【正文】 型頂級對象，最重要的3個(gè)ADO對象是Connection, Record set和Command。 Connection對象用于建立應(yīng)用程序和數(shù)據(jù)源的連接；Command對象用于定義一個(gè)SQL語句、一個(gè)存儲過程或其他對數(shù)據(jù)進(jìn)行操作的命令；Record set對象保存執(zhí)行命令后返回的記錄集。 通過調(diào)用Record set對象的其他方法，可實(shí)現(xiàn)對記錄集的修改、刪除、查詢等操作。4. 結(jié)語 VB提供了很多方法實(shí)現(xiàn)對數(shù)據(jù)庫的操作，其中DAO主要實(shí)現(xiàn)對ISAM數(shù)據(jù)庫的訪問，RDO提供對ODBC數(shù)據(jù)源的接口，RDO 和DAO 都已發(fā)展為相當(dāng)成熟的技術(shù)，在VB ，而Active Data Objects(ADO)作為微軟推出的新一代數(shù)據(jù)庫接口，被設(shè)計(jì)同新的數(shù)據(jù)訪問層OLE DB Provider一起協(xié)同工作，以提供通用數(shù)據(jù)訪問（Universal DataAccess），他向VB程序員提供了很多好處，包括易于使用，熟悉的界面，高速度以及較低的內(nèi)存占用（，％），由于以上原因，ADO將逐漸代替其他數(shù)據(jù)訪問接口，成為VB訪問數(shù)據(jù)庫的主要方式。Database development and applicationAlong with social development, human production and daily life increasingly inseparable from the information. Whoever has more effective information will then be in a stronger petitive position. The information industry is being the backbone of a country. Data as an information carrier, its database management tool for the importance of information technology, is gaining increasing attention. Only those with advanced database technology to effectively manage a broad array of data, and extract themselves from useful information to be used.From the late 1960s, the database system has been after 30 years of history, we have two generations of evolution. Firstgeneration database system is level with the network database system. Secondgeneration database system is relational database system. 30, people mainly secondgeneration database system to the theoretical research and system development and made great achievements. Improve relations marked the establishment of the theory of relational database theory and tend to improve. Commercialization of DB2, INGRES, , relational databases such as SQL SERVER marks the emergence of relational database system has been close to capacity. First and secondgeneration database system design objectives from mercial transaction processing. Over the years, these two generations of database system is mainly used for banking, the aircraft will deal with matters such as votes. From the 1980s to the present, people have been exploring the next generation of database systems theories, technologies and methods.The constant updating of puter hardware, and doubling their performance, and munication technology and puter network technology in the rapid development of a mon database for a leap in technology to produce a revolutionary application of the change. Relational databases, object databases and objects such as relational database technology, so that data has been deposited into the problem has been the better solution. How to find a better approach would be for users relevant types of data through the Internet / Intranet, from the global scope of the database is extracted, this is of great significance to users of the problem has bee information taxonomy (Information systematic IS) The main direction. Global major database vendors (Informix, IBM, Oracle, Sybase, Microsoft, etc.) To resolve this problem, has made a number of related technologies, by emphasizing Internet connectivity to help users extract and effective use of data.The data warehouse data, data mart, data mining techniques is considerably advanced database management system development.1. Data warehouse data: Data Warehouse tend to a logical concept, it developed in a number of databases on these databases can be physically separated, or even belonging to different countries. Data warehouse via the Internet to break geographical boundaries, they will be a synthesis of the overall logic, a massive database to the user before the show. Data Warehouse as a service to enterpriselevel applications, generally speaking provides users with the advantages of the following four aspects:a. Reduce the burden of system to simplify daytoday maintenance and managementb. Improving data integrity, patibility and effectivenessc. Improve the efficiency of data accessd. Provides simple, the unified inquiry and the report form mechanism2. Data rural fairs: The data warehouse took the enterprise application, it involves the scope and the investment cost is frequently huge, its construction is very easy to form the high investment, the slow progress big project. All these are the department/work teams did not hope saw and cannot accept. The department/work teams request in the pany interior to obtain one kind to suit own application easily, to use, also voluntarily directional, convenience highly effective open style data connection tool. Compares with the data warehouse, this kind of tool should a closer integration, have the integrity graphical user interface and a more appealing price. Is precisely department/work team39。s this kind of demand causes the data rural fair to arise at the historic moment. The data rural fair describes the brief summary is: The data rural fair is one kind smaller, the more centralized data warehouse, it has provided a department/work team level analysis mercial data inexpensive way for the pany. The data rural fair should have the characteristic includes: The scale small, face the specific application, face the department/work teams, the fast realization, the investment scale small, easy to use, to support the heterogeneous machine platform prehensively and so on. The user may act according to own demand, establishes the data rural fair by own way. No matter is by from the top downward, from bottom to top way establishment data rural fair, guaranteed most importantly the data rural fair can converse mutually, each other cannot municate the data rural fair is useless. Moreover, permits the people after the WWW visit data rural fair, causes it to provide the data accessing for more users, also is the essential function.3. Data mining’s: The data mining is from the database or the data warehouse discovered and withdraws hides in the among information one kind of new technology. It establishes in the database, above the data warehouse foundation, faces the nonspecialized user, locates in particular in the tabletop, and