防止重叠约会 C# MySQL

Question

不确定我如何才能做到这一点，所以当单击按钮以保存/预订约会时，它将检查现有约会并且不允许约会重叠。这是目前的代码。

private void button1_Click(object sender, EventArgs e)
        {
            SqlConnection con = new SqlConnection(@"Data Source=DESKTOP-ELTMMCE;Initial Catalog=Stylogistx;Integrated Security=True");
            DateTime dt = DateTime.ParseExact(dateTbx.Text, "M/d/yyyy", CultureInfo.InvariantCulture);
            
            if (dt < DateTime.Today)
            {
                MessageBox.Show("Appointment Date is in the past. Please select current or future date.");
            }
            else
            {
              
                try
                {
                    con.Open();
                    SqlCommand cmd = new SqlCommand("INSERT INTO APPOINTMENT(APP_DATE, APP_STARTTIME, APP_ENDTIME, CLIENT_ID, EMP_ID, SERVICE_ID, APP_STATUS) values ('" + dateTbx.Text + "','" + apptStartTimePicker.Value.ToString("hh:mm tt") + "','" + apptEndTimePicker.Value.ToString("hh:mm tt") + "','" + clientCmboBx.SelectedValue.ToString() + "','" + stylistCmboBx.SelectedValue.ToString() + "','" + serviceCmboBx.SelectedValue.ToString() + "','" + "BOOKED" + "')", con);
                    cmd.ExecuteNonQuery();
                    MessageBox.Show("Appointment Booked");

                    DialogResult dialogResult = MessageBox.Show("Track Inventory?", "Would you like to track any inventory for this appointment?", MessageBoxButtons.YesNo);
                    if (dialogResult == DialogResult.Yes)
                    {
                        this.Hide();
                        Inventory_Tracking invt = new Inventory_Tracking();
                        invt.Show();
                    }
                    else if (dialogResult == DialogResult.No)
                    {
                        this.Hide();
                        Appointment_Management am = new Appointment_Management();
                        am.Show();
                    }
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }
            con.Close();
            this.Hide();

我尝试创建一个查询，选择 APP_STATUS = 'BOOKED' 的约会，这将引入 APP_STARTTIME 和 APP_ENDTIME。

我不确定检查现有开始和结束时间的方法，如果尝试在另一个约会已预订的时间段内进行约会，则推送无效消息。

我还是 C#/Java 的新手，我卡住了，不知道该怎么做。

Answer 1

    I have written some code for you. Try to do the following. -
    1- Create a class model
    2- Serializer class model to XML
    3- Do implementation in your DAL and BAL layers
    4- Create a procedure 
    
    Some code samples:
        public class AppointmentDetails
        {
            public int appDate { get; set; }
            public string appStartTime { get; set; }
            public string appEndTime { get; set; }
            public int clientId { get; set; }
            public int empId { get; set; }
            public int serviceId { get; set; }
            public string appStatus { get; set; }
        }
    
    public void BookAppointmentDetails(AppointmentDetails appointmentDetails)
            {
                string xmlAppointmentDetails = string.Empty;
                //Serializer model to XML
                XmlSerializer mfaAuditSerializer = new XmlSerializer(typeof(AppointmentDetails));
                using (StringWriter textWriter = new StringWriter())
                {
                    mfaAuditSerializer.Serialize(textWriter, appointmentDetails);
                    xmlAppointmentDetails = textWriter.ToString();
                }
    
                using (SqlConnection conn = new SqlConnection("<<DefineConnection>>"))
                {
                    using (SqlCommand cmd = new SqlCommand("dbo.uspBookNewAppointmentDetails", conn))
                    {
                        cmd.CommandType = CommandType.StoredProcedure;
    
                        // set up the parameters
                        cmd.Parameters.Add("@prmAppointmentDetails", SqlDbType.Xml).Value = xmlAppointmentDetails;
                        cmd.Parameters.Add("@prmOutput", SqlDbType.NVarChar, 20).Direction = ParameterDirection.Output;
    
    
                        // open connection and execute stored procedure
                        conn.Open();
                        cmd.ExecuteNonQuery();
    
                        // read output value from @prmOutput
                        string output = Convert.ToString(cmd.Parameters["@prmOutput"].Value);
                        conn.Close();
                    }
                }
            }
    
Create a table and stored the procedure in SQL Server Database
CREATE TABLE AppointmentDetails(
AppId BIGINT IDENTITY(1,1) PRIMARY KEY,
APP_DATE DATE NULL,
APP_STARTTIME NVARCHAR(12) NULL,
APP_ENDTIME NVARCHAR(12) NULL,
CLIENT_ID INT NULL,
EMP_ID INT NULL,
SERVICE_ID INT NULL,
APP_STATUS NVARCHAR(20) NULL
)
    IF EXISTS (SELECT 1 FROM SYS.PROCEDURES WHERE Name = 'uspBookNewAppointmentDetails')
    BEGIN
        DROP PROC dbo.uspBookNewAppointmentDetails
    END
    GO
    CREATE PROCEDURE [dbo].[uspBookNewAppointmentDetails]
    @prmAppointmentDetails XML,
    @prmOutput      [NVARCHAR](20) OUTPUT
    AS
    BEGIN
     SET NOCOUNT ON;
     BEGIN TRANSACTION [Tran1]
     BEGIN TRY  
        INSERT INTO AppointmentDetails(APP_DATE,APP_STARTTIME,APP_ENDTIME,CLIENT_ID,EMP_ID,SERVICE_ID,APP_STATUS)
        SELECT
            data.col.value('(appDate)[1]', 'DATE'),
            data.col.value('(appStartTime)[1]', 'NVARCHAR(12)'),
            data.col.value('(appEndTime)[1]', 'NVARCHAR(12)'),
            data.col.value('(clientId)[1]', 'INT'),
            data.col.value('(empId)[1]', 'INT'),
            data.col.value('(serviceId)[1]', 'INT'),
            data.col.value('(appStatus)[1]', 'NVARCHAR(20)')
        FROM @prmAppointmentDetails.nodes('/BookAppointment') as data(col)
        IF(@@ROWCOUNT > 0)
        BEGIN
            SET @prmOutput='BOOKED';
        END
      COMMIT TRANSACTION [Tran1]
     END TRY      
     BEGIN CATCH      
      ROLLBACK TRANSACTION [Tran1]      
      DECLARE @ErrorMessage NVARCHAR(MAX), @ProcessName NVARCHAR(MAX), @ErrorSeverity NVARCHAR(MAX)
      SET @ErrorMessage = ERROR_MESSAGE()
      SET @ProcessName = ERROR_PROCEDURE()
      SET @ErrorSeverity = ERROR_SEVERITY()
      SET @prmOutput=@ErrorMessage;
      RAISERROR(@ErrorMessage,@ProcessName,@ErrorSeverity)
     END CATCH 
    END