<!--sequnceHandlerType=0表示:使用本地文件的方式配置mycat的全局序列号，对应sequence_conf.properties文件sequnceHandlerType=1表示：使用数据库表的方式配置mycat的全局序列号--><property name="sequnceHandlerType">0</property>

<!--sequnceHandlerType=0表示:使用本地文件的方式配置mycat的全局序列号，对应sequence_conf.properties文件sequnceHandlerType=1表示：使用数据库表的方式配置mycat的全局序列号--><property name="sequnceHandlerType">1</property>

DROP TABLE IF EXISTS MYCAT_SEQUENCE;

/*创建存放sequence的表*/CREATE TABLE MYCAT_SEQUENCE (NAME VARCHAR (50),current_value INT NOT NULL,increment INT NOT NULL DEFAULT 100,PRIMARY KEY (NAME)
) ENGINE = INNODB;

INSERT INTO MYCAT_SEQUENCE (NAME,current_value,increment
)
VALUES('GLOBAL', 100000, 100);

-- ----------------------------
-- 函数结构: `mycat_seq_currval`
-- 获取当前sequence的值(返回当前值，增量)
-- ----------------------------DROP FUNCTION
IF EXISTS mycat_seq_currval;CREATE  FUNCTION `mycat_seq_currval`(seq_name VARCHAR(50)) RETURNS varchar(64) CHARSET latin1DETERMINISTIC
BEGINDECLARE 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

-- ----------------------------
-- 函数结构: `mycat_seq_setval`
-- 设置sequence的值
-- ----------------------------DROP FUNCTION IF EXISTS mycat_seq_setval;CREATE  FUNCTION `mycat_seq_setval`(seq_name VARCHAR(50), value INTEGER) RETURNS varchar(64) CHARSET latin1DETERMINISTIC
BEGINDECLARE 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

-- ----------------------------
-- 函数结构: `mycat_seq_nextval`
-- 获取下一个sequence的值
-- ----------------------------
DROP FUNCTION IF EXISTS mycat_seq_nextval;
CREATE  FUNCTION `mycat_seq_nextval`(seq_name VARCHAR(50)) RETURNS varchar(64) CHARSET latin1DETERMINISTIC
BEGINDECLARE 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 thenSELECT current_value + increment, increment INTO val, inc FROM MYCAT_SEQUENCE WHERE name = seq_name for update;if val != -1 thenUPDATE 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

insert into travelrecord(id,name)values(next value for MYCATSEQ_GLOBAL,'hexmith');

insert into travelrecord(id,name)values(next value for MYCATSEQ_GLOBAL,'Mycat');