... hassles trying to track the data table directly.
dtFromGrid = CType(dgTableData.DataSource, DataTable)
' Commands necessary to actually post back to server.
modaLookupData .Update( dtFromGrid) ... ByVal e As System.EventArgs) Handles
lstLookupTables.SelectedIndexChanged
Dim dtData As New DataTable()
Try
' Update the data adapter and data table to reflect the new data, ... the modaLookupData data adapter,
and it is used toupdate the data table. The Update method of modaLookupData is
executed, followed by the AcceptChanges method of the dtFromGrid data table....
... mdtLookupData is being storedtoa Session object entry called
MyDataTable, and a Boolean variable called IsAdding is set to False. This last
variable will be set to True when the btnAdd is clicked and ...
' Get the data and put it in the data table.
odaLookupData.Fill(dtNew)
' Save the data table toa session variable so that
' you don't lose it on a trip back to ... mdtLookupData.Rows(e.Item.ItemIndex + GetPageRows()).Delete()
' Commands are necessary to actually post back to the server.
cnn.Open()
odaTableData .Update( mdtLookupData)
mdtLookupData.AcceptChanges()
...
... MYSQLCONNECTION.CS
/*
MySqlConnection.cs illustrates how to use a
SqlConnection object to connect toaSQLServerdatabase
*/
using System;
using System.Data;
using System.Data.SqlClient; ...
Using a SqlConnection Object to Connect toaSQLServerDatabase
You create a SqlConnection object using the SqlConnection() constructor. This
constructor is overloaded, meaning that there are multiple ... using System;
using System.Data;
using System.Data.SqlClient;
class ConnectionPooling
{
public static void Main()
{
// create a SqlConnection object to connect to the database, ...
... class.
The following example defines a method named StateChangeHandler to handle the
StateChange event. You'll notice that the second parameter to this method is a
StateChangeEventArgs ... StateChange event.
Listing 7.3: STATECHANGE.CS
/*
StateChange.cs illustrates how to use the StateChange event
*/
using System;
using System.Data;
using System.Data.SqlClient;
class ... object
SqlConnection mySqlConnection =
new SqlConnection(" ;server= localhost ;database= Northwind;uid=sa;pwd=sa");
// monitor the StateChange event using the StateChangeHandler()...
... Contact List from the embedded databasetoa new
database, see the How to export Contact list from McKoi databaseto Microsoft SQL Server?
document.
Step 1: Download a shareware database management ... Start the Web Configuration Interface and log onto the system.
3. Navigate toDatabase > Connection and add a new database handler for Microsoft SQL
Server.
Click Save to add the database ... database handler to the configuration.
4. Navigate toDatabase > Selection and select the newly created Microsoft SQLServer
database for all database selections.
How to create a Microsoft SQL...
...
SQL Server hay khi ta disconnect.
• Model : Database này đóng vai trò như một bảng kẻm (template) cho các
database khác. Ngh a là khi một user database được tạo ra thì SQLServer
sẽ copy to n ... Thiết Kế Một Database
Tạo Một User Database
Chúng ta có thể tạo một database dễ dàng dùng SQLServer Enterprise bằng cách
right-click lên trên " ;database& quot; và chọn "New Database& quot; ... (tables, stored procedures ) từ Model
database sang database mới v a tạo.
• Msdb : Database này được SQLServer Agent sử dụng để hoạch định các
báo động và các công việc cần làm (schedule alerts...
... (template) cho các database
khác. Ngh a là khi một user database được tạo ra thì SQLServer sẽ copy to n bộ các
system objects (tables, stored procedures ) từ Model database sang database mới
v a ... (SQL) Server nào đó là ta nói đến một Instance c a
SQLServer 2000, thông thường đó là Default Instance. Một Instance c aSQLServer 2000
có 4 system databases và một hay nhiều user database. ...
Sp_help ['object']
Cung cấp thông tin về một database object (table, view )
hay một data type.
Sp_helpdb [&apos ;database& apos;] Cung cấp thông tin về một database cụ thể nào đó.
Sau đó...
... command.
SqlCommand cmd = new SqlCommand(sqlText, conn, tran);
// Create the DataAdapter and CommandBuilder.
SqlDataAdapter da = new SqlDataAdapter(cmd);
SqlCommandBuilder cb = new SqlCommandBuilder(da); ... ReadCommitted. A DataAdapter is used on the
transacted connection to fill a DataTable. A CommandBuilder is created to
generate updating logic. The default view of the table is bound to the data grid ... being read by a user and preventing users from reading data being changed by a
user. Locks are acquired and released by user actions; they are managed internally by
database software.
A locking...
... command.
SqlCommand cmd = new SqlCommand(sqlText, conn, tran);
// Create the DataAdapter and CommandBuilder.
SqlDataAdapter da = new SqlDataAdapter(cmd);
SqlCommandBuilder cb = new SqlCommandBuilder(da); ... as a transaction with an isolation level
of READ COMMITTED.
READUNCOMMITTED Same as NOLOCK.
REPEATABLEREAD
Use the same locking as a transaction with an isolation level
of REPEATABLE READ. ... SqlCommandBuilder(da);
// Fill table using the DataAdapter.
DataTable dt = new DataTable( );
da.Fill(dt);
// Bind the default view of the table to the grid.
dataGrid.DataSource = dt.DefaultView;...
... Listing A. 8.
Listing A. 8 basCommandExamples.vb: Calling aStoredProcedure By Using
Parameters
Sub UseAStoredProcedureWithAParameter(ByVal txtResults As TextBox)
Dim cnn As New ADODB.Connection() ... for a given customer.
Listing A. 7 Northwind SQLServer Database: T -SQL for the StoredProcedure
Called CustOrdersHist
ALTER PROCEDURE CustOrderHist @CustomerID nchar(5)
AS
SELECT ProductName, ... Executing aSQLServerStoredProcedure By Using ActiveX Data Objects
If you are doing an ADO development with client server for backends, then you probably
call stored procedures. In...
... InputOutput
The parameter is both an input and output parameter, allowing the caller
to pass a data value to the storedprocedure and the storedprocedureto
pass a data value back to the caller. ...
Output
The parameter is an output parameter allowing the storedprocedureto
pass a data value back to the caller.
ReturnValue The parameter represents the value returned from the stored procedure. ... are usingastoredprocedureto create a DataReader and need to get the return value.
When you try to access the value, it is null. How can you access the return value?
Solution
Use a parameter...