目录
MyCat中有两种方式
- 本地文件方式 (用于测试)
- server.xml
- sequence_conf.properties
- schema.xml
- 数据库方式 (用于生产)
- server.xml
- dbseq.sql
- sequence_db_conf.properties
- 时间方式
- 待续
一、本地文件方式
server.xml
[root@localhost conf]# vim /opt/mycat/conf/server.xml
<?xml version="1.0" encoding="UTF-8"?>
<!-- - - Licensed under the Apache License, Version 2.0 (the "License");
- you may not use this file except in compliance with the License. - You
may obtain a copy of the License at - - http://www.apache.org/licenses/LICENSE-2.0
- - Unless required by applicable law or agreed to in writing, software -
distributed under the License is distributed on an "AS IS" BASIS, - WITHOUT
WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - See the
License for the specific language governing permissions and - limitations
under the License. -->
<!DOCTYPE mycat:server SYSTEM "server.dtd">
<mycat:server xmlns:mycat="http://io.mycat/">
<system>
<property name="nonePasswordLogin">0</property> <!-- 0为需要密码登陆、1为不需要密码登陆 ,默认为0，设置为1则需要指定默认账户-->
<property name="useHandshakeV10">1</property>
<property name="useSqlStat">0</property> <!-- 1为开启实时统计、0为关闭 -->
<property name="useGlobleTableCheck">0</property> <!-- 1为开启全加班一致性检测、0为关闭 -->
<property name="sqlExecuteTimeout">300</property> <!-- SQL 执行超时 单位:秒-->
<property name="sequnceHandlerType">0</property>
<!--<property name="sequnceHandlerPattern">(?:(\s*next\s+value\s+for\s*MYCATSEQ_(\w+))(,|\)|\s)*)+</property>-->
<!--必须带有MYCATSEQ_或者 mycatseq_进入序列匹配流程 注意MYCATSEQ_有空格的情况-->
<property name="sequnceHandlerPattern">(?:(\s*next\s+value\s+for\s*MYCATSEQ_(\w+))(,|\)|\s)*)+</property>
<property name="subqueryRelationshipCheck">false</property> <!-- 子查询中存在关联查询的情况下,检查关联字段中是否有分片字段 .默认 false -->
<!-- <property name="useCompression">1</property>--> <!--1为开启mysql压缩协议-->
<!-- <property name="fakeMySQLVersion">5.6.20</property>--> <!--设置模拟的MySQL版本号-->
<!-- <property name="processorBufferChunk">40960</property> -->
<!--
<property name="processors">1</property>
<property name="processorExecutor">32</property>
-->
<!--默认为type 0: DirectByteBufferPool | type 1 ByteBufferArena | type 2 NettyBufferPool -->
<property name="processorBufferPoolType">0</property>
<!--默认是65535 64K 用于sql解析时最大文本长度 -->
<!--<property name="maxStringLiteralLength">65535</property>-->
<!--<property name="sequnceHandlerType">0</property>-->
<!--<property name="backSocketNoDelay">1</property>-->
<!--<property name="frontSocketNoDelay">1</property>-->
<!--<property name="processorExecutor">16</property>-->
<!--
<property name="serverPort">8066</property> <property name="managerPort">9066</property>
<property name="idleTimeout">300000</property> <property name="bindIp">0.0.0.0</property>
<property name="dataNodeIdleCheckPeriod">300000</property> 5 * 60 * 1000L; //连接空闲检查
<property name="frontWriteQueueSize">4096</property> <property name="processors">32</property> -->
<!--分布式事务开关，0为不过滤分布式事务，1为过滤分布式事务（如果分布式事务内只涉及全局表，则不过滤），2为不过滤分布式事务,但是记录分布式事务日志-->
<property name="handleDistributedTransactions">0</property>
<!--
off heap for merge/order/group/limit 1开启 0关闭
-->
<property name="useOffHeapForMerge">0</property>
<!--
单位为m
-->
<property name="memoryPageSize">64k</property>
<!--
单位为k
-->
<property name="spillsFileBufferSize">1k</property>
<property name="useStreamOutput">0</property>
<!--
单位为m
-->
<property name="systemReserveMemorySize">384m</property>
<!--是否采用zookeeper协调切换 -->
<property name="useZKSwitch">false</property>
<!-- XA Recovery Log日志路径 -->
<!--<property name="XARecoveryLogBaseDir">./</property>-->
<!-- XA Recovery Log日志名称 -->
<!--<property name="XARecoveryLogBaseName">tmlog</property>-->
<!--如果为 true的话 严格遵守隔离级别,不会在仅仅只有select语句的时候在事务中切换连接-->
<property name="strictTxIsolation">false</property>
<property name="useZKSwitch">true</property>
</system>
<!-- 全局SQL防火墙设置 -->
<!--白名单可以使用通配符%或着*-->
<!--例如<host host="127.0.0.*" user="root"/>-->
<!--例如<host host="127.0.*" user="root"/>-->
<!--例如<host host="127.*" user="root"/>-->
<!--例如<host host="1*7.*" user="root"/>-->
<!--这些配置情况下对于127.0.0.1都能以root账户登录-->
<!--
<firewall>
<whitehost>
<host host="1*7.0.0.*" user="root"/>
</whitehost>
<blacklist check="false">
</blacklist>
</firewall>
-->
<user name="root" defaultAccount="true">
<property name="password">123456</property>
<property name="schemas">user</property>
</user>
<user name="user">
<property name="password">user</property>
<property name="schemas">user</property>
<property name="readOnly">true</property>
</user>
</mycat:server>
name="sequnceHandlerType" = 0 本地文件方式
sequence_conf.properties
[root@localhost conf]# vim /opt/mycat/conf/sequence_conf.properties
O_ORDER.HISIDS=
O_ORDER.MINID=1001
O_ORDER.MAXID=20000000 # 最大自增值
O_ORDER.CURID=1000
追加或者修改跟库一样名称的 order --> O_ORDER
schema.xml
[root@localhost conf]# vim /opt/mycat/conf/schema.xml
<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/">
<!--
checkSQLschema属性：该字段就是用户执行sql语句时，是否检查表明的schema，当该值设置为 true 时，如果我们执行语句(select * from USERDB.tb_user)则 MyCat 会把语句修改为(select * from tb_user)。即把表示 schema 的name去掉，避免发送到后端数据库执行时报错。建议将该字段设置为false。
-->
<schema name="user" checkSQLschema="false" sqlMaxLimit="100">
<!-- auto sharding by id (long) -->
<table name="user" dataNode="dn246,dn247" rule="mod-long" />
<table name="province" dataNode="dn246,dn247" type="global"/>
<!--
autoIncrement="true" 自增意思
primaryKey="id" 指定主键
-->
<table name="o_order" autoIncrement="true" primaryKey="id" dataNode="dn246,dn247" rule="auto-sharding-long" >
<!--
表名: order_item
用于子表关联的id: order_id
父表中的主键key: id
-->
<childTable name="order_item" joinKey="order_id" parentKey="id"/>
</table>
<!-- <table name="oc_call" primaryKey="ID" dataNode="dn1$0-743" rule="latest-month-calldate"
/> -->
</schema>
<!-- <dataNode name="dn1$0-743" dataHost="localhost1" database="db$0-743"
/> -->
<dataNode name="dn246" dataHost="db246" database="user_246" />
<dataNode name="dn247" dataHost="db247" database="user_247" />
<!-- <dataNode name="dn3" dataHost="localhost1" database="db3" /> -->
<!--<dataNode name="dn4" dataHost="sequoiadb1" database="SAMPLE" />
<dataNode name="jdbc_dn1" dataHost="jdbchost" database="db1" />
<dataNode name="jdbc_dn2" dataHost="jdbchost" database="db2" />
<dataNode name="jdbc_dn3" dataHost="jdbchost" database="db3" /> -->
<dataHost name="db246" maxCon="1000" minCon="10" balance="0"
writeType="0" dbType="mysql" dbDriver="native" switchType="1" slaveThreshold="100">
<heartbeat>select user()</heartbeat>
<!-- can have multi write hosts -->
<writeHost host="M1" url="192.168.8.246:3306" user="eddie" password="Abc@123456">
<readHost host="S1" url="192.168.8.245:3306" user="eddie" password="Abc@123456" />
</writeHost>
<!-- <writeHost host="M2" url="192.168.8.245:3306" user="eddie" password="Abc@123456"/> -->
<!-- <writeHost host="hostS1" url="localhost:3316" user="root"
password="123456" /> -->
<!-- <writeHost host="hostM2" url="localhost:3316" user="root" password="123456"/> -->
</dataHost>
<dataHost name="db247" maxCon="1000" minCon="10" balance="0"
writeType="0" dbType="mysql" dbDriver="native" switchType="1" slaveThreshold="100">
<heartbeat>select user()</heartbeat>
<!-- can have multi write hosts -->
<writeHost host="M1" url="192.168.8.247:3306" user="eddie"
password="Abc@123456">
<!-- can have multi read hosts -->
<!-- <readHost host="hostS2" url="192.168.1.200:3306" user="root" password="xxx" /> -->
</writeHost>
<!-- <writeHost host="hostS1" url="192.168.8.247:3316" user="root"
password="123456" /> -->
<!-- <writeHost host="hostM2" url="localhost:3316" user="root" password="123456"/> -->
</dataHost>
<!--
<dataHost name="sequoiadb1" maxCon="1000" minCon="1" balance="0" dbType="sequoiadb" dbDriver="jdbc">
<heartbeat> </heartbeat>
<writeHost host="hostM1" url="sequoiadb://1426587161.dbaas.sequoialab.net:11920/SAMPLE" user="jifeng" password="jifeng"></writeHost>
</dataHost>
<dataHost name="oracle1" maxCon="1000" minCon="1" balance="0" writeType="0" dbType="oracle" dbDriver="jdbc"> <heartbeat>select 1 from dual</heartbeat>
<connectionInitSql>alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss'</connectionInitSql>
<writeHost host="hostM1" url="jdbc:oracle:thin:@127.0.0.1:1521:nange" user="base" password="123456" > </writeHost> </dataHost>
<dataHost name="jdbchost" maxCon="1000" minCon="1" balance="0" writeType="0" dbType="mongodb" dbDriver="jdbc">
<heartbeat>select user()</heartbeat>
<writeHost host="hostM" url="mongodb://192.168.0.99/test" user="admin" password="123456" ></writeHost> </dataHost>
<dataHost name="sparksql" maxCon="1000" minCon="1" balance="0" dbType="spark" dbDriver="jdbc">
<heartbeat> </heartbeat>
<writeHost host="hostM1" url="jdbc:hive2://feng01:10000" user="jifeng" password="jifeng"></writeHost> </dataHost> -->
<!-- <dataHost name="jdbchost" maxCon="1000" minCon="10" balance="0" dbType="mysql"
dbDriver="jdbc"> <heartbeat>select user()</heartbeat> <writeHost host="hostM1"
url="jdbc:mysql://localhost:3306" user="root" password="123456"> </writeHost>
</dataHost> -->
</mycat:schema>
checkSQLschema="false", autoIncrement="true" primaryKey="id"
问题记录
-- > 2013 - Lost connection to MySQL server during query, is mycat bug
-- > checkSQLschema属性设置false
INSERT INTO o_order (id,total_amount,order_status) VALUES (next value FOR mycatseq_O_ORDER,89,4)
修改 checkSQLschema="false"
-- > 1064 - bad insert sql (sharding column:ID not provided,INSERT INTO o_order (total_amount, order_status) VALUES (89, 4)
-- > 没有提供分片列
INSERT INTO o_order (total_amount,order_status) VALUES (89,4)
添加 autoIncrement="true" primaryKey="id"
-- > 修改后没有生效
mysql> reload @@config;
Query OK, 1 row affected (0.02 sec)
Reload config success
效果图
二、数据库方式
server.xml
[root@localhost conf]# vim /opt/mycat/conf/server.xml
<!-- 0 修改 1 -->
<property name="sequnceHandlerType">1</property>
dbseq.sql
-- ----------------------------
-- cat /opt/mycat/conf/dbseq.sql
-- 新建节点表，只能存放一个节点。为了保证唯一性
-- sz dbseq.sql 下载到本地，使用 Navicat 在 8.246 运行sql 导入 （多了 MYCAT_SEQUENCE 表 和 四个函数）
--
-- ----------------------------
DROP TABLE IF EXISTS MYCAT_SEQUENCE;
CREATE TABLE MYCAT_SEQUENCE ( name VARCHAR(64) NOT NULL, current_value BIGINT(20) NOT NULL, increment INT NOT NULL DEFAULT 1, PRIMARY KEY (name) ) ENGINE=InnoDB;
-- ----------------------------
-- Function structure for `mycat_seq_currval`
-- ----------------------------
DROP FUNCTION IF EXISTS `mycat_seq_currval`;
DELIMITER ;;
CREATE FUNCTION `mycat_seq_currval`(seq_name VARCHAR(64)) RETURNS varchar(64) CHARSET latin1
DETERMINISTIC
BEGIN
DECLARE retval VARCHAR(64);
SET retval="-1,0";
SELECT concat(CAST(current_value AS CHAR),",",CAST(increment AS CHAR) ) INTO retval FROM MYCAT_SEQUENCE WHERE name = seq_name;
RETURN retval ;
END
;;
DELIMITER ;
-- ----------------------------
-- Function structure for `mycat_seq_nextval`
-- ----------------------------
DROP FUNCTION IF EXISTS `mycat_seq_nextval`;
DELIMITER ;;
CREATE FUNCTION `mycat_seq_nextval`(seq_name VARCHAR(64)) RETURNS varchar(64) CHARSET latin1
DETERMINISTIC
BEGIN
DECLARE retval VARCHAR(64);
DECLARE val BIGINT;
DECLARE inc INT;
DECLARE seq_lock INT;
set val = -1;
set inc = 0;
SET seq_lock = -1;
SELECT GET_LOCK(seq_name, 15) into seq_lock;
if seq_lock = 1 then
SELECT current_value + increment, increment INTO val, inc FROM MYCAT_SEQUENCE WHERE name = seq_name for update;
if val != -1 then
UPDATE MYCAT_SEQUENCE SET current_value = val WHERE name = seq_name;
end if;
SELECT RELEASE_LOCK(seq_name) into seq_lock;
end if;
SELECT concat(CAST((val - inc + 1) as CHAR),",",CAST(inc as CHAR)) INTO retval;
RETURN retval;
END
;;
DELIMITER ;
-- ----------------------------
-- Function structure for `mycat_seq_setvals`
-- ----------------------------
DROP FUNCTION IF EXISTS `mycat_seq_nextvals`;
DELIMITER ;;
CREATE FUNCTION `mycat_seq_nextvals`(seq_name VARCHAR(64), count INT) RETURNS VARCHAR(64) CHARSET latin1
DETERMINISTIC
BEGIN
DECLARE retval VARCHAR(64);
DECLARE val BIGINT;
DECLARE seq_lock INT;
SET val = -1;
SET seq_lock = -1;
SELECT GET_LOCK(seq_name, 15) into seq_lock;
if seq_lock = 1 then
SELECT current_value + count INTO val FROM MYCAT_SEQUENCE WHERE name = seq_name for update;
IF val != -1 THEN
UPDATE MYCAT_SEQUENCE SET current_value = val WHERE name = seq_name;
END IF;
SELECT RELEASE_LOCK(seq_name) into seq_lock;
end if;
SELECT CONCAT(CAST((val - count + 1) as CHAR), ",", CAST(val as CHAR)) INTO retval;
RETURN retval;
END
;;
DELIMITER ;
-- ----------------------------
-- Function structure for `mycat_seq_setval`
-- ----------------------------
DROP FUNCTION IF EXISTS `mycat_seq_setval`;
DELIMITER ;;
CREATE FUNCTION `mycat_seq_setval`(seq_name VARCHAR(64), value BIGINT) RETURNS varchar(64) CHARSET latin1
DETERMINISTIC
BEGIN
DECLARE retval VARCHAR(64);
DECLARE inc INT;
SET inc = 0;
SELECT increment INTO inc FROM MYCAT_SEQUENCE WHERE name = seq_name;
UPDATE MYCAT_SEQUENCE SET current_value = value WHERE name = seq_name;
SELECT concat(CAST(value as CHAR),",",CAST(inc as CHAR)) INTO retval;
RETURN retval;
END
;;
DELIMITER ;
INSERT INTO MYCAT_SEQUENCE VALUES ('GLOBAL', 1, 1);
在 MYCAT_SEQUENCE 插入一条数据：表名、起始值、每次追加1
INTO `user_246`.`MYCAT_SEQUENCE`(`name`, `current_value`, `increment`) VALUES ('O_ORDER', 10000, 1)
[root@localhost conf]# vim /opt/mycat/conf/sequence_db_conf.properties
#sequence stored in datanode
GLOBAL=dn1
COMPANY=dn1
CUSTOMER=dn1
ORDERS=dn1
O_ORDER=dn246
O_ORDER=dn246: schema.xml 选择创建表的节点 <dataHost name="db246"
插入测试数据后，MYCAT_SEQUENCE的current_value +1
INSERT INTO o_order (total_amount,order_status) VALUES (89,4)
