C# 插入到表中时数据类型不匹配
我在将数据插入名为C# 插入到表中时数据类型不匹配,c#,ms-access,visual-studio-2012,C#,Ms Access,Visual Studio 2012,我在将数据插入名为Order的Microsoft Access表时遇到一些问题。我列出的方法是在我的数据访问层中创建的,并通过演示层中的按钮单击事件调用。我得到的错误是: 条件表达式中的数据类型不匹配 错误突出显示在cmd.ExecuteNonQuery()行: 数据访问层方法: public static void processOrder(int employeeId, int tableId, DateTime orderDate, DateTime orderBegin, bool or
Order
的Microsoft Access表时遇到一些问题。我列出的方法是在我的数据访问层中创建的,并通过演示层中的按钮单击事件调用。我得到的错误是:
条件表达式中的数据类型不匹配
错误突出显示在cmd.ExecuteNonQuery()
行:
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()));
}
}
演示层按钮单击事件:
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
类对代码的修改:
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()));
}
}
publicstaticvoidprocessorder(int-employeeId、int-tableId、DateTime-orderDate、DateTime-orderBegin、bool-orderStatus)
{
尝试
{
if(KaiConnection.State==ConnectionState.Closed)
打开连接();
OleDbCommand cmd=新的OleDbCommand(“插入到[订单](员工ID、[TableID]、订单日期、订单开始、订单状态)”+
“值(@EmployeeID、@TableID、@OrderDate、@OrderBegin、@OrderStatus)”,连接);
OLEDB参数[]参数=新的OLEDB参数[5];
参数[0]=新的OLEDB参数(“@EmployeeID”,OleDbType.Integer);
参数[1]=新的OLEDB参数(“@TableID”,OleDbType.Integer);
参数[2]=新的OLEDB参数(“@OrderDate”,OleDbType.Date);
参数[3]=新的OLEDB参数(“@OrderBegin”,OleDbType.Date);
参数[4]=新的OLEDB参数(“@OrderStatus”,OleDbType.Boolean);
参数[0]。值=employeeId;
参数[1]。值=tableId;
参数[2]。值=订单日期;
参数[3]。值=orderBegin;
参数[4]。值=订单状态;
对于(int i=0;i<5;i++)
{
cmd.Parameters.Add(参数[i]);
}
cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
KaiConnection.Close();
}
捕获(例外情况除外)
{
Show((例如ToString());
}
}