{"id":200873,"date":"2025-05-06T13:04:49","date_gmt":"2025-05-06T05:04:49","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200873\/"},"modified":"2025-05-06T13:04:49","modified_gmt":"2025-05-06T05:04:49","slug":"%e4%b8%ba%e4%bb%80%e4%b9%88-mysql-%e4%b8%ad-where-%e8%af%ad%e5%8f%a5%e6%97%a0%e6%b3%95%e7%9b%b4%e6%8e%a5%e7%94%a8-%e6%a3%80%e7%b4%a2%e5%b8%83%e5%b0%94%e5%80%bc%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200873\/","title":{"rendered":"\u4e3a\u4ec0\u4e48 MySQL \u4e2d WHERE \u8bed\u53e5\u65e0\u6cd5\u76f4\u63a5\u7528 = \u68c0\u7d22\u5e03\u5c14\u503c\uff1f"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>\u4e3a\u4ec0\u4e48 MySQL \u4e2d WHERE \u8bed\u53e5\u65e0\u6cd5\u76f4\u63a5\u7528 = \u68c0\u7d22\u5e03\u5c14\u503c\uff1f<\/h1>\n<p>\u5728\u6570\u636e\u5e93\u5b9e\u6218\u5f00\u53d1\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u4f1a\u9047\u5230\u4e00\u4e9b\u8fd9\u6837\u90a3\u6837\u7684\u95ee\u9898\uff0c\u7136\u540e\u8981\u5361\u597d\u534a\u5929\uff0c\u7b49\u95ee\u9898\u89e3\u51b3\u4e86\u624d\u53d1\u73b0\u539f\u6765\u4e00\u4e9b\u7ec6\u8282\u77e5\u8bc6\u70b9\u8fd8\u662f\u6ca1\u6709\u638c\u63e1\u597d\u3002\u4eca\u5929\u4e3b\u673a\u5b9d\u8d1d\u5c31\u6574\u7406\u5206\u4eab\u300a\u4e3a\u4ec0\u4e48 MySQL \u4e2d WHERE \u8bed\u53e5\u65e0\u6cd5\u76f4\u63a5\u7528 = \u68c0\u7d22\u5e03\u5c14\u503c\uff1f\u300b\uff0c\u804a\u804a\uff0c\u5e0c\u671b\u53ef\u4ee5\u5e2e\u52a9\u5230\u6b63\u5728\u52aa\u529b\u8d5a\u94b1\u7684\u4f60\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241118\/1731918117673af9250c4ef.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>\u4e3a\u4ec0\u4e48 MySQL \u7684 WHERE \u4e4b\u95f4\u65e0\u6cd5\u4f7f\u7528 = \u68c0\u7d22 bool \u6570\u503c\uff1f<\/strong><\/p>\n<p>\u5728 MySQL \u4e2d\u4f7f\u7528 WHERE \u8bed\u53e5\u65f6\uff0c\u786e\u5b9e\u65e0\u6cd5\u4f7f\u7528 = \u76f4\u63a5\u68c0\u7d22\u5e03\u5c14\u503c\u3002\u8fd9\u662f\u56e0\u4e3a\uff1a<\/p>\n<ul>\n<li><strong>\u679a\u4e3e\u7684\u7d22\u5f15\u4ece 1 \u5f00\u59cb\uff1a<\/strong>\u5728\u60a8\u63d0\u4f9b\u7684\u8868\u7ed3\u6784\u4e2d\uff0cis_svddb_match \u5217\u5b9a\u4e49\u4e3a\u4e00\u4e2a\u679a\u4e3e\u7c7b\u578b\uff0c\u5176\u503c &#8216;true&#8217; \u5177\u6709\u7d22\u5f15 1\uff0c\u800c\u503c &#8216;false&#8217; \u5177\u6709\u7d22\u5f15 2\u3002<\/li>\n<li><strong>= \u8fd0\u7b97\u7b26\u7528\u4e8e\u6bd4\u8f83\u503c\uff1a<\/strong>= \u8fd0\u7b97\u7b26\u7528\u4e8e\u6bd4\u8f83\u4e24\u4e2a\u503c\u662f\u5426\u76f8\u7b49\uff0c\u4f46\u4e0d\u80fd\u76f4\u63a5\u6bd4\u8f83\u5e03\u5c14\u503c\u3002<\/li>\n<\/ul>\n<p>\u56e0\u6b64\uff0c\u5bf9\u4e8e\u5e03\u5c14\u5217\uff0c\u4ee5\u4e0b\u662f\u6b63\u786e\u7684\u6bd4\u8f83\u65b9\u5f0f\uff1a<\/p>\n<ul>\n<li>WHERE is_svddb_match = &#8216;true&#8217;<\/li>\n<li>WHERE is_svddb_match = &#8216;false&#8217;<\/li>\n<\/ul>\n<p>\u5207\u52ff\u4f7f\u7528 WHERE is_svddb_match = 1 \u6216 WHERE is_svddb_match = 0\uff0c\u56e0\u4e3a\u8fd9\u4e9b\u6bd4\u8f83\u5c06\u59cb\u7ec8\u8fd4\u56de false\u3002<\/p>\n<p>\u5373\u4f7f\u5e03\u5c14\u503c\u5728 MySQL \u4e2d\u5b58\u50a8\u4e3a 1 \u548c 0\uff0c\u4f46\u76f4\u63a5\u4e0e\u6574\u6570\u6bd4\u8f83 enum \u503c\u4e5f\u4f1a\u5bfc\u81f4\u9519\u8bef\u3002\u56e0\u6b64\uff0c\u8bf7\u4f7f\u7528 &#8216;true&#8217; 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