MySQL 用随机数据填充外键表

发布时间：2020-08-15 10:01:29 来源：ITPUB博客阅读：124 作者：壹頁書栏目：MySQL数据库

参考:
http://blog.itpub.net/29254281/viewspace-1686302/

准备环境
1.创建数字辅助表
create table nums(id int not null primary key);

delimiter $$
create procedure pFastCreateNums(cnt int)
begin
declare s int default 1;
truncate table nums;
insert into nums select s;
while s*2<=cnt do
insert into nums select id+s from nums;
set s=s*2;
end while;
end $$
delimiter ;

call pFastCreateNums(1000000);

数字辅助表的行数决定最后能生成的表行数的最大值.

2.创建生成随机字符的函数

DROP FUNCTION IF EXISTS rand_string;
delimiter //
CREATE FUNCTION rand_string(l_num int UNSIGNED,l_type tinyint UNSIGNED)
RETURNS varchar(2000)
BEGIN
-- Function : rand_string
-- Author : dbachina#dbachina.com
-- Date : 2010/5/30
-- l_num : The length of random string
-- l_type: The string type
-- 1.0-9
-- 2.a-z
-- 3.A-Z
-- 4.a-zA-Z
-- 5.0-9a-zA-Z
-- :
-- mysql> select rand_string(12,5) random_string;
-- +---------------+
-- | random_string |
-- +---------------+
-- | 3KzGJCUJUplw |
-- +---------------+
-- 1 row in set (0.00 sec)
DECLARE i int UNSIGNED DEFAULT 0;
DECLARE v_chars varchar(64) DEFAULT '0123456789';
DECLARE result varchar (2000) DEFAULT '';
IF l_type = 1 THEN
SET v_chars = '0123456789';
ELSEIF l_type = 2 THEN
SET v_chars = 'abcdefghijklmnopqrstuvwxyz';
ELSEIF l_type = 3 THEN
SET v_chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
ELSEIF l_type = 4 THEN
SET v_chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
ELSEIF l_type = 5 THEN
SET v_chars = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
ELSE
SET v_chars = '0123456789';
END IF;
WHILE i < l_num DO
SET result = concat( result,substr(v_chars,ceil(rand()*(length(v_chars)-1)),1) );
SET i = i + 1;
END WHILE;
RETURN result;
END;
//
delimiter ;

准备实验表.
先创建一些带有外键约束的表.数据库名称是 probe

CREATE TABLE `t_jvm_info` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`app_name` varchar(32) NOT NULL COMMENT '应用名称',
`host_name` varchar(32) NOT NULL COMMENT '主机名称',
`collect_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '采集时间',
`version` varchar(32) NOT NULL DEFAULT '' COMMENT 'jvm版本',
`vendor` varchar(32) NOT NULL DEFAULT '' COMMENT '厂商',
`java_home` varchar(64) NOT NULL DEFAULT '' COMMENT '客户端javahome路径',
`loaded_class_count` int(11) NOT NULL DEFAULT '-1' COMMENT '已经加载的类数量',
`unloaded_class_count` int(11) NOT NULL DEFAULT '-1' COMMENT '已经卸载的类数量',
`total_loaded_class_count` int(11) NOT NULL DEFAULT '-1' COMMENT '累计加载的类数量',
`heap_init` float NOT NULL DEFAULT '-1' COMMENT '堆内存初始大小',
`heap_committed` bigint(20) NOT NULL DEFAULT '-1' COMMENT 'os分配给jvm的堆内存',
`heap_max` bigint(20) NOT NULL DEFAULT '-1' COMMENT '堆内存上限',
`heap_used` bigint(20) NOT NULL DEFAULT '-1' COMMENT '已经使用的堆内存大小',
`non_heap_init` bigint(20) NOT NULL DEFAULT '-1' COMMENT '非堆内存初始大小',
`non_heap_committed` bigint(20) NOT NULL DEFAULT '-1' COMMENT 'os分配给jvm的非堆内存',
`non_heap_max` bigint(20) NOT NULL DEFAULT '-1' COMMENT '非堆内存上限',
`non_heap_used` bigint(20) NOT NULL DEFAULT '-1' COMMENT '已经使用的非堆内存大小',
`current_thread_count` int(11) NOT NULL DEFAULT '-1' COMMENT '当前jvm线程总数',
`total_started_thread_count` int(11) NOT NULL DEFAULT '-1' COMMENT '累计启动过的线程总数',
`peak_thread_count` int(11) NOT NULL DEFAULT '-1' COMMENT '线程数量最大值',
`daemon_thread_count` int(11) NOT NULL DEFAULT '-1' COMMENT 'daemon线程数量',
PRIMARY KEY (`id`),
KEY `app_name` (`app_name`,`host_name`,`collect_time`),
KEY `host_name` (`host_name`,`collect_time`)
) ENGINE=InnoDB AUTO_INCREMENT=2001 DEFAULT CHARSET=utf8mb4 COMMENT='jvm采集信息表';
CREATE TABLE `t_jvm_gc_info` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`t_jvm_info_id` bigint(20) NOT NULL COMMENT 'jvm采集信息表id',
`name` varchar(32) NOT NULL COMMENT 'gc类型名称',
`gctime` bigint(20) NOT NULL DEFAULT '-1' COMMENT 'gc时间',
`gccount` bigint(20) NOT NULL DEFAULT '-1' COMMENT 'gc次数',
PRIMARY KEY (`id`),
KEY `t_jvm_info_id` (`t_jvm_info_id`),
CONSTRAINT `t_jvm_gc_info_ibfk_1` FOREIGN KEY (`t_jvm_info_id`) REFERENCES `t_jvm_info` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=101 DEFAULT CHARSET=utf8mb4 COMMENT='jvm gc采集信息表';

创建可以自动生成数据的存储过程

drop procedure if exists auto_fill ;
delimiter $$
create procedure auto_fill(pDb varchar(32),pTableList varchar(1024))
begin
declare done int default 0;
declare v_dbName varchar(128);
declare v_fullTableName varchar(128);
declare v_tableName varchar(128);
declare v_rowCount int;
declare cur_test CURSOR for select dbName,fullTableName,tableName,rowCount from tmp_table_info;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
-- 临时表,用于保存拆分参数之后的结果.主要信息就是数据库名称和表名称
drop table if exists tmp_table_info;
create temporary table tmp_table_info
select pDb dbName,
concat(pDb,'.',substring_index ( value_str,',',1 )) fullTableName ,
substring_index ( value_str,',',1 ) tableName,
substring_index ( value_str,',',-1 ) rowCount
from (
select substring_index(substring_index(pTableList,';',b.id),';',-1) value_str
from
nums b
where b.id <= (length(pTableList) - length(replace(pTableList,';',''))+1)
) t1;
-- 禁用外键
SET FOREIGN_KEY_CHECKS=0;
open cur_test;
repeat
fetch cur_test into v_dbName,v_fullTableName,v_tableName,v_rowCount;
if done!=1 then
set @sql=concat('insert ignore into ',v_dbName,'.',v_tableName,' select ');
select
@sql:=concat(@sql,
case
when extra='auto_increment' then concat('id,')
when data_type='int' then if(rowCount is null,'round(rand()*2147483647),',concat('round(rand()*',rowCount,'),'))
when data_type='bigint' then if(rowCount is null,'round(rand()*9223372036854775807),',concat('round(rand()*',rowCount,'),'))
when data_type='smallint' then 'round(rand()*32767),'
when data_type='tinyint' then 'round(rand()*127 ),'
when data_type='varchar' then concat('rand_string(',CHARACTER_MAXIMUM_LENGTH,',5),')
when data_type='date' then 'now()-interval round(90*rand()) day,'
when data_type='datetime' then 'now()-interval round(90*rand()) day,'
when data_type='timestamp' then 'now()-interval round(90*rand()) day,'
when data_type in('double','float') then 'round(rand()*32767,5),'
when data_type like '%text%' then concat('rand_string(2048,5),')
end
) s
from (
select
k.referenced_table_name,
k.referenced_column_name,
c.table_schema,
c.table_name,
c.column_name,
c.data_type,
c.CHARACTER_MAXIMUM_LENGTH,
c.extra,
t.rowCount
from information_schema.columns c
left join information_schema.KEY_COLUMN_USAGE k on(
c.table_schema=k.table_schema and
c.table_name=k.table_name and
c.column_name=k.column_name and
k.constraint_name
in (select constraint_name from information_schema.REFERENTIAL_CONSTRAINTS)
)
left join tmp_table_info t on(t.dbName=k.table_schema and t.tableName=k.table_name)
where (c.table_schema,c.table_name) =(v_dbName,v_tableName)
order by c.ORDINAL_POSITION
) t2
;
set @sql=left(@sql,char_length(@sql)-1);
select nullif ('please stand by...',@sql:=concat(@sql,' from nums where id<=',v_rowCount,';')) info;
prepare statement from @sql;
execute statement;
commit;
end if;
until done end repeat;
close cur_test;
-- 恢复外键
SET FOREIGN_KEY_CHECKS=1;
end ;
$$
delimiter ;

执行存储过程填充数据

call auto_fill('probe','t_jvm_gc_info,100000;t_jvm_info,2000');

过程第一个参数是数据库名称
第二个参数是表名和行数的字符串列表.

测试数据生成自行删除外键约束即可

向AI问一下细节

MySQL 用随机数据填充外键表

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