用MYSQL的存儲過程創建百萬級測試數據表

1. 創建隨機字符串函數，便於創建名稱

2.  
   DROP function if EXISTS rand_string;
   #創建一個指定字符個數的函數
   create function rand_string(n INT)
   #返回字符串，注意：此處關鍵字是returns 而不是return
   returns varchar(255)
   BEGIN
       #定義一個臨時變量，給變量賦值'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
       DECLARE chars_str varchar(100) DEFAULT 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
       # 定義返回結果字符串
       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
   
   

   創建隨機編號生成函數

   drop function if exists rand_num;
   CREATE function rand_num()
   returns int(5)
   BEGIN
   	DECLARE i int default 0;
   	set i = FLOOR(10+RAND()*500);
   	return i;
   END
   
   

3. 創建數據表 -- 部門表 dept

   drop table if EXISTS dept;
   create table dept (
   	deptno MEDIUMINT UNSIGNED not null DEFAULT 0,
     dname varchar(20) default '',
   	ioc varchar(13) default''
   ) ENGINE = myisam default CHARSET ='utf8';
   ALTER table dept add PRIMARY key(deptno);
   
   

4. 創建數據表 -- 員工表 emp

   drop table if EXISTS emp;
   CREATE TABLE `emp` (
     `empno` mediumint(8) unsigned NOT NULL DEFAULT '0',
     `ename` varchar(20) NOT NULL DEFAULT '',
     `job` varchar(9) NOT NULL DEFAULT '',
     `mgr` mediumint(8) unsigned NOT NULL DEFAULT '0' COMMENT '上級編號',
     `hiredate` date NOT NULL COMMENT '入職日期',
     `salary` decimal(7,2) NOT NULL COMMENT '薪水',
     `comm` decimal(7,2) NOT NULL COMMENT '紅利',
     `deptno` mediumint(8) unsigned NOT NULL DEFAULT '0' COMMENT '部門編號'
   ) ENGINE=MYISAM DEFAULT CHARSET=utf8;
   
   

5. 創建插入測試數據的存儲過程

   drop PROCEDURE IF EXISTS insert_emp ;
    
   CREATE PROCEDURE insert_emp (in start_no int(10),in max_num int(10))
    
   BEGIN
   	DECLARE i int default 0;
   	# 設置自動提交為false
   	set autocommit =0;
   	# 開啟循環
   	REPEAT
   		set i = i+1;
   		insert into emp values((start_no+i),rand_string(6),'SALESMAN',0001,CURDATE(),rand_num(),400,0002);
   	
   	UNTIL i=max_num
   	END REPEAT;
   END
   
   

6. 調用存儲過程，生成百萬數據

   call insert_emp(10000,10000000);