{"id":10007031,"date":"2022-12-30T14:53:10","date_gmt":"2022-12-30T06:53:10","guid":{"rendered":"https:\/\/ityet.com\/?p=10007031"},"modified":"2022-12-30T14:53:10","modified_gmt":"2022-12-30T06:53:10","slug":"mybatis%e7%bc%93%e5%ad%98%e6%9c%ba%e5%88%b6","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10007031","title":{"rendered":"Mybatis\u7f13\u5b58\u673a\u5236"},"content":{"rendered":"

Mybatis\u5185\u7f6e\u4e86\u5f3a\u5927\u7684\u4e8b\u52a1\u6027\u67e5\u8be2\u7f13\u5b58\u673a\u5236\uff0c\u6b63\u786e\u4f7f\u7528Mybatis\u7684\u7f13\u5b58\u673a\u5236\u53ef\u4ee5\u6709\u6548\u63d0\u9ad8\u5e94\u7528\u7684\u6027\u80fd\u3002\u56e0\u4e3a\u4e00\u822c\u60c5\u51b5\u4e0b\u6211\u4eec\u5e94\u7528\u7684\u5927\u90e8\u5206\u6027\u80fd\u6d88\u8017\u90fd\u548c\u6570\u636e\u5e93\u67e5\u8be2\u6709\u5173\uff0c\u5982\u679c\u80fd\u591f\u6709\u6548\u547d\u4e2d\u7f13\u5b58\u3001\u9002\u5f53\u907f\u514d\u6216\u51cf\u5c11\u4e0e\u6570\u636e\u5e93\u7684\u4ea4\u4e92\uff0c\u4e00\u5b9a\u662f\u6539\u5584\u5e94\u7528\u6027\u80fd\u7684\u4e0d\u4e8c\u9009\u62e9\u3002<\/p>\n

\u4f46\u662f\u7f13\u5b58\u673a\u5236\u662f\u4e00\u628a\u53cc\u5203\u5251\uff0c\u4e0d\u6070\u5f53\u7684\u4f7f\u7528\u7f13\u5b58\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6570\u636e\u4e0d\u4e00\u81f4\u7684\u95ee\u9898\u3002<\/em><\/strong><\/p>\n

\u51b3\u4e0d\u80fd\u4e3a\u4e86\u89e3\u51b3\u6027\u80fd\u95ee\u9898\u800c\u5f15\u5165\u6570\u636e\u4e0d\u4e00\u81f4\u95ee\u9898\uff0c\u8fd9\u662f\u6bcf\u4e2a\u5f00\u53d1\u4eba\u5458\u90fd\u5e94\u8be5\u5177\u5907\u7684\u4e00\u4e2a\u57fa\u672c\u8ba4\u8bc6\u3002<\/em><\/strong><\/p>\n

\u6240\u4ee5\uff0c\u4e3a\u4e86\u65e2\u80fd\u591f\u4f18\u96c5\u7684\u89e3\u51b3\u6027\u80fd\u95ee\u9898\uff0c\u53c8\u80fd\u591f\u5b89\u5168\u7684\u89c4\u907f\u6570\u636e\u4e0d\u4e00\u81f4\u95ee\u9898\u3002\u6211\u4eec\u6709\u5fc5\u8981\u5bf9Mybatis\u7684\u7f13\u5b58\u673a\u5236\u505a\u4e00\u4e2a\u900f\u5f7b\u7684\u4e86\u89e3\u3002<\/em><\/strong><\/p>\n

\u8ba4\u8bc6Mybatis\u7f13\u5b58\u673a\u5236<\/h4>\n

Mybatis\u63d0\u4f9b\u4e86\u4e24\u79cd\u4e0d\u540c\u7684\u7f13\u5b58\u673a\u5236\uff0c\u4e5f\u5c31\u662f\u6211\u4eec\u7ecf\u5e38\u8bf4\u7684\u4e00\u7ea7\u7f13\u5b58\u3001\u4e8c\u7ea7\u7f13\u5b58\u3002<\/p>\n

\u4e00\u7ea7\u7f13\u5b58\uff1a<\/em><\/strong>\u4e5f\u53ebLocalCache\uff0c\u662f\u57fa\u4e8eSqlSession\u7684\u7f13\u5b58\uff0c\u4e5f\u5c31\u662f\u8bf4\u7f13\u5b58\u662f\u5b58\u50a8\u5728SqlSession\u8fd9\u4e2a\u7ea7\u522b\u7684\uff0c\u4f1a\u968f\u7740SqlSession\u7684\u5173\u95ed\u800c\u6d88\u5931\u3002<\/p>\n

\u4e8c\u7ea7\u7f13\u5b58\uff1a<\/em><\/strong>\u662f\u8de8SqlSession\u751f\u547d\u5468\u671f\u7684\uff0c\u4e8c\u7ea7\u7f13\u5b58\u7684\u4f5c\u7528\u57df\u662f\u5b9a\u4e49\u5728namespace\u7ea7\u522b\u7684\uff0c\u5bf9\u5e94\u7740mapper.xml\u6587\u4ef6\u7684\u5b9a\u4e49\u3002\u8de8\u4f5c\u7528\u57df\u751f\u6548\u9700\u8981\u8fdb\u884c\u4e13\u95e8\u7684\u5b9a\u4e49\u3002<\/p>\n

\u5176\u5b9e\u7a0b\u5e8f\u5458\u5e94\u8be5\u8ba4\u771f\u5bf9\u5f85\u7684\u662fMybatis\u7684\u4e8c\u7ea7\u7f13\u5b58\u673a\u5236\uff0c\u56e0\u4e3a\u4e00\u7ea7\u7f13\u5b58\u673a\u5236\u662f\u9ed8\u8ba4\u5f00\u542f\u7684\u3001\u51e0\u4e4e\u4e5f\u4e0d\u5b58\u5728\u6570\u636e\u4e0d\u4e00\u81f4\u7684\u95ee\u9898\uff0c\u4e8c\u7ea7\u7f13\u5b58\u673a\u5236\u662f\u9700\u8981\u901a\u8fc7\u914d\u7f6e\u5f00\u542f\u3001\u800c\u4e14\u7528\u4e0d\u597d\u5f88\u5bb9\u6613\u5bfc\u81f4\u6570\u636e\u4e0d\u4e00\u81f4\u7684\u95ee\u9898\u3002<\/p>\n

\u800c\u4e14\uff0c\u4e00\u7ea7\u7f13\u5b58\u4f7f\u7528\u8d77\u6765\u5e94\u8be5\u975e\u5e38\u7b80\u5355\uff0c\u6240\u4ee5Mybatis\u5b98\u7f51\u5bf9\u4e8e\u4e00\u7ea7\u7f13\u5b58\u7684\u4ecb\u7ecd\u51e0\u4e4e\u6ca1\u6709\uff0c\u800c\u5b98\u7f51\u6709\u5173\u7f13\u5b58\u7684\u8bf4\u660e\u6587\u5b57\u51e0\u4e4e\u901a\u7bc7\u90fd\u662f\u4ecb\u7ecd\u4e8c\u7ea7\u7f13\u5b58\u7684\uff08\u53c2\u8003https:\/\/mybatis.org\/mybatis-3…<\/a>\uff09\u3002<\/p>\n

\u5efa\u8bae\u5927\u5bb6\u5bf9\u5b98\u7f51\u6587\u6863\u505a\u8ba4\u771f\u5b66\u4e60\u7814\u7a76\uff0c\u5bf9\u4e8e\u5b98\u7f51\u5df2\u7ecf\u4ea4\u4ee3\u8fc7\u7684\u5185\u5bb9\uff0c\u6211\u4eec\u5c31\u4e0d\u518d\u5570\u55e6\u4e86\uff0c\u672c\u7bc7\u6587\u7ae0\u4e3b\u8981\u8865\u5145\u4e00\u4e9b\u5b98\u7f51\u6587\u7ae0\u6ca1\u6709\u63d0\u53ca\u7684\u6709\u5173Mybatis\u7f13\u5b58\u673a\u5236\u7684\u6280\u672f\u7ec6\u8282\u3002<\/p>\n

\u4e00\u7ea7\u7f13\u5b58<\/h4>\n

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\u5982\u679c\u4f60\u4e0d\u60f3\u5f00\u542fMybatis\u7684\u4e00\u7ea7\u7f13\u5b58\uff0c\u53ef\u4ee5\u901a\u8fc7Settings\u914d\u7f6e\u505a\u5168\u5c40\u5173\u95ed\uff08localCacheScope=STATEMENT\uff09\u3002<\/p>\n

\u5982\u679c\u4f60\u53ea\u662f\u9488\u5bf9\u67d0\u4e00\u53e5sql\u4e0d\u60f3\u5f00\u542f\u4e00\u7ea7\u7f13\u5b58\uff0c\u5219\u53ef\u4ee5\u5728mapping\u7684xml\u6587\u4ef6\u4e2d\u9488\u5bf9\u8be5sql\u8bed\u53e5\u914d\u7f6eflushCache\u4e3atrue\uff0c\u6ce8\u610fflushCache\u5bf9\u4e00\u7ea7\u7f13\u5b58\u548c\u4e8c\u7ea7\u7f13\u5b58\u90fd\u751f\u6548\u3002<\/p>\n

\u5efa\u8bae\u8fd8\u662f\u91c7\u7528Mybatis\u7684\u9ed8\u8ba4\u914d\u7f6e\uff0c\u5f00\u542f\u4e00\u7ea7\u7f13\u5b58\uff0c\u5c24\u5176\u662f\u5bf9\u4e8e\u90a3\u4e9b\u6709\u521d\u7ea7\u7a0b\u5e8f\u5458\u53c2\u4e0e\u7684\u9879\u76ee\uff0c\u4ed6\u4eec\u5bf9\u6027\u80fd\u7684\u95ee\u9898\u8003\u8651\u7684\u53ef\u80fd\u4f1a\u5c11\u4e00\u70b9\uff0c\u5728\u4e00\u4e2a\u4ea4\u6613\u4e2d\u5bf9\u540c\u4e00\u6761\u6570\u636e\u53ef\u80fd\u4f1a\u591a\u6b21\u67e5\u8be2\uff0c\u8fd9\u4e2a\u65f6\u5019\u6211\u4eec\u5f53\u7136\u53ef\u4ee5\u901a\u8fc7\u6846\u67b6\u8bbe\u8ba1\u3001\u57f9\u8bad\u3001code review\u7b49\u65b9\u6cd5\u5c3d\u53ef\u80fd\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\uff0c\u4f46\u662f\u5982\u679c\u65e0\u6cd5\u907f\u514d\u7684\u8bdd\uff0c\u8d77\u7801Mybatis\u7684\u4e00\u7ea7\u7f13\u5b58\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u907f\u514d\u65e0\u8c13\u7684\u6570\u636e\u5e93\u8bf7\u6c42\u3002<\/em><\/strong><\/p>\n

\u4e8c\u7ea7\u7f13\u5b58#\u5f00\u542f<\/h4>\n

\u5b98\u7f51\u8bf4\u7684\u975e\u5e38\u660e\u767d\uff0c\u4e8c\u7ea7\u7f13\u5b58\u9700\u8981\u5728mapping\u914d\u7f6e\u6587\u4ef6\u4e2d\u624b\u52a8\u5f00\u542f\uff0c\u5426\u5219Mybatis\u4e0d\u4f1a\u81ea\u52a8\u5f00\u542f\u4e8c\u7ea7\u7f13\u5b58\u3002<\/p>\n

\u6458\u6284\u5b98\u7f51\u7684\u4e00\u6bb5\u8bdd\uff1a<\/p>\n

\n

MyBatis \u5185\u7f6e\u4e86\u4e00\u4e2a\u5f3a\u5927\u7684\u4e8b\u52a1\u6027\u67e5\u8be2\u7f13\u5b58\u673a\u5236\uff0c\u5b83\u53ef\u4ee5\u975e\u5e38\u65b9\u4fbf\u5730\u914d\u7f6e\u548c\u5b9a\u5236\u3002 \u4e3a\u4e86\u4f7f\u5b83\u66f4\u52a0\u5f3a\u5927\u800c\u4e14\u6613\u4e8e\u914d\u7f6e\uff0c\u6211\u4eec\u5bf9 MyBatis 3 \u4e2d\u7684\u7f13\u5b58\u5b9e\u73b0\u8fdb\u884c\u4e86\u8bb8\u591a\u6539\u8fdb\u3002<\/p>\n

\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u53ea\u542f\u7528\u4e86\u672c\u5730\u7684\u4f1a\u8bdd\u7f13\u5b58\uff0c\u5b83\u4ec5\u4ec5\u5bf9\u4e00\u4e2a\u4f1a\u8bdd\u4e2d\u7684\u6570\u636e\u8fdb\u884c\u7f13\u5b58\u3002 \u8981\u542f\u7528\u5168\u5c40\u7684\u4e8c\u7ea7\u7f13\u5b58\uff0c\u53ea\u9700\u8981\u5728\u4f60\u7684 SQL \u6620\u5c04\u6587\u4ef6\u4e2d\u6dfb\u52a0\u4e00\u884c\uff1a
<cache\/>
\u57fa\u672c\u4e0a\u5c31\u662f\u8fd9\u6837\u3002\u8fd9\u4e2a\u7b80\u5355\u8bed\u53e5\u7684\u6548\u679c\u5982\u4e0b:<\/p>\n

    \n
  1. \u6620\u5c04\u8bed\u53e5\u6587\u4ef6\u4e2d\u7684\u6240\u6709 select \u8bed\u53e5\u7684\u7ed3\u679c\u5c06\u4f1a\u88ab\u7f13\u5b58\u3002<\/li>\n
  2. \u6620\u5c04\u8bed\u53e5\u6587\u4ef6\u4e2d\u7684\u6240\u6709 insert\u3001update \u548c delete \u8bed\u53e5\u4f1a\u5237\u65b0\u7f13\u5b58\u3002<\/li>\n
  3. \u7f13\u5b58\u4f1a\u4f7f\u7528\u6700\u8fd1\u6700\u5c11\u4f7f\u7528\u7b97\u6cd5\uff08LRU, Least Recently Used\uff09\u7b97\u6cd5\u6765\u6e05\u9664\u4e0d\u9700\u8981\u7684\u7f13\u5b58\u3002<\/li>\n
  4. \u7f13\u5b58\u4e0d\u4f1a\u5b9a\u65f6\u8fdb\u884c\u5237\u65b0\uff08\u4e5f\u5c31\u662f\u8bf4\uff0c\u6ca1\u6709\u5237\u65b0\u95f4\u9694\uff09\u3002<\/li>\n
  5. \u7f13\u5b58\u4f1a\u4fdd\u5b58\u5217\u8868\u6216\u5bf9\u8c61\uff08\u65e0\u8bba\u67e5\u8be2\u65b9\u6cd5\u8fd4\u56de\u54ea\u79cd\uff09\u7684 1024 \u4e2a\u5f15\u7528\u3002<\/li>\n
  6. \u7f13\u5b58\u4f1a\u88ab\u89c6\u4e3a\u8bfb\/\u5199\u7f13\u5b58\uff0c\u8fd9\u610f\u5473\u7740\u83b7\u53d6\u5230\u7684\u5bf9\u8c61\u5e76\u4e0d\u662f\u5171\u4eab\u7684\uff0c\u53ef\u4ee5\u5b89\u5168\u5730\u88ab\u8c03\u7528\u8005\u4fee\u6539\uff0c\u800c\u4e0d\u5e72\u6270\u5176\u4ed6\u8c03\u7528\u8005\u6216\u7ebf\u7a0b\u6240\u505a\u7684\u6f5c\u5728\u4fee\u6539\u3002<\/li>\n<\/ol>\n<\/blockquote>\n

    \u4e0d\u5f00\u542f\u4e8c\u7ea7\u7f13\u5b58\u7684\u60c5\u51b5\u4e0b\uff0cMybatis\u5e95\u5c42\u7528BaseExecutor\u5bf9\u8c61\u6267\u884csql\uff0c\u5f00\u542f\u540e\u4f7f\u7528CachingExecutor\u6267\u884csql\uff0cCachingExecutor\u5728\u521b\u5efa\u7684\u65f6\u5019\u4f1a\u6301\u6709Mapper\u521d\u59cb\u5316\u8fc7\u7a0b\u4e2d\u4ee5\u88c5\u9970\u5668\u6a21\u5f0f\u521b\u5efa\u597d\u7684\u5c42\u5c42\u5305\u88c5\u7684SynchronizedCache\u5bf9\u8c61\uff0csql\u8bed\u53e5\u7684\u6267\u884c\u7ed3\u679c\u6700\u7ec8\u7531\u8fd9\u4e2a\u5305\u88c5\u5668\u6301\u6709\u4ece\u800c\u5b9e\u73b0\u7f13\u5b58\u3002<\/p>\n

    \u4e8c\u7ea7\u7f13\u5b58#\u4f5c\u7528\u8303\u56f4<\/h4>\n

    \u6211\u4eec\u524d\u9762\u5df2\u7ecf\u8bf4\u8fc7\u4e86\u4e8c\u7ea7\u7f13\u5b58\u7684\u4f5c\u7528\u8303\u56f4\u662fnamespace\uff0cMybatis\u5b98\u7f51\u4e5f\u6709\u4e00\u4e2a\u4e0e\u53e5\u8bdd\u7684\u63d0\u793a\uff1a<\/p>\n

    \u63d0\u793a \u7f13\u5b58\u53ea\u4f5c\u7528\u4e8e cache \u6807\u7b7e\u6240\u5728\u7684\u6620\u5c04\u6587\u4ef6\u4e2d\u7684\u8bed\u53e5\u3002\u5982\u679c\u4f60\u6df7\u5408\u4f7f\u7528 Java API \u548c XML \u6620\u5c04\u6587\u4ef6\uff0c\u5728\u5171\u7528\u63a5\u53e3\u4e2d\u7684\u8bed\u53e5\u5c06\u4e0d\u4f1a\u88ab\u9ed8\u8ba4\u7f13\u5b58\u3002\u4f60\u9700\u8981\u4f7f\u7528 @CacheNamespaceRef \u6ce8\u89e3\u6307\u5b9a\u7f13\u5b58\u4f5c\u7528\u57df\u3002<\/p><\/blockquote>\n

    \u6211\u4eec\u4e00\u5b9a\u8981\u5bf9\u8fd9\u53e5\u8bdd\u6709\u8db3\u591f\u7684\u91cd\u89c6\uff0c\u56e0\u4e3a\u8fd9\u4e2a\u5730\u65b9\u5982\u679c\u4f7f\u7528\u4e0d\u5f53\u7684\u8bdd\uff0c\u4e5f\u662f\u5bb9\u6613\u5f15\u8d77\u7f13\u5b58\u4e00\u81f4\u6027\u95ee\u9898\u7684\u3002<\/em><\/strong><\/p>\n

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