entity framework profiler

The purpose of this tutorial is to explain how to use the Microsoft Entity Framework to create a data access class when you create an ASP. NET MVC application. This tutorial assumes that you have no prior knowledge of the Microsoft Entity Framework. After reading this tutorial, you will understand how to use the

ASP. NET MVC model (Create model class using Entity Framework)-Part.1The purpose of this tutorial is to explain how to use the Microsoft Entity Framework to create a data access class when you create an ASP. NET MVC application. This tutorial assumes that you have no prior knowledge of the Microsoft

The purpose of this tutorial is to explain how to use the Microsoft Entity Framework to create a data access class when you create an ASP. NET MVC application. This tutorial assumes that you have no prior knowledge of the Microsoft Entity Framework. After reading this tutorial, you will understand how to use the

using(TextWriter writer =NewStreamWriter ("Db.log",true) {writer. WriteLine (msg); } } }View Code Public Partial classEfcontextwhereT:class { PublicEfcontext ():Base("name=myconnectionstring") { } protected Override voidonmodelcreating (Dbmodelbuilder modelBuilder) {Database.setinitializerNULL); //Database.Log = Log = File.appendalltext ("Ef.log", String. Format ("{0}{1}{2}", DateTime.Now, Environment.NewLine, log));Dbintercepti

database is less than the length of the new data you inserted. But know the reason, to know exactly which field length is out of range is more difficult, the EF information is not clear, of course, if the database of fewer fields, you can quickly filter out, but if the table in the field is very much, that would be troublesome. This time we can use SQL Server's own SQL Server Profiler tool (the Express version does not have this tool). Suppose I have

, generating one SQL at a time, as follows:This omission describes three of these sql,sql statements similar, just read the role attribute when the information is obtained according to different Roleid, so only the parameter values are differentFrom the above example can be seen in the loop several times in order to get the navigation properties generated a few SQL, if the database table has a large amount of data, such a way to the performance of the impact can be imagined. According to the abo

. NET development when it comes to manipulating databases, especially when accessing SQL Server databases, it's often necessary to use some ORM frameworks, the most commonly used, and the most powerful ones to count EF. When using EF for database-related development, there are typically two modes involved: 1,db First;2,code first. Compared to the former, Code first is more flexible and suitable for agile development, especially when the database table structure is constantly changing. When using

If the user table and the permission table are many-to-many, where the annotation configuration in the user table:Permissions@ManyToMany (cascade = cascadetype.all, fetch = Fetchtype.eager)@JoinTable (name = "User_permission", Joincolumns = @JoinColumn (name = "user_id"), Inversejoincolumns = @JoinColumn (name = "permission_id"))Public listAnnotation configuration in the permissions table:User@ManyToMany (cascade = cascadetype.all, Mappedby = "Permissionlist", Fetch = Fetchtype.lazy)Public listW

1. Installing the Entity FrameworkUse NuGet to install the Entity Framework Package: tools, library Package Manager, and Package Manager console, execute the following statement:Pm> Install-package EntityFramework2. Entity Framework Database Connection ConfigurationAfter the

This essay list:1. Foreign key Column name default convention2, one-to-many relationship3. One-to-one relationship4. Many-to-many relationships5. A one-to-many reflexive relationship6. Many-to-many reflexive relationshipsIn a relational database, it is not always the case that all the tables exist separately, but they are related to each other. There can be a foreign key dependency between two different tables, and a table can have a reflexive relationship (a field in the table refers to a prima

This essay list:1. Foreign key Column name default convention2, one-to-many relationship3. One-to-one relationship4. Many-to-many relationships5. A one-to-many reflexive relationship6. Many-to-many reflexive relationshipsIn a relational database, it is not always the case that all the tables exist separately, but they are related to each other. There can be a foreign key dependency between two different tables, and a table can have a reflexive relationship (a field in the table refers to a prima

The DATABASEFIRST:EF framework automatically generates data layers and model based on the database. Project--Add--New item--Data--ado.net Entity Data Model--build from database--New connection--Select server name, database--[Yes, include sensitive data in connection string]--Select datasheet, view in database, Stored procedure--complete--Overwrite web.config Using System; Using System.Collections.Generic;

out in memory immediately thereafter.If you want your code to generate LINQ to SQL as much as possible, it's a simple rule to use LINQ, lambda expressions as much as possible so that EF can help us translate. There are two kinds of count in C #. Enumerable.count () is a method, List.count is a property. Once a thing becomes a list, you go to count, it must be in memory.So, in EF, to do count, this should be the case:Context. Post.count (p = p.categories.any (q = q.name = = CategoryName));At thi

method has a async version. Here is an example of a application service method that uses an asynchronous model: public class Personappservice:abpwpfdemoappservicebase, Ipersonappservice { private readonly irepository The Getallpeople method is asynchronous and uses getalllistasync and await to preserve the keyword. Async is not available in every ORM framework. The above example is the asynchronous capability provided from the EF. I

much as possible, there is a very simple principle, that is, try to use the LINQ and lambda expressions so that EF can help us translate. There are two types of count in C. Enumerable. Count () is a method, and list. Count is an attribute. Once a thing becomes a list, you can count it again, and it must be in the memory. Therefore, in EF, to perform the Count operation, write as follows: context.Post.Count(p => p.Categories.Any(q => q.Name == categoryName)); In this case, count () accepts a Lam

ADO. NET Entity Framework is Microsoft with ADO. the object relationship correspondence (O/R Mapping) solution developed Based on. NET, known as objectspace, is now included in Visual Studio 2008 Service Pack 1 and.. NET Framework 3.5 Service Pack 1. Directory Introduction Entity

Label:3-2 updating using native SQL statementsProblem 　　You want to update the underlying data store by using native SQL statements in the Entity Framework. Solution Solutions Suppose you have a payment database table shown in 3-2, using the Entity Framework Designer tool to create a model that is shown in 3-2. Figure

From Zhang Ziyang http://www.cnblogs.com/JimmyZhang/archive/2009/05/18/1459326.html The purpose of this tutorial is to explain how to create an ASP. net mvc application.ProgramHow to use Microsoft Entity Framework to create a data entity class. This tutorial assumes that you have no knowledge of Microsoft Entity

Framework generates the preceding SQL statement (a standard INNER JOIN query), but does not hand it over to the database. At the same time, we use SQL Server Profiler to monitor every action of the Entity Framework, to see if there is a black screen... Hey hey, catch it, Entity