问题描述
我正在尝试以某种方式更新或重新检索 Access 数据库 (Random piece of data with column names) 中的数据
我正在使用 Microsoft.ACE.OLEDB.12.0
。
我创建了一个查询,该查询应该返回列具有两个日期之间的值的记录:
sql 示例:
SELECT Arkusz1.ID,Arkusz1.Adres,Arkusz1.Umówione,Arkusz1.Data_umówienia,Arkusz1.Zakończone,Arkusz1.[Spisano?],Arkusz1.Notatki
FROM Arkusz1
WHERE(
((Arkusz1.Umówione) = Yes) // or 1 or <> 0
AND ((Arkusz1.Zakończone) = No) // or 0 doesen't provide right answer
AND ((Arkusz1.Data_umówienia) BETWEEN 24/07/2021 AND 26/07/2021) )
ORDER BY Arkusz1.Data_umówienia;
我的代码:
void fillGrid()
{
string teraz = DateTime.Today.AddDays(-1).ToShortDateString().Replace('.','/');
string jutro = DateTime.Today.AddDays(1).ToShortDateString().Replace('.','/');
// AddDays +-1 because of my data issue,that's not important
string dzisiejsze = "SELECT Arkusz1.ID,"
+ " Arkusz1.Zakończone,Arkusz1.Notatki FROM Arkusz1"
+ " WHERE( ((Arkusz1.Umówione) = Yes) AND ((Arkusz1.Zakończone) = No) AND "
+ "((Arkusz1.Data_umówienia) BETWEEN "
+ teraz + " AND " + jutro + ") )"
+ " ORDER BY Arkusz1.Data_umówienia;";
//selecting almost every column from my only sheet (Arkusz1),//if Umówione (appointment is arranged) has True value AND issue is not ended (Zakończone)
//AND appointment date is between yesterday and tomorrow
//(as I said,that's all because my stupid ideas in creating DB)
connection.open();
OleDbDataAdapter dataAdapter = new OleDbDataAdapter(dzisiejsze,connection);
DataTable dt = new DataTable();
dataAdapter.Fill(dt);
TodaysPlan_dataGridView.DataSource = dt;
TodaysPlan_dataGridView.Refresh();
connection.Close();
}
我什至添加了一个特殊按钮来更新整个网格(首先它应该在第二个表单关闭后更新):
private void refreshGrid_Click(object sender,EventArgs e)
{
Application.DoEvents(); // because I saw something on stack,didn't work
fillGrid(); //start filling again,didn't work too
TodaysPlan_dataGridView.Refresh(); // same,didn't work
}
我没有收到任何错误,执行(即使在调试模式下)只是通过了 refreshGrid_Click
中的代码。
Edit: Tried to execute that SQL code for random data,didn't work too Ofc 这不是我问题中最重要的部分,但我可以另外问:)
我还将提供用于从第二个表单中保存按钮的代码,但在我看来它不会很有帮助:
private void save_button_Click(object sender,EventArgs e)
{
if ((Tick_label.Visible == true) && (IDInfo_label.Text == "All good!") && (street_textBox.TextLength > 0))
{
connection.open();
string cmd_string = "INSERT INTO Arkusz1 (ID,Adres,Przydzielenie) VALUES ('" + ID_maskedTextBox.Text + "','" + street_textBox.Text + "','" + startDate_dateTimePicker.Value + "')";
OleDbCommand command = new OleDbCommand(cmd_string,connection);
command.ExecuteNonQuery();
connection.Close();
this.DialogResult = DialogResult.OK;
this.Close();
}
else
{
MessageBox.Show("error");
}
}
这是我关于 Stack 的第一个问题,欢迎任何建议和建设性的批评!
顺便说一句,我正在使用 this YT 教程,希望它可以帮助某人 :)
解决方法
好吧,@Steve 和 @Jimi 提供的信息真的很有帮助,首先我使用 String.Format()
更改了字符串格式并解决了 SQL 问题 - 这是 (#date#) 格式:
DateTime tmp_teraz = DateTime.Today.AddDays(-1);
string teraz = String.Format("{0}/{1}/{2}",tmp_teraz.Month.ToString(),tmp_teraz.Day.ToString(),tmp_teraz.Year.ToString());
DateTime tmp_jutro = DateTime.Today.AddDays(1);
string jutro = String.Format("{0}/{1}/{2}",tmp_jutro.Month.ToString(),tmp_jutro.Day.ToString(),tmp_jutro.Year.ToString());
string dzisiejsze = String.Format("SELECT Arkusz1.ID,Arkusz1.Adres,Arkusz1.Umówione,Arkusz1.Data_umówienia,Arkusz1.Zakończone,Arkusz1.[Spisano?],Arkusz1.Notatki FROM Arkusz1 WHERE( ((Arkusz1.Umówione) = true) AND ((Arkusz1.Zakończone) = false) AND ((Arkusz1.Data_umówienia) " +
"BETWEEN (#{0}#) AND (#{1}#)) ) ORDER BY Arkusz1.Data_umówienia;",teraz,jutro);
最后,网格看起来像 this。
使用 dataGrid 刷新或插入数据不起作用,但我会随着时间的推移开发这一点。
感谢您的帮助,祝大家有个美好的一天!