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432 Day 12 Figure 12.2. Database access from the perspective of a C++Builder app. TQuery TDBGrid TDatabase TTable TDatasource TDBEdit TStoredProc TDBListBox ■ You do not need to use the TDatabase component to access databases. The TDatabase component provides some additional features and controls that you may or may not need, but it’s not required to build C++Builder database applications. ■ You will probably not access the TSession component unless you’re developing multithreaded database applications. A multithreaded application opens multiple execution “pipelines” simultaneously. This means that several operations can occur at the same time. Normal database applications are not multithreaded, so, as a rule, you won’t need to concern yourself with the TSession component. C++Builder automatically creates a TSession (stored in a global variable named Session) for database apps when they start up. This means that for single-threaded apps, you can just reference the Session variable when you need access to TSession’s properties or methods.
C++Builder Database Architecture ■ You do not need the TQuery or TStoredProc components unless you’re writing your own SQL or accessing server-based stored procedures. You can open database tables in any of the local or remote formats supported by C++Builder using just the TTable component. ■ You’ll normally use the TTable component to send/receive data from databases. As mentioned, TTable is the centerpiece of C++Builder’s database access. You use it to reference database tables and to exchange data with data-aware controls. ■ The components on the Data Controls page are visual, data-aware controls—they allow data to be displayed and allow users to change the data visually. They’re “data smart” versions of the controls you often see in Windows applications. You’ll use these components to build the user interface of database applications. They interact with data access controls such as TTable to provide users with database access. ■ TDataset descendants (for example, TTable, TQuery, and TStoredProc) retrieve data from databases, but they cannot supply this data directly to data-aware components (such as TDBEdit); they need TDatasource to function as the conduit between them and your application’s data-aware controls. This means that data-aware components such as TDBEdit do not refer directly to the TDataset that provides their data access. Instead, they reference a TDatasource that, in turn, references a TDataset. ■ So, to build a simple data-aware form you need three things: a TTable, a TDatasource, and whatever data-aware controls the form requires (TDBEdit, TDBMemo, and so on). A Tour of the C++Builder Database Components Now that you’ve received a basic overview of the C++Builder database architecture, let’s cover the components individually. I’ll go through C++Builder’s database components one by one and discuss the key elements of each. I’ll build on the general discussion of the database architecture by giving you a thorough tour of the C++Builder database components that encompass it. I’ve intentionally omitted components that act only as support classes. If a class is not actually a component—that is, if it’s merely an ancestor of a component—I don’t include it. This includes the TDataset and TDBDataSet classes, for example. They’re class ancestors of the TTable, TQuery, and TStoredProc components. My emphasis here is on components that you can manipulate using C++Builder’s visual tools. Although the ancestor class hierarchy is important, most of the properties, events, and methods you’ll need to be aware of are provided in C++Builder’s components by design. 433 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 but you need
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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 Operator Desc
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NEW TERM Figure 1.5. Anatomy of a f
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Day 2 Wading In Deeper Wading In De
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SYNTAX ▼ ▼ TIP TIP Wading In De
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SYNTAX Wading In Deeper immediately
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▲ default: dflt_statements; break
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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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Totally Immersed: C++ Classes and O
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Exercises C++ Class Frameworks and
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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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VCL Components You can set this pro
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Day 9 Creating Applications in C++B
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Creating Applications in C++Builder
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TIP Creating Applications in C++Bui
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Summary Creating Applications in C+
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More on Projects Table 10.1. The Pr
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■ Forms ■ Application ■ C++
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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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In Review In Review WEEK 2 Wow, tha
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Answers to Quiz Questions APPENDIX
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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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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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