Hibernate 5.x版本中SchemaExport的用法_hibernate schemaexport-优快云博客

Hibernate 5.x的版本中，SchemaExport的用法不同于以前的版本，而网上的诸多资料都还停留在以前的3.x， 4.x的API中，这里我简单说一下5.x版本中SchemaExport的用法。分别在5.0.1.Final版本、及5.1.0.Final版本中亲测有效。

一、5.0.1.Final

这个版本中的SchemaExport的API相对较复杂。参考如下：

<code class="hljs d has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">ServiceRegistry serviceRegistry = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> StandardServiceRegistryBuilder().configure().build();

MetadataImplementor metadataImplementor = (MetadataImplementor)
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> MetadataSources(serviceRegistry).buildMetadata();

SchemaExport <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">export</span> = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> SchemaExport(serviceRegistry, metadataImplementor);
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">export</span>.create(<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">true</span>);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li></ul>

PS：上述代码片段，是本人之前在知乎中的回答，应该不算侵权。如下：
https://www.zhihu.com/question/35168658

二、5.1.0.Final

知乎上有童鞋反应上述代码片段不能正常使用，本人特意去看了一下最新的5.1.0.Final的版本，发现SchemaExport的API又改了。@_@改得真频繁。
新版本的API使用参考如下：

<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.configure</span>()<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.build</span>()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
Metadata metadata = new MetadataSources(serviceRegistry)<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.buildMetadata</span>()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
SchemaExport schemaExport = new SchemaExport()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>
schemaExport<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.create</span>(EnumSet<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.of</span>(TargetType<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.DATABASE</span>), metadata)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li></ul>

也就是说，create的时候，通过TargetType类型的一个EnumSet，来控制SQL语句的去处。TargetType是一个枚举类型，定义如下：

<code class="hljs java has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">enum</span> TargetType {
    <span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
     * Export to the database.
     */</span>
    DATABASE,
    <span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
     * Write to a script file.
     */</span>
    SCRIPT,
    <span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/**
     * Write to {@link System#out}
     */</span>
    STDOUT;
}</code>