MySQL自增序列-亲试ok

#1.创建sequence表，公共的

DROP TABLE IF EXISTS sequence;
CREATE TABLE sequence (
     name VARCHAR(30) NOT NULL,    #序列名               
     current_value INT NOT NULL,   #当前值
     increment INT NOT NULL DEFAULT 1,  #增值  
     PRIMARY KEY (name)
) ENGINE=InnoDB;


#2.创建取当前值的函数
DROP FUNCTION IF EXISTS currval_fphm;
DELIMITER $
CREATE FUNCTION currval_fphm (seq_name VARCHAR(30))            
     RETURNS INTEGER
     LANGUAGE SQL
     DETERMINISTIC
     CONTAINS SQL
     SQL SECURITY DEFINER
     COMMENT ''
BEGIN

     DECLARE value INTEGER;
     SET value = 0;
     SELECT current_value INTO value
          FROM sequence
          WHERE name = seq_name;
     RETURN value;
END ;

#3.创建取下一值的函数
DROP FUNCTION IF EXISTS nextval_fphm;
DELIMITER $
CREATE FUNCTION nextval_fphm (seq_name VARCHAR(50))
     RETURNS INTEGER
     LANGUAGE SQL
     DETERMINISTIC
     CONTAINS SQL
     SQL SECURITY DEFINER
     COMMENT ''
BEGIN
     UPDATE sequence
          SET current_value = current_value + increment
          WHERE name = seq_name;
     RETURN currval_fphm(seq_name);
END ;

#4.创建更新值的函数
DROP FUNCTION IF EXISTS setval_fphm;
DELIMITER $
CREATE FUNCTION setval_fphm (seq_name VARCHAR(50), value INTEGER)
     RETURNS INTEGER
     LANGUAGE SQL
     DETERMINISTIC
     CONTAINS SQL
     SQL SECURITY DEFINER
     COMMENT ''
BEGIN
     UPDATE sequence
          SET current_value = value
          WHERE name = seq_name;
     RETURN currval_fphm(seq_name);
END;


#插入基本数据
INSERT INTO sequence VALUES ('item_fphm', 0, 1);  

#更新序列的当前值
SELECT SETVAL_fphm('item_fphm', 10000000);    



#使用示例
SELECT currval_fphm('item_fphm');                    
SELECT nextval_fphm('item_fphm');   


select 99999999-nextval_fphm('item_fphm')

create table pj_zzspdz_fpmx01 as select * from pj_zzspdz_fpmx where 1=2;

日期增量值 为  内
总的数据量为 5000w，故外循环5000w/15=3333333