{"id":301,"date":"2022-06-13T13:58:14","date_gmt":"2022-06-13T05:58:14","guid":{"rendered":"https:\/\/frogvps.com\/?p=301"},"modified":"2022-06-13T13:58:15","modified_gmt":"2022-06-13T05:58:15","slug":"mysql-dml%e8%af%ad%e5%8f%a5","status":"publish","type":"post","link":"https:\/\/frogvps.com\/?p=301","title":{"rendered":"MYSQL DML\u8bed\u53e5"},"content":{"rendered":"\n<p>DML \u8bed\u53e5<\/p>\n\n\n\n<p>DML\u8bed\u53e5\u5305\u62ec\uff1aINSERT, UPDATE,DELETE<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">INSERT \u8bed\u53e5<\/h2>\n\n\n\n<p>\u8bed\u6cd5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>INSERT tbl_name &#91;(col1,...)] VALUES (val1,...), (val2,...)<\/code><\/pre>\n\n\n\n<p>\u5168\u503c\u63d2\u5165\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>insert stu values(null,\"haha\",6,default,3,1);<\/code><\/pre>\n\n\n\n<p>\u90e8\u5206\u5217\u63d2\u5165\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>insert stu(name,age,classid) values(\"hehe\",5,2);<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">UPDATE \u8bed\u53e5<\/h2>\n\n\n\n<p>\u8bed\u6cd5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>UPDATE &#91;LOW_PRIORITY] &#91;IGNORE] table_reference\nSET col_name1={expr1|DEFAULT} &#91;, col_name2={expr2|DEFAULT}] ...\n&#91;WHERE where_condition]\n&#91;ORDER BY ...]\n&#91;LIMIT row_count]<\/code><\/pre>\n\n\n\n<p>\u4fee\u6539\u8868\u7684\u67d0\u4e00\u884c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>UPDATE stu SET name='bendan' where id=27;\n#\u6ce8\u610f\uff1a\u4e00\u5b9a\u8981\u6709\u9650\u5236\u6761\u4ef6\uff0c\u5426\u5219\u5c06\u4fee\u6539\u8868\u4e2d\u6240\u6709\u884c\u7684\u6307\u5b9a\u5b57\u6bb5<\/code><\/pre>\n\n\n\n<p>\u53ef\u5229\u7528mysql \u9009\u9879\u907f\u514d\u6b64\u9519\u8bef\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&#91;mysql]\nsafe-updates<\/code><\/pre>\n\n\n\n<p>\u4fee\u6539\u5b8c\u914d\u7f6e\u6587\u4ef6\u540e\u91cd\u542f\u670d\u52a1\uff0c\u9700\u8981\u91cd\u65b0\u767b\u5f55MYSQL\u751f\u6548\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>mysql&gt; show variables like \"sql_safe%\";\n+------------------+-------+\n| Variable_name    | Value |\n+------------------+-------+\n| sql_safe_updates | ON    |\n+------------------+-------+<\/code><\/pre>\n\n\n\n<p>\u8fd9\u65f6\u5019\u518d\u4f7f\u7528UPDATE\u8bed\u53e5\u65f6\u4e0d\u52a0WHERE\u6761\u4ef6\u4f1a\u663e\u793a\u5982\u4e0b\u62a5\u9519\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ERROR 1175 (HY000): You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column. <\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">DELETE \u8bed\u53e5<\/h2>\n\n\n\n<p>\u5220\u9664\u8868\u4e2d\u6570\u636e\uff0c\u4f46\u4e0d\u4f1a\u81ea\u52a8\u7f29\u51cf\u6570\u636e\u6587\u4ef6\u7684\u5927\u5c0f<\/p>\n\n\n\n<p>\u8bed\u6cd5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>DELETE &#91;LOW_PRIORITY] &#91;QUICK] &#91;IGNORE] FROM tbl_name\n&#91;WHERE where_condition]\n&#91;ORDER BY ...]\n&#91;LIMIT row_count]\n#\u53ef\u5148\u6392\u5e8f\u518d\u6307\u5b9a\u5220\u9664\u7684\u884c\u6570<\/code><\/pre>\n\n\n\n<p>\u5982\u679c\u60f3\u6e05\u7a7a\u8868\uff0c\u4fdd\u7559\u8868\u7ed3\u6784\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u4e0b\u9762\u8bed\u53e5\uff0c\u6b64\u8bed\u53e5\u4f1a\u81ea\u52a8\u7f29\u51cf\u6570\u636e\u6587\u4ef6\u7684\u5927\u5c0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>TRUNCATE TABLE tbl_name;<\/code><\/pre>\n\n\n\n<p>\u7f29\u51cf\u8868\u5927\u5c0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>OPTIMIZE TABLE tb_name;<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>DML \u8bed\u53e5 DML\u8bed\u53e5\u5305\u62ec\uff1aINSERT, UPDATE,DELETE INSERT \u8bed\u53e5 \u8bed\u6cd5\uff1a \u5168\u503c\u63d2\u5165\uff1a \u90e8\u5206\u5217\u63d2\u5165\uff1a UPDATE \u8bed\u53e5 \u8bed\u6cd5\uff1a \u4fee\u6539\u8868\u7684\u67d0\u4e00\u884c\uff1a \u53ef\u5229\u7528mysql \u9009\u9879\u907f\u514d\u6b64\u9519\u8bef\uff1a \u4fee\u6539\u5b8c\u914d\u7f6e\u6587\u4ef6\u540e\u91cd\u542f\u670d\u52a1\uff0c\u9700\u8981&#8230;<\/p>\n","protected":false},"author":1,"featured_media":283,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[36],"topic":[],"class_list":["post-301","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-35","tag-mysql"],"_links":{"self":[{"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/posts\/301","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/frogvps.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=301"}],"version-history":[{"count":1,"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/posts\/301\/revisions"}],"predecessor-version":[{"id":302,"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/posts\/301\/revisions\/302"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/frogvps.com\/index.php?rest_route=\/wp\/v2\/media\/283"}],"wp:attachment":[{"href":"https:\/\/frogvps.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=301"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/frogvps.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=301"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/frogvps.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=301"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/frogvps.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftopic&post=301"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}