当方法执行更新时刷新延迟加载的 Primefaces 数据表

Posted 2023-02-23

【中文标题】当方法执行更新时刷新延迟加载的 Primefaces 数据表

【英文标题】：refresh lazy loaded Primefaces datatable when a method performs an update

【发布时间】：2015-01-30 05:16:42

【问题描述】：

当我通过 JDBC 方法更新数据库中的数据时，它会被持久化，但 primefaces 数据表不会被刷新。刷新页面也不会显示此更改，但仅当重新启动服务器并且再次调用我的 init 时才能看到此更改。在我使用这种 JDBC 方法保存数据后，有没有办法让 Primefaces 刷新它的数据表内容？

注意：JDBC 方法不同于为数据库实体执行添加/更新/删除的托管 bean。

我希望我的问题足够清楚。

这是我的数据表：

<p:dataTable value="#warehouseManagedBean.lazyModel" 
var="showStock"
widgetVar="warehouseTable"
rows="10" 
rowsPerPageTemplate="20,30,50" 
paginator="true" 
lazy="true"
paginatorTemplate="CurrentPageReport  FirstPageLink PreviousPageLink PageLinks NextPageLink LastPageLink RowsPerPageDropdown">              
<p:column headerText="Raw Material" sortBy="#showStock.rwcode" filterBy="#showStock.rwcode" filterStyle="display:none; visibility:hidden;"> 
<h:outputText value="#showStock.rwcode"/>
</p:column>
<p:column headerText="Stock Balance">                                         
<h:outputText value="#showStock.quantity"/>
</p:column>
<p:column headerText="Cost">                                        
<h:outputText value="#showStock.cost"/>
</p:column>
<p:column headerText="Value">                                         
<h:outputText value="#showStock.stockValue"><f:convertNumber type="currency" currencySymbol="$"/></h:outputText>
</p:column>
<p:column rendered="false">                                         
<h:outputText value="#showStock.stockid"/>
</p:column>
</p:dataTable>

这是我的 JDBC 方法（如果需要）

public void updateWarehouse(double stockbalance, int id) throws SQLException
conman = new PremierConnection();
String sql = "update warehouse set quantity = ? where stockid = ?";
Connection conn = null;
PreparedStatement stm = null;

try 
    conn = conman.getDBConnection();
    stm = conn.prepareStatement(sql);
    stm.setDouble(1, stockbalance);
    stm.setInt(2, id);
    stm.executeUpdate();            
 catch (SQLException e) 
        System.out.println(e.getMessage());
     finally 
        if (stm != null) 
            stm.close();
        
        if (conn != null) 
            conn.close();
        
    

更新：Warehousemanagedbean

@Named(value = "warehouseManagedBean")
@ViewScoped
public class WarehouseManagedBean implements Serializable

    private LazyDataModel<Warehouse> lazyModel;    
    private Warehouse stock = new Warehouse();

    @EJB
    private WarehouseEJB ejb;

    @PostConstruct
    public void init()
        lazyModel = new LazyWarehouseDataModel(ejb);
        

    public String newStock()
        try 
            stock = ejb.create(stock);
            JsfUtil.addSuccessMessage("Stock created successfully");
         catch (EJBException e)
            JsfUtil.addErrorMessage("Raw material exists");
            return "AddStock.xhtml";
         catch (Exception e) 
                Logger.getLogger(WarehouseManagedBean.class.getName()).log(Level.SEVERE, "Error creating new stock", e);            
        
        return "Warehouse.xhtml";
    

    public String newNextStock()
        try 
            stock = ejb.create(stock);
            JsfUtil.addSuccessMessage("Stock created successfully");            
         catch (EJBException e)
            JsfUtil.addErrorMessage("Raw material exists");
         catch (Exception e) 
                Logger.getLogger(WarehouseManagedBean.class.getName()).log(Level.SEVERE, "Error creating new stock", e);            
        
        return "AddStock.xhtml";
    

    public String saveStock()
        try 
            ejb.edit(stock);
            JsfUtil.addSuccessMessage("Stock updated successfully");
         catch (EJBException e)
            JsfUtil.addErrorMessage("Error updating stock");
            return "EditStock.xhtml";
         catch (Exception e) 
                Logger.getLogger(WarehouseManagedBean.class.getName()).log(Level.SEVERE, "Error updating stock", e);            
        
        return "Warehouse.xhtml";
    

    public void deleteStock(Warehouse stock)
        try 
            ejb.remove(stock);
            JsfUtil.addSuccessMessage("Stock deleted successfully");            
         catch (EJBException e)
            JsfUtil.addErrorMessage("Error deleting stock");
        catch (Exception e) 
                Logger.getLogger(WarehouseManagedBean.class.getName()).log(Level.SEVERE, "Error deleting stock", e);            
        
    

    public Warehouse getStock() 
        return stock;
    

    public List<Warehouse> getWarehouseList() 
        return warehouseList;
    

    public LazyDataModel<Warehouse> getLazyModel() 
        return lazyModel;
        

【问题讨论】：

可以发warehouseManagedBean的代码吗？

@PredragMaric 我刚刚做了

【参考方案1】：

问题可能是lazyModel 即使在您更新数据库后仍然有旧数据。更新库存后尝试再次调用init()（是saveStock()？），当然您应该在该操作完成后更新<p:dataTable>组件（如果尚未设置，请添加dataTable的ID到调用saveStock()的按钮的update属性。