Entity framework get all records by id

Author: nrss

August undefined, 2024

WebOct 10, 2024 · Entity Framework Core Reads Record from the database through the DbContext object. For example we can get all records from the database by using the … WebJul 14, 2024 · That's because you're mixing and matching repository-based queries and LINQ queries. Rather than doing a true join, you're fetching all the rows for each table and then joining them in-memory.. The easiest way to fix this is probably to just return IQueryable rather than IEnumerable from your GetAll method. Using …

Get single row using Entity Framework without getting all data

WebOct 14, 2024 · Lazy loading can be turned off for all entities in the context by setting a flag on the Configuration property. For example: C#. public class BloggingContext : DbContext { public BloggingContext() { this.Configuration.LazyLoadingEnabled = false; } } Loading of related entities can still be achieved using eager loading (see Eagerly Loading above ... WebMar 11, 2024 · Entity Framework Core uses Language-Integrated Query (LINQ) to query data from the database. LINQ allows you to use C# (or your .NET language of choice) to … tatiana badiu

Querying and Finding Entities - EF6 Microsoft Learn

WebApr 10, 2024 · 1. First, create a ViewModel class and define the properties you want to show on the list. The ViewModel will provide just the data you need, not the entire entity. For sample: public class DeviceViewModel { public int Id { get; set; } public string Name { get; set; } public int DeviceCount { get; set; } } WebJul 14, 2024 · But this doesn't scale well, because it selects all entries before deleting, which could take a long, long time with Entity Framework. Iterating through each record and removing them individually with Remove(record) has the same problem. Using SQL this is simple, using a TRUNCATE command. WebMay 30, 2013 · Solution with .Where and .Contains has complexity of O(N square). Simple .Join should have a lot better performance (close to O(N) due to hashing). tatiana badilla

c# - LINQ select from table where fieldValue is in another tables …

Update Multiple Rows in Entity Framework from a list of ids

WebJul 18, 2016 · We had the same problem in our system with Entity Framework dealing with views. Try using ROW_NUMBER () OVER () SQL to create a column with unique values , but did not work. We need to insert a field more, an FK for another table in the view so that it could add as an additional training for mebro EntityKeyMembers Elimite and so the … WebOct 7, 2016 · For example first I select all values which matches this search parameter. IQueryable listOfvalues = from b in dbContext.Table2 where b.Field1.Contains (searchParam) select b; result = listOfvalues.ToList (); And now I need to write code which returns all fields from Table1 where Field is in that listOfValues. c#. linq. entity … 3g 解像度WebDec 15, 2015 · This line will not actually execute anything on the database: context.tbl1.Where(obj => obj.name == "Robin Banks") It will return an IEnumerable which is going to be lazily evaluated when you come to use it. To execute an actual query on the database you need to perform an enumeration on the IEnumerable (e.g. a … tatiana badaró

"WebJun 10, 2024 · here I am getting the type of the entity to get the navigation properties, then adding the name of each one to a list of string, then aggregating over the list to include each entity. then we can use this extension method like this: var record= await _context.Products.IncludeAllEntities(_context).FirstOrDefaultAsync(x => x.Id == key); " - Entity framework get all records by id

Entity framework get all records by id

Entity Framework Core Get All Inserted Entity Ids

WebMay 31, 2015 · In the website when user clicks a category, then i want to find all the items having that category as foreign key from entity framework database. I came across method of Find () but it doesn't fulfill my requirement. What I want is something like. Database1Entities.Categories.Select (x => x.Cat_Id == Id); But I dont know the exact … WebSep 23, 2013 · I want to create a datagrid which contains all the records with then same name. I have this table: Shop ID name adress city ----- 1 name1 adress 1 city1 2 name 2 adress2 city2 3 name 2 4 name 2 city2 5 …

Did you know?

Web2 days ago · As mentioned, the IDs are only generated once the SaveChanges() is called. Fortunately, EF will populate the IDs in the entity object references when they are inserted, so the solution is to keep the entity references and get the IDs after saving. If you are recording the original list item's ID as part of the new entity this is quite simple: WebMay 23, 2024 · See this question/answer: Entity Framework: Get all rows from the table for the ids in list. Now my question: I would like to get the entities sorted as they are in the list of id's. I would be dealing with a small list, and don't mind if it's sorted in memory after pulling list from db. linq; entity-framework; Share. Improve this question.

WebEF Core Query. Data querying in EF Core is performed against the DbSet properties of the DbContext. The DbSet represents a collection of entities of a specific type - the type specified by the type parameter. Queries are specified using Language Integrated Query (LINQ), a component in the .NET Framework that provides query capability against ...

WebJan 12, 2024 · Tracking, no-tracking and identity resolution. Using SQL queries. Asynchronous programming. Additional resources. Querying efficiently is a vast subject, that covers subjects as wide-ranging as indexes, related entity loading strategies, and many others. This section details some common themes for making your queries faster, and … WebJun 5, 2012 · Here is a few ways to do it (Just assume I'm using Dependency Injection for the DbConext) public class Example { private readonly DbContext Context; public Example(DbContext context) { Context = context; } public DbSetSampleOne[] DbSamples { get; set; } public void ExampleMethod DoSomething() { // Example 1: This will select …

WebThere is a massive difference in the example you have posted, the first version: var urls = await context.Urls.ToListAsync(); This is bad, it basically does select * from table, returns all results into memory and then applies the where against that in memory collection rather than doing select * from table where... against the database.. The second method will not …

WebJan 26, 2012 · To not have an exception (expensive), but rather null "object". You can use Single or First methods. The difference between those methods is that Single expects a single row and throws an exception if it doesn't have a single row. Single and SingleOrDefault are actually supported at the top of the query since EF 4.0. tatiana badraWebOct 22, 2016 · writing-recursive-cte-using-entity-framework-fluent-syntax-or-inline-syntax converting-sql-statement-that-contains-with-cte-to-linq. I think there is no way to write a single LINQ to SQL query that could get all However, LINQ supports a method to execute a query (strangly enough called DataContext.ExecuteQuery). 3h変更管理WebJun 30, 2014 · You can build the same query in LINQ using those ground rules. Here are the simple steps to follow. 1) Get the list of permissions from UserPermissions table 2) Foreach permission, recurse the tree to find … tatiana badureauWebJun 17, 2024 · 3 Answers. Sorted by: 57. Set () is already IQueryable and it returns all rows from table. public IQueryable GetCompanies () { return … 3g路由器WebFeb 6, 2014 · The IQueryable.ToQueryString method introduced in Entity Framework Core 5.0 may help with this scenario, if you are willing to have some raw SQL appearing in your code. This method will generate SQL that can be included in a raw SQL query to perform a bulk update of records identified by that query. For example: tatiana barkovaWebJun 24, 2016 · EDIT: Thanks, all. I've moved the DB from a private attached so I can run profiling; this helps but causes confusions I didn't expect. And my real data is a bit deeper, I'll use Trucks carrying Pallets of Cases of Items-- and I don't want the Truck to leave unless there is at least one Item in it.. My attempts are shown below. 3hfw6 取扱説明書WebJul 4, 2024 · Just make the unique column of your table as identity column (or add on ID column in table and make it identity) and insert a row in table. for example: var cust = new Customer (); context.Customers.Add (cust); context.SaveChanges (); // generates Id for customer string nwBran = cust.Id; // now you can get the Id (identity) of inserted object ... 3h活動事例