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mybatis.drawio
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<mxCell id="8foiymuQkOx7uc3-mmT_-90" value="configurationElement(<br>parser.evalNode("/mapper"))<br><font style="font-size: 10px" color="#3399ff">解析并加载“/mapper”根节点，然后记录到loadedResouces</font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;arcSize=11;fillColor=#dae8fc;strokeColor=#6c8ebf;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="8foiymuQkOx7uc3-mmT_-92" value="bindMapperForNamespace()<br><font color="#3399ff">将当前namespace指定的Mapper Interface 类型及Mapper代理工厂注册到Configurations$<b>mapperRegistry</b>中</font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;arcSize=11;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="8foiymuQkOx7uc3-mmT_-97" value=""namespace" <font color="#3399ff">命名空间 -&gt;&nbsp;cacheRefMap</font><br>"cache-ref" <font color="#3399ff">缓存配置引用</font><br>"cache" <font color="#3399ff">缓存配置</font><br><strike>"/mapper/parameterMap" <font color="#3399ff">参数映射</font><br></strike>"/mapper/resultMap"<br>"/mapper/sql"<span>	</span><font color="#3399ff">可重用sql模块</font><br>"select|insert|update|delete"" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;arcSize=7;align=left;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="8foiymuQkOx7uc3-mmT_-99" value="缓存配置：<font color="#3399ff">Mybatis提供了多种实现</font><br>Cache cache = new CacheBuilder(...)<br>configuration.addCache(cache);" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;arcSize=7;align=left;fillColor=#dae8fc;strokeColor=#6c8ebf;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="nTEty8VkxfBIhpbtXYr3-1" value="resultMap<br>1) 获取type属性，获取对应Class类型，并注册到typeAliasRegistry<br>2) 解析各个字段的映射规则（包括列名、java类型、jdbc类型、自定义类型转换器、flags等等）<br>3）最后将映射规则注册到XMLMapperBuilder$<b>builderAssistant</b><br>同时还创建了ResultMapResolver注册到<b>&nbsp;</b>Configuration$<b>incompleteResultMaps</b>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;arcSize=7;align=left;fillColor=#dae8fc;strokeColor=#6c8ebf;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="nTEty8VkxfBIhpbtXYr3-2" value="可重用sql&nbsp;<br>涉及databaseId、id属性，最终将可重用sql片段存储到 XMLMapperBuilder$<b>sqlFragments</b>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;arcSize=7;align=left;fillColor=#dae8fc;strokeColor=#6c8ebf;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="nTEty8VkxfBIhpbtXYr3-4" value="<font color="#3399ff"><span style="font-size: 10px">resultMap解析还是比较复杂的，可以实现复杂查询语句的结果映射<br>这个后面详细分析 TODO<br></span></font>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="nTEty8VkxfBIhpbtXYr3-12" value="<font color="#3399ff"><span style="font-size: 10px">XMLStatementBuilder是后面获取Mapper代理对象时很重要的一个对象<br>后面详细分析 TODO<br></span></font>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="nTEty8VkxfBIhpbtXYr3-16" value="parser = new MapperAnnotationBuilder(config, type);<br>parser.parse()<br>注解形式定义的Statement的解析及构造器&nbsp;<b>MethodResolver</b><br>注册到&nbsp;<span>Configuration$</span><b>incompleteMethods</b>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;arcSize=11;align=left;fillColor=#dae8fc;strokeColor=#6c8ebf;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="nTEty8VkxfBIhpbtXYr3-18" value="<font color="#3399ff"><span style="font-size: 10px"><b>XMLStatementBuilder</b>是处理XML statement定义的</span><br><span style="font-size: 10px"><b>MethodResolver</b> 是处理 注解 statement定义的</span><br></font>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="nTEty8VkxfBIhpbtXYr3-27" value="" style="edgeStyle=orthogonalEdgeStyle;curved=1;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;fontSize=10;fontColor=#3399FF;strokeColor=#330000;elbow=vertical;" parent="WIyWlLk6GJQsqaUBKTNV-1" source="nTEty8VkxfBIhpbtXYr3-22" target="nTEty8VkxfBIhpbtXYr3-26" edge="1">
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<mxCell id="nTEty8VkxfBIhpbtXYr3-22" value="parsePendingResultMaps()<br><font color="#3399ff">遍历incompleteResultMaps执行resolve整合到 ResultMapResolver.assistant</font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;arcSize=11;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="nTEty8VkxfBIhpbtXYr3-29" value="" style="edgeStyle=orthogonalEdgeStyle;curved=1;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;fontSize=10;fontColor=#3399FF;strokeColor=#330000;elbow=vertical;" parent="WIyWlLk6GJQsqaUBKTNV-1" source="nTEty8VkxfBIhpbtXYr3-26" target="nTEty8VkxfBIhpbtXYr3-28" edge="1">
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<mxCell id="nTEty8VkxfBIhpbtXYr3-26" value="parsePendingCacheRefs()<br><font color="#3399ff">同上，后续处理</font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;arcSize=11;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="nTEty8VkxfBIhpbtXYr3-28" value="parsePendingStatements()<br><span style="color: rgb(51 , 153 , 255)">同上，后续处理</span>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;arcSize=11;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="nTEty8VkxfBIhpbtXYr3-30" value="前面为何不处理完全？<br>可能在等待什么依赖的配置解析完才能继续<br>这个后面再看" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;fontSize=10;fontColor=#3399FF;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="nTEty8VkxfBIhpbtXYr3-34" value="通过这一步主要创建了XMLStatementBuilder，和几个Resolver类" style="text;html=1;strokeColor=none;fillColor=none;align=left;verticalAlign=middle;whiteSpace=wrap;rounded=0;fontSize=10;fontColor=#3399FF;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="nTEty8VkxfBIhpbtXYr3-35" value="<span style="font-size: 10px"><font color="#ff0080">疑问：XMLMapperBuilder只是中间对象，解析阶段完成后sqlFragments应该还是要存到<br>Configuration$sqlFragments 才对，哪一步传过去的？ TODO</font><br></span>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="sPj-nGploxGMAyuYcm76-1" value="environmentsElement(<br>root.evalNode("environments"))<br><font color="#3399ff" style="font-size: 8px">创建事务工厂实例，这里是JDBCTransactionFactory; 创建数据源这里是PooledDataSource; 然后构造Envorionment实例存入Configuration</font>" style="whiteSpace=wrap;html=1;fontSize=10;rounded=1;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="sPj-nGploxGMAyuYcm76-6" value="<font>executor = new SimpleExecutor(this, transaction);<br><font color="#3399ff">有三种执行器类型（测试中选用的SIMPLE）</font><br></font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;strokeColor=#000000;fontColor=#000000;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="sPj-nGploxGMAyuYcm76-8" value="<font>executor = new CachingExecutor(executor);<br><font color="#3399ff">是否为执行器开启缓存（这个是<b>一级缓存</b>默认开启）<br>关键是TransactionalCacheManager</font><br></font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;strokeColor=#82b366;fillColor=#d5e8d4;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="sPj-nGploxGMAyuYcm76-10" value="<font>executor = (Executor) interceptorChain.pluginAll(executor);<br><font color="#3399ff">通过动态代理</font><span style="color: rgb(51 , 153 , 255)">将插件逻辑</span><font color="#3399ff">一层层地包装到Executor上，如果有加载插件的话<br>最终拿到的Executor是个代理类</font><br></font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;strokeColor=#82b366;fillColor=#d5e8d4;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="sPj-nGploxGMAyuYcm76-20" value="<font style="font-size: 10px">MapperProxy&lt;T&gt; mapperProxy = new <b>MapperProxy</b>&lt;&gt;(sqlSession, mapperInterface, methodCache);<br><font color="#007fff">MapperProxy实现InvocationHandler接口，即定义了增强逻辑</font><br></font>" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#fff2cc;strokeColor=#d6b656;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="sPj-nGploxGMAyuYcm76-24" value="<font color="#000000"><span style="font-size: 10px">MapperProxy 数据结构</span></font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=8;fontColor=#3399FF;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="sPj-nGploxGMAyuYcm76-25" value="<div>private static final Constructor&lt;Lookup&gt; lookupConstructor; <font color="#3399ff">//获取的MethodHandles.Lookup.class的构造器方法</font></div><div>private static final Method privateLookupInMethod; <font color="#3399ff">//估计是用于旧版本兼容</font></div><div>private final SqlSession sqlSession;</div><div>private final Class&lt;T&gt; mapperInterface;</div><div>private final Map&lt;Method, MapperMethodInvoker&gt; methodCache; <font color="#3399ff">//MapperMethodInvoker（核心是MapperMethod）缓存</font></div>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;fontColor=#000000;arcSize=2;align=left;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="sPj-nGploxGMAyuYcm76-26" value="&nbsp;newInstance(mapperProxy)" style="rounded=1;whiteSpace=wrap;html=1;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="sPj-nGploxGMAyuYcm76-28" value="lookup = MethodHandles.Lookup.class.<br style="font-size: 10px">getDeclaredConstructor(Class.class, int.class);<br style="font-size: 10px">lookupConstructor = lookup;<br><font color="#3399ff">Mapper接口没定义default方法的话不会用到 MethodHandle</font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="sPj-nGploxGMAyuYcm76-30" value="<font style="font-size: 10px">Proxy.newProxyInstance(<br>mapperInterface.getClassLoader(), <br>new Class[] { <b>mapperInterface</b> }, <b>mapperProxy</b>)<br><font color="#3399ff">invoke()内部使用MethodHandle</font><br></font>" style="rounded=1;whiteSpace=wrap;html=1;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="sPj-nGploxGMAyuYcm76-32" value="MapperProxy中最重要的代码是 invoke() -&gt;&nbsp;cachedInvoker()&nbsp; 中<br>return new PlainMethodInvoker(<br>new <b>MapperMethod</b>(mapperInterface, method, sqlSession.getConfiguration()))" style="text;html=1;strokeColor=none;fillColor=none;align=left;verticalAlign=middle;whiteSpace=wrap;rounded=0;fontSize=10;fontColor=#3399FF;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="sPj-nGploxGMAyuYcm76-33" value="<font style="font-size: 10px">MapperProxy$invoke()</font>" style="rounded=1;whiteSpace=wrap;html=1;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="sPj-nGploxGMAyuYcm76-35" value="<font><span style="font-size: 10px">MapperMethodInvoker invoker = cachedInvoker(method)</span><br><font color="#3399ff" style="font-size: 8px">获取缓存的MapperMethod,没有则新建,并缓存到 MapperPrxoy的</font><font color="#3399ff"><span style="font-size: 8px">methodCache</span></font><br></font>" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#f8cecc;strokeColor=#b85450;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="sPj-nGploxGMAyuYcm76-37" value="<font><span style="font-size: 10px">invoker.<b>invoke</b>(proxy, method, args, sqlSession)</span><br><font color="#3399ff" style="font-size: 8px">调用MapperMethod的execute()方法，执行SQL语句并返回结果</font><br></font>" style="rounded=1;whiteSpace=wrap;html=1;fillColor=#f8cecc;strokeColor=#b85450;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="sPj-nGploxGMAyuYcm76-39" value="<font style="font-size: 10px">new <b>SqlCommand</b>(config, mapperInterface, method)<br><font color="#3399ff">包括SQL类型、SQL statement名</font><br></font>" style="rounded=1;whiteSpace=wrap;html=1;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="sPj-nGploxGMAyuYcm76-61" value="<font face="jetbrains mono, monospace"><span style="font-size: 11.2px">FLUSH</span></font>" style="whiteSpace=wrap;html=1;fontSize=10;strokeColor=#000000;fontColor=#000000;rounded=1;arcSize=8;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="sPj-nGploxGMAyuYcm76-72" value="查找单个结果<br>返回普通类型或Optional.class类型" style="whiteSpace=wrap;html=1;fontSize=10;strokeColor=#000000;fontColor=#000000;rounded=1;arcSize=8;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="sPj-nGploxGMAyuYcm76-87" value="<div>private final boolean returnsMany; <font color="#3399ff">//是否返回多个结果</font></div><div>private final boolean returnsMap;</div><div>private final boolean returnsVoid;</div><div>private final boolean returnsCursor;</div><div>private final boolean returnsOptional;</div><div>private final Class&lt;?&gt; returnType;</div><div>private final String mapKey;</div><div>private final Integer resultHandlerIndex;</div><div>private final Integer rowBoundsIndex;</div><div>private final ParamNameResolver paramNameResolver;</div>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;fontColor=#000000;arcSize=2;align=left;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="sPj-nGploxGMAyuYcm76-96" value="<font>this.returnsVoid = void.class.equals(this.returnType); <font color="#3399ff">无返回值</font><br style="font-size: 10px"></font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="sPj-nGploxGMAyuYcm76-97" value="<font style="font-size: 9px">this.returnsMany = configuration.getObjectFactory()<br style="font-size: 9px">.isCollection(this.returnType) || this.returnType.isArray(); <font color="#3399ff">返回集合或数组</font><br style="font-size: 9px"></font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=9;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="sPj-nGploxGMAyuYcm76-98" value="<font>this.returnsCursor = Cursor.class.equals(this.returnType); <font color="#3399ff">返回Cursor.class</font><br style="font-size: 10px"></font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="sPj-nGploxGMAyuYcm76-99" value="<font>this.returnsOptional = Optional.class.equals(this.returnType); <font color="#3399ff">返回Optional.class</font><br style="font-size: 10px"></font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=10;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="sPj-nGploxGMAyuYcm76-100" value="<font style="font-size: 8px"><div style="font-size: 8px">this.mapKey = getMapKey(method);</div><div style="font-size: 8px">&nbsp; &nbsp; &nbsp; this.returnsMap = this.mapKey != null;&nbsp; <font color="#3399ff">@MapKey注解的值 ？？？</font></div></font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=8;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="sPj-nGploxGMAyuYcm76-101" value="<font style="font-size: 9px">this.rowBoundsIndex = getUniqueParamIndex(method, RowBounds.class); <br><font color="#3399ff" style="font-size: 9px">获取method RowBounds类型参数索引 ？？？</font><br style="font-size: 11px"></font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=11;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="sPj-nGploxGMAyuYcm76-102" value="<font style="font-size: 9px;">this.resultHandlerIndex = getUniqueParamIndex(method, ResultHandler.class);<br style="font-size: 9px;"><font color="#3399ff" style="font-size: 9px;">获取method ResultHandler类型参数索引 ？？？</font><br style="font-size: 9px;"></font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=9;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="sPj-nGploxGMAyuYcm76-103" value="<font style="font-size: 9px;">this.paramNameResolver = new ParamNameResolver(configuration, method);<br style="font-size: 9px;"><font color="#3399ff" style="font-size: 9px;">处理@Param注解的参数 ？？？</font><br style="font-size: 9px;"></font>" style="rounded=1;whiteSpace=wrap;html=1;fontSize=9;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="FaMM4MfJ-Ujy_KWEskPM-0" value="return paramNameResolver<br>.getNamedParams(args)<br><font color="#3399ff" style="font-size: 9px">获取命名的参数？如果参数有多个返回参数Map ...</font>" style="whiteSpace=wrap;html=1;fontSize=10;strokeColor=#b85450;rounded=1;arcSize=8;fillColor=#f8cecc;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="FaMM4MfJ-Ujy_KWEskPM-13" value="MappedStatement<span style="font-weight: normal"> ms = configuration</span><br><span style="font-weight: normal">.getMappedStatement(statement)</span><br><font style="font-size: 8px" color="#3399ff"><span style="font-weight: normal">使用方法名换取之前解析XML创建的</span><span style="font-weight: 400">mappedStatements中的MappedStatement对象</span></font>" style="whiteSpace=wrap;html=1;fontSize=10;strokeColor=#d6b656;rounded=1;arcSize=8;fontStyle=1;fillColor=#fff2cc;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="FaMM4MfJ-Ujy_KWEskPM-20" value="CachingExecutor" style="text;html=1;align=center;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;fontSize=9;fontColor=#3399FF;fontStyle=1" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="FaMM4MfJ-Ujy_KWEskPM-21" value="<span style="font-weight: 400">BoundSql boundSql = ms.getBoundSql(parameterObject);<br><font color="#3399ff">基本包含SQL所有信息:sql语句、参数映射、参数值</font><br></span>" style="whiteSpace=wrap;html=1;fontSize=10;strokeColor=#d6b656;rounded=1;arcSize=8;fontStyle=1;fillColor=#fff2cc;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="FaMM4MfJ-Ujy_KWEskPM-23" value="<font><span style="font-weight: 400">CacheKey key = </span>createCacheKey<span style="font-weight: 400">(ms, parameterObject, rowBounds, boundSql)<br></span><font color="#3399ff" size="1"><span style="font-weight: 400 ; font-size: 9px">创建缓存的Key,内容和BoundSql差不多，后面查缓存时用的</span></font></font>" style="whiteSpace=wrap;html=1;fontSize=10;strokeColor=#b85450;rounded=1;arcSize=8;fontStyle=1;fillColor=#f8cecc;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="FaMM4MfJ-Ujy_KWEskPM-25" value="query<span style="font-weight: 400">(ms, parameterObject, rowBounds, resultHandler, key, boundSql)</span>" style="whiteSpace=wrap;html=1;fontSize=10;strokeColor=#000000;fontColor=#000000;rounded=1;arcSize=8;fontStyle=1" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="9RbiF7Askb06rhWkXzBX-11" style="edgeStyle=orthogonalEdgeStyle;curved=1;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.5;exitY=1;exitDx=0;exitDy=0;fontSize=9;fontColor=#007FFF;" parent="WIyWlLk6GJQsqaUBKTNV-1" source="FaMM4MfJ-Ujy_KWEskPM-27" target="9RbiF7Askb06rhWkXzBX-10" edge="1">
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<mxCell id="FaMM4MfJ-Ujy_KWEskPM-27" value="<span style="font-weight: 400">Cache cache = ms.getCache()</span><br><span style="font-weight: 400">if (cache != null) ：</span><br>List&lt;E&gt; list = (List&lt;E&gt;) tcm.getObject(cache, key);<br><font color="#3399ff"><span style="font-weight: normal">即先尝试从</span>二级缓存<span style="font-weight: normal">获取</span></font><br><span style="font-weight: 400"><font color="#3399ff" style="font-size: 8px">Configuration -&gt; mappedStatements(Map) -&gt; MappedStatement -&gt; Cache</font></span>" style="whiteSpace=wrap;html=1;fontSize=10;strokeColor=#b85450;rounded=1;arcSize=8;fontStyle=1;fillColor=#f8cecc;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="FaMM4MfJ-Ujy_KWEskPM-29" value="<span style="font-weight: normal">list = </span>delegate.query<span style="font-weight: 400">(ms, parameterObject, rowBounds, resultHandler, key, boundSql)</span>" style="whiteSpace=wrap;html=1;fontSize=10;strokeColor=#000000;fontColor=#000000;rounded=1;arcSize=8;fontStyle=1" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="FaMM4MfJ-Ujy_KWEskPM-31" value="<span style="font-weight: normal">list = </span>queryFromDatabase<span style="font-weight: normal">(ms, parameter, rowBounds, resultHandler, key, boundSql)</span>" style="whiteSpace=wrap;html=1;fontSize=10;strokeColor=#d6b656;rounded=1;arcSize=8;fontStyle=1;fillColor=#fff2cc;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="FaMM4MfJ-Ujy_KWEskPM-41" value="<span style="font-weight: 400">PreparedStatement ps = (PreparedStatement) statement;</span><br><span style="font-weight: 400">ps.execute();<br><font color="#3399ff">进入到JDBC代码执行并返回结果</font><br></span>" style="whiteSpace=wrap;html=1;fontSize=10;strokeColor=#d6b656;rounded=1;arcSize=8;fontStyle=1;fillColor=#fff2cc;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="ZMCkvMuu3y16pFemIggh-0" value="<font color="#3399ff">这之前还有一步判断：<br style="font-size: 8px">调用的方法是否是Object类声明的，<br>不过基本不可能走这一步，略<br></font>" style="text;html=1;align=left;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;fontSize=8;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="ZMCkvMuu3y16pFemIggh-3" value="m.isDefault()<br style="font-size: 10px;"><font color="#3399ff" style="font-size: 10px;">是否是 default方法</font>" style="rhombus;whiteSpace=wrap;html=1;rounded=1;fontSize=10;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="ZMCkvMuu3y16pFemIggh-19" value="<b><font style="font-size: 12px">梳理进度</font></b><br style="font-size: 9px"><br style="font-size: 9px"><b style="font-size: 9px">1） “select”主线的逻辑，包括</b><br style="font-size: 9px"><ul style="font-size: 9px"><li style="font-size: 9px"><b style="font-weight: bold ; font-size: 9px">XML解析 </b>（将xml配置解析到Configuaraion全局配置对象[不是静态类，很多对象都包含其引用]，包含很多xml指定的和默认的配置）</li><li style="font-size: 9px"><b style="font-weight: bold ; font-size: 9px">插件原理 </b>（JDK Proxy 装饰者模式，形式为通过拦截器链进行代理装饰）</li><li style="font-size: 9px"><b>Mapper动态代理</b> （SQL执行入口，内部构造Sql参数、Statement、使用executor执行、将结果集映射到Mapper接口返回类型对象）<br>关于动态代理逻辑已抽离到了测试，参考：top.kwseeker.mybatis.analysis.proxy.MethodHandleTest</li><li><b>缓存机制&nbsp;&nbsp;</b>（两级缓存 session / namespace，说三级缓存的是把redis等第三方缓存算进来了）<br>由源码可知这两级缓存在分布式场景下都存在“可能出现脏数据的”问题，需要注意。<br>可以通过设置 LocalCacheScope.STATEMENT 关闭一级缓存，或者通过设置 flushCache =“true” 关闭单个SQL语句的一级缓存。</li></ul><div>TODO:</div><ul><li style="font-size: 9px">RoutingStatementHandler执行详细流程（StatementHandler、ParameterHandler、ResultSetHandler、连接池）</li><li>缓存的LRU机制</li><li style="font-size: 9px">复杂关联查询的原理：一对多、多对多映射</li><li style="font-size: 9px">延迟加载、动态SQL</li><li style="font-size: 9px">常用插件实现原理（分页插件、乐观锁插件）</li></ul>" style="text;html=1;strokeColor=none;fillColor=none;align=left;verticalAlign=top;whiteSpace=wrap;rounded=0;fontSize=9;fontColor=#3399FF;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="ZMCkvMuu3y16pFemIggh-27" value="Y" style="edgeLabel;html=1;align=center;verticalAlign=middle;resizable=0;points=[];fontSize=10;fontColor=#3399FF;" parent="ZMCkvMuu3y16pFemIggh-26" vertex="1" connectable="0">
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<mxCell id="ZMCkvMuu3y16pFemIggh-25" value="<span style="font-weight: normal">clearLocalCache();<br><font color="#3399ff">清理一级缓存</font><br></span>" style="whiteSpace=wrap;html=1;fontSize=10;strokeColor=#000000;fontColor=#000000;rounded=1;arcSize=8;fontStyle=1;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="ZMCkvMuu3y16pFemIggh-29" value="<span style="font-weight: 400">list = resultHandler == null ? (List&lt;E&gt;) localCache.</span>getObject<span style="font-weight: 400">(key) : null<br></span><font color="#3399ff">从一级缓存（本地缓存）</font><span style="color: rgb(51 , 153 , 255) ; font-weight: 400">获取</span>" style="whiteSpace=wrap;html=1;fontSize=10;strokeColor=#b85450;rounded=1;arcSize=8;fontStyle=1;fillColor=#f8cecc;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="ZMCkvMuu3y16pFemIggh-33" value="Y,不为空" style="edgeStyle=orthogonalEdgeStyle;curved=1;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;fontSize=9;fontColor=#3399FF;entryX=0;entryY=0.5;entryDx=0;entryDy=0;" parent="WIyWlLk6GJQsqaUBKTNV-1" source="ZMCkvMuu3y16pFemIggh-31" target="ZMCkvMuu3y16pFemIggh-34" edge="1">
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<mxCell id="ZMCkvMuu3y16pFemIggh-36" value="N" style="edgeStyle=orthogonalEdgeStyle;curved=1;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.5;exitY=1;exitDx=0;exitDy=0;entryX=0.5;entryY=0;entryDx=0;entryDy=0;fontSize=9;fontColor=#3399FF;" parent="WIyWlLk6GJQsqaUBKTNV-1" source="ZMCkvMuu3y16pFemIggh-31" target="FaMM4MfJ-Ujy_KWEskPM-31" edge="1">
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<mxCell id="ZMCkvMuu3y16pFemIggh-31" value="<span style="font-weight: normal ; font-size: 9px">list != null ?<br><font color="#007fff">一级缓存<br>此key是否为空</font></span><span style="font-family: monospace ; font-weight: 400 ; font-size: 0px"><font color="#007fff">%3CmxGraphModel%3E%3Croot%3E%3CmxCell%20id%3D%220%22%2F%3E%3CmxCell%20id%3D%221%22%20parent%3D%220%22%2F%3E%3CmxCell%20id%3D%222%22%20value%3D%22%26lt%3Bspan%20style%3D%26quot%3Bfont-weight%3A%20normal%26quot%3B%26gt%3BqueryStack%20%3D%3D%200%20%26amp%3Bamp%3B%26amp%3Bamp%3B%20ms.isFlushCacheRequired()%26lt%3B%2Fspan%26gt%3B%22%20style%3D%22rhombus%3BwhiteSpace%3Dwrap%3Bhtml%3D1%3BfontSize%3D10%3BstrokeColor%3D%23000000%3BfontColor%3D%23000000%3Brounded%3D1%3BarcSize%3D8%3BfontStyle%3D1%3B%22%20vertex%3D%221%22%20parent%3D%221%22%3E%3CmxGeometry%20x%3D%222730%22%20y%3D%222185%22%20width%3D%22120%22%20height%3D%2250%22%20as%3D%22geometry%22%2F%3E%3C%2FmxCell%3E%3C%2Froot%3E%3C%2FmxGraphModel%3E</font></span><span style="font-weight: normal"><br></span>" style="rhombus;whiteSpace=wrap;html=1;fontSize=10;strokeColor=#000000;fontColor=#000000;rounded=1;arcSize=8;fontStyle=1;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="ZMCkvMuu3y16pFemIggh-34" value="<span style="font-weight: 400">handleLocallyCachedOutputParameters(<br>ms, key, parameter, boundSql)</span>" style="whiteSpace=wrap;html=1;fontSize=10;strokeColor=#000000;fontColor=#000000;rounded=1;arcSize=8;fontStyle=1" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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<mxCell id="ZMCkvMuu3y16pFemIggh-37" value="它的基类里面创建了<b>二级缓存</b>（namespace）<br>this.localCache = new <b>PerpetualCache</b>("LocalCache")<br>后面执行SQL查询会用到" style="text;html=1;strokeColor=none;fillColor=none;align=left;verticalAlign=middle;whiteSpace=wrap;rounded=0;fontSize=8;fontColor=#3399FF;" parent="WIyWlLk6GJQsqaUBKTNV-1" vertex="1">
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