这是我第一次使用 SQL Server。我已将 Access DB 导出到 SQL Server,并希望在我的应用程序中使用它。我已将新的 SQL DB 添加到我的 C# 项目并替换OleDB
为Sql
. 我现在无法执行与 Access 中的本地数据库完美配合的查询。
询问:
string query = @"SELECT SessionID, SemesterA, SemesterB, RoomID, SessionDate, SessionTimeStart, SessionTimeEnd" +
" FROM [Session] " +
" WHERE RoomID = @RoomID " +
" AND SessionDate = getdate() ";
我已按照 VS 错误的指示替换Date()
为getdate()
,但查询不会产生任何结果(应该返回一条记录,Access DB 会)
我的 RoomSelect 表单代码:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace AutoReg
{
public partial class RoomSelect : Form
{
DataTable queryResult = new DataTable();
public string RoomID;
RoomActiveSession RoomActiveSessionForm = new RoomActiveSession();
public RoomSelect()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
switch (listBox1.SelectedItem.ToString())
{
case "MB0302":
RoomID = listBox1.SelectedItem.ToString();
roomQuery();
break;
case "MC1001":
RoomID = listBox1.SelectedItem.ToString();
roomQuery();
break;
case "MC3203":
RoomID = listBox1.SelectedItem.ToString();
roomQuery();
break;
case "MC3204":
RoomID = listBox1.SelectedItem.ToString();
roomQuery();
break;
}
}
public void roomQuery()
{
string ConnStr = "Data Source=DUZY;Initial Catalog=AutoRegSQL;Integrated Security=True";
SqlConnection MyConn = new SqlConnection(ConnStr);
MyConn.Open();
//SQL query that todays sessions for the given roomID
string query = @"SELECT SessionID, SemesterA, SemesterB, RoomID, SessionDate, SessionTimeStart, SessionTimeEnd" +
" FROM [Session] " +
" WHERE RoomID = @RoomID " +
" AND SessionDate = getdate() ";
SqlCommand command = new SqlCommand(query, MyConn);
command.Parameters.Add("RoomID", SqlDbType.Char).Value = RoomID;
SqlDataAdapter adapter = new SqlDataAdapter(command);
adapter.Fill(queryResult);
if (queryResult.Rows.Count == 0)
{
MessageBox.Show("No active sessions today for the given room number");
MyConn.Close();
}
else
{
RoomActiveSessionForm.SetDataSouce(queryResult);
this.Hide();
RoomActiveSessionForm.ShowDialog();
MyConn.Close();
}
}
}
}
当我运行程序时,我收到一条消息“给定房间号今天没有活动会话”,当查询没有结果时应该执行该消息,但我知道一个事实,它应该返回一条记录)