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1、学校代码： XXX学 号：XXX （本科毕业外文文献翻译学生姓名：XXX 学 院：信息工程学院系 别：计算机系专 业：软件工程班 级：软件06指导教师：XXX 讲师 二一年六月To connect SQL Server databaseFirst we introduce the basic knowledge of the database, be regarded as the warm-up exercise that study database weave distance front!1.warm-up exerciseNeeding first avowal is relatio
2、n database that database knowledge that we here introduce all point. The so-called relation database is to mean data as that the form gather, passing to establish simple form an a kind of database for of relation todefining construction.I ignore the watch at how saving way in physics in the document
3、 in database is, it can see to make an a line for with row, with electronics form is similar with the row. In relation database, the line were called the record, but the row then is called word segment. This form inside each an all in formations for is a record, it including particular customer, but
4、 each record then included the same type with the word segment of the quantity: Customers number, name etc.Form is logic set that a kind of related information that press a line of arranging with row, similar in single form in work.Each row of the word a database form inside calls a word segment. Wa
5、tch is from every kind of word a definition of its containment of, each word a data for describing its implying. While creating to set up a database, the beard assign for each word segment a the piece belongs to the sex with the other according to the type, biggest length. The word segment can inclu
6、de every kind of word sign, arithmetic figure even sketch.An information of relevant customer deposits in the line of the form, is called record. By any large, arbitrarily two records for database form to create set up cant be same.Key be a certain word segment( or several words segment) of the form
7、 inside, it() for fast inspect but drive index. The key can be unique, and also can then the right and wrong is unique, being decided by it() whether admission repetition. Unique key can specify for main key, using each one that come to unique marking form. The norm turns the database design of miss
8、ion be method that the data of buildup, but the data of buildup, should can dissolve otiose repetition, and for have thenecessary information offering to check to seek the path quickly. For attaining this kind of target but separate information to the process gone to in every kind of independent for
9、m, be called the norm turn.It is complicated process to use many appointed rules to proceed the norm with the type of the different Class that norm turn. That process studies and discuss already beyond the reach of textual scope. But, the norm of the simple database in majority turn and can use the
10、simple experience in underneath rule completes: include the form of the information of repetition must be divided into independent a few forms dissolve repetition.If we have chosen to learn 12 curricular 1000 students, the each curricular elucidation will show with the teacher 100 many- to choose th
11、at curricular and each student repeat once. To avoid this kind of low efficiency, should to turn the dichotomous and independent form in form to the norm,an is used to mean the student, the another uses mean the course.Now the form was turned by the norm, so, to changes the particular and curricular
12、 course describe or data, as long as change a record all right.Is a basic knowledge concerning database above, this is what study database plait distance must. Although the database technique is used as a course, its depth is not this space and can describe with the wide degree of, be used as the pr
13、imer with simple database plait the distance should be all right already.Like, underneath we can start practicing. We usually meet the database system is to registers the system, ignoring you are in the unit, or attend what buildup, the register is to cans not help of, and it of the construction is
14、more simple, we take a register system as an example. The analysis is once a data for involving.2. understanding the elementsFor the register, want the on the trail of information include:name 、sex、native place、age、date of birth、unit、address、postal service codes、telephone、FAX.Certainly, can create t
15、o set up a form in brief, make above each piece according to item to should a word segment.Need to point the form the main key in parties now, in order to unique marking each a record, increase register number conduct and actions unique key respectively in register form, guarantee a two records like
16、 this all different.To the database after making an above analysis, we can start establishing the database.3.set up the firm in campHere we study to establish the database how, needing to make sure the type that to establish the database first. Pass in Visual Basic the data interview control piece o
17、r data interview object ( DAO) can visit the following database:1)The database of JET, namely Microsoft Access2)The database of ISAM, such as: DBase, etc. of FoxPro3)The database of ODBC, every follow the standard of ODBC customer/ server database. Such as: Microsoft SQL Server, OracleBy any large,
18、if develop the personal small scaled database system, use Access database comparison accommodation, to develop the big and medium-sized database system uses the database of ODBC fester. But dBase with the database of FoxPro because of already dated, unless special circumstance, do not use otherwise.
19、 In our example, chose to use the database of Access certainly. Establish the database of Access contain two kinds of methods: While establishing the database in Microsoft Access. Click new set up button can establish the new form. Here we main introduction the second method: The usage can see to tu
20、rn the data management machine, do not need to weave the distance and then can create to set up the database. Can see to turn the data management machine is the applied procedure of a great use, it is a VB business enterprise version is supplementary with the profession version, in the catalogue. De
21、vastation vb samples the Visdata is next, its interface is as follows the diagram.Click the menu document item is next new set up son item Microsoft ACCESS son item of edition 7.0 MDB item. Input the new setting up the name of the database in flick window way open register, appear the underneath sho
22、w the window way:Want the born and new form, the single shot in right key database window way flicks the menu open, then the choice new form ordinaries, establishing in watch construction dialog box appeared later on a word for wanting segment. The every time faces to join in the form new word segme
23、nt, single shot increment word segment button, will appear of increment word segment dialog box.Increment word a type for options in the dialog box, according to word segment. In our the register database that establish, the type of the each word segment.Want to notice of is, because the word segmen
24、t registers the number be used unique marking record of, therefore, it cant be inputted by customer. So while defining the words segment need to be defined for Long data type, the automatic born word segment item is valid, and picks out this item. Be the customer like this to input to record with ot
25、her the different value every input a new record, system would on the words segment automatically.In ACCESS database, the key word realizes with the index of, conduct and actions plait distance personnel at gather to weave the distance to the record of the form type, needs to adjust to use index. Wh
26、ile searching, the technique of Rushmore uses the index information the excellent turning the search automatically. After completing the form definition, click increment index button, flick such aspen figure 5 show the window way.In window way the right side contain three optioned, its meaning, such
27、 as table,12.Increase the index dialog box options.After completing such as figure 6.Certainly, the academic association database establishes too not a dynasty the business of the one night, the reader no harm much practices once.Visit databases design and the development of the application procedur
28、es of MS Visual Basics of the databases of the SQL Server. When design a system, the customer still needs to comprehend to use to come to visit the plait distance of ask the data of SQL Server to connect. The origin was detailed to elaborate that the usage open type database conjunction (the Open Da
29、tabase Connectivity, ODBC) adjusts to connect the objects to connect with the class, still having the data interviews object (the Data Access Objects, the DAO) and the long-range data objects. Design and weave to write large and complicated and applied procedures database design for the software dev
30、eloper is a challenge, need to choose to weave the distance language and tools, do an accommodation for the SQL Server, choose the calculate way and the data structures, still need to design the sketch customer interface and the application procedures to connect. The decision within the most importa
31、nt software design is applied fixed position of the procedure. In other words, design must specify the system of which parts are data, business rule, and the data entrance procedure and used for circulating the code of other part. The MS Visual Basic supports the plait distance that some databases m
32、anage the systems connect, especially SQL Server. Adjust to connect to include the ODBC and DB-Libraries to connect the, object to connect to include the data interview object (DAO), long range data object (the RDO), the OLE DB and the ActiveX Data Objects (ADO) with the class, the SQL that returns
33、the capable SQL Server to manage the mission distributes to manage the object (the SQL Distributed management Objects, SQL-DMO) to connect. Connect the oculars right choice can improve the whole function of system and the development speed biggest. Design the large data warehouse system needs to cho
34、ose the applied model properly. Traditional customer/ services model depends on to join in the center layer but get the improvement to become three layer models. These three layers divide the line system as three parts: each layer is responsible for providing the service:(1) Data service( the Data S
35、ervice) contain the maintenance data and the operation date such as the increment, modification, deletion and backups. These services maintenance data relation and contact, support backup and instauration operation. Usually the data service is managed the system usage by the database.(2) business se
36、rvice( the Business Service) is handled the logic by the business rule and data to constitute, such as the data legitimacy rule, the business processing support and the record backup logics. The main purpose of these services provides the data maintenance toward the application procedure Logic.(3) e
37、xpression service( the Presentation Service)( or the customer service) support customer interface, control the customer data to input to express with data.(Output) Notice in customer/ services technical term, sometimes express the service definition as customers machine (or head), the data service d
38、efinition for server (or after carry), but the business service is in the center the layer (the middle layer). But important comprehend any two layers .The data service business service expresses the logic support GUI that the service maintenance database business rule and the processing data need,
39、data importation and manifestation the correspondences can think to carry on between customers machine and servers. For example, in the center the layer can think is a head.Server The physics realization of the system can carry on through many different paths. The underneath wills discuss three laye
40、r logic models three kinds of to carry out the method:1.Fat customer machine realizationMany layer (the multi tier) realizations of fat customer the machine realization three layer models of a kind of carry out the options is in the customers on board movement business and expression services. This
41、probably writes the most common path in the Visual Basic application procedure for the SQL Server. This kind of carries out the physics up only two layers:The server provides the data service only, this kind of method contain 2:00 shortage. First, was the applied procedure to compute the on board in
42、crement at the customer, customers calculators need to be stronger, this will increase the system expense, because the system usually takes several customers machines. When the system takes to have the number with thousand million of customers machine, this kind of method will become too expensive.
43、Another 1:00 shortage is a possible increment maintenance expenses. Move to the change of legitimacy logic and the business rule of the system and will cause upgrade customers machine procedure each time. If the system contain customers machine of the equal quantity, this is a problem. The biggest a
44、dvantage of the machine realization in fat customer is to reduce the network discharge, if the legitimacy and the business rules need not be decide by the database. Under this kind of circumstance, only pass the data of the legitimacy logic and can spread toward server. Be the example of the importa
45、tion data legitimacy, suppose the reader to have a small form (for example national form of name) to put in customers machine. If the data entrance mold piece checks the native watch but is not a more national name in main database, then will reduce the network discharge obviously. Another an import
46、ant use is in the development process of the system. If the head developer was limited to the interview carry behind, for example, cant pass the data in the database to verify to input the legitimacy, so, this kind of method can make it right processing data.2. Thin customer machine realizationIn th
47、in customer the machine realization, business the service locates the server, the business logic usually expresses for saving process.The Server, the saving process usages T-The SQL plait write. This kind of realization is like fat customers machine to carry out the similar physics up only two layer
48、s.The advantage of this kind of method is to reduce the system expense, because thin customers machine needs the less system resources, this have very important many systems of customers machines to take. And, support the expenses to also compare the fat customer the machine system is a little less,
49、 because the code carries the concentrated control in the server.If the business rule is depend on in the data of the database, thin customer the machine realization reduces the network discharge. The main shortage of this kind of method is a saving process to lack the vivid. The Visual Basic provide stronger than the T-SQL the plait distance abil
