Question

我想删除我的数据库数据。

这是从TextBox的值中获取的AJAX代码：

 SavegeojsonManager add = new SavegeojsonManager();

 @RequestMapping(value = "/deleteGeoJson", method = RequestMethod.GET)
@ResponseBody
public GeoJSON deleteGeoJson( final HttpServletRequest request,@RequestParam("id") final int vectorId) {
    return add.delete(vectorId);
}

这是我的按钮代码：

删除

这是我的控制器（获取方法）

 public GeoJSON delete(int id) {

    GeoJSON geoJson = new GeoJSON();
    try{
        EntityManager em = HibernateSpatialJPA.createEntityManager();
        em.getTransaction().begin();
        //How can I continue ?
       //If there's one thing if it is connected to the data you delete it
      //so cascade ??

    }
    catch (Exception ex)
    {
        ex.printStackTrace();
    }
    return geoJson;
}

这是SavegeojsonManager类codee：

private int id;
 public int getId() { return id; }
public void setId(int id) {  this.id = id; }

}

这是GeoJSON Class：

{{1}}

Answer 1

首先，当您删除实体时，您无法在示例中返回该已删除实体的实例。

您可以这样做：例如，在您<input type="text" onMouseover= "callme(this)">Mouse over me!</span> <script> function callme(obj){ obj.style.color='red' obj.style.otherproperty ='value' . ..... somthing else } </script>的视图中，您可以显示已通过jsp发送的消息。适用于来自Controller部分的ajax请求。

控制器代码：

success

您的代码： 这可以通过多种方式完成：

@RequestMapping(value = "/deleteGeoJson", method = RequestMethod.GET)
@ResponseBody
public String deleteGeoJson( final HttpServletRequest request,@RequestParam("id") final int vectorId) {
    String message = null;
    boolean deleted = add.delete(vectorId);
    if(deleted){
        message = "Geo object has been deleted with id: "+vectorId;
    } else {
        message = "There was some problem with deleting GeoObject"
    }
    return message;
}

如何做hibernate空间删除？

1 个答案: