... a SQLServer
Database
Tác giả: Vovisoft.com
Cấu Trúc Của SQL Server
Như đã trình bày ở các bài trước một trong những đặc điểm của SQLServer 2000
là Multiple-Instance nên khi nói đến một (SQL) ... 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; ... động lại
SQL Server hay khi ta disconnect.
• Model : Database này đóng vai trò như một bảng kẻm (template) cho các
database khác. Nghĩa là khi một user database được tạo ra thì SQLServer
sẽ...
... Implement a SQLServerDatabase
3.1. Cấu Trúc Của SQL Server
Như đã trình bày ở các bài trước một trong những đặc điểm của SQLServer 2000 là
Multiple-Instance nên khi nói đến một (SQL) Server nào ... đến một Instance của
SQL Server 2000, thông thường đó là Default Instance. Một Instance của SQLServer 2000
có 4 system databases và một hay nhiều user database. Các system databases bao gồm:
• ... Msdb : Database này được SQLServer Agent sử dụng để hoạch định các báo động
và các công việc cần làm (schedule alerts and jobs).
3.2. Cấu Trúc Vật Lý Của Một SQLServer Database
Mỗi một database...
... conn.BeginTransaction(IsolationLevel.ReadCommitted);
// Create the command.
SqlCommand cmd = new SqlCommand(sqlText, conn, tran);
// Create the DataAdapter and CommandBuilder.
SqlDataAdapter da = new SqlDataAdapter(cmd);
SqlCommandBuilder ... 6.14 Specifying Locking Hints in a SQLServerDatabase
Problem
You need to pessimistically lock rows in an underlying SQLServer database.
Solution
Use SQLServer locking hints from ADO.NET. ... if(holdLockRadioButton.Checked)
sqlText += "(HOLDLOCK)";
// Create connection.
conn = new SqlConnection(
ConfigurationSettings.AppSettings[" ;Sql_ ConnectString"]);
conn.Open(...
... Edition 38
SQL Server 2000 Desktop Engine 39
SQL Server 2000 Windows CE Edition 39
Should You Migrate to SQLServer 2000? 41
How Will SQLServer 2000 Benefit My Organization? 42
Will SQLServer 2000 ... Successful SQLServer Migration 46
Migrating to SQLServer 2000 46
Upgrading from SQLServer 6.5: Active/Passive Mode 49
Upgrading from SQLServer 6.5: Active/Active Mode 50
Upgrading from SQLServer ... Wizard: Name the Database
and Specify Its Location 155
Create Database Wizard: Name the Database Files 155
Create Database Wizard: Define the
Database File Growth 156
Create Database Wizard:...
... string to the constructor
SqlConnection mySqlConnection =
Using a SqlConnection Object to Connect to a SQLServerDatabase
You create a SqlConnection object using the SqlConnection() constructor. ... System.Data.SqlClient namespace, you can create a new
SqlConnection object using the following statement:
SqlConnection mySqlConnection = new SqlConnection();
You can then set the details for the database ... is as follows:
mySqlConnection.ConnectionString = server= localhost ;database= Northwind;uid=sa;
mySqlConnection.ConnectionTimeout = 15
mySqlConnection .Database = Northwind
mySqlConnection.DataSource...
... System.EventArgs) Handles MyBase.Load
LoadSQLServers(Me.lstFromSQLServer)
LoadSQLServers(Me.lstToSQLServer)
End Sub
3. On the lstFromSQLServer and lstToSQLServer list boxes, add the code in Listing ... ' Create the connection and specify the stored procedure to use.
Dim odb As SQLDMO .Database
Dim otbl As SQLDMO.Table
Dim oapp As New SQLDMO.Application()
Dim osvr As New SQLDMO.SQLServer() ... System.EventArgs) Handles
lstFromSQLServer.SelectedIndexChanged
GetSQLDatabases(Me.lstFromSQLServer.SelectedItem, Me.lstFromDB)
End Sub
Private Sub lstToSQLServer_SelectedIndexChanged(ByVal...
...
StateChange event of the mySqlConnection object:
// open mySqlConnection
mySqlConnection.Open();
// create a SqlCommand object
SqlCommand mySqlCommand = mySqlConnection.CreateCommand();
... static void Main()
{
// create a SqlConnection object
SqlConnection mySqlConnection =
new SqlConnection(" ;server= localhost ;database= Northwind;uid=sa;pwd=sa");
// monitor the ... Console.WriteLine("Calling mySqlConnection.Open()");
mySqlConnection.Open();
// close mySqlConnection, causing the State to change from Open
// to Closed
Console.WriteLine("Calling mySqlConnection.Close()");...
... conn.BeginTransaction(IsolationLevel.ReadCommitted);
// Create the command.
SqlCommand cmd = new SqlCommand(sqlText, conn, tran);
// Create the DataAdapter and CommandBuilder.
SqlDataAdapter da = new SqlDataAdapter(cmd);
SqlCommandBuilder ... if(holdLockRadioButton.Checked)
sqlText += "(HOLDLOCK)";
// Create connection.
conn = new SqlConnection(
ConfigurationSettings.AppSettings[" ;Sql_ ConnectString"]);
conn.Open( ... internally by the lock manager.
•
The SQLServer Profiler can be used to monitor and record locking information.
•
The Windows Performance Monitor has a SQLServer Locks Object counter that
can...
...
6.8 Create and Call SQLServer 2000 User-Defined Functions
In SQLServer 2000, I have heard that you can create user-defined functions (UDFs).
Where would you use UDFs, and how do you create ... within T -SQL?
Technique
UDFs have been used for years in application development languages. You can now
create them in SQLServer 2000 as well.
Creating SQLServer 2000 UDFs
You can create ... Handles MyBase.Load
' Create the UDF string
Dim strSQL As String
strSQL = " ;CREATE FUNCTION udf_ShowProdAndCat ( @UnitPriceParm
money)"
strSQL &= "RETURNS @ProdAndCatTab...
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