{"id":1770,"date":"2025-02-18T00:22:27","date_gmt":"2025-02-17T16:22:27","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=1770"},"modified":"2025-02-18T00:22:27","modified_gmt":"2025-02-17T16:22:27","slug":"mysql-update-%e6%9b%b4%e6%96%b0%ef%bc%88%e9%99%84%e5%b8%a6%e5%ae%9e%e4%be%8b%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/02\/18\/mysql-update-%e6%9b%b4%e6%96%b0%ef%bc%88%e9%99%84%e5%b8%a6%e5%ae%9e%e4%be%8b%ef%bc%89\/","title":{"rendered":"MySQL UPDATE \u66f4\u65b0\uff08\u9644\u5e26\u5b9e\u4f8b\uff09"},"content":{"rendered":"\n<p>\u5728 MySQL \u4e2d\uff0c<code>UPDATE<\/code> \u8bed\u53e5\u7528\u4e8e\u4fee\u6539\u6570\u636e\u5e93\u8868\u4e2d\u7684\u73b0\u6709\u8bb0\u5f55\u3002\u4f60\u53ef\u4ee5\u901a\u8fc7 <code>UPDATE<\/code> \u8bed\u53e5\u4fee\u6539\u4e00\u4e2a\u6216\u591a\u4e2a\u5217\u7684\u503c\uff0c\u540c\u65f6\u53ef\u4ee5\u4f7f\u7528 <code>WHERE<\/code> \u5b50\u53e5\u6307\u5b9a\u4fee\u6539\u6761\u4ef6\uff0c\u786e\u4fdd\u53ea\u66f4\u65b0\u6ee1\u8db3\u6761\u4ef6\u7684\u8bb0\u5f55\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u662f <strong><code>UPDATE<\/code> \u8bed\u53e5\u7684\u8be6\u7ec6\u8bb2\u89e3<\/strong>\uff0c\u9644\u5e26\u5b9e\u7528\u7684\u5b9e\u4f8b\uff1a<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. <strong>\u57fa\u672c\u7684 <code>UPDATE<\/code> \u8bed\u6cd5<\/strong><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>\u57fa\u672c\u8bed\u6cd5<\/strong><\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>UPDATE table_name\nSET column1 = value1, column2 = value2, ...\nWHERE condition;<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>table_name<\/code>\uff1a\u4f60\u8981\u66f4\u65b0\u7684\u8868\u540d\u3002<\/li>\n\n\n\n<li><code>column1, column2, ...<\/code>\uff1a\u4f60\u8981\u66f4\u65b0\u7684\u5217\u3002<\/li>\n\n\n\n<li><code>value1, value2, ...<\/code>\uff1a\u65b0\u503c\uff0c\u66f4\u65b0\u540e\u7684\u503c\u3002<\/li>\n\n\n\n<li><code>WHERE condition<\/code>\uff1a\u8fc7\u6ee4\u6761\u4ef6\uff0c\u53ea\u6709\u6ee1\u8db3\u8be5\u6761\u4ef6\u7684\u8bb0\u5f55\u624d\u4f1a\u88ab\u66f4\u65b0\u3002\u5982\u679c\u6ca1\u6709 <code>WHERE<\/code> \u5b50\u53e5\uff0c\u8868\u4e2d\u7684\u6240\u6709\u8bb0\u5f55\u90fd\u4f1a\u88ab\u66f4\u65b0\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>\u5b9e\u4f8b\uff1a\u66f4\u65b0\u5355\u4e2a\u5b57\u6bb5<\/strong><\/h4>\n\n\n\n<p>\u5047\u8bbe\u6709\u4e00\u4e2a <code>users<\/code> \u8868\uff0c\u5305\u542b <code>user_id<\/code>, <code>username<\/code>, <code>email<\/code>, \u548c <code>age<\/code> \u5b57\u6bb5\u3002\u6211\u4eec\u8981\u66f4\u65b0 <code>user_id<\/code> \u4e3a 1 \u7684\u7528\u6237\u7684 <code>email<\/code>\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>UPDATE users\nSET email = 'newemail@example.com'\nWHERE user_id = 1;<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8fd9\u4e2a\u67e5\u8be2\u5c06\u66f4\u65b0 <code>user_id<\/code> \u4e3a 1 \u7684\u7528\u6237\u7684 <code>email<\/code> \u5b57\u6bb5\uff0c\u5c06\u5176\u8bbe\u7f6e\u4e3a <code>newemail@example.com<\/code>\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. <strong>\u66f4\u65b0\u591a\u4e2a\u5b57\u6bb5<\/strong><\/h3>\n\n\n\n<p>\u4f60\u53ef\u4ee5\u5728\u4e00\u4e2a <code>UPDATE<\/code> \u8bed\u53e5\u4e2d\u66f4\u65b0\u591a\u4e2a\u5217\u7684\u503c\u3002\u591a\u4e2a\u5217\u7684\u503c\u4e4b\u95f4\u4f7f\u7528\u9017\u53f7 <code>,<\/code> \u5206\u9694\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>\u5b9e\u4f8b\uff1a\u66f4\u65b0\u591a\u4e2a\u5b57\u6bb5<\/strong><\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>UPDATE users\nSET email = 'newemail@example.com', age = 30\nWHERE user_id = 1;<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8fd9\u4e2a\u67e5\u8be2\u5c06\u540c\u65f6\u66f4\u65b0 <code>user_id<\/code> \u4e3a 1 \u7684\u7528\u6237\u7684 <code>email<\/code> \u548c <code>age<\/code> \u5b57\u6bb5\uff0c\u5206\u522b\u8bbe\u7f6e\u4e3a <code>newemail@example.com<\/code> \u548c <code>30<\/code>\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. <strong>\u4f7f\u7528 <code>WHERE<\/code> \u5b50\u53e5\u9650\u5236\u66f4\u65b0\u8303\u56f4<\/strong><\/h3>\n\n\n\n<p><code>WHERE<\/code> \u5b50\u53e5\u7528\u4e8e\u9650\u5236\u66f4\u65b0\u64cd\u4f5c\u7684\u8303\u56f4\uff0c\u786e\u4fdd\u53ea\u6709\u6ee1\u8db3\u6761\u4ef6\u7684\u8bb0\u5f55\u88ab\u66f4\u65b0\u3002\u6ca1\u6709 <code>WHERE<\/code> \u5b50\u53e5\u65f6\uff0c\u6240\u6709\u8bb0\u5f55\u90fd\u5c06\u88ab\u66f4\u65b0\uff0c\u8fd9\u901a\u5e38\u4e0d\u662f\u6211\u4eec\u60f3\u8981\u7684\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>\u5b9e\u4f8b\uff1a\u4ec5\u66f4\u65b0\u7b26\u5408\u7279\u5b9a\u6761\u4ef6\u7684\u8bb0\u5f55<\/strong><\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>UPDATE users\nSET age = age + 1\nWHERE age &lt; 30;<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8fd9\u4e2a\u67e5\u8be2\u5c06\u589e\u52a0\u6240\u6709 <code>age<\/code> \u5c0f\u4e8e 30 \u7684\u7528\u6237\u7684 <code>age<\/code> \u5b57\u6bb5\u503c\u3002\u5176\u4ed6\u7528\u6237\u7684\u5e74\u9f84\u4e0d\u53d7\u5f71\u54cd\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>\u5b9e\u4f8b\uff1a\u66f4\u65b0\u7b26\u5408\u591a\u4e2a\u6761\u4ef6\u7684\u8bb0\u5f55<\/strong><\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>UPDATE users\nSET email = 'specialemail@example.com'\nWHERE user_id = 1 AND username = 'john_doe';<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8fd9\u4e2a\u67e5\u8be2\u5c06\u66f4\u65b0 <code>user_id<\/code> \u4e3a 1 \u4e14 <code>username<\/code> \u4e3a <code>'john_doe'<\/code> \u7684\u7528\u6237\u7684 <code>email<\/code> \u5b57\u6bb5\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">4. <strong>\u66f4\u65b0\u6240\u6709\u8bb0\u5f55<\/strong><\/h3>\n\n\n\n<p>\u5982\u679c\u4f60\u7701\u7565\u4e86 <code>WHERE<\/code> \u5b50\u53e5\uff0c<code>UPDATE<\/code> \u5c06\u4fee\u6539\u8868\u4e2d\u7684\u6240\u6709\u8bb0\u5f55\u3002<strong>\u8fd9\u79cd\u64cd\u4f5c\u975e\u5e38\u5371\u9669<\/strong>\uff0c\u901a\u5e38\u4e0d\u63a8\u8350\u5728\u6ca1\u6709\u5907\u4efd\u7684\u60c5\u51b5\u4e0b\u8fdb\u884c\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>\u5b9e\u4f8b\uff1a\u66f4\u65b0\u6240\u6709\u8bb0\u5f55<\/strong><\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>UPDATE users\nSET email = 'default@example.com';<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8fd9\u4e2a\u67e5\u8be2\u5c06\u628a <code>users<\/code> \u8868\u4e2d\u7684\u6240\u6709\u7528\u6237\u7684 <code>email<\/code> \u66f4\u65b0\u4e3a <code>'default@example.com'<\/code>\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">5. <strong>\u4f7f\u7528\u5b50\u67e5\u8be2\u66f4\u65b0\u6570\u636e<\/strong><\/h3>\n\n\n\n<p>\u4f60\u8fd8\u53ef\u4ee5\u4f7f\u7528\u5b50\u67e5\u8be2\u6765\u66f4\u65b0\u8868\u4e2d\u7684\u6570\u636e\u3002\u4f8b\u5982\uff0c\u4f60\u53ef\u4ee5\u6839\u636e\u53e6\u4e00\u5f20\u8868\u4e2d\u7684\u6570\u636e\u6765\u66f4\u65b0\u8bb0\u5f55\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>\u5b9e\u4f8b\uff1a\u4f7f\u7528\u5b50\u67e5\u8be2\u66f4\u65b0\u5b57\u6bb5<\/strong><\/h4>\n\n\n\n<p>\u5047\u8bbe\u4f60\u6709\u4e00\u4e2a <code>orders<\/code> \u8868\u548c\u4e00\u4e2a <code>users<\/code> \u8868\uff0c\u5e76\u4e14\u4f60\u8981\u6839\u636e <code>orders<\/code> \u8868\u4e2d\u6bcf\u4e2a\u7528\u6237\u7684\u8ba2\u5355\u603b\u6570\u6765\u66f4\u65b0 <code>users<\/code> \u8868\u4e2d\u7684 <code>total_spent<\/code> \u5b57\u6bb5\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>UPDATE users\nSET total_spent = (SELECT SUM(order_total) FROM orders WHERE orders.user_id = users.user_id)\nWHERE user_id = 1;<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8fd9\u4e2a\u67e5\u8be2\u6839\u636e <code>orders<\/code> \u8868\u4e2d <code>user_id<\/code> \u4e3a 1 \u7684\u7528\u6237\u7684\u6240\u6709\u8ba2\u5355\u603b\u548c\u6765\u66f4\u65b0 <code>users<\/code> \u8868\u4e2d\u8be5\u7528\u6237\u7684 <code>total_spent<\/code> \u5b57\u6bb5\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">6. <strong>\u66f4\u65b0\u65f6\u4f7f\u7528 <code>CASE<\/code> \u8bed\u53e5\u5b9e\u73b0\u6761\u4ef6\u66f4\u65b0<\/strong><\/h3>\n\n\n\n<p><code>CASE<\/code> \u8bed\u53e5\u5141\u8bb8\u4f60\u5728 <code>UPDATE<\/code> \u8bed\u53e5\u4e2d\u6839\u636e\u4e0d\u540c\u7684\u6761\u4ef6\u8bbe\u7f6e\u4e0d\u540c\u7684\u503c\uff0c\u7c7b\u4f3c\u4e8e\u5728 SQL \u4e2d\u4f7f\u7528 <code>if-else<\/code> \u903b\u8f91\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>\u5b9e\u4f8b\uff1a\u6839\u636e\u6761\u4ef6\u66f4\u65b0\u5b57\u6bb5<\/strong><\/h4>\n\n\n\n<p>\u5047\u8bbe\u4f60\u8981\u6839\u636e\u7528\u6237\u7684 <code>age<\/code> \u66f4\u65b0\u4e0d\u540c\u7684 <code>membership<\/code> \u7b49\u7ea7\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>UPDATE users\nSET membership = CASE\n                    WHEN age &lt; 18 THEN 'Junior'\n                    WHEN age BETWEEN 18 AND 60 THEN 'Adult'\n                    ELSE 'Senior'\n                 END;<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8fd9\u4e2a\u67e5\u8be2\u5c06\u6839\u636e\u6bcf\u4e2a\u7528\u6237\u7684 <code>age<\/code> \u66f4\u65b0\u4ed6\u4eec\u7684 <code>membership<\/code> \u5b57\u6bb5\uff0c18 \u5c81\u4ee5\u4e0b\u4e3a <code>'Junior'<\/code>\uff0c18 \u5230 60 \u5c81\u4e3a <code>'Adult'<\/code>\uff0c60 \u5c81\u4ee5\u4e0a\u4e3a <code>'Senior'<\/code>\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">7. <strong>\u4f7f\u7528 <code>LIMIT<\/code> \u9650\u5236\u66f4\u65b0\u7684\u8bb0\u5f55\u6570\u91cf<\/strong><\/h3>\n\n\n\n<p><code>LIMIT<\/code> \u5b50\u53e5\u53ef\u4ee5\u5728\u66f4\u65b0\u64cd\u4f5c\u4e2d\u9650\u5236\u66f4\u65b0\u7684\u8bb0\u5f55\u6570\u91cf\u3002\u5b83\u901a\u5e38\u4e0e <code>ORDER BY<\/code> \u5b50\u53e5\u4e00\u8d77\u4f7f\u7528\uff0c\u5148\u6309\u6307\u5b9a\u89c4\u5219\u6392\u5e8f\uff0c\u7136\u540e\u9650\u5236\u66f4\u65b0\u7684\u8bb0\u5f55\u6570\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>\u5b9e\u4f8b\uff1a\u66f4\u65b0\u9650\u5b9a\u6570\u91cf\u7684\u8bb0\u5f55<\/strong><\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>UPDATE users\nSET age = age + 1\nWHERE age &lt; 30\nORDER BY age DESC\nLIMIT 5;<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8fd9\u4e2a\u67e5\u8be2\u5c06\u5bf9 <code>age<\/code> \u5c0f\u4e8e 30 \u7684\u7528\u6237\u6309 <code>age<\/code> \u964d\u5e8f\u6392\u5217\uff0c\u7136\u540e\u4ec5\u66f4\u65b0\u524d 5 \u6761\u8bb0\u5f55\uff0c\u5c06\u5b83\u4eec\u7684 <code>age<\/code> \u589e\u52a0 1\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">8. <strong>\u66f4\u65b0\u65f6\u907f\u514d SQL \u6ce8\u5165<\/strong><\/h3>\n\n\n\n<p>\u5982\u679c\u901a\u8fc7 Web \u8868\u5355\u6216\u5176\u4ed6\u8f93\u5165\u66f4\u65b0\u6570\u636e\uff0c\u786e\u4fdd\u4f7f\u7528\u53c2\u6570\u5316\u67e5\u8be2\uff08\u800c\u4e0d\u662f\u76f4\u63a5\u62fc\u63a5 SQL \u5b57\u7b26\u4e32\uff09\uff0c\u4ee5\u9632\u6b62 SQL \u6ce8\u5165\u653b\u51fb\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>\u5b9e\u4f8b\uff1aPHP \u4e2d\u4f7f\u7528\u53c2\u6570\u5316\u67e5\u8be2<\/strong><\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>$stmt = $mysqli-&gt;prepare(\"UPDATE users SET email = ? WHERE user_id = ?\");\n$stmt-&gt;bind_param(\"si\", $email, $user_id);\n$email = 'newemail@example.com';\n$user_id = 1;\n$stmt-&gt;execute();<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8fd9\u4e2a PHP \u793a\u4f8b\u4f7f\u7528\u4e86\u9884\u5904\u7406\u8bed\u53e5\u548c\u53c2\u6570\u7ed1\u5b9a\uff0c\u4ece\u800c\u907f\u514d\u4e86 SQL \u6ce8\u5165\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">9. <strong>\u4e8b\u52a1\u63a7\u5236\uff08\u53ef\u9009\uff09<\/strong><\/h3>\n\n\n\n<p>\u5bf9\u4e8e\u5173\u952e\u66f4\u65b0\u64cd\u4f5c\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528\u4e8b\u52a1\u6765\u786e\u4fdd\u66f4\u65b0\u64cd\u4f5c\u7684\u539f\u5b50\u6027\u3002\u5982\u679c\u64cd\u4f5c\u5931\u8d25\uff0c\u4e8b\u52a1\u53ef\u4ee5\u56de\u6eda\u5230\u66f4\u65b0\u524d\u7684\u72b6\u6001\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>\u5b9e\u4f8b\uff1a\u4f7f\u7528\u4e8b\u52a1\u8fdb\u884c\u66f4\u65b0<\/strong><\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>START TRANSACTION;\n\nUPDATE users\nSET email = 'newemail@example.com'\nWHERE user_id = 1;\n\nUPDATE users\nSET age = 30\nWHERE user_id = 2;\n\nCOMMIT;<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8fd9\u4e2a\u67e5\u8be2\u4f7f\u7528\u4e86\u4e8b\u52a1\uff0c\u786e\u4fdd\u53ea\u6709\u5728\u6240\u6709 <code>UPDATE<\/code> \u64cd\u4f5c\u90fd\u6210\u529f\u540e\uff0c\u4fee\u6539\u624d\u4f1a\u751f\u6548\u3002\u5982\u679c\u5176\u4e2d\u4e00\u4e2a <code>UPDATE<\/code> \u5931\u8d25\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>ROLLBACK<\/code> \u6765\u56de\u6eda\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">10. <strong>\u6ce8\u610f\u4e8b\u9879<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u8c28\u614e\u4f7f\u7528 <code>UPDATE<\/code><\/strong>\uff1a\u5728\u6267\u884c <code>UPDATE<\/code> \u8bed\u53e5\u4e4b\u524d\uff0c\u6700\u597d\u5148\u6267\u884c <code>SELECT<\/code> \u67e5\u8be2\u786e\u8ba4\u6761\u4ef6\u662f\u5426\u6b63\u786e\uff0c\u4ee5\u907f\u514d\u4e0d\u5c0f\u5fc3\u66f4\u65b0\u4e86\u9519\u8bef\u7684\u8bb0\u5f55\u3002<\/li>\n\n\n\n<li><strong>\u5b9a\u671f\u5907\u4efd\u6570\u636e<\/strong>\uff1a\u5728\u8fdb\u884c\u6279\u91cf\u66f4\u65b0\u64cd\u4f5c\u65f6\uff0c\u786e\u4fdd\u6709\u5907\u4efd\uff0c\u4ee5\u9632\u6b62\u6570\u636e\u4e22\u5931\u6216\u9519\u8bef\u4fee\u6539\u3002<\/li>\n\n\n\n<li><strong>\u4f7f\u7528\u4e8b\u52a1<\/strong>\uff1a\u5bf9\u4e8e\u5173\u952e\u64cd\u4f5c\uff0c\u4f7f\u7528\u4e8b\u52a1\u6765\u4fdd\u8bc1\u6570\u636e\u4e00\u81f4\u6027\u548c\u53ef\u9760\u6027\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">\u603b\u7ed3<\/h3>\n\n\n\n<p><code>UPDATE<\/code> \u662f MySQL \u4e2d\u975e\u5e38\u91cd\u8981\u7684\u64cd\u4f5c\uff0c\u5b83\u5141\u8bb8\u4f60\u4fee\u6539\u8868\u4e2d\u7684\u6570\u636e\u3002\u5e38\u89c1\u7684\u64cd\u4f5c\u5305\u62ec\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u4f7f\u7528 <code>SET<\/code> \u66f4\u65b0\u5b57\u6bb5\u3002<\/li>\n\n\n\n<li>\u4f7f\u7528 <code>WHERE<\/code> \u9650\u5236\u66f4\u65b0\u7684\u8bb0\u5f55\u3002<\/li>\n\n\n\n<li>\u4f7f\u7528\u5b50\u67e5\u8be2\u66f4\u65b0\u6570\u636e\u3002<\/li>\n\n\n\n<li>\u4f7f\u7528 <code>CASE<\/code> \u8bed\u53e5\u8fdb\u884c\u6761\u4ef6\u66f4\u65b0\u3002<\/li>\n\n\n\n<li>\u4f7f\u7528 <code>LIMIT<\/code> \u9650\u5236\u66f4\u65b0\u7684\u8bb0\u5f55\u6570\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u5728\u6267\u884c <code>UPDATE<\/code> \u65f6\uff0c\u52a1\u5fc5\u5c0f\u5fc3\uff0c\u907f\u514d\u4e0d\u5c0f\u5fc3\u4fee\u6539\u5927\u91cf\u6570\u636e\uff0c\u4f7f\u7528 <code>WHERE<\/code> \u5b50\u53e5\u3001\u4e8b\u52a1\u7b49\u6765\u786e\u4fdd\u64cd\u4f5c\u7684\u5b89\u5168\u6027\u548c\u53ef\u9760\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 MySQL \u4e2d\uff0cUPDATE \u8bed\u53e5\u7528\u4e8e\u4fee\u6539\u6570\u636e\u5e93\u8868\u4e2d\u7684\u73b0\u6709\u8bb0\u5f55\u3002\u4f60\u53ef\u4ee5\u901a\u8fc7 UPDATE \u8bed\u53e5\u4fee\u6539\u4e00\u4e2a\u6216\u591a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[],"class_list":["post-1770","post","type-post","status-publish","format-standard","hentry","category-mysql"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/1770","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=1770"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/1770\/revisions"}],"predecessor-version":[{"id":1771,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/1770\/revisions\/1771"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=1770"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=1770"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=1770"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}