{"id":10007026,"date":"2022-12-28T11:28:09","date_gmt":"2022-12-28T03:28:09","guid":{"rendered":"https:\/\/ityet.com\/?p=10007026"},"modified":"2022-12-28T11:28:09","modified_gmt":"2022-12-28T03:28:09","slug":"%e9%9d%a2%e8%af%95%e5%ae%98%e9%97%ae%ef%bc%9a%e4%b8%ba%e5%95%a5%e4%b8%8d%e5%bb%ba%e8%ae%ae%e4%bd%bf%e7%94%a8-select-%ef%bc%9f%e8%af%b7%e4%bd%a0%e5%a4%a7%e5%a3%b0%e5%9c%b0%e5%9b%9e%e7%ad%94%e4%bb%96","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10007026","title":{"rendered":"\u9762\u8bd5\u5b98\u95ee\uff1a\u4e3a\u5565\u4e0d\u5efa\u8bae\u4f7f\u7528 Select *\uff1f\u8bf7\u4f60\u5927\u58f0\u5730\u56de\u7b54\u4ed6\uff01\uff01"},"content":{"rendered":"<p>\u4f5c\u8005\uff1a\u5c0f\u76ee\u6807\u9752\u5e74\/<br \/>\u6765\u6e90\uff1a<a href=\"https:\/\/link.segmentfault.com\/?enc=DXmVmExGHuHI3sxhh7TiTw%3D%3D.L3%2FbxnKo1E8nuv2O8axx8MntPX9J7yOZpq91ZrE%2F%2BkcWA6dSb%2F9zXkFUmGVqStx7ltHSMNNndJUp8vkf3FZDDA%3D%3D\" rel=\"nofollow\">https:\/\/blog.csdn.net\/qq_3538&#8230;<\/a><\/p>\n<h2>\u524d\u8a00<\/h2>\n<blockquote><p>\u4e0d\u5efa\u8bae\u4f7f\u7528 select  *<\/p><\/blockquote>\n<p>\u8fd9\u51e0\u4e2a\u5b57\u773c\uff0c\u505a\u5f00\u53d1\u7684\u90fd\u4e0d\u964c\u751f\u5427\u3002<\/p>\n<p>\u963f\u91cc\u7684\u5f00\u53d1\u624b\u518c\u4e0a\u9762\u4e5f\u662f\u6709\u63d0\u5230\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc5mgy\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u8fd9\u4e2a\u5b8c\u6574\u7248\u53ef\u4ee5\u5173\u6ce8\u516c\u4f17\u53f7Java\u6838\u5fc3\u6280\u672f\uff0c\u7136\u540e\u5728\u516c\u4f17\u53f7\u540e\u53f0\u56de\u590d<em>\u624b\u518c<\/em>\u83b7\u53d6\u3002<\/p>\n<p>\u6628\u665a\u6536\u5230\u4e00\u4e2a\u5c0f\u5144\u5f1f\u7684\u53cd\u9988\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc5mgz\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u968f\u540e\u4e5f\u95ee\u4e86\u4e0b\u5b66\u4e60\u7fa4\u91cc\u7684\u5144\u5f1f\u4eec\uff0c<\/p>\n<p>\u4e0d\u6562\u5431\u58f0\u7684\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc5mgA\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u597d\u50cf\u6d3e\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc5mgB\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u79bb\u8c31\u7684\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc5mgC\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u90a3\u4e48\uff0c\u6211\u4f5c\u4e3a\u4e00\u4e2a\u51fa\u624b\u4fa0\uff0c \u6211\u5fc5\u7136\u8981\u51fa\u624b\u4e86\u3002<\/p>\n<p>\u51fa\u624b\u4fa0\uff1a<\/p>\n<blockquote><p>\u4e60\u60ef\u7528\u8bed\uff0c\u7b49\u5230xxxxx\u7684\u65f6\u5019\uff0c\u6211\u5c31\u4f1a\u51fa\u624b\u3002<\/p><\/blockquote>\n<h2>\u6b63\u6587<\/h2>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc5mgy\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u8fd9\u4e2a\u5b8c\u6574\u7248\u53ef\u4ee5\u5173\u6ce8\u516c\u4f17\u53f7Java\u6838\u5fc3\u6280\u672f\uff0c\u7136\u540e\u5728\u516c\u4f17\u53f7\u540e\u53f0\u56de\u590d\u624b\u518c\u83b7\u53d6\u3002\u5176\u5b9e\u963f\u91cc\u5df4\u5df4\u624b\u518c\u4e0a\u8bf4\u660e\u7684\u4e09\u70b9\u4e86\uff1a<\/p>\n<h3>1\uff09 \u589e\u52a0\u67e5\u8be2\u5206\u6790\u5668\u89e3\u6790\u6210\u672c<\/h3>\n<p>\u4ec0\u4e48\u662f\u5206\u6790\u5668\u6210\u672c\uff0c\u4ec0\u4e48\u4e1c\u897f\uff0c\u6211\u968f\u624b\u753b\u4e2a\u7b80\u56fe\uff0c\u5927\u5bb6\u77e5\u9053\u4e00\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc5mgD\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u5c31\u662f\u8fd9\u4e2a\u5206\u6790\u5668\uff0c\u8fd9\u91cc\u4f1a\u53bb\u89e3\u6790\u4f60\u7684sql\u7684\u8bed\u6cd5\uff0c\u8bcd\u6cd5\u3002<\/p>\n<p>\u4e3e\u4f8b\uff0c\u5982\u679c\u662f<code>select * from user<\/code> \uff0c \u770b\u5230 * \uff0c\u5c31\u4f1a\u53bb\u770b\u770b\u662f\u54ea\u4e2a\u8868 user\uff0c\u7136\u540e <code>Query Table Metadata For Columns<\/code>\uff0c\u628a\u6240\u6709\u5217\u503c\u7ed9\u4f60\u652f\u695e\u51fa\u6765\uff0c\u586b\u5145\u6210\u7c7b\u4f3c  <code>select id \uff0cname \uff0cage\uff0cphone form user<\/code> \u8fd9\u6837\u5b50\u3002\uff08\u5f53\u7136\u8fd8\u6709\u5176\u4ed6\u5206\u6790\u4e86\uff0c\u4f8b\u5982\u5982\u8bed\u6cd5\u7684\u5224\u65ad\uff0c \u5b57\u6bb5\u7684\u5224\u65ad\uff0c \u8868\u540d\u7b49\u7b49\uff09<\/p>\n<p>\u8bf4\u5b9e\u8bdd\u3002\u8fd9\u4e2a\u5206\u6790\u5668\u7684\u6210\u672c&#8230;.\u4f60\u8981\u662f\u8bf4\u589e\u52a0\u4e86\u89e3\u6790\u6210\u672c\uff0c\u6211\u786e\u5b9e\u80fd\u7406\u89e3\u3002<\/p>\n<p>\u4f46\u662f\u6211\u611f\u89c9\u6210\u672c\u4e5f\u4e0d\u662f\u5f88\u5927&#8230;. \u9664\u975e\u662f\u4e2a\u5927\u8868\uff0c\u5927\u5230\u67e5\u8be2\u5b8c\u6240\u6709\u5217\u503c\uff1f<\/p>\n<p>so\uff0c\u6211\u80fd\u63a5\u53d7\uff0c\u4f46\u662f\u63a5\u53d7\u5f97\u4e0d\u591a\u3002<\/p>\n<h3>2\uff09 \u589e\u51cf\u5b57\u6bb5\uff0c\u5bb9\u6613\u4e0eresultMap \u914d\u7f6e\u4e0d\u4e00\u81f4<\/h3>\n<p>\u8fd9\u4e00\u70b9\u6211\u4e0d\u60f3\u8bf4\u3002\u8bf4\u5b9e\u5728\u7684\uff0c\u6709\u65f6\u5019\u5199<code>select *\uff08\u9700\u8981\u67e5\u8868\u6240\u6709\u5217\u503c\u7684\u65f6\u5019\uff09<\/code>\uff0c \u6211\u5b9e\u4f53\u52a0\u4e86\u5b57\u6bb5\uff0c\u6211\u6539\u4e86resultMap \uff0c\u6211sql\u8fd8\u4e0d\u7528\u52a8\u3002<\/p>\n<p>\u8fd9\u4e00\u70b9\u5c5e\u4e8e\u662f\u5e73\u65f6\u4f7f\u7528\u89c4\u8303\u4e0a\u7684\u89c4\u907f\u70b9\u4e86\uff0c\u4e0d\u591a\u8a00\u3002<\/p>\n<h3>3\uff09\u65e0\u7528\u5b57\u6bb5\u589e\u52a0\u7f51\u7edc\u6d88\u8017\u3001\u78c1\u76d8IO\u5f00\u9500<\/h3>\n<p>\u8fd9\u4e00\u70b9\u6709\u8bb2\u7a76\u3002<\/p>\n<p>\u53ef\u4ee5\u770b\u5230\u6211\u7b2c\u4e00\u70b9\u91cc\u9762\u753b\u7684\u7b80\u56fe\uff0c \u5982\u679c\u8bf4<\/p>\n<p>\u4e0d\u8003\u8651\u7f13\u5b58 \u5b58\u5728\u7684\u65f6\u5019\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc5mgE\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u6700\u7ec8\u4f1a\u8d70\u5230\u6267\u884c\u5668\uff0c\u7136\u540e\u6267\u884c\u5668\u540e\u9762\u5176\u5b9e\u662f\u5f15\u64ce\u5c42<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc5mgF\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u5f15\u64ce\u5c42\u8fd9\u91cc\u6211\u5c31\u4e0d\u5c55\u5f00\u4e86\uff0c\u5f15\u64ce\u5c42\u91cc\u9762\u5176\u5b9e\u5305\u62ec\u4e86\u5404\u79cd\u65e5\u5fd7\uff08undo\u3001redo\u3001binlog\u7b49\uff09\u7684\u8bb0\u5f55\uff0c\u8fd8\u6709\u5c31\u662f\u5728\u5185\u5b58\u91cc\u627e\u6570\u636e\u3002<\/p>\n<blockquote><p>\u7b80\u5355\u70b9\u5f52\u7eb3\uff0c\u5176\u5b9e\u8fd9\u79cd\u67e5\u8be2\u64cd\u4f5c\u5c31\u662f\u5237\u76d8\u64cd\u4f5c\uff0c\u4ece\u78c1\u76d8\u5237\u5165\u5185\u5b58\uff0c\u6d89\u53ca\u5230\u7684 \u78c1\u76d8IO\u5f00\u9500\u3002<\/p><\/blockquote>\n<p>\u90a3\u4e48\u5728\u5237\u76d8\u64cd\u4f5c\u7684\u65f6\u5019\uff0c\u662f\u4e0d\u662f\u771f\u7684<code>selec *<\/code> \u5c31\u771f\u7684\u4f1a \u589e\u52a0 \u78c1\u76d8IO\u5f00\u9500\u5462\uff1f<\/p>\n<p>\u7b54\u6848\uff0c\u80af\u5b9a\u662f\u7684\u3002\u4f46\u662f \u589e\u5927\u7684\u5f71\u54cd\u7a0b\u5ea6\uff0c\u6211\u5fc5\u987b\u8bf4\u4e00\u4e0b\uff1a<\/p>\n<blockquote><p>\u5982\u679c\u4f60\u8bf4 \uff0c\u8868\u91cc\u9762\u5c31\u4e09\u5b57\u6bb5 \uff0c id \uff0cname \uff0cage  \uff0c\u672c\u6765\u67e5 id \uff0cname \uff1b\u56e0\u4e3a select * \uff0c\u53d8\u6210\u67e5\u591a\u4e86\u4e00\u4e2a age \uff0c \u589e\u5927\u78c1\u76d8IO\u5f00\u9500 ?<\/p><\/blockquote>\n<p>\u6211\u89c9\u5f97\u662f\u589e\u5927\u4e86\uff0c\u4f46\u662f\u51e0\u4e4e\u4e0d\u7528\u7406\u3002\u56e0\u4e3a\u8fd9\u4e9b\u90fd\u662f\u6b63\u5e38\u7684\u6570\u636e\u7c7b\u578b\uff0c\u5f00\u9500\u589e\u5927\u4e0d\u4e86\u591a\u5c11\u3002<\/p>\n<h5>\u6240\u4ee5\uff0c\u771f\u6b63\u9690\u85cf\u7684\u96f7\u662f\u4ec0\u4e48\uff1f<\/h5>\n<p>\u6709\u5927\u5b57\u6bb5<\/p>\n<p>\u4f8b\u5982<\/p>\n<pre><code>tinytext\u3001text\u3001mediumtext\u3001longtext\n\ntinybob\u3001blob\u3001mediumblob\u3001longblob<\/code><\/pre>\n<p>\u8fd9\u4e9b\u5bb6\u4f19\uff0c\u5728mysql\u4e0a\uff0c\u5c31\u662f\u5f53\u505a\u4e00\u4e2a\u72ec\u7acb\u7684\u5bf9\u8c61\u5904\u7406\u3002<\/p>\n<p>\u8fd9\u65f6\u5019\u5c31\u771f\u7684\u8981\u8c28\u614e\u4e86\u3002<\/p>\n<p>\u5982\u679c\u4f60\u662f\u4e2a\u6bd4\u8f83\u591a\u5b57\u6bb5\u7684\u8868\uff0c\u4f8b\u5982\u4ec0\u4e48\u610f\u89c1\u53cd\u9988\u8868\uff0c\u7559\u8a00\u4e0d\u786e\u5b9a\u957f\u5ea6\uff0c\u7528\u4e86text \uff0c\u8fd8\u6709\u56de\u590d\u7559\u8a00\u5b57\u6bb5\u4e5f\u7528\u4e86text \uff1b<\/p>\n<p>\u53c8\u4f8b\u5982\u535a\u5ba2\u6587\u672c\u8868\uff0c\u4e3a\u4e86\u5b58content\uff0c\u7528\u4e86\u8fd9\u4e9b\u5927\u5b57\u6bb5\u3002<\/p>\n<p>\u672c\u6765\u60f3\u67e5\u8be2\u4e00\u4e0b \u610f\u89c1\u7684\u53cd\u9988\u4eba\u540d \uff0c\u6216\u8005\u662f \u67e5\u8be2\u535a\u5ba2\u7684\u6807\u9898\uff0c\u7ed3\u679c\u56e0\u4e3a\u61d2\u6216\u8005\u4e0d\u6ce8\u610f\uff0c\u5199\u4e86<code>select *.<\/code>, \u67e5\u8be2\u7684\u65f6\u5019\u5e26\u51fa\u6765\u8fd9\u4e9b \u5927\u5b57\u6bb5\u3002<\/p>\n<p>\u90a3\u4e48\u663e\u7136\uff0c\u8fd9\u65f6\u5019\u8bfb\u53d6\u7684\u5185\u5bb9\u6570\u636e\u5c31\u662f\u771f\u7684\u6bd4\u539f\u5148\u521d\u8877\u8981\u5927\u5f88\u591a\uff08\u6ca1\u51c6\u4e1a\u4e3b\u5c0f\u4e39\u6295\u8bc9\u4fdd\u5b89\uff0c\u610f\u89c1\u53cd\u9988\u7684\u7559\u8a00\u7ed9\u4f60\u5199\u4e86\u7bc7\u5c0f\u8bba\u6587\uff09\uff0c \u8fd9\u65f6\u5019\u56e0\u4e3a\u8bfb\u53d6\u7684\u5185\u5bb9\u591a\uff0c\u78c1\u76d8IO\u5f00\u9500\u591a\uff0c\u7136\u540e\u8fd4\u56de\u6570\u636e\u5305\u7ed9\u5ba2\u6237\u7aef\u91cf\u4e5f\u591a\uff0c \u8fd9\u6837 \u5c31\u771f\u7684\u662f\u6709\u5f71\u54cd\u4e86\u3002<\/p>\n<h3>4\uff09 \u8865\u5145\uff0c\u5176\u5b9e\u4e5f\u662f\u6211\u9996\u5f53\u5176\u51b2\u60f3\u8bf4\u7684\u4e00\u70b9<\/h3>\n<p>\u65e0\u6cd5\u4f7f\u7528\u7d22\u5f15\u8986\u76d6<\/p>\n<p>ps\uff1a\u4eca\u5929\u5b66\u4e60\u6210\u8bed\u4e86\u5417\uff1f\u4e0d\u8981\u4e71\u7528\u6210\u8bed\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc5mgG\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p><code>select *<\/code> \u57fa\u672c\u544a\u522b\u7d22\u5f15\u8986\u76d6\u4e86<\/p>\n<h5>\u4ec0\u4e48\u662f\u7d22\u5f15\u8986\u76d6\uff1f<\/h5>\n<p>\u4e3e\u4f8b \uff1a<\/p>\n<blockquote><p>\u7ed9name\u5b57\u6bb5 \u5efa\u7d22\u5f15\uff0c \u67e5\u8be2\u7684\u65f6\u5019\uff0c\u53ea\u7528\u5230\u4e86 \u7d22\u5f15\u7684\u5b57\u6bb5\uff0c\u8fd9\u5c31\u662f\u7d22\u5f15\u8986\u76d6 \u3002<\/p><\/blockquote>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc5mgH\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u4e5f\u5c31\u662f\u76f4\u63a5\u901a\u8fc7\u67e5\u8be2\u7d22\u5f15\uff0c\u62ff\u51fa\u6765\u7684\u6570\u636e\u5c31\u5df2\u7ecf\u6ee1\u8db3\u4e86\u67e5\u8be2\u8fd4\u56de\u7684\u5b57\u6bb5\u6570\u636e\u3002\u65e0\u9700\u989d\u5916\u5176\u4ed6\u67e5\u8be2\u64cd\u4f5c\u4e86\uff0c\u4e5f\u5c31\u662f\u7d22\u5f15\u8986\u76d6\u4e86\u3002\u8fd9\u6837\u80af\u5b9a\u5feb\u3002<\/p>\n<p>\u5982\u679c\u521d\u8877\u662f\u67e5 name\uff0c \u7ed3\u679c\u5199\u6210\u4e86 <code>select *<\/code> \uff0c \u53d8\u6210\u67e5\u591a\u4e86\u5176\u4ed6\u5b57\u6bb5\uff0c \u90a3\u5176\u4ed6\u5b57\u6bb5\u4e0d\u662f\u7d22\u5f15\uff0c\u80af\u5b9a\u65e0\u6cd5\u89e6\u53d1\u7d22\u5f15\u8986\u76d6\u4f7f\u7528\u573a\u666f\u4e86\uff0c\u4e5f\u5c31\u662f\u9700\u8981\u989d\u5916\u7684\u56de\u8868\u67e5\u8be2\u64cd\u4f5c\u4e86\uff0c\u90a3\u8fd9\u6837\u5c31\u6162\u4e86\u3002<\/p>\n<p>\u56de\u5f52\u6b63\u9898\uff0c\u56e0\u4e3a\u5199\u6210<code>select *<\/code> \uff0c\u53d8\u6210\u67e5\u591a\u4e86\u5176\u4ed6\u5b57\u6bb5\uff0c \u5176\u4ed6\u5b57\u6bb5\u4e0d\u662f\u7d22\u5f15\uff0c\u5bfc\u81f4\u56de\u8868\uff0c\u6162\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc5mgI\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<h5>\u95ee\u9898\u51fa\u5728\u54ea\u91cc\uff1f \u51fa\u5728\u5176\u4ed6\u5b57\u6bb5\u4e0d\u662f\u7d22\u5f15?<\/h5>\n<p>\u90a3\u4e48\u7ed9\u5176\u4ed6\u5b57\u6bb5\u90fd\u5efa\u7d22\u5f15\u5457\uff0c\u5b8c\u4e8b\u4e86\u5144\u5f1f\u4eec\u3002<\/p>\n<p>\u4f60\u4eec\u5343\u4e07\u4e0d\u8981\u8fd9\u4e48\u4e71\u641e\uff0c\u7d22\u5f15\u7684\u7ef4\u62a4\u6210\u672c\u4e00\u5b9a\u662f\u4e0d\u80fd\u5ffd\u89c6\u7684\u3002<\/p>\n<p>\u6d89\u53ca\u5230\u4fee\u6539\u65b0\u589e\u5220\u9664\u6570\u636e\u65f6\u7d22\u5f15\u7684\u7ef4\u62a4\u6210\u672c\uff0c\u7d22\u5f15\u9875\u7684\u5206\u88c2\u5408\u5e76\u7b49\u7b49\u3002\u7d22\u5f15\u4e5f\u662f\u9700\u8981\u5b58\u8d77\u6765\u7684\uff0c\u4e5f\u662f\u9700\u8981\u5360\u7528\u78c1\u76d8\u7a7a\u95f4\u7684\u3002\u800c\u4e14\u5982\u679cN\u4e2a\u5b57\u6bb5\u90fd\u662f\u7d22\u5f15\uff0c \u968f\u4fbf\u6539\u52a8\u4e00\u884c\u6570\u636e\uff0c\u9700\u8981\u7ef4\u62a4N\u4e2a\u7d22\u5f15\u3002<\/p>\n<p>\u4ec0\u4e48\u6982\u5ff5\uff0c\u5c31\u50cf\u54b1\u4eec\u5e73\u65f6\u5199word\u6587\u6863\uff0c\u641e\u4e86\u4e2a\u76ee\u5f55\uff0c\u7136\u540e\u5e95\u4e0b\u76842\u7ea7\u6807\u9898\uff0c3\u7ea7\u6807\u9898\uff0c\u6b63\u6587\u5565\u7684\uff0c\u4ec0\u4e48\u5206\u9875\u5565\u7684\uff0c\u4e71\u4e03\u516b\u7cdf\u64cd\u4f5c\u7684\u7f16\u8f91\uff0c\u90fd\u9700\u8981\u53bb\u5237\u65b0\u4e00\u4e0b\u76ee\u5f55\u3002<\/p>\n<h5>\u90a3\u4e48\u8fd9\u4e2a\u7d22\u5f15\u8986\u76d6\u5f71\u54cd\u771f\u7684\u975e\u5e38\u5927\u5417\uff1f<\/h5>\n<p>\u62ff\u51fa200W\u6570\u636e\u7684\u8868\uff0c\u5220\u9664\u5168\u90e8\u7d22\u5f15\uff0c\u7ed9 <code>platform_sn<\/code> \u5355\u72ec\u52a0\u7d22\u5f15 \uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc5mgJ\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u7136\u540e\u5148\u8bd5\u8bd5\u7d22\u5f15\u8986\u76d6\u7684\u67e5\u8be2\uff0c\u770b\u770b\u7528\u65f6\uff0c0.02\u79d2 \uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc5mgK\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc5mgL\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u63a5\u7740\u6362\u6210<code>select *<\/code> \uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc5mgM\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u5f53\u7136\u8fd9\u662f 200W \u6570\u636e\u7684\u573a\u666f\u4e0b\uff0c \u4e0d\u8fc7\u53ef\u4ee5\u770b\u51fa\uff0c\u65f6\u95f4\u5dee\u8ddd\u8fd8\u662f\u5f88\u660e\u663e\u3002<\/p>\n<p>0.02  \u5230 0.179 &#8230;.<\/p>\n<p>\u5982\u679c\u6211\u4eec\u518d\u52a0\u51e0\u4e2a\u5927\u5b57\u6bb5\uff1fText &#8230; \u90a3\u4f30\u8ba1\u5c31\u771f\u7684\u79bb\u8c31\u4e86 \u3002<\/p>\n<h2>\u5ba2\u89c2\u603b\u7ed3\uff1a<\/h2>\n<ol>\n<li>\u5982\u679c\u8868\u91cc\u6709\u5927\u5b57\u6bb5\uff0cTEXT \u3001BLOB\u7cfb\u5217\u7c7b\u578b\u5b57\u6bb5\uff0c \u4f7f\u7528 <code>SELECT *<\/code> \u9700\u8981\u6ce8\u610f<\/li>\n<li>\u5982\u679c\u672c\u6765\u53ea\u67e5\u8be2\u67d01\uff0c2\u4e2a\u6bd4\u8f83\u5e38\u7528\u7684\u5b57\u6bb5\u7684\uff0c\u53ef\u4ee5\u7ed9\u8fd9\u4e9b\u5b57\u6bb5\u5efa\u5355\u4e2a\u7d22\u5f15\u6216\u8005\u7ec4\u5408\u7d22\u5f15 \uff0c\u8fd9\u65f6\u5019\u67e5\u8be2\u5c31\u907f\u514d \u4f7f\u7528 <code>SELECT *<\/code>\uff0c\u5c3d\u91cf\u80fd\u89e6\u53d1\u7d22\u5f15\u8986\u76d6\u662f\u6700\u597d\u7684\u4e86<\/li>\n<li>\u5982\u679c\u8868\u5b57\u6bb5\u4e0d\u591a\uff0c\u4e5f\u6ca1\u5565\u7279\u6b8a\u5b57\u6bb5\u7c7b\u578b\uff0c \u800c\u4e14\u80af\u5b9a\u662f\u67e5\u591a\u5217\u7684\uff0c\u65e0\u6cd5\u89e6\u53d1\u7d22\u5f15\u8986\u76d6\u7684\u60c5\u51b5\u4e0b\uff0c<\/li>\n<\/ol>\n<p>\u6211\u89c9\u5f97 \u4f7f\u7528 <code>SELECT *<\/code> \u4e5f\u65e0\u59a8\uff0c\u6216\u8005\u5199\u4e2a<code>&lt;select cloum&gt; <\/code>\u91cc\u9762\u5217\u51fa\u6240\u6709\u5b57\u6bb5\uff0c\u8fd9\u6837copy\u4ee3\u7801\u4e5f\u65b9\u4fbf\uff08\u56e0\u4e3a\u4f1a\u5b58\u5728\u4e00\u79cd\u60c5\u51b5\u5c31\u662f\uff0c\u6570\u636e\u5e93\u91cc\u9762\u6709\u8fd9\u4e2a\u5b57\u6bb5\uff0c\u4f46\u662f\u4e0d\u80fd\u67e5\u51fa\u6765\uff0c\u8fd9\u79cd\u60c5\u51b5<code>select * <\/code>\u5c31\u662f\u4e0d\u5982\u5199\u6210<code>select &lt;select cloum&gt;<\/code>\u8fd9\u79cd\u65b9\u5f0f\u65b9\u4fbf\u4e86\uff0c\u53ea\u9700\u8981\u5728<code>&lt;select cloum&gt; <\/code>\u63d0\u9664\u67d0\u4e2a\u5b57\u6bb5\u5c31 \u53ef\u4ee5\uff09\u3002<\/p>\n<p><strong>\u8fd1\u671f\u70ed\u6587\u63a8\u8350\uff1a<\/strong><\/p>\n<p>1.<a href=\"https:\/\/link.segmentfault.com\/?enc=CukFRN3I4TN%2B71nGPzhyUA%3D%3D.RKZhseItMR1pl3papiFCPSHXcQOp7Ups%2FhWR7IMNGKM%3D\" rel=\"nofollow\">1,000+ \u9053 Java\u9762\u8bd5\u9898\u53ca\u7b54\u6848\u6574\u7406(2022\u6700\u65b0\u7248)<\/a><\/p>\n<p>2.<a href=\"https:\/\/link.segmentfault.com\/?enc=rsNOHdGiEhV06%2BYnQ6oWjQ%3D%3D.gZg68dMn%2B6j9P9yNbN%2F28urzwjBnQZB7n5IqxQZJSth1XQwCAq3sZ6EW5h5rkGe0uS8iC6%2B9dhNnxRpc5KtlnQ%3D%3D\" rel=\"nofollow\">\u52b2\u7206\uff01Java \u534f\u7a0b\u8981\u6765\u4e86\u3002\u3002\u3002<\/a><\/p>\n<p>3.<a href=\"https:\/\/link.segmentfault.com\/?enc=T8jgqJ%2FUwXY08xJgvhUnNg%3D%3D.3QTNmcaPIVZHXAVyWV%2F0LtxQ7MLcwvHTECK5aPqOcuNoNkKKr%2Fcop3BA26KA0snZ\" rel=\"nofollow\">Spring Boot 2.x \u6559\u7a0b\uff0c\u592a\u5168\u4e86\uff01<\/a><\/p>\n<p>4.<a href=\"https:\/\/link.segmentfault.com\/?enc=%2FwK8%2FPhtfZSQDBQ4JTJCZQ%3D%3D.Bs%2Bg7zY8GyOT%2FG1u%2BuuWyxcfluk5SfNFq3sonNPq4IqJ%2BCSNke1BQFy7ABovZfhh0FB1%2BUteIvEQxBDs0Vd8xQ%3D%3D\" rel=\"nofollow\">\u522b\u518d\u5199\u6ee1\u5c4f\u7684\u7206\u7206\u7206\u70b8\u7c7b\u4e86\uff0c\u8bd5\u8bd5\u88c5\u9970\u5668\u6a21\u5f0f\uff0c\u8fd9\u624d\u662f\u4f18\u96c5\u7684\u65b9\u5f0f\uff01\uff01<\/a><\/p>\n<p>5.<a href=\"https:\/\/link.segmentfault.com\/?enc=nGY25xNVNIU44g%2F2YXX5Qw%3D%3D.kXlvkVekCd7qbNfXQ%2BG90%2Buq2vZFPAIDmD0uspXhLCGMAhofvLheFahxLIxDgZANPqMBnKjgz5Mh4gktqBKS92gL%2BPvwAW7Rg5IbH4nsjqE%3D\" rel=\"nofollow\">\u300aJava\u5f00\u53d1\u624b\u518c\uff08\u5d69\u5c71\u7248\uff09\u300b\u6700\u65b0\u53d1\u5e03\uff0c\u901f\u901f\u4e0b\u8f7d\uff01<\/a><\/p>\n<p>\u89c9\u5f97\u4e0d\u9519\uff0c\u522b\u5fd8\u4e86\u968f\u624b\u70b9\u8d5e+\u8f6c\u53d1\u54e6\uff01<\/p>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000043183907\">https:\/\/segmentfault.com\/a\/1190000043183907<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4f5c\u8005\uff1a\u5c0f\u76ee\u6807\u9752\u5e74\/\u6765\u6e90\uff1ahttps:\/\/blog.csdn.net\/qq_3538&#8230; \u524d\u8a00 \u4e0d\u5efa\u8bae [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-10007026","post","type-post","status-publish","format-standard","hentry","category-share"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10007026","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10007026"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10007026\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10007026"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10007026"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10007026"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}