{"id":11410,"date":"2025-06-11T18:52:15","date_gmt":"2025-06-11T10:52:15","guid":{"rendered":"https:\/\/egonlin.com\/?p=11410"},"modified":"2025-06-12T16:22:50","modified_gmt":"2025-06-12T08:22:50","slug":"%e8%a1%a8%e5%ae%8c%e6%95%b4%e6%80%a7%e7%ba%a6%e6%9d%9f","status":"publish","type":"post","link":"https:\/\/egonlin.com\/?p=11410","title":{"rendered":"\u8868\u5b8c\u6574\u6027\u7ea6\u675f"},"content":{"rendered":"<h3>\u4e00 \u4ecb\u7ecd<\/h3>\n<p>\u7ea6\u675f\u6761\u4ef6\u4e0e\u6570\u636e\u7c7b\u578b\u7684\u5bbd\u5ea6\u4e00\u6837\uff0c\u90fd\u662f\u53ef\u9009\u53c2\u6570<\/p>\n<p>\u4f5c\u7528\uff1a\u7528\u4e8e\u4fdd\u8bc1\u6570\u636e\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027<br \/>\n\u4e3b\u8981\u5206\u4e3a\uff1a<\/p>\n<div class=\"cnblogs_code\">\n<pre>PRIMARY KEY (PK)    \u6807\u8bc6\u8be5\u5b57\u6bb5\u4e3a\u8be5\u8868\u7684\u4e3b\u952e\uff0c\u53ef\u4ee5\u552f\u4e00\u7684\u6807\u8bc6\u8bb0\u5f55\r\nFOREIGN KEY (FK)    \u6807\u8bc6\u8be5\u5b57\u6bb5\u4e3a\u8be5\u8868\u7684\u5916\u952e\r\nNOT NULL    \u6807\u8bc6\u8be5\u5b57\u6bb5\u4e0d\u80fd\u4e3a\u7a7a\r\nUNIQUE KEY (UK)    \u6807\u8bc6\u8be5\u5b57\u6bb5\u7684\u503c\u662f\u552f\u4e00\u7684\r\nAUTO_INCREMENT    \u6807\u8bc6\u8be5\u5b57\u6bb5\u7684\u503c\u81ea\u52a8\u589e\u957f\uff08\u6574\u6570\u7c7b\u578b\uff0c\u800c\u4e14\u4e3a\u4e3b\u952e\uff09\r\nDEFAULT    \u4e3a\u8be5\u5b57\u6bb5\u8bbe\u7f6e\u9ed8\u8ba4\u503c\r\n\r\nUNSIGNED \u65e0\u7b26\u53f7\r\nZEROFILL \u4f7f\u75280\u586b\u5145<\/pre>\n<\/div>\n<p>\u8bf4\u660e\uff1a<\/p>\n<div class=\"cnblogs_code\">\n<pre>1. \u662f\u5426\u5141\u8bb8\u4e3a\u7a7a\uff0c\u9ed8\u8ba4NULL\uff0c\u53ef\u8bbe\u7f6eNOT NULL\uff0c\u5b57\u6bb5\u4e0d\u5141\u8bb8\u4e3a\u7a7a\uff0c\u5fc5\u987b\u8d4b\u503c\r\n2. \u5b57\u6bb5\u662f\u5426\u6709\u9ed8\u8ba4\u503c\uff0c\u7f3a\u7701\u7684\u9ed8\u8ba4\u503c\u662fNULL\uff0c\u5982\u679c\u63d2\u5165\u8bb0\u5f55\u65f6\u4e0d\u7ed9\u5b57\u6bb5\u8d4b\u503c\uff0c\u6b64\u5b57\u6bb5\u4f7f\u7528\u9ed8\u8ba4\u503c\r\nsex enum('male','female') not null default 'male'\r\nage int unsigned NOT NULL default 20 \u5fc5\u987b\u4e3a\u6b63\u503c\uff08\u65e0\u7b26\u53f7\uff09 \u4e0d\u5141\u8bb8\u4e3a\u7a7a \u9ed8\u8ba4\u662f20\r\n3. \u662f\u5426\u662fkey\r\n\u4e3b\u952e primary key\r\n\u5916\u952e foreign key\r\n\u7d22\u5f15 (index,unique...)<\/pre>\n<\/div>\n<h3>\u4e8c not null\u4e0edefault<\/h3>\n<p>\u662f\u5426\u53ef\u7a7a\uff0cnull\u8868\u793a\u7a7a\uff0c\u975e\u5b57\u7b26\u4e32<br \/>\nnot null &#8211; \u4e0d\u53ef\u7a7a<br \/>\nnull &#8211; \u53ef\u7a7a<\/p>\n<p>\u9ed8\u8ba4\u503c\uff0c\u521b\u5efa\u5217\u65f6\u53ef\u4ee5\u6307\u5b9a\u9ed8\u8ba4\u503c\uff0c\u5f53\u63d2\u5165\u6570\u636e\u65f6\u5982\u679c\u672a\u4e3b\u52a8\u8bbe\u7f6e\uff0c\u5219\u81ea\u52a8\u6dfb\u52a0\u9ed8\u8ba4\u503c<br \/>\ncreate table tb1(<br \/>\nnid int not null defalut 2,<br \/>\nnum int not null<br \/>\n)<\/p>\n<p>\u9a8c\u8bc1<\/p>\n<div class=\"cnblogs_code\">\n<div id=\"cnblogs_code_open_c08939ba-fdd9-419c-a8db-913e7ba304b9\" class=\"cnblogs_code_hide\">\n<pre>==================not null====================\r\nmysql&gt; create table t1(id int); #id\u5b57\u6bb5\u9ed8\u8ba4\u53ef\u4ee5\u63d2\u5165\u7a7a\r\nmysql&gt; desc t1;\r\n+-------+---------+------+-----+---------+-------+\r\n| Field | Type    | Null | Key | Default | Extra |\r\n+-------+---------+------+-----+---------+-------+\r\n| id    | int(11) | YES  |     | NULL    |       |\r\n+-------+---------+------+-----+---------+-------+\r\nmysql&gt; insert into t1 values(); #\u53ef\u4ee5\u63d2\u5165\u7a7a\r\n\r\n\r\nmysql&gt; create table t2(id int not null); #\u8bbe\u7f6e\u5b57\u6bb5id\u4e0d\u4e3a\u7a7a\r\nmysql&gt; desc t2;\r\n+-------+---------+------+-----+---------+-------+\r\n| Field | Type    | Null | Key | Default | Extra |\r\n+-------+---------+------+-----+---------+-------+\r\n| id    | int(11) | NO   |     | NULL    |       |\r\n+-------+---------+------+-----+---------+-------+\r\nmysql&gt; insert into t2 values(); #\u4e0d\u80fd\u63d2\u5165\u7a7a\r\nERROR 1364 (HY000): Field 'id' doesn't have a default value\r\n\r\n\r\n\r\n==================default====================\r\n#\u8bbe\u7f6eid\u5b57\u6bb5\u6709\u9ed8\u8ba4\u503c\u540e\uff0c\u5219\u65e0\u8bbaid\u5b57\u6bb5\u662fnull\u8fd8\u662fnot null\uff0c\u90fd\u53ef\u4ee5\u63d2\u5165\u7a7a\uff0c\u63d2\u5165\u7a7a\u9ed8\u8ba4\u586b\u5165default\u6307\u5b9a\u7684\u9ed8\u8ba4\u503c\r\nmysql&gt; create table t3(id int default 1);\r\nmysql&gt; alter table t3 modify id int not null default 1;\r\n\r\n\r\n\r\n==================\u7efc\u5408\u7ec3\u4e60====================\r\nmysql&gt; create table student(\r\n    -&gt; name varchar(20) not null,\r\n    -&gt; age int(3) unsigned not null default 18,\r\n    -&gt; sex enum('male','female') default 'male',\r\n    -&gt; hobby set('play','study','read','music') default 'play,music'\r\n    -&gt; );\r\nmysql&gt; desc student;\r\n+-------+------------------------------------+------+-----+------------+-------+\r\n| Field | Type                               | Null | Key | Default    | Extra |\r\n+-------+------------------------------------+------+-----+------------+-------+\r\n| name  | varchar(20)                        | NO   |     | NULL       |       |\r\n| age   | int(3) unsigned                    | NO   |     | 18         |       |\r\n| sex   | enum('male','female')              | YES  |     | male       |       |\r\n| hobby | set('play','study','read','music') | YES  |     | play,music |       |\r\n+-------+------------------------------------+------+-----+------------+-------+\r\nmysql&gt; insert into student(name) values('egon');\r\nmysql&gt; select * from student;\r\n+------+-----+------+------------+\r\n| name | age | sex  | hobby      |\r\n+------+-----+------+------------+\r\n| egon |  18 | male | play,music |\r\n+------+-----+------+------------+<\/pre>\n<\/div>\n<\/div>\n<h3>\u4e09 unique<button class=\"cnblogs-toc-button\" title=\"\u663e\u793a\u76ee\u5f55\u5bfc\u822a\" aria-expanded=\"false\"><\/button><\/h3>\n<pre>============\u8bbe\u7f6e\u552f\u4e00\u7ea6\u675f UNIQUE===============\r\n\u65b9\u6cd5\u4e00\uff1a\r\ncreate table department1(\r\nid int,\r\nname varchar(20) unique,\r\ncomment varchar(100)\r\n);\r\n\r\n\r\n\u65b9\u6cd5\u4e8c\uff1a\r\ncreate table department2(\r\nid int,\r\nname varchar(20),\r\ncomment varchar(100),\r\nconstraint uk_name unique(name)\r\n);\r\n\r\n\r\nmysql&gt; insert into department1 values(1,'IT','\u6280\u672f');\r\nQuery OK, 1 row affected (0.00 sec)\r\nmysql&gt; insert into department1 values(1,'IT','\u6280\u672f');\r\nERROR 1062 (23000): Duplicate entry 'IT' for key 'name'<\/pre>\n<p>not null+unique\u7684\u5316\u5b66\u53cd\u5e94<button class=\"cnblogs-toc-button\" title=\"\u663e\u793a\u76ee\u5f55\u5bfc\u822a\" aria-expanded=\"false\"><\/button><\/p>\n<pre>mysql&gt; create table t1(id int not null unique);\r\nQuery OK, 0 rows affected (0.02 sec)\r\n\r\nmysql&gt; desc t1;\r\n+-------+---------+------+-----+---------+-------+\r\n| Field | Type    | Null | Key | Default | Extra |\r\n+-------+---------+------+-----+---------+-------+\r\n| id    | int(11) | NO   | PRI | NULL    |       |\r\n+-------+---------+------+-----+---------+-------+\r\n1 row in set (0.00 sec)<\/pre>\n<p>\u8054\u5408\u552f\u4e00<button class=\"cnblogs-toc-button\" title=\"\u663e\u793a\u76ee\u5f55\u5bfc\u822a\" aria-expanded=\"false\"><\/button><\/p>\n<div class=\"cnblogs_code\">\n<div id=\"cnblogs_code_open_d0361821-89fc-4192-90c5-65ac5f1a4cc3\" class=\"cnblogs_code_hide\">\n<pre>create table service(\r\nid int primary key auto_increment,\r\nname varchar(20),\r\nhost varchar(15) not null,\r\nport int not null,\r\nunique(host,port) #\u8054\u5408\u552f\u4e00\r\n);\r\n\r\nmysql&gt; insert into service values\r\n    -&gt; (1,'nginx','192.168.0.10',80),\r\n    -&gt; (2,'haproxy','192.168.0.20',80),\r\n    -&gt; (3,'mysql','192.168.0.30',3306)\r\n    -&gt; ;\r\nQuery OK, 3 rows affected (0.01 sec)\r\nRecords: 3  Duplicates: 0  Warnings: 0\r\n\r\nmysql&gt; insert into service(name,host,port) values('nginx','192.168.0.10',80);\r\nERROR 1062 (23000): Duplicate entry '192.168.0.10-80' for key 'host'<\/pre>\n<\/div>\n<\/div>\n<h3>\u56db primary key<\/h3>\n<p>\u4ece\u7ea6\u675f\u89d2\u5ea6\u770bprimary key\u5b57\u6bb5\u7684\u503c\u4e0d\u4e3a\u7a7a\u4e14\u552f\u4e00\uff0c\u90a3\u6211\u4eec\u76f4\u63a5\u4f7f\u7528not null+unique\u4e0d\u5c31\u53ef\u4ee5\u4e86\u5417\uff0c\u8981\u5b83\u5e72\u4ec0\u4e48\uff1f<\/p>\n<p>\u4e3b\u952eprimary key\u662finnodb\u5b58\u50a8\u5f15\u64ce\u7ec4\u7ec7\u6570\u636e\u7684\u4f9d\u636e\uff0cinnodb\u79f0\u4e4b\u4e3a\u7d22\u5f15\u7ec4\u7ec7\u8868\uff0c\u4e00\u5f20\u8868\u4e2d\u5fc5\u987b\u6709\u4e14\u53ea\u6709\u4e00\u4e2a\u4e3b\u952e\u3002<\/p>\n<p>\u4e00\u4e2a\u8868\u4e2d\u53ef\u4ee5\uff1a<\/p>\n<p>\u5355\u5217\u505a\u4e3b\u952e<br \/>\n\u591a\u5217\u505a\u4e3b\u952e\uff08\u590d\u5408\u4e3b\u952e\uff09<\/p>\n<p>\u5355\u5217\u4e3b\u952e<\/p>\n<pre>============\u5355\u5217\u505a\u4e3b\u952e===============\r\n#\u65b9\u6cd5\u4e00\uff1anot null+unique\r\ncreate table department1(\r\nid int not null unique, #\u4e3b\u952e\r\nname varchar(20) not null unique,\r\ncomment varchar(100)\r\n);\r\n\r\nmysql&gt; desc department1;\r\n+---------+--------------+------+-----+---------+-------+\r\n| Field   | Type         | Null | Key | Default | Extra |\r\n+---------+--------------+------+-----+---------+-------+\r\n| id      | int(11)      | NO   | PRI | NULL    |       |\r\n| name    | varchar(20)  | NO   | UNI | NULL    |       |\r\n| comment | varchar(100) | YES  |     | NULL    |       |\r\n+---------+--------------+------+-----+---------+-------+\r\nrows in set (0.01 sec)\r\n\r\n#\u65b9\u6cd5\u4e8c\uff1a\u5728\u67d0\u4e00\u4e2a\u5b57\u6bb5\u540e\u7528primary key\r\ncreate table department2(\r\nid int primary key, #\u4e3b\u952e\r\nname varchar(20),\r\ncomment varchar(100)\r\n);\r\n\r\nmysql&gt; desc department2;\r\n+---------+--------------+------+-----+---------+-------+\r\n| Field   | Type         | Null | Key | Default | Extra |\r\n+---------+--------------+------+-----+---------+-------+\r\n| id      | int(11)      | NO   | PRI | NULL    |       |\r\n| name    | varchar(20)  | YES  |     | NULL    |       |\r\n| comment | varchar(100) | YES  |     | NULL    |       |\r\n+---------+--------------+------+-----+---------+-------+\r\nrows in set (0.00 sec)\r\n\r\n#\u65b9\u6cd5\u4e09\uff1a\u5728\u6240\u6709\u5b57\u6bb5\u540e\u5355\u72ec\u5b9a\u4e49primary key\r\ncreate table department3(\r\nid int,\r\nname varchar(20),\r\ncomment varchar(100),\r\nconstraint pk_name primary key(id); #\u521b\u5efa\u4e3b\u952e\u5e76\u4e3a\u5176\u547d\u540dpk_name\r\n\r\nmysql&gt; desc department3;\r\n+---------+--------------+------+-----+---------+-------+\r\n| Field   | Type         | Null | Key | Default | Extra |\r\n+---------+--------------+------+-----+---------+-------+\r\n| id      | int(11)      | NO   | PRI | NULL    |       |\r\n| name    | varchar(20)  | YES  |     | NULL    |       |\r\n| comment | varchar(100) | YES  |     | NULL    |       |\r\n+---------+--------------+------+-----+---------+-------+\r\nrows in set (0.01 sec)<\/pre>\n<p>\u591a\u5217\u4e3b\u952e<\/p>\n<pre>==================\u591a\u5217\u505a\u4e3b\u952e================\r\ncreate table service(\r\nip varchar(15),\r\nport char(5),\r\nservice_name varchar(10) not null,\r\nprimary key(ip,port)\r\n);\r\n\r\n\r\nmysql&gt; desc service;\r\n+--------------+-------------+------+-----+---------+-------+\r\n| Field        | Type        | Null | Key | Default | Extra |\r\n+--------------+-------------+------+-----+---------+-------+\r\n| ip           | varchar(15) | NO   | PRI | NULL    |       |\r\n| port         | char(5)     | NO   | PRI | NULL    |       |\r\n| service_name | varchar(10) | NO   |     | NULL    |       |\r\n+--------------+-------------+------+-----+---------+-------+\r\n3 rows in set (0.00 sec)\r\n\r\nmysql&gt; insert into service values\r\n    -&gt; ('172.16.45.10','3306','mysqld'),\r\n    -&gt; ('172.16.45.11','3306','mariadb')\r\n    -&gt; ;\r\nQuery OK, 2 rows affected (0.00 sec)\r\nRecords: 2  Duplicates: 0  Warnings: 0\r\n\r\nmysql&gt; insert into service values ('172.16.45.10','3306','nginx');\r\nERROR 1062 (23000): Duplicate entry '172.16.45.10-3306' for key 'PRIMARY'<\/pre>\n<h3>\u4e94 auto_increment<\/h3>\n<p>\u7ea6\u675f\u5b57\u6bb5\u4e3a\u81ea\u52a8\u589e\u957f\uff0c\u88ab\u7ea6\u675f\u7684\u5b57\u6bb5\u5fc5\u987b\u540c\u65f6\u88abkey\u7ea6\u675f<\/p>\n<div class=\"cnblogs_code\">\n<div id=\"cnblogs_code_open_38e86c0a-71ab-4b6e-a57d-5d7cd6611645\" class=\"cnblogs_code_hide\">\n<pre>#\u4e0d\u6307\u5b9aid\uff0c\u5219\u81ea\u52a8\u589e\u957f\r\ncreate table student(\r\nid int primary key auto_increment,\r\nname varchar(20),\r\nsex enum('male','female') default 'male'\r\n);\r\n\r\nmysql&gt; desc student;\r\n+-------+-----------------------+------+-----+---------+----------------+\r\n| Field | Type                  | Null | Key | Default | Extra          |\r\n+-------+-----------------------+------+-----+---------+----------------+\r\n| id    | int(11)               | NO   | PRI | NULL    | auto_increment |\r\n| name  | varchar(20)           | YES  |     | NULL    |                |\r\n| sex   | enum('male','female') | YES  |     | male    |                |\r\n+-------+-----------------------+------+-----+---------+----------------+\r\nmysql&gt; insert into student(name) values\r\n    -&gt; ('egon'),\r\n    -&gt; ('alex')\r\n    -&gt; ;\r\n\r\nmysql&gt; select * from student;\r\n+----+------+------+\r\n| id | name | sex  |\r\n+----+------+------+\r\n|  1 | egon | male |\r\n|  2 | alex | male |\r\n+----+------+------+\r\n\r\n\r\n#\u4e5f\u53ef\u4ee5\u6307\u5b9aid\r\nmysql&gt; insert into student values(4,'asb','female');\r\nQuery OK, 1 row affected (0.00 sec)\r\n\r\nmysql&gt; insert into student values(7,'wsb','female');\r\nQuery OK, 1 row affected (0.00 sec)\r\n\r\nmysql&gt; select * from student;\r\n+----+------+--------+\r\n| id | name | sex    |\r\n+----+------+--------+\r\n|  1 | egon | male   |\r\n|  2 | alex | male   |\r\n|  4 | asb  | female |\r\n|  7 | wsb  | female |\r\n+----+------+--------+\r\n\r\n\r\n#\u5bf9\u4e8e\u81ea\u589e\u7684\u5b57\u6bb5\uff0c\u5728\u7528delete\u5220\u9664\u540e\uff0c\u518d\u63d2\u5165\u503c\uff0c\u8be5\u5b57\u6bb5\u4ecd\u6309\u7167\u5220\u9664\u524d\u7684\u4f4d\u7f6e\u7ee7\u7eed\u589e\u957f\r\nmysql&gt; delete from student;\r\nQuery OK, 4 rows affected (0.00 sec)\r\n\r\nmysql&gt; select * from student;\r\nEmpty set (0.00 sec)\r\n\r\nmysql&gt; insert into student(name) values('ysb');\r\nmysql&gt; select * from student;\r\n+----+------+------+\r\n| id | name | sex  |\r\n+----+------+------+\r\n|  8 | ysb  | male |\r\n+----+------+------+\r\n\r\n#\u5e94\u8be5\u7528truncate\u6e05\u7a7a\u8868\uff0c\u6bd4\u8d77delete\u4e00\u6761\u4e00\u6761\u5730\u5220\u9664\u8bb0\u5f55\uff0ctruncate\u662f\u76f4\u63a5\u6e05\u7a7a\u8868\uff0c\u5728\u5220\u9664\u5927\u8868\u65f6\u7528\u5b83\r\nmysql&gt; truncate student;\r\nQuery OK, 0 rows affected (0.01 sec)\r\n\r\nmysql&gt; insert into student(name) values('egon');\r\nQuery OK, 1 row affected (0.01 sec)\r\n\r\nmysql&gt; select * from student;\r\n+----+------+------+\r\n| id | name | sex  |\r\n+----+------+------+\r\n|  1 | egon | male |\r\n+----+------+------+\r\n1 row in set (0.00 sec)<\/pre>\n<\/div>\n<\/div>\n<p>\u4e86\u89e3\u77e5\u8bc6<\/p>\n<p>\u6b65\u957f:auto_increment_increment,\u8d77\u59cb\u504f\u79fb\u91cf:auto_increment_offset<\/p>\n<pre>#\u5728\u521b\u5efa\u5b8c\u8868\u540e\uff0c\u4fee\u6539\u81ea\u589e\u5b57\u6bb5\u7684\u8d77\u59cb\u503c\r\nmysql&gt; create table student(\r\n    -&gt; id int primary key auto_increment,\r\n    -&gt; name varchar(20),\r\n    -&gt; sex enum('male','female') default 'male'\r\n    -&gt; );\r\n\r\nmysql&gt; alter table student auto_increment=3;\r\n\r\nmysql&gt; show create table student;\r\n.......\r\nENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8\r\n\r\nmysql&gt; insert into student(name) values('egon');\r\nQuery OK, 1 row affected (0.01 sec)\r\n\r\nmysql&gt; select * from student;\r\n+----+------+------+\r\n| id | name | sex  |\r\n+----+------+------+\r\n|  3 | egon | male |\r\n+----+------+------+\r\nrow in set (0.00 sec)\r\n\r\nmysql&gt; show create table student;\r\n.......\r\nENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8\r\n\r\n\r\n#\u4e5f\u53ef\u4ee5\u521b\u5efa\u8868\u65f6\u6307\u5b9aauto_increment\u7684\u521d\u59cb\u503c\uff0c\u6ce8\u610f\u521d\u59cb\u503c\u7684\u8bbe\u7f6e\u4e3a\u8868\u9009\u9879\uff0c\u5e94\u8be5\u653e\u5230\u62ec\u53f7\u5916\r\ncreate table student(\r\nid int primary key auto_increment,\r\nname varchar(20),\r\nsex enum('male','female') default 'male'\r\n)auto_increment=3;\r\n\r\n\r\n\r\n\r\n#\u8bbe\u7f6e\u6b65\u957f\r\nsqlserver\uff1a\u81ea\u589e\u6b65\u957f\r\n    \u57fa\u4e8e\u8868\u7ea7\u522b\r\n    create table t1\uff08\r\n        id int\u3002\u3002\u3002\r\n    \uff09engine=innodb,auto_increment=2 \u6b65\u957f=2 default charset=utf8\r\n\r\nmysql\u81ea\u589e\u7684\u6b65\u957f\uff1a\r\n    show session variables like 'auto_inc%';\r\n    \r\n    #\u57fa\u4e8e\u4f1a\u8bdd\u7ea7\u522b\r\n    set session auth_increment_increment=2 #\u4fee\u6539\u4f1a\u8bdd\u7ea7\u522b\u7684\u6b65\u957f\r\n\r\n    #\u57fa\u4e8e\u5168\u5c40\u7ea7\u522b\u7684\r\n    set global auth_increment_increment=2 #\u4fee\u6539\u5168\u5c40\u7ea7\u522b\u7684\u6b65\u957f\uff08\u6240\u6709\u4f1a\u8bdd\u90fd\u751f\u6548\uff09\r\n\r\n\r\n#\uff01\uff01\uff01\u6ce8\u610f\u4e86\u6ce8\u610f\u4e86\u6ce8\u610f\u4e86\uff01\uff01\uff01\r\nIf the value of auto_increment_offset is greater than that of auto_increment_increment, the value of auto_increment_offset is ignored. \r\n\u7ffb\u8bd1\uff1a\u5982\u679cauto_increment_offset\u7684\u503c\u5927\u4e8eauto_increment_increment\u7684\u503c\uff0c\u5219auto_increment_offset\u7684\u503c\u4f1a\u88ab\u5ffd\u7565 \uff0c\u8fd9\u76f8\u5f53\u4e8e\u7b2c\u4e00\u6b65\u6b65\u5b50\u5c31\u8fc8\u5927\u4e86\uff0c\u626f\u7740\u4e86\u86cb\r\n\u6bd4\u5982\uff1a\u8bbe\u7f6eauto_increment_offset=3\uff0cauto_increment_increment=2\r\n\r\n\r\n\r\n\r\nmysql&gt; set global auto_increment_increment=5;\r\nQuery OK, 0 rows affected (0.00 sec)\r\n\r\nmysql&gt; set global auto_increment_offset=3;\r\nQuery OK, 0 rows affected (0.00 sec)\r\n\r\nmysql&gt; show variables like 'auto_incre%'; #\u9700\u8981\u9000\u51fa\u91cd\u65b0\u767b\u5f55\r\n+--------------------------+-------+\r\n| Variable_name            | Value |\r\n+--------------------------+-------+\r\n| auto_increment_increment | 1     |\r\n| auto_increment_offset    | 1     |\r\n+--------------------------+-------+\r\n\r\n\r\n\r\ncreate table student(\r\nid int primary key auto_increment,\r\nname varchar(20),\r\nsex enum('male','female') default 'male'\r\n);\r\n\r\nmysql&gt; insert into student(name) values('egon1'),('egon2'),('egon3');\r\nmysql&gt; select * from student;\r\n+----+-------+------+\r\n| id | name  | sex  |\r\n+----+-------+------+\r\n|  3 | egon1 | male |\r\n|  8 | egon2 | male |\r\n| 13 | egon3 | male |\r\n+----+-------+------+<\/pre>\n<h3>\u516d foreign key<\/h3>\n<p><strong>\u4e00 \u5feb\u901f\u7406\u89e3foreign key<\/strong><\/p>\n<p>\u5458\u5de5\u4fe1\u606f\u8868\u6709\u4e09\u4e2a\u5b57\u6bb5\uff1a\u5de5\u53f7 \u00a0\u59d3\u540d \u00a0\u90e8\u95e8<\/p>\n<p>\u516c\u53f8\u67093\u4e2a\u90e8\u95e8\uff0c\u4f46\u662f\u67091\u4e2a\u4ebf\u7684\u5458\u5de5\uff0c\u90a3\u610f\u5473\u7740\u90e8\u95e8\u8fd9\u4e2a\u5b57\u6bb5\u9700\u8981\u91cd\u590d\u5b58\u50a8\uff0c\u90e8\u95e8\u540d\u5b57\u8d8a\u957f\uff0c\u8d8a\u6d6a\u8d39<\/p>\n<p>\u89e3\u51b3\u65b9\u6cd5\uff1a<\/p>\n<p>\u6211\u4eec\u5b8c\u5168\u53ef\u4ee5\u5b9a\u4e49\u4e00\u4e2a\u90e8\u95e8\u8868<\/p>\n<p>\u7136\u540e\u8ba9\u5458\u5de5\u4fe1\u606f\u8868\u5173\u8054\u8be5\u8868\uff0c\u5982\u4f55\u5173\u8054\uff0c\u5373foreign key<\/p>\n<p><strong>\u6ce8\u610f\uff1a\u88ab\u5173\u8054\u5b57\u6bb5\u5fc5\u987b\u662f\u552f\u4e00\u7684\uff0c\u88ab\u5173\u8054\u5b57\u6bb5\u53ef\u4ee5\u4f7funique key\u6216\u8005primary key<\/strong><\/p>\n<div class=\"cnblogs_code\">\n<div id=\"cnblogs_code_open_f294b1f0-e1ab-40dc-89c9-2a9a675dac0b\" class=\"cnblogs_code_hide\">\n<pre>#\u8868\u7c7b\u578b\u5fc5\u987b\u662finnodb\u5b58\u50a8\u5f15\u64ce\uff0c\u4e14\u88ab\u5173\u8054\u7684\u5b57\u6bb5\uff0c\u5373references\u6307\u5b9a\u7684\u53e6\u5916\u4e00\u4e2a\u8868\u7684\u5b57\u6bb5\uff0c\u5fc5\u987b\u4fdd\u8bc1\u552f\u4e00\r\ncreate table department(\r\nid int primary key,\r\nname varchar(20) not null\r\n)engine=innodb;\r\n\r\n#dpt_id\u5916\u952e\uff0c\u5173\u8054\u7236\u8868\uff08department\u4e3b\u952eid\uff09\uff0c\u540c\u6b65\u66f4\u65b0\uff0c\u540c\u6b65\u5220\u9664\r\ncreate table employee(\r\nid int primary key,\r\nname varchar(20) not null,\r\ndpt_id int,\r\nconstraint fk_name foreign key(dpt_id)\r\nreferences department(id)\r\non delete cascade\r\non update cascade \r\n)engine=innodb;\r\n\r\n\r\n#\u5148\u5f80\u7236\u8868department\u4e2d\u63d2\u5165\u8bb0\u5f55\r\ninsert into department values\r\n(1,'\u6b27\u5fb7\u535a\u7231\u6280\u672f\u6709\u9650\u4e8b\u4e1a\u90e8'),\r\n(2,'\u827e\u5229\u514b\u65af\u4eba\u529b\u8d44\u6e90\u90e8'),\r\n(3,'\u9500\u552e\u90e8');\r\n\r\n\r\n#\u518d\u5f80\u5b50\u8868employee\u4e2d\u63d2\u5165\u8bb0\u5f55\r\ninsert into employee values\r\n(1,'egon',1),\r\n(2,'alex1',2),\r\n(3,'alex2',2),\r\n(4,'alex3',2),\r\n(5,'\u674e\u5766\u514b',3),\r\n(6,'\u5218\u98de\u673a',3),\r\n(7,'\u5f20\u706b\u7bad',3),\r\n(8,'\u6797\u5b50\u5f39',3),\r\n(9,'\u52a0\u7279\u6797',3)\r\n;\r\n\r\n\r\n#\u5220\u7236\u8868department\uff0c\u5b50\u8868employee\u4e2d\u5bf9\u5e94\u7684\u8bb0\u5f55\u8ddf\u7740\u5220\r\nmysql&gt; delete from department where id=3;\r\nmysql&gt; select * from employee;\r\n+----+-------+--------+\r\n| id | name  | dpt_id |\r\n+----+-------+--------+\r\n|  1 | egon  |      1 |\r\n|  2 | alex1 |      2 |\r\n|  3 | alex2 |      2 |\r\n|  4 | alex3 |      2 |\r\n+----+-------+--------+\r\n\r\n\r\n#\u66f4\u65b0\u7236\u8868department\uff0c\u5b50\u8868employee\u4e2d\u5bf9\u5e94\u7684\u8bb0\u5f55\u8ddf\u7740\u6539\r\nmysql&gt; update department set id=22222 where id=2;\r\nmysql&gt; select * from employee;\r\n+----+-------+--------+\r\n| id | name  | dpt_id |\r\n+----+-------+--------+\r\n|  1 | egon  |      1 |\r\n|  3 | alex2 |  22222 |\r\n|  4 | alex3 |  22222 |\r\n|  5 | alex1 |  22222 |\r\n+----+-------+--------+<\/pre>\n<\/div>\n<\/div>\n<p><strong>\u4e8c\u00a0\u5982\u4f55\u627e\u51fa\u4e24\u5f20\u8868\u4e4b\u95f4\u7684\u5173\u7cfb\u00a0<\/strong><\/p>\n<pre>\u793a\u4f8b<\/pre>\n<pre>\u5206\u6790\u6b65\u9aa4\uff1a\r\n#1\u3001\u5148\u7ad9\u5728\u5de6\u8868\u7684\u89d2\u5ea6\u53bb\u627e\r\n\u662f\u5426\u5de6\u8868\u7684\u591a\u6761\u8bb0\u5f55\u53ef\u4ee5\u5bf9\u5e94\u53f3\u8868\u7684\u4e00\u6761\u8bb0\u5f55\uff0c\u5982\u679c\u662f\uff0c\u5219\u8bc1\u660e\u5de6\u8868\u7684\u4e00\u4e2a\u5b57\u6bb5foreign key \u53f3\u8868\u4e00\u4e2a\u5b57\u6bb5\uff08\u901a\u5e38\u662fid\uff09\r\n\r\n#2\u3001\u518d\u7ad9\u5728\u53f3\u8868\u7684\u89d2\u5ea6\u53bb\u627e\r\n\u662f\u5426\u53f3\u8868\u7684\u591a\u6761\u8bb0\u5f55\u53ef\u4ee5\u5bf9\u5e94\u5de6\u8868\u7684\u4e00\u6761\u8bb0\u5f55\uff0c\u5982\u679c\u662f\uff0c\u5219\u8bc1\u660e\u53f3\u8868\u7684\u4e00\u4e2a\u5b57\u6bb5foreign key \u5de6\u8868\u4e00\u4e2a\u5b57\u6bb5\uff08\u901a\u5e38\u662fid\uff09\r\n\r\n#3\u3001\u603b\u7ed3\uff1a\r\n#\u591a\u5bf9\u4e00\uff1a\r\n\u5982\u679c\u53ea\u6709\u6b65\u9aa41\u6210\u7acb\uff0c\u5219\u662f\u5de6\u8868\u591a\u5bf9\u4e00\u53f3\u8868\r\n\u5982\u679c\u53ea\u6709\u6b65\u9aa42\u6210\u7acb\uff0c\u5219\u662f\u53f3\u8868\u591a\u5bf9\u4e00\u5de6\u8868\r\n\r\n#\u591a\u5bf9\u591a\r\n\u5982\u679c\u6b65\u9aa41\u548c2\u540c\u65f6\u6210\u7acb\uff0c\u5219\u8bc1\u660e\u8fd9\u4e24\u5f20\u8868\u65f6\u4e00\u4e2a\u53cc\u5411\u7684\u591a\u5bf9\u4e00\uff0c\u5373\u591a\u5bf9\u591a,\u9700\u8981\u5b9a\u4e49\u4e00\u4e2a\u8fd9\u4e24\u5f20\u8868\u7684\u5173\u7cfb\u8868\u6765\u4e13\u95e8\u5b58\u653e\u4e8c\u8005\u7684\u5173\u7cfb\r\n\r\n#\u4e00\u5bf9\u4e00:\r\n\u5982\u679c1\u548c2\u90fd\u4e0d\u6210\u7acb\uff0c\u800c\u662f\u5de6\u8868\u7684\u4e00\u6761\u8bb0\u5f55\u552f\u4e00\u5bf9\u5e94\u53f3\u8868\u7684\u4e00\u6761\u8bb0\u5f55\uff0c\u53cd\u4e4b\u4ea6\u7136\u3002\u8fd9\u79cd\u60c5\u51b5\u5f88\u7b80\u5355\uff0c\u5c31\u662f\u5728\u5de6\u8868foreign key\u53f3\u8868\u7684\u57fa\u7840\u4e0a\uff0c\u5c06\u5de6\u8868\u7684\u5916\u952e\u5b57\u6bb5\u8bbe\u7f6e\u6210unique\u5373\u53ef\r\n\r\n<\/pre>\n<p><strong>\u4e09 \u5efa\u7acb\u8868\u4e4b\u95f4\u7684\u5173\u7cfb<\/strong><\/p>\n<div class=\"cnblogs_code\">\n<pre>#\u4e00\u5bf9\u591a\u6216\u79f0\u4e3a\u591a\u5bf9\u4e00\r\n\u4e09\u5f20\u8868\uff1a\u51fa\u7248\u793e\uff0c\u4f5c\u8005\u4fe1\u606f\uff0c\u4e66\r\n\r\n\u4e00\u5bf9\u591a\uff08\u6216\u591a\u5bf9\u4e00\uff09\uff1a\u4e00\u4e2a\u51fa\u7248\u793e\u53ef\u4ee5\u51fa\u7248\u591a\u672c\u4e66\r\n\r\n\u5173\u8054\u65b9\u5f0f\uff1aforeign key\r\n\r\n<\/pre>\n<\/div>\n<div class=\"cnblogs_code\">\n<div id=\"cnblogs_code_open_e517824e-89ee-4338-8885-5615baef37d1\" class=\"cnblogs_code_hide\">\n<pre>=====================\u591a\u5bf9\u4e00=====================\r\ncreate table press(\r\nid int primary key auto_increment,\r\nname varchar(20)\r\n);\r\n\r\ncreate table book(\r\nid int primary key auto_increment,\r\nname varchar(20),\r\npress_id int not null,\r\nforeign key(press_id) references press(id)\r\non delete cascade\r\non update cascade\r\n);\r\n\r\n\r\ninsert into press(name) values\r\n('\u5317\u4eac\u5de5\u4e1a\u5730\u96f7\u51fa\u7248\u793e'),\r\n('\u4eba\u6c11\u97f3\u4e50\u4e0d\u597d\u542c\u51fa\u7248\u793e'),\r\n('\u77e5\u8bc6\u4ea7\u6743\u6ca1\u6709\u7528\u51fa\u7248\u793e')\r\n;\r\n\r\ninsert into book(name,press_id) values\r\n('\u4e5d\u9633\u795e\u529f',1),\r\n('\u4e5d\u9634\u771f\u7ecf',2),\r\n('\u4e5d\u9634\u767d\u9aa8\u722a',2),\r\n('\u72ec\u5b64\u4e5d\u5251',3),\r\n('\u964d\u9f99\u5341\u5df4\u638c',2),\r\n('\u8475\u82b1\u5b9d\u5178',3)\r\n;\r\n\r\n<\/pre>\n<\/div>\n<\/div>\n<pre>\u5176\u4ed6\u4f8b\u5b50<\/pre>\n<pre>\u4e00\u592b\u591a\u59bb\u5236\r\n\r\n#\u59bb\u5b50\u8868\u7684\u4e08\u592bid\u5916\u952e\u5230\u4e08\u592b\u8868\u7684id\r\n\r\n\r\n<\/pre>\n<pre>#\u591a\u5bf9\u591a\r\n\u4e09\u5f20\u8868\uff1a\u51fa\u7248\u793e\uff0c\u4f5c\u8005\u4fe1\u606f\uff0c\u4e66\r\n\r\n\u591a\u5bf9\u591a\uff1a\u4e00\u4e2a\u4f5c\u8005\u53ef\u4ee5\u5199\u591a\u672c\u4e66\uff0c\u4e00\u672c\u4e66\u4e5f\u53ef\u4ee5\u6709\u591a\u4e2a\u4f5c\u8005\uff0c\u53cc\u5411\u7684\u4e00\u5bf9\u591a\uff0c\u5373\u591a\u5bf9\u591a\r\n\u3000\u3000\r\n\u5173\u8054\u65b9\u5f0f\uff1aforeign key+\u4e00\u5f20\u65b0\u7684\u8868\r\n\r\n\r\n<\/pre>\n<pre>=====================\u591a\u5bf9\u591a=====================\r\ncreate table author(\r\nid int primary key auto_increment,\r\nname varchar(20)\r\n);\r\n\r\n\r\n#\u8fd9\u5f20\u8868\u5c31\u5b58\u653e\u4f5c\u8005\u8868\u4e0e\u4e66\u8868\u7684\u5173\u7cfb\uff0c\u5373\u67e5\u8be2\u4e8c\u8005\u7684\u5173\u7cfb\u67e5\u8fd9\u8868\u5c31\u53ef\u4ee5\u4e86\r\ncreate table author2book(\r\nid int not null unique auto_increment,\r\nauthor_id int not null,\r\nbook_id int not null,\r\nconstraint fk_author foreign key(author_id) references author(id)\r\non delete cascade\r\non update cascade,\r\nconstraint fk_book foreign key(book_id) references book(id)\r\non delete cascade\r\non update cascade,\r\nprimary key(author_id,book_id)\r\n);\r\n\r\n\r\n#\u63d2\u5165\u56db\u4e2a\u4f5c\u8005\uff0cid\u4f9d\u6b21\u6392\u5f00\r\ninsert into author(name) values('egon'),('alex'),('yuanhao'),('wpq');\r\n\r\n#\u6bcf\u4e2a\u4f5c\u8005\u4e0e\u81ea\u5df1\u7684\u4ee3\u8868\u4f5c\u5982\u4e0b\r\n1 egon: \r\n      1 \u4e5d\u9633\u795e\u529f\r\n      2 \u4e5d\u9634\u771f\u7ecf\r\n      3 \u4e5d\u9634\u767d\u9aa8\u722a\r\n      4 \u72ec\u5b64\u4e5d\u5251\r\n      5 \u964d\u9f99\u5341\u5df4\u638c\r\n      6 \u8475\u82b1\u5b9d\u5178\r\n\r\n\r\n2 alex: \r\n      1 \u4e5d\u9633\u795e\u529f\r\n      6 \u8475\u82b1\u5b9d\u5178\r\n\r\n3 yuanhao:\r\n      4 \u72ec\u5b64\u4e5d\u5251\r\n      5 \u964d\u9f99\u5341\u5df4\u638c\r\n      6 \u8475\u82b1\u5b9d\u5178\r\n\r\n4 wpq:\r\n      1 \u4e5d\u9633\u795e\u529f\r\n\r\n\r\ninsert into author2book(author_id,book_id) values\r\n(1,1),\r\n(1,2),\r\n(1,3),\r\n(1,4),\r\n(1,5),\r\n(1,6),\r\n(2,1),\r\n(2,6),\r\n(3,4),\r\n(3,5),\r\n(3,6),\r\n(4,1)\r\n;\r\n\r\n<\/pre>\n<div class=\"cnblogs_code_toolbar\">\u5176\u4ed6\u4f8b\u5b50<\/div>\n<div>\n<pre>\u5355\u5f20\u8868\uff1a\u7528\u6237\u8868+\u76f8\u4eb2\u5173\u7cfb\u8868\uff0c\u76f8\u5f53\u4e8e\uff1a\u7528\u6237\u8868+\u76f8\u4eb2\u5173\u7cfb\u8868+\u7528\u6237\u8868\r\n\u591a\u5f20\u8868\uff1a\u7528\u6237\u8868+\u7528\u6237\u4e0e\u4e3b\u673a\u5173\u7cfb\u8868+\u4e3b\u673a\u8868\r\n\r\n\u4e2d\u95f4\u90a3\u4e00\u5f20\u5b58\u653e\u5173\u7cfb\u7684\u8868\uff0c\u5bf9\u5916\u5173\u8054\u7684\u5b57\u6bb5\u53ef\u4ee5\u8054\u5408\u552f\u4e00\r\n\r\n\r\n\r\n<\/pre>\n<pre>#\u4e00\u5bf9\u4e00\r\n\u4e24\u5f20\u8868\uff1a\u5b66\u751f\u8868\u548c\u5ba2\u6237\u8868\r\n\r\n\u4e00\u5bf9\u4e00\uff1a\u4e00\u4e2a\u5b66\u751f\u662f\u4e00\u4e2a\u5ba2\u6237\uff0c\u4e00\u4e2a\u5ba2\u6237\u6709\u53ef\u80fd\u53d8\u6210\u4e00\u4e2a\u5b66\u6821\uff0c\u5373\u4e00\u5bf9\u4e00\u7684\u5173\u7cfb\r\n\r\n\u5173\u8054\u65b9\u5f0f\uff1aforeign key+unique\r\n\r\n\r\n<\/pre>\n<pre>#\u4e00\u5b9a\u662fstudent\u6765foreign key\u8868customer\uff0c\u8fd9\u6837\u5c31\u4fdd\u8bc1\u4e86\uff1a\r\n#1 \u5b66\u751f\u4e00\u5b9a\u662f\u4e00\u4e2a\u5ba2\u6237\uff0c\r\n#2 \u5ba2\u6237\u4e0d\u4e00\u5b9a\u662f\u5b66\u751f\uff0c\u4f46\u6709\u53ef\u80fd\u6210\u4e3a\u4e00\u4e2a\u5b66\u751f\r\n\r\n\r\ncreate table customer(\r\nid int primary key auto_increment,\r\nname varchar(20) not null,\r\nqq varchar(10) not null,\r\nphone char(16) not null\r\n);\r\n\r\n\r\ncreate table student(\r\nid int primary key auto_increment,\r\nclass_name varchar(20) not null,\r\ncustomer_id int unique, #\u8be5\u5b57\u6bb5\u4e00\u5b9a\u8981\u662f\u552f\u4e00\u7684\r\nforeign key(customer_id) references customer(id) #\u5916\u952e\u7684\u5b57\u6bb5\u4e00\u5b9a\u8981\u4fdd\u8bc1unique\r\non delete cascade\r\non update cascade\r\n);\r\n\r\n\r\n#\u589e\u52a0\u5ba2\u6237\r\ninsert into customer(name,qq,phone) values\r\n('\u674e\u98de\u673a','31811231',13811341220),\r\n('\u738b\u5927\u70ae','123123123',15213146809),\r\n('\u5b88\u69b4\u5f39','283818181',1867141331),\r\n('\u5434\u5766\u514b','283818181',1851143312),\r\n('\u8d62\u706b\u7bad','888818181',1861243314),\r\n('\u6218\u5730\u96f7','112312312',18811431230)\r\n;\r\n\r\n\r\n#\u589e\u52a0\u5b66\u751f\r\ninsert into student(class_name,customer_id) values\r\n('\u8131\u4ea73\u73ed',3),\r\n('\u5468\u672b19\u671f',4),\r\n('\u5468\u672b19\u671f',5)\r\n;\r\n\r\n\u5176\u4ed6\u4f8b\u5b50<\/pre>\n<pre>\u4f8b\u4e00\uff1a\u4e00\u4e2a\u7528\u6237\u53ea\u6709\u4e00\u4e2a\u535a\u5ba2\r\n\r\n    \u7528\u6237\u8868\uff1a\r\n    id  name\r\n    1    egon\r\n    2    alex\r\n    3    wupeiqi\r\n\r\n\r\n    \u535a\u5ba2\u8868   \r\n           fk+unique\r\n    id url name_id\r\n    1  xxxx   1\r\n    2  yyyy   3\r\n    3  zzz    2\r\n\r\n\r\n\r\n\u4f8b\u4e8c\uff1a\u4e00\u4e2a\u7ba1\u7406\u5458\u552f\u4e00\u5bf9\u5e94\u4e00\u4e2a\u7528\u6237\r\n    \u7528\u6237\u8868\uff1a\r\n    id user  password\r\n    1  egon    xxxx\r\n    2  alex    yyyy\r\n\r\n    \u7ba1\u7406\u5458\u8868\uff1a\r\n       fk+unique\r\n    id user_id password\r\n    1   1      xxxxx\r\n    2   2      yyyyy\r\n\r\n<\/pre>\n<h3>\u4e03 \u4f5c\u4e1a<\/h3>\n<p>\u7ec3\u4e60\uff1a\u8d26\u53f7\u4fe1\u606f\u8868\uff0c\u7528\u6237\u7ec4\uff0c\u4e3b\u673a\u8868\uff0c\u4e3b\u673a\u7ec4<\/p>\n<div class=\"cnblogs_code\">\n<div id=\"cnblogs_code_open_d573a1a5-d4c5-4e50-8d00-95ed2d238f66\" class=\"cnblogs_code_hide\">\n<pre>#\u7528\u6237\u8868\r\ncreate table user(\r\nid int not null unique auto_increment,\r\nusername varchar(20) not null,\r\npassword varchar(50) not null,\r\nprimary key(username,password)\r\n);\r\n\r\ninsert into user(username,password) values\r\n('root','123'),\r\n('egon','456'),\r\n('alex','alex3714')\r\n;\r\n\r\n\r\n#\u7528\u6237\u7ec4\u8868\r\ncreate table usergroup(\r\nid int primary key auto_increment,\r\ngroupname varchar(20) not null unique\r\n);\r\n\r\ninsert into usergroup(groupname) values\r\n('IT'),\r\n('Sale'),\r\n('Finance'),\r\n('boss')\r\n;\r\n\r\n\r\n#\u4e3b\u673a\u8868\r\ncreate table host(\r\nid int primary key auto_increment,\r\nip char(15) not null unique default '127.0.0.1'\r\n);\r\n\r\ninsert into host(ip) values\r\n('172.16.45.2'),\r\n('172.16.31.10'),\r\n('172.16.45.3'),\r\n('172.16.31.11'),\r\n('172.10.45.3'),\r\n('172.10.45.4'),\r\n('172.10.45.5'),\r\n('192.168.1.20'),\r\n('192.168.1.21'),\r\n('192.168.1.22'),\r\n('192.168.2.23'),\r\n('192.168.2.223'),\r\n('192.168.2.24'),\r\n('192.168.3.22'),\r\n('192.168.3.23'),\r\n('192.168.3.24')\r\n;\r\n\r\n\r\n#\u4e1a\u52a1\u7ebf\u8868\r\ncreate table business(\r\nid int primary key auto_increment,\r\nbusiness varchar(20) not null unique\r\n);\r\ninsert into business(business) values\r\n('\u8f7b\u677e\u8d37'),\r\n('\u968f\u4fbf\u82b1'),\r\n('\u5927\u5bcc\u7fc1'),\r\n('\u7a77\u4e00\u751f')\r\n;\r\n\r\n\r\n#\u5efa\u5173\u7cfb\uff1auser\u4e0eusergroup\r\n\r\ncreate table user2usergroup(\r\nid int not null unique auto_increment,\r\nuser_id int not null,\r\ngroup_id int not null,\r\nprimary key(user_id,group_id),\r\nforeign key(user_id) references user(id),\r\nforeign key(group_id) references usergroup(id)\r\n);\r\n\r\ninsert into user2usergroup(user_id,group_id) values\r\n(1,1),\r\n(1,2),\r\n(1,3),\r\n(1,4),\r\n(2,3),\r\n(2,4),\r\n(3,4)\r\n;\r\n\r\n\r\n\r\n#\u5efa\u5173\u7cfb\uff1ahost\u4e0ebusiness\r\n\r\ncreate table host2business(\r\nid int not null unique auto_increment,\r\nhost_id int not null,\r\nbusiness_id int not null,\r\nprimary key(host_id,business_id),\r\nforeign key(host_id) references host(id),\r\nforeign key(business_id) references business(id)\r\n);\r\n\r\ninsert into host2business(host_id,business_id) values\r\n(1,1),\r\n(1,2),\r\n(1,3),\r\n(2,2),\r\n(2,3),\r\n(3,4)\r\n;\r\n\r\n#\u5efa\u5173\u7cfb\uff1auser\u4e0ehost\r\n\r\ncreate table user2host(\r\nid int not null unique auto_increment,\r\nuser_id int not null,\r\nhost_id int not null,\r\nprimary key(user_id,host_id),\r\nforeign key(user_id) references user(id),\r\nforeign key(host_id) references host(id)\r\n);\r\n\r\ninsert into user2host(user_id,host_id) values\r\n(1,1),\r\n(1,2),\r\n(1,3),\r\n(1,4),\r\n(1,5),\r\n(1,6),\r\n(1,7),\r\n(1,8),\r\n(1,9),\r\n(1,10),\r\n(1,11),\r\n(1,12),\r\n(1,13),\r\n(1,14),\r\n(1,15),\r\n(1,16),\r\n(2,2),\r\n(2,3),\r\n(2,4),\r\n(2,5),\r\n(3,10),\r\n(3,11),\r\n(3,12)\r\n;<\/pre>\n<\/div>\n<\/div>\n<h3>\u4f5c\u4e1a\uff1a<\/h3>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2025\/06\/1036857-20170906003405866-1307219644.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" class=\"alignnone size-full wp-image-11411\" data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2025\/06\/1036857-20170906003405866-1307219644.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" width=\"734\" height=\"493\" \/><\/div><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00 \u4ecb\u7ecd \u7ea6\u675f\u6761\u4ef6\u4e0e\u6570\u636e\u7c7b\u578b\u7684\u5bbd\u5ea6\u4e00\u6837\uff0c\u90fd\u662f\u53ef\u9009\u53c2\u6570 \u4f5c\u7528\uff1a\u7528\u4e8e\u4fdd\u8bc1\u6570\u636e\u7684\u5b8c\u6574\u6027\u548c\u4e00\u81f4\u6027 \u4e3b\u8981\u5206\u4e3a\uff1a PRIM [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/11410"}],"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=11410"}],"version-history":[{"count":2,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/11410\/revisions"}],"predecessor-version":[{"id":11413,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/11410\/revisions\/11413"}],"wp:attachment":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=11410"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=11410"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=11410"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}