For us was important a possibility to chain other LINQ operators to theWherecondition....
没有Id,搜索public "{TableName}Id"作为主键,默认为int形主键设置标记列自增;*/info: Microsoft.EntityFrameworkCore.Database.Command[20100] Executing DbCommand [Parameters=[], CommandType='Text', CommandTimeout='30'] CREATE TABLE [Categories] ( [Id]intNOT NULL IDENTITY, [CategoryID]intNOT NULL, ...
② EFCore的批量操作能力,由对应的DataBaseProvider支撑(Provider实现过程跟背后的存储载体密切相关);关注SQL存储过程sp_executesql,官方明文显示批量操作的列值参数最多2100个,这个关键因素决定了在大批量操作的时候 依旧会被分块传输。 ③ 另外一个批量操作的方法,这里也点一下:构造Rawsql 【EFCore也支持Rawsql】 ...
The one exception to this is PostgreSQL, which fully supports the concept of arrays: you can have an int array column in a table, query into it, and send an array as a parameter, just like you can with any other database type. This allows the EF PostgreSQL provider to perform the fol...
For EF Core 8, the default is now to pass the list of terrains as a single parameter containing a JSON collection. For example:none Copy @__terrains_0='[1,5,4]' The query then uses OpenJson on SQL Server:SQL Copy SELECT [w].[Name] FROM [Walks] AS [w] WHERE EXISTS ( ...
EF Core also supports mapping to a table-valued function using a user-defined CLR method returning anIQueryableof entity types, allowing EF Core to map TVFs with parameters. The process is similar to mapping a scalar user-defined function to a SQL function: we need a TVF in the database...
This is the same query but using string interpolation syntax, which is supported in EF Core 2.0 and above: varuser ="johndoe";varblogs =context.Blogs .FromSql($"EXECUTE dbo.GetMostPopularBlogsForUser {user}") .ToList(); You can also construct a DbParameter and supply it as a paramete...
Today, the Entity Framework Core team announces the eighth and final preview release of EF Core 5.0. The next release will be a release candidate (RC). This release includes table-per-type (TPT) mapping, table-valued functions, SQLite table rebuilds for migrations and much more. Copy _/\...
You can compose on top of the initial SQL query using LINQ operators; EF Core will treat your SQL as a subquery and compose over it in the database. The following example uses a SQL query that selects from a Table-Valued Function (TVF). And then composes on it using LINQ to do fil...
The table below describes the attributes that can be applied to the Parameter element.Expand table Attribute NameIs RequiredValue Name Yes The name of the parameter. Type Yes The parameter type. Mode No In, Out, or InOut depending on whether the parameter is an input, output, or input/...