linq or ado net

transactions in SQL Server can merge multiple database additions and deletions into a single unit of work, and can roll back any changes that have been made to any part of the operation during an error. Ado. NET also provides transactional functionality, through the ADO transaction, you can bind multiple tasks together, if all the tasks are successful, commit the

advantages and limitations of ADO are as follows.Advantage:L Simple.L and database transactions are almost fast.L transactions can be accessed across multiple databases.L Separate from the database, the proprietary code of different databases is hidden.Restriction: Transaction execution is on the database connection layer, so a connection needs to be maintained manually during the execution of the transaction. Note All commands m

The benefits of LINQ are very obvious, not only the database access layer is really object-oriented, but also the system's permissions can be encapsulated into the database access layer.Microsoft's current stable LINQ framework is the Entity Framework 6.1, I have written a database tool MR.E, can be used to design the database structure, and the database structure into the Entity framework of the object, ca

Http://www.codeproject.com/vb/net/SimulatingRecordsets.asp Introduction As any. Net developer knows, the ADO. net approach to data access is substantially different from the ADODB predecessor. First of all, because it isDisconnectedAnd mostly based onDataSetConcept (that involves a client-side data caching), while ADO

note, the same ). There are two methods to implement ing: (1) register the alias of the class in the ActionScript class. Use remoteclass (alias = ". Net fully qualified class name "); (2) Add the classmappings node to the Web. config file. In some cases, the first method fails. You can try the second method. Obviously, it is most convenient to use a value object to transmit data to. net. Of cours

ado| Access | data | Database in terms of syntax or style and design goals, ADO. NET is a significant difference from ADO. In ASP, access to the database through ADO, generally through the following four steps: 1, create a link to the database, that is, ado.connection; 2

Ado. NET composition: Terminal Data set: include: Dataset/datatable/datarow .... NET Framework data providers: including Connection/dataadapter/datareader/commandAdo. NET creates a connection to SQL Server through the SqlConnection class, SqlConnection represents a database connection,

time the same application domain can have multiple different types of connection pools. In detail, it is identified by the process, application domain, connection string, and the Windows identity (when using integrated security) to form a signature to identify the distinction. However, for the same application domain, it is generally only by the connection string to identify the distinction, that is, the connection string is different, cannot use the same connection pool, a program may have mor

zones (cache ),The data queried from the database can be retained.Or even display the entire database. Dataset can not only store multiple tables, but also obtain data table structures such as primary keys through the datasetcommand object and record the association between data tables. Dataset objects can be considered heavyweight objects in ADO. net,This object is structured on the datasetcommand object

As we all know, the biggest advantage of ADO. net over ADO is that the data update and modification can be performed when it is completely disconnected from the data source, and then the data update is passed back to the data source. This greatly reduces the occupation of Database Server resources due to excessive connections. The following is an example in my bo

of a database by using the Read method, and if you want to get the value of a column in that line, you only need to use the "[" and "]" operators. (e). Close the connection to the DataReader object and the database, respectively (ii) ADO. NET database access technology: With these days of learning, here's a summary of the knowledge points about data adapters and datasets: 　A. DataSet and DataTable: The dat

ADO. NET application ---- here, I will share my experiences with you. If you do not understand or have better insights, you can contact me to leave a message, we believe that our knowledge can be improved.First, let's take a simple look at ADO. NET is an object-oriented class library used to interact with data sources.

Visual Basic or VBA to process Excel Data~ And '(wavy lines and single quotes) instead of [], use ADO. NET test failed, report:FROM clause syntax error• When the worksheet name ([Sheet1 $]) is referenced, the data provider determines that the data table starts from a non-empty cell at the top left of the specified worksheet. For example, if the worksheet is empty from row 3rd, column C, row 3rd, column C,

Used to the way to access the database ADO, although the code is not written by the EF simple, but it is not troublesome. And the way EF does a multi-table query is that EF needs to go through the database to define the foreign key, then go through the code generation, and then use the Include method to make multiple table association queries. I don't really like that, but I'd rather write a SQL statement.So the A