Ef core duplicate key exception

CommentBy). Feb 27, 2023 · EF Core Query results in argument exception An item with the same key has already been added. Restrict violation Unique Jan 23, 2015 · This exception was being thrown because I had not declared the primary key as composite key in one of the tables. Using the concept of detached entities, EF Core can duplicate entities and automatically update their foreign keys. So if I understand correctly, the only way to avoid duplicates with first querying is to have a pre-defined unique index value. Add(new Item()). ToList(); everthing works great. 6 Item With Same Key Has Already Been Added Feb 8, 2022 · If you are still having issues, here is an example to try using LocalDb . Model: Feb 10, 2019 · Cannot insert duplicate key in object 'dbo. I have two classes named Ingredient and Item and then I have a class named ItemIngredient and the first entry with itemid 1 and ingredientid 1 was okay. ** I tried different manners with more context. The following example chooses a Name property as a key to perform the BulkMerge operations and also allows a duplicate key. The exception message is: Violation of PRIMARY KEY constraint 'PK_Nazione'. Your code: List<Address> ListOfAdresses = //(from DB)! in the data access code: When DbSet. InnerException. cs. These tables have many-to-many relation (I config them in database context) I want to add new record to watchlist table but AddAsync throws DbUpdate Exception. Feb 3, 2021 · If you are wanting to insert rows with a duplicate key into an EF DbSet, then no, this isn't possible. One such exception is the Npgsql. @ajcvickers, sorry I missed that SaveChanges is only called on the "duplicate"; that works. InvalidOperationException: 'The instance of entity type 'Animal' cannot be tracked because another instance of this type with the same key is already being tracked. PostgresException Saving Orders in . Identity resolution ensures Entity Framework Core (EF Core) is tracking a consistent graph with no ambiguities about the relationships or property values of the entities. ApplicationUserProject'. Most entities in EF have a single key, which maps to the concept of a primary key in relational databases (for entities without keys, see Keyless entities). net core 3. an ApplicationUser) for you. EF doesn't care which unique index, unique constraint, or Primary Key constraint you use for the entity key. TournamentUser'. to ignore the entities that already existed in the database, and commit the Inner Exception SqlException: Cannot insert duplicate key row in object ‘dbo. I set up the entity key as. – Aug 11, 2020 · The instance of entity type 'Data' cannot be tracked because another instance with the key value '{Id : 1657126}' is already being tracked. Convert them into Result. It's my first project with using Entity Framework Core and sometimes the relationships are a bit confusing for me. SaveChanges, I get a DbUpdateException: An unhandled exception of type 'System. System. The database is created by script with: CREATE DATABASE IF NOT EXISTS foo_db CHARACTER SET utf8mb4 COLLATE Jul 15, 2018 · How to capture a database exception in EF Core. Challenge'. var ctx = new DbContext(); var transaction = await ctx. After inserting one more seeded row manually via pgAdmin and restarting the app the problem did not appear anymore. Infrastructure. By delegating these checks to the database, you can simplify your application logic, Warning. I can provide both projects, one . " OnModelCreating I have this code: modelBuilder. CreateAddedEntity<Student>(); and then step 1 var connections = context. SaveChanges(), EF is trying to insert new A entity instead of using the already existing one. PricingPlan). Languages. Dec 24, 2017 · I experienced this same issue after seeding data for my tests and then trying to insert a new entity. Jan 1, 2021 · I have a use case where a third party provides an enumeration of items that I wish to merge into a database using EF Core. A key serves as a unique identifier for each entity instance. I'm sure you're already familiar with this property, but I struggled to find this issue again because none of the other comments mention that specific argument by name. Exception message: Feb 2, 2021 · 1. SaveChanges() in EF Core Mar 19, 2014 · When calling DbContext. I am getting an issue about duplicate keys when merging many to many items. Jun 5, 2023 · EF Core version: 7. Whenever I add a new entity instance using the InMemory provider, the primary key is not automatically incremented and a duplicate key exception is thrown. The duplicate key value is (39b72c3a-b5bf-43e4-84f9-5cddbe79f6e3). + Database provider: mysql OR inmemory OR sqlserver (any will fail into bug) Target framework: . Configuration. Entities can have additional keys beyond the primary key (see Alternate Keys for more information). dbo. Let’s say that we want to handle this exception in a very specific way, for us to do this we would have to have a bit of a messy try/catch statement : Aug 7, 2022 · A meal can have many tags, a tag can have many meals. try-catch. When inserting explicit IDs (during seeding), PostgreSQL doesn't update the sequence value for auto-generated columns; this results in unique constraint violations when the user next attempts to insert a new entity. xisting entities, ensure that only one entity instance with a given key value is attached. AgaveJoe 1,495. Consider using 'DbContextOptionsBuilder. Calling AddAsync, Update etc via the DbContext throws the alternate key property 'id' is null exception; Further technical details. DbUpdateException' occurred in Microsoft. Apr 8, 2020 · The CREATE UNIQUE INDEX statement terminated because a duplicate key was found for the object name 'dbo. Jul 23, 2018 · To tell ef that slaves had a combined key I override OnModelCreating having the content: modelbuilder. Oct 17, 2015 · Violation of PRIMARY KEY constraint 'PK_dbo. SqlException: Violation of PRIMARY KEY constraint 'PK_IdentityUser'. PostgresException: 23505: duplicate key value violates unique constraint Below are my entity models: Role and User. I made use of EF Core 6 here to create the database giving it only the following two classes (Summarized): public class Meal { [Key] public Guid Id { get; set; } public ICollection<Tag>? Tags { get; set; } } public class Tag { [Key] public string? Nov 17, 2020 · Using MySql DB and Entity Framework, when im trying insert a data that contais a lists of child data i recive this error: InnerException = {&quot;Duplicate entry '1' for key 'PRIMARY'&quot;} Here May 5, 2023 · Whem working with EF Core, we'll for sure get SQL exceptions at a certain point. May 15, 2014 · How to handle Duplicate Key Exception in Entity Framework 4. entity-framework. Fortunately, EF Core can be manipulated to make this duplication trivial. SqlException (0x80131904): Violation of PRIMARY KEY constraint 'PK_TournamentUser'. The duplicate key value is (5685a830-cb82-4b60-b459-c0852cc74563, 229698cd-eebb-432b-e6eb-08d9b62cc799). But what if we want to perform some custom exception recovery based on the S May 15, 2021 · I'm building an application using Entity Framework and C#, and in one of my tables, I noticed I named the column with the primary key the same name as the foreign key column i. Apr 15, 2020 · Create a fluent mapping as per above where DeviceVerificationResponse class has a string property called Id (primary key). There are several ways for EF to implement the physical tables for your inheritance hierarchy. Add(item); try. Key: c0 caused by generated duplicate table alias Code Query causing the problem: var query = dbContext. HasKey("MasterId", "Discriminator"); base. The UniqueErrorFormatter method reformats this into a message. Dec 8, 2020 · Summary. A. The primary key by default is a clustered index, but if you have a table containing information about widgets and each widget must have a serial number different from all other widgets, then that's a candidate for a unique, non-clustered index on the serial number column to enforce the rule. The easiest way to do this is actually to catch the appropriate exception. Mar 8, 2019 · Inner Exception 1: SqlException: Violation of PRIMARY KEY constraint 'PK_Challenge'. Even if you call Add, the entities with non default PKs (e. But be careful: you must make sure the ApplicationUser already exists. Mar 1, 2020 · Sounds like the same issue. Web/ database update Jul 5, 2023 · The general approach to handle a concurrency conflicts is: Catch DbUpdateConcurrencyException during SaveChanges. . Assembly: System. 2. dll. The default one, the one you are using, is called Table Per Hierarchy (TPH). e. Apr 16, 2019 · . It seems PRIMARY KEY comparison is ignoring accents. Entry(comment. State= EntityState. When SaveChanges method is invoked, Ef core will try to insert the y into db, this caused the duplicate key exception thrown. 41. The duplicate key value is (9781617294563). WithMany(c => c. Jun 1, 2020 · Duplicate key value violates unique constraint (EF Core & PostgresSQL) 3 Entity Framework Core 3. Keys must be unique. this bug can be fixed if the orm would be kind enough to delete the duplicate entries before adding the new entries Linq. public class DuplicateKeyException : InvalidOperationException. Database. c#. Add(new Animal { Name: "Cat" }) Following exception is thrown: System. Or use a Raw SQL Query to perform the update, which is probably your best bet. AuditEntries property gets or sets if a duplicate key is possible in the source. MySqlException : 'Duplicate entry 'GUÈN10' for key 'PRIMARY''. For example if you first call step 2 var student = context. 0 that produces this issue if needed. I. Proc. BeginTransactionAsync(); Feb 4, 2021 · It seems to me that you have many to many relationship. Customers table it has a relationship with has a foreign key on Feb 14, 2020 · Entity Framework Core: Violation of PRIMARY KEY constraint Cannot insert duplicate key in object Load 7 more related questions Show fewer related questions 0 Dec 30, 2021 · MySqlConnector. AsSplitQuery() Jan 1, 2021 · Excellent feedback folks; thank you! @stevendarby, agreed on the transaction. The duplicate key value is (Post 1). DbUpdateException(String, Exception, IReadOnlyList<EntityEntry>) Initializes a new instance of the DbUpdateException class. Data. The solution that fixes this issue states:. One possible issue would be if "Context" was somehow resolving to a new DbContext instance with each access such as: private YourAppDbContext Context. The duplicate key value is (1). Linq. We have an unique key (on 'name' column) on a table. This can only be done via the Fluent API. Jul 20, 2015 · In my case, I'm using EF 6 and decorated one of the properties in my model with: [Index(IsUnique = true)] To catch the violation I do the following, using C# 7, this becomes much easier: protected async Task<IActionResult> PostItem(Item item) {. " string. Offending code: ``` Exception data: Severity: ERROR SqlState: 23505 MessageText: duplicate key value violates unique constraint "PK_ScrapeTargets" Detail: Detail redacted as it may contain sensitive data. ContainerConfigurations . When attaching existing entities, ensure that only one entity instance with a given key value is attached. You can't tell EF to silently ignore one database exception while running one transaction. Normally, a 1:1 association is implemented by a primary key that's also the foreign key to the parent. 0, Guid. It uses only one table for all the derived entities, with one Discriminator column to specify the type of entity which is contained in the record. Cannot insert duplicate key in object 'dbo. Animals. There are use cases where the third party provides an item with the same key more than once in the enumeration . LanguageId); User user = new User. SqlClient. The exception was being thrown at the above code so I posted it. So you need to set up a new entity with primary key to be composite for mapping and to configure the entities the right way: (In EF Core up to and including 3. ---> Npgsql. Thrown when an attempt is made to add an object to the identity cache by using a key that is already being used. Aug 27, 2022 · I'm using the Entity Framework Code First with Migrations, and I created these two entities UserAccount: public class UserAccountModel { [Key()] public Guid Id { get; set; } public string Jul 11, 2018 · That way if a duplicate is about to be added I can let them know and fix it appropriately. Dec 25, 2018 · So EF Core does not know if there is an existing course which needs to be deleted first before inserting another course with same Id. NET Core 2. The entities are new, but for some reason EF is attempting to insert the primary key column causing a duplicate primary key exception (attempting to insert an entity with Key '0', which already exists in the DB. I want to add items to test database for integration test . I'm really confused about that do so I would be very glad if someone could explain why on the second call to context. Object. So I can't use the database because inserting new values throws a duplicated entry exception. ) will be considered as existing. What could be possible solutions for this? Aug 30, 2019 · Duplicating an item of this kind is more complicated since a user must copy all the sub-entities and then update their foreign keys. Apparently this is how you are suppose to catch the exception but ex. SqlException (0x80131904): Violation of PRIMARY KEY constraint 'PK_ApplicationUserProject'. However, unlike in previous versions of Entity Framework, you cannot use the Key attribute to define composite keys. Oct 27, 2023, 6:31 AM. Single(x => x. Sep 23, 2021 · 1. public class VersionMaster { public int TestCaseID { get; set; } public bool IsDeleted { get; set; } } Apr 19, 2018 · Right after applying a migration which includes seeded data my app using EF Core 3. net. Entity. HasKey(t => new { t. . PostgresException: 23505: duplicate key value violates unique constraint 7 PostgresException: 23505: duplicate key value violates unique constraint "PK_country" Mar 10, 2024 · When I attempt to create a new Provincia with an existing Nazione, I'm encountering a Microsoft. Is there a way to tell EF Core to ignore the entities that failed? i. DbUpdateException' occurred in EntityFramework. I want to insert new Animal with following code: context. NET Core and EF Core, it is common to encounter exceptions when saving data. Especially since you might be able to send all the (StripeTransferId, State) pairs to the database in one call using a Table-Valued parameter , JSON , XML, or 1. Apr 18, 2024 · When developing an application that connects to a SQL Server (or Azure SQL) database, you will often want to leverage the features that the database engine provides to help minimise checks that would otherwise need to be performed at the application level. ArgumentException: An item Oct 24, 2023 · Entity Framework Core. Mar 5, 2013 · And with C#7 and a wrapping exception (like Entity Framework Core): Working code for filter only duplicate primary key voilation exception. Entity<Slave>(). }]. My existing code uses SqlBulkCopy() and "IGNORE_DUP_KEY = ON", all is well with duplicates. Nov 18, 2022 · See the inner exception for details. asp. The duplicate key value is (15ae8798-8567-457b-812a-5820cf7843e5). MembershipTypes table's primary key is on "MembershipTypeId" property, and the dbo. Feb 11, 2018 · Pull the existing unique keys from the database first and only insert the ones that don't match. ConstraintName and ConstraintProperties will be populated only if the index is defined in the Entity Framework Model. g. May 28, 2024 · Entity Framework Core add unique constraint code-first 1 Duplicate key value violates unique constraint "b_name_key" after save @ManyToOne entity by Spring-boot, Spring-data, Hibernate Nov 27, 2020 · Duplicate key value violates unique constraint (EF Core & PostgresSQL) 0. Add method is invoked, Ef core set EntryState of y to Add by default. Mar 8, 2020 · I am importing data from a CSV file into a SQL Server DB, the CSV may contain duplicate entries. A = item. Refresh the original values of the concurrency token to reflect the current values in the database. DbUpdateException(String, Exception, IReadOnlyList<IUpdateEntry>) Initializes a new instance of the DbUpdateException class. May 7, 2019 · An unhandled exception occurred while processing the request. Creating Unique Index with Entity Framework 6. I did indeed decide to wrap the whole thing up in a transaction scope and it did work fine with the two SaveChanges() -- which, as you point out, appear to be needed due to the primary key conflict with the deletes and subsequent inserts. – Gert Arnold Mar 1, 2023 · Entity Framework Extensions AllowDuplicateKeys Description. PricingPlanId); What Jul 31, 2014 · This is because entity framework tracks the changes and manages the entities per context. EntityFrameworkCore. Only when a duplicate is found the process will be slower. 1 with the new EF tooling (preview4) Added the configuration as specified in EF ModelBuilder below; Applied Migration and updated database; Commands: dotnet ef --startup-project . When working with databases in . Movies'. The duplicate key value is (a5139db8-64c1-49a2-97ef-55009259dc23). 0. Mar 11, 2020 · We use ef core 3. The problem is when I'm creating a database migration, it always add foreign keys I haven't defined. Teacher_Students. _DbContext. ProxyCreationEnabled is set to true as default. Any suggestions would help. On SQL Server this can be achieved with the IGNORE_DUP_KEY argument on the index, but using that throws exceptions in EF Core, presumably because of entity change tracking. You have to traverse the inner exceptions until you find the SqlException, for which you can use this method: public TException GetInnerException<TException>(Exception exception) Apr 1, 2020 · You should be able to do is the following: create a stored procedure that receives the parcels and does an insert paired with a join on the column with the unique key constraint (= filter out all that already have a value in the where condition) call the stored procedure from your code and pass the parcels. When parent and child are the same entity class, two records of the same Mar 14, 2021 · Microsoft. in case you need an artificial id Sep 4, 2018 · The order of the four steps are important. The BulkOperation. Of if you just comment out step 1, 3 or 4 everything works great. HasForeignKey(a=>a. context. PostgresException (0x80004005): 23505: duplicate key value violates unique constraint "PK_Departamente" In the Entity (ModificareInregistrare) I want to add, I have a reference to a Department that exists in the database. EnableSensitiveDataLogging' to see the conflicting key The best option here, is to block only those who violated the key sanity. The statement has been terminated. Apr 15, 2022 · I need to handle different kinds of exceptions that comes from SQL. 58. Unchanged; so that the EF Core will not create a new CommentBy (i. 1 fluent API. SaveChanges() results in System. Empty etc. As'. Owner = owner; Apr 3, 2021 · Can't insert entity Entity framework duplicate key exception. However after about 3-4 tries performing the same operation (and seeing the exception), the entity does get inserted and the key is correctly incremented. I think EF Core should be able to detect that the same primary key should map to the same entity. There's a nice question about this on Stack Overflow, which I would like to borrow some information from: Duplicate key exception from Entity Framework? Jan 13, 2021 · The duplicate key value is (Lemon). exception. Nazione' When you say you have an index that is the primary key, that's not the index u/Tyrrrz is suggesting. Items. I'm afraid "deep cloning" is not EF Core target. These properties will not be populated if the index exists in the database but isn't part of the model or if the index is added with MigrationBuilder. get { return new YourAppDbContext(); } Dec 24, 2013 · After the first check you could refine the check to find out which of the 1000 records is the culprit. e => new { e. OnModelCreating(modelbuilder); But if I try to add a value to the context I got an exception: May 1, 2024 · Duplicate Key Value Violation: Npgsql. Actually, you should do something like this (not tested): static void Main(string[] args) {. Violation of PRIMARY KEY constraint 'PK_Movies'. Entity Framework EF Core exception "Unable to translate the given 'GroupBy' pattern" We would like to show you a description here but the site won’t allow us. Language language = context. To handle unique constraint violations: Catch uniqueness exceptions thrown by the database at the lowest level possible — in the UnitOfWork class. Oct 9, 2009 · Thank you Alex. Nov 28, 2022 · I am doing a many to many relationship with Entity Framework Core and I am encountering a problem with the primary keys. WorkingHours'. Where Each user is linked to one Role. This is very interesting. HasRequired<PricingPlan>(r=>r. net core 2. x, it is necessary to include an entity in the model to represent the join table, and then add navigation properties to either side of the many-to-many relations that point to the Feb 14, 2020 · It seems like EF Core is doing an INSERT instead of an UPDATE, and thus MySQL complains about a duplicate key. 0 and one . However, I am using the Update method on the DbSet and the entities do have primary keys set. 1 on PostgreSQL 13 failed with duplicate key value violates unique constraint while adding a row. Web/ migrations add ChangeShoppingCartItemKey dotnet ef --startup-project . The duplicate key value is (0). See Disconnected Entities. Configuring a primary key Feb 3, 2022 · An exception of type 'Microsoft. {. e the child's primary key copies its parent's primary key. This is called "identity resolution". Tip. THIRDTABLEID, t. In most cases these exceptions are coming from index violations. 1. DbUpdateException related to a primary key constraint violation on the Nazione entity. Use the UnitOfWork in the controller to explicitly commit pending changes and see if there are any uniqueness constraint violations. ---> Microsoft. This is known as the "join entity type" and maps to a "join table" in a relational database. Use DbUpdateConcurrencyException. PostgresException: 23505: duplicate key value violates unique constraint 1 Can't insert entity Entity framework duplicate key exception May 17, 2017 · I'm create a few related entities and attempting to save them. EF Core version: Microsoft. Even then, you still have to catch exceptions because of concurrency. FOURTHTABLEID }); Moreover I had also not because of this correctly defined the relationship as one key was missing. The duplicate key value is (1, 1). I've tried to catch this Unique exception by checking for the Number 2601 but am unable to access the Number property. However, if you are trying to insert data for each test into a DbContext are getting the IdentityConflict exception since the test records have the same ID (but reflect data specific to that test) then it is because your DbContext data source is living between the tests. Nov 8, 2020 · Let’s say that this is the exception you are getting when trying to insert a duplicate user email: Msg 2627, Level 14, State 1, Line 2 Violation of UNIQUE KEY constraint 'IX_User_Email'. It includes at least: DeleteBehavior. Sep 10, 2020 · Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand Jul 22, 2018 · Entity Framework Core: Npgsql. BlogPosts’ with unique index ‘IX_BlogPosts_PostName’. Dec 19, 2016 · Migrated to . Primary keys are defined in DbContext: Mar 30, 2023 · Many-to-many relationships are different from one-to-many and one-to-one relationships in that they cannot be represented in a simple way using just a foreign key. NET Core and EF Core. /SmartStoreNetCore. Here is a picture of the error: Not quite sure what else to try and catch the specific exception. OwnerId, e. When attaching e. \r\nThe statement has been terminated. If we try to update a row's name that exists in the table, ef core fires unique index exception (DbUpdateException) as expected. Accepted answer. Entity Framework Core supports composite keys - primary key values generated from two or more fields in the database. PricingPlans'. User'. My next challenge would be to abstract matching existing. Jan 12, 2023 · This means multiple instances of an entity with the same key value must be resolved to a single instance. I am pretty sure that ef core tries to add this Department to the database. Entries to prepare a new set of changes for the affected entities. 0 Operating system: Windows IDE: Rider. dll 3 db. PostgresException, which indicates a duplicate key value violation when saving orders. But when we try to insert a new row with a name that already exists, ef core fires DBConcurrency Exception. It works while in debug mode because in order to show properties of Student, debugger may end up calling the getter causing Course to be loaded. Detached Entities May 28, 2019 · If any of the entities I'm adding already exist in the database, in terms of a duplicate primary key, then obviously SaveChanges() throws an exception, and the entire transaction rolls back. Sql method. So the happy scenario will always be pretty quick. 3 May 23, 2022 · Entity Framework Core: Npgsql. Jan 5, 2024 · The instance of entity type 'Article' cannot be tracked because another instance with the same key value for {'ID'} is already being tracked. CommentBy as Unchanged, _context. UserProfiles). Nov 12, 2016 · If FolderID is the foreign key, EF concludes that there is a 1:1 association between a folder and its parent. Aug 17, 2016 · See the inner exception for details. EntityFrameworkCore 3. C#. 1 - Entity Framework: Check for duplicates before adding to DB 8 Ignore duplicate entries and commit successful ones on DbContext. Entity<UserProfile>(). Here the model classes: DbUpdateException(String, Exception) Initializes a new instance of the DbUpdateException class. Jul 16, 2017 · 4. NET 7. Cities' and the index name 'IX_Cities_CountryId'. But first some code of my config: Jul 21, 2019 · What you get is a DbUpdateException, its inner exception is an UpdateException and this exception's inner exception is a SqlException. Entity Framework Core: Violation of PRIMARY KEY constraint Cannot insert duplicate key in object. Copy. If you add an entity to a context which does not contains it yet then it will treat like a new entity. LanguageId == userCreateModel. workaround. I write next code for context table and columns configuration: public class CityConfiguration : IEntityTypeConfiguration<City>. Dec 6, 2018 · To avoid this behavior, you could mark the state of comment. IdentityUser'. 0 and ms sql server in our project. NET Core 1. EF Core - Add unique index. dll Apr 5, 2018 · Id: 1, Name: "Dog". OwnedId } To create new items, I use this code: var newItem = dbContext. SaveChanges() and Attach() and other orders, but I fail always with above exception. Inheritance. The duplicate key value is (A0 ). Oct 9, 2022 · If this still doesn't work then the next thing to check would be how the "Context" reference is being initialized. InnerException is null, so the switch statement never executes. Feb 22, 2019 · this tutorial based from on this article:Composite Keys. Jul 21, 2021 · Then when you go to create a User entity from your UserCreateModel your code would look something like this: using (var context = new AppDbContext()) {. Instead, an additional entity type is needed to "join" the two sides of the relationship. When I check the inserted data, I see that there is no other duplicate but one without accents: 'GUEN10'. I am switching to code first using EF Core with Zzz Projects Entity Framework Extensions. Entity; newItem. Creating a unique constraint is a very common approach to stop duplicate data from entering the database at the table level. Feb 20, 2018 · Actually this is considered as improvement in EF Core 2. 1. Dec 3, 2021 · See the inner exception for details. 0.