{"id":292,"date":"2021-11-02T10:05:46","date_gmt":"2021-11-02T02:05:46","guid":{"rendered":"http:\/\/47.98.165.52\/?p=292"},"modified":"2021-11-02T10:05:46","modified_gmt":"2021-11-02T02:05:46","slug":"mysql-day-03","status":"publish","type":"post","link":"\/?p=292","title":{"rendered":"MySQL  DAY.03"},"content":{"rendered":"<h1>1\u3001\u7ea6\u675f<\/h1>\n<h2>1.1\u3001\u552f\u4e00\u6027\u7ea6\u675f\uff08unique\uff09<\/h2>\n<p>\u552f\u4e00\u7ea6\u675f\u4fee\u9970\u7684\u5b57\u6bb5\u5177\u6709\u552f\u4e00\u6027\uff0c\u4e0d\u80fd\u91cd\u590d\u3002\u4f46\u53ef\u4ee5\u4e3aNULL\u3002<br \/>\neg.\u6848\u4f8b\uff1a\u7ed9\u67d0\u4e00\u5217\u6dfb\u52a0unique<\/p>\n<pre><code>    drop table if exists t_user;\n    create table t_user(\n        id int,\n        username varchar(255) unique  \/\/ \u5217\u7ea7\u7ea6\u675f\n    );<\/code><\/pre>\n<p><strong><strong>eg.\u6848\u4f8b\uff1a\u7ed9\u4e24\u4e2a\u5217\u6216\u8005\u591a\u4e2a\u5217\u6dfb\u52a0unique<\/strong><\/strong><\/p>\n<pre><code>    drop table if exists t_user;\n    create table t_user(\n        id int, \n        usercode varchar(255),\n        username varchar(255),\n        unique(usercode,username) \/\/ \u591a\u4e2a\u5b57\u6bb5\u8054\u5408\u8d77\u6765\u6dfb\u52a01\u4e2a\u7ea6\u675funique \u3010\u8868\u7ea7\u7ea6\u675f\u3011\n        );<\/code><\/pre>\n<p>. \u6ce8\u610f\uff1anot null\u7ea6\u675f\u53ea\u6709\u5217\u7ea7\u7ea6\u675f\u3002\u6ca1\u6709\u8868\u7ea7\u7ea6\u675f\u3002<\/p>\n<h2>1.2\u3001\u4e3b\u952e\u7ea6\u675f<\/h2>\n<h3>1.2.1\u600e\u4e48\u7ed9\u4e00\u5f20\u8868\u6dfb\u52a0\u4e3b\u952e\u7ea6\u675f\u5462\uff1f<\/h3>\n<pre><code>    drop table if exists t_user;\n    create table t_user(\n        id int primary key,  \/\/ \u5217\u7ea7\u7ea6\u675f\n        username varchar(255),\n        email varchar(255)\n    );\n    insert into t_user(id,username,email) values(1,'zs','zs@123.com');\n    insert into t_user(id,username,email) values(2,'ls','ls@123.com');\n    insert into t_user(id,username,email) values(3,'ww','ww@123.com');\n    select * from t_user;\n    +----+----------+------------+\n    | id | username | email      |\n    +----+----------+------------+\n    |  1 | zs       | zs@123.com |\n    |  2 | ls       | ls@123.com |\n    |  3 | ww       | ww@123.com |\n    +----+----------+------------+\n\n    insert into t_user(id,username,email) values(1,'jack','jack@123.com');\n    ERROR 1062 (23000): Duplicate entry '1' for key 'PRIMARY'\n\n    insert into t_user(username,email) values('jack','jack@123.com');\n    ERROR 1364 (HY000): Field 'id' doesn't have a default value<\/code><\/pre>\n<p>\u6839\u636e\u4ee5\u4e0a\u7684\u6d4b\u8bd5\u5f97\u51fa\uff1aid\u662f\u4e3b\u952e\uff0c\u56e0\u4e3a\u6dfb\u52a0\u4e86\u4e3b\u952e\u7ea6\u675f\uff0c\u4e3b\u952e\u5b57\u6bb5\u4e2d\u7684\u6570\u636e\u4e0d\u80fd\u4e3aNULL\uff0c\u4e5f\u4e0d\u80fd\u91cd\u590d\u3002<\/p>\n<h3>1.2.2\u4e3b\u952e\u7684\u7279\u70b9<\/h3>\n<p><strong>\u4e0d\u80fd\u4e3aNULL\uff0c\u4e5f\u4e0d\u80fd\u91cd\u590d<\/strong>\u3002<\/p>\n<h3>1.2.3\u4e3b\u952e\u76f8\u5173\u7684\u672f\u8bed\uff1f<\/h3>\n<p><strong>\u4e3b\u952e\u7ea6\u675f<\/strong> : primary key<br \/>\n<strong>\u4e3b\u952e\u5b57\u6bb5<\/strong> : id\u5b57\u6bb5\u6dfb\u52a0primary key\u4e4b\u540e\uff0cid\u53eb\u505a\u4e3b\u952e\u5b57\u6bb5<br \/>\n<strong>\u4e3b\u952e\u503c<\/strong> : id\u5b57\u6bb5\u4e2d\u7684\u6bcf\u4e00\u4e2a\u503c\u90fd\u662f\u4e3b\u952e\u503c\u3002<\/p>\n<h3>1.2.4\u4e3b\u952e\u6709\u4ec0\u4e48\u4f5c\u7528\uff1f<\/h3>\n<p>\u8868\u7684\u8bbe\u8ba1\u4e09\u8303\u5f0f\u4e2d\u6709\u8981\u6c42\uff0c\u7b2c\u4e00\u8303\u5f0f\u5c31\u8981\u6c42<strong>\u4efb\u4f55\u4e00\u5f20\u8868\u90fd\u5e94\u8be5\u6709\u4e3b\u952e\u3002<\/strong><\/p>\n<p>\u4e3b\u952e\u7684\u4f5c\u7528\uff1a\u4e3b\u952e\u503c\u662f\u8fd9\u884c\u8bb0\u5f55\u5728\u8fd9\u5f20\u8868\u5f53\u4e2d\u7684\u552f\u4e00\u6807\u8bc6\u3002\uff08\u5c31\u50cf\u4e00\u4e2a\u4eba\u7684\u8eab\u4efd\u8bc1\u53f7\u7801\u4e00\u6837\u3002\uff09<\/p>\n<h3>1.2.5\u4e3b\u952e\u7684\u5206\u7c7b\uff1f<\/h3>\n<p>\u6839\u636e\u4e3b\u952e\u5b57\u6bb5\u7684<strong>\u5b57\u6bb5\u6570\u91cf<\/strong>\u6765\u5212\u5206\uff1a<br \/>\n<strong>\u5355\u4e00\u4e3b\u952e<\/strong>\uff08\u63a8\u8350\u7684\uff0c\u5e38\u7528\u7684\u3002\uff09<br \/>\n<strong>\u590d\u5408\u4e3b\u952e<\/strong>(\u591a\u4e2a\u5b57\u6bb5\u8054\u5408\u8d77\u6765\u6dfb\u52a0\u4e00\u4e2a\u4e3b\u952e\u7ea6\u675f)\uff08\u590d\u5408\u4e3b\u952e\u4e0d\u5efa\u8bae\u4f7f\u7528\uff0c\u56e0\u4e3a\u590d\u5408\u4e3b\u952e\u8fdd\u80cc\u4e09\u8303\u5f0f\u3002\uff09<\/p>\n<p>\u6839\u636e\u4e3b\u952e<strong>\u6027\u8d28<\/strong>\u6765\u5212\u5206\uff1a<br \/>\n<strong>\u81ea\u7136\u4e3b\u952e<\/strong>\uff1a\u4e3b\u952e\u503c\u6700\u597d\u5c31\u662f\u4e00\u4e2a\u548c\u4e1a\u52a1\u6ca1\u6709\u4efb\u4f55\u5173\u7cfb\u7684\u81ea\u7136\u6570\u3002\uff08\u8fd9\u79cd\u65b9\u5f0f\u662f\u63a8\u8350\u7684\uff09<br \/>\n<strong>\u4e1a\u52a1\u4e3b\u952e<\/strong>\uff1a\u4e3b\u952e\u503c\u548c\u7cfb\u7edf\u7684\u4e1a\u52a1\u6302\u94a9\uff0c\u4f8b\u5982\uff1a\u62ff\u7740\u94f6\u884c\u5361\u7684\u5361\u53f7\u505a\u4e3b\u952e\uff0c\u62ff\u7740\u8eab\u4efd\u8bc1\u53f7\u7801\u4f5c\u4e3a\u4e3b\u952e\u3002\uff08\u4e0d\u63a8\u8350\u7528\uff09<\/p>\n<p>\u00b7\u00b7\u00b7\u6700\u597d\u4e0d\u8981\u62ff\u7740\u548c\u4e1a\u52a1\u6302\u94a9\u7684\u5b57\u6bb5\u4f5c\u4e3a\u4e3b\u952e\u3002\u56e0\u4e3a\u4ee5\u540e\u7684\u4e1a\u52a1\u4e00\u65e6\u53d1\u751f\u6539\u53d8\u7684\u65f6\u5019\uff0c\u4e3b\u952e\u503c\u53ef\u80fd\u4e5f\u9700\u8981 \u968f\u7740\u53d1\u751f\u53d8\u5316\uff0c\u4f46\u6709\u7684\u65f6\u5019\u6ca1\u6709\u529e\u6cd5\u53d8\u5316\uff0c\u56e0\u4e3a\u53d8\u5316\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4e3b\u952e\u503c\u91cd\u590d\u3002<\/p>\n<p><strong>\u4e00\u5f20\u8868\u7684\u4e3b\u952e\u7ea6\u675f\u53ea\u80fd\u67091\u4e2a\u3002\uff08\u5fc5\u987b\u8bb0\u4f4f\uff09<\/strong><\/p>\n<h3>1.2.6\u4f7f\u7528\u8868\u7ea7\u7ea6\u675f\u65b9\u5f0f\u5b9a\u4e49\u4e3b\u952e\uff1a<\/h3>\n<pre><code>    drop table if exists t_user;\n    create table t_user(\n        id int,\n        username varchar(255),\n        primary key(id)\n    );\n    insert into t_user(id,username) values(1,'zs');\n    insert into t_user(id,username) values(2,'ls');\n    insert into t_user(id,username) values(3,'ws');\n    insert into t_user(id,username) values(4,'cs');\n    select * from t_user;\n\n    insert into t_user(id,username) values(4,'cx');\n    ERROR 1062 (23000): Duplicate entry '4' for key 'PRIMARY'<\/code><\/pre>\n<p>\u4ee5\u4e0b\u5185\u5bb9\u662f\u6f14\u793a\u4ee5\u4e0b\u590d\u5408\u4e3b\u952e\uff0c\u4e0d\u9700\u8981\u638c\u63e1\uff1a<\/p>\n<pre><code>        drop table if exists t_user;\n        create table t_user(\n            id int,\n            username varchar(255),\n            password varchar(255),\n            primary key(id,username)\n        );\n        insert .......<\/code><\/pre>\n<h3>1.2.7mysql\u63d0\u4f9b\u4e3b\u952e\u503c\u81ea\u589e\uff1a\uff08\u975e\u5e38\u91cd\u8981\u3002\uff09<\/h3>\n<pre><code>    drop table if exists t_user;\n    create table t_user(\n        id int primary key auto_increment, \/\/ id\u5b57\u6bb5\u81ea\u52a8\u7ef4\u62a4\u4e00\u4e2a\u81ea\u589e\u7684\u6570\u5b57\uff0c\u4ece1\u5f00\u59cb\uff0c\u4ee51\u9012\u589e\u3002\n        username varchar(255)\n    );\n    insert into t_user(username) values('a');\n    insert into t_user(username) values('b');\n    insert into t_user(username) values('c');\n    insert into t_user(username) values('d');\n    insert into t_user(username) values('e');\n    insert into t_user(username) values('f');\n    select * from t_user;<\/code><\/pre>\n<p>\u63d0\u793a:Oracle\u5f53\u4e2d\u4e5f\u63d0\u4f9b\u4e86\u4e00\u4e2a\u81ea\u589e\u673a\u5236\uff0c\u53eb\u505a\uff1a\u5e8f\u5217\uff08sequence\uff09\u5bf9\u8c61\u3002<\/p>\n<h2>1.3\u3001\u5916\u952e\u7ea6\u675f<\/h2>\n<h3>1.3.1\u5173\u4e8e\u5916\u952e\u7ea6\u675f\u7684\u76f8\u5173\u672f\u8bed\uff1a<\/h3>\n<p>\u5916\u952e\u7ea6\u675f: foreign key<br \/>\n\u5916\u952e\u5b57\u6bb5\uff1a\u6dfb\u52a0\u6709\u5916\u952e\u7ea6\u675f\u7684\u5b57\u6bb5<br \/>\n\u5916\u952e\u503c\uff1a\u5916\u952e\u5b57\u6bb5\u4e2d\u7684\u6bcf\u4e00\u4e2a\u503c\u3002<\/p>\n<p><strong>\u4e1a\u52a1\u80cc\u666f\uff1a<\/strong><\/p>\n<p>\u8bf7\u8bbe\u8ba1\u6570\u636e\u5e93\u8868\uff0c\u7528\u6765\u7ef4\u62a4\u5b66\u751f\u548c\u73ed\u7ea7\u7684\u4fe1\u606f\uff1f<\/p>\n<p>\u7b2c\u4e00\u79cd\u65b9\u6848\uff1a\u4e00\u5f20\u8868\u5b58\u50a8\u6240\u6709\u6570\u636e<\/p>\n<pre><code>        no(pk)          name            classno         classname\n        -------------------------------------------------------------------------------------------\n        1                   zs1             101             \u5317\u4eac\u5927\u5174\u533a\u7ecf\u6d4e\u6280\u672f\u5f00\u53d1\u533a\u4ea6\u5e84\u4e8c\u4e2d\u9ad8\u4e091\u73ed\n        2                   zs2             101             \u5317\u4eac\u5927\u5174\u533a\u7ecf\u6d4e\u6280\u672f\u5f00\u53d1\u533a\u4ea6\u5e84\u4e8c\u4e2d\u9ad8\u4e091\u73ed\n        3                   zs3             102             \u5317\u4eac\u5927\u5174\u533a\u7ecf\u6d4e\u6280\u672f\u5f00\u53d1\u533a\u4ea6\u5e84\u4e8c\u4e2d\u9ad8\u4e092\u73ed\n        4                   zs4             102             \u5317\u4eac\u5927\u5174\u533a\u7ecf\u6d4e\u6280\u672f\u5f00\u53d1\u533a\u4ea6\u5e84\u4e8c\u4e2d\u9ad8\u4e092\u73ed\n        5                   zs5             102             \u5317\u4eac\u5927\u5174\u533a\u7ecf\u6d4e\u6280\u672f\u5f00\u53d1\u533a\u4ea6\u5e84\u4e8c\u4e2d\u9ad8\u4e092\u73ed\n        \u7f3a\u70b9\uff1a\u5197\u4f59\u3002\u3010\u4e0d\u63a8\u8350\u3011<\/code><\/pre>\n<p>\u7b2c\u4e8c\u79cd\u65b9\u6848\uff1a\u4e24\u5f20\u8868\uff08\u73ed\u7ea7\u8868\u548c\u5b66\u751f\u8868\uff09<\/p>\n<pre><code>        t_class \u73ed\u7ea7\u8868\n        cno(pk)     cname\n        --------------------------------------------------------\n        101     \u5317\u4eac\u5927\u5174\u533a\u7ecf\u6d4e\u6280\u672f\u5f00\u53d1\u533a\u4ea6\u5e84\u4e8c\u4e2d\u9ad8\u4e091\u73ed\n        102     \u5317\u4eac\u5927\u5174\u533a\u7ecf\u6d4e\u6280\u672f\u5f00\u53d1\u533a\u4ea6\u5e84\u4e8c\u4e2d\u9ad8\u4e092\u73ed\n\n        t_student \u5b66\u751f\u8868\n        sno(pk)     sname               classno(\u8be5\u5b57\u6bb5\u6dfb\u52a0\u5916\u952e\u7ea6\u675ffk)\n        ------------------------------------------------------------\n        1               zs1             101\n        2               zs2             101\n        3               zs3             102\n        4               zs4             102\n        5               zs5             102<\/code><\/pre>\n<p>\u5c06\u4ee5\u4e0a\u8868\u7684\u5efa\u8868\u8bed\u53e5\u5199\u51fa\u6765\uff1a<\/p>\n<pre><code>    t_student\u4e2d\u7684classno\u5b57\u6bb5\u5f15\u7528t_class\u8868\u4e2d\u7684cno\u5b57\u6bb5\uff0c\u6b64\u65f6t_student\u8868\u53eb\u505a\u5b50\u8868\u3002t_class\u8868\u53eb\u505a\u7236\u8868\u3002<\/code><\/pre>\n<p>\u987a\u5e8f\u8981\u6c42\uff1a<br \/>\n\u5220\u9664\u6570\u636e\u7684\u65f6\u5019\uff0c\u5148\u5220\u9664\u5b50\u8868\uff0c\u518d\u5220\u9664\u7236\u8868\u3002<br \/>\n\u6dfb\u52a0\u6570\u636e\u7684\u65f6\u5019\uff0c\u5148\u6dfb\u52a0\u7236\u8868\uff0c\u5728\u6dfb\u52a0\u5b50\u8868\u3002<br \/>\n\u521b\u5efa\u8868\u7684\u65f6\u5019\uff0c\u5148\u521b\u5efa\u7236\u8868\uff0c\u518d\u521b\u5efa\u5b50\u8868\u3002<br \/>\n\u5220\u9664\u8868\u7684\u65f6\u5019\uff0c\u5148\u5220\u9664\u5b50\u8868\uff0c\u5728\u5220\u9664\u7236\u8868\u3002<\/p>\n<pre><code>    drop table if exists t_student;\n    drop table if exists t_class;\n\n    create table t_class(\n        cno int,\n        cname varchar(255),\n        primary key(cno)\n    );\n\n    create table t_student(\n        sno int,\n        sname varchar(255),\n        classno int,\n        primary key(sno),\n        foreign key(classno) references t_class(cno)\n    );\n\n    insert into t_class values(101,'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx');\n    insert into t_class values(102,'yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy');\n\n    insert into t_student values(1,'zs1',101);\n    insert into t_student values(2,'zs2',101);\n    insert into t_student values(3,'zs3',102);\n    insert into t_student values(4,'zs4',102);\n    insert into t_student values(5,'zs5',102);\n    insert into t_student values(6,'zs6',102);\n    select * from t_class;\n    select * from t_student;\n\n    insert into t_student values(7,'lisi',103);\n    ERROR 1452 (23000): Cannot add or update a child row: a foreign key constraint fails (<code>bjpowernode<\/code>.INT <code>t_student_ibfk_1<\/code> FOREIGN KEY (<code>classno<\/code>) REFERENCES <code>t_class<\/code> (<code>cno<\/code>))<\/code><\/pre>\n<p>\u5916\u952e\u503c\u53ef\u4ee5\u4e3aNULL\uff1f<br \/>\n\u5916\u952e\u53ef\u4ee5\u4e3aNULL\u3002<\/p>\n<p>\u5916\u952e\u5b57\u6bb5\u5f15\u7528\u5176\u4ed6\u8868\u7684\u67d0\u4e2a\u5b57\u6bb5\u7684\u65f6\u5019\uff0c\u88ab\u5f15\u7528\u7684\u5b57\u6bb5\u5fc5\u987b\u662f\u4e3b\u952e\u5417\uff1f<br \/>\n\u6ce8\u610f\uff1a\u88ab\u5f15\u7528\u7684\u5b57\u6bb5\u4e0d\u4e00\u5b9a\u662f\u4e3b\u952e\uff0c\u4f46\u81f3\u5c11\u5177\u6709unique\u7ea6\u675f\u3002<\/p>\n<h1>2\u3001\u5b58\u50a8\u5f15\u64ce\uff1f\uff08\u6574\u4e2a\u5185\u5bb9\u5c5e\u4e8e\u4e86\u89e3\u5185\u5bb9\uff09<\/h1>\n<h2>2.1\u3001\u5b8c\u6574\u7684\u5efa\u8868\u8bed\u53e5<\/h2>\n<pre><code>    CREATE TABLE <code>t_x<\/code> (\n      <code>id<\/code> int(11) DEFAULT NULL\n    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;\n\n    \u6ce8\u610f\uff1a\u5728MySQL\u5f53\u4e2d\uff0c\u51e1\u662f\u6807\u8bc6\u7b26\u662f\u53ef\u4ee5\u4f7f\u7528\u98d8\u53f7\u62ec\u8d77\u6765\u7684\u3002\u6700\u597d\u522b\u7528\uff0c\u4e0d\u901a\u7528\u3002\n\n    \u5efa\u8868\u7684\u65f6\u5019\u53ef\u4ee5\u6307\u5b9a\u5b58\u50a8\u5f15\u64ce\uff0c\u4e5f\u53ef\u4ee5\u6307\u5b9a\u5b57\u7b26\u96c6\u3002\n\n    mysql\u9ed8\u8ba4\u4f7f\u7528\u7684\u5b58\u50a8\u5f15\u64ce\u662fInnoDB\u65b9\u5f0f\u3002\n    \u9ed8\u8ba4\u91c7\u7528\u7684\u5b57\u7b26\u96c6\u662fUTF8<\/code><\/pre>\n<h2>2.2\u3001\u4ec0\u4e48\u662f\u5b58\u50a8\u5f15\u64ce\u5462\uff1f<\/h2>\n<pre><code>    \u5b58\u50a8\u5f15\u64ce\u8fd9\u4e2a\u540d\u5b57\u53ea\u6709\u5728mysql\u4e2d\u5b58\u5728\u3002\uff08Oracle\u4e2d\u6709\u5bf9\u5e94\u7684\u673a\u5236\uff0c\u4f46\u662f\u4e0d\u53eb\u505a\u5b58\u50a8\u5f15\u64ce\u3002Oracle\u4e2d\u6ca1\u6709\u7279\u6b8a\u7684\u540d\u5b57\uff0c\n    \u5c31\u662f\u201c\u8868\u7684\u5b58\u50a8\u65b9\u5f0f\u201d\uff09\n\n    mysql\u652f\u6301\u5f88\u591a\u5b58\u50a8\u5f15\u64ce\uff0c\u6bcf\u4e00\u4e2a\u5b58\u50a8\u5f15\u64ce\u90fd\u5bf9\u5e94\u4e86\u4e00\u79cd\u4e0d\u540c\u7684\u5b58\u50a8\u65b9\u5f0f\u3002\n    \u6bcf\u4e00\u4e2a\u5b58\u50a8\u5f15\u64ce\u90fd\u6709\u81ea\u5df1\u7684\u4f18\u7f3a\u70b9\uff0c\u9700\u8981\u5728\u5408\u9002\u7684\u65f6\u673a\u9009\u62e9\u5408\u9002\u7684\u5b58\u50a8\u5f15\u64ce\u3002<\/code><\/pre>\n<h2>2.3\u3001\u67e5\u770b\u5f53\u524dmysql\u652f\u6301\u7684\u5b58\u50a8\u5f15\u64ce\uff1f<\/h2>\n<pre><code>    show engines \\G\n\n    mysql 5.5.36\u7248\u672c\u652f\u6301\u7684\u5b58\u50a8\u5f15\u64ce\u67099\u4e2a\uff1a\n        *************************** 1. row ***************************\n                Engine: FEDERATED\n              Support: NO\n              Comment: Federated MySQL storage engine\n        Transactions: NULL\n                     XA: NULL\n          Savepoints: NULL\n        *************************** 2. row ***************************\n                Engine: MRG_MYISAM\n              Support: YES\n              Comment: Collection of identical MyISAM tables\n        Transactions: NO\n                     XA: NO\n          Savepoints: NO\n        *************************** 3. row ***************************\n                Engine: MyISAM\n              Support: YES\n              Comment: MyISAM storage engine\n        Transactions: NO\n                     XA: NO\n          Savepoints: NO\n        *************************** 4. row ***************************\n                Engine: BLACKHOLE\n              Support: YES\n              Comment: \/dev\/null storage engine (anything you write to it disappears)\n        Transactions: NO\n                     XA: NO\n          Savepoints: NO\n        *************************** 5. row ***************************\n                Engine: CSV\n              Support: YES\n              Comment: CSV storage engine\n        Transactions: NO\n                     XA: NO\n          Savepoints: NO\n        *************************** 6. row ***************************\n                Engine: MEMORY\n              Support: YES\n              Comment: Hash based, stored in memory, useful for temporary tables\n        Transactions: NO\n                     XA: NO\n          Savepoints: NO\n        *************************** 7. row ***************************\n                Engine: ARCHIVE\n              Support: YES\n              Comment: Archive storage engine\n        Transactions: NO\n                     XA: NO\n          Savepoints: NO\n        *************************** 8. row ***************************\n                Engine: InnoDB\n              Support: DEFAULT\n              Comment: Supports transactions, row-level locking, and foreign keys\n        Transactions: YES\n                     XA: YES\n          Savepoints: YES\n        *************************** 9. row ***************************\n                Engine: PERFORMANCE_SCHEMA\n              Support: YES\n              Comment: Performance Schema\n        Transactions: NO\n                     XA: NO\n          Savepoints: NO<\/code><\/pre>\n<h2>2.4\u3001\u5e38\u89c1\u7684\u5b58\u50a8\u5f15\u64ce\uff1f<\/h2>\n<pre><code>        Engine: MyISAM\n              Support: YES\n              Comment: MyISAM storage engine\n        Transactions: NO\n                     XA: NO\n          Savepoints: NO\n\n        MyISAM\u8fd9\u79cd\u5b58\u50a8\u5f15\u64ce\u4e0d\u652f\u6301\u4e8b\u52a1\u3002\n        MyISAM\u662fmysql\u6700\u5e38\u7528\u7684\u5b58\u50a8\u5f15\u64ce\uff0c\u4f46\u662f\u8fd9\u79cd\u5f15\u64ce\u4e0d\u662f\u9ed8\u8ba4\u7684\u3002\n        MyISAM\u91c7\u7528\u4e09\u4e2a\u6587\u4ef6\u7ec4\u7ec7\u4e00\u5f20\u8868\uff1a\n            xxx.frm\uff08\u5b58\u50a8\u683c\u5f0f\u7684\u6587\u4ef6\uff09\n            xxx.MYD\uff08\u5b58\u50a8\u8868\u4e2d\u6570\u636e\u7684\u6587\u4ef6\uff09\n            xxx.MYI\uff08\u5b58\u50a8\u8868\u4e2d\u7d22\u5f15\u7684\u6587\u4ef6\uff09\n        \u4f18\u70b9\uff1a\u53ef\u88ab\u538b\u7f29\uff0c\u8282\u7701\u5b58\u50a8\u7a7a\u95f4\u3002\u5e76\u4e14\u53ef\u4ee5\u8f6c\u6362\u4e3a\u53ea\u8bfb\u8868\uff0c\u63d0\u9ad8\u68c0\u7d22\u6548\u7387\u3002\n        \u7f3a\u70b9\uff1a\u4e0d\u652f\u6301\u4e8b\u52a1\u3002\n\n    -----------------------------------------------------------------------------\n\n              Engine: InnoDB\n              Support: DEFAULT\n              Comment: Supports transactions, row-level locking, and foreign keys\n        Transactions: YES\n                     XA: YES\n          Savepoints: YES\n\n        \u4f18\u70b9\uff1a\u652f\u6301\u4e8b\u52a1\u3001\u884c\u7ea7\u9501\u3001\u5916\u952e\u7b49\u3002\u8fd9\u79cd\u5b58\u50a8\u5f15\u64ce\u6570\u636e\u7684\u5b89\u5168\u5f97\u5230\u4fdd\u969c\u3002\n\n        \u8868\u7684\u7ed3\u6784\u5b58\u50a8\u5728xxx.frm\u6587\u4ef6\u4e2d\n        \u6570\u636e\u5b58\u50a8\u5728tablespace\u8fd9\u6837\u7684\u8868\u7a7a\u95f4\u4e2d\uff08\u903b\u8f91\u6982\u5ff5\uff09\uff0c\u65e0\u6cd5\u88ab\u538b\u7f29\uff0c\u65e0\u6cd5\u8f6c\u6362\u6210\u53ea\u8bfb\u3002\n        \u8fd9\u79cdInnoDB\u5b58\u50a8\u5f15\u64ce\u5728MySQL\u6570\u636e\u5e93\u5d29\u6e83\u4e4b\u540e\u63d0\u4f9b\u81ea\u52a8\u6062\u590d\u673a\u5236\u3002\n        InnoDB\u652f\u6301\u7ea7\u8054\u5220\u9664\u548c\u7ea7\u8054\u66f4\u65b0\u3002\n\n    -------------------------------------------------------------------------------------\n\n                Engine: MEMORY\n              Support: YES\n              Comment: Hash based, stored in memory, useful for temporary tables\n        Transactions: NO\n                     XA: NO\n          Savepoints: NO\n\n        \u7f3a\u70b9\uff1a\u4e0d\u652f\u6301\u4e8b\u52a1\u3002\u6570\u636e\u5bb9\u6613\u4e22\u5931\u3002\u56e0\u4e3a\u6240\u6709\u6570\u636e\u548c\u7d22\u5f15\u90fd\u662f\u5b58\u50a8\u5728\u5185\u5b58\u5f53\u4e2d\u7684\u3002\n        \u4f18\u70b9\uff1a\u67e5\u8be2\u901f\u5ea6\u6700\u5feb\u3002\n        \u4ee5\u524d\u53eb\u505aHEPA\u5f15\u64ce\u3002<\/code><\/pre>\n<h1>3\u3001\u4e8b\u52a1\uff08Transaction\uff09<\/h1>\n<h2>3.1\u3001\u4ec0\u4e48\u662f\u4e8b\u52a1\uff1f<\/h2>\n<p>\u4e00\u4e2a\u4e8b\u52a1\u662f\u4e00\u4e2a\u5b8c\u6574\u7684\u4e1a\u52a1\u903b\u8f91\u5355\u5143\uff0c\u4e0d\u53ef\u518d\u5206\u3002<\/p>\n<p>\u6bd4\u5982\uff1a\u94f6\u884c\u8d26\u6237\u8f6c\u8d26\uff0c\u4eceA\u8d26\u6237\u5411B\u8d26\u6237\u8f6c\u8d2610000.\u9700\u8981\u6267\u884c\u4e24\u6761update\u8bed\u53e5\uff1a<\/p>\n<pre><code>update t_act set balance = balance - 10000 where actno = 'act-001';\nupdate t_act set balance = balance + 10000 where actno = 'act-002';<\/code><\/pre>\n<p>\u4ee5\u4e0a\u4e24\u6761DML\u8bed\u53e5\u5fc5\u987b<strong>\u540c\u65f6\u6210\u529f\uff0c\u6216\u8005\u540c\u65f6\u5931\u8d25<\/strong>\uff0c\u4e0d\u5141\u8bb8\u51fa\u73b0\u4e00\u6761\u6210\u529f\uff0c\u4e00\u6761\u5931\u8d25\u3002<\/p>\n<p>\u8981\u60f3\u4fdd\u8bc1\u4ee5\u4e0a\u7684\u4e24\u6761DML\u8bed\u53e5\u540c\u65f6\u6210\u529f\u6216\u8005\u540c\u65f6\u5931\u8d25\uff0c\u90a3\u4e48\u5c31\u9700\u8981\u4f7f\u7528\u6570\u636e\u5e93\u7684\u201c\u4e8b\u52a1\u673a\u5236\u201d\u3002<\/p>\n<h2>3.2\u3001\u548c\u4e8b\u52a1\u76f8\u5173\u7684\u8bed\u53e5\u53ea\u6709\uff1aDML\u8bed\u53e5\u3002\uff08insert delete update\uff09<\/h2>\n<p>\u4e3a\u4ec0\u4e48\uff1f\u56e0\u4e3a\u5b83\u4eec\u8fd9\u4e09\u4e2a\u8bed\u53e5\u90fd\u662f\u548c\u6570\u636e\u5e93\u8868\u5f53\u4e2d\u7684\u201c\u6570\u636e\u201d\u76f8\u5173\u7684\u3002<br \/>\n\u4e8b\u52a1\u7684\u5b58\u5728\u662f\u4e3a\u4e86\u4fdd\u8bc1\u6570\u636e\u7684\u5b8c\u6574\u6027\uff0c\u5b89\u5168\u6027\u3002<\/p>\n<h2>3.3\u5047\u8bbe\u6240\u6709\u7684\u4e1a\u52a1\u90fd\u80fd\u4f7f\u75281\u6761DML\u8bed\u53e5\u641e\u5b9a\uff0c\u8fd8\u9700\u8981\u4e8b\u52a1\u673a\u5236\u5417\uff1f<\/h2>\n<p>\u4e0d\u9700\u8981\u4e8b\u52a1\u3002<br \/>\n\u4f46\u5b9e\u9645\u60c5\u51b5\u4e0d\u662f\u8fd9\u6837\u7684\uff0c\u901a\u5e38\u4e00\u4e2a\u201c\u4e8b\u513f\uff08\u4e8b\u52a1\u3010\u4e1a\u52a1\u3011\uff09\u201d\u9700\u8981\u591a\u6761DML\u8bed\u53e5\u5171\u540c\u8054\u5408\u5b8c\u6210\u3002<\/p>\n<h2>3.4\u3001\u4e8b\u52a1\u7684\u7279\u6027\uff1f<\/h2>\n<p>\u4e8b\u52a1\u5305\u62ec<strong>\u56db\u5927\u7279\u6027<\/strong>\uff1aACID<br \/>\nA: \u539f\u5b50\u6027\uff1a\u4e8b\u52a1\u662f\u6700\u5c0f\u7684\u5de5\u4f5c\u5355\u5143\uff0c\u4e0d\u53ef\u518d\u5206\u3002<br \/>\nC: \u4e00\u81f4\u6027\uff1a\u4e8b\u52a1\u5fc5\u987b\u4fdd\u8bc1\u591a\u6761DML\u8bed\u53e5\u540c\u65f6\u6210\u529f\u6216\u8005\u540c\u65f6\u5931\u8d25\u3002<br \/>\nI\uff1a\u9694\u79bb\u6027\uff1a\u4e8b\u52a1A\u4e0e\u4e8b\u52a1B\u4e4b\u95f4\u5177\u6709\u9694\u79bb\u3002<br \/>\nD\uff1a\u6301\u4e45\u6027\uff1a\u6301\u4e45\u6027\u8bf4\u7684\u662f\u6700\u7ec8\u6570\u636e\u5fc5\u987b\u6301\u4e45\u5316\u5230\u786c\u76d8\u6587\u4ef6\u4e2d\uff0c\u4e8b\u52a1\u624d\u7b97\u6210\u529f\u7684\u7ed3\u675f\u3002<\/p>\n<h2>3.5\u3001\u5173\u4e8e\u4e8b\u52a1\u4e4b\u95f4\u7684\u9694\u79bb\u6027<\/h2>\n<p>\u4e8b\u52a1\u9694\u79bb\u6027\u5b58\u5728\u9694\u79bb\u7ea7\u522b\uff0c\u7406\u8bba\u4e0a\u9694\u79bb\u7ea7\u522b\u5305\u62ec4\u4e2a\uff1a<br \/>\n<strong>\u7b2c\u4e00\u7ea7\u522b\uff1a\u8bfb\u672a\u63d0\u4ea4\uff08read uncommitted\uff09<\/strong><br \/>\n\u5bf9\u65b9\u4e8b\u52a1\u8fd8\u6ca1\u6709\u63d0\u4ea4\uff0c\u6211\u4eec\u5f53\u524d\u4e8b\u52a1\u53ef\u4ee5\u8bfb\u53d6\u5230\u5bf9\u65b9\u672a\u63d0\u4ea4\u7684\u6570\u636e\u3002<br \/>\n\u8bfb\u672a\u63d0\u4ea4\u5b58\u5728\u810f\u8bfb\uff08Dirty Read\uff09\u73b0\u8c61\uff1a\u8868\u793a\u8bfb\u5230\u4e86\u810f\u7684\u6570\u636e\u3002<br \/>\n<strong>\u7b2c\u4e8c\u7ea7\u522b\uff1a\u8bfb\u5df2\u63d0\u4ea4\uff08read committed\uff09<\/strong><br \/>\n\u5bf9\u65b9\u4e8b\u52a1\u63d0\u4ea4\u4e4b\u540e\u7684\u6570\u636e\u6211\u65b9\u53ef\u4ee5\u8bfb\u53d6\u5230\u3002<br \/>\n\u8fd9\u79cd\u9694\u79bb\u7ea7\u522b\u89e3\u51b3\u4e86: \u810f\u8bfb\u73b0\u8c61\u6ca1\u6709\u4e86\u3002<br \/>\n\u8bfb\u5df2\u63d0\u4ea4\u5b58\u5728\u7684\u95ee\u9898\u662f\uff1a\u4e0d\u53ef\u91cd\u590d\u8bfb\u3002<br \/>\n<strong>\u7b2c\u4e09\u7ea7\u522b\uff1a\u53ef\u91cd\u590d\u8bfb\uff08repeatable read\uff09<\/strong><br \/>\n\u8fd9\u79cd\u9694\u79bb\u7ea7\u522b\u89e3\u51b3\u4e86\uff1a\u4e0d\u53ef\u91cd\u590d\u8bfb\u95ee\u9898\u3002<br \/>\n\u8fd9\u79cd\u9694\u79bb\u7ea7\u522b\u5b58\u5728\u7684\u95ee\u9898\u662f\uff1a\u8bfb\u53d6\u5230\u7684\u6570\u636e\u662f\u5e7b\u8c61\u3002<br \/>\n<strong>\u7b2c\u56db\u7ea7\u522b\uff1a\u5e8f\u5217\u5316\u8bfb\/\u4e32\u884c\u5316\u8bfb\uff08serializable\uff09<\/strong><br \/>\n\u89e3\u51b3\u4e86\u6240\u6709\u95ee\u9898\u3002<br \/>\n\u6548\u7387\u4f4e\u3002\u9700\u8981\u4e8b\u52a1\u6392\u961f\u3002<\/p>\n<p>oracle\u6570\u636e\u5e93\u9ed8\u8ba4\u7684\u9694\u79bb\u7ea7\u522b\u662f\uff1a\u8bfb\u5df2\u63d0\u4ea4\u3002<br \/>\nmysql\u6570\u636e\u5e93\u9ed8\u8ba4\u7684\u9694\u79bb\u7ea7\u522b\u662f\uff1a\u53ef\u91cd\u590d\u8bfb\u3002<\/p>\n<h2>3.6\u3001\u6f14\u793a\u4e8b\u52a1<\/h2>\n<ul>\n<li>\n<p>mysql\u4e8b\u52a1\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u662f\u81ea\u52a8\u63d0\u4ea4\u7684\u3002\uff08\u4ec0\u4e48\u662f\u81ea\u52a8\u63d0\u4ea4\uff1f\u53ea\u8981\u6267\u884c\u4efb\u610f\u4e00\u6761DML\u8bed\u53e5\u5219\u63d0\u4ea4\u4e00\u6b21\u3002\uff09\u600e\u4e48\u5173\u95ed\u81ea\u52a8\u63d0\u4ea4\uff1fstart transaction;<\/p>\n<\/li>\n<li>\n<p>\u51c6\u5907\u8868\uff1a<\/p>\n<\/li>\n<li>\n<pre><code>    drop table if exists t_user;\n    create table t_user(\n        id int primary key auto_increment,\n        username varchar(255)\n    );<\/code><\/pre>\n<\/li>\n<li>\n<p>\u6f14\u793a\uff1amysql\u4e2d\u7684\u4e8b\u52a1\u662f\u652f\u6301\u81ea\u52a8\u63d0\u4ea4\u7684\uff0c\u53ea\u8981\u6267\u884c\u4e00\u6761DML\uff0c\u5219\u63d0\u4ea4\u4e00\u6b21\u3002<\/p>\n<\/li>\n<li>\n<pre><code>    mysql> insert into t_user(username) values('zs');\n    Query OK, 1 row affected (0.03 sec)\n\n    mysql> select * from t_user;\n    +----+----------+\n    | id | username |\n    +----+----------+\n    |  1 | zs       |\n    +----+----------+\n    1 row in set (0.00 sec)\n\n    mysql> rollback;\n    Query OK, 0 rows affected (0.00 sec)\n\n    mysql> select * from t_user;\n    +----+----------+\n    | id | username |\n    +----+----------+\n    |  1 | zs       |\n    +----+----------+\n    1 row in set (0.00 sec)<\/code><\/pre>\n<\/li>\n<li>\n<p>\u6f14\u793a\uff1a\u4f7f\u7528start transaction;\u5173\u95ed\u81ea\u52a8\u63d0\u4ea4\u673a\u5236\u3002<\/p>\n<\/li>\n<li>\n<pre><code>    mysql> start transaction;\n    Query OK, 0 rows affected (0.00 sec)\n\n    mysql> insert into t_user(username) values('lisi');\n    Query OK, 1 row affected (0.00 sec)\n\n    mysql> select * from t_user;\n    +----+----------+\n    | id | username |\n    +----+----------+\n    |  1 | zs       |\n    |  2 | lisi     |\n    +----+----------+\n    2 rows in set (0.00 sec)\n\n    mysql> insert into t_user(username) values('wangwu');\n    Query OK, 1 row affected (0.00 sec)\n\n    mysql> select * from t_user;\n    +----+----------+\n    | id | username |\n    +----+----------+\n    |  1 | zs       |\n    |  2 | lisi     |\n    |  3 | wangwu   |\n    +----+----------+\n    3 rows in set (0.00 sec)\n\n    mysql> rollback;\n    Query OK, 0 rows affected (0.02 sec)\n\n    mysql> select * from t_user;\n    +----+----------+\n    | id | username |\n    +----+----------+\n    |  1 | zs       |\n    +----+----------+\n    1 row in set (0.00 sec)<\/code><\/pre>\n<\/li>\n<\/ul>\n<hr \/>\n<pre><code>        mysql> start transaction;\n        Query OK, 0 rows affected (0.00 sec)\n\n        mysql> insert into t_user(username) values('wangwu');\n        Query OK, 1 row affected (0.00 sec)\n\n        mysql> insert into t_user(username) values('rose');\n        Query OK, 1 row affected (0.00 sec)\n\n        mysql> insert into t_user(username) values('jack');\n        Query OK, 1 row affected (0.00 sec)\n\n        mysql> select * from t_user;\n        +----+----------+\n        | id | username |\n        +----+----------+\n        |  1 | zs       |\n        |  4 | wangwu   |\n        |  5 | rose     |\n        |  6 | jack     |\n        +----+----------+\n        4 rows in set (0.00 sec)\n\n        mysql> commit;\n        Query OK, 0 rows affected (0.04 sec)\n\n        mysql> select * from t_user;\n        +----+----------+\n        | id | username |\n        +----+----------+\n        |  1 | zs       |\n        |  4 | wangwu   |\n        |  5 | rose     |\n        |  6 | jack     |\n        +----+----------+\n        4 rows in set (0.00 sec)\n\n        mysql> rollback;\n        Query OK, 0 rows affected (0.00 sec)\n\n        mysql> select * from t_user;\n        +----+----------+\n        | id | username |\n        +----+----------+\n        |  1 | zs       |\n        |  4 | wangwu   |\n        |  5 | rose     |\n        |  6 | jack     |\n        +----+----------+\n        4 rows in set (0.00 sec)<\/code><\/pre>\n<h2>3.7\u6f14\u793a\u4e24\u4e2a\u4e8b\u52a1\uff0c\u5047\u5982\u9694\u79bb\u7ea7\u522b<\/h2>\n<p><strong>\u6f14\u793a\u7b2c1\u7ea7\u522b\uff1a\u8bfb\u672a\u63d0\u4ea4<\/strong><br \/>\n\u8bbe\u7f6e\u4e8b\u52a1\u7684\u5168\u5c40\u9694\u79bb\u7ea7\u522b\uff1aset global transaction isolation level read uncommitted;<br \/>\n\u67e5\u770b\u4e8b\u52a1\u7684\u5168\u5c40\u9694\u79bb\u7ea7\u522b\uff1a<\/p>\n<pre><code>mysql> select @@global.transaction_isolation;\n+--------------------------------+\n| @@global.transaction_isolation |\n+--------------------------------+\n| READ-UNCOMMITTED               |\n+--------------------------------+<\/code><\/pre>\n<p><strong>\u6f14\u793a\u7b2c2\u7ea7\u522b\uff1a\u8bfb\u5df2\u63d0\u4ea4<\/strong><br \/>\nset global transaction isolation level read committed;<br \/>\n<strong>\u6f14\u793a\u7b2c3\u7ea7\u522b\uff1a\u53ef\u91cd\u590d\u8bfb<\/strong><br \/>\nset global transaction isolation level repeatable read;<br \/>\n<strong>\u6f14\u793a\u7b2c4\u7ea7\u522b\uff1a\u5e8f\u5217\u5316\u8bfb\/\u4e32\u884c\u5316\u8bfb\uff08serializable\uff09<\/strong><br \/>\nset global transaction isolation level serializable read;<\/p>\n<ul>\n<li>mysql\u8fdc\u7a0b\u767b\u5f55\uff1amysql -h192.168.151.18 -uroot -p444<\/li>\n<\/ul>\n<h1>4\u3001\u7d22\u5f15<\/h1>\n<h2>4.1\u3001\u4ec0\u4e48\u662f\u7d22\u5f15\uff1f\u6709\u4ec0\u4e48\u7528\uff1f<\/h2>\n<p>\u7d22\u5f15\u5c31\u76f8\u5f53\u4e8e\u4e00\u672c\u4e66\u7684\u76ee\u5f55\uff0c\u901a\u8fc7\u76ee\u5f55\u53ef\u4ee5\u5feb\u901f\u7684\u627e\u5230\u5bf9\u5e94\u7684\u8d44\u6e90\u3002<br \/>\n\u5728\u6570\u636e\u5e93\u65b9\u9762\uff0c\u67e5\u8be2\u4e00\u5f20\u8868\u7684\u65f6\u5019\u6709\u4e24\u79cd\u68c0\u7d22\u65b9\u5f0f\uff1a<br \/>\n\u7b2c\u4e00\u79cd\u65b9\u5f0f\uff1a\u5168\u8868\u626b\u63cf<br \/>\n\u7b2c\u4e8c\u79cd\u65b9\u5f0f\uff1a\u6839\u636e\u7d22\u5f15\u68c0\u7d22\uff08\u6548\u7387\u5f88\u9ad8\uff09<\/p>\n<p>\u7d22\u5f15\u4e3a\u4ec0\u4e48\u53ef\u4ee5\u63d0\u9ad8\u68c0\u7d22\u6548\u7387\u5462\uff1f<br \/>\n\u5176\u5b9e\u6700\u6839\u672c\u7684\u539f\u7406\u662f\u7f29\u5c0f\u4e86\u626b\u63cf\u7684\u8303\u56f4\u3002<\/p>\n<p>\u7d22\u5f15\u867d\u7136\u53ef\u4ee5\u63d0\u9ad8\u68c0\u7d22\u6548\u7387\uff0c\u4f46\u662f\u4e0d\u80fd\u968f\u610f\u7684\u6dfb\u52a0\u7d22\u5f15\uff0c\u56e0\u4e3a<strong>\u7d22\u5f15\u4e5f\u662f\u6570\u636e\u5e93\u5f53\u4e2d\u7684\u5bf9\u8c61\uff0c\u4e5f\u9700\u8981\u6570\u636e\u5e93\u4e0d\u65ad\u7684\u7ef4\u62a4\u3002\u662f\u6709\u7ef4\u62a4\u6210\u672c\u7684\u3002\u6bd4\u5982\uff0c\u8868\u4e2d\u7684\u6570\u636e\u7ecf\u5e38\u88ab\u4fee\u6539\uff0c\u8fd9\u6837\u5c31\u4e0d\u9002\u5408\u6dfb\u52a0\u7d22\u5f15\uff0c\u56e0\u4e3a\u6570\u636e\u4e00\u65e6\u4fee\u6539\uff0c\u7d22\u5f15\u9700\u8981\u91cd\u65b0\u6392\u5e8f\uff0c\u8fdb\u884c\u7ef4\u62a4\u3002 <\/strong><\/p>\n<p>\u6dfb\u52a0\u7d22\u5f15\u662f\u7ed9\u67d0\u4e00\u4e2a\u5b57\u6bb5\uff0c\u6216\u8005\u8bf4\u67d0\u4e9b\u5b57\u6bb5\u6dfb\u52a0\u7d22\u5f15\u3002<\/p>\n<p>select ename,sal from emp where ename = 'SMITH';<br \/>\n\u5f53ename\u5b57\u6bb5\u4e0a\u6ca1\u6709\u6dfb\u52a0\u7d22\u5f15\u7684\u65f6\u5019\uff0c\u4ee5\u4e0asql\u8bed\u53e5\u4f1a\u8fdb\u884c\u5168\u8868\u626b\u63cf\uff0c\u626b\u63cfename\u5b57\u6bb5\u4e2d\u6240\u6709\u7684\u503c\u3002<br \/>\n\u5f53ename\u5b57\u6bb5\u4e0a\u6dfb\u52a0\u7d22\u5f15\u7684\u65f6\u5019\uff0c\u4ee5\u4e0asql\u8bed\u53e5\u4f1a\u6839\u636e\u7d22\u5f15\u626b\u63cf\uff0c\u5feb\u901f\u5b9a\u4f4d\u3002<\/p>\n<h2>4.2\u3001\u600e\u4e48\u521b\u5efa\u7d22\u5f15\u5bf9\u8c61\uff1f\u600e\u4e48\u5220\u9664\u7d22\u5f15\u5bf9\u8c61\uff1f<\/h2>\n<pre><code>\u521b\u5efa\u7d22\u5f15\u5bf9\u8c61\uff1a\n        create index \u7d22\u5f15\u540d\u79f0 on \u8868\u540d(\u5b57\u6bb5\u540d);\n\u5220\u9664\u7d22\u5f15\u5bf9\u8c61\uff1a\n        drop index \u7d22\u5f15\u540d\u79f0 on \u8868\u540d;<\/code><\/pre>\n<h2>4.3\u3001\u4ec0\u4e48\u65f6\u5019\u8003\u8651\u7ed9\u5b57\u6bb5\u6dfb\u52a0\u7d22\u5f15\uff1f\uff08\u6ee1\u8db3\u4ec0\u4e48\u6761\u4ef6\uff09<\/h2>\n<ul>\n<li>\u6570\u636e\u91cf\u5e9e\u5927\u3002\uff08\u6839\u636e\u5ba2\u6237\u7684\u9700\u6c42\uff0c\u6839\u636e\u7ebf\u4e0a\u7684\u73af\u5883\uff09<\/li>\n<li>\u8be5\u5b57\u6bb5\u5f88\u5c11\u7684DML\u64cd\u4f5c\u3002\uff08\u56e0\u4e3a\u5b57\u6bb5\u8fdb\u884c\u4fee\u6539\u64cd\u4f5c\uff0c\u7d22\u5f15\u4e5f\u9700\u8981\u7ef4\u62a4\uff09<\/li>\n<li>\u8be5\u5b57\u6bb5\u7ecf\u5e38\u51fa\u73b0\u5728where\u5b50\u53e5\u4e2d\u3002\uff08\u7ecf\u5e38\u6839\u636e\u54ea\u4e2a\u5b57\u6bb5\u67e5\u8be2\uff09<\/li>\n<\/ul>\n<h2>4.4\u3001\u6ce8\u610f\uff1a\u4e3b\u952e\u548c\u5177\u6709unique\u7ea6\u675f\u7684\u5b57\u6bb5\u81ea\u52a8\u4f1a\u6dfb\u52a0\u7d22\u5f15\u3002<\/h2>\n<p>\u6839\u636e\u4e3b\u952e\u67e5\u8be2\u6548\u7387\u8f83\u9ad8\u3002\u5c3d\u91cf\u6839\u636e\u4e3b\u952e\u68c0\u7d22\u3002<\/p>\n<h2>4.5\u3001\u67e5\u770bsql\u8bed\u53e5\u7684\u6267\u884c\u8ba1\u5212\uff1a<\/h2>\n<pre><code>    mysql> explain select ename,sal from emp where sal = 5000;\n    +----+-------------+-------+------+---------------+------+---------+------+------+-------------+\n    | id | select_type | table | type | possible_keys | key  | key_len | ref  | rows | Extra       |\n    +----+-------------+-------+------+---------------+------+---------+------+------+-------------+\n    |  1 | SIMPLE      | emp   | ALL  | NULL          | NULL | NULL    | NULL |   14 | Using where |\n    +----+-------------+-------+------+---------------+------+---------+------+------+-------------+<\/code><\/pre>\n<p>\u7ed9\u85aa\u8d44sal\u5b57\u6bb5\u6dfb\u52a0\u7d22\u5f15\uff1a<\/p>\n<pre><code>    create index emp_sal_index on emp(sal);\n\n    mysql> explain select ename,sal from emp where sal = 5000;\n    +----+-------------+-------+------+---------------+---------------+---------+-------+------+-------------+\n    | id | select_type | table | type | possible_keys | key           | key_len | ref   | rows | Extra       |\n    +----+-------------+-------+------+---------------+---------------+---------+-------+------+-------------+\n    |  1 | SIMPLE      | emp   | ref  | emp_sal_index | emp_sal_index | 9       | const |    1 | Using where |\n    +----+-------------+-------+------+---------------+---------------+---------+-------+------+-------------+<\/code><\/pre>\n<h2>4.6\u3001\u7d22\u5f15\u5e95\u5c42\u91c7\u7528\u7684\u6570\u636e\u7ed3\u6784\u662f\uff1aB + Tree<\/h2>\n<h2>4.7\u3001\u7d22\u5f15\u7684\u5b9e\u73b0\u539f\u7406\uff1f<\/h2>\n<p><strong>\u901a\u8fc7B Tree\u7f29\u5c0f\u626b\u63cf\u8303\u56f4\uff0c\u5e95\u5c42\u7d22\u5f15\u8fdb\u884c\u4e86\u6392\u5e8f\uff0c\u5206\u533a\uff0c\u7d22\u5f15\u4f1a\u643a\u5e26\u6570\u636e\u5728\u8868\u4e2d\u7684\u201c\u7269\u7406\u5730\u5740\u201d\uff0c\u6700\u7ec8\u901a\u8fc7\u7d22\u5f15\u68c0\u7d22\u5230\u6570\u636e\u4e4b\u540e\uff0c\u83b7\u53d6\u5230\u5173\u8054\u7684\u7269\u7406\u5730\u5740\uff0c\u901a\u8fc7\u7269\u7406\u5730\u5740\u5b9a\u4f4d\u8868\u4e2d\u7684\u6570\u636e\uff0c\u6548\u7387\u662f\u6700\u9ad8\u7684\u3002<\/strong><\/p>\n<pre><code>select ename from emp where ename = 'SMITH';\n\u901a\u8fc7\u7d22\u5f15\u8f6c\u6362\u4e3a\uff1a\nselect ename from emp where \u7269\u7406\u5730\u5740 = 0x3;<\/code><\/pre>\n<h2>4.8\u3001\u7d22\u5f15\u7684\u5206\u7c7b\uff1f<\/h2>\n<p>\u5355\u4e00\u7d22\u5f15\uff1a\u7ed9\u5355\u4e2a\u5b57\u6bb5\u6dfb\u52a0\u7d22\u5f15<br \/>\n\u590d\u5408\u7d22\u5f15:   \u7ed9\u591a\u4e2a\u5b57\u6bb5\u8054\u5408\u8d77\u6765\u6dfb\u52a01\u4e2a\u7d22\u5f15<br \/>\n\u4e3b\u952e\u7d22\u5f15\uff1a\u4e3b\u952e\u4e0a\u4f1a\u81ea\u52a8\u6dfb\u52a0\u7d22\u5f15<br \/>\n\u552f\u4e00\u7d22\u5f15\uff1a\u6709unique\u7ea6\u675f\u7684\u5b57\u6bb5\u4e0a\u4f1a\u81ea\u52a8\u6dfb\u52a0\u7d22\u5f15<br \/>\n....<\/p>\n<h2>4.9\u3001\u7d22\u5f15\u4ec0\u4e48\u65f6\u5019\u5931\u6548\uff1f<\/h2>\n<pre><code>select ename from emp where ename like '%A%';<\/code><\/pre>\n<p>\u6a21\u7cca\u67e5\u8be2\u7684\u65f6\u5019\uff0c\u7b2c\u4e00\u4e2a\u901a\u914d\u7b26\u4f7f\u7528\u7684\u662f%\uff0c\u8fd9\u4e2a\u65f6\u5019\u7d22\u5f15\u662f\u5931\u6548\u7684\u3002<\/p>\n<h1>5\u3001\u89c6\u56fe(view)<\/h1>\n<h2>5.1\u3001\u4ec0\u4e48\u662f\u89c6\u56fe\uff1f<\/h2>\n<p>\u7ad9\u5728\u4e0d\u540c\u7684\u89d2\u5ea6\u53bb\u770b\u5230\u6570\u636e\u3002\uff08\u540c\u4e00\u5f20\u8868\u7684\u6570\u636e\uff0c\u901a\u8fc7\u4e0d\u540c\u7684\u89d2\u5ea6\u53bb\u770b\u5f85\uff09\u3002<\/p>\n<h2>5.2\u3001\u600e\u4e48\u521b\u5efa\u89c6\u56fe\uff1f\u600e\u4e48\u5220\u9664\u89c6\u56fe\uff1f<\/h2>\n<pre><code>create view myview as select empno,ename from emp;\ndrop view myview;<\/code><\/pre>\n<p>\u6ce8\u610f\uff1a\u53ea\u6709DQL\u8bed\u53e5\u624d\u80fd\u4ee5\u89c6\u56fe\u5bf9\u8c61\u7684\u65b9\u5f0f\u521b\u5efa\u51fa\u6765\u3002<\/p>\n<h2>5.3\u3001\u5bf9\u89c6\u56fe\u8fdb\u884c\u589e\u5220\u6539\u67e5\uff0c\u4f1a\u5f71\u54cd\u5230\u539f\u8868\u6570\u636e\u3002<\/h2>\n<p>\uff08\u901a\u8fc7\u89c6\u56fe\u5f71\u54cd\u539f\u8868\u6570\u636e\u7684\uff0c\u4e0d\u662f\u76f4\u63a5\u64cd\u4f5c\u7684\u539f\u8868\uff09<br \/>\n\u53ef\u4ee5\u5bf9\u89c6\u56fe\u8fdb\u884cCRUD\u64cd\u4f5c\u3002<\/p>\n<h2>5.4\u3001\u9762\u5411\u89c6\u56fe\u64cd\u4f5c\uff1f<\/h2>\n<pre><code>    mysql> select * from myview;\n    +-------+--------+\n    | empno | ename  |\n    +-------+--------+\n    |  7369 | SMITH  |\n    |  7499 | ALLEN  |\n    |  7521 | WARD   |\n    |  7566 | JONES  |\n    |  7654 | MARTIN |\n    |  7698 | BLAKE  |\n    |  7782 | CLARK  |\n    |  7788 | SCOTT  |\n    |  7839 | KING   |\n    |  7844 | TURNER |\n    |  7876 | ADAMS  |\n    |  7900 | JAMES  |\n    |  7902 | FORD   |\n    |  7934 | MILLER |\n    +-------+--------+\n\n    create table emp_bak as select * from emp;\n    create view myview1 as select empno,ename,sal from emp_bak;\n    update myview1 set ename='hehe',sal=1 where empno = 7369; \/\/ \u901a\u8fc7\u89c6\u56fe\u4fee\u6539\u539f\u8868\u6570\u636e\u3002\n    delete from myview1 where empno = 7369; \/\/ \u901a\u8fc7\u89c6\u56fe\u5220\u9664\u539f\u8868\u6570\u636e\u3002<\/code><\/pre>\n<h2>5.5\u3001\u89c6\u56fe\u7684\u4f5c\u7528\uff1f<\/h2>\n<p>\u89c6\u56fe\u53ef\u4ee5\u9690\u85cf\u8868\u7684\u5b9e\u73b0\u7ec6\u8282\u3002\u4fdd\u5bc6\u7ea7\u522b\u8f83\u9ad8\u7684\u7cfb\u7edf\uff0c\u6570\u636e\u5e93\u53ea\u5bf9\u5916\u63d0\u4f9b\u76f8\u5173\u7684\u89c6\u56fe\uff0cjava\u7a0b\u5e8f\u5458<br \/>\n\u53ea\u5bf9\u89c6\u56fe\u5bf9\u8c61\u8fdb\u884cCRUD\u3002<\/p>\n<h1>6\u3001DBA\u547d\u4ee4<\/h1>\n<h2>6.1\u3001\u5c06\u6570\u636e\u5e93\u5f53\u4e2d\u7684\u6570\u636e\u5bfc\u51fa<\/h2>\n<p>\u5728windows\u7684dos\u547d\u4ee4\u7a97\u53e3\u4e2d\u6267\u884c\uff1a\uff08\u5bfc\u51fa\u6574\u4e2a\u5e93\uff09<\/p>\n<pre><code>mysqldump bjpowernode>D:\\bjpowernode.sql -uroot -p333<\/code><\/pre>\n<p>\u5728windows\u7684dos\u547d\u4ee4\u7a97\u53e3\u4e2d\u6267\u884c\uff1a\uff08\u5bfc\u51fa\u6307\u5b9a\u6570\u636e\u5e93\u5f53\u4e2d\u7684\u6307\u5b9a\u8868\uff09<\/p>\n<pre><code>mysqldump bjpowernode emp>D:\\bjpowernode.sql -uroot \u2013p123<\/code><\/pre>\n<h2>6.2\u3001\u5bfc\u5165\u6570\u636e<\/h2>\n<pre><code>create database bjpowernode;\nuse bjpowernode;\nsource D:\\bjpowernode.sql<\/code><\/pre>\n<h1>7\u3001\u6570\u636e\u5e93\u8bbe\u8ba1\u4e09\u8303\u5f0f\uff08\u91cd\u70b9\u5185\u5bb9\uff0c\u9762\u8bd5\u7ecf\u5e38\u95ee\uff09<\/h1>\n<h2>7.1\u3001\u4ec0\u4e48\u662f\u8bbe\u8ba1\u8303\u5f0f\uff1f<\/h2>\n<pre><code>    \u8bbe\u8ba1\u8868\u7684\u4f9d\u636e\u3002\u6309\u7167\u8fd9\u4e2a\u4e09\u8303\u5f0f\u8bbe\u8ba1\u7684\u8868\u4e0d\u4f1a\u51fa\u73b0\u6570\u636e\u5197\u4f59\u3002<\/code><\/pre>\n<h2>7.2\u3001\u4e09\u8303\u5f0f\u90fd\u662f\u54ea\u4e9b\uff1f<\/h2>\n<p><strong>\u7b2c\u4e00\u8303\u5f0f<\/strong>\uff1a\u4efb\u4f55\u4e00\u5f20\u8868\u90fd\u5e94\u8be5\u6709\u4e3b\u952e\uff0c\u5e76\u4e14\u6bcf\u4e00\u4e2a\u5b57\u6bb5\u539f\u5b50\u6027\u4e0d\u53ef\u518d\u5206\u3002<\/p>\n<p><strong>\u7b2c\u4e8c\u8303\u5f0f<\/strong>\uff1a\u5efa\u7acb\u5728\u7b2c\u4e00\u8303\u5f0f\u7684\u57fa\u7840\u4e4b\u4e0a\uff0c\u6240\u6709\u975e\u4e3b\u952e\u5b57\u6bb5\u5b8c\u5168\u4f9d\u8d56\u4e3b\u952e\uff0c\u4e0d\u80fd\u4ea7\u751f\u90e8\u5206\u4f9d\u8d56\u3002<\/p>\n<p><strong>\u80cc\u4f1a\uff1a\u591a\u5bf9\u591a\uff1f\u4e09\u5f20\u8868\uff0c\u5173\u7cfb\u8868\u4e24\u4e2a\u5916\u952e\u3002<\/strong><\/p>\n<p>..........<strong><em>t_student\u5b66\u751f\u8868<\/em><\/strong><\/p>\n<table>\n<thead>\n<tr>\n<th>sno(pk)<\/th>\n<th>sname<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1<\/td>\n<td>\u5f20\u4e09<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>\u674e\u56db<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>\u738b\u4e94<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>.....<strong><em>t_teacher \u8bb2\u5e08\u8868<\/em><\/strong><\/p>\n<table>\n<thead>\n<tr>\n<th>tno(pk)<\/th>\n<th>tname<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1<\/td>\n<td>\u738b\u8001\u5e08<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>\u5f20\u8001\u5e08<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>\u674e\u8001\u5e08<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong><em>t_student_teacher_relation \u5b66\u751f\u8bb2\u5e08\u5173\u7cfb\u8868<\/em><\/strong><\/p>\n<table>\n<thead>\n<tr>\n<th>id(pk)<\/th>\n<th>sno(fk)<\/th>\n<th>tno(fk)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1<\/td>\n<td>1<\/td>\n<td>3<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>1<\/td>\n<td>1<\/td>\n<\/tr>\n<tr>\n<td>3<\/td>\n<td>2<\/td>\n<td>2<\/td>\n<\/tr>\n<tr>\n<td>4<\/td>\n<td>2<\/td>\n<td>3<\/td>\n<\/tr>\n<tr>\n<td>5<\/td>\n<td>3<\/td>\n<td>1<\/td>\n<\/tr>\n<tr>\n<td>6<\/td>\n<td>3<\/td>\n<td>3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u7b2c\u4e09\u8303\u5f0f\uff1a\u5efa\u7acb\u5728\u7b2c\u4e8c\u8303\u5f0f\u7684\u57fa\u7840\u4e4b\u4e0a\uff0c\u6240\u6709\u975e\u4e3b\u952e\u5b57\u6bb5\u76f4\u63a5\u4f9d\u8d56\u4e3b\u952e\uff0c\u4e0d\u80fd\u4ea7\u751f\u4f20\u9012\u4f9d\u8d56\u3002<\/p>\n<p><strong>\u80cc\u4f1a\uff1a\u4e00\u5bf9\u591a\uff1f\u4e24\u5f20\u8868\uff0c\u591a\u7684\u8868\u52a0\u5916\u952e\u3002<\/strong><\/p>\n<p><strong><em>\u73ed\u7ea7t_class<\/em><\/strong><\/p>\n<table>\n<thead>\n<tr>\n<th>cno(pk)<\/th>\n<th>cname<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1<\/td>\n<td>\u73ed\u7ea71<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>\u73ed\u7ea72<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong><em>\u5b66\u751ft_student<\/em><\/strong>|<\/p>\n<table>\n<thead>\n<tr>\n<th>sno(pk)<\/th>\n<th>sname<\/th>\n<th>classno(fk)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>101<\/td>\n<td>\u5f201<\/td>\n<td>1<\/td>\n<\/tr>\n<tr>\n<td>102<\/td>\n<td>\u5f202<\/td>\n<td>1<\/td>\n<\/tr>\n<tr>\n<td>103<\/td>\n<td>\u5f203<\/td>\n<td>2<\/td>\n<\/tr>\n<tr>\n<td>104<\/td>\n<td>\u5f204<\/td>\n<td>2<\/td>\n<\/tr>\n<tr>\n<td>105<\/td>\n<td>\u5f205<\/td>\n<td>2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u63d0\u9192\uff1a\u5728\u5b9e\u9645\u7684\u5f00\u53d1\u4e2d\uff0c\u4ee5\u6ee1\u8db3\u5ba2\u6237\u7684\u9700\u6c42\u4e3a\u4e3b\uff0c\u6709\u7684\u65f6\u5019\u4f1a\u62ff\u5197\u4f59\u6362\u6267\u884c\u901f\u5ea6\u3002<\/p>\n<h2>7.3\u3001\u4e00\u5bf9\u4e00\u600e\u4e48\u8bbe\u8ba1\uff1f<\/h2>\n<p><strong>\u4e00\u5bf9\u4e00\u8bbe\u8ba1\u6709\u4e24\u79cd\u65b9\u6848\uff1a\u4e3b\u952e\u5171\u4eab<\/strong><\/p>\n<p><strong>t_user_login  \u7528\u6237\u767b\u5f55\u8868<\/strong><\/p>\n<table>\n<thead>\n<tr>\n<th>id(pk)<\/th>\n<th>username           password<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1<\/td>\n<td>zs<\/td>\n<td>123<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>ls<\/td>\n<td>456<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>t_user_detail \u7528\u6237\u8be6\u7ec6\u4fe1\u606f\u8868<\/strong><\/p>\n<table>\n<thead>\n<tr>\n<th>id(pk+fk)<\/th>\n<th>realname<\/th>\n<th>tel         ....<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1<\/td>\n<td>\u5f20\u4e09<\/td>\n<td>1111111111<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>\u674e\u56db<\/td>\n<td>1111415621<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014<\/p>\n<p><strong>\u4e00\u5bf9\u4e00\u8bbe\u8ba1\u6709\u4e24\u79cd\u65b9\u6848\uff1a\u5916\u952e\u552f\u4e00\u3002<\/strong><\/p>\n<p><strong>t_user_login  \u7528\u6237\u767b\u5f55\u8868<\/strong><\/p>\n<table>\n<thead>\n<tr>\n<th>id(pk)<\/th>\n<th>username<\/th>\n<th>password<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1<\/td>\n<td>zs<\/td>\n<td>123<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>ls<\/td>\n<td>456<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>t_user_detail \u7528\u6237\u8be6\u7ec6\u4fe1\u606f\u8868<\/strong><\/p>\n<table>\n<thead>\n<tr>\n<th>id(pk)<\/th>\n<th>realname<\/th>\n<th>tel<\/th>\n<th>userid(fk+unique)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>1<\/td>\n<td>\u5f20\u4e09<\/td>\n<td>1111111111<\/td>\n<td>2<\/td>\n<\/tr>\n<tr>\n<td>2<\/td>\n<td>\u674e\u56db<\/td>\n<td>1111415621<\/td>\n<td>1<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p>1\u3001\u7ea6\u675f 1.1\u3001\u552f\u4e00\u6027\u7ea6\u675f\uff08unique\uff09 \u552f\u4e00\u7ea6\u675f\u4fee\u9970\u7684\u5b57\u6bb5\u5177\u6709\u552f\u4e00\u6027\uff0c\u4e0d\u80fd\u91cd\u590d\u3002\u4f46\u53ef\u4ee5\u4e3aNULL\u3002 eg.\u6848\u4f8b\uff1a\u7ed9\u67d0\u4e00\u5217\u6dfb\u52a0uni   \u2026 &#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0},"categories":[23],"tags":[24],"_links":{"self":[{"href":"\/index.php?rest_route=\/wp\/v2\/posts\/292"}],"collection":[{"href":"\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=292"}],"version-history":[{"count":1,"href":"\/index.php?rest_route=\/wp\/v2\/posts\/292\/revisions"}],"predecessor-version":[{"id":293,"href":"\/index.php?rest_route=\/wp\/v2\/posts\/292\/revisions\/293"}],"wp:attachment":[{"href":"\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=292"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=292"},{"taxonomy":"post_tag","embeddable":true,"href":"\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=292"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}