Mycat使用全局表及ER关系表

1. 使用全局表

• 在schema.xml中配置全局表

<table name=dict primaryKey=did type=global dataNode=node1,node2,node3/>

• 启动执行mycat

mycat console或mycat start

• 连接mycat,执行建表语句

CREATE TABLE dict(
    did BIGINT AUTO_INCREMENT,
    title   VARCHAR(50),
    content   TEXT ,
    CONSTRAINT pk_did PRIMARY KEY(did)
)ENGINE=InnoDB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8 ROW_FORMAT=DYNAMIC COMMENT='字典表';

• 插入数据

INSERT INTO dict(title,content) VALUES ('info-a',@@hostname);
INSERT INTO dict(title,content) VALUES ('info-b',@@hostname);
INSERT INTO dict(title,content) VALUES ('info-c',@@hostname);

• 查询

select * from dict;

2. 增加全局区域表

CREATE TABLE area (
	id INT NOT NULL PRIMARY KEY auto_increment,
	NAME VARCHAR (20) NOT NULL
)ENGINE=InnoDB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8 ROW_FORMAT=DYNAMIC COMMENT='区域表';

 insert into area(name) values('北京');
 insert into area(name) values('上海');
 insert into area(name) values('广州');
 insert into area(name) values('深圳');

3. ER关系表

• 配置ER关系

<table name=t_order primaryKey=id autoIncrement=true dataNode=node1,node2,node3 rule=mod-long>
    <childTable name=t_order_detail primaryKey=id joinKey=order_id parentKey=id />
</table>

• 创建表

CREATE TABLE `t_order` (
`id` int(11) NOT NULL PRIMARY KEY,
`sn` varchar(64) NOT NULL,
`create_time` datetime NOT NULL,
KEY `id` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8 ROW_FORMAT=DYNAMIC COMMENT='订单表';

CREATE TABLE `t_order_detail` (
`id` int(11) NOT NULL PRIMARY KEY,
`order_id` int(11) NOT NULL,
`address` varchar(128) NOT NULL,
`create_time` datetime NOT NULL,
KEY `fk_ordid` (`order_id`)
) ENGINE=InnoDB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8 ROW_FORMAT=DYNAMIC COMMENT='订单详情表';

• 插入数据

INSERT INTO `t_order` (id,sn,create_time) VALUES (next value for MYCATSEQ_ORDERSEQ, 'BJ0001', NOW());
INSERT INTO `t_order` (id,sn,create_time) VALUES (next value for MYCATSEQ_ORDERSEQ, 'BJ0002', NOW());
INSERT INTO `t_order` (id,sn,create_time) VALUES (next value for MYCATSEQ_ORDERSEQ, 'BJ0003', NOW());
INSERT INTO `t_order` (id,sn,create_time) VALUES (next value for MYCATSEQ_ORDERSEQ, 'BJ0004',NOW());

INSERT INTO t_order_detail(id,order_id,address,create_time) VALUES (next value for MYCATSEQ_ORDERDETAILSEQ,1,'test data of ORDER1(ID=1,BJ001) ',NOW());
INSERT INTO t_order_detail(id,order_id,address,create_time) VALUES (next value for MYCATSEQ_ORDERDETAILSEQ,2,'test data of ORDER1(ID=1,BJ002) ',NOW());
INSERT INTO t_order_detail(id,order_id,address,create_time) VALUES (next value for MYCATSEQ_ORDERDETAILSEQ,2,'test data of ORDER1(ID=1,BJ002) ',NOW());
INSERT INTO t_order_detail(id,order_id,address,create_time) VALUES (next value for MYCATSEQ_ORDERDETAILSEQ,3,'test data of ORDER1(ID=1,BJ003) ',NOW());
INSERT INTO t_order_detail(id,order_id,address,create_time) VALUES (next value for MYCATSEQ_ORDERDETAILSEQ,3,'test data of ORDER1(ID=1,BJ003) ',NOW());
INSERT INTO t_order_detail(id,order_id,address,create_time) VALUES (next value for MYCATSEQ_ORDERDETAILSEQ,4,'test data of ORDER1(ID=1,BJ004) ',NOW());

• 查询

select * from t_order a join t_order_detail b on a.id = b.order_id;