数据库和ADO笔记（Database and ADO notes）.docVIP

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数据库和ADO笔记（Database and ADO notes）.doc

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数据库和ADO笔记（Database and ADO notes）

数据库和ADO笔记（Database and ADO notes） A database and ADO 1. How to use the VC database 1.1. ODBC - provides a set of database apis that provide the encapsulation class for ODBC in MFC. 1.2. DAO - has been abandoned and no longer used 1.3. OLE DB - provides a set of COM interfaces to compare the underlying database access methods. The use is relatively tedious, but the efficiency is the highest 1.4 ADO - the most popular way of accessing databases. A set of COM interfaces based on the OLE DB interface. Use ActiveX to encapsulate OLE DB Use of ODBC 1. ODBC MFC correlation 1.1, cdatabase-database connection, etc 1.2 operation of CRecordSet - data set 1.3. Crecordview-display View of the record Header file # include afxdb.h 2. Use of ODBC Build the ODBC database Create database Add to ODBC data source Control panel - management tool - data source (ODBC) User DSN - current user can use All users of the system DSN - system can be used File DSN - set by file Set the data source name, configure the database, Create data source 2.2 connect to the database CDatabase: : Open 2.3. Query and other operations on the database CRecordSet: : Open execution query and other SQL statements 2.4 disconnect CDatabase: : Close 2.5. Bind CRecordSet A subclass based on CRecordSet Void CMsgSet: public CRecordset () { } Select the data source and table name to bind to Use Open to Open the connection and get the data CMsgSet set; Set. The Open (); The data of the current record is automatically saved to the class member variable, which can be used directly. AfxMessageBox (set. M_MSG_ID + set. M_MSG_CONTENT); Three ADO 1. ADO (ActiveX Data Object) The OLE DB interface is called at the bottom, and the ActiveX is used to encapsulate it Connection management interface of Connection - database The management interface for Recordset - Recordset Command - SQL statement execution interface 2. Import of ADOs library ADO component, storage path C: \ Program Files \ Common Files \ System \ ado \ msado15 DLL