有一類業務，例如訂單（ORDER）跟訂單明細表（ORDER_DETAIL）,明細表會依賴二訂單，就是該會存在表的主從關系，這類似業務的切分可以抽象出合適的切分規則，比如根據用戶ID切分,其它相關的表都依賴於用戶ID，再或者根據訂單ID進行切分，總之部分業務總會可以抽象出父子關系的表。這類表適用於ER分片表，子表的記錄與所關聯的父表記錄存放在同一個數據分片上，避免數據Join跨庫操作，以order與order_detail例子為例，schema.xml中定義合適的分片配置,order,order_detail 根據order_id迕行數據切分，保證相同order_id的數據分到同一個分片上，在進行數據插入操作時，Mycat會獲取order所在的分片，然後將order_detail也插入到order所在的分片。
在rule.xml裡面設定分片規則
id
mod-long
然後重啟mycat或者重新加載mycat
本blog源地址：http://blog.csdn.net/mchdba/article/details/50655304，不經過原作者mchdba(黃杉)允許，謝絕轉載
2.2 先建表， ORDER 和 ORDER_DETAIL 表，有主外鍵關系
CREATE TABLE ORDER1(ID INT NOT NULL AUTO_INCREMENT PRIMARY KEY,SN VARCHAR(64),CREATE_TIME DATETIME);
CREATE TABLE ORDER_DETAIL(ID INT AUTO_INCREMENT PRIMARY KEY, ORDER_ID INT,ORD_STATUS CHAR(1),ADDRESS VARCHAR(128),CREATE_TIME DATETIME,CONSTRAINT FK_ORDID11 FOREIGN KEY (ORDER_ID) REFERENCES ORDER1 (ID));
mysql> CREATE TABLE ORDER1(ID INT NOT NULL AUTO_INCREMENT PRIMARY KEY,SN VARCHAR(64),CREATE_TIME DATETIME);
Query OK, 0 rows affected (0.06 sec)
mysql>
mysql> CREATE TABLE ORDER_DETAIL(ID INT AUTO_INCREMENT PRIMARY KEY, ORDER_ID INT,ORD_STATUS CHAR(1),ADDRESS VARCHAR(128),CREATE_TIME DATETIME,CONSTRAINT FK_ORDID FOREIGN KEY (ORDER_ID) REFERENCES ORDER1 (ID));
Query OK, 0 rows affected (0.02 sec)
mysql>
3.3 錄入數據：
mysql>
mysql> explain INSERT INTO ORDER1(SN,CREATE_TIME) VALUES('BJ0001',NOW());
ERROR 1064 (HY000): bad insert sql (sharding column:ID not provided,INSERT INTO ORDER1 (SN, CREATE_TIME)
VALUES ('BJ0001', NOW())
mysql> explain INSERT INTO ORDER1(SN,CREATE_TIME) VALUES('BJ0001',NOW());
ERROR 1064 (HY000): bad insert sql (sharding column:ID not provided,INSERT INTO ORDER1 (SN, CREATE_TIME)
VALUES ('BJ0001', NOW())
mysql> INSERT INTO ORDER1(ID,SN,CREATE_TIME) VALUES(1,'BJ0001',NOW());
Query OK, 1 row affected (0.03 sec)
mysql>
錄入數據，一組組錄入，涉及到外鍵關系：
第一組北京的訂單
mysql> INSERT INTO ORDER1(ID,SN,CREATE_TIME) VALUES(1,'BJ0001',NOW());
Query OK, 1 row affected (0.03 sec)
mysql>
mysql> INSERT INTO ORDER_DETAIL(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (1,1,'1','test data of ORDER1(ID=1,BJ001) ',NOW());
Query OK, 1 row affected (0.00 sec)
mysql>
第二組上海的訂單：
mysql> INSERT INTO ORDER1(ID,SN,CREATE_TIME) VALUES(3,'SHH001',NOW());
Query OK, 1 row affected (0.01 sec)
mysql> INSERT INTO ORDER_DETAIL(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (3,3,'1','test data of ORDER1(ID=3,SHH001) ',NOW());
mysql>
第三組廣州的訂單：
mysql> INSERT INTO ORDER1(ID,SN,CREATE_TIME) VALUES(4,'GZH004',NOW());
Query OK, 1 row affected (0.01 sec)
mysql> INSERT INTO ORDER_DETAIL(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (4,4,'1','test data of ORDER1(ID=4,GZH004) ',NOW());
mysql>
第四組 武漢的訂單，這裡故意將order_id設置成4，看看效果，是否隨id為4的廣州的那組分片：
mysql> INSERT INTO ORDER1(ID,SN,CREATE_TIME) VALUES(5,'WUHAN005',NOW());
ERROR 1064 (HY000): Index: 2, Size: 2
mysql> INSERT INTO ORDER1(ID,SN,CREATE_TIME) VALUES(6,'WUHAN006',NOW());
Query OK, 1 row affected (0.02 sec)
mysql> INSERT INTO ORDER_DETAIL(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (6,4,'1','test data of ORDER1(ID=6,WUHAN005) ',NOW());
2.4 驗證子表是否隨父表分片，果然驗證如下，大家看到訂單詳細表ORDER_DETAIL的數據的分片都是隨ORDER_ID所在外鍵的父表的分片：
[root@test_1_11logs]# /usr/local/mysql56s1/bin/mysql -uroot -p -P3317 --socket=/usr/local/mysql56s1/mysql.sock -e "select @@port;select * from db3.ORDER1; select * from db3.ORDER_DETAIL";
Enter password:
+--------+
| @@port |
+--------+
| 3327 |
+--------+
+----+--------+---------------------+
| ID | SN | CREATE_TIME |
+----+--------+---------------------+
| 1 | BJ0001 | 2016-02-11 22:54:26 |
| 4 | GZH004 | 2016-02-11 22:57:49 |
+----+--------+---------------------+
+----+----------+------------+--------------------------------------+---------------------+
| ID | ORDER_ID | ORD_STATUS | ADDRESS | CREATE_TIME |
+----+----------+------------+--------------------------------------+---------------------+
| 1 | 1 | 1 | test data of ORDER1(ID=1,BJ001) | 2016-02-11 23:07:05 |
| 4 | 4 | 1 | test data of ORDER1(ID=4,GZH004) | 2016-02-11 23:09:48 |
| 6 | 4 | 1 | test data of ORDER1(ID=6,WUHAN005) | 2016-02-11 23:10:18 |
+----+----------+------------+--------------------------------------+---------------------+
[root@test_1_11logs]#
[root@test_1_11logs]#
[root@test_1_11logs]# /usr/local/mysql56s1/bin/mysql -uroot -p -P3327 --socket=/usr/local/mysql56m1/mysql.sock -e "select @@port;select * from db3.ORDER1; select * from db3.ORDER_DETAIL";
Enter password:
+--------+
| @@port |
+--------+
| 3317 |
+--------+
+----+----------+---------------------+
| ID | SN | CREATE_TIME |
+----+----------+---------------------+
| 3 | SHH001 | 2016-02-11 22:57:26 |
| 6 | WUHAN006 | 2016-02-11 23:04:39 |
+----+----------+---------------------+
+----+----------+------------+------------------------------------+---------------------+
| ID | ORDER_ID | ORD_STATUS | ADDRESS | CREATE_TIME |
+----+----------+------------+------------------------------------+---------------------+
| 3 | 3 | 1 | test data of ORDER1(ID=3,SHH001) | 2016-02-11 23:09:02 |
+----+----------+------------+------------------------------------+---------------------+
[root@test_1_11logs]#
2.5 有日志為列，看到SHH001這個訂單的數據錄入都在端口為3317的分片mysql實例上，如下驗證：
[root@test_1_11logs]# more mycat.log|grep SHH001
02/11 22:56:58.477 DEBUG [$_NIOREACTOR-3-RW] (ServerQueryHandler.java:56) -ServerConnection [id=1, schema=TESTDB, host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]INSERT INTO ORDER1(ID,SN,CREATE_TIME) VALUES(2,'SHH001',NOW())
02/11 22:56:58.478 WARN [$_NIOREACTOR-3-RW] (ServerConnection.java:209) -ServerConnection [id=1, schema=TESTDB, host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]INSERT INTO ORDER1(ID,SN,CREATE_TIME) VALUES(2,'SHH001',NOW()) err:java.lang.IndexOutOfBoundsException: Index: 2, Size: 2
02/11 22:57:22.476 DEBUG [$_NIOREACTOR-3-RW] (ServerQueryHandler.java:56) -ServerConnection [id=1, schema=TESTDB, host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]INSERT INTO ORDER1(ID,SN,CREATE_TIME) VALUES(2,'SHH001',NOW())
02/11 22:57:22.477 WARN [$_NIOREACTOR-3-RW] (ServerConnection.java:209) -ServerConnection [id=1, schema=TESTDB, host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]INSERT INTO ORDER1(ID,SN,CREATE_TIME) VALUES(2,'SHH001',NOW()) err:java.lang.IndexOutOfBoundsException: Index: 2, Size: 2
02/11 22:57:26.988 DEBUG [$_NIOREACTOR-3-RW] (ServerQueryHandler.java:56) -ServerConnection [id=1, schema=TESTDB, host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]INSERT INTO ORDER1(ID,SN,CREATE_TIME) VALUES(3,'SHH001',NOW())
02/11 22:57:26.989 DEBUG [$_NIOREACTOR-3-RW] (NonBlockingSession.java:113) -ServerConnection [id=1, schema=TESTDB, host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]INSERT INTO ORDER1(ID,SN,CREATE_TIME) VALUES(3,'SHH001',NOW()), route={
1 -> dn21{INSERT INTO ORDER1(ID,SN,CREATE_TIME) VALUES(3,'SHH001',NOW())}
02/11 22:57:26.999 DEBUG [$_NIOREACTOR-0-RW] (NonBlockingSession.java:229) -release connection MySQLConnection [id=4, lastTime=1455202646984, user=root, schema=db3, old shema=db3, borrowed=true, fromSlaveDB=false, threadId=91, charset=latin1, txIsolation=3, autocommit=true, attachment=dn21{INSERT INTO ORDER1(ID,SN,CREATE_TIME) VALUES(3,'SHH001',NOW())}, respHandler=SingleNodeHandler [node=dn21{INSERT INTO ORDER1(ID,SN,CREATE_TIME) VALUES(3,'SHH001',NOW())}, packetId=0], host=12.23.2.11, port=3317, statusSync=null, writeQueue=0, modifiedSQLExecuted=true]
02/11 23:09:02.690 DEBUG [$_NIOREACTOR-3-RW] (ServerQueryHandler.java:56) -ServerConnection [id=1, schema=TESTDB, host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]INSERT INTO ORDER_DETAIL(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (3,3,'1','test data of ORDER1(ID=3,SHH001) ',NOW())
VALUES (3, 3, '1', 'test data of ORDER1(ID=3,SHH001) ', NOW())
02/11 23:09:02.692 DEBUG [$_NIOREACTOR-3-RW] (NonBlockingSession.java:113) -ServerConnection [id=1, schema=TESTDB, host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]INSERT INTO ORDER_DETAIL(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (3,3,'1','test data of ORDER1(ID=3,SHH001) ',NOW()), route={
VALUES (3, 3, '1', 'test data of ORDER1(ID=3,SHH001) ', NOW())}
VALUES (3, 3, '1', 'test data of ORDER1(ID=3,SHH001) ', NOW())}, respHandler=SingleNodeHandler [node=dn21{INSERT INTO ORDER_DETAIL (ID, ORDER_ID, ORD_STATUS, ADDRESS, CREATE_TIME)
VALUES (3, 3, '1', 'test data of ORDER1(ID=3,SHH001) ', NOW())}, packetId=0], host=12.23.2.11, port=3317, statusSync=null, writeQueue=0, modifiedSQLExecuted=true]
[root@test_1_11logs]#
【】看到直接22:57:26.988時間點處有數據錄入，22:57:26.989處有路由分配 route={dn21了，直接走父表的路由了**
2.6 查詢路由mycat命令行裡面執行：
mysql> explain select t1.*,t2.* from ORDER1 t1,ORDER_DETAIL t2 where t2.ORD_STATUS='1' and t2.ID=1 and t1.ID=t2.ORDER_ID;
+-----------+-----------------------------------------------------------------------------------------------------------+
| DATA_NODE | SQL |
+-----------+-----------------------------------------------------------------------------------------------------------+
| dn21 | select t1.*,t2.* from ORDER1 t1,ORDER_DETAIL t2 where t2.ORD_STATUS='1' and t2.ID=1 and t1.ID=t2.ORDER_ID |
| dn22 | select t1.*,t2.* from ORDER1 t1,ORDER_DETAIL t2 where t2.ORD_STATUS='1' and t2.ID=1 and t1.ID=t2.ORDER_ID |
+-----------+-----------------------------------------------------------------------------------------------------------+
2 rows in set (0.00 sec)
mysql> select t1.*,t2.* from ORDER1 t1,ORDER_DETAIL t2 where t2.ORD_STATUS='1' and t2.ID=1 and t1.ID=t2.ORDER_ID;
+----+--------+---------------------+----+----------+------------+-----------------------------------+---------------------+
| ID | SN | CREATE_TIME | ID | ORDER_ID | ORD_STATUS | ADDRESS | CREATE_TIME |
+----+--------+---------------------+----+----------+------------+-----------------------------------+---------------------+
| 1 | BJ0001 | 2016-02-12 17:51:24 | 1 | 1 | 1 | test data of ORDER1(ID=1,BJ001) | 2016-02-12 17:51:30 |
+----+--------+---------------------+----+----------+------------+-----------------------------------+---------------------+
1 row in set (0.01 sec)
mysql>
【】mycat.log後台日志debug信息，看到走的route路由是dn21和dn22，所有的節點路由都走了：
02/12 18:22:51.444 DEBUG [$_NIOREACTOR-2-RW] (ServerQueryHandler.java:56) -ServerConnection [id=3, schema=TESTDB, host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]explain select t1.*,t2.* from ORDER1 t1,ORDER_DETAIL t2 where t2.ORD_STATUS='1' and t2.ID=1 and t1.ID=t2.ORDER_ID
02/12 18:22:51.444 DEBUG [$_NIOREACTOR-2-RW] (EnchachePool.java:76) -SQLRouteCache miss cache ,key:TESTDB select t1.*,t2.* from ORDER1 t1,ORDER_DETAIL t2 where t2.ORD_STATUS='1' and t2.ID=1 and t1.ID=t2.ORDER_ID
02/12 18:22:51.448 DEBUG [$_NIOREACTOR-2-RW] (EnchachePool.java:59) -SQLRouteCache add cache ,key:TESTDB select t1.*,t2.* from ORDER1 t1,ORDER_DETAIL t2 where t2.ORD_STATUS='1' and t2.ID=1 and t1.ID=t2.ORDER_ID value:select t1.*,t2.* from ORDER1 t1,ORDER_DETAIL t2 where t2.ORD_STATUS='1' and t2.ID=1 and t1.ID=t2.ORDER_ID, route={
1 -> dn21{select t1.*,t2.* from ORDER1 t1,ORDER_DETAIL t2 where t2.ORD_STATUS='1' and t2.ID=1 and t1.ID=t2.ORDER_ID}
2 -> dn22{select t1.*,t2.* from ORDER1 t1,ORDER_DETAIL t2 where t2.ORD_STATUS='1' and t2.ID=1 and t1.ID=t2.ORDER_ID}
}
02/12 18:23:01.214 DEBUG [Timer0] (ConnectionHeartBeatHandler.java:52) -do heartbeat for con MySQLConnection [id=18, lastTime=1455272581207, user=root, schema=db2, old shema=db2, borrowed=true, fromSlaveDB=false, threadId=18, charset=latin1, txIsolation=0, autocommit=true, attachment=null, respHandler=null, host=12.23.2.11, port=3317, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]
02/12 18:23:01.215 DEBUG [Timer0] (ConnectionHeartBeatHandler.java:52) -do heartbeat for con MySQLConnection [id=22, lastTime=1455272581207, user=root, schema=db2, old shema=db2, borrowed=true, fromSlaveDB=false, threadId=21, charset=latin1, txIsolation=0, autocommit=true, attachment=null, respHandler=null, host=12.23.2.11, port=3317, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]
![這裡寫圖片描述](https://www.aspphp.online/shujuku/UploadFiles_3118/201701/2017012011323267.png "\")
圖片1.jpg2.7 總結：當子表與父表的關聯字段正好是父表的分片字段時，子表直接根據父表規則進行分片，在數據錄入的時候子表直接放在父表的分片上面，在進行關聯查詢join的時候，走的是
3 .父表的分片字段為其他字段，以PROVINCE字段分片，字表的分片字段與主表ID關聯，配置為ＥＲ分片3.1 各種配置在schema.xml裡面添加表配置
在rule.xml裡面設定分片規則
PROVINCE
province-str-split
1
partition-hash-str-pro.txt
0
新添加partition-hash-str-pro.txt
[root@test_1_11conf]# more partition-hash-str-pro.txt
beijing=0
shanghai=1
tianjing=2
[root@test_1_11conf]#
然後重啟mycat或者重新加載mycat
3.2 建表
CREATE TABLE ORDER2(ID INT NOT NULL AUTO_INCREMENT PRIMARY KEY,PROVINCE VARCHAR(16),SN VARCHAR(64),CREATE_TIME DATETIME);
CREATE TABLE ORDER_DETAIL2(ID INT AUTO_INCREMENT PRIMARY KEY, ORDER_ID INT,ORD_STATUS CHAR(1),ADDRESS VARCHAR(128),CREATE_TIME DATETIME,CONSTRAINT FK_ORDID21 FOREIGN KEY (ORDER_ID) REFERENCES ORDER2 (ID));
mysql> CREATE TABLE ORDER2(ID INT NOT NULL AUTO_INCREMENT PRIMARY KEY,SN VARCHAR(64),CREATE_TIME DATETIME);
Query OK, 0 rows affected (0.05 sec)
mysql> CREATE TABLE ORDER_DETAIL2(ID INT AUTO_INCREMENT PRIMARY KEY, ORDER_ID INT,ORD_STATUS CHAR(1),ADDRESS VARCHAR(128),CREATE_TIME DATETIME,CONSTRAINT FK_ORDID21 FOREIGN KEY (ORDER_ID) REFERENCES ORDER2 (ID));
Query OK, 0 rows affected (0.02 sec)
mysql>
3.2 錄入數據，一組組錄入，涉及到外鍵關系：
INSERT INTO ORDER2(ID,PROVINCE,SN,CREATE_TIME) VALUES(1,'beijing','2BJ0001',NOW());
INSERT INTO ORDER_DETAIL2(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (1,1,'1','test data of ORDER1(ID=1,2BJ0001) ',NOW());
mysql> INSERT INTO ORDER2(ID,PROVINCE,SN,CREATE_TIME) VALUES(1,'beijing','2BJ0001',NOW());
Query OK, 1 row affected (0.01 sec)
mysql> INSERT INTO ORDER_DETAIL2(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (1,1,'1','test data of ORDER1(ID=1,2BJ0001) ',NOW());
Query OK, 1 row affected (0.21 sec)
mysql>
INSERT INTO ORDER2(ID,PROVINCE,SN,CREATE_TIME) VALUES(3,'shanghai','2SHH001',NOW());
INSERT INTO ORDER_DETAIL2(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (3,3,'1','test data of ORDER1(ID=3,2SHH001) ',NOW());
mysql> INSERT INTO ORDER2(ID,PROVINCE,SN,CREATE_TIME) VALUES(3,'shanghai','2SHH001',NOW());
Query OK, 1 row affected (0.01 sec)
mysql> INSERT INTO ORDER_DETAIL2(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (3,3,'1','test data of ORDER1(ID=3,2SHH001) ',NOW());
Query OK, 1 row affected (0.41 sec)
mysql>
INSERT INTO ORDER2(ID,PROVINCE,SN,CREATE_TIME) VALUES(4,'beijing','2GZH004',NOW());
INSERT INTO ORDER_DETAIL2(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (4,4,'1','test data of ORDER1(ID=4,2GZH004) ',NOW());
mysql> INSERT INTO ORDER2(ID,PROVINCE,SN,CREATE_TIME) VALUES(4,'beijing','2GZH004',NOW());
Query OK, 1 row affected (0.00 sec)
mysql> INSERT INTO ORDER_DETAIL2(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (4,4,'1','test data of ORDER1(ID=4,2GZH004) ',NOW());
Query OK, 1 row affected (0.21 sec)
mysql>
INSERT INTO ORDER2(ID,PROVINCE,SN,CREATE_TIME) VALUES(6,'shanghai','2WUHAN006',NOW());
INSERT INTO ORDER_DETAIL2(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (6,4,'1','test data of ORDER1(ID=6,2WUHAN006) ',NOW());
mysql> INSERT INTO ORDER2(ID,PROVINCE,SN,CREATE_TIME) VALUES(6,'shanghai','2WUHAN006',NOW());
Query OK, 1 row affected (0.02 sec)
mysql> INSERT INTO ORDER_DETAIL2(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (6,4,'1','test data of ORDER1(ID=6,2WUHAN006) ',NOW());
Query OK, 1 row affected (0.22 sec)
mysql>
mysql> INSERT INTO ORDER_DETAIL2(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (6,9,'1','test data of ORDER1(ID=6,2WUHAN006) ',NOW());
ERROR 1064 (HY000): can't find (root) parent sharding node for sql:INSERT INTO ORDER_DETAIL2(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (6,9,'1','test data of ORDER1(ID=6,2WUHAN006) ',NOW())
mysql>
3.3 數據驗證
[root@test_1_11~]# /usr/local/mysql56s1/bin/mysql -uroot -p --socket=/usr/local/mysql56s1/mysql.sock -e "select @@port;select * from db3.ORDER2; select * from db3.ORDER_DETAIL2";
Enter password:
+--------+
| @@port |
+--------+
| 3327 |
+--------+
+----+----------+-----------+---------------------+
| ID | PROVINCE | SN | CREATE_TIME |
+----+----------+-----------+---------------------+
| 3 | shanghai | 2SHH001 | 2016-02-12 17:24:00 |
| 6 | shanghai | 2WUHAN006 | 2016-02-12 17:24:14 |
+----+----------+-----------+---------------------+
+----+----------+------------+-------------------------------------+---------------------+
| ID | ORDER_ID | ORD_STATUS | ADDRESS | CREATE_TIME |
+----+----------+------------+-------------------------------------+---------------------+
| 3 | 3 | 1 | test data of ORDER1(ID=3,2SHH001) | 2016-02-12 17:24:04 |
+----+----------+------------+-------------------------------------+---------------------+
[root@test_1_11~]#
[root@test_1_11~]# /usr/local/mysql56s1/bin/mysql -uroot -p --socket=/usr/local/mysql56m1/mysql.sock -e "select @@port;select * from db3.ORDER2; select * from db3.ORDER_DETAIL2";
Enter password:
+--------+
| @@port |
+--------+
| 3317 |
+--------+
+----+----------+---------+---------------------+
| ID | PROVINCE | SN | CREATE_TIME |
+----+----------+---------+---------------------+
| 1 | beijing | 2BJ0001 | 2016-02-12 17:23:46 |
| 4 | beijing | 2GZH004 | 2016-02-12 17:24:07 |
+----+----------+---------+---------------------+
+----+----------+------------+---------------------------------------+---------------------+
| ID | ORDER_ID | ORD_STATUS | ADDRESS | CREATE_TIME |
+----+----------+------------+---------------------------------------+---------------------+
| 1 | 1 | 1 | test data of ORDER1(ID=1,2BJ0001) | 2016-02-12 17:23:50 |
| 4 | 4 | 1 | test data of ORDER1(ID=4,2GZH004) | 2016-02-12 17:24:11 |
| 6 | 4 | 1 | test data of ORDER1(ID=6,2WUHAN006) | 2016-02-12 17:24:17 |
+----+----------+------------+---------------------------------------+---------------------+
[root@test_1_11~]#
3.4 mycat.log中debug日志顯示，通過關鍵字2BJ0001來檢索父子數據記錄的錄入情況vim mycat.log
02/12 17:23:50.530 DEBUG [$_NIOREACTOR-2-RW] (RouterUtil.java:1188) -find root parent's node sql select order2.id from order2 where order2.id=1
02/12 17:23:50.531 DEBUG [BusinessExecutor3] (EnchachePool.java:76) -ER_SQL2PARENTID miss cache ,key:TESTDB:select order2.id from order2 where order2.id=1
02/12 17:23:50.531 DEBUG [BusinessExecutor3] (FetchStoreNodeOfChildTableHandler.java:73) -find child node with sql:select order2.id from order2 where order2.id=1
02/12 17:23:50.531 DEBUG [BusinessExecutor3] (FetchStoreNodeOfChildTableHandler.java:81) -execute in datanode dn21
02/12 17:23:50.531 DEBUG [BusinessExecutor3] (PhysicalDBPool.java:452) -select read source hostM2 for dataHost:m1
02/12 17:23:50.532 DEBUG [$_NIOREACTOR-0-RW] (FetchStoreNodeOfChildTableHandler.java:154) -received rowResponse response,1 from MySQLConnection [id=8, lastTime=1455269030515, user=root, schema=db3, old shema=db3, borrowed=true, fromSlaveDB=false, threadId=15, charset=latin1, txIsolation=0, autocommit=true, attachment=dn21, respHandler=org.opencloudb.mysql.nio.handler.FetchStoreNodeOfChildTableHandler@dde0e41, host=12.23.2.11, port=3317, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]
02/12 17:23:50.533 DEBUG [$_NIOREACTOR-0-RW] (PhysicalDatasource.java:403) -release channel MySQLConnection [id=8, lastTime=1455269030515, user=root, schema=db3, old shema=db3, borrowed=true, fromSlaveDB=false, threadId=15, charset=latin1, txIsolation=0, autocommit=true, attachment=null, respHandler=null, host=12.23.2.11, port=3317, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]
02/12 17:23:50.732 DEBUG [BusinessExecutor4] (RouterUtil.java:1213) -found partion node for child table to insert dn21 sql :INSERT INTO ORDER_DETAIL2(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (1,1,'1','test data of ORDER1(ID=1,2BJ0001) ',NOW())
02/12 17:23:50.733 DEBUG [BusinessExecutor4] (NonBlockingSession.java:113) -ServerConnection [id=3, schema=TESTDB, host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]INSERT INTO ORDER_DETAIL2(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (1,1,'1','test data of ORDER1(ID=1,2BJ0001) ',NOW()), route={
1 -> dn21{INSERT INTO ORDER_DETAIL2(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (1,1,'1','test data of ORDER1(ID=1,2BJ0001) ',NOW())}
} rrs
02/12 17:23:50.735 DEBUG [$_NIOREACTOR-3-RW] (NonBlockingSession.java:229) -release connection MySQLConnection [id=7, lastTime=1455269030715, user=root, schema=db3, old shema=db3, borrowed=true, fromSlaveDB=false, threadId=14, charset=latin1, txIsolation=3, autocommit=true, attachment=dn21{INSERT INTO ORDER_DETAIL2(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (1,1,'1','test data of ORDER1(ID=1,2BJ0001) ',NOW())}, respHandler=SingleNodeHandler [node=dn21{INSERT INTO ORDER_DETAIL2(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (1,1,'1','test data of ORDER1(ID=1,2BJ0001) ',NOW())}, packetId=0], host=12.23.2.11, port=3317, statusSync=null, writeQueue=0, modifiedSQLExecuted=true]
02/12 17:23:50.735 DEBUG [$_NIOREACTOR-3-RW] (PhysicalDatasource.java:403) -release channel MySQLConnection [id=7, lastTime=1455269030715, user=root, schema=db3, old shema=db3, borrowed=true, fromSlaveDB=false, threadId=14, charset=latin1, txIsolation=3, autocommit=true, attachment=null, respHandler=null, host=12.23.2.11, port=3317, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]
【】可以看到在17:23:50.532處，看到find root parent’s node sql select order2.id from order2 where order2.id=1這樣的日志記錄，就是通過外鍵鎖涉及的父表的關聯字段id去找所在分片記錄，然後在17:23:50.732看到已經路由出來了分片地址route={dn21。
3.5 如果錄入不存在的父表數據的時候路由情況數據錄入：
mysql> INSERT INTO ORDER_DETAIL2(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (6,9,'1','test data of ORDER1(ID=6,2WUHAN006) ',NOW());
ERROR 1064 (HY000): can't find (root) parent sharding node for sql:INSERT INTO ORDER_DETAIL2(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (6,9,'1','test data of ORDER1(ID=6,2WUHAN006) ',NOW())
mysql>
查看日志mycat.log情況：
02/12 17:54:43.351 DEBUG [$_NIOREACTOR-2-RW] (ServerQueryHandler.java:56) -ServerConnection [id=3, schema=TESTDB, host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]INSERT INTO ORDER_DETAIL2(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (6,9,'1','test data of ORDER1(ID=6,2WUHAN006) ',NOW())
02/12 17:54:43.352 DEBUG [$_NIOREACTOR-2-RW] (RouterUtil.java:1188) -find root parent's node sql select order2.id from order2 where order2.id=9
02/12 17:54:43.353 DEBUG [BusinessExecutor7] (EnchachePool.java:76) -ER_SQL2PARENTID miss cache ,key:TESTDB:select order2.id from order2 where order2.id=9
02/12 17:54:43.353 DEBUG [BusinessExecutor7] (FetchStoreNodeOfChildTableHandler.java:73) -find child node with sql:select order2.id from order2 where order2.id=9
02/12 17:54:43.353 DEBUG [BusinessExecutor7] (FetchStoreNodeOfChildTableHandler.java:81) -execute in datanode dn21
02/12 17:54:43.353 DEBUG [BusinessExecutor7] (PhysicalDBPool.java:452) -select read source hostM2 for dataHost:m1
02/12 17:54:43.354 DEBUG [$_NIOREACTOR-3-RW] (PhysicalDatasource.java:403) -release channel MySQLConnection [id=7, lastTime=1455270883346, user=root, schema=db3, old shema=db3, borrowed=true, fromSlaveDB=false, threadId=14, charset=latin1, txIsolation=3, autocommit=true, attachment=null, respHandler=null, host=12.23.2.11, port=3317, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]
02/12 17:54:43.554 DEBUG [BusinessExecutor7] (FetchStoreNodeOfChildTableHandler.java:81) -execute in datanode dn22
02/12 17:54:43.554 DEBUG [BusinessExecutor7] (PhysicalDBPool.java:452) -select read source hostM2 for dataHost:m2
02/12 17:54:43.554 DEBUG [$_NIOREACTOR-3-RW] (PhysicalDatasource.java:403) -release channel MySQLConnection [id=15, lastTime=1455270883547, user=root, schema=db3, old shema=db3, borrowed=true, fromSlaveDB=false, threadId=14, charset=latin1, txIsolation=3, autocommit=true, attachment=null, respHandler=null, host=12.23.2.11, port=3327, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]
02/12 17:54:43.805 WARN [BusinessExecutor3] (RouterUtil.java:1206) -org.opencloudb.server.NonBlockingSession@634984c8INSERT INTO ORDER_DETAIL2(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (6,9,'1','test data of ORDER1(ID=6,2WUHAN006) ',NOW()) err:can't find (root) parent sharding node for sql:INSERT INTO ORDER_DETAIL2(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (6,9,'1','test data of ORDER1(ID=6,2WUHAN006) ',NOW())
看到，遍歷了所有節點dn21和dn22之後，select order2.id from order2 where order2.id=9執行後沒有找到記錄，就報錯了 can’t find (root) parent sharding node for sql:
3.6 join關聯查詢涉及到的路由，是全節點遍歷查詢
mysql> explain select t1.*,t2.* from ORDER2 t1,ORDER_DETAIL2 t2 where t2.ORD_STATUS='1' and t2.ID=6;
+-----------+--------------------------------------------------------------------------------------+
| DATA_NODE | SQL |
+-----------+--------------------------------------------------------------------------------------+
| dn21 | select t1.*,t2.* from ORDER2 t1,ORDER_DETAIL2 t2 where t2.ORD_STATUS='1' and t2.ID=6 |
| dn22 | select t1.*,t2.* from ORDER2 t1,ORDER_DETAIL2 t2 where t2.ORD_STATUS='1' and t2.ID=6 |
+-----------+--------------------------------------------------------------------------------------+
2 rows in set (0.00 sec)
mysql>
mysql> select t1.*,t2.* from ORDER2 t1,ORDER_DETAIL2 t2 where t2.ORD_STATUS='1' and t2.ID=6;
+----+----------+---------+---------------------+----+----------+------------+---------------------------------------+---------------------+
| ID | PROVINCE | SN | CREATE_TIME | ID | ORDER_ID | ORD_STATUS | ADDRESS | CREATE_TIME |
+----+----------+---------+---------------------+----+----------+------------+---------------------------------------+---------------------+
| 1 | beijing | 2BJ0001 | 2016-02-12 17:23:46 | 6 | 4 | 1 | test data of ORDER1(ID=6,2WUHAN006) | 2016-02-12 17:24:17 |
| 4 | beijing | 2GZH004 | 2016-02-12 17:24:07 | 6 | 4 | 1 | test data of ORDER1(ID=6,2WUHAN006) | 2016-02-12 17:24:17 |
+----+----------+---------+---------------------+----+----------+------------+---------------------------------------+---------------------+
2 rows in set (0.01 sec)
mysql>
02/12 18:02:23.370 DEBUG [$_NIOREACTOR-2-RW] (ServerQueryHandler.java:56) -ServerConnection [id=3, schema=TESTDB, host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]select t1.*,t2.* from ORDER2 t1,ORDER_DETAIL2 t2 where t2.ORD_STATUS='1' and t2.ID=6
02/12 18:02:23.371 DEBUG [$_NIOREACTOR-2-RW] (EnchachePool.java:76) -SQLRouteCache miss cache ,key:TESTDBselect t1.*,t2.* from ORDER2 t1,ORDER_DETAIL2 t2 where t2.ORD_STATUS='1' and t2.ID=6
02/12 18:02:23.373 DEBUG [$_NIOREACTOR-2-RW] (EnchachePool.java:59) -SQLRouteCache add cache ,key:TESTDBselect t1.*,t2.* from ORDER2 t1,ORDER_DETAIL2 t2 where t2.ORD_STATUS='1' and t2.ID=6 value:select t1.*,t2.* from ORDER2 t1,ORDER_DETAIL2 t2 where t2.ORD_STATUS='1' and t2.ID=6, route={
1 -> dn21{select t1.*,t2.* from ORDER2 t1,ORDER_DETAIL2 t2 where t2.ORD_STATUS='1' and t2.ID=6}
2 -> dn22{select t1.*,t2.* from ORDER2 t1,ORDER_DETAIL2 t2 where t2.ORD_STATUS='1' and t2.ID=6}
}
02/12 18:02:23.373 DEBUG [$_NIOREACTOR-2-RW] (NonBlockingSession.java:113) -ServerConnection [id=3, schema=TESTDB, host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]select t1.*,t2.* from ORDER2 t1,ORDER_DETAIL2 t2 where t2.ORD_STATUS='1' and t2.ID=6, route={
1 -> dn21{select t1.*,t2.* from ORDER2 t1,ORDER_DETAIL2 t2 where t2.ORD_STATUS='1' and t2.ID=6}
2 -> dn22{select t1.*,t2.* from ORDER2 t1,ORDER_DETAIL2 t2 where t2.ORD_STATUS='1' and t2.ID=6}
} rrs
3.7 【】總結：當子表與父表的關聯字段不是父表的分片字段時，必須通過查找對應的父表記錄來確認子表所在分片，如果找不到則會拋出錯誤，在join查詢的時候，路由走的是所有分片節點。4，報錯處理總結4.1 報錯1：
mysql> INSERT INTO ORDER2(ID,SN,CREATE_TIME) VALUES(1,'2BJ0001',NOW());
ERROR 1064 (HY000): For input string: "2BJ0001"
mysql>
報錯是因為分片字段是str字符串，所以需要修改分片規則1中type從0改成1，0是數字型分片，1是字符串分片。
4.2 報錯2：
mysql> INSERT INTO ORDER_DETAIL2(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (1,1,'1','test data of ORDER1(ID=1,2BJ0001) ',NOW());
ERROR 1064 (HY000): can't find (root) parent sharding node for sql:INSERT INTO ORDER_DETAIL2(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (1,1,'1','test data of ORDER1(ID=1,2BJ0001) ',NOW())
mysql>
解決方案1：此類ER表癿揑入操作丌能做為一個亊務迕行數捤提交，如果父子表在一個亊務中迕行提交，顯然在亊務沒有提交前子表是無法查刡父表癿數捤癿，因此就無法確定sharding node。如果是ER關系癿表在揑入數捤時丌能在同一個亊務中提交數捤，叧能分開提交。
4.3 報錯3解決方案2：上面的方案2個事務搞不定，所以查看後台mycat.log，日志
02/12 14:32:09.378 DEBUG [$_NIOREACTOR-3-RW] (ServerQueryHandler.java:56) -ServerConnection [id=1, schema=TESTDB, host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]INSERT INTO ORDER_DETAIL2(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (1,1,'1','test data of ORDER1(ID=1,2BJ0001) ',NOW())
02/12 14:32:09.506 DEBUG [$_NIOREACTOR-3-RW] (RouterUtil.java:1188) -find root parent's node sql select order2.id from order2 where order2.id=1
02/12 14:32:09.513 DEBUG [BusinessExecutor5] (EnchachePool.java:76) -ER_SQL2PARENTID miss cache ,key:TESTDB:select order2.id from order2 where order2.id=1
02/12 14:32:09.513 DEBUG [BusinessExecutor5] (FetchStoreNodeOfChildTableHandler.java:73) -find child node with sql:select order2.id from order2 where order2.id=1
02/12 14:32:09.514 DEBUG [BusinessExecutor5] (FetchStoreNodeOfChildTableHandler.java:81) -execute in datanode dn21
02/12 14:32:09.514 DEBUG [BusinessExecutor5] (PhysicalDBPool.java:452) -select read source hostM2 for dataHost:m1
02/12 14:32:09.535 WARN [$_NIOREACTOR-3-RW] (FetchStoreNodeOfChildTableHandler.java:135) -errorResponse 1146 Table 'db3.order2' doesn't exist
02/12 14:32:09.535 DEBUG [$_NIOREACTOR-3-RW] (PhysicalDatasource.java:403) -release channel MySQLConnection [id=3, lastTime=1455258729497, user=root, schema=db3, old shema=db3, borrowed=true, fromSlaveDB=false, threadId=290, charset=latin1, txIsolation=0, autocommit=true, attachment=null, respHandler=null, host=12.23.2.11, port=3317, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]
02/12 14:32:09.715 DEBUG [BusinessExecutor5] (FetchStoreNodeOfChildTableHandler.java:81) -execute in datanode dn22
02/12 14:32:09.715 DEBUG [BusinessExecutor5] (PhysicalDBPool.java:452) -select read source hostM2 for dataHost:m2
02/12 14:32:09.716 WARN [$_NIOREACTOR-1-RW] (FetchStoreNodeOfChildTableHandler.java:135) -errorResponse 1146 Table 'db3.order2' doesn't exist
後台執行sql確實找不到
mysql> select order2.id from order2 where order2.id=1;
ERROR 1105 (HY000): Table 'db3.order2' doesn't exist
mysql>
原因是2個datanode是互為主從的關系，dn21和dn22是mm結構，然後停止mm結構，2個都是單獨的mysql，然後重建ORDER2和ORDER_DETAIL2表，再執行insert操作，ok，問題解決了。
4.4 報錯4解決方案3：表名字大小寫的問題導致
mysql> INSERT INTO ORDER_DETAIL2(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (1,1,'1','test data of ORDER1(ID=1,2BJ0001) ',NOW());
ERROR 1064 (HY000): can't find (root) parent sharding node for sql:INSERT INTO ORDER_DETAIL2(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (1,1,'1','test data of ORDER1(ID=1,2BJ0001) ',NOW())
mysql>
後台報錯：
02/12 17:04:24.583 DEBUG [$_NIOREACTOR-0-RW] (ServerQueryHandler.java:56) -ServerConnection [id=5, schema=TESTDB, host=127.0.0.1, user=test,txIsolation=3, autocommit=true, schema=TESTDB]INSERT INTO ORDER_DETAIL2(ID,ORDER_ID,ORD_STATUS,ADDRESS,CREATE_TIME) VALUES (1,1,'1','test data of ORDER1(ID=1,2BJ0001) ',NOW())
02/12 17:04:24.584 DEBUG [$_NIOREACTOR-0-RW] (RouterUtil.java:1188) -find root parent's node sql select order2.id from order2 where order2.id=1
02/12 17:04:24.584 DEBUG [BusinessExecutor6] (EnchachePool.java:76) -ER_SQL2PARENTID miss cache ,key:TESTDB:select order2.id from order2 where order2.id=1
02/12 17:04:24.585 DEBUG [BusinessExecutor6] (FetchStoreNodeOfChildTableHandler.java:73) -find child node with sql:select order2.id from order2 where order2.id=1
02/12 17:04:24.585 DEBUG [BusinessExecutor6] (FetchStoreNodeOfChildTableHandler.java:81) -execute in datanode dn21
02/12 17:04:24.585 DEBUG [BusinessExecutor6] (PhysicalDBPool.java:452) -select read source hostM2 for dataHost:m1
02/12 17:04:24.585 WARN [$_NIOREACTOR-3-RW] (FetchStoreNodeOfChildTableHandler.java:135) -errorResponse 1146 Table 'db3.order2' doesn't exist
mysql> select * from db3.order2;
ERROR 1146 (42S02): Table 'db3.order2' doesn't exist
mysql> select * from db3.ORDER2;
Empty set (0.01 sec)
mysql>
mysql>
[mysqld]
lower_case_table_names = 1
然後重啟mysql已經mycat服務，再次進行check。
