我正在制作一个小程序,员工可以在其中上下类。 员工有一个员工 ID,必须使用该 ID 才能上下类。
计时没问题,但我的问题是员工可以多次计时而不会超时。
我想做的是,每当员工计时时,他/她就不允许再次计时,除非他/她超时。
这是我到目前为止所做的事情:
private void TimeIN()
{
//check if Employee ID belongs to the tbl_humans table
Connection();
sql_connect.Close();
sql_connect.Open();
sql_command = new MySqlCommand("Select * from tbl_humans where ID = '" + textBox1.Text + "' ;", sql_connect);
sql_reader = sql_command.ExecuteReader();
string username;
//string password;
username = (textBox1.Text);
// password = (textBox2.Text);
int count = 0;
while (sql_reader.Read())
{
count = count + 1;
}
//checks if the Employee ID has been already timed in on tbl_loginout
// if it's already timed in, it will display "You time out first"
// but unfortunately, it's not working and still continues to time in the employee even if the employee is already timed in
if (count == 0)
{
try
{
Connection();
sql_connect.Close();
sql_connect.Open();
sql_command = new MySqlCommand
("Select * from tbl_loginout where ID = '" + textBox1.Text +
"' and timein_date = '" + DateTime.Today.ToString() + // checks if the employee is timed in on that day(today)
"' and timeout_time = '" + DateTime.Now.ToString("00:00:00") + // checks if the employee is still not time out
"';", sql_connect);
sql_reader = sql_command.ExecuteReader();
MessageBox.Show("You Time Out first");
}
catch (Exception aa)
{
MessageBox.Show(aa.Message);
}
}
如果有帮助,我们将不胜感激。谢谢!
最佳答案
尝试从查询中删除 "' 和 timeout_time = '"+ DateTime.Now.ToString("00:00:00") + "';"
或将其替换为 "' 且 timeout_time = null;"
。
一般来说,您应该手动编写想要使用的 SQL 并直接执行它,以确保它返回您想要的结果。
还有一点评论:您执行读取器sql_reader = sql_command.ExecuteReader();
并且不对结果执行任何操作,无论实际结果是什么,您都只是显示消息框。
关于c# - 检查时间(考勤 c#),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/34790613/