I am trying to do an insert using linq to sql but am getting the following error
Additional information: Cannot insert the value NULL into column 'UserID', table 'Itiss_Request.dbo.Users'; column does not allow nulls. INSERT fails.
The UserID table is the pk aswel as the identity has been set to autoincrement.
The database has 4 fields.
DataClasses1DataContext dt = new DataClasses1DataContext();
User usr = new User();
usr.MudID = a[1];
usr.Email = Session["email"].ToString();
usr.Name = Session["userName"].ToString();
dt.Users.InsertOnSubmit(usr);
dt.SubmitChanges();
This is an from my context file
[global::System.Data.Linq.Mapping.ColumnAttribute(Storage="_UserID", AutoSync=AutoSync.OnInsert, DbType="Int NOT NULL IDENTITY", IsPrimaryKey=true, IsDbGenerated=true)]
public int UserID
{
get
{
return this._UserID;
}
set
{
if ((this._UserID != value))
{
this.OnUserIDChanging(value);
this.SendPropertyChanging();
this._UserID = value;
this.SendPropertyChanged("UserID");
this.OnUserIDChanged();
}
}
}
Please try this...
DataClasses1DataContext dt = new DataClasses1DataContext();
User usr = new User();
usr.MudID = a[1];
usr.Email = Session["email"].ToString();
usr.Name = Session["userName"].ToString();
dt.Users.AddObject(usr);
dt.SaveChanges();
Related
Hello so i'm trying to code my own type of error catching on a sql statement. On my method add order i want to add some way of stopping someone from selling a product which has no stock. My code below does not yet do that. I can add orders and update the stock amount but i haven't figured out a way of adding an if statement that works.
#FXML
public void AddOrder(ActionEvent event) {
String orderID = orderBox.getText();
String customerID = customerBox.getText();
String productID = productBox.getText();
String amount = amountBox.getText();
// String cost = costBox.getText();
String date = dateBox.getText();
PreparedStatement sample;
dc = new Database();
try {
c = dc.Connect();
sample = c.prepareStatement("Select stockAmount from inventory WHERE productID = ?");
ResultSet rs = sample.executeQuery();
while (rs.next()) {
Integer amount2 = rs.getInt("Amount");
if (amount2 <= 0) {
System.out.println("No stock exists");
} else {
query = c.prepareStatement(
"INSERT INTO ordertable (orderID,customerID,productID,Amount,Date)VALUES(?,?,?,?,?)");
update = c.prepareStatement("UPDATE inventory set stockAmount = stockAmount-? WHERE productID =?");
update.setString(1, amount);
update.setString(2, productID);
update.execute();
query.setString(1, orderID);
query.setString(2, customerID);
query.setString(3, productID);
query.setString(4, amount);
// query.setString(5, cost);
query.setString(5, date);
query.executeUpdate();
// update.executeUpdate();
Alert confirmation = new Alert(Alert.AlertType.CONFIRMATION, "Saved");
// closeConfirmation.showMessageDialog(this, "Saved");
confirmation.show();
}
}
} catch (Exception e) {
e.printStackTrace();
}
orderBox.clear();
customerBox.clear();
productBox.clear();
amountBox.clear();
dateBox.clear();
loadDataFromDatabase(event);
}
Below is the error i'm getting
java.sql.SQLException: No value specified for parameter 1
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:964)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:897)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:886)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:860)
at
If you are just having trouble because of that exception, check these lines:
sample = c.prepareStatement("Select stockAmount from inventory WHERE productID = ?");
ResultSet rs = sample.executeQuery();
The query is defined to accept a parameter for productID, but you haven't given it a value prior to executing the statement. You'll need to change the query so that it doesn't require a parameter or assign a value to the parameter, like this:
sample = c.prepareStatement("Select stockAmount from inventory WHERE productID = ?");
sample.setString(1, productID);
ResultSet rs = sample.executeQuery();
I have a method that gets an existing row from a table in my database and updates some values on it and then save those changes. The table in quesiton has these columns:
The code that does the updating is here:
public void Update(Accommodation accommodation, string code, int supplierId)
{
var existingAccommodation = Get(a => a.Code == code && a.SupplierId == supplierId);
DateTime now = DateTime.Now;
existingAccommodation.ModifiedDate = now;
existingAccommodation.Description = accommodation.Description;
existingAccommodation.Introduction = accommodation.Introduction;
existingAccommodation.Name = accommodation.Name;
existingAccommodation.Strapline = accommodation.Strapline;
existingAccommodation.Type = accommodation.Type;
existingAccommodation.Processed = true;
DataContext.SaveChanges();
}
The problem is that the line DataContext.SaveChanges(); causes an exception whose innerexception says:
The conversion of a datetime2 data type to a datetime data type resulted in an out-of-range value
This is where the above code is called
Accommodation existingAccommodation = GetByCode(code, supplierId);
if (existingAccommodation != null)
{
_accommodationRepository.Update(
accommodation, code, existingAccommodation.SupplierId);
}
Below is my code using LINQ to SQL,on execution I get an error msg saying "Object reference not set to an instance of an object".I've joined 3 tables Users,UsersinRoles and Roles.Userinroles is the bridge table.I use join to retrive datas from 2 tables using bridge table i get the Object reference error.
public class Users : CollectionFactoryBase
{
public Users()
{
this.Summary = "Collection of Users";
}
public override Collection MakeCollection(CollectionRequestContext context)
{
UsersDataContext m_dataContext = new UsersDataContext();
const int maxItems_c = 150;
try
{
// string sessionvalue = HttpContext.Current.Session["SessionKey"] as string;
var Users = from p in m_dataContext.aspnet_Users
join t in m_dataContext.aspnet_UsersInRoles on
p.UserId equals t.UserId
join r in m_dataContext.aspnet_Roles on
t.RoleId equals r.RoleId
select new
{
UserName = p.UserName,
UserId = p.UserId,
RoleId = r.RoleId,
RoleName = r.RoleName,
userid = t.UserId,
roleid = t.RoleId
};
Collection collection = new Collection();
collection.Name = "Users";
foreach (var user in Users.Take(maxItems_c) )
{
collection.AddItem(user.UserName, user.RoleName, null, null, null, null, null);
}
return collection;
}
catch (Exception ex)
{
return ErrorCollection.FromException(ex);
}
}
}
}
Don't you think that last statement should be first one?
TSQL:-
Update table1
Set Name = 'John',
Address = null
where
ID = 1
LINQ-TO-SQL
var tab = db.Table1.Single(s => s.ID == 3);
tab.Name = DateTime.Now;
tab.Address = null;
db.SubmitChanges();
There isn't a single LINQ to SQL statement for updates. You have to retrieve the object, modify it, then save the changes (code assumes a single row since you have a specific Id):
var entity = context.Table1.Single(t => t.Id == 1);
entity.Name = "John";
entity.Address = "Toronto";
context.SubmitChanges();
using (var dataContext = new MyEntities())
{
var contact = Contacts.Single (c => c.ContactID == 1);
contact.FirstName = 'John';
contact.Address= 'Toronto';
dataContext.SaveChanges();
}
When I want to Insert data in my table this Exception appeared
The INSERT statement conflicted with the FOREIGN KEY constraint "FK_Message_Subject". The conflict occurred in database "C:\DOCUMENTS AND SETTINGS\TEHRANI\DESKTOP\MESSAGEADMINPAGE\APP_DATA\ASPNETDB.MDF", table "dbo.Subject", column 'ID_Subject'.
The statement has been terminated.
This Code for Insert :
string[] a = UserIDtxt.Text.Split(',');
foreach (String b in a)
{
Message M = new Message();
Guid i = (from q in MDB.aspnet_Memberships
where q.aspnet_User.UserName.ToString() == b.ToString()
select q).Single().UserId;
M.ID_Receiev = i;
M.ID_Message = Guid.NewGuid();
M.ID_Sender = (Guid)Admin.ProviderUserKey;
M.ID_Message_Parent = Guid.Empty;
if (SubjectDDL.SelectedItem.ToString() != "Other")
{
M.ID_Subject = new Guid(SubjectDDL.SelectedValue);
}
else
{
M.Other_Subject = Othertxt.Text;
}
M.Body = TEXTtxt.Text;
M.Date = DateTime.Now;
M.IsFinished = false;
M.IsRead = false;
MDB.Messages.InsertOnSubmit(M);
}
MDB.SubmitChanges();
you must set value all of feild
if (SubjectDDL.SelectedItem.ToString() != "Other")
{
M.ID_Subject = new Guid(SubjectDDL.SelectedValue);
M.Other_Subject = null;
}
else
{
M.ID_Subject = new Guid(SubjectDDL.SelectedValue);
M.Other_Subject = Othertxt.Text;
}
For what I can tell, based in the FOREIGN KEY constraint "FK_Message_Subject", you also have a table to Subjects. If this assumption is correct, when you assign M.ID_Subject a new Guid, it might not exist as a FOREIGN KEY in the Subjects table. You must find any existing Subject with the SubjectDDL.SelectedValue and retrieve the existing ID for the FOREIGN KEY. If it doesn't exist, create a new Subject and assign it directly to the Message M.
The same applies to when SubjectDDL.SelectedItem.ToString() == "Other". In this case, the FOREIGN KEY is null and it might be causing this error also.