官網軟件下載可能過慢，以下為我的分享：

db4o-8.0-java.zip (包含db4o的API及jar包，以及OME插件等)：?http://pan.baidu.com/s/1gdBx13X

Eclipse分享（適合OME插件的Eclipse版本）：http://pan.baidu.com/s/1kTEDgf9

Welcome

db4o?is?the?native?Java,?.NET?and?Mono?open?source?object?database.

db4o是本地的Java，.NET和Mono的開源對象數據庫.

This?tutorial?was?written?to?get?you?started?with?db4o?as?quickly?as?possible.?Before?you?start,?please?make?sure?that?you?have?downloaded?the?latest?db4o?distribution?from?the?db4objects?website.

寫這份指南是為了讓你能夠對db4o盡快上手。在開始之前，請首先確保你已經從db4objects的網站上下載了最新的db4o發行包。

developer.db4o.com

You?are?invited?to?join?the?db4o?community?in?the?public?db4o?forums?to?ask?for?help?at?any?time.

你被邀請加入db4o社區的公共論壇，在那里可以隨時請求幫助。

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Links

In?order?to?access?free?developer?resources?you?may?want?to?register?on?db4o?developer?website.

Feel?free?register?to?the?forums?http://www.db4o.com/Users/register.aspx.

為了可以訪問免費的開發者資源，你可能需要在db4o開發者網站上要注冊一個賬號，論壇的注冊網址為：http://www.db4o.com/Users/register.aspx

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And?here?are?some?further?links?on?developer.db4o.com?that?you?may?find?useful:

下面是一些?developer.db4o.com?上的一些可能對你比較有用的鏈接：

All?Downloads

SVN?Repository

Community?Projects

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Download?Contents(下載內容)

The?db4o?Java?distribution?comes?as?one?zip?file,?db4o-8.0-java.zip.?When?you?unzip?this?file,?you?get?the?following?directory?structure:

db4o的Java發布版本是以一個zip文件（db4o-8.0-java.zip）的形式進行發布的。解壓縮這個文件后，你將獲得下面的目錄結構：

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Please?take?a?look?at?all?the?supplied?documentation?formats?to?choose?the?one?that?works?best?for?you:

.請看一下所有的文檔格式，選擇一個最適合你的：

db4o-8.0/doc/api/index.html

The?API?documentation?for?db4o?is?supplied?as?JavaDocs?HTML?files.?While?you?read?through?this?tutorial?it?may?be?helpful?to?look?into?the?API?documentation?occasionally.

db4o的API文檔以JavaDocs的HTML文件格式提供。當你閱讀這份指南的時候，偶爾翻閱一下這個API文檔是很有幫助的。

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db4o-8.0/doc/reference/index.html

The?reference?documentation?is?a?complete?compilation?for?experienced?db4o?users.

參考文檔是對有經驗的db4o用戶來說是一個完整的編輯物。

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db4o-8.0/doc/tutorial/index.html

This?is?the?interactive?HTML?tutorial.?Examples?can?be?run?"live"?against?a?db4o?database?from?within?the?browser.?In?order?to?use?the?interactive?functionality?a?Java?JRE?1.3?or?above?needs?to?be?installed?and?integrated?into?the?browser.?Java?security?settings?have?to?allow?applets?to?be?run.?If?you?have?problems?using?the?interactive?functionality,?please?refer?to?Tutorial?Troubleshooting.

這是交互式的HTML的指南。示例可以依靠一個db4o數據庫在瀏覽器上實時運行。為了使用交互功能：你需要安裝一個1.3或更新版本的JRE并把它集成到瀏覽器里。Java的安全設置必須允許運行applet，如果你在使用交互功能的時候遇到了問題，請參考指南的Tutorial?Troubleshooting?部分。

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db4o-8.0/doc/tutorial/db4o-8.0-tutorial.pdf

The?PDF?version?of?the?tutorial?allows?best?fulltext?search?capabilities.

這份PDF版本的指南很好的支持全文檢索功能。

1.?First?Glance?（開始前的了解）

Before?diving?straight?into?the?first?source?code?samples?let's?get?you?familiar?with?some?basics.

在進入第一個示例代碼之前，讓我們先了解一些必要的基礎知識。

1.1.?The?db4o?engine?（db4o引擎）

The?db4o?object?database?engine?consists?of?one?single?core?jar?file.?In?addition?you?may?want?to?use?client/server?library?or?optional?components.?You?may?also?get?it?all?in?a?single?jar?"db4o-all":

do4o對象數據庫引擎由一個Jar文件組成。另外你可能想要使用客戶機/服務器庫或可選組件，其實你都可以在一個jar包（?db4o-all）中得到你想要的。

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db4o-8.0-core-java1.1.jar

will?run?with?most?Java?JDKs?that?supply?JDK?1.1.x?functionality?such?as?reflection?and?Exception?handling.?That?includes?many?IBM?J9?configurations,?Symbian?and?Savaje.

運行在大部分支持JDK1.1特性（如反射及異常處理）的java?JDK，其中包括了一些IBM?J9?configurations,Symbian?和?Savaje。

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db4o-8.0-core-java1.2.jar

is?built?for?all?Java?JDKs?between?1.2?and?1.4.

用于1.2?至1.4?版本的Java?JDK。

db4o-8.0-core-java5.jar

is?built?for?Java?JDK?5?and?JDK?6

用于1.5?至1.6?版本的Java?JDK。

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If?you?intend?to?use?client/server?version?of?db4o?you?will?additionally?need?client/server?library

如果你想要使用客戶端/服務器版本的db4o，你可能需要額外的一些客戶端/服務器的包

matching?your?JDK?version（對應你的jdk版本）:

db4o-8.0-cs-java1.1.jar

db4o-8.0-cs-java1.2.jar

db4o-8.0-cs-java5.jar

Some?advanced?functionality?such?as?cluster?support,?platform-specific?IO?adapters,

statistic?tools?etc?can?be?added?by?including?db4o?optional?library:

一些高級的功能，例如集群支持，特定于平臺的IO適配器，統計工具等也可以通過添加db4o可選包支持。

db4o-8.0-optional-java1.1.jar

db4o-8.0-optional-java1.2.jar

db4o-8.0-optional-java5.jar

You?can?also?get?all?of?the?above?in?a?single?jar:

你也可以通過一個jar包，獲得以上所有的功能支持。

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db4o-8.0-all-java1.1.jar

db4o-8.0-all-java1.2.jar

db4o-8.0-all-java5.jar

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1.2.?Installation（安裝）

If?you?add?one?of?the?above?db4o-*.jar?files?to?your?CLASSPATH?db4o?is?installed.?For?beginners?it?is?recommended?to?use?"db4o-all"?library?to?avoid?confusion?with?the?location?of?certain?classes.?In?case?you?work?with?an?integrated?development?environment?like?Eclipse?you?would?copy?the?db4o-*.jar?to?the?/lib/?folder?under?your?project?and?add?db4o?to?your?project?as?a?library.

只要把上面的?db4o-*.jar中的某個添加到CLASSPATH中，就算完成了db4o的安裝。初學者建議使用“db4o-all”庫,以避免對于某些類的位置混淆。假如你使用像Eclipse這樣的IDE，那么就應該把?db4o-*.jar復制到項目文件夾中的lib目錄下，并把db4o作為一個代碼庫加到你的項目當中。

1.3.?Object?Manager?Enterprise?installation(OME)

Object?Manager?Enterprise?(OME)?is?an?object?browser?for?db4o?databases.?OME?installation?can?be?found?in?/ome?folder?of?the?distribution.?The?zip?file?in?this?folder?contains?the?Eclipse?plugin?version?of?OME.

OME是db4o數據庫的一個對象瀏覽器，它的安裝可以在/ome文件夾下的介紹中找到，這個文件夾下的zip壓縮文件包含了Eclipse的OME插件版本。

To?install?the?plugin,?you?need?to?have?a?version?of?Eclipse?>=?3.3?installed.?Unzip?the?file?to?a?folder?of?your?choice.?Then?open?Eclipse,?select?'Help'?->?'Software?Updates...'?->?'Available?Software'?from?the?menu.?Choose?'Add?Site...'?->?'Local...'?and?select?the?unzipped?folder.?Follow?the?Eclipse?Update?Manager?instructions?for?the?OME?feature?from?here?on.

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插件的安裝，你壓根安裝一個版本在3.3以上的Eclipse，然后把文件解壓到你指定的目錄，打開?Eclipse，在菜單欄選擇'Help'?->?'Software?Updates...'?->?'Available?Software'?，選擇'Add?Site...'?->?'Local...'?，然后選擇解壓的文件，在這里遵循Eclispe對于OME特性的更新管理指令。

The?actual?menu?structure?may?vary?over?Eclipse?versions.?(The?above?applies?to?Eclipse?3.4?Ganymede.)?When?in?doubt,?please?refer?to?the?Eclipse?documentation?on?Software?Updates.

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Alternatively,?you?can?install?the?plugin?manually?by?simply?copying?the?contents?of?the?'plugins'?and?'features'?folders?from?the?unzipped?folder?to?the?corresponding?subfolders?in?the?root?folder?of?your?Eclipse?installation.

實際的菜單結構在Eclipse版本可能會有所不同。(以上適用于Eclipse?3.4?Ganymede)。如果有疑問,請參閱Eclipse文檔軟件更新。

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1.4.?API?Overview（API預覽）

Do?not?forget?the?API?documentation?while?reading?through?this?tutorial.?It?provides?an?organized?view?of?the?API,?looking?from?a?java?package?perspective?and?you?may?find?related?functionality?to?the?theme?you?are?currently?reading?up?on.

For?starters,?the?java?packages?com.db4o?and?com.db4o.query?are?all?that?you?need?to?worry?about.

請在閱讀本指南的時候，不要忘記API文檔。它從Java包（package）的角度出發提供了有組織的API視圖，你可以在閱讀本指南的同時使用它方便地找到與主題相關的功能。

首先，com.db4o、com.db4o.query是我們所需要關心的。

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com.db4o

The?com.db4o?java?package?contains?almost?all?of?the?functionality?you?will?commonly?need?when?using?db4o.?Two?objects?of?note?are?com.db4o.Db4oEmbedded,?and?the?com.db4o.ObjectContainer?interface.

com.db4o包含了幾乎所有通常所需要用到的功能。其中有兩個值得留意的接口：com.db4o.Db4o和com.db4o.ObjectContainer。

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The?com.db4o.Db4o?factory?is?your?starting?point.?Static?methods?in?this?class?allow?you?to?open?a?database?file?and?create?an?initial?configuration.?For?client/server?environment?you?will?need?to?use?com.db4o.cs.Db4oClientServer?factory?class?to?start?a?server,?or?connect?to?an?existing?server,?but?this?will?be?discussed?later?,?start?a?server,?or?connect?to?an?existing?server.?The?most?important?interface,?and?the?one?that?you?will?be?using?99%?of?the?time?is?com.db4o.ObjectContainer:?This?is?your?db4o?database.

而com.db4o.Db4o工廠類是我們進行開發的起始點，該類的靜態方法提供了打開數據庫文件、創建初始化的配置的功能。對于客戶端/服務器的環境，你可能需要用com.db4o.cs.Db4oClientServer工廠類來啟動服務或者連接到已有的服務器的功能，這將會稍后討論。com.db4o.ObjectContainer是一個99%的時間都會用到的、最重要的接口：在開發過程中，它就是你的db4o數據庫。

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-?An?ObjectContainer?can?either?be?a?database?in?single-user?mode?or?a?client?connection?to?a?db4o?server.

-?Every?ObjectContainer?owns?one?transaction.?All?work?is?transactional.?When?you?open?an?ObjectContainer,?you?are?in?a?transaction,?when?you?commit()?or?rollback(),?the?next?transaction?is?started?immediately.

-?Every?ObjectContainer?maintains?it's?own?references?to?stored?and?instantiated?objects.?In?doing?so,?it?manages?object?identities,?and?is?able?to?achieve?a?high?level?of?performance.

-?ObjectContainers?are?intended?to?be?kept?open?as?long?as?you?work?against?them.?When?you?close?an?ObjectContainer,?all?database?references?to?objects?in?RAM?will?be?discarded.?

-?ObjectContainer可以作為單用戶模式的數據庫，也可以作為db4o服務器的客戶端連接。
-?每個ObjectContainer持有一個事務，所有的操作都是事務相關的。?當你打開一個ObjectContainer時?，事務已經開始了，當你commit()或者rollback()，它將會馬上啟動下一個事務。
-?每個ObjectContainer會自己管理那些被其存儲并實例化的對象的引用。而做這些工作的同時，它還管理這對象的唯一標識，這樣是它能夠達到很高的性能。
-?在使用ObjectContainer的過程中，只要你還在使用它，它就會一直保持打開狀態。而當你關閉這個ObjectContainers時，所有保存在內存中的對象引用都將被丟棄掉。

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com.db4o.ext

In?case?you?wonder?why?you?only?see?very?few?methods?in?an?ObjectContainer,?here?is?why:?The?db4o?interface?is?supplied?in?two?steps?in?two?java?packages,?com.db4o?and?com.db4o.ext?for?the?following?reasons:

也許你會問為什么ObjectContainer里面只有那么少的方法，原因是將db4o接口被分別放置在com.db4o和com.db4o.ext這兩個包中，這么做是為了：

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-?It's?easier?to?get?started,?because?the?important?methods?are?emphasized.

-?It?will?be?easier?for?other?products?to?copy?the?basic?db4o?interface.

-?It?is?an?example?of?how?a?lightweight?version?of?db4o?could?look.

-?便于快速開始，因為重要的方法都在ObjectContainer中被強調了。

-?其他產品更容易復制db4o的基本接口。

-?很好地展現了一個db4o的輕量級版本。

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Every?com.db4o.ObjectContainer?object?is?also?an?com.db4o.ext.ExtObjectContainer.?You?can?cast?it?to?ExtObjectContainer?or?you?can?use?the?method?to?get?to?the?advanced?features.

每個com.db4o.ObjectContainer對象同時也是一個com.db4o.ext.ExtObjectContainer對象。你可以把它轉換成ExtObjectContainer，或者可以使用方法來獲得更高級的特性。

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com.db4o.config

The?com.db4o.config?java?package?contains?types?and?classes?necessary?to?configure?db4o.?The?objects?and?interfaces?within?are?discussed?in?the?Configuration?section.

com.db4o.config包里面包含了配置db4o所需的類型和類，我們將在配置章節中討論它的對象和接口。

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com.db4o.query

The?com.db4o.query?java?package?contains?the?Predicate?class?to?construct?Native?Queries.?The?Native?Query?interface?is?the?primary?db4o?querying?interface?and?should?be?preferred?over?the?Soda?Query?API.

com.db4o.query包中包含了用來構造原生查詢的Predicate類。Native?Query接口是db4o最主要的查詢接口，并且它應該比Soda查詢API更常用。

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db4o_8.0對象數據庫官方文檔翻譯_學習筆記二：

http://blog.csdn.net/oceans521/article/details/43194621

總結

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