1. 准备测试表
CREATE TABLE `username` ( `uid` INT( 11 ) UNSIGNED NOT NULL default 1235678901, `username` VARCHAR( 20 ) , `email` VARCHAR( 30 ) , `password` VARCHAR( 32 ) , `birthday` date, `gender` VARCHAR(10) , avatar MEDIUMBLOB, PRIMARY KEY ( `uid` ) ) ENGINE = INNODB DEFAULT CHARSET=utf8; |
2. 随机生成数据
MySQL里面自带一个随机数生成的函数RAND()，它能生成0-1的浮点数
RAND函数生成随机数：
详解MySQL如何按表创建<span><span><span><i dp-xml
SET GLOBAL log_bin_trust_function_creators = 1;
CREATE DEFINER = `root` @`%` FUNCTION `rand_string` ( n INT ) RETURNS VARCHAR ( 255 ) CHARSET utf8 BEGIN
DECLARE
chars_str VARCHAR ( 100 ) DEFAULT 'hwbtestABCDEFG23141HIJ6712dfghjkqwevbnqmwerqwerqwreqw214123e1214c12dssaf89';
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( ) * 80 ), 1 ) );
SET ii = i + 1;
END WHILE;
RETURN return_str;
END;
详解MySQL如何按表创建<span><span><span><i @qq.com')</p>
<p><strong>4. 随机生成DATE和DATETIME类型</strong></p>
<p>(1) DATE类型</p>
<pre><ol class=
CREATE DEFINER = `root` @`%` FUNCTION `randDate` ( ) RETURNS VARCHAR ( 255 ) CHARSET utf8 BEGIN
DECLARE
aDate CHAR ( 10 ) DEFAULT '';
/*CONCAT (1949 + FLOOR( ( RAND( ) * 70 ) ) 表示 1949到2019的随机数据
--L PAD ( FLOOR( 1 + ( RAND( ) * 12 ) ), 2, 0 ) 表示月份的生成，小于 10自动补0
--L PAD ( FLOOR( 3 + ( RAND( ) * 8 ) ), 2, 0 ) ) 表示 3号到10号的随机数据 */
SET aDate = CONCAT(
1949 + FLOOR( ( RAND( ) * 70 ) ),
'-',
LPAD( FLOOR( 1 + ( RAND( ) * 12 ) ), 2, 0 ),
'-',
LPAD( FLOOR( 3 + ( RAND( ) * 8 ) ), 2, 0 )
);
RETURN aDate;
END;
详解MySQL如何按表创建<span><span><span><i dp-xml
Returns the string str:str, left-padded with the string padstr to a length of len characters.
If str is longer than len:N, the return value is shortened to len characters.
mysql> SELECT LPAD('hi',4,'??');
-> '??hi'
mysql> SELECT LPAD('hi',1,'??');
-> 'h'
(2) DATETIME类型
在刚刚写好的randDate上进行改造：
CREATE DEFINER = `root` @`%` FUNCTION `randDateTime` ( ) RETURNS VARCHAR ( 255 ) CHARSET utf8 BEGIN DECLARE aDateTime CHAR ( 19 ) DEFAULT ''; SET aDateTime = CONCAT( CONCAT( 1949 + FLOOR( ( RAND( ) * 70 ) ), '-', LPAD( FLOOR( 1 + ( RAND( ) * 12 ) ), 2, 0 ), '-', LPAD( FLOOR( 3 + ( RAND( ) * 8 ) ), 2, 0 ) ), ' ', CONCAT( LPAD( FLOOR( 0 + ( RAND( ) * 23 ) ), 2, 0 ), ':', LPAD( FLOOR( 0 + ( RAND( ) * 60 ) ), 2, 0 ), ':', LPAD( FLOOR( 0 + ( RAND( ) * 60 ) ), 2, 0 ) ) ); RETURN aDateTime; END; |
5. 将数据循环插入
定义将数据循环的存储过程：
DELIMITER // CREATE PROCEDURE insertUser ( ) BEGIN DECLARE num INT; SET num = 1; WHILE num < 100000 DO INSERT INTO username ( uid,username, email, PASSWORD, birthday, gender, avatar ) VALUES ( num, rand_string ( 15 ), concat( rand_string ( 5 ), '@qq.com' ), rand_string ( 32 ), randDate ( ), '男', NULL ); SET numnum = num + 1; END WHILE; commit; END; // |
调用存储过程：
| CALL insertUser; |
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