{"id":175509,"date":"2024-11-08T06:28:17","date_gmt":"2024-11-07T22:28:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/175509\/"},"modified":"2024-11-08T06:28:18","modified_gmt":"2024-11-07T22:28:18","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e6%97%a5%e6%9c%9f%e7%b4%84%e6%9d%9f%e4%be%86%e6%8e%a7%e5%88%b6%e6%95%b8%e6%93%9a%e9%8c%84%e5%85%a5%ef%bc%9f-%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/175509\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528\u6578\u64da\u5eab\u65e5\u671f\u7d04\u675f\u4f86\u63a7\u5236\u6578\u64da\u9304\u5165\uff1f (\u6578\u64da\u5eab\u65e5\u671f\u7d04\u675f)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e6%97%a5%e6%9c%9f%e7%b4%84%e6%9d%9f%e4%be%86%e6%8e%a7%e5%88%b6%e6%95%b8%e6%93%9a%e9%8c%84%e5%85%a5%ef%bc%9f-NLxedDjzFG\">\u5982\u4f55\u4f7f\u7528\u6578\u64da\u5eab\u65e5\u671f\u7d04\u675f\u4f86\u63a7\u5236\u6578\u64da\u9304\u5165\uff1f<\/h1>\n<p>\u5728\u73fe\u4ee3\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u4e00\u81f4\u6027\u81f3\u95dc\u91cd\u8981\u3002\u7279\u5225\u662f\u5728\u6d89\u53ca\u65e5\u671f\u7684\u6578\u64da\u9304\u5165\u6642\uff0c\u4f7f\u7528\u65e5\u671f\u7d04\u675f\u53ef\u4ee5\u6709\u6548\u5730\u63a7\u5236\u6578\u64da\u7684\u6709\u6548\u6027\uff0c\u907f\u514d\u4e0d\u6b63\u78ba\u6216\u4e0d\u5408\u908f\u8f2f\u7684\u6578\u64da\u9032\u5165\u6578\u64da\u5eab\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528\u6578\u64da\u5eab\u65e5\u671f\u7d04\u675f\u4f86\u63a7\u5236\u6578\u64da\u9304\u5165\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e6%97%a5%e6%9c%9f%e7%b4%84%e6%9d%9f%ef%bc%9f-NLxedDjzFG\">\u4ec0\u9ebc\u662f\u65e5\u671f\u7d04\u675f\uff1f<\/h2>\n<p>\u65e5\u671f\u7d04\u675f\u662f\u6578\u64da\u5eab\u4e2d\u7528\u4f86\u9650\u5236\u65e5\u671f\u985e\u578b\u5b57\u6bb5\u7684\u6709\u6548\u6027\u7684\u4e00\u7a2e\u898f\u5247\u3002\u9019\u4e9b\u7d04\u675f\u53ef\u4ee5\u78ba\u4fdd\u7528\u6236\u8f38\u5165\u7684\u65e5\u671f\u7b26\u5408\u7279\u5b9a\u7684\u689d\u4ef6\uff0c\u4f8b\u5982\uff0c\u65e5\u671f\u4e0d\u80fd\u65e9\u65bc\u67d0\u500b\u7279\u5b9a\u65e5\u671f\uff0c\u6216\u8005\u5fc5\u9808\u5728\u67d0\u500b\u7bc4\u570d\u5167\u3002\u901a\u904e\u8a2d\u7f6e\u9019\u4e9b\u7d04\u675f\uff0c\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff08DBMS\uff09\u53ef\u4ee5\u81ea\u52d5\u6aa2\u67e5\u6578\u64da\u7684\u6709\u6548\u6027\uff0c\u5f9e\u800c\u6e1b\u5c11\u932f\u8aa4\u6578\u64da\u7684\u9304\u5165\u3002<\/p>\n<h2 id=\"%e5%b8%b8%e8%a6%8b%e7%9a%84%e6%97%a5%e6%9c%9f%e7%b4%84%e6%9d%9f%e9%a1%9e%e5%9e%8b-NLxedDjzFG\">\u5e38\u898b\u7684\u65e5\u671f\u7d04\u675f\u985e\u578b<\/h2>\n<ul>\n<li><strong>NOT NULL \u7d04\u675f\uff1a<\/strong>\u78ba\u4fdd\u65e5\u671f\u5b57\u6bb5\u4e0d\u80fd\u70ba\u7a7a\u3002<\/li>\n<li><strong>CHECK \u7d04\u675f\uff1a<\/strong>\u5141\u8a31\u7528\u6236\u5b9a\u7fa9\u81ea\u8a02\u7684\u689d\u4ef6\uff0c\u4f8b\u5982\uff0c\u65e5\u671f\u5fc5\u9808\u5728\u67d0\u500b\u7bc4\u570d\u5167\u3002<\/li>\n<li><strong>DEFAULT \u7d04\u675f\uff1a<\/strong>\u70ba\u65e5\u671f\u5b57\u6bb5\u8a2d\u7f6e\u9ed8\u8a8d\u503c\uff0c\u4f8b\u5982\uff0c\u7576\u7528\u6236\u672a\u63d0\u4f9b\u65e5\u671f\u6642\uff0c\u81ea\u52d5\u586b\u5165\u7576\u524d\u65e5\u671f\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%af%a6%e7%8f%be%e6%97%a5%e6%9c%9f%e7%b4%84%e6%9d%9f-NLxedDjzFG\">\u5982\u4f55\u5be6\u73fe\u65e5\u671f\u7d04\u675f<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f7f\u7528 SQL \u8a9e\u53e5\u4f86\u8a2d\u7f6e\u65e5\u671f\u7d04\u675f\u7684\u793a\u4f8b\uff1a<\/p>\n<h3 id=\"1-not-null-%e7%b4%84%e6%9d%9f-NLxedDjzFG\">1. NOT NULL \u7d04\u675f<\/h3>\n<pre><code>CREATE TABLE \u4e8b\u4ef6 (\n    \u4e8b\u4ef6ID INT PRIMARY KEY,\n    \u4e8b\u4ef6\u540d\u7a31 VARCHAR(100),\n    \u4e8b\u4ef6\u65e5\u671f DATE NOT NULL\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u4e8b\u4ef6\u65e5\u671f\u5b57\u6bb5\u88ab\u8a2d\u7f6e\u70ba NOT NULL\uff0c\u9019\u610f\u5473\u8457\u6bcf\u500b\u4e8b\u4ef6\u90fd\u5fc5\u9808\u6709\u4e00\u500b\u6709\u6548\u7684\u65e5\u671f\u3002<\/p>\n<h3 id=\"2-check-%e7%b4%84%e6%9d%9f-NLxedDjzFG\">2. CHECK \u7d04\u675f<\/h3>\n<pre><code>CREATE TABLE \u6703\u8b70 (\n    \u6703\u8b70ID INT PRIMARY KEY,\n    \u6703\u8b70\u540d\u7a31 VARCHAR(100),\n    \u958b\u59cb\u65e5\u671f DATE,\n    \u7d50\u675f\u65e5\u671f DATE,\n    CHECK (\u7d50\u675f\u65e5\u671f &gt;= \u958b\u59cb\u65e5\u671f)\n);<\/code><\/pre>\n<p>\u9019\u500b\u793a\u4f8b\u4e2d\uff0cCHECK \u7d04\u675f\u78ba\u4fdd\u7d50\u675f\u65e5\u671f\u5fc5\u9808\u665a\u65bc\u6216\u7b49\u65bc\u958b\u59cb\u65e5\u671f\uff0c\u5f9e\u800c\u907f\u514d\u4e86\u4e0d\u5408\u908f\u8f2f\u7684\u65e5\u671f\u9304\u5165\u3002<\/p>\n<h3 id=\"3-default-%e7%b4%84%e6%9d%9f-NLxedDjzFG\">3. DEFAULT \u7d04\u675f<\/h3>\n<pre><code>CREATE TABLE \u4efb\u52d9 (\n    \u4efb\u52d9ID INT PRIMARY KEY,\n    \u4efb\u52d9\u540d\u7a31 VARCHAR(100),\n    \u622a\u6b62\u65e5\u671f DATE DEFAULT CURRENT_DATE\n);<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c\u622a\u6b62\u65e5\u671f\u5b57\u6bb5\u88ab\u8a2d\u7f6e\u70ba\u9ed8\u8a8d\u70ba\u7576\u524d\u65e5\u671f\uff0c\u9019\u6a23\u7576\u7528\u6236\u672a\u63d0\u4f9b\u622a\u6b62\u65e5\u671f\u6642\uff0c\u7cfb\u7d71\u6703\u81ea\u52d5\u586b\u5165\u7576\u524d\u65e5\u671f\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e6%97%a5%e6%9c%9f%e7%b4%84%e6%9d%9f%e7%9a%84%e5%a5%bd%e8%99%95-NLxedDjzFG\">\u4f7f\u7528\u65e5\u671f\u7d04\u675f\u7684\u597d\u8655<\/h2>\n<p>\u4f7f\u7528\u65e5\u671f\u7d04\u675f\u6709\u591a\u500b\u597d\u8655\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>\u63d0\u9ad8\u6578\u64da\u8cea\u91cf\uff1a<\/strong>\u901a\u904e\u9650\u5236\u4e0d\u5408\u908f\u8f2f\u7684\u6578\u64da\u9304\u5165\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u6e96\u78ba\u6027\u3002<\/li>\n<li><strong>\u6e1b\u5c11\u932f\u8aa4\uff1a<\/strong>\u81ea\u52d5\u6aa2\u67e5\u6578\u64da\u6709\u6548\u6027\uff0c\u6e1b\u5c11\u4eba\u5de5\u6aa2\u67e5\u7684\u9700\u8981\u3002<\/li>\n<li><strong>\u589e\u5f37\u6578\u64da\u4e00\u81f4\u6027\uff1a<\/strong>\u78ba\u4fdd\u6240\u6709\u9304\u5165\u7684\u6578\u64da\u9075\u5faa\u76f8\u540c\u7684\u898f\u5247\u548c\u6a19\u6e96\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-NLxedDjzFG\">\u7d50\u8ad6<\/h2>\n<p>\u5728\u6578\u64da\u5eab\u8a2d\u8a08\u4e2d\uff0c\u4f7f\u7528\u65e5\u671f\u7d04\u675f\u662f\u4e00\u7a2e\u6709\u6548\u7684\u65b9\u5f0f\u4f86\u63a7\u5236\u6578\u64da\u9304\u5165\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u4e00\u81f4\u6027\u3002\u901a\u904e\u8a2d\u7f6e NOT NULL\u3001CHECK \u548c DEFAULT \u7b49\u7d04\u675f\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u9632\u6b62\u4e0d\u6b63\u78ba\u7684\u6578\u64da\u9032\u5165\u6578\u64da\u5eab\u3002\u9019\u4e0d\u50c5\u63d0\u9ad8\u4e86\u6578\u64da\u8cea\u91cf\uff0c\u9084\u6e1b\u5c11\u4e86\u5f8c\u7e8c\u6578\u64da\u8655\u7406\u4e2d\u7684\u932f\u8aa4\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u61c9\u7528\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u3002\u7121\u8ad6\u662f\u5c0f\u578b\u4f01\u696d\u9084\u662f\u5927\u578b\u4f01\u696d\uff0c\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u6027\u80fd\u548c\u5b89\u5168\u7684\u74b0\u5883\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5229\u7528\u6578\u64da\u5eab\u65e5\u671f\u7d04\u675f\u4f86\u6709\u6548\u63a7\u5236\u6578\u64da\u9304\u5165\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u4e00\u81f4\u6027\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-175509","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175509","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=175509"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175509\/revisions"}],"predecessor-version":[{"id":175510,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175509\/revisions\/175510"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=175509"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=175509"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=175509"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}