dynaset

crecordsetchild Based on the crecordset class, specify the data source in the database Options dialog box, select dsn_odbcdemo in ODBC, and select Dynamic dynaset in recordset type. Click OK. In the displayed dialog box, select the table studentinfo to exit;3. Add the header file # include 4. Add member variables in * DLG class Public: cdatabase m_db; // database object crecordsetchild * m_pset; // record set pointer 5. Add the header file # include

data name, description, Select Server "(local)", next, select the SQL Server verification that the user enters the login ID and password, enter the login ID and Password, next, select change default database, next, complete, test .)B. Define the crecordset object and call its open method to open the record set, as shown inCrecordset RS ( m_db );Virtual bool open (uint nopentype = afx_db_use_default_type, lpctstr lpszsql = NULL, DWORD dwoptions = none );Parameter 1 is the open type, as shown

database object variables2.1 AdvantagesOdbc2.0 management functions can be accessed in a programMultiple record set types can be controlled: dynaset, snapshop, and table record set objectAllows you to access stored procedures and query actions.You can access database collection objects, such as tabledefs, fields, indexes, and querydefs.Real Transaction processing capabilities, including Start transaction (begintrans), commit transaction (committrans)

Recently, we are using the mfc odbc Class to develop a database application, because we have never used the mfc odbc Class. I have paid a lot of effort for this. In addition, many new users are asking related questions in CSDN and other communities, so that they do not forget their troubles. So I found a place and wrote it down for query.1. CDatabase Class and CRecordset Class can be directly used without having to derive new class2. When using the CRecordset class directly, it is best to declar

This example illustrates how to use an Access database file with the IE4 virtual list view. Loading large amounts of data into CListView derived classes is a very slow process, even when data is in memory. It is much slower to access data in the database. A list of new features is the ability to reload when it needs data. Here is the concrete step. You must install IE3 later version of the COMCTL32.DLL. Open your database file. Use your document object to open your database files and records

database technology is a complex science, and the following recommendations do not mean to be used as rules.1. The Recordsettype-recordsettype property determines whether the recordset is a table, a dynamic set (dynaset), or a snapshot. This selection will affect which Recordset properties are available. For example, a snapshot-type Recordset has more restrictions than a dynaset record set.2. The Defaultty

, which means the network call performance has become lower. However, this method also has two advantages. First, once the record is downloaded, the network activity required by the workstation is almost lost, which releases the bandwidth for other requests. In short, you will see an increase in network throughput. Second, because all the applied records are on the user's machine, the user will actually get better overall performance of the application. You may want to restrict the snapshot meth

Binary search trees have the following properties:X is a node in a two-fork lookup tree, and if Y is a node in the X left dial hand tree, then y.key≤x.key; If Y is a node in the X right subtree, then X.key≥y.key.The time to perform basic operations on a binary tree is proportional to the height of the tree. When this tree is a fully binary tree, the worst case run time for these operations is θ (LGN), and if the tree is a linear chain with n nodes, the worst case scenario for these operations is

cdatabase object represents a connection to the data source, through which the data source can be operated. Generally, you do not need to directly use the cdatabase object because the cdecordset object can implement most functions. However, cdatabase plays a key role in transaction processing. Crecordset class: A crecordset object represents a set of records selected from the data source-record set. The record set has two forms: snapshot and dynaset