueToBeRead:String;

            public function get_DB_info(tableName:String):void
            {   
                sqlConnection = new SQLConnection();
                sqlConnection.open(File.userDirectory.resolvePath(DB_to_Read.text+".db"));
                var add2db:SQLStatement = new SQLStatement();
                add2db.sqlConnection = sqlConnection;
                add2db.text = ("SELECT answer FROM "+tableName+" ORDER BY id DESC LIMIT 1");
                add2db.execute();
                valueToBeRead = add2db.getResult().data.toString();//.valueOf();//.toString();
            }

            protected function PopulateButtonClick():void
            {   
                get_DB_info("Test_Title");  
                Test_Title_Input.text = valueToBeRead;
            }
        ]]>
    </fx:Script>
</s:View>

Answer 1

当您致电add2db.getResult()时，退货对象为SQLResult。有关data属性的信息非常有用。它表示数据属性是包含结果的Array Objects。

在您的情况下，看起来您的SQL查询将返回正好1个数据库行，并且该行只包含一列：answer

因此，您应该能够像这样填充文本输入：

var firstRow:Object = add2db.getResult().data[0];
valueToBeRead = firstRow["answer"];
// or, instead of storing it in a variable, just assign it to the text input right away
Test_Title_Input.text = firstRow["answer"];

Flash Builder 4.5.1从SQLite DB读取，无法将信息显示为文本

1 个答案: