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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 Triggers And Stored Procedures A trigger is a small program that is stored on the database and defined to run automatically as a result of a database action, such as an insert or update of a certain table. The program consists of SQL statements plus RDBMS-specific extensions. For instance, a trigger written for an Oracle database is created using PL/SQL. A stored procedure is similar to a trigger except that it runs when called by a trigger, another stored procedure, or your program. The advantage of triggers and stored procedures is that they can move a good deal of business logic onto the server. For example, you might want the ZIP code to be validated every time an address is updated. This is an ideal candidate for a trigger that is tied to the address table and defined to run any time a row is updated or inserted. Implementing this rule as a trigger both reduces network traffic and relieves the client program of the burden of performing this edit. Because each RDBMS uses different SQL dialects, the syntax for triggers and stored procedures is highly variable. Nevertheless, later in the book I introduce some examples to show how triggers and stored procedures are used by your Visual Basic programs. Data Control Language Data Control Language (DCL) consists of two commands that control who has access to what objects on the database. By definition, the database administrator (DBA) has authorization to all objects. Beyond that, if you want to give another user access to an object that you created, you must specifically grant him or her permission.
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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
Page 29 and 30: Figure 1.4 The beginning of a simpl
Page 31 and 32: Brief Full Advanced Search Search T
Page 33 and 34: IBM’s Token Ring architecture run
Page 35 and 36: application to application. The IP
Page 41 and 42: Any database that organizes data in
Page 43 and 44: proper choice is highly dependent o
Page 47 and 48: equire the database to work too har
Page 49 and 50: You might want to consider the fina
Page 53 and 54: integrated well with XDB. The choic
Page 55 and 56: The columns correspond to fields in
Page 59 and 60: In this example, the database autom
Page 61 and 62: places, such as 1.25. An irrational
Page 65 and 66: key, we assign one to the Student_C
Page 69 and 70: Second normal form, usually abbrevi
Page 71 and 72: might want to consider selectively
Page 75 and 76: This example adds a column named Em
Page 79: (such as being only ‘M’ or ‘F
Page 83 and 84: Previous Table of Contents Next Pro
Page 85 and 86: query result. (I expanded upon this
Page 89 and 90: If your database does not provide a
Page 93 and 94: You can join together more than two
Page 97 and 98: SELECT EMP_NO AS 'NUMBER', EMP_LNAM
Page 101 and 102: FROM EMPLOYEE The result is: MIN(EM
Page 103 and 104: GENEVIEVE WESLEY The LTRIM function
Page 105 and 106: (15, 2) returns 1 because 15 divide
Page 107 and 108: SELECT SUM(EMP_SALARY) FROM EMPLOYE
Page 109 and 110: 300 66958.36 400 53983.02 You can n
Page 111 and 112: ORDER BY EMP_DEPT_NO The output of
Page 113 and 114: SELECT EMP_NO, EMP_FNAME, EMP_LNAME
Page 119 and 120: the ODBC API as a means of database
Page 121 and 122: DAO/Jet * 4 7 5 6 DAO/ODBCDirect Da
Page 125 and 126: Listing 4.1 opens three files (in A
Page 129 and 130: 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
Page 709 and 710:
Set opt = Document.createElement("O
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Figure 15.1 The Project Properties
Page 715 and 716:
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
Page 805 and 806:
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,
Page 813 and 814:
doCreateEnvironment property (rdoEn
Page 815 and 816:
doVersion property (rdoEngine objec
Page 817 and 818:
ValidationText property, 196 Record
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S ResultChanged event (rdoResultset
Page 821 and 822:
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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