mysql大数据（1）---存储过程构建大数据

/*部门表*/
CREATE TABLE dept( 
 id INT UNSIGNED PRIMARY KEY AUTO_INCREMENT,  /*id*/
 deptno MEDIUMINT UNSIGNED NOT NULL DEFAULT 0, /*编号*/
 dname VARCHAR(20) NOT NULL DEFAULT "",/*名称*/
 loc VARCHAR(13) NOT NULL DEFAULT "" /*地点*/
)ENGINE=MyISAM DEFAULT CHARSET=utf8;

/*EMP雇员表*/
CREATE TABLE emp( 
  id INT UNSIGNED PRIMARY KEY AUTO_INCREMENT,  /*id*/
  empno MEDIUMINT UNSIGNED NOT NULL DEFAULT 0,/*编号*/
  ename VARCHAR(20) NOT NULL DEFAULT "",/*名字*/
  job VARCHAR(9) NOT NULL DEFAULT "",/*工作*/
  mgr MEDIUMINT UNSIGNED NOT NULL DEFAULT 0,/*是哪个及编号*/
  hiredate DATE NOT NULL,/*入职时间*/
  sal DECIMAL(7,2) NOT NULL,/*薪水*/
  comm DECIMAL(7,2) NOT NULL,/*红利*/
  deptno MEDIUMINT UNSIGNED NOT NULL DEFAULT 0 /*部门编号*/
)ENGINE=MyISAM DEFAULT CHARSET=utf8;

/*工资级别表*/
CREATE TABLE salgrade( 
 grade MEDIUMINT UNSIGNED NOT NULL DEFAULT 0,
 losal DECIMAL(17,2) NOT NULL,
 hisal DECIMAL(17,2) NOT NULL
)ENGINE=MyISAM DEFAULT CHARSET=utf8;


show variables like 'log_bin_trust_function_creators';
set global log_bin_trust_function_creators = 1; 
-- 注意命令结束符



#定义一个新的命令结束符
delimiter $$
#rand_string(n INT) rand_string 是函数名(n INT)  //该函数传参一个整数
create function rand_string(n INT)
returns varchar(255) 
begin
declare chars_str varchar(100) default 
 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
declare return_str varchar(255) default '';
declare i int default 0;
while i < n do
 set return_str=concat(return_str,substring(chars_str,floor(1+rand()*52),1));
 set i = i +1;
 end while;
return return_str;
end $$



#定义一个新的命令结束符
delimiter $$
-- 生成部门号函数
create function rand_num( )
returns int(5)
begin
 declare i int default 0;
 set i = floor(10+rand()*500);
return i;
 end $$



#定义一个新的命令结束符
delimiter $$
create procedure insert_emp(in start int(10),in max_num int(10))
begin
declare i int default 0;
#set autocommit = 0  //把autocommit设置成0，这样可以只提交一次，否则。。。。。
set autocommit = 0;
repeat
set i = i +1;
insert into emp (empno, ename,job,mgr,hiredate,sal,comm,deptno) values ((start+i),rand_string(6),'SALESMAN',0001,curdate(),2000,400,rand_num());
until i = max_num
end repeat;
commit;
end $$



call insert_emp(100001,5000000);