复选框列表，如果 mysql 中的状态为真，则必须检查名称

Question

我有两列，一列是 checkStatus，另一列是 EmployeeName

我已经得到了所有的名字，但我不知道如何得到 checkStatus 如果状态为真则必须检查它，如果不是则不检查

        string Query = "Select Distinct EmployeeName  From tblschedule Where ScheduleFrom BETWEEN '"+clsSQLcon.DateFrom1+"' AND '"+ clsSQLcon.DateTo1 + "' "; ;
  
        using (MySqlCommand cmd  = new MySqlCommand(Query, conn))
        {
            try
            {
                conn.Open();
                
                using (MySqlDataReader myReader = cmd.ExecuteReader())
                {
                    while (myReader.Read())
                    {
                        string employeeName = (myReader.IsDBNull(myReader.GetOrdinal("EmployeeName")) ?
                                            string.Empty : myReader["EmployeeName"].ToString());
                        checkedListBox1.Items.Add(employeeName);
                    }

                }

            }

这是我获取名字的代码..

Answer 1

    string Query = "Select Distinct EmployeeName,checkStatus From tblschedule Where ScheduleFrom 
    BETWEEN '"+clsSQLcon.DateFrom1+"' AND '"+ clsSQLcon.DateTo1 + "' "; ;
  
        using (MySqlCommand cmd  = new MySqlCommand(Query, conn))
        {
            try
            {
                conn.Open();
                
                using (MySqlDataReader myReader = cmd.ExecuteReader())
                {
                    while (myReader.Read())
                    {
                        string employeeName = (myReader.IsDBNull(myReader.GetOrdinal("EmployeeName")) ?
                                            string.Empty : myReader["EmployeeName"].ToString());
    string checkStatus= (myReader.IsDBNull(myReader.GetOrdinal("checkStatus")) ?
                                            string.Empty : myReader["checkStatus"].ToString());
                        checkedListBox1.Items.Add(employeeName);
    if(checkStatus=="true")
      { checkedListBox1.SetItemChecked(checkedListBox1.Items.Count-1, true);   
}         
                    }

                }

            }

Answer 2

根据您的描述，您可以修改查询以包含状态吗？
您可能还应该参数化您的查询。
您的查询的外观示例：

       string Query = "SELECT EmployeeName, checkStatus FROM tblschedule WHERE ScheduleFrom BETWEEN @StartDate AND @EndDate ";

        using (MySqlCommand cmd = new MySqlCommand(Query, conn))
        {
            cmd.Parameters.AddWithValue("@StartDate", (MySqlDbType.DateTime)clsSQLcon.DateFrom1);
            cmd.Parameters.AddWithValue("@EndDate", (MySqlDbType.DateTime)clsSQLcon.DateTo1);
            conn.Open();
         try{
            using (MySqlDataReader myReader = cmd.ExecuteReader())
            {
                while (myReader.Read())
                {
                    string employeeName = myReader.IsDBNull(0) ? string.Empty : myReader.GetString(0);
                    bool cstatus = myReader.GetBoolean(1);
                    //do something with name and status and check distinct names in code instead
                }
            }
            }
          catch(MySqlException){//Exception handling}
        }

如果您只需要不同的名称，您可以在查询中添加“Group by (EmployeeName)”，但如果时间范围内有多个条目，您将随机获得一个。

Answer 3

@Jonjon Candare。你可以尝试参考我的代码。我在数据库中将 checkStatus 设置为 BIT 类型。在查询语句中加入checkStatus，读取数据时读取checkStatus。然后进行判断，设置checkedListBox1的SetItemChecked。

我的cs代码如下：

private void Form1_Load(object sender, EventArgs e)
        {
            string constr = @"Connstr";
            MySqlConnection con = new MySqlConnection(constr);
              string query = " Select Distinct EmployeeName,checkStatus From tblschedule Where ScheduleFrom BETWEEN '"+clsSQLcon.DateFrom1+"' AND '"+ clsSQLcon.DateTo1 + "' " ";
            con.Open();
            using (MySqlCommand cmd = new MySqlCommand(query, con))
            {
                try
                {
                    using (MySqlDataReader myReader = cmd.ExecuteReader())
                    {
                        while (myReader.Read())
                        {
                            string employeeName = (myReader.IsDBNull(myReader.GetOrdinal("EmployeeName")) ?
                                             string.Empty : myReader["EmployeeName"].ToString());
                            string checkStatus = (myReader.IsDBNull(myReader.GetOrdinal("checkStatus")) ?
                                            string.Empty : myReader["checkStatus"].ToString());
                            checkedListBox1.Items.Add(employeeName);
                            if (checkStatus == "True")
                            {
                                checkedListBox1.SetItemChecked(checkedListBox1.Items.Count - 1, true);
                            }
                            if (checkStatus == "False")
                            {
                                checkedListBox1.SetItemChecked(checkedListBox1.Items.Count - 1, false);
                            }
                        }
                    }
                }
                Catch(MySqlException)
                {
                }
            }
        }

结果如图：

复选框列表，如果 mysql 中的状态为真，则必须检查名称

Checkboxlist if status is true in mysql the name must be checked

c#

mysql

visual-studio

checklistbox