105 lines
11 KiB
HTML
105 lines
11 KiB
HTML
<!DOCTYPE html>
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<html lang="en-us">
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<head>
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<meta charset="UTF-8">
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<title>RedKale - Java 开源框架</title>
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<link rel="stylesheet" type="text/css" href="stylesheets/normalize.css" media="screen">
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<link rel="stylesheet" type="text/css" href="stylesheets/stylesheet.css" media="screen">
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<link rel="stylesheet" type="text/css" href="stylesheets/github-light.css" media="screen">
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<link rel="stylesheet" type="text/css" href="stylesheets/highlight.css" media="screen">
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</head>
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<body>
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<section class="page-header">
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<a href="index.html" class="project-name">RedKale</a>
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<h2 class="project-tagline"></h2>
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<a href="redkale.html" class="btn">RedKale 入门</a>
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<a href="convert.html" class="btn">Convert 组件</a>
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<a href="service.html" class="btn">Service 组件</a>
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<a href="source.html" class="btn">Source 组件</a>
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<a href="net.html" class="btn">Net 组件</a>
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<a href="watch.html" class="btn">Watch 组件</a>
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<a href="javadoc/index.html" target="_blank" class="btn">Javadoc API</a>
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<a href="https://github.com/wentch/redkale" target="_blank" class="btn">Github 源码</a>
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</section>
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<section class="main-content">
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<h3><a id="source_intro" class="anchor" href="#" aria-hidden="true"><span class="octicon octicon-link"></span></a>Source 组件介绍</h3>
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<p> Source 提供两种类型的数据源：DataSource 和 CacheSource。DataSource 为数据库或内存数据库，提供类似JPA、Hibernate的接口与功能。CacheSource 为缓存数据提供类似Memcached、Redis的接口和功能。两者也提供了异步接口(基于<a href="service.html#service_remote" target="_blank">远程模式Service</a>)。<br/></p>
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<h3><a id="datasource_study" class="anchor" href="#" aria-hidden="true"><span class="octicon octicon-link"></span></a>DataSource 入门</h3>
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<p>
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与JPA相比，DataSource有以下几个特点：<br/>
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1、简易的过滤查询接口，但仅支持简单的表关联查询。 <br/>
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2、分布式的主键的分布式自增策略。 <br/>
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3、动态更新变更后的数据库连接参数。 <br/>
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4、读写分离的简易配置。 <br/>
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5、进程间的缓存会自动同步。 <br/>
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为了降低学习成本，DataSource重用了JPA里的部分注解与配置文件，使用方法基本相同，与JPA用法唯一区别是注解只能标记于字段，不能标记在方法上。
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</p>
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<table style="margin: auto;">
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<tr><th>注 解</th><th>描 述</th></tr>
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<tr><td style="text-align: left;">javax.persistence.Cacheable</td><td>标记Entity类是否需要缓存，与JPA用法一致</td></tr>
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<tr><td style="text-align: left;">javax.persistence.Column</td><td>标记字段，只使用其name()、insertable()、updatable()属性</td></tr>
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<tr><td style="text-align: left;">javax.persistence.Entity</td><td>JPA的Entity类必须标记为@Entity, 而RedKale不强制要求，所以该注解一般无用</td></tr>
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<tr><td style="text-align: left;">javax.persistence.GeneratedValue</td><td>仅用于标记主键是否为数据库自增长，其内值的两属性废弃</td></tr>
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<tr><td style="text-align: left;">javax.persistence.GenerationType</td><td>被@GeneratedValue的属性引用，在RedKale内不被使用到</td></tr>
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<tr><td style="text-align: left;">javax.persistence.Id<td>标记主键字段，与JPA用法一致</td></tr>
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<tr><td style="text-align: left;">javax.persistence.Table<td>标记表的别名，与JPA用法一致</td></tr>
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<tr><td style="text-align: left;">javax.persistence.Transient<td>标记是否为表对应的字段，与JPA用法一致</td></tr>
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<tr><td style="text-align: center;font-size: 0.9rem;" colspan="2"><b>以下是RedKale自定义的注解</b></td></tr>
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<tr><td style="text-align: left;"><b>@VirtualEntity</b></td><td>用于非数据库表对应的Entity类，且仅用于开启缓存模式的DataSource</td></tr>
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<tr><td style="text-align: left;"><b>@DistributeGenerator</b></td><td>标记主键是否采用分布式自增长策略，不能与@GeneratedValue同用</td></tr>
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<tr><td style="text-align: left;"><b>@DistributeTables</b></td><td>当多个表的主键唯一性公用时需要该注解</td></tr>
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<tr><td style="text-align: left;"><b>@FilterColumn</b></td><td>用于FilterBean过滤类的字段设置</td></tr>
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<tr><td style="text-align: left;"><b>@FilterJoinColumn</b></td><td>用于FilterBean过滤类的关联表字段设置</td></tr>
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<tr><td style="text-align: left;"><b>@FilterGroup</b></td><td>用于FilterBean过滤类的过滤条件分组设置</td></tr>
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</table>
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<p>未完待续…… <br/>
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</p>
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<h3><a id="source_confxml" href="#" aria-hidden="true"><span class="octicon octicon-link"></span></a>persistence.xml 配置说明</h3>
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<div class="highlight"><pre><span class="c"><!-- 其配置算是标准的JPA配置文件的缩略版 --></span>
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<span class="nt"><persistence></span>
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<span class="c"><!-- 系统基本库 --></span>
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<span class="nt"><persistence-unit</span> <span class="na">name=</span><span class="s">"demouser"</span><span class="nt">></span>
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<span class="c"><!-- 为NONE表示不启动缓存，@Cacheable 失效； 非NONE值(通常用ALL)表示开启缓存。 --></span>
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<span class="nt"><shared-cache-mode></span>NONE<span class="nt"></shared-cache-mode></span>
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<span class="nt"><properties></span>
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<span class="nt"><property</span> <span class="na">name=</span><span class="s">"javax.persistence.jdbc.url"</span> <span class="na">value=</span><span class="s">"jdbc:mysql://127.0.0.1:3306/dbuser?characterEncoding=utf8"</span><span class="nt">/></span>
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<span class="c"><!-- </span>
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<span class="c"> javax.persistence.jdbc.driver在JPA的值是JDBC驱动，RedKale有所不同，值应该是javax.sql.DataSource的子类。 </span>
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<span class="c"> 为了兼容用户习惯，RedKale内置常见JDBC驱动到javax.sql.DataSource的映射关系：</span>
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<span class="c"> com.mysql.jdbc.Driver —————— com.mysql.jdbc.jdbc2.optional.MysqlConnectionPoolDataSource</span>
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<span class="c"> org.mariadb.jdbc.Driver —————— org.mariadb.jdbc.MySQLDataSource</span>
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<span class="c"> oracle.jdbc.driver.OracleDriver —————— oracle.jdbc.pool.OracleConnectionPoolDataSource</span>
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<span class="c"> com.microsoft.sqlserver.jdbc.SQLServerDriver —————— com.microsoft.sqlserver.jdbc.SQLServerConnectionPoolDataSource</span>
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<span class="c"> 因此 com.mysql.jdbc.Driver 会被自动转换成 com.mysql.jdbc.jdbc2.optional.MysqlConnectionPoolDataSource</span>
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<span class="c"> --></span>
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<span class="nt"><property</span> <span class="na">name=</span><span class="s">"javax.persistence.jdbc.driver"</span> <span class="na">value=</span><span class="s">"com.mysql.jdbc.Driver"</span><span class="nt">/></span>
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<span class="nt"><property</span> <span class="na">name=</span><span class="s">"javax.persistence.jdbc.user"</span> <span class="na">value=</span><span class="s">"root"</span><span class="nt">/></span>
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<span class="nt"><property</span> <span class="na">name=</span><span class="s">"javax.persistence.jdbc.password"</span> <span class="na">value=</span><span class="s">"123456"</span><span class="nt">/></span>
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<span class="nt"></properties></span>
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<span class="nt"></persistence-unit></span>
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<span class="c"><!-- IM消息库 --></span>
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<span class="nt"><persistence-unit</span> <span class="na">name=</span><span class="s">"demoim"</span><span class="nt">></span>
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<span class="nt"><shared-cache-mode></span>NONE<span class="nt"></shared-cache-mode></span>
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<span class="nt"><properties></span>
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<span class="c"><!-- jdbc:mysql://127.0.0.1:3306/dbim?autoReconnect=true&amp;autoReconnectForPools=true&amp;characterEncoding=utf8 --></span>
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<span class="nt"><property</span> <span class="na">name=</span><span class="s">"javax.persistence.jdbc.url"</span> <span class="na">value=</span><span class="s">"jdbc:mysql://127.0.0.1:3306/dbim?characterEncoding=utf8"</span><span class="nt">/></span>
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<span class="nt"><property</span> <span class="na">name=</span><span class="s">"javax.persistence.jdbc.driver"</span> <span class="na">value=</span><span class="s">"com.mysql.jdbc.Driver"</span><span class="nt">/></span>
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<span class="nt"><property</span> <span class="na">name=</span><span class="s">"javax.persistence.jdbc.user"</span> <span class="na">value=</span><span class="s">"root"</span><span class="nt">/></span>
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<span class="nt"><property</span> <span class="na">name=</span><span class="s">"javax.persistence.jdbc.password"</span> <span class="na">value=</span><span class="s">"123456"</span><span class="nt">/></span>
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<span class="nt"></properties></span>
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<span class="nt"></persistence-unit></span>
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<span class="nt"></persistence></span></pre></div>
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<footer class="site-footer">
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<span class="site-footer-owner"><a href="https://github.com/wentch/redkale">RedKale</a> © <a href="https://github.com/wentch">wentch</a> 欢迎加入RedKale技术交流QQ群: 527523235</span>
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</footer>
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</section>
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</body>
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</html>
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