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

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Public Function GetInfo() as String GetInfo = "You pressed this button at " + Time$() End Function Products | Contact Us | About Us | Privacy | Ad Info | Home Previous Table of Contents Next Use of this site is subject to certain Terms & Conditions, Copyright © 1996-2000 EarthWeb Inc. All rights reserved. Reproduction whole or in part in any form or medium without express written permission of EarthWeb is prohibited. Read EarthWeb's privacy statement.
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 This example actually demonstrates two concepts: adding JavaScript into a VB application and calling a Visual Basic function from JavaScript. The first concept is straightforward—just because VB hooks into the Internet Explorer event queue doesn’t mean that you can’t still run scripts in Web pages. The script here illustrates that concept quite well. In general, if you have both a JavaScript event handler and a Visual Basic event handler for the same event, the JavaScript will be performed first. This is demonstrated by the second concept—you can call a VB function from JavaScript. There are two event handlers for the Enter image’s onclick event. The JavaScript handler calls a JavaScript function called Notify. Notify in turn references the DHTMLPage1 object, which has defined a GetInfo routine. That routine returns a string indicating when the button was pressed to the nearest second, which is displayed in a below the button. After you get past the ActiveX alert (which will be covered momentarily), then the Visual Basic onclick event is called. Although there is a lot that can be done with image manipulation in Visual Basic, in most circumstances you will be better off encapsulating mechanical functionality (such as buttons) in JavaScript code. By and large, these don’t need to be secured anyway. The danger of people looking through your source code comes in exposing your business logic, not multimedia functions.
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Brief Full Advanced Search Search T
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The Active Data Control Where To Go
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Index Products | Contact Us | About
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technology. We have kept our eye to
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people checked each piece of code.
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and sell through your Web site. (Tr
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grammatical correctness. Kris offer
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In this chapter, I introduce the un
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example, a “high-speed” Etherne
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which customers are from the state
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COM automatically “knows” how t
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little more than present forms, men
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Figure 1.4 The beginning of a simpl
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IBM’s Token Ring architecture run
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application to application. The IP
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Any database that organizes data in
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proper choice is highly dependent o
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equire the database to work too har
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You might want to consider the fina
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integrated well with XDB. The choic
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The columns correspond to fields in
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In this example, the database autom
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places, such as 1.25. An irrational
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key, we assign one to the Student_C
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Second normal form, usually abbrevi
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might want to consider selectively
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This example adds a column named Em
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(such as being only ‘M’ or ‘F
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Previous Table of Contents Next Pro
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query result. (I expanded upon this
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If your database does not provide a
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You can join together more than two
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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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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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Page 679 and 680: Dim cell As HTMLTableCell Dim row A
Page 683 and 684: While on the subject of the parentW
Page 687 and 688: Understanding Input Text boxes and
Page 689 and 690: High Temperature:° F Low Tempe
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Page 697 and 698: State = States.Value Set WeatherTab
Page 703 and 704: Scrollbars Built into containers Th
Page 707 and 708: A little searching reveals that, in
Page 709 and 710: Set opt = Document.createElement("O
Page 713 and 714: Figure 15.1 The Project Properties
Page 715 and 716: HSPACE=0 > 2. Create a new DHTML
Page 719 and 720: loop Img.loop=3 Indicates the numbe
Page 721 and 722: useMap Img.useMap=“#MyMap” Prov
Page 723 and 724: there are times (especially with We
Page 725: associating code as with ExecFuncti
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Page 731 and 732: style rules that you need, as shown
Page 735 and 736: posLeft, MyDiv.style.posLeft=20 Set
Page 737 and 738: This is some text This is anoth
Page 741 and 742: sheet’s rule. Listing 15.7 The Ge
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Page 745 and 746: Answer=window.showModalDialog(URL,a
Page 747 and 748: Visual Basic 6 includes two new use
Page 749 and 750: ibliography at the end of this chap
Page 751 and 752: The calendar object is de
Page 753 and 754: Comment.Value = Replace(RS("Comment
Page 755 and 756: goods at all stages of production,
Page 761 and 762: DEPT_LOC_ID CHAR (3) NOT NULL, DEPT
Page 763 and 764: ALTER TABLE LINE_ITEM ADD CONSTRAIN
Page 767 and 768: COMMIT, ROLLBACK, And LOCK ANSI SQL
Page 769 and 770: VAR returns the variance (the squar
Page 771 and 772: RDO is loaded instead. However, whe
Page 773 and 774: Level 2 Conformance Requirements
Page 775 and 776: 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
show all

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