mysql> CREATE DATABASE microservice_mallmanagement;
Query OK, 1 row affected (0.01 sec)
mysql> USE microservice_mallmanagement;
Database changed
mysql> DROP TABLE IF EXISTS `tb_order`;
Query OK, 0 rows affected, 1 warning (0.01 sec)
mysql> CREATE TABLE `tb_order` (
-> `id` int(11) NOT NULL AUTO_INCREMENT,
-> `createtime` datetime DEFAULT NULL,
-> `number` varchar(255) DEFAULT NULL,
-> `userid` int(11) DEFAULT NULL,
-> PRIMARY KEY (`id`)
-> ) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;
Query OK, 0 rows affected, 1 warning (0.11 sec)
mysql> INSERT INTO `tb_order` VALUES ('1', '2017-10-09 10:15:44', '201709181459001', '1');
Query OK, 1 row affected (0.01 sec)
mysql> INSERT INTO `tb_order` VALUES ('2', '2017-10-24 18:22:12', '201709181459008', '1');
Query OK, 1 row affected (0.01 sec)
mysql>
mysql>
mysql> DROP TABLE IF EXISTS `tb_user`;
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> CREATE TABLE `tb_user` (
-> `id` int(11) NOT NULL AUTO_INCREMENT,
-> `address` varchar(255) DEFAULT NULL,
-> `username` varchar(255) DEFAULT NULL,
-> PRIMARY KEY (`id`)
-> ) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
Query OK, 0 rows affected, 1 warning (0.03 sec)
mysql> INSERT INTO `tb_user` VALUES ('1', 'beijing', 'shitou');
Query OK, 1 row affected (0.01 sec)
mysql> show tables;
+---------------------------------------+
| Tables_in_microservice_mallmanagement |
+---------------------------------------+
| tb_order |
| tb_user |
+---------------------------------------+
2 rows in set (0.00 sec)
mysql> select * from tb_user;
+----+---------+----------+
| id | address | username |
+----+---------+----------+
| 1 | beijing | shitou |
+----+---------+----------+
1 row in set (0.00 sec)
mysql> select * from tb_order;
+----+---------------------+-----------------+--------+
| id | createtime | number | userid |
+----+---------------------+-----------------+--------+
| 1 | 2017-10-09 10:15:44 | 201709181459001 | 1 |
| 2 | 2017-10-24 18:22:12 | 201709181459008 | 1 |
+----+---------------------+-----------------+--------+
2 rows in set (0.00 sec)
mysql> create table user_info(user_id int primary key,user_name varchar(30),user_age int);
Query OK, 0 rows affected (0.06 sec)
mysql> create table relation_define(relation_id int primary key,relation_name varchar(32));
Query OK, 0 rows affected (0.12 sec)
mysql> create table user_relations(user_id int,relation_id int,user_rel_id int);
Query OK, 0 rows affected (0.12 sec)
mysql>
mysql> desc user_info;
+-----------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------+-------------+------+-----+---------+-------+
| user_id | int(11) | NO | PRI | NULL | |
| user_name | varchar(30) | YES | | NULL | |
| user_age | int(11) | YES | | NULL | |
+-----------+-------------+------+-----+---------+-------+
3 rows in set (0.02 sec)
mysql> insert into user_info values(1,'james',18),(2,'Rose',25),(3,'jack',50);
Query OK, 3 rows affected (0.11 sec)
Records: 3 Duplicates: 0 Warnings: 0
mysql> select * from user_info;
+---------+-----------+----------+
| user_id | user_name | user_age |
+---------+-----------+----------+
| 1 | james | 18 |
| 2 | Rose | 25 |
| 3 | jack | 50 |
+---------+-----------+----------+
3 rows in set (0.00 sec)
mysql> desc relation_define;
+---------------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+---------------+-------------+------+-----+---------+-------+
| relation_id | int(11) | NO | PRI | NULL | |
| relation_name | varchar(32) | YES | | NULL | |
+---------------+-------------+------+-----+---------+-------+
2 rows in set (0.00 sec)
mysql> insert into relation_define values(1,'同事'),(2,'父子'),(3,'朋友');
Query OK, 3 rows affected (0.08 sec)
Records: 3 Duplicates: 0 Warnings: 0
mysql> desc user_relations;
+-------------+---------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------------+---------+------+-----+---------+-------+
| user_id | int(11) | YES | | NULL | |
| relation_id | int(11) | YES | | NULL | |
mysql> select user_id,relation_id from user_relations where user_rel_id union select user_rel_id as user_id,relation_id from user_relations where user_id=1;
+---------+-------------+
| user_id | relation_id |
+---------+-------------+
| 1 | 1 |
| 2 | 2 |
| 1 | 3 |
| 2 | 1 |
| 3 | 3 |
+---------+-------------+
5 rows in set (0.01 sec)
mysql> select user_id,relation_id from user_relations where user_rel_id=1 union select user_rel_id as user_id,relation_id from user_relations where user_id=1;
+---------+-------------+
| user_id | relation_id |
+---------+-------------+
| 2 | 1 |
| 3 | 3 |
+---------+-------------+
2 rows in set (0.00 sec)
mysql> select a.user_name,b.relation_name from user_info a,relation_define b, (select user_id,relation_id from user_relations where user_rel_id=1 union select user_rel_id as user_id,relation_id from user_relations where user_id=1) c where a.user_id=c.user_id and b.relation_id=c.relation_id;
+-----------+---------------+
| user_name | relation_name |
+-----------+---------------+
| Rose | 同事 |
| jack | 朋友 |
+-----------+---------------+
2 rows in set (0.01 sec)