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      • sql語句大全之MSSQL sql存儲過程創建簡介及應用舉

      • 2019-05-03 14:52 來源:未知

      MSSQL存儲過程簡介


      存儲過程的概念:我們將一組常用、經常重復使用的sql,采用一個包名進行定義,并將其放入數據庫中,作為DB服務器中的一個對象,對外服務,我們將此包稱之為”存儲過程”。

      存儲過程的優點:
      1 存儲過程作為服務器對象,所以運行存儲過程中的sql塊,通常比sql塊速度更快,效率更高。
      2 存儲過程將sql塊存儲在數據庫對象中,減少了客戶端同服務器端通信的數據塊大小,減輕網絡瀏覽。
      3 存儲過程將sql塊封裝為一個包,增加了sql代碼的可讀性和sql代碼調試的便利性。
      4 存儲過程作為db服務器中的一個對象,我們可以通過相應的權限設置,來限制客戶端操作數據庫的權限,增加db服務器的安全性。



      存儲過程的缺點:
      1 存儲過程作為db服務器對象,在后臺進行大量的運算,加大了DB服務器的壓力。
      2 存儲過程作為db服務器對象,里面包含了不同類型的sql語法,所以存儲過程不方便不同類型數據庫的移植操作。
      3 對應用系統而言,由于業務邏輯存在程序代碼和存儲過程中,所以加大了應用程序的維護難度。

       



      存儲過程的應用場景:
      1 數據庫倉庫抽取數據
      2 超大型報表獲取獲取
      3 超復雜的sql業務邏輯代碼編寫

      MSSQL存儲過程舉例應用

       


      mssql 存儲過程語法:

      create proc 存儲過程名稱 
      參數名1 參數類型 [參數默認值] [是否為輸出參數],
      參數名2 參數類型 [參數默認值] [是否為輸出參數]
      ...
       [with {RECOMPILE|ENCRYPTION|RECOMPILE,ENCRYPTION}]
      as 
      /*sql 代碼塊*/
      
      存儲過程名稱最大長度不能超過256個字符
      with recompile:代表每次調用存儲過程,db服務器都為對存儲過程進行重編譯,清除buffer pool中的緩存信息
      with ENCRYPTION:加密存儲過程
      with recompile, ENCRYPTION:重編譯存儲過程和加密存儲過程
      
      
      
        create table A (keyId int)
        insert into A(keyId)values(1),(10),(100),(1000),(10000),(100000),(100000),(2)
          
        /*創建存儲過程*/
         /*創建存儲過程查詢數據表數據*/
         create proc pr_showTableAInfo
         as
         begin
         select keyId from  A 
         end 
         go 
         /*執行存儲過程*/
         exec  pr_showTableAInfo 
         go
         
         /*創建存儲過程返回多張數據表數據*/
         create proc pr_showTableAInfo
         as
         begin
         select keyId from  A 
         select '這是第二張數據表' as table 
         end 
         go 
         /*執行存儲過程*/
         exec  pr_showTableAInfo 
         go 
         


      /*創建帶輸出參數的存儲過程*/
      create proc pr_t
      @a int,
      @b varchar(36) output
      as
      begin
      set @b=NEWID() ----對output參數賦值
      select 'test',@b as t ---返回數據表
      end
      go
      /*調用帶output參數的存儲過程方法*/
      declare @t2 varchar(36)
      exec pr_t 1,@t2 output ----設置調用參數屬性為output,存儲過程中的數值,則會傳送至外部變量中
      select @t2 as [backValue]
      go


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