connecting to a sql server database using vb net

... SQL Server database */ using System; using System.Data; using System.Data.SqlClient; class MySqlConnection { public static void Main() { // formulate a string containing the details of the // database ... SQL Server and use those credentials to connect to the database This saves you from providing a separate username and password to SQL Server You can use integrated security in your program by ... don't have to wait for a brand new connection to the database to be established when there's a suitable connection already available When you close a connection, that connection isn't actually closed;...

Ngày tải lên: 07/11/2013, 10:15

... = new SqlConnection( "server= localhost ;database= Northwind;uid=sa;pwd=sa"); // monitor the StateChange event using the StateChangeHandler() method mySqlConnection.StateChange += new StateChangeEventHandler(StateChangeHandler); ... InfoMessage event fires when the database returns a warning or information message produced by the database You use the InfoMessage event to monitor these messages To get the message, you read the ... illustrates the use of the 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;...

Ngày tải lên: 14/12/2013, 13:15

Ngày tải lên: 21/01/2014, 11:20

... "database" chọn "New Database" hình vẽ sau: Sau việc đánh tên database click OK Ngoài dùng SQL script để tạo database Khi ta phải rõ vị trí primary data file transaction log file Ví dụ: USE master ... Visual Basic 6.0 Authors AuthID First Name Last Name A1 John Brown A2 Matthew Bortniker A3 Rick Johnson A4 Peter Wright A5 James Moon AuthorBook BookID AuthID A1 A2 A3 A4 A5 A1 Ngoài điều quan ... thông tin database object (table, view ) hay data type Sp_helpdb [ 'database' ] Cung cấp thông tin database cụ thể Sp_monitor Cho biết độ bận rộn SQL Server Sp_spaceused ['object', 'updateusage' Cung...

Ngày tải lên: 25/08/2012, 09:00

... "database" chọn "New Database" hình vẽ sau: Sau việc đánh tên database click OK Ngoài dùng SQL script để tạo database Khi ta phải rõ vị trí primary data file transaction log file Ví dụ: USE master ... SQL Server Transaction log file SQL Server dùng để ghi lại thay đổi xảy database Quá trình diễn sau: có thay đổi data Insert, Update, Delete yêu cầu từ ứng dụng, SQL Server tải (load) data page ... 2000 Server Beginning Visual Basic 6.0 Authors AuthID A1 A2 A3 A4 A5 First Name John Matthew Rick Peter James Last Name Brown Bortniker Johnson Wright Moon AuthorBook BookID 2 3 AuthID A1 A2 A3 A4 ...

Ngày tải lên: 06/10/2013, 17:20

... CommandBuilder SqlDataAdapter da = new SqlDataAdapter(cmd); SqlCommandBuilder cb = new SqlCommandBuilder(da); // Fill table using the DataAdapter DataTable dt = new DataTable( ); da.Fill(dt); // ... changing data 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 ... Start the transaction tran = conn.BeginTransaction(IsolationLevel.ReadCommitted); // Create the command SqlCommand cmd = new SqlCommand(sqlText, conn, tran); // Create the DataAdapter and CommandBuilder...

Ngày tải lên: 17/10/2013, 20:15

... CommandBuilder SqlDataAdapter da = new SqlDataAdapter(cmd); SqlCommandBuilder cb = new SqlCommandBuilder(da); // Fill table using the DataAdapter DataTable dt = new DataTable( ); da.Fill(dt); // ... changing data 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 ... Start the transaction tran = conn.BeginTransaction(IsolationLevel.ReadCommitted); // Create the command SqlCommand cmd = new SqlCommand(sqlText, conn, tran); // Create the DataAdapter and CommandBuilder...

Ngày tải lên: 14/12/2013, 18:16

... secured database while the actual permissions are stored in the database file When you connect to a secured Jet database, the user ID and password are validated [ Team LiB ] against the values ... string attributes in addition to those defined by ADO .NET To open a database secured by Microsoft Access user-level security, use the Jet OLEDB:System Database attribute in the connection string to ... Microsoft Access user-level security requires an additional file—the workgroup information or MDW file—in addition to the database or MDB file This file contains the user and group information for...

Ngày tải lên: 24/12/2013, 05:15

Ngày tải lên: 21/01/2014, 12:20

Ngày tải lên: 26/01/2014, 10:20

Ngày tải lên: 26/01/2014, 11:20

Ngày tải lên: 23/10/2014, 18:38

... Server Client tools such as Enterprise Manager and Query Analyzer are also shared The System.Data.SqlClient class cannot automatically discover the port number of a named instance of SQL Server listening ... on SQL Server 2000 is 16 The Microsoft Distributed Transaction Coordinator (DTC) and the Microsoft Search services are installed and used simultaneously by every installed instance of SQL Server ... the same computer Each instance has its own set of system and user databases that are not shared between instances and it runs within its own security context The maximum number of instances...

Ngày tải lên: 14/12/2013, 18:16

... Interface and log onto the system Navigate to Database > Connection and add a new database handler for Microsoft SQL Server Click Save to add the database handler to the configuration Navigate to Database ... MySQL port) Database: (left blank / database is created via the opn_mysql .sql script) How to create a Microsoft SQL Server database for the OPN System™ XT Server? Connecting to an Oracle database ... for each database required login information when connecting to the database sql scripts Each of the database types has a sql file that you need to: Modify to point to the right database Run to...

Ngày tải lên: 20/12/2013, 23:15

... cmd.CreateParameter("CustomerID", ADODB.DataTypeEnum.adChar, ADODB.ParameterDirectionEnum.adParamInput, 5) cmd.Parameters.Append(prm) prm.Value = "CHOPS" OpenNorthwindADOConnection(cnn) cmd.ActiveConnection ... rstCurr.GetString Catch excp As Exception MessageBox.Show(excp.Message) End Try End Sub The last thing that this routine does is open a recordset based on the Command object This is to the use just ... records that are needed In this case, the GetString method is used to assign it to the results text box If you are using a bulk query, shown in the next section, you would use the Execute method To...

Ngày tải lên: 14/12/2013, 20:16

... Discussion A Microsoft Access database password requires that users enter a password to obtain access to the database and database objects This is also known as share-level security A password does ... not allow groups or users to have distinct levels of access or permissions Anyone with the password has unrestricted access to the database The Set Database command from the Tools database password ... Microsoft Access database password, use the Jet OLEDB :Database Password attribute in the connection string to specify the password This corresponds to the OLE DB property DBPROP_JETOLEDB_DATABASEPASSWORD...

Ngày tải lên: 24/12/2013, 05:15

Ngày tải lên: 24/12/2013, 06:17

Ngày tải lên: 21/01/2014, 11:20

Ngày tải lên: 21/01/2014, 12:20

... "ORDER BY CompanyName"; // Retrieve the plan into DataReader SqlDataReader dr = cmd.ExecuteReader( ); // Iterate over all result sets and all rows to get plan { while (dr.Read( )) sb.Append(dr.GetString(0) ... Execution category) is ON, SQL Server returns a result set containing detailed information about how the SQL statements are going to be executed rather than actually executing the statements Two ... categories Category Description Date and Time Alters current session settings for handling of date and time data Locking Alters current session settings for handling SQL Server locking Miscellaneous Alters...

Ngày tải lên: 28/10/2013, 18:15