{"id":984,"date":"2021-05-28T19:28:52","date_gmt":"2021-05-28T11:28:52","guid":{"rendered":"http:\/\/refusea.com\/?p=984"},"modified":"2021-05-28T19:54:07","modified_gmt":"2021-05-28T11:54:07","slug":"mysql-%e5%a4%84%e7%90%86%e5%94%af%e4%b8%80%e9%94%ae%e9%87%8d%e5%a4%8d%e7%9a%84%e6%8a%80%e5%b7%a7","status":"publish","type":"post","link":"https:\/\/refusea.com\/?p=984","title":{"rendered":"mysql \u5904\u7406\u552f\u4e00\u952e\u51b2\u7a81\u7684\u6280\u5de7"},"content":{"rendered":"<h2>\u6982\u8ff0<\/h2>\n<p>\u63d2\u5165\u4e00\u6761\u8bb0\u5f55\u5230 mysql \u6570\u636e\u5e93\uff0c\u5982\u4f55\u5904\u7406\u53ef\u80fd\u7684\u552f\u4e00\u952e\u51b2\u7a81\u5462\uff1f<\/p>\n<p>\u4e00\u822c\u505a\u6cd5\u53ef\u80fd\u662f\u5148\u67e5\u8be2\u4e00\u4e0b\uff0c\u5982\u679c\u8bb0\u5f55\u4e0d\u5b58\u5728\uff0c\u5c31\u53ef\u4ee5\u653e\u5fc3\u63d2\u5165\uff0c\u5982\u679c\u8bb0\u5f55\u5b58\u5728\uff0c\u89c6\u60c5\u51b5\u653e\u5f03\u63d2\u5165\u6216\u8005\u662f\u8fdb\u884c\u66f4\u65b0<\/p>\n<p>\u4e0d\u8fc7\u5148\u67e5\u8be2\u4e00\u4e0b\u6709\u4e00\u70b9\u70b9\u9ebb\u70e6\uff0c\u8fd9\u4e2a\u6b65\u9aa4\u80fd\u7701\u7565\u5417\uff1f<\/p>\n<p>\u5b9e\u9645\u4e0a\u662f\u53ef\u4ee5\u7684\uff0c\u8fd8\u6709\u4e0d\u5c11\u7684\u65b9\u6cd5\uff0c\u6211\u4eec\u6765\u5b9e\u9a8c\u4e0b\uff0c\u770b\u770b\u4ed6\u4eec\u7684\u533a\u522b<\/p>\n<h2>\u51c6\u5907\u5de5\u4f5c<\/h2>\n<p>\u521b\u5efa\u4e00\u4e2a\u7b80\u5355\u7684\u8868 user \u6765\u505a\u5b9e\u9a8c\uff1auser \u8868\u6709\u4e2a\u81ea\u589e\u4e3b\u952e\uff0c\u5728 name \u5b57\u6bb5\u4e0a\u521b\u5efa\u4e86\u552f\u4e00\u952e<\/p>\n<pre><code class=\"language-sql\">create table user (\n id int auto_increment,\n name varchar(20),\n age int,\n primary key (id),\n unique key (name)\n);<\/code><\/pre>\n<p>\u518d\u63d2\u5165\u4e00\u6761\u8bb0\u5f55<\/p>\n<pre><code class=\"language-sql\">mysql&gt; insert into user (name, age) values (&#039;mike&#039;, 20);\nQuery OK, 1 row affected (0.01 sec)<\/code><\/pre>\n<p>\u6b64\u65f6\u67e5\u8be2\u4e00\u4e0b<\/p>\n<pre><code class=\"language-sql\">mysql&gt; select * from user;\n+----+------+------+\n| id | name | age  |\n+----+------+------+\n|  1 | mike |   20 |\n+----+------+------+\n1 row in set (0.00 sec)<\/code><\/pre>\n<p>\u63a5\u4e0b\u6765\u5c31\u53ef\u4ee5\u505a\u5b9e\u9a8c\u4e86<\/p>\n<h2>\u5173\u4e8e\u81ea\u589e id \u7684\u9884\u5907\u77e5\u8bc6<\/h2>\n<p>\u7531\u4e8e\u552f\u4e00\u952e\u51b2\u7a81\uff0c\u5bfc\u81f4\u63d2\u5165\u5931\u8d25\uff0c\u81ea\u589e id \u4e5f\u4f1a\u9012\u589e\uff0c\u9a8c\u8bc1\u5982\u4e0b<\/p>\n<pre><code class=\"language-sql\">mysql&gt; insert into user (name, age) values (&#039;mike&#039;, 20);\nERROR 1062 (23000): Duplicate entry &#039;mike&#039; for key &#039;name&#039;\nmysql&gt; insert into user (name, age) values (&#039;tom&#039;, 20);\nQuery OK, 1 row affected (0.01 sec)\n\nmysql&gt; select * from user;\n+----+------+------+\n| id | name | age  |\n+----+------+------+\n|  1 | mike |   20 |\n|  3 | tom  |   20 |\n+----+------+------+\n2 rows in set (0.00 sec)<\/code><\/pre>\n<p>\u53ef\u4ee5\u770b\u5230\u867d\u7136\u7b2c\u4e8c\u6b21\u63d2\u5165 <code>mike<\/code> \u51fa\u9519\uff0c\u4f46\u662f id \u8fd8\u662f\u9012\u589e\u4e86\uff0c\u6709\u4e86\u8fd9\u4e2a\u9884\u5907\u77e5\u8bc6\uff0c\u66f4\u5bb9\u6613\u7406\u89e3\u540e\u7eed\u7684\u4e00\u4e9b\u64cd\u4f5c<\/p>\n<h2>insert ignore<\/h2>\n<p>\u5728 <code>insert<\/code> \u8bed\u53e5\u91cc\u589e\u52a0 <code>ignore<\/code>\uff0c\u5c31\u53ef\u4ee5\u8fbe\u5230\u5ffd\u7565\u552f\u4e00\u952e\u51b2\u7a81\u7684\u6548\u679c\uff0c\u6b64\u65f6 mysql \u4e0d\u4f1a\u62a5\u9519\uff0c\u800c\u662f\u653e\u5f03\u6267\u884c\u63d2\u5165\u3002\u5982\u4e0b<\/p>\n<pre><code class=\"language-sql\">mysql&gt; insert ignore into user (name, age) values (&#039;mike&#039;, 18);\nQuery OK, 0 rows affected, 1 warning (0.01 sec)\n\nmysql&gt; select * from user;\n+----+------+------+\n| id | name | age  |\n+----+------+------+\n|  1 | mike |   20 |\n|  3 | tom  |   20 |\n+----+------+------+\n2 rows in set (0.00 sec)<\/code><\/pre>\n<p>\u867d\u7136\u6ca1\u6709\u5b9e\u9645\u63d2\u5165\u6570\u636e\uff0c\u4f46\u662f\u81ea\u589e id \u5df2\u7ecf\u9012\u589e\u4e86\u3002\u5982\u679c\u6211\u4eec\u518d\u63d2\u5165\u4e00\u6761\u8bb0\u5f55\uff0cid \u5e94\u8be5\u662f 5\u3002\u5982\u4e0b<\/p>\n<pre><code class=\"language-sql\">mysql&gt; insert ignore into user (name, age) values (&#039;jack&#039;, 20);\nQuery OK, 1 row affected (0.01 sec)\n\nmysql&gt; select * from user;\n+----+------+------+\n| id | name | age  |\n+----+------+------+\n|  1 | mike |   20 |\n|  3 | tom  |   20 |\n|  5 | jack |   20 |\n+----+------+------+\n3 rows in set (0.00 sec)<\/code><\/pre>\n<p>\u65b0\u63d2\u5165\u7684\u8bb0\u5f55 id \u662f 5<\/p>\n<h2>replace into<\/h2>\n<p>\u5728\u6ca1\u6709\u53d1\u751f\u552f\u4e00\u952e\u51b2\u7a81\u65f6\uff0c<code>replace into<\/code> \u7684\u6548\u679c\u548c <code>insert into<\/code> \u4e00\u6837\uff0c\u5982\u679c\u53d1\u751f\u4e86\u4e3b\u952e\u51b2\u7a81\uff0c\u4f1a\u5220\u9664\u6570\u636e\u5e93\u4e2d\u5df2\u5b58\u5728\u7684\u8bb0\u5f55\u5e76\u63d2\u5165\u65b0\u7684\u8bb0\u5f55\u3002\u5982\u4e0b<\/p>\n<pre><code class=\"language-sql\">mysql&gt; replace into user (name, age) values (&#039;mike&#039;, 16);\nQuery OK, 2 rows affected (0.01 sec)\n\nmysql&gt; select * from user;\n+----+------+------+\n| id | name | age  |\n+----+------+------+\n|  3 | tom  |   20 |\n|  5 | jack |   20 |\n|  6 | mike |   16 |\n+----+------+------+\n3 rows in set (0.00 sec)<\/code><\/pre>\n<p>\u6ce8\u610f\uff0c<code>replace into<\/code> \u8bed\u53e5\u5f71\u54cd\u4e86 <code>2<\/code> \u884c\u8bb0\u5f55\uff0c\u4e14\u8bb0\u5f55\u7684 <code>id<\/code> \u4ece <code>1<\/code> \u53d8\u6210\u4e86 <code>6<\/code>\uff0c\u8fd9\u8bf4\u660e\u8be5\u8bed\u53e5\u5148\u5220\u9664\u4e86 <code>id=1<\/code> \u7684\u8bb0\u5f55\uff0c\u5e76\u63d2\u5165\u4e86 <code>1<\/code> \u6761\u65b0\u8bb0\u5f55<\/p>\n<p>\u5982\u679c\u662f\u4ee5\u81ea\u589e id \u4e3a\u4e3b\u952e\uff0c\u5e76\u4e14\u5176\u4ed6\u8868\u4f7f\u7528\u4e86\u8be5 id \u8fdb\u884c\u5173\u8054\uff0c<code>replace into<\/code> \u8981\u614e\u7528\uff0c\u53ef\u80fd\u4f1a\u53d1\u751f\u56e0 id \u6539\u53d8\u5bfc\u81f4\u5176\u4ed6\u8868\u5173\u8054\u4e0d\u5230\u6b63\u786e\u8bb0\u5f55\u7684\u95ee\u9898<\/p>\n<h2>insert &#8230; on duplicate key update<\/h2>\n<p>\u63d2\u5165\u65f6\u5982\u679c\u53d1\u751f\u4e86\u552f\u4e00\u952e\u51b2\u7a81\u5219\u8fdb\u884c\u66f4\u65b0\u64cd\u4f5c\uff0c\u548c <code>replace into<\/code> \u7684\u533a\u522b\u662f\u8be5\u8bed\u53e5\u4e0d\u4f1a\u5148\u5220\u9664\u540e\u63d2\u5165\uff0c\u800c\u662f\u76f4\u63a5\u4fee\u6539\u539f\u59cb\u8bb0\u5f55\uff0c\u8fd9\u6837\u6d89\u53ca\u5230\u81ea\u589e id \u65f6\uff0c\u4e0d\u4f1a\u53d1\u751f id \u53d8\u5316\u7684\u60c5\u51b5\u3002\u5982\u4e0b<\/p>\n<pre><code class=\"language-sql\">mysql&gt;  insert into user (name, age) values (&#039;mike&#039;, 14) on duplicate key update age=14;\nQuery OK, 2 rows affected (0.01 sec)\n\nmysql&gt; select * from user;\n+----+------+------+\n| id | name | age  |\n+----+------+------+\n|  3 | tom  |   20 |\n|  5 | jack |   20 |\n|  6 | mike |   14 |\n+----+------+------+\n3 rows in set (0.00 sec)<\/code><\/pre>\n<p>\u53ef\u4ee5\u770b\u5230 age \u88ab\u4fee\u6539\u4e86\uff0c\u4f46\u662f id \u5e76\u6ca1\u6709\u6539\u53d8\uff0c\u8fd9\u8bf4\u660e\u5b9e\u9645\u6267\u884c\u7684\u662f <code>update<\/code> \u64cd\u4f5c<\/p>\n<p>\u6839\u636e mysql \u7684\u8f93\u51fa\uff0c\u53ef\u4ee5\u770b\u5230\u8be5\u8bed\u53e5\u5f71\u54cd\u4e86 2 \u884c\u8bb0\u5f55\uff0c\u8fd9\u662f\u4e3a\u4ec0\u4e48\u5462\uff1f\u5f88\u660e\u663e\u662f\u53d1\u751f\u4e86\u4e00\u6b21\u672a\u6210\u529f\u7684 <code>insert<\/code> \u540e\u624d\u6267\u884c\u7684 <code>update<\/code>\uff0c\u8be5 <code>insert<\/code> \u867d\u7136\u4e0d\u6210\u529f\uff0c\u4f46\u5b9e\u5b9e\u5728\u5728\u7684\u6539\u53d8\u4e86\u81ea\u589e id\uff0c\u6240\u4ee5\u5f71\u54cd\u7684\u884c\u6570\u662f 2<\/p>\n<p>\u6b64\u65f6\u63d2\u5165\u4e00\u6761\u8bb0\u5f55\uff0cid \u5e94\u8be5\u662f 8\uff0c\u9a8c\u8bc1\u4e00\u4e0b<\/p>\n<pre><code class=\"language-sql\">mysql&gt; insert into user (name, age) values (&#039;ken&#039;, 20);\nQuery OK, 1 row affected (0.00 sec)\n\nmysql&gt; select * from user;\n+----+------+------+\n| id | name | age  |\n+----+------+------+\n|  3 | tom  |   20 |\n|  5 | jack |   20 |\n|  6 | mike |   14 |\n|  8 | ken  |   20 |\n+----+------+------+\n4 rows in set (0.00 sec)<\/code><\/pre>\n<p>\u53e6\u5916\uff0c\u6839\u636e <a href=\"https:\/\/dev.mysql.com\/doc\/refman\/8.0\/en\/insert-on-duplicate.html\" title=\"mysql \u6587\u6863\">mysql \u6587\u6863<\/a>\uff0c\u8be5\u8bed\u53e5\u5f71\u54cd\u884c\u6570\u5982\u4e0b<\/p>\n<blockquote>\n<p>With ON DUPLICATE KEY UPDATE, the affected-rows value per row is 1 if the row is inserted as a new row, 2 if an existing row is updated, and 0 if an existing row is set to its current values.<\/p>\n<\/blockquote>\n<p>\u6839\u636e\u6587\u6863\u63cf\u8ff0\uff0c\u5982\u679c\u8981\u63d2\u5165\u7684\u6570\u636e\u548c\u5df2\u6709\u7684\u6570\u636e\u5b8c\u5168\u4e00\u81f4\uff0c\u5f71\u54cd\u7684\u884c\u6570\u5c06\u662f 0\uff0c\u9a8c\u8bc1\u4e00\u4e0b<\/p>\n<pre><code class=\"language-sql\">mysql&gt;  insert into user (name, age) values (&#039;mike&#039;, 14) on duplicate key update age=14;\nQuery OK, 0 rows affected (0.01 sec)<\/code><\/pre>\n<p>\u90a3\u4e48\u6b64\u65f6\u518d\u6210\u529f\u63d2\u5165\u4e00\u6761\u8bb0\u5f55\uff0cid \u5c06\u662f 9\uff0c\u9a8c\u8bc1\u4e00\u4e0b<\/p>\n<pre><code class=\"language-sql\">mysql&gt; insert into user (name, age) values (&#039;ivan&#039;, 20);\nQuery OK, 1 row affected (0.00 sec)\n\nmysql&gt; select * from user;\n+----+------+------+\n| id | name | age  |\n+----+------+------+\n|  3 | tom  |   20 |\n|  5 | jack |   20 |\n|  6 | mike |   14 |\n|  8 | ken  |   20 |\n| 10 | ivan |   20 |\n+----+------+------+\n5 rows in set (0.00 sec)<\/code><\/pre>\n<p>\u5b9e\u9645\u4e0a\uff0c\u65b0\u8bb0\u5f55\u7684 id \u662f 10\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u591a\u8bd5\u9a8c\u51e0\u6b21\uff0c\u867d\u7136\u5b98\u65b9\u6587\u6863\u91cc\u8bf4\u63d2\u5165\u76f8\u540c\u7684\u8bb0\u5f55\u5f71\u54cd\u884c\u6570\u662f 0\uff0c \u4f46\u662f\u5b9e\u9645\u4e0a\u4f9d\u7136\u5b58\u5728\u4e00\u6b21\u9690\u542b\u7684\u63d2\u5165\u5931\u8d25\uff0c\u5bfc\u81f4\u81ea\u589e id \u7684\u9012\u589e<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6982\u8ff0 \u63d2\u5165\u4e00\u6761\u8bb0\u5f55\u5230 mysql \u6570\u636e\u5e93\uff0c\u5982\u4f55\u5904\u7406\u53ef\u80fd\u7684\u552f\u4e00\u952e\u51b2\u7a81\u5462\uff1f \u4e00\u822c\u505a\u6cd5\u53ef\u80fd\u662f\u5148\u67e5\u8be2\u4e00\u4e0b\uff0c\u5982\u679c\u8bb0\u5f55\u4e0d\u5b58 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[8],"class_list":["post-984","post","type-post","status-publish","format-standard","hentry","category-26","tag-mysql"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>mysql \u5904\u7406\u552f\u4e00\u952e\u51b2\u7a81\u7684\u6280\u5de7 - \u62d2\u6d77\u7a7a\u95f4<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/refusea.com\/?p=984\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"refusea.com\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/refusea.com\/?p=984#article\",\"isPartOf\":{\"@id\":\"https:\/\/refusea.com\/?p=984\"},\"author\":{\"name\":\"refusea.com\",\"@id\":\"https:\/\/refusea.com\/#\/schema\/person\/b5393cc8b15717000d19424552aae0df\"},\"headline\":\"mysql \u5904\u7406\u552f\u4e00\u952e\u51b2\u7a81\u7684\u6280\u5de7\",\"datePublished\":\"2021-05-28T11:28:52+00:00\",\"dateModified\":\"2021-05-28T11:54:07+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/refusea.com\/?p=984\"},\"wordCount\":72,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/refusea.com\/#\/schema\/person\/b5393cc8b15717000d19424552aae0df\"},\"keywords\":[\"mysql\"],\"articleSection\":[\"\u5f00\u53d1\u6548\u7387\"],\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/refusea.com\/?p=984#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/refusea.com\/?p=984\",\"url\":\"https:\/\/refusea.com\/?p=984\",\"name\":\"mysql \u5904\u7406\u552f\u4e00\u952e\u51b2\u7a81\u7684\u6280\u5de7 - 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