the data access layer

... the second of two modules that focus on the DAL: Module 8, The Nontransactional Data Access Layer and Module 9, The Transactional Data Access Layer. ” The DAL is an application’s means of access ... transactional DAL then processes the requests by delegating the requests to the data services layer The transactional DAL can return to the business logic layer either success or failure If the transaction ... CRM The first step in the operation of the CRM is the client component’s creation of the CRM Worker The client component then begins using the CRM Worker In the case of the XML CRM Worker, the...

Ngày tải lên: 05/11/2013, 12:15

... is the first of two modules that focus on the DAL: Module 8, The Nontransactional Data Access Layer and Module 9, The Transactional Data Access Layer. ” The DAL is an application’s means of access ... Introduction to the Data Access Layer The purpose of this section is to introduce students to the DAL and its main purpose, which is to buffer all other layers from the data services layer The section ... through the business logic layer The facades simply access whatever components they need in the DAL to accomplish their goals 4 Module 8: The Nontransactional Data Access Layer Splitting the DAL...

Ngày tải lên: 21/12/2013, 06:17

... the second of two modules that focus on the DAL: Module 8, The Nontransactional Data Access Layer and Module 9, The Transactional Data Access Layer. ” The DAL is an application’s means of access ... transactional DAL then processes the requests by delegating the requests to the data services layer The transactional DAL can return to the business logic layer either success or failure If the transaction ... CRM The first step in the operation of the CRM is the client component’s creation of the CRM Worker The client component then begins using the CRM Worker In the case of the XML CRM Worker, the...

Ngày tải lên: 17/01/2014, 09:20

... be returned The FindAll method, on the other hand, returns every user in the database without discrimination 172 CHAPTER ■ DATA ACCESS LAYER There is also a single method each for the remaining ... will perform the CRUD operations required by the clients of the model—most likely to be the ViewModel The objective of the DAL code is to protect the object schema from changes to the database schema ... corresponding table The database does not recognize that there is shared data between the different subclasses In Table 8–5, the User abstract class is ignored, and the two tables replicate the Name, EmailAddress,...

Ngày tải lên: 03/10/2013, 01:20

... of the other parameters, which was probably due to excess aerobic condition in the MSL systems shown in ORP values near 400 mV Open top of the MSL systems allowed air enter the inside of the ... T-N contents in soil mixture layers and zeolite layers at each depth of MSL1, and Depths were the distances from the top surface of zeolite layer - 102 - CONCLUSION The results of this study revealed ... diameter) was installed between the second and the third soil mixture layers Two porous pipes for inlet of river water were installed on the surface of zeolite layer Hydraulic loading rate was...

Ngày tải lên: 05/09/2013, 08:40

... cần khai báo đối tượng Database Chẳng hạn như: Dim Set db As db = Database OpenDatabase(" \ \baigiang.mdb") Cú pháp đầy đủ phương thức OpenDatabase: Set database = OpenDatabase (dbname, options, ... truy cập liệu theo ODBC) dbOptimisticBatch Cho phép cập nhật theo lô (chỉ cách truy cập liệu theo ODBC) Lưu ý: Xét ví dụ sau: Dim Dim Set Set db rs db rs As Database As Recordset = OpenDataBase (" ... đối tượng Database sau: Dim db As Database Đối tượng Database có nhiều phương thức, ta xét qua phương thức quan trọng cho phép ta thao tác với sở liệu II.1.1 Sử dụng phương thức OpenDatabase để...

Ngày tải lên: 30/09/2013, 06:20

... Background="White"> < /data: DataGrid> 10 Highlight the DataGrid definition in the solution and replace it with the following DataGrid definition, which is from the previous DataGrid ... NETWORKING ... /> < /data: DataGridTemplateColumn.CellTemplate> < /data: DataGridTemplateColumn>

Ngày tải lên: 05/10/2013, 03:20

... INTRODUCTION TO DATA ACCESS Listing 5-7 Saving the Registration of a New Player private NewsletterSubscriptionDataAccess subscriptionDataAccess; private MembershipDataAccess membershipDataAccess; public ... worse, the data- access operations that are called by the saveMembership RegistrationDetails() method can’t work in the same database transaction For data- access methods to operate in the same database ... TO DATA ACCESS Summary This chapter introduced you to some of the challenges of data access Data access is the single most influential factor for applications that build on top of databases The...

Ngày tải lên: 05/10/2013, 04:20

... bind the DataGridView to a DataTable The other is to bind the grid to a list of objects that have properties; the various properties will become the grid’s columns Binding to a DataSet is the ... These include the ListBox and CheckListBox classes Next, you’ll look at binding data to a more complicated control, the DataGridView class Data Binding and the DataGridView The DataGridView control, ... cause the SqlDataReader to be closed You must also close the corresponding SqlConnection object, which is done by linking the closing of the database connection to the closing of the SqlDataReader:...

Ngày tải lên: 05/10/2013, 10:20

... and therefore the slower the response Ensuring data integrity One of the biggest benefits an RDBMS provides is that it protects the integrity of the data Once you place data into a relational database ... through the JDBC driver The driver converts the SQL statements to a format the database server understands and makes the network call using the correct protocol The JDBC driver abstracts the database−specific ... overview of the major components 13 Chapter 2: A Relational Database Primer Understanding data storage The purpose of a database is to safely store data How it organizes the data on the physical...

Ngày tải lên: 10/12/2013, 02:15

... state in the back end The disadvantages are: The database resources required in storing state information The computing cost that is incurred by frequently moving data from the client to the database ... Because the ASP.NET session is stored externally from the worker process, the state data can be accessed by another worker process These worker processes could be running on another processor on the ... whether to hold the unit price of an item in the cart or retrieve this directly from the database when the user proceeds to the checkout Also, a decision needs to be made on whether to write the...

Ngày tải lên: 10/12/2013, 16:16

... when the call returns: The return value of the method call does not reflect the success or failure of the call on the server Therefore, there is no way to inform the caller about the result of the ... whether the purchase takes place immediately or at a later time when the supplier can supply the goods Each of these purchasing calculations forms part of the business logic of the application The ... of the component on the local system The local component records the method call made by the client application The local component sends a representation of the method call through MSMQ to the...

Ngày tải lên: 10/12/2013, 16:16

Ngày tải lên: 10/12/2013, 19:15

... System .Data – Để truy cập xử lý CSDL, sử dụng namespace System .Data, System .Data. Common, System .Data. OleDb, System .Data. SqlClient, System .Data. SqlTypes – Các lớp System .Data: DataSet, DataTable, DataRow, ... Mục lục ADO.NET Overview Using Database Connections Commands Quick Data Access: The Data Reader Working with DataSet Viewing NET data Example Data Access and Viewing with NET Editor: Đoàn ... data adapter – Tạo data set – Sử dụng phương thức Fill() data adapter Xây dựng cách thêm data table – Tạo DataSet – Tạo DataTable Khởi tạo data table cách thêm DataColumn Thêm dòng liệu vào data...

Ngày tải lên: 13/12/2013, 09:16

... DataSet, the column names used in the DataSet default to the column names defined in the data source A DataAdapter has a collection of DataTableMapping objects in its DataTableMappingCollection accessed ... submitting DataSet changes back to the data source In the solution, the Categories table retrieved by the query is mapped to a table in the DataSet called tblmapCategories with the following code: DataTableMapping ... property These objects map the name of a table in the data source to a DataTable with different name in the DataSet When a batch query is used to fill multiple tables within a DataSet, the table...

Ngày tải lên: 14/12/2013, 18:16

... and therefore the slower the response Ensuring data integrity One of the biggest benefits an RDBMS provides is that it protects the integrity of the data Once you place data into a relational database ... through the JDBC driver The driver converts the SQL statements to a format the database server understands and makes the network call using the correct protocol The JDBC driver abstracts the database−specific ... overview of the major components 13 Chapter 2: A Relational Database Primer Understanding data storage The purpose of a database is to safely store data How it organizes the data on the physical...

Ngày tải lên: 15/12/2013, 20:15

... which data access method best meets the needs of the scenario Write your answers below After completing the above steps, you will discuss your responses with the class The instructor will write the ... Identifying Data Access Requirements Exercise 1: Identifying a Data Access Method for a Scenario (10 minutes) ! Identify data access requirements Participate in small groups as assigned by the instructor ... by the instructor Validate the feasibility of the solution given in the scenario Make any comments in the space below After completing the above steps, you will discuss your responses with the...

Ngày tải lên: 21/12/2013, 06:16

... manipulate the contents of the opened file First, specify the type of data in the file by setting the Type property If the file contains text data, specify the character set of the data in the file ... Run the project to test it • Click the Get Records button to retrieve the data Then change the name of Product to Tea and click Update Database To confirm that the change has been made in the database, ... Basic Open the POData.vbp project in the \Labs\Lab07\POData folder Open the code window for the db_Order class and examine the code in the Insert method Note that the code uses...

Ngày tải lên: 21/12/2013, 19:15

... (CSMA/CA), the device examines the media for the presence of a data signal If the media is free, the device sends a notification across the media of its intent to use it The device then sends the data ... defined by Data Link layer protocols The Data Link layer "sees" the logical topology of a network when controlling data access to the media It is the logical topology that influences the type of ... (CSMA/CD), the device monitors the media for the presence of a data signal If a data signal is absent, indicating that the media is free, the device transmits the data If signals are then detected...

Ngày tải lên: 22/12/2013, 13:17

... on the right, enter the Name of the form as MyDataForm.cs, and click Open (see Figure 6.18) You'll then see the welcome page for the Data Form Wizard Figure 6.18: Adding a data form using the Data ... Choosing the data connection Click the Next button to continue You now log in to the database by specifying the password for the database user You used the sa user when creating the database ... creating a new DataSet Enter myDataSet as the name for your DataSet, as shown in Figure 6.19 Figure 6.19: Entering the name of the new DataSet Click the Next button to go to the next step You...

Ngày tải lên: 24/12/2013, 01:17