C＃数据库插入（ASP.NET） – ExecuteNonQuery：CommandText属性尚未初始化

我第一次从ASP.NET / C＃进行插入，我遇到了一些问题。 每次运行此代码时，我都会收到以下错误：“ExecuteNonQuery：CommandText属性尚未初始化”有谁知道这意味着什么以及我如何修复它？

提前致谢！

string sqlQuery = "INSERT INTO ATI_LOG_IO (Date, Connect_Time, Disconnect_Time, ATI_Rep, Reason_For_Access, Property_Contact, Case_Number, Comments, Property_ID)"; sqlQuery += "VALUES (@Today, @Connect, @Disconnect, @Rep, @Reason, @Contact, @CaseNum, @Comments, @PropertyID)"; using (SqlConnection dataConnection = new SqlConnection(connectionString)) { using (SqlCommand dataCommand = dataConnection.CreateCommand()) { dataConnection.Open(); dataCommand.CommandType = CommandType.Text; dataCommand.CommandText = sqlQuery; dataCommand.Parameters.Add("@Today", DateTime.Today.ToString()); dataCommand.Parameters.Add("@Connect", txtInDate.Text + " " + fromHrs.Text + ":" + fromMins.Text + ":00"); dataCommand.Parameters.Add("@Disconnect", txtOutdate.Text + " " + toHrs.Text + ":" + fromMins.Text + ":00"); dataCommand.Parameters.Add("@Rep", repID); dataCommand.Parameters.Add("@Reason", txtReason.Text); dataCommand.Parameters.Add("@Contact", txtContact.Text); dataCommand.Parameters.Add("@CaseNum", txtCaseNum.Text); dataCommand.Parameters.Add("@Comments", txtComments.Text); dataCommand.Parameters.Add("@PropertyID", lstProperties.SelectedValue); dataCommand.ExecuteNonQuery(); dataConnection.Close(); } } 

Answer 1

 string sqlQuery = "INSERT INTO ATI_LOG_IO (Date, Connect_Time, Disconnect_Time, ATI_Rep, Reason_For_Access, Property_Contact, Case_Number, Comments, Property_ID)"; sqlQuery += " VALUES (@Today, @Connect, @Disconnect, @Rep, @Reason, @Contact, @CaseNum, @Comments, @PropertyID)"; using (SqlConnection dataConnection = new SqlConnection(connectionString)) { using (SqlCommand dataCommand = new SqlCommand(sqlQuery, dataConnection)) { dataCommand.Parameters.AddWithValue("Today", DateTime.Today.ToString()); dataCommand.Parameters.AddWithValue("Connect", txtInDate.Text + " " + fromHrs.Text + ":" + fromMins.Text + ":00"); dataCommand.Parameters.AddWithValue("Disconnect", txtOutdate.Text + " " + toHrs.Text + ":" + fromMins.Text + ":00"); dataCommand.Parameters.AddWithValue("Rep", repID); dataCommand.Parameters.AddWithValue("Reason", txtReason.Text); dataCommand.Parameters.AddWithValue("Contact", txtContact.Text); dataCommand.Parameters.AddWithValue("CaseNum", txtCaseNum.Text); dataCommand.Parameters.AddWithValue("Comments", txtComments.Text); dataCommand.Parameters.AddWithValue("PropertyID", lstProperties.SelectedValue); dataConnection.Open(); dataCommand.ExecuteNonQuery(); dataConnection.Close(); } } 

复制粘贴应该可以解决问题

Answer 2

这通常意味着您没有设置CommandText属性，但在您的情况下，您有。

您应该尝试在此行测试sqlQuery字符串实际上不为空：

 dataCommand.CommandText = sqlQuery; 

PS作为“最佳实践”，您可能需要考虑在设置SqlCommand对象后打开连接，以最大限度地减少打开连接所花费的时间：

  dataCommand.CommandType = CommandType.Text; dataCommand.CommandText = sqlQuery; dataCommand.Parameters.Add("@Today", DateTime.Today.ToString()); //... dataConnection.Open(); dataCommand.ExecuteNonQuery(); dataConnection.Close(); 

Answer 3

查看字符串sql查询，您不会在“INTO”部分和“VALUES”部分之间留下空格。

 ...............Property_ID)"; sqlQuery += "VALUES (@Today, .............. 

应该：

 ...............Property_ID)"; sqlQuery += " VALUES (@Today, ..............