删除所选记录,但不删除当前记录。 c#
问题描述:
private void button4_Click(object sender, EventArgs e)
{
myConn.Open();
string query = "Delete * from tbl_attendance where [attendance_id] =" + textBox1.Text + "";
OleDbCommand cmd = new OleDbCommand();
string message = "Are you sure you want to delete this data?";
string caption = "Delete";
var result = MessageBox.Show(message, caption, MessageBoxButtons.OKCancel, MessageBoxIcon.Exclamation);
if (result == DialogResult.OK)
{
cmd.Connection = myConn;
cmd.CommandText = query;
cmd.ExecuteNonQuery();
MessageBox.Show("Successfully deleted recorded data");
button4.Visible = false;
button2.Visible = true;
label5.Visible = false;
textBox1.Visible = false;
textBox1.Text = "";
myConn.Close();
try
{
myConn.Open();
OleDbCommand cmd2 = new OleDbCommand();
cmd2.Connection = myConn;
string query2 = "Select attendance_id as [ID], username as [Username], time_in as [Time In],time_out as [Time Out] from tbl_attendance";
cmd.CommandText = query2;
OleDbDataAdapter da = new OleDbDataAdapter(cmd);
DataTable dt = new DataTable();
da.Fill(dt);
dataGridView1.DataSource = dt;
myConn.Close();
}
catch (Exception ex)
{
MessageBox.Show("Error " + ex);
}
myConn.Close();
}
else
{
this.DialogResult = DialogResult.Cancel;
button4.Visible = false;
button2.Visible = true;
label5.Visible = false;
textBox1.Visible = false;
textBox1.Text = "";
}
myConn.Close();
}
我不确定在哪里插入语句,最后插入的数据可能不会被删除。就像,我的datagridview中的任何选定记录都可以删除,但不是当前记录,因为它是记录中的最新时间。请帮助。谢谢。删除所选记录,但不删除当前记录。 c#
答
注意事项:
没有你的数据库我不能测试这个
你的代码是不是结构良好的,我不会试图纠正你使用的上网本
。 BAD
我只是打算写的选择等不完整的代码
1:选择该行,您要删除
string id = textBox1.Text;
deleterow = "Select * from tbl_attendance where id=" + id;
2:获得最大时间为上删除用户排
maxtime = "select max(timein) from tbl_attendance where username='" + deleterow["username"] + "'";
3:获取用户和最大时间行(或列)在
lastrows = "select * from tbl_attendance where username='" + deleterow["username" + "' and timein='" + maxtimein + "'";
4:比较与一个最后的行ID你tryign删除
if (lastrows["id] == id)
{
//dont delete!
}
+0
明白了,谢谢 – Niden 2015-03-13 13:29:16
你为什么要打开和关闭连接这么多? – juharr 2015-03-13 12:53:29
仍然确保一切都运行良好,编程新手。抱歉。 – Niden 2015-03-13 12:57:51
@juharr是对的,我建议你打开cmd.CommandText = query后的连接。然后最后使用该子句并在那里使用myConn.Close(); – Veelicus 2015-03-13 12:58:55