Spring 事务隔离级别详解 - 避免并发问题

Spring\u7684\u9694\u79bb\u7ea7\u522b\u6307\u7684\u662f\u5728\u5e76\u540c\u8bbf\u95ee\u65f6\uff0c\u6570\u636e\u5e93\u7684\u4e8b\u52a1\u4e4b\u95f4\u7684\u9694\u79bb\u7a0b\u5ea6\u3002Spring\u6846\u67b6\u652f\u6301\u4ee5\u4e0b\u4e94\u79cd\u9694\u79bb\u7ea7\u522b\uff1a\n\n1\uff0eDEFAULT\uff08\u9ed8\u8ba4\uff09\uff1a\u4f7f\u7528\u6570\u636e\u5e93\u9ed8\u8ba4\u7684\u9694\u79bb\u7ea7\u522b\u3002\n\n2\uff0eREAD_UNCOMMITTED\uff08\u8bfb\u672a\u63d0\u4ea4\uff09\uff1a\u5141\u8bb8\u8bfb\u53d6\u672a\u63d0\u4ea4\u7684\u6570\u636e\u53d8\u66f4\uff0c\u53ef\u80fd\u5bfc\u81f4\u88ab\u8bfb\u5230\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb\u53ca\u50cf\u8bfb\u7684\u95ee\u9898\u3002\n\n3\uff0eREAD_COMMITTED\uff08\u8bfb\u5df2\u63d0\u4ea4\uff09\uff1a\u53ea\u80fd\u8bfb\u53d6\u5df2\u63d0\u4ea4\u7684\u6570\u636e\uff0c\u53ef\u4ee5\u907f\u514d\u88ab\u8bfb\u5230\u7684\u95ee\u9898\uff0c\u4f46\u4ecd\u7136\u53ef\u80fd\u51fa\u73b0\u4e0d\u53ef\u91cd\u590d\u8bfb\u53ca\u50cf\u8bfb\u7684\u95ee\u9898\u3002\n\n4\uff0eREPEATABLE_READ\uff08\u53ef\u91cd\u590d\u8bfb\uff09\uff1a\u4fdd\u8bc1\u540c\u4e00\u4e8b\u52a1\u5185\u591a\u6b21\u8bfb\u53d6\u7684\u6570\u636e\u662f\u4e00\u81f4\u7684\uff0c\u53ef\u4ee5\u907f\u514d\u88ab\u8bfb\u5230\u53ca\u4e0d\u53ef\u91cd\u590d\u8bfb\u7684\u95ee\u9898\uff0c\u4f46\u4ecd\u7136\u53ef\u80fd\u51fa\u73b0\u50cf\u8bfb\u7684\u95ee\u9898\u3002\n\n5\uff0eSERIALIZABLE\uff08\u5e76\u5217\u5316\uff09\uff1a\u6700\u9ad8\u7684\u9694\u79bb\u7ea7\u522b\uff0c\u5728\u8bfb\u53d6\u53ca\u5199\u5165\u6570\u636e\u65f6\u90fd\u4f1a\u5bf9\u6570\u636e\u52a0\u9501\uff0c\u53ef\u4ee5\u907f\u514d\u88ab\u8bfb\u5230\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb\u53ca\u50cf\u8bfb\u7684\u95ee\u9898\uff0c\u4f46\u4f1a\u5f71\u54cd\u7cfb\u7edf\u6027\u80fd\u3002\n\n\u53ef\u4ee5\u901a\u8fc7\u5728@Transactional\u6ce8\u91ca\u4e2d\u6307\u5b9aisolation\u5c5e\u6027\u6765\u8bbe\u7f6e\u4e8b\u52a1\u7684\u9694\u79bb\u7ea7\u522b\u3002\u4f8b\u5982\uff1a\n\n@Transactional(isolation = Isolation.READ_COMMITTED)\npublic void doSomething() {\n // \u4e8b\u52a1\u5904\u7406\u903c\u8f91\n