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VB,VBA 利用数组向ORACLE传参

glave posted @ 2009年2月03日 23:40 in ORACLE with tags AddTable VB VBA oracle 数组传参 , 4282 阅读

起因:

         在对多条数据进行更新操作的时候,会频繁的调用INSERT和UPDATE语句,这样导致运行速度会很慢.

         ORACLE数据库提供了MERGE方法,大大加快了处理速度,而且只需做一次操作,但是如何将大批量数据传递给ORACLE呢?

解决办法:

         采用数组的形式,数据的每一列即为一个数组.

实例:   

  1. '定义部分
  2.  Const ORAPARM_INPUT = 1
  3.  Const ORATYPE_VARCHAR2 = 1
  4.  Dim OraPArray(4)
  5.  Dim lArrayIndex As Long
  6.  
  7. '数组大小
  8.  OraDB.Parameters.Add "inSize", 4, ORAPARM_INPUT
  9. '定义数组
  10. OraDB.Parameters.AddTable "HPL", ORAPARM_INPUT, ORATYPE_VARCHAR2, lDays, 5
  11.     ' caltype
  12. OraDB.Parameters.AddTable "CALTYPE", ORAPARM_INPUT, ORATYPE_VARCHAR2, lDays, 6
  13.     ' ymd
  14. OraDB.Parameters.AddTable "YMD", ORAPARM_INPUT, ORATYPE_VARCHAR2, lDays, 10
  15.     ' wkkbn :1,2
  16. OraDB.Parameters.AddTable "WKKBN", ORAPARM_INPUT, ORATYPE_VARCHAR2, lDays, 1
  17.  
  18. Set OraPArray(0) = OraDB.Parameters("HPL")
  19. Set OraPArray(1) = OraDB.Parameters("CALTYPE")
  20. Set OraPArray(2) = OraDB.Parameters("YMD")
  21. Set OraPArray(3) = OraDB.Parameters("WKKBN")
  22.  
  23. '数组赋值
  24. For li_row = 1 To 10000 
  25.         OraPArray(0).put_Value ls_Hpl, lArrayIndex
  26.         OraPArray(1).put_Value ls_calType, lArrayIndex
  27.         OraPArray(2).put_Value ls_ymd, lArrayIndex
  28.         OraPArray(3).put_Value ls_wkkbn, lArrayIndex
  29.        
  30.         lArrayIndex = lArrayIndex + 1
  31. Next
  32.      
  33.     ls_sql = " MERGE INTO F_ACTY.M0030 m0030 " & _
  34.              " USING (SELECT  :CALTYPE  caltype," & _
  35.                             " :YMD   ymd, " & _
  36.                             " :WKKBN  wkkbn, " & _
  37.                             " :HPL hpl " & _
  38.                      "FROM DUAL ) m0030b " & _
  39.              " ON (m0030.caltype = m0030b.caltype  and " & _
  40.                     " m0030.ymd =  m0030b.ymd and " & _
  41.                     " m0030.hpl =  m0030b.hpl ) " & _
  42.             " WHEN MATCHED THEN Update SET m0030.wkkbn = m0030b.wkkbn " & _
  43.             " WHEN NOT MATCHED THEN INSERT ( m0030.caltype, m0030.ymd, m0030.hpl,m0030.wkkbn ) " & _
  44.                                   " Values ( m0030b.caltype , m0030b.ymd ,m0030b.hpl , m0030b.wkkbn ) "
  45.     'Oracle DB处理
  46.     OraDB.ExecuteSQL (ls_sql)
  47.    
  48.     '消除
  49.     OraDB.Parameters.Remove "CALTYPE"
  50.     OraDB.Parameters.Remove "YMD"
  51.     OraDB.Parameters.Remove "WKKBN"
  52.     OraDB.Parameters.Remove "HPL"

 

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