I'm using an Oracle 11g database with the ADO.NET Entity Data Model. Every now and then I run into this error and I have no idea what's causing it. I'm assuming it's something in the EDMX file or the designer file for it but I can't seem to figure it out. I've deleted the model, added it, updated, etc multiple times and can't figure out the issue. It works on other pages but this one seems to be a problem.
This has happened before, but simply removing and re-adding the table worked. Any ideas on how to fix this?
using (ODSData.Entities entities = new Entities())
{
var info = from item in entities.ODS_VALIDATIONRULE
select item;
newPK = Convert.ToInt32(info.Max(p => p.VALIDATIONRULEID)) + 1;
try
{
ODS_VALIDATIONRULE newRule = new ODS_VALIDATIONRULE();
newRule.ALLOWNULLIND = isNull;
newRule.CREATEDATE = DateTime.Now;
newRule.FAILIND = isFail;
newRule.MAXVALUEFACTOR = max;
newRule.MINVALUEFACTOR = min;
newRule.RULEDESCRIPTION = description;
newRule.SOURCESYSTEM = source;
newRule.TABLENAME = table;
newRule.COLUMNNAME = column;
newRule.DATATYPE = datatype;
newRule.VALIDVALUELIST = valid;
newRule.VALIDATIONRULEID = newPK;
entities.AddToODS_VALIDATIONRULE(newRule);
entities.SaveChanges();
insertAccepted = true;
}
catch
{
// Log Error
}
The error I'm getting is this: "An error occurred while preparing the command definition. See the inner exception for details."
Inner Exception: "Operation is not valid due to the current state of the object."
Apparently the issue here was somewhere in the EDMX file and the way it read from Oracle. I deleted the table and recreated it in the DB as well as the EDMX and then added it back. It worked fine then.
The only thing I see that seems odd is you aren't using a sequence for your Pk value. You may try creating one and see if that helps at all.
Related
I am trying to execute below query
using (var dbcontext = new EVEntities())
{
var data_header = dbcontext.Cl.Where(x => x.PKey ==
header_key).FirstOrDefault();
if (data_header != null)
{
data_header.EstimatedCost = Math.Round(estimated_cost,2);
data_header.ClaimedCost = Math.Round(claimed_cost,2);
dbcontext.Entry<Cl>(data_header).State = System.Data.Entity.EntityState.Modified;
dbcontext.SaveChanges();
Writelog("Updated");
}
}
Here Writelog write in a text file and it is working always. But the field in Cl is not getting updated. In between the data is getting updated also.
Connection String
<connectionStrings><add name="EVEntities" connectionString="metadata=res://*/xxx_Entity_Model.csdl|res://*/xxx_Entity_Model.ssdl|res://*/xxx_Entity_Model.msl; provider=System.Data.SqlClient;provider connection string="data source=xxxxxx;initial catalog=xxxxx;persist security info=True;user id=xx;password=xxxxx;MultipleActiveResultSets=True;App=EntityFramework"" providerName="System.Data.EntityClient"/></connectionStrings>
Edit1
tried raw update also
dbcontext.Database.ExecuteSqlCommand(#"UPDATE dbo.Claims
SET EstimatedCost = #e_cost, ClaimedCost = #c_cost WHERE Pkey =
#p_key",
new SqlParameter("e_cost", Math.Round(estimated_cost, 2)),
new SqlParameter("c_cost", Math.Round(claimed_cost, 2)),
new SqlParameter("p_key", claim_header_key));
same outcome. It get updated in between. No error.
You didn't give us enough information to give you the solution. Therefore I give you a method to debug the problem.
Does the DbContext think that anything must be saved?
What SQL is sent to the database?
When you call SaveChanges, DbContext checks its ChangeTracker to see if anything must be updated. Consider to write some Debug code to detect whether there are changes.
Insert just before SaveChanges:
bool changesDetected = dbContext.ChangeTracker.HasChanges;
It might be that you need to call DetectChanges() first. I'm not sure.
If there are Changes, check if the item that you think that should be updated is changed:
IEnumerable <DbEntityEntry<Cl>> entries = dbContext.ChangeTracker.Entries<Cl>;
// We're expecting exactly one entry:
DbEntityEntry<Cl> myEntry = entries.SingleOrDefault();
Assert(myEntry != null);
If null, try to find out why it is not tracked. Was it tracked after you fetched it, before you changed it? Do you have somewhere tracking switched off? Write some other debug code where you fetch some other data. Is that tracked?
If not null, then apparently your Cl is tracked. It ought to be changed:
Assert(myEntry.State == EntityState.Modified);
If not modified, fetch the original values and the current values:
DbPropertyValues originalValues = myEntry.OriginalValues;
DbPropertyValues currentValues = myEntry.currentValues;
In your debugger, check them, or write some debug code to compare the original value with the current values. Are the changed values correct?
I'm not sure if entity framework will try to update objects that are unmodified and of which the original values are not equal to the current values. We'll find out to see what SQL is created when you do the SaveChanges.
It would be nice if your database can log all communications.
You can also log what entity framework sends to your database. For this, use property DbContext.Database.Log. For example:
dbContext.Database.Log = Console.Write;
dbContext.SaveChanges();
If you can't write to Console, write a method:
private List<string> SqlCommands {get;} = new List<string>();
void LogSqlCommands(string sqlCommand)
{
this.SqlCommands.Add(sqlCommand);
}
And in your method that following debug code:
using (var dbcontext = new EVEntities())
{
this.SqlCommands.Clear();
dbContext.Database.Log = this.LogSqlCommands;
var data_header = ... etc
dbContext.SaveChanges();
}
Put a breakpoint after SaveChanges and check the generated SQL.
Hope these debugging tips help you to find the cause of your problem
I'm trying to make a simple database insert for just one table, the insert and the connections are working perfectly.The problem appears only when the exceptions arise for entering bad data.
Here is my code: (using MySql and EF6)
using (MaintenanceDB db = new MaintenanceDB())
{
try
{
employee employee = new employee
{
ID = idTBA.textBox.Text,
EName = enTBA.textBox.Text,
AName = anTBA.textBox.Text,
CareerCode = careerCodeCBA.comboBox.SelectedItem.ToString(),
Specialization = specTBA.textBox.Text,
Mobile = mobileTBA.textBox.Text,
Telephone = teleTBA.textBox.Text,
Email = emailTBA.textBox.Text
};
db.employees.Add(employee);
db.SaveChanges();
}
catch (DbUpdateException exception)
{
MessageBox.Show(exception.InnerException.InnerException.Message);
}
catch (EntityException exception)
{
MessageBox.Show(exception.InnerException.Message);
}
}
so if the data entered correctly everything is smooth and fine, but if I entered duplicate ID for example the first time it's going to the first catch block and tell me there is a duplicate , at this point there is something wrong, it seems the connection isn't closed here (Despite using finally and dispose on db), the next time I hit the save button the error "Nested Transactions are not supported" appears, and then the db closes and I'm able to enter new data!
I tried opening the connection manually or starting a transaction and closing it manually as I found in few posts here but nothing seems to solve the problem
It seems like a mysql bug...., #71502
[27 Feb 15:54] Raif Atef
This bug is due to a bug in the MySqlTransaction class.
I'll start by asking am I right in thinking that in the image below:
the 'TABLE=CLOASEUCDBA.T_BASIC_POLICY' is not part of the connection string? in fact it is the source table name?
I'm looking to alter this to another linked table on the same database. The connection string should there be the same and the name that appears in ACCESS should be the same. The only difference should be under the hood it is actually referencing another table and of course if you open the table it will contain different fields and data.
my code for far to do this is:
var dbe = new DBEngine();
Database db = dbe.OpenDatabase(#"C:\Users\xxxx\Documents\Test.accdb");
foreach (TableDef tbd in db.TableDefs)
{
if (tbd.Name.Contains("CLOASEUCDBA_T_BASIC_POLICY"))
{
tbd.SourceTableName = "CLOASEUCDBA_T_BILLING_INFORMATION";
}
}
db.Close();
However I'm getting a big fat COMException "Cannot set this property once the object is part of a collection.". I'm not sure exactly why and all the examples I can find online are all written in VB/VBA and I only have very very limited exposure to this. Any help is appreciated.
EDIT:
I have tried to go a different route with no futher success using the code:
if (tbd.Name.Contains("CLOASEUCDBA_T_BASIC_POLICY"))
{
var newtable = db.CreateTableDef("this is a new table");
newtable.Name = "new table";
newtable.Connect = tbd.Connect;
newtable.SourceTableName = "CLOASEUCDBA_T_BILLING_INFORMATION";
db.TableDefs.Append(newtable);
//tbd.SourceTableName = "CLOASEUCDBA_T_BILLING_INFORMATION";
}
In this case I get the error "ODBC--call failed."
Since we're not allowed to change the SourceTableName of a TableDef object that already exists in the TableDefs collection we need to create a new TableDef object, .Delete the old one, and then .Append the new one:
// This code requires the following COM reference in your project:
//
// Microsoft Office 14.0 Access Database Engine Object Library
//
// and the declaration
//
// using Microsoft.Office.Interop.Access.Dao;
//
// at the top of the class file
string tableDefName = "CLOASEUCDBA_T_BASIC_POLICY";
var dbe = new DBEngine();
Database db = dbe.OpenDatabase(#"C:\Users\xxxx\Documents\Test.accdb");
var tbdOld = db.TableDefs[tableDefName];
var tbdNew = db.CreateTableDef(tableDefName);
tbdNew.Connect = tbdOld.Connect;
tbdNew.SourceTableName = "CLOASEUCDBA_T_BILLING_INFORMATION";
db.TableDefs.Delete(tableDefName); // remove the old TableDef ...
db.TableDefs.Append(tbdNew); // ... and append the new one
db.Close();
I have developed a WCF api which is using nHibernate. I am new to this. I have used session.update to take care of transaction. I have a for loop in which based on select condition I am updating a record ie. If A is present in tabel1 then I am updating the table else inserting a new entry.
I am getting "could not execute query." when trying to execute a select query on a table which was previously being updated by adding a new entry in the table.
What I think is, because I am using session.save(table1) and then trying select entries from that table I am getting an error. Since session.save temporarily locks the table I am not able to execute a select query on that table.
What can be the solution on this?
Update:
This the for loop I am using to check in the database for some field:
using (ITransaction tranx = session.BeginTransaction())
{
savefunction();
tranx.Commit();
}
Save function:
public void savefunction()
{
for (int i = 0; i < dictionary.Count; i++)
{
ICandidateAttachmentManager candidateAttach = new ManagerFactory().GetCandidateAttachmentManager();
CandidateAttachment attach = new CandidateAttachment();
attach = checkCV();
if(attach == null)
{
//insert new entry into table attach
session.save(attach);
}
}
}
checkCV function:
public void checkCV()
{
using (ICandidateAttachmentManager CandidateAttachmentManager = new ManagerFactory().GetCandidateAttachmentManager())
{
IList<CandidateAttachment> lstCandidateAttachment = CandidateAttachmentManager.GetByfkCandidateId(CandidateId);
if (lstCandidateAttachment.Count > 0)
{
CandidateAttachment attach = lstCandidateAttachment.Where(x => x.CandidateAttachementType.Id.Equals(FileType)).FirstOrDefault();
if (attach != null)
{
return null;
}
else
{
return "some string";
}
}
}
}
What happening here is in the for loop if say for i=2 the attach value comes to null that I am entering new entry into attach table. Then for i=3 when it enters checkCV function I get an error at this line:
IList lstCandidateAttachment =
CandidateAttachmentManager.GetByfkCandidateId(CandidateId);
I think it is because since I am using session.save and then trying to read the tabel contents I am unable to execute the query and table is locked till I commit my session. Between the beginTransaction and commit, the table associated with the object is locked. How can I achieve this? Any Ideas?
Update:
I read up on some of the post. It looks like I need to set isolation level for the transaction. But even after adding it doesn't seem to work. Here is how I tried to inplement it:
using (ITransaction tranx = session.BeginTransaction(IsolationLevel.ReadUncommitted))
{
saveDocument();
}
something I don't understand in your code is where you get your nHibernate session.
Indeed you use
new ManagerFactory().GetCandidateAttachmentManager();
and
using (ICandidateAttachmentManager CandidateAttachmentManager = new ManagerFactory().GetCandidateAttachmentManager())
so your ManagerFactory class provides you the ISession ?
then you do:
CandidateAttachment attach = new CandidateAttachment();
attach = checkCV();
but
checkCV() returns either a null or a string ?
Finally you should never do
Save()
but instead
SaveOrUpdate()
Hope that helps you resolving your issue.
Feel free to give more details
I'm making a rather "simple" piece of software and at the moment I'm working with one table in my database and reading from the database works and now I was trying to implement inserting into the database, which seems to work as long as the program is running, but when I stop the program (stop debugging in VS) and launch it again, the rows don't seem to be in the database (already checked the .mdf database itself for the rows but they can't be found).
This is the piece of code:
public void saveKlant(klant nieuweKlant)
{
KlantGegevens newKlant = new KlantGegevens();
newKlant.klantNaam = nieuweKlant.naam;
newKlant.klantStraat = nieuweKlant.straat;
newKlant.klantPostcode = nieuweKlant.postcode;
newKlant.klantHuisNummer = nieuweKlant.huisnummer;
newKlant.klantGSM = nieuweKlant.gsm;
newKlant.klantTel = nieuweKlant.telnummer;
newKlant.klantGebDatum = nieuweKlant.gebDatum;
newKlant.klantEmail = nieuweKlant.email;
using (kapsalonEntities context = new kapsalonEntities())
{
try
{
context.KlantGegevens.AddObject(newKlant);
int test = context.SaveChanges();
}
catch
{
throw new InvalidOperationException("het object kon niet toegevoegd worden");
}
}
}
"test" equals 1 (so context.SaveCHanges() = 1) when running the program.
what would be the reason for the data to not be added persistently? since I do use a Context.SaveChanges()?
Thanks in advance.
It looks like you didn't check of the property where the database each time copies himself toi the debug directory. That's why you always get your default data again. Set the property to "if newer"