插入表时数据类型不匹配
本文关键字:不匹配 数据类型 插入 | 更新日期: 2023-09-27 18:14:56
我有一些问题插入数据到一个名为Order
的Microsoft Access表。我列出的方法是在数据访问层中创建的,并通过表示层中的Button Click事件调用。我得到的错误是:
标准表达式中的数据类型不匹配。
错误在cmd.ExecuteNonQuery()
行突出显示:
数据访问层方法:
public static void processOrder(int employeeId, int tableId, DateTime orderDate, DateTime orderBegin, bool orderStatus)
{
try
{
if (KaiConnection.State == ConnectionState.Closed)
KaiConnection.Open();
OleDbCommand cmd = new OleDbCommand(
"INSERT INTO [Order] (EmployeeID, [TableID], OrderDate, OrderBegin, OrderStatus)" +
" VALUES (?,?,?,?,?)", KaiConnection);
//cmd.CommandText = sSQLCommand;
cmd.Parameters.AddWithValue("?", employeeId);
cmd.Parameters.AddWithValue("?", tableId);
cmd.Parameters.AddWithValue("?", orderDate);
cmd.Parameters.AddWithValue("?", orderBegin);
cmd.Parameters.AddWithValue("?", orderStatus);
// Execute the SQL command
cmd.ExecuteNonQuery();
KaiConnection.Close();
}
catch (Exception ex)
{
MessageBox.Show((ex.ToString()));
}
}
表示层按钮点击事件:
private void btnProcessOrder_Click(object sender, EventArgs e)
{
Order anOrder = new Order();
anOrder.EmployeeId = empId;
anOrder.TableId = int.Parse(txtTableID.Text);
anOrder.OrderDate = DateTime.Today;
anOrder.OrderBegin = DateTime.Now;
anOrder.OrderStatus = true;
anOrder.processOrder();
}
下面是使用OleDbParameter
类修改的代码:
public static void processOrder(int employeeId, int tableId, DateTime orderDate, DateTime orderBegin, bool orderStatus)
{
try
{
if (KaiConnection.State == ConnectionState.Closed)
KaiConnection.Open();
OleDbCommand cmd = new OleDbCommand("INSERT INTO [Order] (EmployeeID, [TableID], OrderDate, OrderBegin, OrderStatus)" +
" VALUES (@EmployeeID, @TableID, @OrderDate, @OrderBegin, @OrderStatus)", KaiConnection);
OleDbParameter[] parameters = new OleDbParameter[5];
parameters[0] = new OleDbParameter("@EmployeeID", OleDbType.Integer);
parameters[1] = new OleDbParameter("@TableID", OleDbType.Integer);
parameters[2] = new OleDbParameter("@OrderDate", OleDbType.Date);
parameters[3] = new OleDbParameter("@OrderBegin", OleDbType.Date);
parameters[4] = new OleDbParameter("@OrderStatus", OleDbType.Boolean);
parameters[0].Value = employeeId;
parameters[1].Value = tableId;
parameters[2].Value = orderDate;
parameters[3].Value = orderBegin;
parameters[4].Value = orderStatus;
for (int i = 0; i < 5; i++)
{
cmd.Parameters.Add(parameters[i]);
}
cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
KaiConnection.Close();
}
catch (Exception ex)
{
MessageBox.Show((ex.ToString()));
}
}