JPA中調用含有IN、OUT、INOUT參數的存儲過程

  上篇文章提到過在JPA中調用Mysql分頁的存儲過程，經過查找資料，發現JPA中有@NamedStoredProcedureQuery註解來專門處理JPA對存儲過程的調用，幷包含了對存儲過程中IN、OUT、INOUT參數的處理。現整合了一個 SpringBoot + JPA + fastJSON 的Demo，實現了對Mysql存儲過程的調用。用fastJSON 純屬爲了將返回的分頁數據封裝成類似JPA中的Page返回類型。

實體類：

@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層：

@PersistenceContext
private EntityManager entityManager;
public JSONObject Page(JSONObject code){ //模仿JPA中 返回值爲Page類型 的參數類型，封裝成JSONObject 並返回

    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");

    //此處參數需與實體類中對應
    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();

    //通過getOutputParameterValue方法獲取存儲過程中的OUT參數值
     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 == ""){ //該處純屬爲了模仿 JPA 中 Page 返回的參數類型
        sort = "null";
    }

    //將返回參數put進JSONObject，一併返回
    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層：

@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("存儲過程分頁用時：" + (end - start) + "ms");
    return object;

}

本人是用的Swagger進行測試的，同樣的數據下，測試結果和JPA的分頁速度相差無幾，稍微快上那麼一丟丟，5毫秒以內。至於該Demo中的存儲過程，用的是上一篇博文中的。