{"id":190392,"date":"2024-11-12T12:12:18","date_gmt":"2024-11-12T04:12:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/190392\/"},"modified":"2024-11-12T12:12:19","modified_gmt":"2024-11-12T04:12:19","slug":"%e7%82%badb2%e6%95%b8%e6%93%9a%e5%ba%ab%e6%b7%bb%e5%8a%a0%e9%a9%97%e8%ad%89%e7%b4%84%e6%9d%9f%e5%a6%82%e4%bd%95%e8%bc%95%e9%ac%86%e6%8e%8c%e6%8f%a1%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/190392\/","title":{"rendered":"\u70baDB2\u6578\u64da\u5eab\u6dfb\u52a0\u9a57\u8b49\u7d04\u675f\u5982\u4f55\u8f15\u9b06\u638c\u63e1\uff1f"},"content":{"rendered":"<h1 id=\"%e7%82%badb2%e6%95%b8%e6%93%9a%e5%ba%ab%e6%b7%bb%e5%8a%a0%e9%a9%97%e8%ad%89%e7%b4%84%e6%9d%9f%e5%a6%82%e4%bd%95%e8%bc%95%e9%ac%86%e6%8e%8c%e6%8f%a1%ef%bc%9f-NswSvMJQyC\">\u70baDB2\u6578\u64da\u5eab\u6dfb\u52a0\u9a57\u8b49\u7d04\u675f\u5982\u4f55\u8f15\u9b06\u638c\u63e1\uff1f<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u9a57\u8b49\u7d04\u675f\u662f\u78ba\u4fdd\u6578\u64da\u5b8c\u6574\u6027\u548c\u6e96\u78ba\u6027\u7684\u91cd\u8981\u5de5\u5177\u3002\u5c0d\u65bc\u4f7f\u7528IBM DB2\u6578\u64da\u5eab\u7684\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u4f86\u8aaa\uff0c\u638c\u63e1\u5982\u4f55\u6dfb\u52a0\u548c\u7ba1\u7406\u9019\u4e9b\u7d04\u675f\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eDB2\u6578\u64da\u5eab\u4e2d\u7684\u9a57\u8b49\u7d04\u675f\uff0c\u4e26\u63d0\u4f9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u6b65\u9a5f\uff0c\u5e6b\u52a9\u60a8\u8f15\u9b06\u638c\u63e1\u9019\u4e00\u6280\u8853\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e9%a9%97%e8%ad%89%e7%b4%84%e6%9d%9f%ef%bc%9f-NswSvMJQyC\">\u4ec0\u9ebc\u662f\u9a57\u8b49\u7d04\u675f\uff1f<\/h2>\n<p>\u9a57\u8b49\u7d04\u675f\u662f\u7528\u4f86\u9650\u5236\u6578\u64da\u8868\u4e2d\u6578\u64da\u7684\u985e\u578b\u3001\u7bc4\u570d\u548c\u683c\u5f0f\u7684\u898f\u5247\u3002\u9019\u4e9b\u7d04\u675f\u53ef\u4ee5\u9632\u6b62\u4e0d\u6b63\u78ba\u6216\u4e0d\u4e00\u81f4\u7684\u6578\u64da\u9032\u5165\u6578\u64da\u5eab\uff0c\u5f9e\u800c\u63d0\u9ad8\u6578\u64da\u7684\u8cea\u91cf\u3002DB2\u652f\u6301\u591a\u7a2e\u9a57\u8b49\u7d04\u675f\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>NOT NULL<\/strong>\uff1a\u78ba\u4fdd\u67d0\u500b\u5b57\u6bb5\u4e0d\u80fd\u70ba\u7a7a\u3002<\/li>\n<li><strong>UNIQUE<\/strong>\uff1a\u78ba\u4fdd\u67d0\u500b\u5b57\u6bb5\u7684\u503c\u5728\u6574\u500b\u8868\u4e2d\u662f\u552f\u4e00\u7684\u3002<\/li>\n<li><strong>CHECK<\/strong>\uff1a\u78ba\u4fdd\u67d0\u500b\u5b57\u6bb5\u7684\u503c\u7b26\u5408\u7279\u5b9a\u689d\u4ef6\u3002<\/li>\n<li><strong>PRIMARY KEY<\/strong>\uff1a\u552f\u4e00\u6a19\u8b58\u8868\u4e2d\u7684\u6bcf\u4e00\u884c\uff0c\u4e26\u4e14\u4e0d\u80fd\u70ba\u7a7a\u3002<\/li>\n<li><strong>FOREIGN KEY<\/strong>\uff1a\u78ba\u4fdd\u67d0\u500b\u5b57\u6bb5\u7684\u503c\u5fc5\u9808\u5728\u53e6\u4e00\u500b\u8868\u4e2d\u5b58\u5728\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%9c%a8db2%e4%b8%ad%e6%b7%bb%e5%8a%a0%e9%a9%97%e8%ad%89%e7%b4%84%e6%9d%9f-NswSvMJQyC\">\u5982\u4f55\u5728DB2\u4e2d\u6dfb\u52a0\u9a57\u8b49\u7d04\u675f<\/h2>\n<p>\u5728DB2\u4e2d\uff0c\u60a8\u53ef\u4ee5\u5728\u5275\u5efa\u8868\u6642\u6216\u5728\u8868\u5275\u5efa\u5f8c\u6dfb\u52a0\u9a57\u8b49\u7d04\u675f\u3002\u4ee5\u4e0b\u662f\u5169\u7a2e\u5e38\u898b\u7684\u65b9\u6cd5\uff1a<\/p>\n<h3 id=\"1-%e5%9c%a8%e5%89%b5%e5%bb%ba%e8%a1%a8%e6%99%82%e6%b7%bb%e5%8a%a0%e7%b4%84%e6%9d%9f-NswSvMJQyC\">1. \u5728\u5275\u5efa\u8868\u6642\u6dfb\u52a0\u7d04\u675f<\/h3>\n<pre><code>CREATE TABLE Employees (\n    EmployeeID INT NOT NULL PRIMARY KEY,\n    FirstName VARCHAR(50) NOT NULL,\n    LastName VARCHAR(50) NOT NULL,\n    Email VARCHAR(100) UNIQUE,\n    Salary DECIMAL(10, 2) CHECK (Salary &gt; 0)\n);<\/code><\/pre>\n<p>\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70baEmployees\u7684\u8868\uff0c\u4e26\u5728\u5275\u5efa\u6642\u6dfb\u52a0\u4e86\u591a\u500b\u7d04\u675f\uff0c\u5305\u62ec\u4e3b\u9375\u3001\u552f\u4e00\u7d04\u675f\u548c\u6aa2\u67e5\u7d04\u675f\u3002<\/p>\n<h3 id=\"2-%e5%9c%a8%e5%b7%b2%e5%ad%98%e5%9c%a8%e7%9a%84%e8%a1%a8%e4%b8%ad%e6%b7%bb%e5%8a%a0%e7%b4%84%e6%9d%9f-NswSvMJQyC\">2. \u5728\u5df2\u5b58\u5728\u7684\u8868\u4e2d\u6dfb\u52a0\u7d04\u675f<\/h3>\n<pre><code>ALTER TABLE Employees\nADD CONSTRAINT chk_Salary CHECK (Salary &gt; 0);<\/code><\/pre>\n<p>\u5982\u679c\u60a8\u9700\u8981\u5728\u5df2\u5b58\u5728\u7684\u8868\u4e2d\u6dfb\u52a0\u7d04\u675f\uff0c\u53ef\u4ee5\u4f7f\u7528ALTER TABLE\u8a9e\u53e5\u3002\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u70baEmployees\u8868\u6dfb\u52a0\u4e86\u4e00\u500b\u6aa2\u67e5\u7d04\u675f\uff0c\u4ee5\u78ba\u4fdd\u85aa\u6c34\u5927\u65bc\u96f6\u3002<\/p>\n<h2 id=\"%e9%a9%97%e8%ad%89%e7%b4%84%e6%9d%9f%e7%9a%84%e7%ae%a1%e7%90%86-NswSvMJQyC\">\u9a57\u8b49\u7d04\u675f\u7684\u7ba1\u7406<\/h2>\n<p>\u5728DB2\u4e2d\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u4f86\u67e5\u770b\u548c\u7ba1\u7406\u9a57\u8b49\u7d04\u675f\uff1a<\/p>\n<ul>\n<li><strong>\u67e5\u770b\u7d04\u675f<\/strong>\uff1a\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\u4f86\u67e5\u770b\u8868\u4e2d\u7684\u6240\u6709\u7d04\u675f\u3002<\/li>\n<\/ul>\n<pre><code>SELECT * FROM SYSIBM.SYSCHECKS WHERE TABNAME = 'EMPLOYEES';<\/code><\/pre>\n<ul>\n<li><strong>\u522a\u9664\u7d04\u675f<\/strong>\uff1a\u5982\u679c\u9700\u8981\u522a\u9664\u67d0\u500b\u7d04\u675f\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u3002<\/li>\n<\/ul>\n<pre><code>ALTER TABLE Employees\nDROP CONSTRAINT chk_Salary;<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u548c\u8abf\u6574\u6578\u64da\u5eab\u4e2d\u7684\u7d04\u675f\uff0c\u4ee5\u9069\u61c9\u696d\u52d9\u9700\u6c42\u7684\u8b8a\u5316\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-NswSvMJQyC\">\u7d50\u8ad6<\/h2>\n<p>\u638c\u63e1DB2\u6578\u64da\u5eab\u4e2d\u7684\u9a57\u8b49\u7d04\u675f\u5c0d\u65bc\u78ba\u4fdd\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u6e96\u78ba\u6027\u81f3\u95dc\u91cd\u8981\u3002\u901a\u904e\u672c\u6587\u63d0\u4f9b\u7684\u793a\u4f8b\u548c\u6b65\u9a5f\uff0c\u60a8\u53ef\u4ee5\u8f15\u9b06\u5730\u5728DB2\u4e2d\u6dfb\u52a0\u548c\u7ba1\u7406\u9019\u4e9b\u7d04\u675f\u3002\u7121\u8ad6\u662f\u5728\u5275\u5efa\u65b0\u8868\u6642\u9084\u662f\u5c0d\u73fe\u6709\u8868\u9032\u884c\u4fee\u6539\uff0c\u6b63\u78ba\u4f7f\u7528\u9a57\u8b49\u7d04\u675f\u90fd\u80fd\u5e6b\u52a9\u60a8\u7dad\u8b77\u9ad8\u8cea\u91cf\u7684\u6578\u64da\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 <a href=\"https:\/\/server.hk\">VPS<\/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\u7684\u5ba2\u6236\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u8f15\u9b06\u70baDB2\u6578\u64da\u5eab\u6dfb\u52a0\u9a57\u8b49\u7d04\u675f\uff0c\u63d0\u5347\u6578\u64da\u5b8c\u6574\u6027\u8207\u5b89\u5168\u6027\uff0c\u78ba\u4fdd\u6578\u64da\u8cea\u91cf\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-190392","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/190392","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=190392"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/190392\/revisions"}],"predecessor-version":[{"id":190393,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/190392\/revisions\/190393"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=190392"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=190392"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=190392"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}