p:dataTable未由PrimeFaces.current().ajax().update更新

我正在开始开发JSF和PrimeFace数据表。我准备了以下xhtml页面：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:p="http://primefaces.org/ui">
<h:head>
<title>Find Capital of Countries</title>
</h:head> 
<h:body> 
<h:form id="FrmTest">
<p:dataTable id="ListSites"  value="#{testing.SiteSearch()}" var="lst" editable="true">
<f:facet name="header">
List of Sites
</f:facet>
<p:column>
<f:facet name="header">
Site Code
</f:facet>
#{lst.stCode}
</p:column>
<p:column headerText="Site Description">
<h:outputText value="#{lst.stDescription}" />
</p:column>
<p:column  headerText="is Active">
<div style="text-align: center;">
<p:selectBooleanCheckbox value="#{lst.stActive}"  />
</div>
</p:column>
<p:column>
<f:facet name="header">
Site Active
</f:facet>
<div style="text-align: center;">
<h:outputText value= "#{lst.stActive}" />
</div>
</p:column>
<p:column>
<f:facet name="header">
Modified By
</f:facet>
#{lst.modifiedBy}
</p:column>
<p:column>
<f:facet name="header">
Modification Date
</f:facet>
#{lst.modifiedDate}
</p:column>                 
<p:column>
<f:facet name="header">
Has Error
</f:facet>
#{lst.hasError}
</p:column>     
<p:column>
<f:facet name="header">
Error Description
</f:facet>
#{lst.errorDescription}
</p:column>     
<p:column>
<f:facet name="header">
Row State
</f:facet>
#{lst.rowState}
</p:column>     

</p:dataTable>

<h:outputLabel value="Enter Country Name:"/>
<h:inputText id="country" binding="#{testing.country}"
valueChangeListener="#{testing.findCapitalListener}"
immediate="true"
onchange="document.getElementById('findcapital').click();" />
<br/>
<br/>
<h:outputLabel value="Capital is: " />
<h:inputText id="capital" binding="#{testing.capital}" immediate="true"/>
<br/>
<br/>
<h:commandButton  value="Submit" partialSubmit="true" />
<div style="visibility: hidden" >
<h:commandButton id="findcapital" value="findcapital" partialSubmit="true"  immediate="true" />
</div>
</h:form>    
</h:body> 
</html>

我想在名为country的文本框中输入更新名为ListSites的数据表。调用了关联的侦听器(system.out.println已生成(，但没有进行primeface更新。这是听众：

```
public void findCapitalListener(ValueChangeEvent cdl) {
String country = cdl.getNewValue().toString();
System.out.println("Country is : " + country);
StringBuilder capitalCountry = new StringBuilder();
findCapital(country, capitalCountry);
capital.setValue(capitalCountry.toString());    
siteDto = listSiteDto.get(0);
siteDto.setStDescription(capitalCountry.toString());
listSiteDto.set(0, siteDto);
PrimeFaces.current().ajax().update("FrmTest:ListSites");
//System.out.println("Capital is : " + capital.getValue());
//System.out.println("New DTO Description : " + siteDto.getStDescription());
System.out.println("New list Description : " + listSiteDto.get(0).getStDescription());
}
```

问题是由于填充数据表的函数(SiteSearch(((正在从数据库中检索数据。在那个阶段，我想在更新数据库之前刷新页面显示。我用list getter替换了这个函数，现在一切都正常了。

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