{"id":5422,"date":"2024-11-14T12:13:01","date_gmt":"2024-11-14T04:13:01","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5422\/"},"modified":"2024-11-14T12:13:01","modified_gmt":"2024-11-14T04:13:01","slug":"mysql%e6%80%8e%e4%b9%88%e4%bc%98%e5%8c%96%e5%91%bd%e4%bb%a4","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5422\/","title":{"rendered":"mysql\u600e\u4e48\u4f18\u5316\u547d\u4ee4"},"content":{"rendered":"<blockquote><p>\n  \u901a\u8fc7\u4f7f\u7528\u7d22\u5f15\u3001\u5206\u6790\u67e5\u8be2\u3001\u907f\u514d\u4f7f\u7528 select *\u3001\u4f7f\u7528 limit \u5b50\u53e5\u3001\u4f18\u5316 where \u5b50\u53e5\u3001\u4f7f\u7528\u8fde\u63a5\u3001\u91cd\u5199\u6162\u67e5\u8be2\u548c\u8c03\u6574\u670d\u52a1\u5668\u914d\u7f6e\u7b49\u6280\u672f\uff0c\u53ef\u4ee5\u4f18\u5316 mysql \u67e5\u8be2\u547d\u4ee4\uff0c\u4ece\u800c\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u548c\u51cf\u5c11\u8d44\u6e90\u6d88\u8017\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202405\/28\/2024052812153349750.jpg\" class=\"aligncenter\" title=\"mysql\u600e\u4e48\u4f18\u5316\u547d\u4ee4\u63d2\u56fe\" alt=\"mysql\u600e\u4e48\u4f18\u5316\u547d\u4ee4\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u4f18\u5316 MySQL \u67e5\u8be2\u547d\u4ee4<\/strong><\/p>\n<p>MySQL \u6570\u636e\u5e93\u4e2d\u7684\u67e5\u8be2\u547d\u4ee4\u53ef\u80fd\u4f1a\u968f\u7740\u65f6\u95f4\u7684\u63a8\u79fb\u800c\u53d8\u5f97\u4f4e\u6548\u3002\u901a\u8fc7\u5b9e\u65bd\u4e00\u4e9b\u4f18\u5316\u6280\u672f\uff0c\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u67e5\u8be2\u7684\u6027\u80fd\u3002<\/p>\n<p><strong>1. \u4f7f\u7528\u7d22\u5f15<\/strong><\/p>\n<p>\u7d22\u5f15\u662f\u4e00\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u5b83\u53ef\u4ee5\u52a0\u5feb\u6570\u636e\u68c0\u7d22\u7684\u901f\u5ea6\u3002\u5728\u7ecf\u5e38\u9700\u8981\u67e5\u627e\u7684\u5217\u4e0a\u521b\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u5c06\u7ebf\u6027\u641c\u7d22\u8f6c\u6362\u4e3a\u4e8c\u5206\u67e5\u627e\uff0c\u4ece\u800c\u5927\u5927\u51cf\u5c11\u67e5\u627e\u65f6\u95f4\u3002<\/p>\n<p><strong>2. \u4f7f\u7528 EXPLAIN \u5206\u6790\u67e5\u8be2<\/strong><\/p>\n<p>EXPLAIN \u547d\u4ee4\u53ef\u4ee5\u663e\u793a MySQL \u5982\u4f55\u6267\u884c\u67e5\u8be2\u3002\u6b64\u4fe1\u606f\u53ef\u7528\u4e8e\u8bc6\u522b\u53ef\u4ee5\u4f18\u5316\u7684\u533a\u57df\u3002\u5b83\u63d0\u4f9b\u6709\u5173\u8bbf\u95ee\u8868\u987a\u5e8f\u3001\u4f7f\u7528\u7684\u7d22\u5f15\u4ee5\u53ca\u67e5\u8be2\u6267\u884c\u65f6\u95f4\u7684\u4fe1\u606f\u3002<\/p>\n<p><strong>3. \u907f\u514d\u4f7f\u7528 SELECT <\/strong>*<\/p>\n<p>\u4ec5\u9009\u62e9\u67e5\u8be2\u6240\u9700\u7684\u5217\uff0c\u800c\u4e0d\u662f\u4f7f\u7528 SELECT *\u3002\u8fd9\u51cf\u5c11\u4e86\u6570\u636e\u4f20\u8f93\u91cf\uff0c\u4ece\u800c\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n<p><strong>4. \u4f7f\u7528 LIMIT \u5b50\u53e5<\/strong><\/p>\n<p>LIMIT \u5b50\u53e5\u53ef\u4ee5\u9650\u5236\u8fd4\u56de\u7684\u884c\u6570\u3002\u8fd9\u5bf9\u4e8e\u53ea\u9700\u8981\u67e5\u8be2\u7279\u5b9a\u6570\u91cf\u7684\u884c\u65f6\u975e\u5e38\u6709\u7528\u3002<\/p>\n<p><strong>5. \u4f18\u5316 WHERE \u5b50\u53e5<\/strong><\/p>\n<ul>\n<li>\u4f7f\u7528\u7d22\u5f15\u8986\u76d6\u67e5\u8be2\uff0c\u5728 WHERE \u5b50\u53e5\u4e2d\u5305\u542b\u7d22\u5f15\u5217\u3002<\/li>\n<li>\u4f7f\u7528\u8303\u56f4\u67e5\u8be2\uff0c\u800c\u4e0d\u662f\u76f8\u7b49\u6027\u67e5\u8be2\u3002<\/li>\n<li>\u5c06 AND \u548c OR \u6761\u4ef6\u5206\u7ec4\uff0c\u4ee5\u51cf\u5c11\u8868\u8bbf\u95ee\u6b21\u6570\u3002<\/li>\n<\/ul>\n<p><strong>6. \u4f7f\u7528\u8fde\u63a5\u800c\u4e0d\u662f\u5b50\u67e5\u8be2<\/strong><\/p>\n<p>\u8fde\u63a5\u901a\u5e38\u6bd4\u5b50\u67e5\u8be2\u66f4\u6709\u6548\u3002\u5b50\u67e5\u8be2\u4f1a\u521b\u5efa\u4e34\u65f6\u8868\uff0c\u8fd9\u4f1a\u589e\u52a0\u5f00\u9500\u3002<\/p>\n<p><strong>7. \u91cd\u5199\u6162\u67e5\u8be2<\/strong><\/p>\n<p>\u5982\u679c\u67e5\u8be2\u4ecd\u7136\u5f88\u6162\uff0c\u5219\u9700\u8981\u91cd\u5199\u5b83\u3002\u8fd9\u53ef\u80fd\u5305\u62ec\u5206\u89e3\u590d\u6742\u7684\u67e5\u8be2\u3001\u521b\u5efa\u66f4\u6709\u6548\u7684\u7d22\u5f15\u6216\u4f7f\u7528\u4e0d\u540c\u7684\u7b97\u6cd5\u3002<\/p>\n<p><strong>8. \u8c03\u6574\u670d\u52a1\u5668\u914d\u7f6e<\/strong><\/p>\n<p>\u4e00\u4e9b MySQL \u670d\u52a1\u5668\u914d\u7f6e\u8bbe\u7f6e\u53ef\u4ee5\u5f71\u54cd\u67e5\u8be2\u6027\u80fd\u3002\u8c03\u6574\u7f13\u51b2\u6c60\u5927\u5c0f\u3001\u67e5\u8be2\u7f13\u5b58\u548c\u7ebf\u7a0b\u6c60\u5927\u5c0f\u53ef\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u600e\u4e48\u4f18\u5316\u547d\u4ee4\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u901a\u8fc7\u4f7f\u7528\u7d22\u5f15\u3001\u5206\u6790\u67e5\u8be2\u3001\u907f\u514d\u4f7f\u7528 select *\u3001\u4f7f\u7528 limit \u5b50\u53e5\u3001\u4f18\u5316 where \u5b50\u53e5\u3001\u4f7f\u7528\u8fde\u63a5\u3001\u91cd\u5199\u6162\u67e5\u8be2\u548c\u8c03\u6574\u670d\u52a1\u5668\u914d\u7f6e\u7b49\u6280\u672f\uff0c\u53ef\u4ee5\u4f18\u5316 mysql \u67e5\u8be2\u547d\u4ee4\uff0c\u4ece\u800c\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u548c\u51cf\u5c11\u8d44\u6e90\u6d88\u8017\u3002 \u5982\u4f55\u4f18\u5316 MySQL \u67e5\u8be2\u547d\u4ee4 MySQL \u6570\u636e\u5e93\u4e2d\u7684\u67e5\u8be2\u547d\u4ee4\u53ef\u80fd\u4f1a\u968f\u7740\u65f6\u95f4\u7684\u63a8\u79fb\u800c\u53d8\u5f97\u4f4e\u6548\u3002\u901a\u8fc7\u5b9e\u65bd\u4e00\u4e9b\u4f18\u5316\u6280\u672f\uff0c\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u67e5\u8be2\u7684\u6027\u80fd\u3002 1. \u4f7f\u7528\u7d22\u5f15 \u7d22\u5f15\u662f\u4e00\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u5b83\u53ef\u4ee5\u52a0\u5feb\u6570\u636e\u68c0\u7d22\u7684\u901f\u5ea6\u3002\u5728\u7ecf\u5e38\u9700\u8981\u67e5\u627e\u7684\u5217\u4e0a\u521b\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u5c06\u7ebf\u6027\u641c\u7d22\u8f6c\u6362\u4e3a\u4e8c\u5206\u67e5\u627e\uff0c\u4ece\u800c\u5927\u5927\u51cf\u5c11\u67e5\u627e\u65f6\u95f4\u3002 2. \u4f7f\u7528 EXPLAIN \u5206\u6790\u67e5\u8be2 EXPLAIN \u547d\u4ee4\u53ef\u4ee5\u663e\u793a MySQL \u5982\u4f55\u6267\u884c\u67e5\u8be2\u3002\u6b64\u4fe1\u606f\u53ef\u7528\u4e8e\u8bc6\u522b\u53ef\u4ee5\u4f18\u5316\u7684\u533a\u57df\u3002\u5b83\u63d0\u4f9b\u6709\u5173\u8bbf\u95ee\u8868\u987a\u5e8f\u3001\u4f7f\u7528\u7684\u7d22\u5f15\u4ee5\u53ca\u67e5\u8be2\u6267\u884c\u65f6\u95f4\u7684\u4fe1\u606f\u3002 3. \u907f\u514d\u4f7f\u7528 SELECT * \u4ec5\u9009\u62e9\u67e5\u8be2\u6240\u9700\u7684\u5217\uff0c\u800c\u4e0d\u662f\u4f7f\u7528 SELECT *\u3002\u8fd9\u51cf\u5c11\u4e86\u6570\u636e\u4f20\u8f93\u91cf\uff0c\u4ece\u800c\u63d0\u9ad8\u6027\u80fd\u3002 4. \u4f7f\u7528 LIMIT \u5b50\u53e5 LIMIT \u5b50\u53e5\u53ef\u4ee5\u9650\u5236\u8fd4\u56de\u7684\u884c\u6570\u3002\u8fd9\u5bf9\u4e8e\u53ea\u9700\u8981\u67e5\u8be2\u7279\u5b9a\u6570\u91cf\u7684\u884c\u65f6\u975e\u5e38\u6709\u7528\u3002 5. \u4f18\u5316 WHERE \u5b50\u53e5 \u4f7f\u7528\u7d22\u5f15\u8986\u76d6\u67e5\u8be2\uff0c\u5728 WHERE \u5b50\u53e5\u4e2d\u5305\u542b\u7d22\u5f15\u5217\u3002 \u4f7f\u7528\u8303\u56f4\u67e5\u8be2\uff0c\u800c\u4e0d\u662f\u76f8\u7b49\u6027\u67e5\u8be2\u3002 \u5c06 AND \u548c OR \u6761\u4ef6\u5206\u7ec4\uff0c\u4ee5\u51cf\u5c11\u8868\u8bbf\u95ee\u6b21\u6570\u3002 6. \u4f7f\u7528\u8fde\u63a5\u800c\u4e0d\u662f\u5b50\u67e5\u8be2 \u8fde\u63a5\u901a\u5e38\u6bd4\u5b50\u67e5\u8be2\u66f4\u6709\u6548\u3002\u5b50\u67e5\u8be2\u4f1a\u521b\u5efa\u4e34\u65f6\u8868\uff0c\u8fd9\u4f1a\u589e\u52a0\u5f00\u9500\u3002 7. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-5422","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5422","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=5422"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/5422\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=5422"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=5422"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=5422"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}