问题描述
目前,我正在使用 MVC 创建一个项目。现在我想在 INSERT 语句中插入一个身份 ID 值。
在我的控制器中:
string payment = @"INSERT INTO Payment(Payment_Method,Currency_Type,Total_Amount)
VALUES('{0}','{1}',{2})";
int pay = DBUtl.Execsql(payment,"Cash",currency,total);
if (pay == 1)
{
string pid = "SELECT TOP 1 Payment_id FROM Payment ORDER BY Payment_id DESC";
int paymentid = DBUtl.Execsql(pid);
if (cart.Count() != 0)
{
string order = @"INSERT INTO [Order](Order_Name,Order_Description,Order_Quantity,Payment_Id)
VALUES('{0}',{2},{3})";
现在,我想要已经插入到payment
表中的payment_id,这是第一个语句,并检索payment_id并将其用于Order
表的INSERT语句
我怎样才能做到这一点?
请帮忙
谢谢
解决方法
实际上,DBUtil
代码包括:
public static int ExecSQL(string sql,params object[] list)
{
List<String> escParams = new List<String>();
foreach (object o in list)
{
if (o == null)
escParams.Add("");
else
escParams.Add(EscQuote(o.ToString()));
}
DB_SQL = String.Format(sql,escParams.ToArray());
int rowsAffected = 0;
using (SqlConnection dbConn = new SqlConnection(DB_CONNECTION))
using (SqlCommand dbCmd = dbConn.CreateCommand())
{
try
{
dbConn.Open();
dbCmd.CommandText = DB_SQL;
rowsAffected = dbCmd.ExecuteNonQuery();
}
catch (System.Exception ex)
{
DB_Message = ex.Message;
rowsAffected = -1;
}
}
return rowsAffected;
}
如您所知,ExecuteNonQuery
表示影响行的数字
所以,您可以按如下所示进行:
对于 SQL SERVER 2005 及更高版本
using (SqlConnection con=new SqlConnection(@"Your connectionString"))
{
using(SqlCommand cmd=new SqlCommand("INSERT INTO Payment(Payment_Method,Currency_Type,Total_Amount) output INSERTED.Payment_id VALUES(@Payment_Method,@Currency_Type,@Total_Amount)",con))
{
cmd.Parameters.AddWithValue("@Payment_Method","Cash");
cmd.Parameters.AddWithValue("@Currency_Type",currency);
cmd.Parameters.AddWithValue("@Total_Amount",total);
con.Open();
int payment_id =Convert.ToInt32(cmd.ExecuteScalar());
if (con.State == System.Data.ConnectionState.Open)
con.Close();
return payment_id ;
}
}
此外,您可以将查询更改为:
"INSERT INTO Payment(Payment_Method,Total_Amount) VALUES(@Payment_Method,@Total_Amount)"; SELECT SCOPE_IDENTITY()"
,
现在,我尝试过这样的事情:
public IActionResult SaveDetail(List<Cart_Has_Services> cart,double total,string currency)
{
string payment = @"INSERT INTO Payment(Payment_Method,Total_Amount)
VALUES('{0}','{1}',{2});";
int pay = DBUtl.ExecSQL(payment,"Cash",currency,total);
if (pay == 1)
{
object pid = DBUtl.GetList("SELECT Payment_id FROM Payment");
int paymentid = Convert.ToInt32(pid);
if (cart.Count() != 0)
{
string order = @"INSERT INTO [Order](Order_Name,Order_Description,Order_Quantity,Payment_Id)
VALUES('{0}',{2},{3})";
foreach (var item in cart)
{
int ord = DBUtl.ExecSQL(order,item.Cart_Service,item.Additional_Notes,item.Quantity,paymentid);
就目前而言,代码将通过将值插入支付表来运行。之后,我想为我的下一个插入(即订单表)获取 payment_id。
我尝试获取 payment_id 的方法不起作用。