[英]How to insert foreign key value in Child table in c#
我试图通过静态使用参数插入查询来填充子表中的外键值,我获得了成功,但是当我尝试动态地执行它时,它不起作用
我的父表是Customer
custId(pk),CustName,contact 是那里的字段
和子表是_order
orderId(pk),item,qauntity,cust_Id(fk) 是 filelds
我在 c# 中插入的代码是:
SqlCommand scmd = new SqlCommand("insert into Customer (custname,contact)values(@custname,@contact)", conn);
scmd.Parameters.AddWithValue("@custname", cusname.Text);
scmd.Parameters.AddWithValue("@contact", contact.Text);
scmd.ExecuteNonQuery();
SqlCommand scmd1 = new SqlCommand("insert into _order (item,qauntity,cust_Id) select @item,@qauntity,custId from Customer where custId= @custId", conn);
scmd1.Parameters.AddWithValue("@item", item.Text);
scmd1.Parameters.AddWithValue("@qauntity", qauntity.Text);
scmd1.ExecuteNonQuery();
当我在第二次查询中给出一个硬代码值时,它在什么条件下工作,但如何动态地做,我想每个人都理解我的问题,请帮助谢谢
尝试一下:
SqlCommand scmd = new SqlCommand("insert into Customer (custname,contact)values(@custname,@contact); SELECT SCOPE_IDENTITY()", conn);
scmd.Parameters.AddWithValue("@custname", cusname.Text);
scmd.Parameters.AddWithValue("@contact", contact.Text);
int custId = Convert.ToInt32(scmd.ExecuteScalar());
SqlCommand scmd1 = new SqlCommand("insert into _order (item,qauntity,cust_Id) VALUES(@item,@qauntity,@custId)", conn);
scmd1.Parameters.AddWithValue("@item", item.Text);
scmd1.Parameters.AddWithValue("@qauntity", qauntity.Text);
scmd1.Parameters.AddWithValue("@custId", custId);
scmd1.ExecuteNonQuery();
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