Question

在SQL Server Management Studio中，当您执行SELECT查询时，您还会收到一条消息以及结果。我想在Rich Textbox中使用该消息。那可能吗？我正在谈论的消息是这样的：

到目前为止，我已经有了这段代码，它也用结果填充了组合框，但是我希望我的富文本框也显示该消息：

using (SqlConnection Con = new SqlConnection(Connectionstring.selectedBrugerString))
{
    Con.Open();
    SqlCommand cmd = new SqlCommand("SELECT USERNAME FROM PERSONAL", Con);
    SqlDataReader reader = cmd.ExecuteReader();
    while (reader.Read())
    {
        fromComboBox.Items.Add(reader[0]);
        toComboBox.Items.Add(reader[0]);
    }
    Con.Close();
}

GUI如下所示：

Answer 1

使用SqlConnection.InfoMessage事件

SQL Server返回警告或参考消息时，将发生此事件。

Answer 2

您无需查看消息。您可以像这样查看读者的RowsEffected：

using (SqlConnection Con = new SqlConnection(Connectionstring.selectedBrugerString))
{
    Con.Open();
    SqlCommand cmd = new SqlCommand("SELECT USERNAME FROM PERSONAL", Con);
    SqlDataReader reader = cmd.ExecuteReader();
    while (reader.Read())
    {
        fromComboBox.Items.Add(reader[0]);
        toComboBox.Items.Add(reader[0]);
    }
    var recordsEffected = reader.RecordsAffected;
}

Answer 3

this-返回受影响的行数。

SqlCommand comm;
// random code
int numberOfRecords = comm.ExecuteNonQuery();

编辑：

对于select查询，可以使用ExecuteScalar（）-

String sqlQuery = "SELECT count(USERNAME) FROM PERSONAL";
SqlCommand cmd = new SqlCommand(sqlQuery, conn);
try
{
    conn.Open();
    //Since return type is System.Object, a typecast is must
    count = (Int32)cmd.ExecuteScalar();
}

Answer 4

我全都工作了。感谢您的大力帮助。非常感激！我将展示所有这些，如果有的话可以使用它：D

结束于此：

using (SqlConnection Con = new SqlConnection(Connectionstring.selectedBrugerString))
        {
            Con.Open();
            SqlCommand cmd = new SqlCommand("SELECT USERNAME FROM PERSONAL", Con);
            using (SqlDataReader reader = cmd.ExecuteReader())
                {
                while (reader.Read())
                {
                    fromComboBox.Items.Add(reader[0]);
                    toComboBox.Items.Add(reader[0]);

                }
            }
            var countUsers = fromComboBox.Items.Count;
            movePostMessage.Text = countUsers + " brugere er fundet";
        }

    }

然后在按钮上单击我已完成的操作

using (SqlConnection Con = new SqlConnection(Connectionstring.selectedBrugerString))
        {
            Con.Open();
            string SQL1 = "UPDATE DEBSALDO SET PERSONALID = (SELECT PERSONALID FROM PERSONAL WHERE USERNAME = '" + toComboBox.Text + "') WHERE PERSONALID IN (SELECT PERSONALID FROM PERSONAL WHERE USERNAME = '" + fromComboBox.Text + "')";
            string SQL2 = "UPDATE SERVHEAD SET PERSONALID = (SELECT PERSONALID FROM PERSONAL WHERE USERNAME = '" + toComboBox.Text + "') WHERE PERSONALID IN (SELECT PERSONALID FROM PERSONAL WHERE USERNAME = '" + fromComboBox.Text + "')";
            string SQL3 = "UPDATE SERVICEB SET PERSONALID = (SELECT PERSONALID FROM PERSONAL WHERE USERNAME = '" + toComboBox.Text + "') WHERE PERSONALID IN (SELECT PERSONALID FROM PERSONAL WHERE USERNAME = '" + fromComboBox.Text + "')";
            string SQL4 = "UPDATE PERSONAL SET ACOUNTCYID = NULL WHERE PERSONALID IN (SELECT PERSONALID FROM PERSONAL WHERE USERNAME = '" + fromComboBox.Text + "')";
            SqlCommand cmd1 = new SqlCommand(SQL1, Con);
            SqlCommand cmd2 = new SqlCommand(SQL2, Con);
            SqlCommand cmd3 = new SqlCommand(SQL3, Con);
            SqlCommand cmd4 = new SqlCommand(SQL4, Con);
            Int32 rowsAffectedOnUpdate1 = cmd1.ExecuteNonQuery();
            Int32 rowsAffectedOnUpdate2 = cmd2.ExecuteNonQuery();
            Int32 rowsAffectedOnUpdate3 = cmd3.ExecuteNonQuery();
            Int32 rowsAffectedOnUpdate4 = cmd4.ExecuteNonQuery();
            movePostMessage.Text = rowsAffectedOnUpdate1 + " regninger flyttet fra tidligere brugers debitor saldo \r\n" + rowsAffectedOnUpdate2 + " regninger flyttet med tidligere bruger som ejer \r\n" + rowsAffectedOnUpdate3 + " ydelser flyttet med tidligere bruger som ejer \r\n" + rowsAffectedOnUpdate4 + " kontoplan nulstillet";
        }

以及它的GUI：

如何从SQL查询将消息获取到C＃中的富文本框中

4 个答案: