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一、需求说明
将DB2中的实时数据按天和小时汇总到汇总表中。
二、过程及步骤
第一步：编写DB2存储过程。
1. 在Dbvisualizer中新建SQL editor。
2. 代码：
1 --/ 2 CREATE PROCEDURE "NCPOLLDATA"."AGGREGATE_ENTITY_DAILY" 3 () 4 LANGUAGE SQL 5 SPECIFIC SQL160427123206300 6 BEGIN 7 --declare varibles 8 DECLARE V_PREFIX_TIME VARCHAR(7); 9 DECLARE V_START_TIME VARCHAR(16); 10 DECLARE V_END_TIME VARCHAR(16); 11 DECLARE V_AGGREGATE_TIMESTAMP BIGINT DEFAULT 0; 12 DECLARE V_YEAR_VALUE INTEGER DEFAULT 0; 13 DECLARE V_MONTH_VALUE INTEGER DEFAULT 0; 14 DECLARE V_AGGREGATE_TIME TIMESTAMP; 15 --set varibles value 16 SET V_PREFIX_TIME = (‘1‘ || REPLACE(SUBSTR(CHAR(current_timestamp - 1 DAYS), 3, 9), ‘-‘, ‘‘)); 17 SET V_START_TIME = V_PREFIX_TIME || ‘000000000‘; 18 SET V_END_TIME = V_PREFIX_TIME || ‘235959999‘; 19 SET V_YEAR_VALUE = YEAR(current_timestamp - 1 DAYS); 20 SET V_MONTH_VALUE = MONTH(current_timestamp - 1 DAYS); 21 SET V_AGGREGATE_TIME = current_timestamp - 1 DAYS; 22 SET V_AGGREGATE_TIMESTAMP = TIMESTAMPDIFF(2, CHAR(current_timestamp - TIMESTAMP(‘1970-01-01-00.00.00‘))); 23 --action 24 FOR TEMP_CUR AS 25 SELECT t1.MONITOREDOBJECTID AS "POLICY_ID", t2.MAINNODEENTITYID AS "ENTITY_ID", 26 MIN(VALUE) AS "MIN_VALUE", MAX(VALUE) AS "MAX_VALUE", AVG(BIGINT(VALUE)) AS "AVG_VALUE", 27 COUNT(VALUE) AS "DATA_COUNT", SUM(BIGINT(VALUE)) AS "DATA_SUM" 28 FROM POLLDATA t1 LEFT JOIN MONITOREDINSTANCE t2 ON t1.MONITOREDINSTID = t2.MONITOREDINSTID 29 WHERE t1.TDWTIME BETWEEN V_START_TIME AND V_END_TIME 30 GROUP BY t1.MONITOREDOBJECTID, t2.MAINNODEENTITYID 31 ORDER BY t1.MONITOREDOBJECTID, t2.MAINNODEENTITYID 32 DO 33 --insert statement 34 INSERT INTO POLLDATA_ENTITY_DAILY 35 VALUES (TEMP_CUR.POLICY_ID, TEMP_CUR.ENTITY_ID, V_AGGREGATE_TIMESTAMP, 36 V_YEAR_VALUE, V_MONTH_VALUE, V_AGGREGATE_TIME, 37 TEMP_CUR.MIN_VALUE, TEMP_CUR.MAX_VALUE, TEMP_CUR.AVG_VALUE, TEMP_CUR.DATA_COUNT, TEMP_CUR.DATA_SUM); 38 END FOR; 39 END 40 /
注意：在Dbvisualizer中编写DB2存储过程，第一行的 --/ 和最后一行的 / 是必不可少的否则报错。
3. 执行存储过程: 点击Dbvisualizer的存储过程编辑框的执行按钮即可，也可以在命令行中执行call procedure_name。
第二步：编写可在Linux系统执行的脚本命令。
#!/bin/sh DB2_HOME=/opt/IBM/tivoli/netcool/platform/linux2x86/db2 PATH=$DB2_HOME/bin:$PATH export $DB2_HOME export $PATH startTime=`date +%Y%m%d%H%M%S` echo $startTime echo "开始执行脚本" db2 connect to ITNM user NCIM using tiv0li echo "连接上数据库，开始执行脚本" db2 "call NCPOLLDATA.AGGREGATE_ENTITY_DAILY()" endTime=`date +%Y%m%d%H%M%S` echo $endTime echo "脚本执行完毕！关闭数据库连接" db2 terminate
以上命令参考资料：http://blog.csdn.net/sweetbowie/article/details/19614289
第三步：设置crond服务随Linux系统自启动
root@localhost ~]# /etc/init.d/crond restart
如果让crond在开机时运行，应该改变其运行级别
[root@localhost ~]# chkconfig --levels 35 crond on
【相关资料链接】
1. http://blog.csdn.net/sweetbowie/article/details/19614289
2. http://www.linuxidc.com/Linux/2012-02/54391.htm
3. http://blog.csdn.net/liu_xing_hui/article/details/6565804/
4. http://blog.csdn.net/lulei9876/article/details/9170151
5. http://blog.csdn.net/jiujie395/article/details/8692655
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原文地址：http://www.cnblogs.com/maxiaolang/p/5439337.html
