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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>構(gòu)建數(shù)據(jù)庫(kù)模式來(lái)支持類</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 9 頁(yè)（共15 頁(yè)）</nobr></font></td>
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<p>有了一些 JDO 實(shí)現(xiàn)，您可能需要構(gòu)建數(shù)據(jù)庫(kù)來(lái)支持持久性對(duì)象。您很可能有自動(dòng)執(zhí)行此過(guò)程的工具。我們的 LiDO 版提供了構(gòu)建數(shù)據(jù)庫(kù)模式的命令行工具。只須重用我們上一步構(gòu)建的元數(shù)據(jù)，并且給出數(shù)據(jù)庫(kù)驅(qū)動(dòng)程序的名稱（在本例中是 MM.MySQL 驅(qū)動(dòng)程序）以及將數(shù)據(jù)庫(kù)標(biāo)識(shí)到驅(qū)動(dòng)程序的 URI。正如前面提到的，在運(yùn)行這個(gè)命令之前需要?jiǎng)?chuàng)建 <code>jdotut</code> 數(shù)據(jù)庫(kù)。在 MySQL 管理控制臺(tái)內(nèi)可以創(chuàng)建數(shù)據(jù)庫(kù)。</p>
<p>運(yùn)行下列命令以創(chuàng)建數(shù)據(jù)庫(kù)模式：</p>
<pre>
<code style="font-family: Courier New, Courier, monospace; font-size: 12">
java com.libelis.lido.ds.jdbc.DefineSchema
         -driver org.gjt.mm.mysql.Driver
         -database jdbc:mysql://localhost/jdotut
         -metadata metadata.jdo
</code>
</pre>
<p>運(yùn)行該命令后，您就會(huì)有一張表，可以存儲(chǔ)我們創(chuàng)建的任何具有持久性的地址。源代碼中的批處理文件 defineschema.bat 中包含了這個(gè)命令。</p>
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