JPA中调用含有IN、OUT、INOUT参数的存储过程

  上篇文章提到过在JPA中调用Mysql分页的存储过程,经过查找资料,发现JPA中有@NamedStoredProcedureQuery注解来专门处理JPA对存储过程的调用,并包含了对存储过程中IN、OUT、INOUT参数的处理。现整合了一个 SpringBoot + JPA + fastJSON 的Demo,实现了对Mysql存储过程的调用。用fastJSON 纯属为了将返回的分页数据封装成类似JPA中的Page返回类型。

实体类:

@Entity
@Table(name = "people")
@NamedStoredProcedureQuery(
        name = "proc_page",
        procedureName = "proc_page",
        parameters = {
                @StoredProcedureParameter(mode = ParameterMode.IN, name = "tab",type = String.class),
                @StoredProcedureParameter(mode = ParameterMode.INOUT, name = "startItem",type = Integer.class),
                @StoredProcedureParameter(mode = ParameterMode.INOUT, name = "size",type = Integer.class),
                @StoredProcedureParameter(mode = ParameterMode.INOUT, name = "sortRule",type = String.class),
                @StoredProcedureParameter(mode = ParameterMode.IN, name = "order_field",type = String.class),
                @StoredProcedureParameter(mode = ParameterMode.OUT,name = "totalElements",type= Integer.class),
                @StoredProcedureParameter(mode = ParameterMode.OUT,name = "pageCount",type = Integer.class ),
                @StoredProcedureParameter(mode = ParameterMode.OUT,name = "isFirst",type = String.class ),
                @StoredProcedureParameter(mode = ParameterMode.OUT,name = "isLast",type = String.class )})
Service层:


@PersistenceContext 
private EntityManager entityManager; 

public JSONObject Page(JSONObject code){ //模仿JPA中 返回值为Page类型 的参数类型,封装成JSONObject 并返回   
    String tableName = code.getString("Name"); 
    int start = code.getInteger("start"); 
    int size = code.getInteger("size"); 
    String order_by = code.getString("sort_Rule"); 
    String order_field = code.getString("order_field"); //此处参数需与实体类中对应  
    StoredProcedureQuery query = entityManager.createNamedStoredProcedureQuery("proc_page") 
                                              .setParameter("tab",tableName) .setParameter("startItem",start) 
                                              .setParameter("size",size) .setParameter("sortRule",order_by) 
                                              .setParameter("order_field",order_field); 

    List list = query.getResultList(); query.execute();  //通过getOutputParameterValue方法获取存储过程中的OUT参数值  
    int pageCount = (int) query.getOutputParameterValue("pageCount"); 
    int number = (int) query.getOutputParameterValue("startItem"); 
    int Size = (int) query.getOutputParameterValue("size"); 
    String sort = (String) query.getOutputParameterValue("sortRule"); 
    int totalElements =(int) query.getOutputParameterValue("totalElements"); 
    String isFirst = (String) query.getOutputParameterValue("isFirst"); 
    String isLast = (String) query.getOutputParameterValue("isLast"); 
    if (sort.equals (null) || sort == ""){ 
                  //该处纯属为了模仿 JPA 中 Page 返回的参数类型  
                  sort = "null"; 
          } 
    //将返回参数put进JSONObject,一并返回  
    JSONObject jsonObject = new JSONObject(); 
    jsonObject.put("totalPage",pageCount); 
    jsonObject.put("totalElements",totalElements); 
    jsonObject.put("number",number); 
    jsonObject.put("size",Size); 
    jsonObject.put("sort",sort); 
    jsonObject.put("isFirst",isFirst); 
    jsonObject.put("isLast",isLast); 
    jsonObject.put("content",list); return jsonObject; 
}

Controller层:

@Autowired private 
ProcedureService service; 

@RequestMapping(value = "/findAll",method = RequestMethod.POST) 
public JSONObject findAll(@RequestBody JSONObject code){ 
    Long start = System.currentTimeMillis(); 
    JSONObject object = service.Page(code); 
    Long end = System.currentTimeMillis(); 
    System.out.println("存储过程分页用时:" + (end - start) + "ms"); return object; 
}

本人是用的Swagger进行测试的,同样的数据下,测试结果和JPA的分页速度相差无几,稍微快上那么一丢丢,5毫秒以内。至于该Demo中的存储过程,用的是上一篇博文中的。

 

 

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