我想从accessDatabase中写入特定的单元格数据到数据表中。我使用SELECT查询来获取这些数据,但是当将数据写入数据表中的特定单元格时,循环在迭代之前会中断一次,即使它应该迭代两次。为什么我的代码在数据表中填充单元时停止?
下面是我使用的代码:
DataTable dt = new DataTable(); // Creates Table
dt.Clear();
dt.Columns.Add("Hol/Abs", typeof(string)); // Column 0
dt.Columns.Add("FirstDay", typeof(DateTime)); // Column 1
dt.Columns.Add("LastDay", typeof(DateTime)); // Column 2
dt.Columns.Add("TotalDays", typeof(int)); // Column 3
dt.Columns.Add("Reason", typeof(string)); // Column 4
LblName.Text = PassName; //Loads Name
string ConnString = @"Provider = Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\\HoliPlanData.accdb;Persist Security Info=False";
string Query = "SELECT PayrollNo FROM [Employee] WHERE (FirstName + ' ' + LastName) = @Name";
string CountQuery = "SELECT COUNT(*) FROM [Holiday]";
string GetStartQuery = "SELECT StartDate FROM [Holiday] WHERE PayrollNo = @PayrollNo";
string GetEndQuery = "SELECT EndDate FROM [Holiday] WHERE PayrollNo = @PayrollNo";
string GetReasonQuery = "SELECT Reason FROM [Holiday] WHERE PayrollNo = @PayrollNo";
using (OleDbConnection conn = new OleDbConnection(ConnString))
using (OleDbCommand GetPayroll = new OleDbCommand(Query, conn))
{
conn.Open();
GetPayroll.Parameters.Add("@Name", OleDbType.VarChar).Value = LblName.Text;
int GotPayroll = Convert.ToInt32(GetPayroll.ExecuteScalar()); //Uses Query to Get PayrollNo
OleDbCommand CountRowsInHol = new OleDbCommand(CountQuery, conn);
CountRowsInHol.Parameters.AddWithValue("@PayrollNo", OleDbType.Integer).Value = GotPayroll;
int HolidayCount = (int) (CountRowsInHol.ExecuteScalar()); //Uses CountQuery to Get HowMany lines are in [Holiday]
int LoopCount = 0;
while (LoopCount <= HolidayCount) //Will go though all Lines in [Holiday]
{
OleDbCommand GetStart = new OleDbCommand(GetStartQuery, conn);
OleDbCommand GetEnd = new OleDbCommand(GetEndQuery, conn);
OleDbCommand GetReason = new OleDbCommand(GetReasonQuery, conn);
GetStart.Parameters.Add("@PayrollNo", OleDbType.Integer).Value = GotPayroll;
GetEnd.Parameters.Add("@PayrollNo", OleDbType.Integer).Value = GotPayroll;
GetReason.Parameters.Add("@PayrollNo", OleDbType.Integer).Value = GotPayroll;
DateTime StartHold = Convert.ToDateTime(GetStart.ExecuteScalar());
DateTime EndHold = Convert.ToDateTime(GetEnd.ExecuteScalar());
string ReasonHold = (GetReason.ExecuteScalar()).ToString();
dt.Rows[LoopCount]["FirstDay"] = StartHold;
dt.Rows[LoopCount]["LastDay"] = EndHold;
dt.Rows[LoopCount]["Reason"] = ReasonHold;
LoopCount = LoopCount + 1;
}
}
我知道它的长,但它是非常基本的。代码中断..
dt.Rows [LoopCount] [“FirstDay”] = StartHold;
..不写入数据表。 任何帮助或建议将不胜感激,也很开放,以更好地更好地格式化我的代码的建议,所以它更容易阅读和更普遍的标准。
我没有看到你曾经填充数据表行。一个好的做法是将代码封装在Try/Catch中,并阅读异常消息。 – Crowcoder