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434 Day 12 Each component narrative consists of three sections: ■ A description of the component, its module, and class ancestor, as well as tables listing its key properties, methods, and events ■ A key elements section ■ A tasks section The key properties, methods, and events tables are by no means exhaustive—see the C++Builder documentation, or, better yet, the VCL source code, for complete lists of these. The idea is to give you a thorough baptism into the C++Builder database architecture without venturing into every nook and cranny of the VCL. TSession Module: DB Class ancestor: Tcomponent Because C++Builder automatically creates a TSession component for you each time your application runs, you won’t normally need to create one yourself. This built-in TSession can be referenced using C++Builder’s global Session variable. As a rule, you won’t need more than one TSession per application. The only exception to this is when you’re building multithreaded database applications. When doing that, you may need to use TSession components to open extra connections into your server in order to keep database access in one thread from interfering with that in another. You can drop as many TSession components as you need onto a form or data module and then utilize them in your Database and TDataset components. In a multithreaded database application, you typically set up one TSession per thread. Note that C++Builder defines another global variable, Sessions, for tracking multiple Session components in a single application. Sessions is of type TSessionList and contains an entry for each Session component in the application. Table 12.2 lists the key properties, Table 12.3 lists the key methods, and Table 12.4 lists the key events for TSession. Table 12.2. TSession key properties. Property Description DatabaseCount Returns a count of the number of active TDatabases. Databases Returns the array of active TDatabases. Handle Provides access to the BDE handle—used for direct BDE calls. KeepConnections Determines whether inactive connects are retained.
C++Builder Database Architecture Property Description NetFileDir Specifies the location of PDOXUSRS.NET. PrivateDir Specifies the location of temporary files. SessionName Specifies the session name to publish to other components. Table 12.3. TSession key methods. Method Function AddPassword Adds a password to the current session (for Paradox connections). CloseDatabase Explicitly closes a TDatabase component. DropConnections Drops all inactive TDatabase connections. FindDatabase Locates a TDatabase by name. GetAliasNames Returns the available BDE aliases. GetAliasParams Returns the parameters for a given alias. GetDatabaseNames Lists all available aliases, including local ones. GetDriverNames Lists the available BDE drivers. GetDriverParams Returns the parameters for a given driver. GetPassword Prompts for a password; returns true if successful. GetTableNames Lists all tables in a given database. GetStoredProcNames Lists all stored procedures in a given database. OpenDatabase Explicitly opens a TDatabase. RemoveAllPasswords Removes all Paradox-related passwords. RemovePassword Removes a given Paradox-related password. Table 12.4. TSession key events. Event Catalyst OnPassword Occurs when the BDE needs a Paradox table password. OnStartup Occurs when the session becomes active. 435 12
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At a Glance At A Glance WEEK 1 In W
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Day 1 Getting Your Feet Wet Week Ge
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Getting Your Feet Wet are divided i
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NOTE Getting Your Feet Wet As you m
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Getting Your Feet Wet but you need
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NOTE Getting Your Feet Wet In order
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NOTE Getting Your Feet Wet In C++,
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Getting Your Feet Wet An object, li
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Getting Your Feet Wet In some progr
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Listing 1.3. WRAPME.CPP. Getting Yo
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Getting Your Feet Wet Operator Desc
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NEW TERM Figure 1.5. Anatomy of a f
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SYNTAX ▼ ▲ Getting Your Feet We
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Getting Your Feet Wet Let’s prove
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NOTE Function Description Getting Y
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NOTE Getting Your Feet Wet numbers
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Quiz Getting Your Feet Wet Windows
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Day 2 Wading In Deeper Wading In De
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NOTE Wading In Deeper If the condit
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SYNTAX ▼ ▼ TIP TIP Wading In De
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SYNTAX Wading In Deeper immediately
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Listing 2.1. FORLOOP.CPP. Wading In
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SYNTAX ▼ ▲ SYNTAX ▼ ▲ The w
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Wading In Deeper for (int i=0;i
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▲ default: dflt_statements; break
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Wading In Deeper This code generate
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Workshop Wading In Deeper The Works
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Day 3 Up to Your Neck in C++ Up to
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Up to Your Neck in C++ Figure 3.1.
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Up to Your Neck in C++ That won’t
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Listing 3.2. REFERENC.CPP. Up to Yo
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Up to Your Neck in C++ Although it
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Quiz Up to Your Neck in C++ Day 5,
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Totally Immersed: C++ Classes and O
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C++ Class Frameworks and the Visual
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Exercises C++ Class Frameworks and
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The C++Builder IDE Explored: Projec
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Quiz The C++Builder IDE Explored: P
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Working with the Form Designer and
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In Review In Review WEEK 1 You cove
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In Review displayed based on user i
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At a Glance At A Glance WEEK 2 Are
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Day 8 VCL Components VCL Components
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VCL Components C++Builder displays
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VCL Components Important Common Pro
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Cursors VCL Components The Cursor p
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Figure 8.2. The Object Inspector sh
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VCL Components You can set this pro
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VCL Components Method Description I
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VCL Components Similarly, when the
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VCL Components or load the Memo wit
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VCL Components Item Applies To Desc
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VCL Components You can use owner-dr
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VCL Components Property Applies To
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VCL Components The GroupIndex Prope
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VCL Components The File Open and Fi
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Day 9 Creating Applications in C++B
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Figure 9.1. The Object Repository w
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Creating Applications in C++Builder
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TIP Creating Applications in C++Bui
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Figure 9.4. The Object Repository c
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Summary Creating Applications in C+
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More on Projects Day 10 More on Pro
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More on Projects The only time this
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TIP More on Projects You can add mo
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More on Projects Table 10.1. The Pr
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Figure 10.6. The Project Explorer s
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■ Forms ■ Application ■ C++
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Figure 10.9. The C++ page of the Pr
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More on Projects The Show warnings
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More on Projects The C++Builder Cod
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More on Projects menu or press Ctrl
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Quiz Building Internet Applications
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C++Builder Extensions to C++ Day 14
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C++Builder Extensions to C++ compil
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C++Builder Extensions to C++ you ca
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In Review In Review WEEK 2 Wow, tha
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Answers to Quiz Questions APPENDIX
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Day 3 Day 4 Answers to Quiz Questio
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Day 10 Answers to Quiz Questions 1.
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Symbols & (ampersands), 246 © (cop
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C C (programming language), 132 C c
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File Save, 309-312 Find/Replace, 31
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Insert Template, 248 Object Reposit
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Cascade( ), 198 Close( ), 198 Close
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object-oriented programming, see OO
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protected member functions, 106 pro
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structures arrays, 58 C vs. C++, 64
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A V I A C O M S E R V I C E The Inf
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Component Palette Quick Reference S
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Add to Your Sams Library Today with
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Overview Introduction Introduction
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Introduction VCL Explored .........
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