idle recent projects in the three tiers of it. Say something concrete things. I hated most space reasons. Online reason too many, and do not like the examples given. Most articles are more or less referred to the three-tier structure. Layer said, the business layer, data layer. Again business layer breakdown divided into exterior layer services, the main business services, library services and database layer. Today, business-to discuss it. For the most simple example. Client access to data.

最新三层架构设计源码
....................\DELPHI三层架构设计方案.doc
....................\NewCard
....................\.......\CheckMem.dcu
....................\.......\CheckMem.pas
....................\.......\Client
....................\.......\......\BusinessObj
....................\.......\......\...........\Clear.bat
....................\.......\......\...........\CompanyVO.pas
....................\.......\......\...........\UserVO.pas
....................\.......\......\CardClient.cfg
....................\.......\......\CardClient.dof
....................\.......\......\CardClient.dpr
....................\.......\......\CardClient.exe
....................\.......\......\CardClient.res
....................\.......\......\CardMainFrm.dfm
....................\.......\......\CardMainFrm.pas
....................\.......\......\Clear.bat
....................\.......\......\ConnServer.ini
....................\.......\......\DAOObject
....................\.......\......\.........\Clear.bat
....................\.......\......\.........\DAOValueObjectUnit.pas
....................\.......\......\.........\IValueObjectListUnit.pas
....................\.......\......\.........\TValueObjectListUnit.pas
....................\.......\......\.........\ValueObjectUnit.pas
....................\.......\......\DataPersistent
....................\.......\......\..............\CardServer_TLB.pas
....................\.......\......\..............\Clear.bat
....................\.......\......\..............\DataPersistentUnit.pas
....................\.......\......\..............\IDataPersistentUnit.pas
....................\.......\......\DataStructureUnit.pas
....................\.......\......\DeptFrm.dfm
....................\.......\......\DeptFrm.pas
....................\.......\......\DLLDataPersistent.dll
....................\.......\......\DMFrm.dfm
....................\.......\......\DMFrm.pas
....................\.......\......\MainControlFrm.dfm
....................\.......\......\MainControlFrm.pas
....................\.......\......\Modul
....................\.......\......\.....\BasFrm.dfm
....................\.......\......\.....\BasFrm.pas
....................\.......\......\.....\Clear.bat
....................\.......\......\pic





....................\.......\......\ProjectGroup1.bpg
....................\.......\......\ProjectGroup1.~bpg
....................\.......\......\Public
....................\.......\......\......\Clear.bat
....................\.......\......\......\PublicFuncUnit.pas
....................\.......\......\ResourceStrUnit.pas

....................\.......\......\test
....................\.......\......\....\Clear.bat
....................\.......\......\....\Unit1.dfm
....................\.......\......\....\Unit1.pas
....................\.......\......\ToolBasFrm.dfm
....................\.......\......\ToolBasFrm.pas
....................\.......\DAOOleVariant.pas
....................\.......\DLL
....................\.......\...\IBODataPersistent
....................\.......\...\.................\BODataPersistentUnit.pas
....................\.......\...\.................\CardServer_TLB.pas
....................\.......\...\.................\Clear.bat
....................\.......\...\.................\DLLBODataPersistent.cfg
....................\.......\...\.................\DLLBODataPersistent.dof
....................\.......\...\.................\DLLBODataPersistent.dpr
....................\.......\...\.................\DLLBODataPersistent.res
....................\.......\...\.................\IBODataPersistentUnit.pas
....................\.......\...\IDataPersistent
....................\.......\...\...............\CardServer.tlb
....................\.......\...\...............\CardServer_TLB.pas
....................\.......\...\...............\Clear.bat
....................\.......\...\...............\DataPersistentUnit.pas
....................\.......\...\...............\DLLDataPersistent.cfg
....................\.......\...\...............\DLLDataPersistent.dll
....................\.......\...\....

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