Get all records from table entity framework
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 … WebJun 17, 2024 · The normal way to do this is by instantiating your dbContext. public IQueryable GetCompanies () { using (var context = new MyContext ()) { return context.Companies; } } There are lots of good tutorials on using CodeFirst Entity …
Get all records from table entity framework
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WebOct 14, 2024 · The Find method on DbSet uses the primary key value to attempt to find an entity tracked by the context. If the entity is not found in the context then a query will be … WebJul 18, 2024 · am not getting collection of students records in the object, if there are two matching records in students table for one teacher record, its returning 2 records. Am expecting test.cs should have { id, text, Students count 2} – PRK Jul 17, 2024 at 23:18 Looks like you'd need a "group by" to do what you're wanting. – Eric Smith Jul 18, 2024 …
WebMay 13, 2016 · It seems to return all the seats from the seats table. public static List GetSeatsForReservation (Guid reservationId) { using (var db = new EntityContext ()) { return db.Seats.Where (s => db.ReservationSeat .Select (rs => rs.ReservationId) .Contains (reservationId)).ToList (); } } c# sql-server entity-framework linq entity-framework-6 WebJan 12, 2024 · In relational databases, all related entities are loaded by introducing JOINs in single query. SQL SELECT [b]. [BlogId], [b]. [OwnerId], [b]. [Rating], [b]. [Url], [p]. [PostId], [p]. [AuthorId], [p]. [BlogId], [p]. [Content], [p]. [Rating], [p]. [Title] FROM [Blogs] AS [b] LEFT JOIN [Post] AS [p] ON [b]. [BlogId] = [p]. [BlogId] ORDER BY [b].
WebOct 11, 2013 · EF can cache objects locally within DataContext (and track all changes made to entities), but as long as you follow the rule to keep context open only when needed, it won't be a problem. 2. For simple edit I have to pull the record edit it and then push to db using SaveChanges () WebApr 11, 2011 · Depending on your database it might look something like this (if you're connecting users with roles through a table called 'UserRoles') var roles = db.UserRoles.Where (x => x.UserID == ).Select (x => x.Role) (Of course you could also create a stored procedure returning a list of 'Role' if you like directly in your db …
WebDec 17, 2024 · Entity framework knows the one-to-many relationship and recognizes that a group-join is needed for this. One of the slower parts of your query is the transfer of the selected data from the DBMS to your local process. Hence it is wise to limit the selected data to the data you actually plan to use.
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 … how to replace a list in pythonhow to replace a light fixture on a ceilingWebJun 24, 2016 · IQueryable records = db.AuctionRecord; var count = records.Count(); Make sure the variable is defined as IQueryable then when you use Count() method, EF will execute something like . select count(*) from ... Otherwise, if the records is defined as IEnumerable, the sql generated will query the entire table and … how to replace a light fixture on the wallWebFeb 1, 2024 · Here is the code. public async Task> GetUniqueRecordsByDate (int bId) { var rowsToReturn = await _context.Records .Where (b => b.SId == bId) .Select (d => d.Date) .Distinct () .OrderBy (d => d) .ToListAsync (); return rowsToReturn; } I'm trying to apply the above code but I get this error how to replace a lifeproof vinyl plankWebOct 14, 2024 · The Find method on DbSet uses the primary key value to attempt to find an entity tracked by the context. If the entity is not found in the context then a query will be sent to the database to find the entity there. Null is returned if the entity is not found in the context or in the database. north and south book summaryWebJun 10, 2024 · You can access a property getter through reflection like so: var enumerable = typeof ( [ClassNameOfContext]).GetProperty (name).GetValue (ctx, null); Whereas [ClassNameOfContext] is the name of the class that ctx is an instance of. This is not obvious from your code, but you know it :-) north and south buildersWebJan 27, 2024 · What I want to do is to pass table name and Id to get the value. I have created a common method as. public string GetClientValue (string id, string tableName) { DatabaseContext dbContext = new DatabaseContext (); //Query the database and get value based on table and id. string value = dbContent. ("query here") return value ; } how to replace a light fixture socket