我仍然是Adobe Air / Flex的新手，而且还是SQL的新手。
我已经下载了这个（http://coenraets.org/blog/2008/11/using-the-sqlite-database-access-api-in-air ... -part-1 /）代码并且一直在查看它，我正在尝试实现不同的想法。
我正在使用这种形式的画布。
MaterialForm.mxml由面板CadastroMaterial.mxml调用，该面板还显示一个数据网格，其中包含从此表单保存的信息。
sql语句由MaterialEvent.as使用lib flexlib。
创建我在从数据网格到组合框中获取数据时遇到问题，我这样做是为了获取数据：
<mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml" xmlns="*" width="388" height="475" creationComplete="init()" label="{_material.material_id > 0 ? _material.tipo : 'Novo Material'}">
<mx:Script>
<![CDATA[
import mx.controls.Alert;
import mx.managers.PopUpManager;
import Eventos.MaterialEvent;
import Eventos.TMaterialEvent;
import Formularios.TMaterialForm;
import mx.collections.ArrayCollection;
[Bindable] private var tMateriais:ArrayCollection;
// Para criar a conexão com o banco de dados
private function openDatabase():void
{
var file:File = File.applicationDirectory.resolvePath("bd/SISC.db");
sqlConnection = new SQLConnection();
sqlConnection.open(file);
// Para verificar se o banco de dados já existe se sim utiliza-o senão cria um novo, não é útil se não cria a tabela
//var isNewDB:Boolean = !file.exists;
//if (isNewDB) createDatabase();
findAll();
}
// Para selecionar a tabela do banco de dados desejada
private function findAll():void
{
var stmt:SQLStatement = new SQLStatement();
stmt.sqlConnection = sqlConnection;
stmt.text = "SELECT tmaterial FROM TMATERIAL";
stmt.execute();
tMateriais = new ArrayCollection(stmt.getResult().data);
}
[Bindable] public var _material:Object;
public var sqlConnection:SQLConnection;
private var validators:Array;
private function init():void
{
validators = [tipoValidator, responsavelValidator, compartimentoValidator];
openDatabase();// colocado para abrir o banco de outro lugar
}
public function set material(material:Object):void
{
_material = material;
}
public function get material():Object
{
return _material;
}
private function save():void
{
if (Validator.validateAll(validators).length>0)
{
return;
}
_material.tipo = tipo.text;
_material.num = num.text;
_material.responsavel = responsavel.text;
_material.compartimento = compartimento.text;
_material.observacoes = observacoes.text;
if (_material.material_id > 0)
{
update();
}
else
{
insert();
}
}
private function insert():void
{
try
{
var stmt:SQLStatement = new SQLStatement();
stmt.sqlConnection = sqlConnection;
stmt.text =
"INSERT INTO material (tipo, num, responsavel, compartimento, observacoes) " +
"VALUES (:tipo, :num, :responsavel, :compartimento, :observacoes)";
stmt.parameters[":tipo"] = _material.tipo;
stmt.parameters[":num"] = _material.num;
stmt.parameters[":responsavel"] = _material.responsavel;
stmt.parameters[":compartimento"] = _material.compartimento;
stmt.parameters[":observacoes"] = _material.observacoes;
stmt.execute();
_material.material_id = stmt.getResult().lastInsertRowID;
label = _material.tipo;
dispatchEvent(new MaterialEvent(MaterialEvent.CREATE, _material, true));
}
catch (error:SQLError)
{
Alert.show(error.details, "Erro");
}
}
private function update():void
{
try
{
var stmt:SQLStatement = new SQLStatement();
stmt.sqlConnection = sqlConnection;
stmt.text =
"UPDATE material set " +
"tipo=:tipo, " +
"num=:num, " +
"responsavel=:responsavel, " +
"compartimento=:compartimento, " +
"observacoes=:observacoes " +
"WHERE material_id=:materialId";
stmt.parameters[":tipo"] = _material.tipo;
stmt.parameters[":num"] = _material.num;
stmt.parameters[":responsavel"] = _material.responsavel;
stmt.parameters[":compartimento"] = _material.compartimento;
stmt.parameters[":observacoes"] = _material.observacoes;
stmt.parameters[":materialId"] = _material.material_id;
stmt.execute();
label = _material.tipo;
dispatchEvent(new MaterialEvent(MaterialEvent.UPDATE, _material, true));
}
catch (error:SQLError)
{
Alert.show(error.details, "Error");
}
}
private function deleteItem():void
{
try
{
var stmt:SQLStatement = new SQLStatement();
stmt.sqlConnection = sqlConnection;
stmt.text = "DELETE FROM material WHERE material_id = :materialId";
stmt.parameters[":materialId"] = _material.material_id;
stmt.execute();
dispatchEvent(new MaterialEvent(MaterialEvent.DELETE, _material, true));
}
catch (error:SQLError)
{
Alert.show(error.details, "Erro");
}
}
]]>
</mx:Script>
<mx:Validator id="tipoValidator" required="true" source="{tipo}" property="text"/>
<mx:Validator id="responsavelValidator" required="true" source="{responsavel}" property="text"/>
<mx:Validator id="compartimentoValidator" required="true" source="{compartimento}" property="text"/>
<mx:Form width="381" height="466">
<mx:FormItem label="Tipo:" required="true">
<mx:ComboBox dataProvider="{tMateriais}" id="tipo" text="{_material.tipo}" width="200"/>
</mx:FormItem>
<mx:FormItem label="Número:">
<mx:TextInput id="num" text="{_material.num}" width="200"/>
</mx:FormItem>
<mx:FormItem label="Responsavel:" required="true">
<mx:TextInput id="responsavel" text="{_material.responsavel}" width="200"/>
</mx:FormItem>
<mx:FormItem label="Compartimento:" required="true">
<mx:TextInput id="compartimento" text="{_material.compartimento}" width="200"/>
</mx:FormItem>
<mx:FormItem label="Observações:">
<mx:TextInput id="observacoes" text="{_material.observacoes}" width="200"/>
</mx:FormItem>
</mx:Form>
<mx:Button label="Salvar" click="save()" left="16" bottom="20"/>
<mx:Button label="Deletar" click="deleteItem()" left="87" bottom="20"/>
但结果出现在组合框[object Object]而不是表格TMATERIAL中插入的材料类型的名称，如果我在另一种形式的表格中插入30个值，则30在组合框中显示为[object Object]我跟踪了这个，错误就是这种形式。谁能帮助我？对不起英语（谷歌翻译）。日Thnx。
答案 0 :(得分：0)
问题是ComboBox需要提示如何显示dataProvider中每个项目的名称。默认情况下，许多Flex组件会在dataProvider中查找具有名为label的属性的元素。如果此类属性存在且为String，则ComboBox将显示该label属性的值。
如果dataProvider中的元素没有label属性，那么Flex组件将在toString()对象上调用dataProvider，在这种情况下会导致输出“[object Object]”。
如果dataProvider中的元素没有label属性，那么您可以通过使用ComboBox的labelField或labelFunction属性告诉ComboBox如何显示名称
使用labelField属性指定dataProvider中可用作标签的属性名称（在您的情况下，我认为这是tipo或{{1} }）
:tipo或者使用<mx:ComboBox dataProvider="{tMateriais}" id="tipo" labelField="tipo" />
属性指定一个函数，该函数将用于为labelFunction中的每个项生成标签。
dataProvider <mx:ComboBox dataProvider="{tMateriais}" id="tipo" labelFunction="myLabelFunction" />
具有以下方法签名：
labelFunction