{"id":4897,"date":"2022-03-28T18:49:06","date_gmt":"2022-03-28T10:49:06","guid":{"rendered":"https:\/\/egonlin.com\/?p=4897"},"modified":"2023-12-28T17:50:22","modified_gmt":"2023-12-28T09:50:22","slug":"%e7%ac%ac%e4%ba%8c%e8%8a%82%ef%bc%9a%e5%ba%93%e7%9b%b8%e5%85%b3","status":"publish","type":"post","link":"https:\/\/egonlin.com\/?p=4897","title":{"rendered":"\u7b2c\u4e8c\u8282\uff1a\u5e93\u76f8\u5173"},"content":{"rendered":"

\u5e93\u76f8\u5173\u64cd\u4f5c<\/h1>\n

\"\"<\/div><\/p>\n

\u4e00\u3001\u7cfb\u7edf\u6570\u636e\u5e93<\/h2>\n

information_schema\uff1a \u865a\u62df\u5e93\uff0c\u4e0d\u5360\u7528\u78c1\u76d8\u7a7a\u95f4\uff0c\u5b58\u50a8\u7684\u662f\u6570\u636e\u5e93\u542f\u52a8\u540e\u7684\u4e00\u4e9b\u53c2\u6570\uff0c\u5982\u7528\u6237\u8868\u4fe1\u606f\u3001\u5217\u4fe1\u606f\u3001\u6743\u9650\u4fe1\u606f\u3001\u5b57\u7b26\u4fe1\u606f\u7b49 performance_schema\uff1a MySQL 5.5\u5f00\u59cb\u65b0\u589e\u4e00\u4e2a\u6570\u636e\u5e93\uff1a\u4e3b\u8981\u7528\u4e8e\u6536\u96c6\u6570\u636e\u5e93\u670d\u52a1\u5668\u6027\u80fd\u53c2\u6570\uff0c\u8bb0\u5f55\u5904\u7406\u67e5\u8be2\u8bf7\u6c42\u65f6\u53d1\u751f\u7684\u5404\u79cd\u4e8b\u4ef6\u3001\u9501\u7b49\u73b0\u8c61 mysql\uff1a \u6388\u6743\u5e93\uff0c\u4e3b\u8981\u5b58\u50a8\u7cfb\u7edf\u7528\u6237\u7684\u6743\u9650\u4fe1\u606f test\uff1a MySQL\u6570\u636e\u5e93\u7cfb\u7edf\u81ea\u52a8\u521b\u5efa\u7684\u6d4b\u8bd5\u6570\u636e\u5e93
\nmysql\uff1a \u6388\u6743\u5e93\uff0c\u4e3b\u8981\u5b58\u50a8\u7cfb\u7edf\u7528\u6237\u7684\u6743\u9650\u4fe1\u606f
\ntest\uff1a MySQL\u6570\u636e\u5e93\u7cfb\u7edf\u81ea\u52a8\u521b\u5efa\u7684\u6d4b\u8bd5\u6570\u636e\u5e93
\ninformation_schema\u5e93\u4e0b\u7684\u8868<\/p>\n

1\u3001TABLES\u8868\uff1a\u63d0\u4f9b\u4e86\u5173\u4e8e\u6570\u636e\u5e93\u4e2d\u7684\u8868\u7684\u4fe1\u606f\nmysql> use information_schema\nmysql> select * from tables limit 1\\G\nmysql> select * from tables where TABLE_NAME='city'\\G\n\ncolumns\u8868\uff1a\u63d0\u4f9b\u4e86\u5173\u4e8e\u6570\u636e\u5e93\u4e2d\u8868\u7684\u5217\u7684\u4fe1\u606f\nmysql> select * from columns\\G\n\nSTATISTICS\u8868\uff1a\u8868\u7d22\u5f15\u7684\u4fe1\u606f\n\nCOLLATIONS\u8868\uff1a\u63d0\u4f9b\u6821\u9a8c\u89c4\u5219\u548c\u5b57\u7b26\u96c6\u5bf9\u5e94\u5173\u7cfb\n\nTable_catalog    \u6570\u636e\u8868\u767b\u8bb0\u76ee\u5f55\nTable_schema    \u6570\u636e\u8868\u6240\u5c5e\u7684\u6570\u636e\u5e93\u540d\nTable_name    \u8868\u540d\u79f0\nTable_type    \u8868\u7c7b\u578b[system view|base table] \u7cfb\u7edf\u8868 \uff0c\u6570\u636e\u8868\nEngine    \u4f7f\u7528\u7684\u6570\u636e\u5e93\u5f15\u64ce[MyISAM|CSV|InnoDB]\nVersion    \u7248\u672c\uff0c\u9ed8\u8ba4\u503c10\nRow_format    \u884c\u683c\u5f0f[Compact|Dynamic|Fixed]\nTable_rows    \u8868\u91cc\u6240\u5b58\u591a\u5c11\u884c\u6570\u636e\nAvg_row_length    \u5e73\u5747\u884c\u957f\u5ea6\nData_length    \u6570\u636e\u957f\u5ea6\nMax_data_length    \u6700\u5927\u6570\u636e\u957f\u5ea6\nIndex_length    \u7d22\u5f15\u957f\u5ea6\nData_free    \u7a7a\u95f4\u788e\u7247  \u521a\u521a\u7528\u8fc7\u7684\u6682\u65f6\u4e0d\u518d\u4f7f\u7528\nAuto_increment    \u505a\u81ea\u589e\u4e3b\u952e\u7684\u81ea\u52a8\u589e\u91cf\u5f53\u524d\u503c  \u53ef\u4ee5\u901a\u8fc7\u5bfc\u51fa\u518d\u5bfc\u5165\u6570\u636e\u8fdb\u884c\u91ca\u653e\nCreate_time    \u8868\u7684\u521b\u5efa\u65f6\u95f4\nUpdate_time    \u8868\u7684\u66f4\u65b0\u65f6\u95f4\nCheck_time    \u8868\u7684\u68c0\u67e5\u65f6\u95f4\nTable_collation    \u8868\u7684\u5b57\u7b26\u6821\u9a8c\u7f16\u7801\u96c6\nChecksum    \u6821\u9a8c\u548c\nCreate_options    \u521b\u5efa\u9009\u9879\nTable_comment    \u8868\u7684\u6ce8\u91ca\u3001\u5907\u6ce8\n\nCREATE TABLE student(gid int primary key COMMENT '\u5217\u6ce8\u91ca') COMMENT='\u8868\u6ce8\u91ca';<\/code><\/pre>\n
\u4e8c\u3001\u521b\u5efa\u6570\u636e\u5e93<\/h2>\n
1\u3001\u8bed\u6cd5(help create database)<\/h3>\n
CREATE DATABASE \u6570\u636e\u5e93\u540d charset utf8;<\/code><\/pre>\n
2\u3001\u6570\u636e\u5e93\u547d\u540d\u89c4\u5219<\/h3>\n
\u53ef\u4ee5\u7531\u5b57\u6bcd\u3001\u6570\u5b57\u3001\u4e0b\u5212\u7ebf\u3001\uff20\u3001\uff03\u3001\uff04
\n\u533a\u5206\u5927\u5c0f\u5199
\n\u552f\u4e00\u6027
\n\u4e0d\u80fd\u4f7f\u7528\u5173\u952e\u5b57\u5982 create select
\n\u4e0d\u80fd\u5355\u72ec\u4f7f\u7528\u6570\u5b57
\n\u6700\u957f128\u4f4d<\/p>\n
\u4e09\u3001\u6570\u636e\u5e93\u76f8\u5173\u64cd\u4f5c<\/h2>\n
1 \u67e5\u770b\u6570\u636e\u5e93\nshow databases;\nshow create database db1;\nselect database();\n\n2 \u9009\u62e9\u6570\u636e\u5e93\nUSE \u6570\u636e\u5e93\u540d\n\n3 \u5220\u9664\u6570\u636e\u5e93\nDROP DATABASE \u6570\u636e\u5e93\u540d;\n\n4 \u4fee\u6539\u6570\u636e\u5e93\nalter database db1 charset utf8;<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u5e93\u76f8\u5173\u64cd\u4f5c \u4e00\u3001\u7cfb\u7edf\u6570\u636e\u5e93 information_schema\uff1a \u865a\u62df\u5e93\uff0c\u4e0d\u5360\u7528\u78c1\u76d8\u7a7a\u95f4\uff0c\u5b58\u50a8\u7684\u662f\u6570\u636e\u5e93\u542f\u52a8 […]<\/p>\n","protected":false},"author":3,"featured_media":6742,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[3,403],"tags":[],"_links":{"self":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/4897"}],"collection":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4897"}],"version-history":[{"count":0,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/4897\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/media\/6742"}],"wp:attachment":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4897"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4897"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4897"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}