mysql 动态新建以及删除分区表

drop procedure if exists general_procedure;
-- general_procedure的作用：新建分区表及在table_fen_qu表中存储新建分区表时的相关参数
-- general_procedure的参数：表名，分区表之间的时间间隔(单位为小时)，要新增的分区表个数
create procedure general_procedure(in tablenamein varchar(50),in intervalHour int,in newIntervalNum int)
general_pro:begin
    -- 参数：最大时间
    declare maxMonitTime datetime default SYSDATE();
    -- 参数：最大时间对应的字符串
    declare maxMonitTimeStr varchar(50);
    -- 参数：最小时间
    declare minMonitTime datetime default SYSDATE();
    -- 参数：最大时间对应的字符串
    declare minMonitTimeStr varchar(50);
    -- 参数：数据库记录数
    declare recoidNum int default 0;
    -- 判断传入的表名是否为空
    if tablenamein is null then
        leave general_pro;
    end if;
    -- 判断传入的时间间隔
    if intervalHour <= 0 then
        set intervalHour = 6;
    end if;
    -- 判断新增分区表个数
    if newIntervalNum <= 0 then
        set newIntervalNum = 1;
    end if;
 
    -- 在该表中，查询符合条件的记录数，backupflag=0说明是未备份
    select count(*) into recoidNum from table_fen_qu where tablename=tablenamein and backupflag=0;
    if recoidNum > 0 then
        -- 查询该表在table_fen_qu表中的最大监测时间
        select monittime into maxMonitTime from table_fen_qu where tablename=tablenamein and backupflag=0 order by monittime desc limit 1;
        -- 判断监测时间是否为null
        if maxMonitTime is null then
            set maxMonitTime = SYSDATE();
        end if;
        -- 比较最大时间减去72个小时之后的时间与系统时间的早晚
        set recoidNum = timestampdiff(hour,SYSDATE(),DATE_SUB(maxMonitTime,INTERVAL 3 DAY));
        -- 如果recoidNum大于0，说明最大监测时间减去72小时之后的时间仍然在系统时间之后,
        -- 说明不用建立新的分区表，反之，则建立最大监测时间之后newIntervalNum个以每intervalHour小时为间隔的分区表
        if recoidNum <= 0 then
            set recoidNum = 1; 
            while recoidNum <= newIntervalNum do 
                set maxMonitTime = ADDDATE(maxMonitTime,INTERVAL intervalHour HOUR);
                set maxMonitTimeStr = CONCAT('p',DATE_FORMAT(maxMonitTime,"%Y%m%d%H%i%s"));
                -- 开始添加分区表
                -- 拼接分区表代码段
                set @v_add_s = CONCAT('ALTER TABLE ',tablenamein,' ADD PARTITION  (PARTITION ',maxMonitTimeStr,' VALUES LESS THAN (\'',maxMonitTime,'\') ENGINE = InnoDB )');
                -- 定义预处理语句  
                prepare stmt from @v_add_s;
                -- 执行预处理语句
                execute stmt; 
                -- 释放预处理语句 
                deallocate prepare stmt;
                -- 开始在table_fen_qu中添加记录
                insert into table_fen_qu(fenquname,tablename,monittime,backupflag) VALUES(maxMonitTimeStr,tablenamein,maxMonitTime,0);
                -- 记录数加1
                set recoidNum = recoidNum + 1;
            end while;
        end if;
    else
        set recoidNum = 2; 
        -- 计算最小时间
        set minMonitTimeStr = CONCAT(DATE_FORMAT(DATE_SUB(maxMonitTime,INTERVAL 60 DAY),'%Y-%m-%d'),' 00:00:00');
        set minMonitTime = STR_TO_DATE(minMonitTimeStr,'%Y-%m-%d %H:%i:%s');
        -- 计算最大时间 hovertree.com
        set maxMonitTimeStr = CONCAT(DATE_FORMAT(ADDDATE(maxMonitTime,INTERVAL 4 DAY),'%Y-%m-%d'),' 00:00:00');
        set maxMonitTime = STR_TO_DATE(maxMonitTimeStr,'%Y-%m-%d %H:%i:%s');
        -- 计算新建表分区个数
        set newIntervalNum = floor(timestampdiff(hour,minMonitTime,maxMonitTime) / intervalHour) + 1;
        if newIntervalNum < 12 then
            set newIntervalNum = 12;
        end if;
        -- 删除所有表分区
        set @v_del_s = CONCAT('ALTER TABLE ',tablenamein,' remove partitioning');
        -- 定义预处理语句  
        prepare stmt from @v_del_s;
        -- 执行预处理语句
        execute stmt; 
        -- 释放预处理语句 
        deallocate prepare stmt;
        -- 删除所有数据
        delete from table_fen_qu where tablename= tablenamein;
        -- 新建分区
        -- 设置时间
        set minMonitTimeStr = CONCAT('p',DATE_FORMAT(minMonitTime,"%Y%m%d%H%i%s"));
        -- 拼接添加分区表sql
        set @v_add_s = CONCAT('ALTER TABLE ',tablenamein,' PARTITION BY RANGE COLUMNS(moint_time) (PARTITION ',minMonitTimeStr,' VALUES LESS THAN (\'',minMonitTime,'\') ENGINE = InnoDB,');
        -- 开始在table_fen_qu中添加记录
        insert into table_fen_qu(fenquname,tablename,monittime,backupflag) VALUES(minMonitTimeStr,tablenamein,minMonitTime,0);
        while recoidNum <= newIntervalNum do 
            -- 设置时间
            set minMonitTime = ADDDATE(minMonitTime,INTERVAL intervalHour HOUR);
            set minMonitTimeStr = CONCAT('p',DATE_FORMAT(minMonitTime,"%Y%m%d%H%i%s"));
            -- 拼接添加分区表sql
            set @v_add_s = CONCAT(@v_add_s,'PARTITION ',minMonitTimeStr,' VALUES LESS THAN (\'',minMonitTime,'\') ENGINE = InnoDB,');
            -- 开始在table_fen_qu中添加记录
            insert into table_fen_qu(fenquname,tablename,monittime,backupflag) VALUES(minMonitTimeStr,tablenamein,minMonitTime,0);
            -- 记录数加1
            set recoidNum = recoidNum + 1;
        end while;
        set @v_add_s = left(@v_add_s,LENGTH(@v_add_s)-1);
        set @v_add_s = CONCAT(@v_add_s,');');
        -- 定义预处理语句  
        prepare stmt from @v_add_s;
        -- 执行预处理语句 http://www.cnblogs.com/roucheng/
        execute stmt; 
        -- 释放预处理语句 
        deallocate prepare stmt;
    end if;
end general_pro;

-- 打开事件计划
SET GLOBAL event_scheduler = ON;
/*创建从开始时间每隔1天定时执行*/
drop event if exists eachDayEvent;
DELIMITER ||
create event eachDayEvent
    on schedule every 1 day  starts '2013-05-01 00:00:00'
    on completion preserve enable
do 
    begin
        -- general_procedure的参数：表名，分区表之间的时间间隔(单位为小时)，要新增的分区表个数
        -- 非能耗5分钟表-间隔6小时-6h/分区表 hovertree.com
        call general_procedure('no_energy_five_minute_data',6,8);
        -- 原始数据表-间隔6小时-6h/分区表
        call general_procedure('temp_data',6,8);
        -- 能耗五分钟-间隔天-24h/分区表
        call general_procedure('energy_five_minute_data',24,4);
        -- 能耗五分钟汇总-间隔天-24h/分区表
        call general_procedure('energy_five_minute_data_summarize',24,4);
        -- 能耗小时表调用-间隔周-7*24h/分区表 何问起
        call general_procedure('energy_hour_data_summarize',168,4);
        -- 能耗分类分项5分钟表-间隔周7*24h/分区表
        call general_procedure('energy_item_five_minute_data',168,4);
        -- 能耗分类分项小时表-间隔季度-90*24h/分区表
        call general_procedure('energy_item_hour_data',2160,4);
        -- 能耗天汇总表-间隔半年-4380h/分区表
        call general_procedure('energy_day_data_summarize',4380,4);
        -- 删除已备份的分区表 http://www.cnblogs.com/roucheng/
        call del_fenqu();
    end ||
DELIMITER ;