C# SQLCommand - 参数化查询被缩短

Question

抱歉格式有点粗糙

我在 C# 中通过 SQLCommand 插入语句时遇到问题。插入完成后，ID 将返回给程序。

我填充了一些变量并编写了一个 SQLCommand。所有的参数都考虑到了。

using (SqlCommand sqlCatCmd = new SqlCommand())
{
   sqlCatCmd.CommandText = 
       "INSERT INTO [ChargeType](IsRecurring, IsApplied4NewMembers, Name, PurseID, AllowFamilyDiscount) " +
       "Values (@IsRec, @NewMem, @CName, @PurseID, @FamDisc);" +
       "SET @ChrgID = SCOPE_IDENTITY();";

  //Connections are opened further up the code no need to include
  sqlCatCmd.Connection = _importSettings.sqlServerConnection;
  sqlCatCmd.Transaction = _importSettings.sqlServerTransaction;

  //Parameters
  sqlCatCmd.Parameters.AddWithValue("@IsRec", _reapply);
  sqlCatCmd.Parameters.AddWithValue("@NewMem", _onNewMem);
  sqlCatCmd.Parameters.AddWithValue("@CName", _name);
  sqlCatCmd.Parameters.AddWithValue("@PurseID", _purse);
  sqlCatCmd.Parameters.AddWithValue("@FamDisc", _applyFamDisc);

  //Create parameter for newly added chargeType id value
  SqlParameter ChrgTypeIDReturn = new SqlParameter();
  ChrgTypeIDReturn.ParameterName = "@ChrgID";
  ChrgTypeIDReturn.Size = 4;
  ChrgTypeIDReturn.Direction = ParameterDirection.Output;
  sqlCatCmd.Parameters.Add(ChrgTypeIDReturn);

  //execute
  sqlCatCmd.ExecuteNonQuery();

 //update variable with returned id value
 _chrgTypeReturnedId = Convert.ToInt32(ChrgTypeIDReturn.Value);
 _importSettings.sqlServerTransaction.Commit();
 conn.CloseSqlConnection(_importSettings.sqlServerConnection);
}

当我执行查询时，捕获到以下内容：

The parameterized query '(@IsRec nvarchar(1),@NewMem nvarchar(1),@CName nvarchar(25),@Pur' expects the parameter '@PurseID', which was not supplied.

它似乎缩短了查询，我在这里缺少限制吗？查看我的字符串，它在语法上似乎是正确的

谢谢

Answer 1

我认为它不会削减查询，因为它在异常消息的后面提到了完整的参数名称 @PurseID。

检查是否 _purse == null 有机会。如果是这样，您必须改用 DBNull.Value。

Answer 2

你可以重写SQL语句来输出insert id。像： INSERT INTO table1 (name) OUTPUT Inserted.ID VALUES('FooBar')

然后使用 ExecuteScalar() 而不是 ExecuteNonQuery()。重写：

using (SqlCommand sqlCatCmd = new SqlCommand())
{
   sqlCatCmd.CommandText = 
       "INSERT INTO [ChargeType](IsRecurring, IsApplied4NewMembers, Name, PurseID, AllowFamilyDiscount) " +
       "OUTPUT Inserted.ID " +
       "Values (@IsRec, @NewMem, @CName, @PurseID, @FamDisc)";

  //Connections are opened further up the code no need to include
  sqlCatCmd.Connection = _importSettings.sqlServerConnection;
  sqlCatCmd.Transaction = _importSettings.sqlServerTransaction;

  //Parameters
  sqlCatCmd.Parameters.AddWithValue("@IsRec", _reapply);
  sqlCatCmd.Parameters.AddWithValue("@NewMem", _onNewMem);
  sqlCatCmd.Parameters.AddWithValue("@CName", _name);
  sqlCatCmd.Parameters.AddWithValue("@PurseID", _purse);
  sqlCatCmd.Parameters.AddWithValue("@FamDisc", _applyFamDisc);

  //ExecuteScalar to get OUTPUT value from Sql string
  int insertedId = sqlCatCmd.ExecuteScalar() as int;

 //update variable with returned id value
 _chrgTypeReturnedId = insertedId;
 _importSettings.sqlServerTransaction.Commit();
 conn.CloseSqlConnection(_importSettings.sqlServerConnection);
}

C# SQLCommand - 参数化查询被缩短

C# SQLCommand - Parametrized query is cut short

c#

sqlcommand

sql-server-2012