java - 使用 Entity 和 EntityClass 从数据库填充 jTable 太慢

Question

我创建了一个 jtable，然后将数据库拖放到其中，这样它就会自动在表中生成所有列。

问题是，加载时间太长，比如二十秒。

有什么办法可以优化吗？

当我直接在 MySQL Workbench 上运行查询时，大约需要两秒钟。

生成代码的相关部分:

    bindingGroup = new org.jdesktop.beansbinding.BindingGroup();

    MyDbPUEntityManager = java.beans.Beans.isDesignTime() ? null : javax.persistence.Persistence.createEntityManagerFactory("MyDbPU").createEntityManager();
    userQuery = java.beans.Beans.isDesignTime() ? null : MyDbPUEntityManager.createQuery("SELECT u FROM User u");
    userList = java.beans.Beans.isDesignTime() ? java.util.Collections.emptyList() : userQuery.getResultList();


    org.jdesktop.swingbinding.JTableBinding jTableBinding = org.jdesktop.swingbinding.SwingBindings.createJTableBinding(org.jdesktop.beansbinding.AutoBinding.UpdateStrategy.READ_WRITE, userList, jTable1);
    org.jdesktop.swingbinding.JTableBinding.ColumnBinding columnBinding = 

jTableBinding.addColumnBinding(org.jdesktop.beansbinding.ELProperty.create("${id}"));
    columnBinding.setColumnName("Id");
    columnBinding.setColumnClass(Integer.class);
    columnBinding.setEditable(false);
    columnBinding = 

jTableBinding.addColumnBinding(org.jdesktop.beansbinding.ELProperty.create("${nome}"));
    columnBinding.setColumnName("Nome");
    columnBinding.setColumnClass(String.class);
    columnBinding.setEditable(false);
    columnBinding = 

jTableBinding.addColumnBinding(org.jdesktop.beansbinding.ELProperty.create("${sexo}"));
    columnBinding.setColumnName("Sexo");
    columnBinding.setColumnClass(String.class);
    columnBinding.setEditable(false);
    columnBinding = 

jTableBinding.addColumnBinding(org.jdesktop.beansbinding.ELProperty.create("${cpf}"));
    columnBinding.setColumnName("CPF");
    columnBinding.setColumnClass(String.class);
    columnBinding.setEditable(false);
    columnBinding = 

jTableBinding.addColumnBinding(org.jdesktop.beansbinding.ELProperty.create("${cidade}"));
    columnBinding.setColumnName("Cidade");
    columnBinding.setColumnClass(String.class);
    columnBinding.setEditable(false);
    columnBinding = 

jTableBinding.addColumnBinding(org.jdesktop.beansbinding.ELProperty.create("${estado}"));
    columnBinding.setColumnName("Estado");
    columnBinding.setColumnClass(String.class);
    columnBinding.setEditable(false);
    columnBinding = 

jTableBinding.addColumnBinding(org.jdesktop.beansbinding.ELProperty.create("${ndoc}"));
    columnBinding.setColumnName("RG");
    columnBinding.setColumnClass(String.class);
    columnBinding.setEditable(false);
    columnBinding = 

jTableBinding.addColumnBinding(org.jdesktop.beansbinding.ELProperty.create("${dataNasc}"));
    columnBinding.setColumnName("Data Nascimento");
    columnBinding.setColumnClass(String.class);
    columnBinding.setEditable(false);
    bindingGroup.addBinding(jTableBinding);
    jTableBinding.bind();

Answer 1

Is org.jdesktop.beansbinding a bad choice?

绑定(bind)无关紧要。由于数据库访问延迟本质上是随机的，因此应该在单独的线程上进行以避免阻塞 Swing event dispatch thread (EDT) 。同时，所有 GUI 更新都必须在 EDT 上完成。 SwingWorker非常适合此目的。可以看到使用 org.jdesktop.beansbinding 的工作线程的完整示例 here .

Are there faster, better alternatives?

Profiling可以指导您寻找最佳性能。