Visual Basic 6 Client/Server Programming Gold Book:Table of ...

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Brief Full Advanced Search Search Tips To access the contents, click the chapter and section titles. Visual Basic 6 Client/Server Programming Gold Book (Publisher: The Coriolis Group) Author(s): Michael MacDonald and Kurt Cagle ISBN: 1576102823 Publication Date: 10/01/98 Search this book: Previous Table of Contents Next Considerations In Selecting An RDBMS As shown with the simple Microsoft Access illustration, your choice of RDBMS can have a dramatic impact on both the performance and the maintainability of your application. Choosing the RDBMS is then a critical decision point in your overall client/server strategy. It is easy to jump to the conclusion that—assuming money, hardware, and so on are not an issue—you should simply purchase the most powerful engine on the market. Unfortunately, things are seldom that clear-cut. The marketing hype that passes for serious advertising from the various database vendors doesn’t lend much light to the discussion either. Open any database magazine and you can see ads from Sybase and Oracle both proclaiming how each clobbers the other in side-by-side comparisons. Visit either vendor’s Web site, and the same guidance is presented in more detail. In truth, the claims of all the vendors can probably be substantiated; it is the assumptions each makes about operating environments that renders one more powerful than the other in one test versus another. In any case, the most powerful engine may also be the most difficult to administer or it may simply be overkill for your organization. In the following pages, I provide some general considerations in selecting an RDBMS for your client/server environment. These considerations include: • Network operating system • Typical database usage • Number of users and volume of data • Database administration • Database cost • Vendor stability and reputation Of necessity, it is not possible to reach any definitive conclusions because the
proper choice is highly dependent on each organization’s needs and environment. Further, although I have, in fact, used most of the products that I discuss in the next section (“A Survey Of Available RDBMSs”), I have not used all of them, and any specific recommendations are likely to be somewhat subjective. Of course, your organization may have already deployed an RDBMS that is serving you quite well. In that case, get a cup of coffee and then move on to the next section. Network Operating System Perhaps the first consideration in choosing a database is the network operating system (NOS) upon which it is to run. Few vendors support all server operating systems, so if you are constrained to choosing from vendors whose product runs on, say, OS/2, the field of viable candidates is automatically reduced. It is possible, of course, to run a different operating system for your database server than you do for other portions of your network (and many organizations do just that). However, my recommendation is to always keep the environment as simple as possible. That recommendation includes avoiding running multiple operating systems across the network if possible. Along the same lines, you may have other environments with which you need to integrate. If you need to run your client/server applications with mainframe data, you might want to consider products that make this easier. IBM’s DB2 running on OS/2 is a popular choice for shops with this need. XDB Systems also markets a capable database product that can run against DB2, IMS, and VSAM data on the mainframe. An additional consideration with your NOS arises with the subject of multiple processors. Increasingly, high-end servers come configured with two, four, and even eight processors. However, if the NOS is incapable of using the processors, the database cannot use the processors. For instance, Novel NetWare 3.1x runs quite comfortably on an Intel-based machine running dual processors; it simply ignores the second CPU. NetWare 4.x does take advantage of the additional processors. Assuming your NOS supports multiple processors, your database may not (or you might need to tell the database to use those processors). Typical Database Usage In general, database applications tend to fall into two categories: transaction processing and decision support. An online transaction processing (OLTP) system, such as an order-entry application or a banking system, is typically transaction oriented. Often, larger systems may need to process many transactions per second (TPS). On the other hand, a decision support system (DSS) is typically a large database upon which sits all or a large subset of corporate data, which people analyze to make informed management decisions. The system may have many
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Page 3 and 4: The Active Data Control Where To Go
Page 5 and 6: Index Products | Contact Us | About
Page 7 and 8: technology. We have kept our eye to
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Page 11 and 12: and sell through your Web site. (Tr
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You can join together more than two
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Brief Full Advanced Search Search T
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SELECT EMP_NO AS 'NUMBER', EMP_LNAM
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FROM EMPLOYEE The result is: MIN(EM
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GENEVIEVE WESLEY The LTRIM function
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(15, 2) returns 1 because 15 divide
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SELECT SUM(EMP_SALARY) FROM EMPLOYE
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300 66958.36 400 53983.02 You can n
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ORDER BY EMP_DEPT_NO The output of
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SELECT EMP_NO, EMP_FNAME, EMP_LNAME
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the ODBC API as a means of database
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DAO/Jet * 4 7 5 6 DAO/ODBCDirect Da
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Listing 4.1 opens three files (in A
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Dim sBuffer As String * 512 Get #iF
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ODBCDirect was added to DAO with ve
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later in this chapter. For new rela
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End Sub Figure 4.5 The Employee app
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Listing 4.3 Code from frmDSNList. P
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When placing a data-aware control o
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Str$(Adodc1.RecordSet.RecordCount)
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similar to general modules in that
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source to other objects, including
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If bCancel Then adStatus = adStatus
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Structured Query Language, which li
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Figure 5.1 DAO objects in the Jet w
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dbVersion11 new_db will be the Jet
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collection after database operation
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dbDecimal Decimal dbDouble Double d
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nested transactions in an ODBCDirec
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wrkEmp.BeginTrans ' Start of inner
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Set User = object.CreateUser (name,
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three properties: Name, Password, a
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Database Type Specifier Example Mic
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QueryDef object and thus omits the
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this, specify a URL instead of a fi
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topic. Connection also has a Cancel
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docTemp.Properties.Append prpTemp d
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property is useful when two users m
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ForeignName property is set to the
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• The Primary property is a Boole
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' Display how many unique values th
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current object should be replicated
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"EMP_LNAME, EMP_SALARY FROM EMPLOYE
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set automatically reflects the chan
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workspaces. In a Jet workspace, BOF
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each record in the RecordSet. The c
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occurrences. FindLast finds the las
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Products | Contact Us | About Us |
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chapter provides an example of usin
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End Sub Table 5.15 Constants for th
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loaded as it does in DAO, and RDO p
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doEngine object is created. Additio
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messages (ODBC SQL_SUCCESS_WITH_INF
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Previous Table of Contents Next Pro
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in an rdoEnvironment object, all rd
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If cSalary !emp_Salary Then ' If c
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password parameters are not supplie
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The rdoConnections Collection And r
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Command1(0).Enabled = True Command1
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Dim vErr As rdoError For Each vErr
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objects. If the query was successfu
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embrace where two processes lock ea
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Connect:="UID=Coriolis;PWD=Coriolis
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If MsgBox(sMsg, vbYesNo & vbQuestio
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pbStatus.Value = .PercentPosition D
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cannot be updated. If the columns r
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Dim vArray As Variant ' Get 100 row
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modified. You can set the Cancel ar
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The SourceColumn and SourceTable pr
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stored procedures from Visual Basic
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Figure 6.6 The RDO parameters demon
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Private Sub MSRDC1_Error(Number As
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With VB6 comes MDAC 2.0, which adde
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Remote Data Services (RDS) is a dev
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adGUID Globally unique identifier (
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(ByVal pError As ADODB.Error, _ adS
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that few records are affected and a
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adXactChaos (Default.) Cannot overw
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(adSchemaTables, Array(Empty, Empty
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Dim sTable As String sTable = lbTab
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Figure 7.6 Message from the data so
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A value of 0 specifies that there i
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• The Direction property is used
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To move through a set of records, y
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ByVal pRecordset As ADODB.Recordset
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adOpenStatic. If you will be perfor
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as an argument the number of record
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FileName argument is self-explanato
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OriginalValue property contains the
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ADO, RDO, and DAO are roughly analo
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it exploits enough different method
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"UID=Coriolis;PWD=Coriolis" Set aco
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You must modify the connection stri
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' Display the results With arsRepor
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Objects library to Microsoft Active
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lbTables(0).AddItem ars.Fields(1).V
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e automatically created (!). To use
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eing the data source of a Command o
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default caption. I did this for the
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4. Now, you will need to add naviga
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txtRaise(2) = deStoredProcedure.Com
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object’s name by prefixing it wit
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The DataReport object supports a nu
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Command object represents a band in
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ight-click on the Flexgrid control
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Select Case dir Case rsFirst rs.Mov
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ByVal pConnection As ADODB.Connecti
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If IsNull(rs(iRs).Fields(iCtr - iSt
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possible. In fact, the nature of VB
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To map the properties, select Proce
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object in component based developme
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If Len(first) = 0 Or Len(last) = 0
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Figure 10.2 Once you declare a refe
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Private Sub Graphics_PrintIt(Target
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The next example modifies the Print
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End Select End Sub I will show you
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sMsg = "The following errors were e
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Private WithEvents empCLSDemo As cl
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triggered. In that event, I invoke
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Why go to all this trouble? Figure
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object. In a sense, the class modul
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Optimizing Cross-Process Calls As n
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start it in a separate instance of
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this method remotely, and I was for
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.Height = (iIndex * 360) + 1850 .Sh
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All of the code in both the remote
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the data dictionary. I will then le
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number of solutions. Previous Table
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CTRY_NAME VARCHAR (35) NOT NULL, CO
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dd_desc VARCHAR (64), CONSTRAINT PK
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Public when the application opens:
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cannot take an Oracle stored proced
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efficient), I chose to use the sp_l
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' Command object for the stored pro
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End Function When ADO dynamically c
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RETURN ; END IF ; /* If country sta
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FROM data_dic WHERE dd_type = old_d
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Figure 11.3 The Data Dictionary Mai
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data type—its underlying data typ
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CommitTrans Else RollbackTrans End
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any money. At worst, it should at l
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update to Cindy failed but the upda
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UPDATE employee SET emp_salary = 50
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difficult to update. With XML, the
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Raining on and off throughout the
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library in your Visual Basic projec
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ReplaceNode Replaces one node with
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Public WithEvents DownloadTimer As
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Sunny and hot. Raining on a
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Of course, it would be useful to ge
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Recursion is a powerful programming
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Dim Index As Integer Dim tempNode A
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End Sub You could create a simple X
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Figure 12.4 A DTD makes it much eas
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The DTD is contained as part of th
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In addition to enumerated lists, th
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Skies will be clear and warm today,
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which relies heavily on line breaks
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&ALABAMA; &ALASKA; &ARIZONA; ... &W
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can also leverage the powers of DHT
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information, usually a structured s
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somewhat in sales. IIS introduced A
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client side scripting is fully visi
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happening than just the creation of
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Cookies A collection of cookies tha
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8. Select the WeatherSummary object
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for all these possible additional p
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• Query strings have a limit of 1
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eturns it as a formatted string. Fu
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The Daily Post As mentioned previou
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4. Double-click the weatherSubmitFo
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If Request.Form("Forecast")="" then
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shows the actual Web event connecti
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in the record are modified and then
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the list of all states, ordered by
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Response.Write "" Response.Write Re
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same format as a rainfall map. A We
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still using Internet Explorer 3.x a
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Figure 14.5 The standard Properties
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Figure 14.10). Notice that the docu
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The highlighted code in Listing 14.
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CtrlKey Boolean True if the Ctrl ke
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collections, many of which are cove
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ClearInterval(timerID as Long) Clea
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Prompt(msg as String, defaultStr as
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OuterText=textString OuterText=“T
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Mouse Data The STYLE=“positio
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as a or paragraph element, accumul
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Dim expn As String expn = TextData
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uffer = buffer + expn WriteLn = exp
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Dim rowOS as COStream 'Set the dest
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example, if you wish to retrieve th
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Dim cell As HTMLTableCell Dim row A
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While on the subject of the parentW
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Understanding Input Text boxes and
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High Temperature:° F Low Tempe
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For index = 0 To lbCtrl.Length - 1
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Exit For End If Next RS.Close conn.
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State = States.Value Set WeatherTab
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Scrollbars Built into containers Th
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A little searching reveals that, in
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Set opt = Document.createElement("O
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Figure 15.1 The Project Properties
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HSPACE=0 > 2. Create a new DHTML
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loop Img.loop=3 Indicates the numbe
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useMap Img.useMap=“#MyMap” Prov
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there are times (especially with We
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associating code as with ExecFuncti
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tools. The tag demonstrates both t
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style rules that you need, as shown
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posLeft, MyDiv.style.posLeft=20 Set
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This is some text This is anoth
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sheet’s rule. Listing 15.7 The Ge
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slt=document.parentWindow.confirm("
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Answer=window.showModalDialog(URL,a
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Visual Basic 6 includes two new use
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ibliography at the end of this chap
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The calendar object is de
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Comment.Value = Replace(RS("Comment
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goods at all stages of production,
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DEPT_LOC_ID CHAR (3) NOT NULL, DEPT
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ALTER TABLE LINE_ITEM ADD CONSTRAIN
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COMMIT, ROLLBACK, And LOCK ANSI SQL
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VAR returns the variance (the squar
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RDO is loaded instead. However, whe
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Level 2 Conformance Requirements
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objects, 374 proxy objects and, 18
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B Application Wizard, 125, 619 Appl
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C Bound controls, 202 Boyce-Code no
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doConnection object, 235 rdoResults
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Connection object, 278 parameters,
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Microsoft Jet and, 105 object cross
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QueryTimeOut property, 159 RecordsA
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Debug mode, 618 DECIMAL (38) data t
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E Documents collection, 138, 168-16
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F properties, 288 Source property,
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G FLOATING POINT data type, 46 Floa
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I Hello World application, 511-514,
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delegation, 122 reuse, 121-122 Inhe
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doResultset object, 245-246 RecordS
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N MIN function, 79, 80 Minimum ODBC
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O NodeValue property, 472 NoMatch p
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P OpenSchema method, 284, 324, 327-
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Q prop_type string, 148 prop_val st
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licensing fees, 35 Lotus Approach,
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doCreateEnvironment property (rdoEn
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doVersion property (rdoEngine objec
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ValidationText property, 196 Record
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S ResultChanged event (rdoResultset
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Snapshot-type record set, 189 SNF.
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T Strings, 45 XML attribute values
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U Connection object, 165 rdoConnect
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W RecordSet object, 196 TableDef ob
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X Type property, 151 UserName prope
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