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respectively.
In addition, however, the author needs to emphasize that Data Access logic
The key features are not in the first two layers (DAF is a bit different, and the first two layers are very important),
But in the real implementation of the specific data Access logic 3rd
Transactional Operations with database links var db = connectionhelper.getconn (connectiontype.write);//Get context var conn = db. connection;//Remove the database link Conn. Open ();//Turn on link using (var trans = Conn. BeginTransaction ()) Open transaction {Servicestationentities db = null;db = new Servicestationentities ((entityconnection) conn);Then do it. Trans.commit (); }
!
Whatever technology is used, this is always the most crucial step: at least, the author thinks so.
After the adoption of DAF solution, in fact, the specific use of what data access logic technology is not necessary special care, as long as the interface to determine, even a lot of historical problems can be easily resolved!
Ø Access Technology arbitrar
= "Accountcontext", the value of the database connection name is consistent with the previous context-dependent database connection name. 1 2 "accountcontext" connectionstring="Data source=.; Database=mvcdemo;uid=sa;pwd=sunfast; " providername="System.Data.SqlClient"/>
3 4. Run the project, the database will be created automatically, the database file is placed by default in SQL Server installation directory, the database will create more than
A long time ago, after publishing an article titled design of the persistent data layer framework (I), many people are paying attention to it. Now, a slightly complete test version of release has been released to provide the DLL, see the configuration instructions. You are welcome to experience and provide valuable suggestions.
The following is an
Access | Data L Introduction
Since. NET really went into the developer's Day, "efficiency" two words has been a topic that many programmers relish. Whether it's from development mode (Cross Language), the system framework (. NET framework), or a variety of easy-to-use tools (vs.net), none of this reflects its victory.
Before you learn this, take a look at the DataTable data shown in the MVC application http://www.cnblogs.com/insus/p/3361182.html, which shows the DataTable on the MVC view.Insus.net now uses the non-Entity Framework to display data on the view view. Just modify it on the basis of it.First remove the following class fr
record and see person = = = = (Context = stored in the database is 1, not what we want 12345678. What is this for? Because the primary key is SocialSecurityNumber is the int type, Code first does the self-growth processing of the column in the database. At this point, we would like to insert a custom socialsecuritynumber. So when we want to do this, we should configure the SocialSecurityNumber self-growth to none. SocialSecurityNumber {;FirstName {; LastName {; If the attribute is identifi
repeatedly stressed that the bottleneck is not in the database interaction stage. To avoid repeated meaningless comments, you may need to use Profiler to track the problem.
I have long heard that EF has a poor performance. I didn't expect it to be really bad, and it's not so bad, bloggers who do not know the truth are calm ). Those who have applied EF in the project should be careful when there is a picture and a truth!
1. NET4.0, EF4.4
1 public void ExecRealTimeRun (List
Simple. There is redu
12345678. What is this for? Because the primary key is SocialSecurityNumber is the int type, Code first does the self-growth processing of the column in the database. At this point, we would like to insert a custom socialsecuritynumber. So when we want to do this, we should configure the SocialSecurityNumber self-growth to none. public class person
{
[Key, Databasegenerated (databasegeneratedoption.none)] public
int SocialSecurityNumber {get; set;}
public string Firs
Summary
The design of the data access layer depends largely on the needs of stakeholders. For example, should the data access layer persist the object model or a set of simple values? S
believe that you have already been able to reflection, envelope can easily take off (but, the author still want to remind a: do not abuse! Protected design Intent is very clear, cautious of the L)!
Said so much, or a sentence: quickly use DAF Bar, it (also) will make you happy
The J!
However, there is one question that needs to be made clear to everyone: Why does the author not
Use factory pattern to construct different data
Developed by vs2005 + VB.net + Oracle + ado.netProgram, An error occurs on a customer's machine:
. NET Framework data providers require Microsoft Data Access Components (MDAC ). Install Microsoft Data Access Components (MDAC)
Step 3: add parameterization method to the data access layer
So far, ProductsTableAdapter has only one method, GetProducts (), which returns all products in the database. Operations on all products are useful, but we often want to obtain information about a specific product or all products under a specific category. To add such a feature to our
Return to the "ASP.net 2.0 Data Tutorial directory"
Introduction
As Web developers, our lives revolve around data manipulation. We build databases to store data, write code to access and modify data, and design Web pages to collect and summarize
Suppose dal uses php as an example. I used to use php to operate mysql separately. Now I need to squeeze the server and consider adding a redis instance. However, I am confused about the access policies of the two data sources. I hope to help me sort it out. It is better to explain it with pseudo code. Thank you. Suppose dal uses php as an
Access to | data other
To end the Ado.net analysis, we had to mention DataReader and the dataset between the brothers
of contention.
In the light of the information that the author has read, almost all of them suggest a concrete analysis of the actual situation, leaving
Very few are determined by personal habits.
In the study of Ado.net, the author is also holding the idea, and repeatedly remember the
Suppose the DAL uses PHP for example.
Originally using PHP alone to operate MySQL, now need to press the server, consider adding a redis, but at the same time facing the two data source access strategy generated doubts, hope to help comb.
It's better to explain it in pseudo-code, thank you.
Reply content:
Suppose the DAL uses PHP for
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