Data Access
CÁC ĐỐI TƯỢNG TRUY CẬP DỮ LIỆU (DATA ACCESS OB
... OpenDatabase: Set database = OpenDatabase (dbname, options, read-only, connect) Ý nghĩa các tham số của phương thức OpenDatabase như sau: Thành phần Ý nghĩa database Biến kiểu đối tượng Database ... cần thông qua đối tượng đầu tiên đó là đối tượng Database. Trước tiên ta khai báo một đối tượng Database như sau: Dim db As Database Đối tượng Database có rất nhiều phương thức, ta sẽ chỉ xét ......
Data Access Layer
... } CHAPTER 8 ■ DATA ACCESS LAYER 174 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 Use...
Data Access and Networking
... ■ DATA ACCESS AND NETWORKING
147
< ;data: DataGrid x:Name="grdData" Margin="15" AutoGenerateColumns="False">
< ;data: DataGrid.Columns>
< ;data: DataGridTemplateColumn ... Grid.Column="1" />
</Grid>
</DataTemplate>
< /data: DataGridTemplateColumn.CellTemplate>
< /data: DataGridTemplateColumn>...
Introduction to Data Access
... 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 {
subscr...
Data Access
... 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 of a database that can
contain ... System.Windows.Forms
open Microsoft.Practices.EnterpriseLibrary .Data
let database = DatabaseFactory.CreateDatabase()
let dataSet = database.ExecuteDataSet
(CommandType.Text,
&quo...
Module 9: The Transactional Data Access Layer
... modules that focus on the data access layer
(DAL). In Module 8, “The Nontransactional Data Access Layer,” you learned
about data retrieval. In this module, you will learn about data manipulation. ... Transactional Data Access Layer
Distributed Transactions
MS DTC
MS DTC
UPDATE UPDATE
For complex transactions that involve data modifications on multiple rows in
mu...
Tài liệu java Data Access JDBC, JNDI, and JAXP pptx
... Sets
89
Creating DatabaseMetaData objects
A Connection object represents a database connection and also instantiates a DatabaseMetaData object with
the getMetaData() method. The DatabaseMetaData object ... DriverManager.getConnection(jdbcUrl,user,pwd);
//Initialize a DatabaseMetaData object
DatabaseMetaData dmd = conn.getMetaData();
//Retrieve database name and version
String dbname = dmd...
Tài liệu Bài 6: Data Access and Viewingwith .NET docx
...
System .Data. SqlTypes
System .Data. SqlTypes
.
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System .Data
System .Data
:
:
DataSet
DataSet
,
,
DataTable
DataTable
,
,
DataRow
DataRow
,
,
DataColumn
DataColumn
,
,
DataRelation
DataRelation
, Constraint
, Constraint
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: ... Overview
Using Database Connections
Using...
Tài liệu Java Data Access—JDBC, JNDI, and JAXP ppt
... 359
Transactions 359
Metadata 360
vi
Does not reflect changes to the data on the database
as the cursor moves through the data set.
[a]
[a]
This depends on the data type referenced. Some SQL3 data types use ...
Moving around and viewing data in a result set•
Updating data in a result set•
Retrieving data from a result set•
Handling data type issues•
In Chapter 4, “Connect...
Tài liệu Activity 9.4: Identifying Data Access Requirements ppt
... 9.4: Identifying Data Access
Requirements
In this activity, you will first identify the optimal data access method to use in a
given situation. Next, you will analyze the data access method selection ...
discussion.
74 Activity 9.4: Identifying Data Access Requirements
Exercise 1: Identifying a Data Access Method for a Scenario (10
minutes)
!
Identify data...