前言
在最近的项目中，由于需要使用MySQL的UDF（user defined function），这个特性从未使用过，而且个人觉得这个特性以后应该会经常使用，所以写下博文，记录和分享这个特性的用法。
UDF是mysql的一个拓展接口，UDF（Userdefined function）可翻译为用户自定义函数，这个是用来拓展Mysql的技术手段。
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官方介绍请点击 -
有关MySQL5.7在CentOS7.0上的安装配置请参考 http://www.linuxidc.com/Linux/2017-05/144363.htm
1. 下载
https://github.com/mysqludf/lib_mysqludf_sys
2. 安装
#安装mysql的两个依赖包
[root@dtadmin apollo ~]# rpm -ivh mysql-community-libs-compat-5.7.17-1.el7.x86_64.rpm
[root@dtadmin apollo ~]# rpm -ivh mysql-community-devel-5.7.17-1.el7.x86_64.rpm
#安装gcc gcc-c++编译器
[root@dtadmin apollo ~]# yum install gcc gcc-c++
3. 解压
[root@dtadmin apollo ~]# unzip lib_mysqludf_sys-master.zip
4. 执行命令
#进入目录
[root@dtadmin apollo ~]# cd lib_mysqludf_sys-master
# 在目录lib_mysqludf_sys-master执行：
[root@dtadmin lib_mysqludf_sys-master ~]# gcc -DMYSQL_DYNAMIC_PLUGIN -fPIC -Wall -I/usr/include/mysql -I. -shared lib_mysqludf_sys.c -o lib_mysqludf_sys.so
5. 把编译后的 lib_mysqludf_sys.so 拷到 /usr/lib64/mysql/plugin/
[root@dtadmin lib_mysqludf_sys-master ~]# cp lib_mysqludf_sys.so /usr/lib64/mysql/plugin/
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6. 在mysql中执行
[root@dtadmin lib_mysqludf_sys-master ~]# mysql -u root -p --default-character-set=utf8
执行以下脚本：
Drop FUNCTION IF EXISTS lib_mysqludf_sys_info;
Drop FUNCTION IF EXISTS sys_get;
Drop FUNCTION IF EXISTS sys_set;
Drop FUNCTION IF EXISTS sys_exec;
Drop FUNCTION IF EXISTS sys_eval;
Create FUNCTION lib_mysqludf_sys_info RETURNS string SONAME 'lib_mysqludf_sys.so';
Create FUNCTION sys_get RETURNS string SONAME 'lib_mysqludf_sys.so';
Create FUNCTION sys_set RETURNS int SONAME 'lib_mysqludf_sys.so';
Create FUNCTION sys_exec RETURNS int SONAME 'lib_mysqludf_sys.so';
Create FUNCTION sys_eval RETURNS string SONAME 'lib_mysqludf_sys.so';
7.在/var/lib/mysql-files目录下新建脚本
[root@dtadmin lib_mysqludf_sys-master ~]# cd /var/lib/mysql-files
[root@dtadmin mysql-files ~]# load_data_infile.sh
脚本内容如下：
#!/bin/bash
HOSTNAME="192.168.56.101" #mysql hostname
PORT="3306" #mysql port
USERNAME="root" # the username for DBNAME
PASSWORD="Love88me=-.," # the password for USERNAME and DBNAME
DBNAME="subs" #DBNAME
cmd_load_data_infile="LOAD DATA INFILE '$1' REPLACE INTO TABLE $2 FIELDS TERMINATED BY '\t\t\t';"
mysql -h${HOSTNAME} -P${PORT} -u${USERNAME} -p${PASSWORD} -D${DBNAME} -e "${cmd_load_data_infile}"
8.改变文件的执行权限
[root@dtadmin mysql-files ~]# chmod u+x load_data_infile.sh
9.示例，定时备份数据表数据到另一张表
9.1.创建存储过程
use DBNAME;
drop table if exists sbux_nc_request_hist;
drop table if exists sbux_nc_edm_message_hist;
drop table if exists sbux_nc_mail_message_hist;
drop table if exists sbux_nc_push_message_hist;
drop table if exists sbux_nc_sms_message_hist;
drop table if exists sbux_nc_wechat_message_hist;
drop table if exists sbux_nc_sys_log_hist;
drop table if exists sbux_nc_sms_log_hist;
drop table if exists sbux_nc_push_log_hist;
drop table if exists sbux_nc_wechat_log_hist;
drop table if exists sbux_nc_edm_log_hist;
drop table if exists sbux_nc_mail_log_hist;
create table sbux_nc_request_hist like sbux_nc_request;
create table sbux_nc_edm_message_hist like sbux_nc_edm_message;
create table sbux_nc_mail_message_hist like sbux_nc_mail_message;
create table sbux_nc_push_message_hist like sbux_nc_push_message;
create table sbux_nc_sms_message_hist like sbux_nc_sms_message;
create table sbux_nc_wechat_message_hist like sbux_nc_wechat_message;
create table sbux_nc_sys_log_hist like sbux_nc_sys_log;
create table sbux_nc_edm_log_hist like sbux_nc_edm_log;
create table sbux_nc_mail_log_hist like sbux_nc_mail_log;
create table sbux_nc_push_log_hist like sbux_nc_push_log;
create table sbux_nc_sms_log_hist like sbux_nc_sms_log;
create table sbux_nc_wechat_log_hist like sbux_nc_wechat_log;
drop procedure if exists sbux_nc_data_migrate_p;
delimiter // ;
CREATE PROCEDURE sbux_nc_data_migrate_p()
BEGIN
DECLARE v_same_date_last_period date; # 上月同一天
DECLARE v_max_hist_date date; # 历史表中的最大时间
DECLARE v_current_date date; # 当前日期
DECLARE v_table_name varchar(50); # 变量，用来存储游标遍历中的要备份表的表名
DECLARE v_engine varchar(50); # 表的存储引擎
DECLARE v_create_options varchar(50); # 创建表的选项(是否是分区表)
DECLARE FLAG int default 0; # 游标的标记
DECLARE v_auto_increment int default 0; # 设置下个自增长列
DECLARE v_file_path varchar(200) default '/var/lib/mysql-files/'; # MySQL中的存储datafile的路径
DECLARE v_separator varchar(200) default " fields terminated by '\\t\\t\\t'"; # 导出文件的分隔符
DECLARE v_file varchar(500); # 导出文件的全名(路径+文件名)
DECLARE v_result int default 0; # 执行文件的结果标记
DECLARE v_flag int DEFAULT 0; # 执行shell脚本的标记
# 声明游标：查询出要做数据备份的表的列表
DECLARE cur_table_list CURSOR FOR
SELECT table_name, engine, create_options
FROM information_schema.TABLES
WHERE table_schema='DBMAME'
AND table_name in
(
'sbux_nc_request' ,
'sbux_nc_edm_message',
'sbux_nc_mail_message',
'sbux_nc_push_message',
'sbux_nc_sms_message',
'sbux_nc_wechat_message',
'sbux_nc_sys_log',
'sbux_nc_edm_log',
'sbux_nc_mail_log',
'sbux_nc_push_log',
'sbux_nc_sms_log',
'sbux_nc_wechat_log'
);
DECLARE CONTINUE HANDLER FOR NOT FOUND SET flag=1; #设置游标退出标记
SELECT date_sub(current_date(),interval 1 month) INTO v_same_date_last_period; # 查询上月同一天的日期
SELECT current_date() INTO v_current_date; # 查询当前日期
# 清空目录下面的文件
select sys_exec('rm -rf /var/lib/mysql-files/sbux_nc_*') into v_result;
# 遍历游标
OPEN cur_table_list;
FETCH cur_table_list INTO v_table_name,v_engine,v_create_options;
WHILE(flag1) DO
# 存储原表中所有数据到文件
SET @stmt = CONCAT('select * into outfile ',"'",v_file_path, v_table_name,'_hist.dat', "'",' ', v_separator, ' from ',v_table_name,';');
PREPARE stmt FROM @stmt;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
# 设置要备份表的时间段
SET @condition =
case v_table_name
when 'sbux_nc_request' then concat('where request_time between ',"'",v_same_date_last_period,"'", ' and ',"'", v_current_date,"'")
when 'sbux_nc_edm_message' then concat('where send_time between ',"'",v_same_date_last_period,"'", ' and ',"'", v_current_date,"'")
when 'sbux_nc_mail_message' then concat('where send_time between ',"'",v_same_date_last_period, "'",' and ',"'", v_current_date,"'")
when 'sbux_nc_push_message' then concat('where send_time between ',"'",v_same_date_last_period, "'",' and ',"'", v_current_date,"'")
when 'sbux_nc_sms_message' then concat('where send_time between ',"'",v_same_date_last_period, "'",' and ',"'", v_current_date,"'")
when 'sbux_nc_wechat_message' then concat('where send_time between ',"'",v_same_date_last_period, "'",' and ',"'", v_current_date,"'")
when 'sbux_nc_sys_log' then concat('where log_time between ',"'",v_same_date_last_period,"'", ' and ',"'", v_current_date,"'")
when 'sbux_nc_edm_log' then concat('where log_time between ',UNIX_TIMESTAMP(v_same_date_last_period), ' and ', UNIX_TIMESTAMP(v_current_date))
when 'sbux_nc_mail_log' then concat('where log_time between ',UNIX_TIMESTAMP(v_same_date_last_period), ' and ', UNIX_TIMESTAMP(v_current_date))
when 'sbux_nc_push_log' then concat('where log_time between ',UNIX_TIMESTAMP(v_same_date_last_period), ' and ', UNIX_TIMESTAMP(v_current_date))
when 'sbux_nc_sms_log' then concat('where log_time between ',UNIX_TIMESTAMP(v_same_date_last_period), ' and ', UNIX_TIMESTAMP(v_current_date))
when 'sbux_nc_wechat_log' then concat('where log_time between ',UNIX_TIMESTAMP(v_same_date_last_period), ' and ', UNIX_TIMESTAMP(v_current_date))
else NULL
end;
# 保存最近一个月的数据到文件
SET @stmt = CONCAT('select * into outfile ',"'", v_file_path, v_table_name,'.dat ', "'", ' ', v_separator, ' from ',v_table_name, ' ', @condition,';');
PREPARE stmt FROM @stmt;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
#获取表的最大增增长列并
select auto_increment into v_auto_increment
from information_schema.TABLES
where table_schema='starbucks'
and table_name=v_table_name;
# 删除原来数据
SET @stmt = CONCAT('truncate table ',v_table_name,';');
PREPARE stmt FROM @stmt;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
#设置下一个增量值
SET @stmt = CONCAT('alter table ',v_table_name,' auto_increment=',v_auto_increment,';');
PREPARE stmt FROM @stmt;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
# 加载数据到历史数据表中
# SET @stmt = CONCAT('LOAD DATA INFILE ',"'", v_file_path, v_table_name,'_hist.dat', "'", ' INTO TABLE ', v_table_name,'_hist',' ', v_separator);
# PREPARE stmt FROM @stmt;
# EXECUTE stmt;
# DEALLOCATE PREPARE stmt;
# 设置之前导出的表的数据文件（路径+文件名）
SET v_file = concat(v_file_path,v_table_name,'_hist.dat');
# 执行mysql UFF函数调用shell脚本把数据导入到历史表中
set @v_load_str = concat('sh /var/lib/mysql-files/load_data_infile.sh',' ',v_file,' ',CONCAT(v_table_name,'_hist'));
select sys_exec(@v_load_str) into v_flag;
# 把最近一个月的数据保存到原表中
# SET @stmt = CONCAT('LOAD DATA INFILE ',"'", v_file_path, v_table_name,'.dat ',"'",' INTO TABLE ',v_table_name,' ', v_separator);
# PREPARE stmt FROM @stmt;
# EXECUTE stmt;
# DEALLOCATE PREPARE stmt;
# 设置之前导出的表的近一个月数据文件（路径+文件名）
SET v_file = concat(v_file_path,v_table_name,'.dat');
# 执行mysql UFF函数调用shell脚本把数据导入到原表中
set @v_load_str = concat('sh /var/lib/mysql-files/load_data_infile.sh',' ',v_file,' ',v_table_name);
select sys_exec(@v_load_str) into v_flag;
# 收集（分析）表的数据
SET @stmt = CONCAT('analyze table ',v_table_name,';');
PREPARE stmt FROM @stmt;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
FETCH cur_table_list INTO v_table_name,v_engine,v_create_options;
END WHILE;
CLOSE cur_table_list;
END;
//
delimiter ; //
9.2.新建event,用来定时执行
/*======================================================================================== */
-- Name: sbux_nc_auto_migrate_evt
-- Purpose: 定时任务，自动备份表数据
-- Interval: Monthly
-- AT: 每个月1号凌晨2点
-- Invoker: sbux_nc_data_migrate_p
/*======================================================================================== */
set GLOBAL event_scheduler=1; # MySQL启动event scheduler
drop event if exists sbux_nc_auto_migrate_evt; # 在创建event scheduler前删除已存在的同名的event scheduler.
delimiter // ;
create event sbux_nc_auto_migrate_evt
ON SCHEDULE EVERY 1 DAY STARTS date_add(date(curdate() + 1),interval 2 hour) #MONTH STARTS DATE_ADD(DATE_ADD(DATE_SUB(CURDATE(),INTERVAL DAY(CURDATE())-1 DAY), INTERVAL 1 MONTH),INTERVAL 2 HOUR) -- 每个月的一号凌晨2点
ON completion preserve
ENABLE
DO
call sbux_nc_data_migrate_p();
//
delimiter ; //
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