I don't want to make it too complicated. I just want to demonstrate how to implement DataReader and DataSet. It plays a very interesting role and does not care whether the code structure is beautiful or the performance is good. I just want to achieve the purpose of this Article.
In order to facilitate your hands-on practice, the database uses ACCESS and a download link is provided at the end of the article. If SQL Server and ORACLE are to be used in the actual project, change the names of severa
This document is not repostedDream code-a programmer's self-white (1)
-- When a valuable person or thing passes away, those who remember him will establish a monument for it and write down the inscription.This article is dedicated to protein.
I have read a book also called "dream breaking code" and its English name is "Dream in code". I always think the translation is inaccurate. In that book, I talked about the experiences of a software project, the failures of the Chandler. However, today, t
The table's primary keys are all sequence, and the dataadpter update method is used. I don't know how the predecessors handled it. I am lazy as follows:
Public void Update (oracledataadapter ADP, dataset DS) {// DS is obtained by DS. getchanges (). Debug. Assert (ADP! = NULL ADP. selectcommand! = NULL Ds! = NULL); foreach (datatable TBL in DS. tables) //
;
}
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Process | data
--9i Migrate data file procedures
1. View View
SELECT * FROM Dba_data_files
Determine the location and name of the data file you want to move
Source location and name: '/HOME/ORACLE/PRODUCT/92/ORADATA/ADP/USERS02.DBF '
Target location and name: '/HOME/ORACLE/ORADATA/ADP/USERS02.DBF '
2. Shut down the database
Shutdown immediate;
3. Copy source data files to the development
. openorcreate, fileaccess. Read );
Byte [] mydata = new byte [fs. Length];FS. Read (mydata, 0, system. Convert. toint32 (FS. Length ));
FS. Close ();
Da. Fill (DS, "myimages ");
Datarow myrow;Myrow = Ds. Tables ["myimages"]. newrow ();
Myrow ["Description"] = "This wocould be description text ";Myrow ["imgfield"] = mydata;DS. Tables ["myimages"]. Rows. Add (myrow );Da. Update (DS, "myimages ");
Con. Close ();ThisCodeIt is an SQL server operation, but I already have some ideas. I chan
Many Access and SQLServer developers often face the problem of upgrading an Access database to an SQLServer database. Because of the existing Access Upgrade Wizard, this transformation process becomes quite simple, especially when you establish an ADP associated with SQLServer data. However, the Wizard is not perfect.
Many Access and SQL Server developers often face the problem of upgrading an Access database to the SQL Server database. Because of the
SQL Enterprise Manager ). (Note: These software is free of charge only if you have Microsoft Office or XP licenses .) Many companies that use SQLServer also use Office, and most of these companies have Office license versions that contain Access. In such a company, you can
Specific SQL Enterprise Manager ). (Note: These software is free of charge only if you have Microsoft Office 2000 or XP licenses .) Many companies that use SQL Server also use Office, and most of these companies have Office li
, determine whether there is a downstream metric at the specific metric point, or control the number of metric data.}}
Which of the following is a problematic generation? Too many ........Protected void TV _binder (){SqlConnection conn = DB. createConection ();SqlCommand cmd = new SqlCommand ("select * from Dep", conn );SqlDataAdapter adp = new SqlDataAdapter (cmd );DataSet ds = new DataSet ();Adp. Fill (ds
First connection through ibmDataSet ds = new DataSet ();OleDbConnection cn = new OleDbConnection ("Provider = IBMDA400.1; Data Source = 192.168.21.10; User ID = b4dd;" +"Password = b4dd; Default Collection = QIBMPP ");Cn. Open ();OleDbDataAdapter adp = new OleDbDataAdapter ("select * from qibmpp. CUSTOM", cn );Adp. Fill (ds, "0 ");If (ds. Tables. Count> 0){DataGridView1.Refresh ();This. dataGridView1.DataSo
datagrid| Index | problem
When the dataset is bound to the DataGrid control,
and use the DataAdapter object to modify the database
Such as:Dim adp As New OleDbDataAdapter (Stradp,conn)Dim ocb As New OleDbCommandBuilder (ADP)Adp. DeleteCommand = OCB. GetDeleteCommand ()Adp. Update (ds, "Orders")-------------------------
, open the Access 2003 database, and click Tools-Database Utilities-Upsizing Wizard.3. In the Upsizing Wizard, select New database and click Next. Select the server with SQL Server 2005Express installed as the import server, using the default database name,Click "Next". Add the tables that are available in to export to SQL Server.Click "Next". Upsize The default table properties,Click "Next". Create a new ADP file,Click "Next". Click Open new
Many access and SQL Server developers are often faced with the problem of upgrading an Access database to a SQL Server database. Because of the existing Access Upgrade Wizard, the process of this transformation becomes quite simple, especially if you are creating an ADP associated with SQL Server data. However, the Wizards are not perfect, and the problems that need to be solved are significant.
First of all, some objects are not simply upgrades, so
The maximum capacity of access access is in the Chinese version of Access 2000, for example. Open the Help and locate the following entry:
Set up and define Microsoft Access-> Microsoft Access specifications
Microsoft Access Database General specifications
Attribute Maximum Value
Microsoft Access database (. mdb) file size 2 G bytes. However, since the data
Libraries can include linked tables in other files, so their size is actually only available
Limits on the size of the storage space.
Numbe
basic access method to the database, and thread safety for the same active object (not closed).
//
Public class sqlmanipulation:IDisposable{Public sqlmanipulation(string strdsn, SqlType sqltype){_sqltype = SqlType;
_STRDSN = strDSN; }# region Private variables
PrivateSqlType _sqltype;Private string_STRDSN;PrivateDbConnection _conn;Private BOOL_disposed;#endregion
Private DbConnection getconnection(){DbConnection conn;Switch(_sqltype) { CaseSqlType.SqlS
scriptsynopsisservice SCRIPT COMMAND [Options]service --status-allservice--help | -H | --versiondescriptionservice runs a System V init script in as predictable environment as possible, removing most environme NT Vari-ables and with the current working directory set to/. The script parameter specifies a System V init SCRIPT, located in/etc/init.d/script. The supported values Ofcommand depend on the invoked script, service passes COMMAND and OPTIONS it to the init script UNMO Dified.
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