Starting with EF Core 3.0, use FromSqlRaw, ExecuteSqlRaw, and ExecuteSqlRawAsync to create a parameterized query where the parameters are passed separately from the query string. For example:C# Copy context.Products.FromSqlRaw( "SELECT * FROM Products WHERE Name = {0}", product.Name); ...
When executing this query, EF Core will extract the values of the tenantId, userId, and sessionId parameters, and pass them to the Azure Cosmos DB query API as the partition key value. For example, see the logs from executing the query above:Output Копирај ...
初次之外 EF Core中还支持 FromSql,ExecuteSqlCommand 连个方法,用于更方便的执行Sql语句。 另外,目前版本的EF Core 不支持SqlQuery,但是我们可以自己扩展一个。坐等升级以后支持吧。 1.FromSql,执行列表查询 publicstaticIQueryable<TEntity>FromSql<TEntity>([NotNullAttribute]thisIQueryable<TEntity>source,[NotPa...
When the Contains operator is used with a subquery, EF Core now generates better queries using SQLINinstead ofEXISTS; aside from producing more readable SQL, in some cases this can result in dramatically faster queries. For example, consider the following LINQ query: Copy varblogsWithPosts =awai...
Currently, EF Core is not parameterizing IN(...) queries created from .Contains() (and maybe other cases). This has a very detrimental impact on SQL Server itself because: The query hash is different for each distinct set of IDs passed i...
The type used for query results can contain common mapping constructs supported by EF Core, such as parameterized constructors and mapping attributes. For example: Copy public class BlogPost { public BlogPost(string blogTitle, string content, DateOnly publishedOn) { BlogTitle = blogTitle; Content...
Core.Query.Internal.QueryCompiler.<>c__DisplayClass11_0`1.<ExecuteCore>b__0() at Microsoft.EntityFrameworkCore.Query.Internal.CompiledQueryCache.GetOrAddQuery[TResult](Object cacheKey, Func`1 compiler) at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.ExecuteCore[TResult](Expression query...
EF Core'smetricsreport the Query Cache Hit Rate. In a normal application, this metric reaches 100% soon after program startup, once most queries have executed at least once. If this metric remains stable below 100%, that is an indication that your application may be doing something which de...
另外,目前版本的EF Core 不支持SqlQuery,但是我们可以自己扩展一个。坐等升级以后支持吧。 1.FromSql,执行列表查询 public static IQueryable<TEntity> FromSql<TEntity>([NotNullAttribute] this IQueryable<TEntity> source, [NotParameterized] RawSqlString sql, ...
另外,目前版本的EF Core 不支持SqlQuery,但是我们可以自己扩展一个。坐等升级以后支持吧。 1.FromSql,执行列表查询 public static IQueryable<TEntity>FromSql<TEntity>([NotNullAttribute] this IQueryable<TEntity> source, [NotParameterized] RawSqlString sql, ...