... (Conventional Memory) , Bộ nhớ mở rộng (Extended Memory) , Bộ nhớ bành trướng (Expanded Memory) , Vùng nhớ trên(Upper Memory Area), Vùng nhớ cao (High Memory Area) Bộ nhớ quy ước (Conventional Memory) : ... thời chuyển động xuyên qua lớp cách điện IX.Flash Memory Flash memory thật memory (chứa thông tin, đọc xoá được) điển hình cuả memory RAM Do flash memory gọi flash RAM Flash RAM khác loại RAM bình ... vào nghiêng khoảng 45 độ Thông thường loại 30 pins tải data 16bit, loại 72 pins tải data 32bit, loại 144 (cho notebook) hay 168 pins tải data 64bit RIMM: Là tên thương mại loại module nhớ Direct...
... 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, ... OpenDatabase để tạo đối tượng Database Ta dùng phương thức OpenDatabase phép đối tượng Database tham khảo đến sở liệu cụ thể, đối số bắt buộc phương thức chuỗi, kết trả đối tượng Database, trước sử dụng ... 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...
... success; } 173 CHAPTER ■ DATAACCESS LAYER private void DisconnectFromDatabase() { if (_databaseConnection.State != ConnectionState.Open) { _databaseConnection.Close(); } } private IDataReader ExecuteReadCommand(IDbCommand ... command) { IDataReader dataReader = null; if (_databaseConnection.State == ConnectionState.Open) { dataReader = command.ExecuteReader(); } return dataReader; } private User CreateUserFromReader(IDataReader ... repetition of database access code (see Listing 8–3) The NET Framework provides the ADO.NET services for accessing databases without tying code to a specific vendor The class will require a database...
... INTRODUCTION TO DATAACCESS Listing 5-7 Saving the Registration of a New Player private NewsletterSubscriptionDataAccess subscriptionDataAccess; private MembershipDataAccess membershipDataAccess; public ... java.sql.SQLException; public class NewsletterSubscriptionDataAccess { private DataSource dataSource; public void setDataSource(DataSource dataSource) { this.dataSource = dataSource; } public void addNewsletterSubscription(int ... NewsletterSubscriptionDataAccess subscriptionDataAccess; public void subscribeMemberToNewsletter(Member member, String email) throws MyDataAccessException { subscriptionDataAccess.addNewsletterSubscription(member.getId(),...
... 229 CHAPTER I DATAACCESS Class Description System .Data. Common.DbDataAdapter This class is used to fill a DataSet class with data from a relational database System .Data. DataSet An in -memory representation ... CHAPTER I DATAACCESS system .data windows system.webServer mscorlib system .data. oledb system .data. oracleclient system .data. sqlclient configProtectedData satelliteassemblies system .data. dataset ... Page 230 CHAPTER I DATAACCESS Table 9-3 Continued Namespace DLL Description Oracle.DataAccess Client Oracle.DataAccess Client.dll The Oracle data provider for NET (ODP.NET) is a database provider...
... same dataaccess technologies as that of the nontransactional DAL The following dataaccess technologies were covered in Module 8, “The Nontransactional DataAccess Layer”: ! Microsoft DataAccess ... modules that focus on the dataaccess layer (DAL) In Module 8, “The Nontransactional DataAccess Layer,” you learned about data retrieval In this module, you will learn about data manipulation After ... DAL: Module 8, “The Nontransactional DataAccess Layer” and Module 9, “The Transactional DataAccess Layer.” The DAL is an application’s means of access to data services After completing this...
... ResultSetMetaData objects 135 Using ResultSetMetaData objects 135 ResultSetMetaData example 136 The DatabaseMetaData Interface 140 Creating DatabaseMetaData ... Getting Started with Java DataAccess Chapter List Chapter 1: Introducing Java DataAccess Development Chapter 2: A Relational Database Primer Chapter 1: Introducing Java DataAccess Development In ... protect against data loss or corruption Relational databases are the most Chapter 1: Introducing Java DataAccess Development widely used database system • Hierarchical database — Stores data in records...
... 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, ... 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 ... Add data table vào data set cách thêm vào thuộc tính Tables data set DataAccess and Viewing with NET Editor: Đoàn Quang Minh Đoà 10 Working with DataSet – Example DataSet ds = new DataSet(); DataTable...
... ResultSetMetaData objects 135 Using ResultSetMetaData objects 135 ResultSetMetaData example 136 The DatabaseMetaData Interface 140 Creating DatabaseMetaData ... Getting Started with Java DataAccess Chapter List Chapter 1: Introducing Java DataAccess Development Chapter 2: A Relational Database Primer Chapter 1: Introducing Java DataAccess Development In ... protect against data loss or corruption Relational databases are the most Chapter 1: Introducing Java DataAccess Development widely used database system • Hierarchical database — Stores data in records...
... 74 Activity 9.4: Identifying DataAccess Requirements Exercise 1: Identifying a DataAccess Method for a Scenario (10 minutes) ! Identify dataaccess requirements Participate in small ... Scenarios A All data for a new order entry system is going to be stored in Microsoft® SQL Server™ and accessed by Microsoft Excel for querying and by the Web system for additional lookups All data is ... to be generated and copies to be stored in a repository for easy access in the future Solution A B Activity 9.4: Identifying DataAccess Requirements 75 Exercise 2: Analyzing Technology Selection...
... Business Logic Layer DataAccess Layer Transactional DAL Data Services Nontransactional DAL The data services store and manage all of the data used by the system Access to the data services requires ... layer (DAL): Module 8, “The Nontransactional DataAccess Layer” and Module 9, “The Transactional DataAccess Layer.” The DAL is an application's access to data services After completing this module, ... DAL: Module 8, “The Nontransactional DataAccess Layer” and Module 9, “The Transactional DataAccess Layer.” The DAL is an application’s means of access to data services After completing this...
... connect to a data source, retrieve selected data, and manipulate data ! Retrieving Data from a Database Explain that in an enterprise solution, it is critical that developers access databases efficiently ... know how to access relational data by using previous versions of ADO The module focuses on learning how to access databases efficiently in an enterprise solution and how to access Web data by using ... Commands Efficiently ! Accessing Web Data ! Lab 7.2: Accessing Data from a Web Site ! Best Practices ! In this module, you will learn how to use ADO 2.5 for Universal DataAccess You will learn...
... Exercise 1: Identifying DataAccess Considerations In this exercise, you will identify and group the factors to be considered for accessing data in a set of scenarios ! Identify dataaccess considerations ... Identify the data stores and list them in the first column of the following table For each data store, list the dataaccess considerations that have the greatest effect in determining a dataaccess ... appropriate dataaccess technologies for the scenario outlined in this activity, taking into account both the scenario details and the dataaccess considerations previously defined ! Identify data access...
... same dataaccess technologies as that of the nontransactional DAL The following dataaccess technologies were covered in Module 8, “The Nontransactional DataAccess Layer”: ! Microsoft DataAccess ... modules that focus on the dataaccess layer (DAL) In Module 8, “The Nontransactional DataAccess Layer,” you learned about data retrieval In this module, you will learn about data manipulation After ... DAL: Module 8, “The Nontransactional DataAccess Layer” and Module 9, “The Transactional DataAccess Layer.” The DAL is an application’s means of access to data services After completing this...
... OleDbDataAdapter OracleDataAdapter SqlDataAdapter ODBCDataAdapter OleDbDataReader OracleDataReader SqlDataReader ODBCDataReader OLE DB NET Data Provider Oracle NET Data Provider SQL Server NET Data ... Flexible Data Binding DataSet Batch Update SqlDataAdapter DataAccess Component Disconnected Retrieval and Presentation Scenario WebForm SqlDataReader DataAccess Component Figure 1.4 Multiple row data ... page shows the full DataSet object model 4 Microsoft DataSet DataRelationCollection ExtendedProperties DataTableCollection DataTable DataRowCollection DataView DataRow ChildRelations...
... information to construct a DataSource if you are using any other databases The datasource-beans.xml file shown below creates a DataSource for MySQL database:
... Overview of the New DataAccess Landscape The dataaccess landscape over the past seven or so years has changed dramatically Relational databases, the heart of storing and processing data in the enterprise ... alternative data stores that are being used in mission-critical enterprise applications These new data stores have been designed specifically to solve dataaccess problems that relational database ... benefits each NoSQL data store offers A graph database should be chosen to store highly interconnected data A document database should be used for tree and aggregate-like data structures A key/value...
... (Single Data Rate SDRAM), thường giới chuyên môn gọi tắt "SDR" Có 168 chân Được dùng máy vi tính cũ, bus speed chạy vận tốc với clock speed memory chip, lỗi thời o DDR SDRAM (Double Data Rate ... nâng cấp hệ thống máy tính SIMM (Single In-line Memory Module) DIMM (Dual In-line Memory Module) o SO-DIM: (Small Outline Dual In-line Memory Module): Thường sử dụng máy tính xách tay Tính ... hướng Một kênh nhớ RDRAM hỗ trợ đến 32 chip DRAM Mỗi chip ghép nối module gọi RIMM (Rambus Inline Memory Module) việc truyền liệu thực mạch điều khiển chip riêng biệt không truyền chip với Bus nhớ...
... System .Data. SqlClient.SqlDataAdapter sqlDataAdapter1; Có đối tượng định nghĩa cho lệnh SQL sqlDataAdapter Trong phương thức InitializeComponent(), trình thông minh tạo đoạn mã để tạo lệnh data ... System .Data. SqlClient.SqlCommand sqlSelectCommand1; private System .Data. SqlClient.SqlCommand sqlInsertCommand1; private System .Data. SqlClient.SqlCommand sqlUpdateCommand1; private System .Data. SqlClient.SqlCommand ... Generate DataSet… cho phép bạn chọn tên cho đối tượng DataSet Nếu bạn kéo vài bảng từ Server Explorer lên form bạn liên kết chúng với từ hộp dialog vào DataSet đơn Những tạo lược đồ XSD, định nghĩa DataSet...