{"id":199660,"date":"2025-05-06T10:51:48","date_gmt":"2025-05-06T02:51:48","guid":{"rendered":"https:\/\/server.hk\/cnblog\/199660\/"},"modified":"2025-05-06T10:51:48","modified_gmt":"2025-05-06T02:51:48","slug":"%e4%bd%bf%e7%94%a8update%e5%91%bd%e4%bb%a4","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/199660\/","title":{"rendered":"\u4f7f\u7528update\u547d\u4ee4"},"content":{"rendered":"<p><b><\/b> <\/p>\n<h1>\u4f7f\u7528update\u547d\u4ee4<\/h1>\n<p>\u73cd\u60dc\u65f6\u95f4\uff0c\u52e4\u594b\u5b66\u4e60\uff01\u4eca\u5929\u7ed9\u5927\u5bb6\u5e26\u6765\uff0c\u6b63\u6587\u5185\u5bb9\u4e3b\u8981\u6d89\u53ca\u5230\u7b49\u7b49\uff0c\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60\uff0c\u6216\u8005\u662f\u5bf9\u6709\u7591\u95ee\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u6211\uff01\u540e\u9762\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u5185\u5bb9\u7684\uff0c\u5e0c\u671b\u90fd\u80fd\u5e2e\u5230\u6b63\u5728\u5b66\u4e60\u7684\u5927\u5bb6\uff01<\/p>\n<p>Update\u7684\u7528\u6cd5\uff0c\u9700\u8981\u5177\u4f53\u4ee3\u7801\u793a\u4f8b<\/p>\n<p>\u5728\u7f16\u7a0b\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u9700\u8981\u5bf9\u6570\u636e\u8fdb\u884c\u66f4\u65b0\u64cd\u4f5c\u3002\u5728\u8bb8\u591a\u7f16\u7a0b\u8bed\u8a00\u548c\u6570\u636e\u5e93\u4e2d\uff0c\u90fd\u63d0\u4f9b\u4e86update\u8bed\u53e5\u6216\u8005update\u51fd\u6570\u6765\u5b9e\u73b0\u6570\u636e\u7684\u66f4\u65b0\u529f\u80fd\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u4eec\u5c06\u4ecb\u7ecdupdate\u7684\u7528\u6cd5\uff0c\u5e76\u63d0\u4f9b\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\u6765\u5e2e\u52a9\u8bfb\u8005\u66f4\u597d\u5730\u638c\u63e1\u8fd9\u4e00\u6280\u672f\u3002<\/p>\n<p>\u4e00\u3001update\u7684\u57fa\u672c\u8bed\u6cd5<\/p>\n<p>\u5728\u5927\u591a\u6570\u7f16\u7a0b\u8bed\u8a00\u548c\u6570\u636e\u5e93\u4e2d\uff0cupdate\u7684\u57fa\u672c\u8bed\u6cd5\u901a\u5e38\u662f\u76f8\u4f3c\u7684\uff0c\u4f8b\u5982\u5728MySQL\u6570\u636e\u5e93\u4e2d\uff0cupdate\u7684\u8bed\u6cd5\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre>UPDATE table_name\nSET column1 = value1, column2 = value2, ...\nWHERE condition;<\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u8bed\u6cd5\u4e2d\uff0ctable_name\u8868\u793a\u8981\u66f4\u65b0\u7684\u6570\u636e\u8868\u7684\u540d\u79f0\uff0ccolumn1\u3001column2\u7b49\u8868\u793a\u8981\u66f4\u65b0\u7684\u5b57\u6bb5\u540d\u79f0\uff0cvalue1\u3001value2\u7b49\u8868\u793a\u8981\u66f4\u65b0\u7684\u5b57\u6bb5\u7684\u65b0\u503c\uff0c\u800cWHERE condition\u5219\u662f\u53ef\u9009\u7684\uff0c\u7528\u4e8e\u6307\u5b9a\u66f4\u65b0\u7684\u6761\u4ef6\u3002<\/p>\n<p>\u5728\u50cfJavaScript\u8fd9\u6837\u7684\u7f16\u7a0b\u8bed\u8a00\u4e2d\uff0cupdate\u7684\u8bed\u6cd5\u53ef\u80fd\u4f1a\u6709\u6240\u4e0d\u540c\uff0c\u4f8b\u5982\u5728React\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528setState\u51fd\u6570\u6765\u66f4\u65b0\u7ec4\u4ef6\u7684\u72b6\u6001\uff0c\u5177\u4f53\u7684\u8bed\u6cd5\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre>this.setState({ key: value });<\/pre>\n<p>\u4e8c\u3001update\u7684\u793a\u4f8b\u4ee3\u7801<\/p>\n<p>\u4e3a\u4e86\u66f4\u597d\u5730\u7406\u89e3update\u7684\u7528\u6cd5\uff0c\u6211\u4eec\u5c06\u63d0\u4f9b\u4e24\u4e2a\u793a\u4f8b\u4ee3\u7801\u6765\u6f14\u793a\u5b9e\u9645\u5e94\u7528\u3002<\/p>\n<ol>\n<li>MySQL\u6570\u636e\u5e93\u4e2d\u7684update\u793a\u4f8b<\/li>\n<\/ol>\n<p>\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u540d\u4e3astudents\u7684\u6570\u636e\u8868\uff0c\u5176\u4e2d\u5305\u542b\u4e86\u5b66\u751f\u7684\u59d3\u540d\u3001\u5e74\u9f84\u548c\u6210\u7ee9\u4fe1\u606f\u3002\u73b0\u5728\uff0c\u6211\u4eec\u9700\u8981\u5c06\u59d3\u540d\u4e3a&#8221;Tom&#8221;\u7684\u5b66\u751f\u7684\u6210\u7ee9\u66f4\u65b0\u4e3a90\u3002<\/p>\n<p>\u9996\u5148\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u7684SQL\u8bed\u53e5\u6765\u66f4\u65b0\u6570\u636e\uff1a<\/p>\n<pre>UPDATE students\nSET score = 90\nWHERE name = 'Tom';<\/pre>\n<ol>\n<li>React\u4e2d\u7684update\u793a\u4f8b<\/li>\n<\/ol>\n<p>\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u540d\u4e3aCounter\u7684\u7ec4\u4ef6\uff0c\u5176\u4e2d\u5305\u542b\u4e00\u4e2a\u8ba1\u6570\u5668\u7684\u503c\u3002<\/p>\n<p>\u73b0\u5728\uff0c\u6211\u4eec\u9700\u8981\u5728\u7528\u6237\u70b9\u51fb\u6309\u94ae\u65f6\u5c06\u8ba1\u6570\u5668\u7684\u503c\u52a01\u3002<\/p>\n<p>\u9996\u5148\uff0c\u5728\u7ec4\u4ef6\u7684\u6784\u9020\u51fd\u6570\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u521d\u59cb\u5316\u8ba1\u6570\u5668\u7684\u503c\u4e3a0\uff1a<\/p>\n<pre>constructor(props) {\n  super(props);\n  \n  this.state = {\n    count: 0\n  };\n}<\/pre>\n<p>\u63a5\u4e0b\u6765\uff0c\u5728\u6309\u94ae\u7684\u70b9\u51fb\u4e8b\u4ef6\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528setState\u51fd\u6570\u6765\u66f4\u65b0\u8ba1\u6570\u5668\u7684\u503c\uff1a<\/p>\n<pre>handleClick() {\n  this.setState({ count: this.state.count + 1 });\n}<\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4ee3\u7801\u4e2d\uff0csetState\u51fd\u6570\u63a5\u53d7\u4e00\u4e2a\u5bf9\u8c61\u53c2\u6570\uff0c\u5176\u4e2d\u5305\u542b\u6211\u4eec\u8981\u66f4\u65b0\u7684\u72b6\u6001\u7684\u952e\u503c\u5bf9\u3002<\/p>\n<p>\u4e09\u3001\u603b\u7ed3<\/p>\n<p>\u5728\u672c\u6587\u4e2d\uff0c\u6211\u4eec\u4ecb\u7ecd\u4e86update\u7684\u57fa\u672c\u7528\u6cd5\uff0c\u5e76\u63d0\u4f9b\u4e86\u5177\u4f53\u7684\u4ee3\u7801\u793a\u4f8b\uff0c\u5206\u522b\u6f14\u793a\u4e86\u5728MySQL\u6570\u636e\u5e93\u548cReact\u4e2d\u5982\u4f55\u4f7f\u7528update\u6765\u66f4\u65b0\u6570\u636e\u3002<\/p>\n<p>\u65e0\u8bba\u662f\u5728\u6570\u636e\u5e93\u4e2d\u66f4\u65b0\u6570\u636e\uff0c\u8fd8\u662f\u5728\u7f16\u7a0b\u4e2d\u66f4\u65b0\u72b6\u6001\uff0c\u638c\u63e1update\u7684\u7528\u6cd5\u5bf9\u4e8e\u7f16\u7a0b\u5f00\u53d1\u90fd\u662f\u81f3\u5173\u91cd\u8981\u7684\u3002\u5e0c\u671b\u672c\u6587\u7684\u5185\u5bb9\u5bf9\u8bfb\u8005\u80fd\u591f\u6709\u6240\u5e2e\u52a9\uff0c\u540c\u65f6\u4e5f\u5e0c\u671b\u8bfb\u8005\u80fd\u591f\u5728\u5b9e\u9645\u9879\u76ee\u4e2d\u7075\u6d3b\u8fd0\u7528update\u6765\u5b9e\u73b0\u6570\u636e\u7684\u52a8\u6001\u66f4\u65b0\u3002<\/p>\n<p>\u4eca\u5929\u5173\u4e8e\u300a\u4f7f\u7528update\u547d\u4ee4\u300b\u7684\u5185\u5bb9\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\uff0c\u5982\u679c\u6709\u4ec0\u4e48\u7591\u95ee\u6216\u8005\u5efa\u8bae\uff0c\u53ef\u4ee5\u5728\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\u4e0b\u591a\u591a\u56de\u590d\u4ea4\u6d41\uff1b\u6587\u4e2d\u82e5\u6709\u4e0d\u6b63\u4e4b\u5904\uff0c\u4e5f\u5e0c\u671b\u56de\u590d\u7559\u8a00\u4ee5\u544a\u77e5\uff01<\/p>\n<dl>\n<dt>\n 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