designing the data access layer

... Trang 1The Data Link LayerChapter 3 Trang 2Data Link Layer Design Issues• Services Provided to the Network Layer • Framing • Error Control • Flow Control Trang 3Functions of the Data Link Layer• ... before and after stuffing Trang 9Framing (3)Bit stuffing (a) The original data (b) The data as they appear on the line (c) The data as they are stored in receiver’s memory after destuffing Trang ... Data Link Protocols• HDLC – High-Level Data Link Control • The Data Link Layer in the Internet Trang 41High-Level Data Link ControlFrame format for bit-oriented protocols Trang 42High-Level Data

Ngày tải lên: 21/12/2017, 11:48

... 3Functions of the Data Link Layer• Provide service interface to the network layer • Dealing with transmission errors • Regulating data flow SinhVienZone.Com Trang 4Functions of the Data Link Layer (2)Relationship ... stuffing. SinhVienZone.Com Trang 9Framing (3)Bit stuffing (a) The original data. (b) The data as they appear on the line. (c) The data as they are stored in receiver’s memory after destuffing. SinhVienZone.Com ... Trang 1The Data Link LayerChapter 3 SinhVienZone.Com Trang 2Data Link Layer Design Issues• Services Provided to the Network Layer • Framing • Error Control • Flow

Ngày tải lên: 30/01/2020, 23:02

... Trang 1The Data Link LayerChapter 3 Trang 2Data Link Layer Design Issues• Services Provided to the Network Layer • Framing • Error Control • Flow Control Trang 3Functions of the Data Link Layer• ... before and after stuffing. Trang 9Framing (3)Bit stuffing (a) The original data. (b) The data as they appear on the line. (c) The data as they are stored in receiver’s memory after destuffing. Trang ... 39Petri Net Models (2)Trang 40Example Data Link Protocols• HDLC – High-Level Data Link Control • The Data Link Layer in the Internet Trang 41High-Level Data Link ControlFrame format for bit-oriented

Ngày tải lên: 14/12/2021, 07:14

... executed by the user in seconds The Benefits of Metadata FINRA tracks the metadata, from ETL to the user’s last interaction with the data Ultimately, that improves the user experience, says Donaldson, ... information about data to people.” If employees find a dataset that could be valuable for their work, they can request access from the same portal they use to browse and search datasets 6 | Self-Service ... provides data access to more people within the com‐ pany, and allows them to combine disparate sources of data and cre‐ ate their own customized analysis “It’s an approach to analytics that enables the

Ngày tải lên: 04/03/2019, 09:12

... the data access process as the data management services do in the back room. Data access services cover five major types of activities in the data warehouse: warehouse or metadata browsing; access ... formulation, the execution of the query on the database, and the return of the result set to the desktop These services arguably have the broadest impact on user interactions with the database The following ... for the data itself All of a sudden, the data seems like the simplest part In a sense, metadata is the DNA of the data warehouse It defines what all the elements are and how they work together.

Ngày tải lên: 03/02/2024, 23:34

... Open the POData.vbp project in the <install folder>\Labs\Lab07\POData folder 3 Open the code window for the db_Order class and examine the code in the Insert method 4 Note that the code ... the COM+ application uses a connection for database access The connection is closed and placed in the connection pool for this process Another object requires a database connection and uses the ... three properties that relate to the value of the field: This property represents the value of the field in the database on the server It is usually used when the recordset is reconnected and

Ngày tải lên: 21/12/2013, 19:15

... NETWORKING ACADEMY The Data Link layer provides a means for exchanging data over a common local media The Data Link layer performs two basic services: — Allows the upper layers to access the media ... Frames the Network layer packet = Identifies the Network layer protocol < 2 Data Link Layer PN MEDIA ACCESS CONTROL » Addresses the frame * Marks the beginning and ending ofthe frame — The ... by Data Link layer protocols e 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

Ngày tải lên: 22/12/2013, 13:17

... data in these objects based on the current value of a variable 1 With newsFlash4.fla open, select Frame 1 of the Actions layer Open the Actions panel and enter these variables at the end of the current ... contains one of these three values The second line of the script dynamically pulls that value from the weather array using the correct object and sends the icon_mc movie clip instance to the correct ... Click the M and T on the bottom-right of the screen to change the display Notice that the weather and date change The way we've coded this makes it easy to add day objects without changing the

Ngày tải lên: 21/01/2014, 13:20

... transition 1 to 0  Then samples next seven intervals (char length)  Then looks for next 1 to 0 for next char  Simple  Cheap  Overhead of 2 or 3 bits per char (~20%)  Good for data with large ... and up the other  Differential signaling  Value depends on direction of voltage  Tolerates more noise and generates less  (Unbalanced, e.g RS-232 uses single signal line and ground)  Data ... one station may transmit at a time Requires one data path Trang 10Traditional ConfigurationsTrang 11equipment, DTE) do not (usually) include data transmission facilities equipment (DCE)  e.g

Ngày tải lên: 16/02/2014, 08:20

... hydrogenases differ in their metal con-tent (FeFe, NiFe), their localization in the cell, their relationship with metabolism, and the way their synthe-sis is regulated [2] They catalyze the reversible ... (probably the HupU subunit) interacts with the N-terminal domain of the histidine kinase HupT to transduce the signal of H2 availability [13] We therefore addressed the question of whether the mutation ... pathways for gas access to the deeply buried active site [23–25] As both molecular H2 and O2 are hydrophobic gases, they probably use the same access pathway to the hydrogenase active site The amino-acid

Ngày tải lên: 20/02/2014, 01:20

... added by their corresponding layer at the sending end of the conversation as the data rises back up through the seven layers at the receiving side, acting on the transmitted content at their layer ... simply depend upon the best efforts of the lower layers to deliver the data, and the protocols of the upper layers to ensure success to the levels they require, such as with the UDP protocol Transport ... takes the higher layer requests to send data and organizes the initiation and cessation of communication with the far end host The session layer then presents its data flows to the transport layer

Ngày tải lên: 05/03/2014, 21:20

... the data in the form of a HTML table To help determine the most appropriate data access approach, consider whether you require the added flexibility of the (disconnected) DataSet object, or the ... uses the DataAdapter object to channel data to and from the DataSet and the underlying data source The DataAdapter object also provides enhanced batch update features previously associated with the ... on the next page shows the full DataSet object model. Trang 8DataRowDataTable Figure 1.1 DataSet object model Trang 9.NET Data ProvidersADO.NET relies on the services of NET data providers These

Ngày tải lên: 06/03/2014, 03:20

... IN THE DATA PROCESSING ENVIRONMENT - THE EVOLVING ROLE OF THE INTERNAL AUDITOR A Thesis Presented to The School of Business Quinnipiac College In Partial Fulfillment of the Requirements for the ... reliability and the reporting of the results of this examination with the expectation of increasing the usefulness of the information to the user" 2 Traditionally, the role of the Internal ... to the use of these data communication facilities The significant increase in the use of data communication facilities has been evidenced by the fact that "while in 1970, only 25 % of the

Ngày tải lên: 23/03/2014, 05:23

... so on, untilthey unlock it The group can also try them all at random if they like.Even if the group employs both strategies, the result will be the same in the long run If we record the number ... on theother hand, should not be able to anticipate what the next play will be If someone had the time before the play starts to analyze the terback’s calls, their contexts (the down, how well the ... significant changes.The first was a change in the algorithm’s S-boxes S-boxes are thepart of the algorithm that control how the data are permutated as theymove from step to step along the process of

Ngày tải lên: 25/03/2014, 11:08

... do When designing for the web, we’re often wrapped up in mechanics The nuts and bolts of the design process Browser capabilities, the content, the imagery, the HTML, CSS or Javascript – the stuff ... the audience to notice the use of the colour red and to draw their own conclusions as to its importance The film is just as enjoyable if the audience doesn’t notice, but it does add another layer ... via other platforms, such as the web Trang 30Invisible communication isn’t solely the responsibility of the designer To achieve the most effective invisible communication the other members of the

Ngày tải lên: 28/03/2014, 21:20

... distant from the money, whether they are in-the-money or out-of-the-money con-As a contract month approaches expiration, the gammas of both the the-money options, and the options near-the-money, ... because they contain the most time premium Those nearest the money, the 360s and the 400s, also have increased theta The far out-of-the-money and deep in-the-money options can have decreased theta, ... point Theta ($ per day) As we said in Chapter 3, all options lose their value at an accelerated rate as they approach expiration The at-the-money options, the 380s, have the most increase in theta

Ngày tải lên: 21/06/2014, 07:20

... 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

... 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

... from either the user interface or from other systems 388 Module 11: Designing the Presentation Layer Duality of the Presentation Layer Slide Objective To identify the composition of the presentation ... Module 11: Designing the Presentation Layer ! Application Presentation Layer Slide Objective To introduce the section " Purpose of the Presentation Layer " Duality of the Presentation Layer " Benefits ... functionality Data store The presentation layer has two parts, the user interface and the user services The user interface is how users interact with the system To users, the user interface often is the...

Ngày tải lên: 17/01/2014, 09:20