I am trying to update 2 tables: RESTAURANT and HOURS. The tables shere the REST_ID key. I get an error on the line with the arrow (==>): Sorry, I'm trying to teach myself this stuff and it's the first time I've tried a multi-table insert.
The object could not be added or attached because its EntityReference
has an EntityKey property value that does not match the EntityKey for
this object.
RESTAURANT addRest = new RESTAURANT();
addRest.REST_NAME = r_name;
addRest.REST_STREET1 = r_street;
addRest.CITY_ID = c_id;
addRest.REST_PHONE = r_phone;
addRest.REST_WEBSITE = r_web;
addRest.HOUR = new HOUR();
addRest.HOUR.HOURS_SUN = h_su;
addRest.HOUR.HOURS_MON = h_mo;
addRest.HOUR.HOURS_TUE = h_tu;
addRest.HOUR.HOURS_WED = h_we;
addRest.HOUR.HOURS_THU = h_th;
addRest.HOUR.HOURS_FRI = h_fr;
addRest.HOUR.HOURS_SAT = h_sa;
addRest.HOURReference.EntityKey = new EntityKey("FVTCEntities.HOURS", "HOURS", 1);
==> db.AddToRESTAURANTs(addRest);
db.SaveChanges();
That isn't LINQ to SQL. It's Entity Framework.
You don't need to set the EntityKey, usually. Just set the HOUR properties like any POCO type. Ignore EntityKey unless you have a very specific reason to set it.
Related
I need to insert records to an Oracle DB table that already has records in it by using the table's sequence.
I tried using RQL which creates an auto-generated id for the primary key but sometimes those generated ids already exist in the database and as a result, a constraint violation error is thrown.
ATG documentation provides an alternative named Overriding RQL-Generated SQL but I didn't manage to make it work for insert statements.
GSARepository repo =
(GSARepository)request.resolveName("/examples/TestRepository");
RepositoryView view = repo.getView("canard");
Object params[] = new Object[4];
params[0] = new Integer (25);
params[1] = new Integer (75);
params[2] = "french";
params[3] = "greek";
Builder builder = (Builder)view.getQueryBuilder();
String str = "SELECT * FROM usr_tbl WHERE (age_col > 0 AND age_col < 1
AND EXISTS (SELECT * from subjects_tbl where id = usr_tbl.id AND subject
IN (2, 3)))";
RepositoryItem[] items =
view.executeQuery (builder.createSqlPassthroughQuery(str, params));
Is there any way to use table's sequence for insert statements via ATG Repository API?
Eventually, I did not manage to make it work but I found the following solution.
I retrieved the sequence number as below and then used it in the RQL insert statement.
RepositoryView view = getRestServiceDetailsRepository().getView("wsLog");
String sql = "select log_seq.nextval from dual";
Object[] params = {};
Builder builder = (Builder) view.getQueryBuilder();
Query query = builder.createSqlPassthroughQuery(sql, params);
RepositoryItem[] items = view.executeQuery(query);
if (items != null && items.length > 0) {
items[0].getRepositoryId();
}
For auditing reasons I am overriding the SaveChanges function. However, I want to capture to original and current values as the original object (i.e person) so that I can serialize both the before and after.
Public Overrides Function SaveChanges() As Integer
ChangeTracker.DetectChanges()
Dim ctx As ObjectContext = DirectCast(Me, IObjectContextAdapter).ObjectContext
Dim objectStateEntryList As List(Of ObjectStateEntry) = ctx.ObjectStateManager.
GetObjectStateEntries(EntityState.Added Or EntityState.Modified Or EntityState.Deleted).ToList()
For Each ent As ObjectStateEntry In objectStateEntryList
If Not ent.IsRelationship Then
Dim objectType As Type = ObjectContext.GetObjectType(ent.Entity.GetType)
Dim audit As New Audit With {
.ObjectId = ent.EntityKey.EntityKeyValues.First.Value,
.ObjectType = ObjectContext.GetObjectType(ent.Entity.GetType).Name,
.User = (From u In Users Where u.Username = My.User.Name).First
}
With audit
Select Case ent.State
Case EntityState.Added
.Action = "Created"
.Detail = "Record created"
Case EntityState.Deleted
.Action = "Deleted"
.Detail = "Record deleted"
Case EntityState.Modified
Dim newObj As String = SerializeToString(
Convert.ChangeType(ent.Entity, objectType)
)
.Action = "Modified"
.Detail = newObj.ToString
End Select
End With
End If
Next
Return MyBase.SaveChanges()
End Function
That's how far I got, but when I try and ChangeType it throws "Object must implement IConvertible".
The last time I worked on a project that absolutely needed to track every change, we used a history table and an ON UPDATE trigger. Changing data would fire the trigger, which would then copy the original row into the history table.
This is 100% EF compatible, but you need to set it up separately for each table.
This doesn't exactly answer your main question but may help you to improve your auditing.
Disclaimer: I'm the owner of the project Entity Framework Plus
I recommend you to look at our EF+ Audit Feature, all auditing information can be easily retrieved using this library.
// using Z.EntityFramework.Plus; // Don't forget to include this.
var ctx = new EntityContext();
// ... ctx changes ...
var audit = new Audit();
audit.CreatedBy = "ZZZ Projects"; // Optional
ctx.SaveChanges(audit);
// Access to all auditing information
var entries = audit.Entries;
foreach(var entry in entries)
{
foreach(var property in entry.Properties)
{
}
}
// CALL your serializer here
SerializeToString(entries, ...);
The code is Open Source.
I have the following configuration to set NH and Envers up:
var properties = new Dictionary<string, string>();
properties[NHibernate.Cfg.Environment.Dialect] = "NHibernate.Dialect.MsSql2008Dialect";
properties[NHibernate.Cfg.Environment.ConnectionDriver] = "NHibernate.Driver.SqlClientDriver";
properties[NHibernate.Cfg.Environment.Hbm2ddlAuto] = "update";
properties[NHibernate.Cfg.Environment.FormatSql] = "true";
properties[NHibernate.Cfg.Environment.ShowSql] = "true";
properties[NHibernate.Cfg.Environment.ConnectionString] = "Data Source=localhost;Initial Catalog=OU_KASH;Integrated Security=True;Asynchronous Processing=true";
var cfg = new Configuration();
cfg.Configure()
.SetProperties(properties)
.AddAssembly(typeof(AliasTb).Assembly.FullName)
;
cfg.SetEnversProperty(ConfigurationKey.StoreDataAtDelete, true);
cfg.SetEnversProperty(ConfigurationKey.AuditStrategy, typeof(NHibernate.Envers.Strategy.ValidityAuditStrategy));
cfg.SetEnversProperty(ConfigurationKey.TrackEntitiesChangedInRevision, true);
cfg.SetEnversProperty(ConfigurationKey.GlobalWithModifiedFlag, true);
cfg.IntegrateWithEnvers(new AttributeConfiguration());
var factory = cfg.BuildSessionFactory();
If I leave off the
cfg.SetEnversProperty(ConfigurationKey.AuditStrategy, typeof(NHibernate.Envers.Strategy.ValidityAuditStrategy));
it works fine, but with that option I get the following exception when I commit my transaction (which updates a CompanyAddressTb object):
ERROR NHibernate.AssertionFailure - An AssertionFailure occurred - this may indicate a bug in NHibernate or in your custom types.
System.InvalidOperationException: Cannot find previous revision for entity NhDoodling.Entities.Domain.CompanyAddressTb_AUD and id 12962904
at NHibernate.Envers.Strategy.ValidityAuditStrategy.updateLastRevision(ISession session, AuditConfiguration auditCfg, IList l, Object id, String auditedEntityName, Object revision, Boolean throwIfNotOneEntry)
at NHibernate.Envers.Strategy.ValidityAuditStrategy.Perform(ISession session, String entityName, Object id, Object data, Object revision)
at NHibernate.Envers.Synchronization.Work.AbstractAuditWorkUnit.Perform(ISession session, Object revisionData)
at NHibernate.Envers.Synchronization.AuditProcess.executeInSession(ISession executeSession)
at NHibernate.Envers.Synchronization.AuditProcess.DoBeforeTransactionCompletion()
at NHibernate.Envers.Synchronization.AuditProcessManager.<>c__DisplayClass4.<Get>b__0()
at NHibernate.Engine.ActionQueue.BeforeTransactionCompletionProcessQueue.BeforeTransactionCompletion()
Any help will be greatly appreciated.
If you start to use Envers on a non empty db, you need to manually insert current data in audit tables.
Read more here.
I have two tables, RESTAURANT and HOURS with REST_ID as the key between the two tables. i receive an error when I get to the first line of code to add HOURs. The error asks to create an instance of the object but Intellisence allows me to call that table reference. Here is a snipped of the code:
RESTAURANT addRest = new RESTAURANT();
addRest.REST_NAME = r_name;
addRest.REST_STREET1 = r_street;
addRest.REST_PHONE = r_phone;
addRest.REST_WEBSITE = r_web;
addRest.REST_DESC = r_desc;
addRest.HOUR.HOURS_SUN = h_su;
addRest.HOUR.HOURS_MON = h_mo;
addRest.HOUR.HOURS_TUE = h_tu;
addRest.HOUR.HOURS_WED = h_we;
addRest.HOUR.HOURS_THU = h_th;
addRest.HOUR.HOURS_FRI = h_fr;
addRest.HOUR.HOURS_SAT = h_sa;
addRest.HOURReference.EntityKey = new EntityKey("FVTCEntities.HOURS", "HOURS", 1);
db.AddToRESTAURANTs(addRest);
db.SaveChanges();
HOUR is a contained object inside of RESTAURANT. You need to instantiate it before setting properties on it (like a typical C# object):
addRest.HOUR = new HOUR();
addRest.HOUR.HOURS_SUN = h_su;
...
You haven't created an HOUR object on your RESTAURANT, so that navigation property is null.
...
addRest.REST_DESC = r_desc;
addRest.HOUR = new HOUR();
addRest.HOUR.HOURS_SUN = h_su;
...
I am using LINQ to SQL queries to return data in my application. However I find it is now needful for me to return the column Names. Try as I might I have been completely unable to find out how to do this on the internet.
So if my LINQ entity table has the properties (Last_Name, First_name, Middle_Name) I need to return:
Last_name
First_Name
Middle_name
rather than the usual
Smith
John
Joe
You could certainly do it with some LINQ-To-Xml directly against the ".edmx" file or the embedded model resources in the compiled assembly.
The below query gets the field (not column) names. If you need the columns then just change the query to suit.
var edmxNS = XNamespace.Get(#"http://schemas.microsoft.com/ado/2007/06/edmx");
var schemaNS = XNamespace.Get(#"http://schemas.microsoft.com/ado/2006/04/edm");
var xd = XDocument.Load(#"{path}\Model.edmx");
var fields =
from e in xd
.Elements(edmxNS + "Edmx")
.Elements(edmxNS + "Runtime")
.Elements(edmxNS + "ConceptualModels")
.Elements(schemaNS + "Schema")
.Elements(schemaNS + "EntityType")
from p in e
.Elements(schemaNS + "Property")
select new
{
Entity = e.Attribute("Name").Value,
Member = p.Attribute("Name").Value,
Type = p.Attribute("Type").Value,
Nullable = bool.Parse(p.Attribute("Nullable").Value),
};
Lets assume you're talking about the Contact Table in the assembly named YourAssembly in a Context called MyDataContext
Using Reflection against a Table
You can use reflection to get the properties like you would any type
var properties = from property in
Type.GetType("YourAssembly.Contact").GetProperties()
select property.Name
;
foreach (var property in properties)
Console.WriteLine(property);
As shaunmartin notes this will return all properties not just Column Mapped ones. It should also be noted that this will return Public properties only. You'd need to include a BindingFlags value for the bindingAttr Parameter of GetProperties to get non-public properties
Using the Meta Model
You can use the Meta Model System.Data.Linq.Mapping to get the fields ( I added IsPersistant to only get the Column Mapped properties)
AttributeMappingSource mappping = new System.Data.Linq.Mapping.AttributeMappingSource();
var model = mappping.GetModel(typeof (MyDataContext));
var table = model.GetTable(typeof (Contact));
var qFields= from fields in table.RowType.DataMembers
where fields.IsPersistent == true
select fields;
foreach (var field in qFields)
Console.WriteLine(field.Name);
Using Reflection from a query result
If on the other hand you wanted it from a query result you can still use reflection.
MyDataContextdc = new MyDataContext();
Table<Contact> contacts = dc.GetTable<Contact>();
var q = from c in contacts
select new
{
c.FirstName,
c.LastName
};
var columns = q.First();
var properties = (from property in columns.GetType().GetProperties()
select property.Name).ToList();
I stumbled upon this answer to solve my own problem and used Conrad Frix 's answer. The question specified VB.NET though and that is what I program in. Here are Conrad's answers in VB.NET (they may not be a perfect translation, but they work):
Example 1
Dim PropertyNames1 = From Prprt In Type.GetType("LocalDB.tlbMeter").GetProperties()
Select Prprt.Name
Example 2
Dim LocalDB2 As New LocalDBDataContext
Dim bsmappping As New System.Data.Linq.Mapping.AttributeMappingSource()
Dim bsmodel = bsmappping.GetModel(LocalDB2.GetType())
Dim bstable = bsmodel.GetTable(LocalDB.tblMeters.GetType())
Dim PropertyNames2 As IQueryable(Of String) = From fields In bstable.RowType.DataMembers
Where fields.IsPersistent = True
Select fields.Member.Name 'IsPersistant to only get the Column Mapped properties
Example 3
Dim LocalDB3 As New LocalDBDataContext
Dim qMeters = From mtr In LocalDB3.tblMeters
Select mtr
Dim FirstResult As tblMeter = qMeters.First()
Dim PropertyNames3 As List(Of String) = From FN In FirstResult.GetType().GetProperties()
Select FN.Name.ToList()
To display the results:
For Each FieldName In PropertyNames1
Console.WriteLine(FieldName)
Next
For Each FieldName In PropertyNames2
Console.WriteLine(FieldName)
Next
For Each FieldName In PropertyNames3
Console.WriteLine(FieldName)
Next
Please also read Conrad's answer for notes on each method!