如何在SQL命令中使用作用域标识符？

Question

我使用范围标识的概念如下。使用支持我的概念的范围标识的正确方法是什么？

对于单个数据：

Imports System.Data.SqlClient 

Public Class Class1 

    Sub Something() 

     Using con As SqlConnection = New SqlConnection("ConnnectionString") 
      Dim tran As SqlTransaction = con.BeginTransaction("ATransaction") 

      Using cmd As SqlCommand = New SqlCommand("DECLARE @ScopeId bigint;INSERT INTO AuditEvents(UserId) VALUES(@UserId);SELECT @ScopeId=SCOPE_IDENTITY();") 
       cmd.Parameters.AddWithValue("@UserId", 1) 
       cmd.Transaction = tran 

       For rowNumber As Integer = 0 To 5 'DataGridView.Rows.Count - 1 

       Next 

       Using childCommand As SqlCommand = New SqlCommand("INSERT INTO AuditEventDetails(EventId, ResourceName, OldValue, NewValue) SELECT @EventId, @ResourceName, @OldValue, @NewValue") 
        childCommand.Parameters.AddWithValue("@EventId", "@ScopeId") '??????? 
        childCommand.Parameters.AddWithValue("@ResourceName", "Something") 
        childCommand.Parameters.AddWithValue("@OldValue", "OldValue") 
        childCommand.Parameters.AddWithValue("@NewValue", "NewValue") 

        '............................................................................ 
        '............................................................................ 
        '............................................................................ 
        '............................................................................ 
       End Using 

      End Using 
     End Using 
    End Sub 

End Class 

对于多个数据：

Imports System.Data.SqlClient 

Public Class Class1 

    Sub Something() 

     Using con As SqlConnection = New SqlConnection("ConnnectionString") 
      Dim tran As SqlTransaction = con.BeginTransaction("ATransaction") 

      Using cmd As SqlCommand = New SqlCommand("DECLARE @ScopeId bigint;INSERT INTO AuditEvents(UserId) VALUES(@UserId);SELECT @ScopeId=SCOPE_IDENTITY();") 
       cmd.Parameters.AddWithValue("@UserId", 1) 
       cmd.Transaction = tran 

       For rowNumber As Integer = 0 To 5 'DataGridView.Rows.Count - 1 

       Using childCommand As SqlCommand = New SqlCommand("INSERT INTO AuditEventDetails(EventId, ResourceName, OldValue, NewValue) SELECT @EventId, @ResourceName, @OldValue, @NewValue") 
        childCommand.Parameters.AddWithValue("@EventId", "@ScopeId") '??????? 
        childCommand.Parameters.AddWithValue("@ResourceName", "Something") 
        childCommand.Parameters.AddWithValue("@OldValue", "OldValue") 
        childCommand.Parameters.AddWithValue("@NewValue", "NewValue") 

        '............................................................................ 
        '............................................................................ 
        '............................................................................ 
        '............................................................................ 
       Next 
       End Using 

      End Using 
     End Using 
    End Sub 

End Class 

Answer 1

如果使用存储的特效，那么我认为这是最好使用输出参数。

对于基于文本的SQL命令，我倾向于使用类似的;

public int InsertRecord(string ANumber, string Note) 
    { 
     string SQL_INSERT_RECORD = "INSERT INTO AnumberNotes (ANumber, Note) VALUES (@ANumber, @Note) ; SELECT CAST(scope_identity() AS int)"; 
     int NewId = -1; 
     try 
     { 
      using (IDbConnection conn = DBFactory.GetConnection()) 
      { 
       using (IDbCommand cmd = conn.CreateCommand()) 
       { 
        cmd.CommandText = SQL_INSERT_RECORD; 
        cmd.Parameters.Clear(); 
        IDbDataParameter param = cmd.CreateParameter(); 
        param.ParameterName = "@ANumber"; 
        param.Value = ANumber; 
        cmd.Parameters.Add(param); 

        param = cmd.CreateParameter(); 
        param.ParameterName = "@Note"; 
        param.Value = Note; 
        cmd.Parameters.Add(param); 

        NewId = (Int32) cmd.ExecuteScalar(); 
       } 
      } 
     } catch(Exception ex) { 
      throw new DAOException("AnumberNotesDAOBase.insertRecord: ", ex); 
     } 
     return NewId; 
    }