{"id":1611,"date":"2020-11-24T21:02:08","date_gmt":"2020-11-24T13:02:08","guid":{"rendered":"https:\/\/www.yusian.com\/blog\/?p=1611"},"modified":"2020-11-24T21:02:08","modified_gmt":"2020-11-24T13:02:08","slug":"mysq%e4%b8%ad%e4%ba%8b%e5%8a%a1%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5","status":"publish","type":"post","link":"https:\/\/www.yusian.com\/blog\/database\/2020\/11\/24\/2102081611.html","title":{"rendered":"MySQ\u4e2d\u4e8b\u52a1\u7684\u57fa\u672c\u6982\u5ff5"},"content":{"rendered":"<pre><code class=\"language-sql line-numbers\">\/*** \u4e8b\u52a1 ***\/\n# \u5982\u679c\u4e00\u4e2a\u5305\u542b\u591a\u4e2a\u6b65\u9aa4\u7684\u4e1a\u52a1\u64cd\u4f5c\uff0c\u88ab\u4e8b\u52a1\u7ba1\u7406\uff0c\u90a3\u4e48\u8fd9\u4e9b\u64cd\u4f5c\u8981\u4e48\u540c\u65f6\u6210\u529f\uff0c\u8981\u4e48\u540c\u65f6\u5931\u8d25\u3002\n# \u9ed8\u8ba4\u60c5\u51b5\u4e0b\u5355\u6761sql\u8bed\u53e5\u90fd\u662f\u81ea\u52a8\u63d0\u4ea4\u4e8b\u52a1\n# \u64cd\u4f5c\uff1a\n#      1\u3001\u5f00\u542f\u4e8b\u52a1\uff1astart transaction\n#      2\u3001\u56de\u6eda\uff1arollback\n#      3\u3001\u63d0\u4ea4\uff1acommit\n# MySQL\u4e8b\u52a1\u9ed8\u8ba4\u7684\u63d0\u4ea4\u65b9\u5f0f\u662f\u81ea\u52a8\u63d0\u4ea4\uff0c\u5373\u6bcf\u6761SQL\u8bed\u53e5\u90fd\u662f\u4e00\u4e2a\u4e8b\u52a1\n# \u67e5\u770b\u63d0\u4ea4\u65b9\u5f0f select @@autocommit\nSELECT @@autocommit; \n\n# \u4e8b\u52a1\u56db\u5927\u7279\u5f81\n#      1\u3001\u539f\u5b50\u6027\uff1a\u4e0d\u53ef\u5206\u5272\u7684\u6700\u5c0f\u5355\u5143\uff0c\u8981\u4e48\u540c\u65f6\u6210\u529f\uff0c\u8981\u4e48\u540c\u65f6\u5931\u8d25\n#      2\u3001\u6301\u4e45\u6027\uff1a\u5f53\u4e8b\u52a1\u63d0\u4ea4\u6216\u56de\u6eda\u540e\uff0c\u6570\u636e\u5e93\u5c06\u4f1a\u6301\u4e45\u5316\u5730\u4fdd\u5b58\u6570\u636e\n#      3\u3001\u9694\u79bb\u6027\uff1a\u591a\u4e2a\u4e8b\u52a1\u4e4b\u95f4\uff0c\u76f8\u4e92\u72ec\u7acb\u3002\n#      4\u3001\u4e00\u81f4\u6027\uff1a\u4e8b\u52a1\u64cd\u4f5c\u7684\u524d\u540e\uff0c\u6570\u636e\u603b\u91cf\u4e0d\u53d8\n\n# \u4e8b\u52a1\u7684\u9694\u79bb\u7ea7\u522b\n# \u6982\u5ff5\uff1a\u591a\u4e2a\u4e8b\u52a1\u662f\u9694\u79bb\u7684\uff0c\u4f46\u591a\u4e2a\u4e8b\u52a1\u64cd\u4f5c\u7684\u662f\u540c\u4e00\u6279\u6570\u636e\uff0c\u5219\u4f1a\u51fa\u73b0\u95ee\u9898\uff0c\u8bbe\u7f6e\u4e0d\u540c\u7684\u9694\u79bb\u7ea7\u522b\u6765\u89e3\u51b3\u8fd9\u4e9b\u95ee\u9898\uff1b\n# \u95ee\u9898\uff1a\n#      1\u3001\u810f\u8bfb\uff1a\u4e00\u4e2a\u4e8b\u52a1\u8bfb\u5230\u4e86\u53e6\u4e00\u4e2a\u4e8b\u52a1\u8fd8\u672a\u63d0\u4ea4\u7684\u6570\u636e\uff1b\n#      2\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb(\u865a\u8bfb)\uff1a\u540c\u4e00\u4e2a\u4e8b\u7269\uff0c\u8bfb\u53d6\u540c\u4e00\u4e2a\u6570\u636e\uff0c\u4e24\u6b21\u8bfb\u53d6\u7ed3\u679c\u4e0d\u4e00\u6837\uff1b\n#      3\u3001\u5e7b\u8bfb\uff1a\u4e00\u4e2a\u4e8b\u52a1\u64cd\u4f5c\u4e86\u67d0\u4e2a\u8bb0\u5f55\uff0c\u53e6\u4e00\u4e2a\u4e8b\u52a1\u540c\u6837\u64cd\u4f5c\u4e86\u8fd9\u4e2a\u8bb0\u5f55\uff0c\u7b2c\u4e00\u4e2a\u4e8b\u52a1\u67e5\u8be2\u4e0d\u5230\u81ea\u5df1\u7684\u4fee\u6539\n# \u9694\u79bb\u7ea7\u522b\n#      1\u3001read uncommitted\uff1a\u8bfb\u672a\u63d0\u4ea4\uff0c\u5b58\u5728\u95ee\u9898123\n#      2\u3001read committed\uff1a\u8bfb\u5df2\u63d0\u4ea4\uff0c\u5b58\u5728\u95ee\u989823\n#      3\u3001repeatable read\uff1a\u53ef\u91cd\u590d\u8bfb\uff0c\u5b58\u5728\u95ee\u98983\n#      4\u3001serializable\uff1a\u4e32\u884c\u5316\uff0c\u6ca1\u6709\u95ee\u9898\uff0c\u5f53\u6709\u5176\u4ed6\u4e8b\u52a1\u5f00\u542f\u65f6\uff0c\u4f1a\u963b\u585e\u7b49\u5f85\u5176\u4ed6\u4e8b\u52a1\u63d0\u4ea4\u540e\u518d\u6267\u884c\n#      \u8bbe\u7f6e\u9694\u79bb\u7ea7\u522b\u8d8a\u9ad8\uff0c\u5b89\u5168\u6027\u8d8a\u9ad8\uff0c\u4f46\u6027\u80fd\u8d8a\u5dee\uff0cMySQL\u9ed8\u8ba4\u9694\u79bb\u7ea7\u522b\u662frepeatable read\uff0cOracle\u7684\u9ed8\u8ba4\u7ea7\u522b\u662fread commited\n#  \u8bfb\u53d6\uff5c\u4fee\u6539\u9694\u79bb\u7ea7\u522b\n#      SELECT @@tx_isolation;\n#      SET GLOBAL TRANSACTION ISOLATION LEVEL READ xxx\n\n-- \u67e5\u770b\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\nSELECT @@tx_isolation;\n\n-- \u4fee\u6539\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\nSET GLOBAL TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;\n\n-- \u67e5\u770b\u81ea\u52a8\u4e8b\u52a1\u63d0\u4ea4\u72b6\u6001\nSELECT @@autocommit;\n\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\/*** \u4e8b\u52a1 ***\/ # \u5982\u679c\u4e00\u4e2a\u5305\u542b\u591a\u4e2a\u6b65\u9aa4\u7684\u4e1a\u52a1\u64cd\u4f5c\uff0c\u88ab\u4e8b\u52a1\u7ba1\u7406\uff0c\u90a3\u4e48\u8fd9\u4e9b\u64cd\u4f5c\u8981\u4e48\u540c\u65f6\u6210\u529f\uff0c\u8981\u4e48\u540c\u65f6\u5931\u8d25\u3002 # \u9ed8\u8ba4\u60c5\u51b5\u4e0b\u5355\u6761sql\u8bed\u53e5\u90fd\u662f\u81ea\u52a8\u63d0\u4ea4\u4e8b\u52a1 # \u64cd\u4f5c\uff1a # 1\u3001\u5f00\u542f\u4e8b\u52a1\uff1astart transaction # 2\u3001\u56de\u6eda\uff1arollback # 3\u3001\u63d0\u4ea4\uff1acommit # MySQL\u4e8b\u52a1\u9ed8\u8ba4\u7684\u63d0\u4ea4\u65b9\u5f0f\u662f\u81ea\u52a8\u63d0\u4ea4\uff0c\u5373\u6bcf\u6761SQL\u8bed\u53e5\u90fd\u662f\u4e00\u4e2a\u4e8b\u52a1 # \u67e5\u770b\u63d0\u4ea4\u65b9\u5f0f select @@autocommit SELECT @@autocommit; # \u4e8b\u52a1\u56db\u5927\u7279\u5f81 # 1\u3001\u539f\u5b50\u6027\uff1a\u4e0d\u53ef\u5206\u5272\u7684\u6700\u5c0f\u5355\u5143\uff0c\u8981\u4e48\u540c\u65f6\u6210\u529f\uff0c\u8981\u4e48\u540c\u65f6\u5931\u8d25 # 2\u3001\u6301\u4e45\u6027\uff1a\u5f53\u4e8b\u52a1\u63d0\u4ea4\u6216\u56de\u6eda\u540e\uff0c\u6570\u636e\u5e93\u5c06\u4f1a\u6301\u4e45\u5316\u5730\u4fdd\u5b58\u6570\u636e # 3\u3001\u9694\u79bb\u6027\uff1a\u591a\u4e2a\u4e8b\u52a1\u4e4b\u95f4\uff0c\u76f8\u4e92\u72ec\u7acb\u3002 # 4\u3001\u4e00\u81f4\u6027\uff1a\u4e8b\u52a1\u64cd\u4f5c\u7684\u524d\u540e\uff0c\u6570\u636e\u603b\u91cf\u4e0d\u53d8 # \u4e8b\u52a1\u7684\u9694\u79bb\u7ea7\u522b # \u6982\u5ff5\uff1a\u591a\u4e2a\u4e8b\u52a1\u662f\u9694\u79bb\u7684\uff0c\u4f46\u591a\u4e2a\u4e8b\u52a1\u64cd\u4f5c\u7684\u662f\u540c\u4e00\u6279\u6570\u636e\uff0c\u5219\u4f1a\u51fa\u73b0\u95ee\u9898\uff0c\u8bbe\u7f6e\u4e0d\u540c\u7684\u9694\u79bb\u7ea7\u522b\u6765\u89e3\u51b3\u8fd9\u4e9b\u95ee\u9898\uff1b # \u95ee\u9898\uff1a # 1\u3001\u810f\u8bfb\uff1a\u4e00\u4e2a\u4e8b\u52a1\u8bfb\u5230\u4e86\u53e6\u4e00\u4e2a\u4e8b\u52a1\u8fd8\u672a\u63d0\u4ea4\u7684\u6570\u636e\uff1b # 2\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb(\u865a\u8bfb)\uff1a\u540c\u4e00\u4e2a\u4e8b\u7269\uff0c\u8bfb\u53d6\u540c\u4e00\u4e2a\u6570\u636e\uff0c\u4e24\u6b21\u8bfb\u53d6\u7ed3\u679c\u4e0d\u4e00\u6837\uff1b # 3\u3001\u5e7b\u8bfb\uff1a\u4e00\u4e2a\u4e8b\u52a1\u64cd\u4f5c\u4e86\u67d0\u4e2a\u8bb0\u5f55\uff0c\u53e6\u4e00\u4e2a\u4e8b\u52a1\u540c\u6837\u64cd\u4f5c\u4e86\u8fd9\u4e2a\u8bb0\u5f55\uff0c\u7b2c\u4e00\u4e2a\u4e8b\u52a1\u67e5\u8be2\u4e0d\u5230\u81ea\u5df1\u7684\u4fee\u6539 # \u9694\u79bb\u7ea7\u522b # 1\u3001read uncommitted\uff1a\u8bfb\u672a\u63d0\u4ea4\uff0c\u5b58\u5728\u95ee\u9898123 # 2\u3001read committed\uff1a\u8bfb\u5df2\u63d0\u4ea4\uff0c\u5b58\u5728\u95ee\u989823 # [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[282],"tags":[22,285,284],"class_list":["post-1611","post","type-post","status-publish","format-standard","hentry","category-database","tag-mysql","tag-transaction","tag-284"],"_links":{"self":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts\/1611","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/comments?post=1611"}],"version-history":[{"count":0,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts\/1611\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/media?parent=1611"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/categories?post=1611"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/tags?post=1611"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}