c# - 更新多行就像批量插入一样

Question

我正在使用以下场景进行批量插入。

Dim queryBuilder As New StringBuilder
queryBuilder.Append("Insert into myTable(col1,col2)values")
Dim loopFlag As Boolean = False
For i As Integer = 0 To 150
  queryBuilder.Append("(" & i & ",'" & i & "th Value'),")
Next
If loopFlag Then
  ' call method to execute the query'
   ExecuteQuery(RemoveTrailingComma(queryBuilder.ToString()))
End If

在我的项目中，我们经常使用这些技术进行批量插入。有没有类似的批量更新方法？我引用了这些链接，但它们与我的场景不匹配

• linl1
• link2

Answer 1

答案就在引用链接本身中。再次仔细检查一遍，或者尝试以下操作:

  queryBuilder.Append("ON DUPLICATE KEY UPDATE col2 = VALUES(col2)")

因此您的整个代码将如下所示:

    Dim queryBuilder As New StringBuilder
    queryBuilder.Append("Insert into myTable(col1,col2)values")
    Dim loopFlag As Boolean = False
    For i As Integer = 0 To 150
        queryBuilder.Append("(" & i & ",'" & i & "th Value'),")
    Next
    Dim mySql As String = RemoveTrailingComma(queryBuilder.ToString()) & "ON DUPLICATE KEY UPDATE col2 = VALUES(col2)"
    If loopFlag Then
        ExecuteQuery(mySql)
    End If