问题描述
我最近开始使用 JDeveloper 12c 处理我的第一个 ADF 项目。
所以，我有一个连接到 Oracle 数据库的 Fusion Web 应用程序。在 jsf 页面之一上有两个 ADF 表，它们显示来自数据库的数据。下面是一个向数据库发送“DELETE”语句以删除选定条目的按钮。由于两个表必须在此之后刷新的原因（删除会影响两个表的显示条目）。
当我对表格显示正确的数据感到非常高兴并且按钮也做了它的事情之后，我很快意识到如果数据库发生变化，jsf 页面中的表格将不会自动刷新。我在网上搜索了一些关于如何在 ADF Fusion 应用程序中刷新 jsf 页面元素的入门级教程。遗憾的是，到目前为止，我没有找到任何可以让我找到它的关键的东西。
我在 Oracle HQ 页面上找到了 this article，但它也有使用许多专有命名的习惯，并且是用流动的文本编写的，所以里面没有代码示例或片段或类似的东西，这使得它新手很难跟上。
这是我的托管 java bean 中的一个片段，我在其中存储了我的按钮功能：
public String update() {
getDBConnection c = new DBConnection();
Connection conn = c.getConn();
RowKeySet selectedEntries = getDetailTable().getSelectedRowKeys();
Iterator selectedEntryIter = selectedEntries.iterator();
DCBindingContainer bindings = (DCBindingContainer)BindingContext.getCurrent().getCurrentBindingsEntry();
DCIteratorBinding entryIter = bindings.findIteratorBinding("my_iterator");
RowSetIterator rSIter = entryIter.getRowSetIterator();
try {
PreparedStatement pstmt1 = conn.prepareStatement("DELETE ...");
PreparedStatement pstmt2 = conn.prepareStatement("DELETE ...");
while(selectedEntryIter.hasNext()){
Key key = (Key)((List)selectedEntryIter.next()).get(0);
Row currentRow = rSIter.getRow(key);
BigDecimal barcode = (BigDecimal) currentRow.getAttribute("id");
BigDecimal field1 = (BigDecimal) currentRow.getAttribute("field1");
BigDecimal field2 = (BigDecimal) currentRow.getAttribute("field2");
pstmt1.setBigDecimal(1,id);
pstmt1.setBigDecimal(2,field1);
pstmt2.setBigDecimal(1,id);
pstmt2.setBigDecimal(2,field2);
pstmt1.executeUpdate();
pstmt2.executeUpdate();
}
conn.commit();
//i guess here i have to trigger to refresh the tables but I have pretty to no clue of how to do that
//where do I have to set the functionality? I read sth about creating another bean in the "session" package
//but somehow i have to access the jsf i want to have refreshed. Where do I create that connection?
//even a simple example or a good reference to a tutorial would be helpful for me
} catch (sqlException e) {
System.out.println(e.getMessage());
}
return null;
}
可能这个问题与现有问题重复，我太笨了找不到它，但无论如何我都会试一试。提前致谢！
解决方法
在你的情况下，你可以简单地添加一个 entryIter.executeQuery();在您的 conn.commit() 之后； （您还应该避免运行直接的 sql delete 并使用标准的 ADF BC DELETE https://o7planning.org/11489/create-update-and-delele-data-using-adf-form-in-adf-bc#a9769791）
但是为了回答未来查询的问题标题，下面是一个简单的刷新表按钮示例，易于重复使用，我通常会在我的客户表工具栏上添加该按钮：
//in your jsff
<af:panelCollection id="pc" >
<f:facet name="menus"/>
<f:facet name="statusbar"/>
<f:facet name="toolbar">
<af:toolbar id="t1" flex="5">
<af:group id="g1">
<af:commandImageLink shortDesc="Reload" partialSubmit="true" actionListener="#{YOUR_SCOPE.YOUR_BEAN.refreshTable}"
icon="#{resource['images:YOUR_RELOAD_ICON.png']}">
<f:attribute name="tableIdToRefresh" value="YOUR_TABLE_ID"/>
</af:commandImageLink>
</af:group>
</af:toolbar>
</f:facet>
<af:table id="YOUR_TABLE_ID" value="#{bindings.YOUR_VO.collectionModel}" var="row" rows="#{bindings.YOUR_VO.rangeSize}"
selectedRowKeys="#{bindings.YOUR_VO.collectionModel.selectedRow}" selectionListener="#{bindings.YOUR_VO.collectionModel.makeCurrent}" rowSelection="single"
fetchSize="#{bindings.YOUR_VO.rangeSize}" filterModel="#{bindings.XxcnVieIntSearchVCQuery.queryDescriptor}"
queryListener="#{bindings.XxcnVieIntSearchVCQuery.processQuery}" varStatus="vs" >
<!-- COLUMNS -->
</af:table>
</af:panelCollection>
//in your bean #{YOUR_SCOPE.YOUR_BEAN.refreshTable}
public void refreshTable(ActionEvent actionEvent) {
//Get the attribute tableIdToRefresh value. I like to have it as a jsff attribute so i can easily reuse the button elsewhere
String tableToRefreshId = "" + ((RichCommandImageLink)actionEvent.getSource()).getAttributes().get("tableIdToRefresh");
if (sValeurCode != null) {
addPprToComponentById(tableToRefreshId);
//If it doesn't suffice (see below) you can use this :
//refreshTableIterator(tableToRefreshId);
}
}
public static void addPprToComponentById(String id) {
Object component = findComponentInRoot(id); //from the great JSFUtils library
if (component != null) {
AdfFacesContext.getCurrentInstance().addPartialTarget((UIComponent)component);
AdfFacesContext.getCurrentInstance().partialUpdateNotify((UIComponent)component);
}
}
/**
* Locate an UIComponent in view root with its component id. Use a recursive way to achieve this.
* @param id UIComponent id
* @return UIComponent object
*/
public static UIComponent findComponentInRoot(String id) {
UIComponent component = null;
if (id != null) {
FacesContext facesContext = FacesContext.getCurrentInstance();
if (facesContext != null) {
UIComponent root = facesContext.getViewRoot();
if (root != null) {
component = findComponent(root,id);
}
}
}
return component;
}
您也可以将此 addPPR 逻辑用于其他组件。
如果一个简单的 ppr 还不够。您可以使用这些强制执行表查询：
public static void refreshTableIterator(String tableId) {
RichTable table = findComponentInRoot(tableId);
DCIteratorBinding treeIterator = null;
if (table != null) {
treeIterator = getTableIterator(table);
if (treeIterator != null) {
RowSetIterator rsi = treeIterator.getRowSetIterator();
treeIterator.executeQuery();
rsi.closeRowSetIterator();
}
}
}
public static DCIteratorBinding getTableIterator(RichTable table) {
DCIteratorBinding treeIterator = null;
CollectionModel model = (CollectionModel)table.getValue();
if (model != null) {
JUCtrlHierBinding treeBinding = (JUCtrlHierBinding)model.getWrappedData();
if (treeBinding != null) {
treeIterator = treeBinding.getDCIteratorBinding();
}
}
return treeIterator;
}