A brief introduction to the problem of zero values ​​in dates in MySQL databases

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By default, MySQL can accept inserting 0 values ​​into dates. In reality, 0 values ​​in dates have little meaning. Adjusting MySQL's sql_mode variable can achieve the goal.

set @@global.sql_mode='STRICT_TRANS_TABLES,NO_ZERO_DATE,NO_ENGINE_SUBSTITUTION';
set @@session.sql_mode='STRICT_TRANS_TABLES,NO_ZERO_DATE,NO_ENGINE_SUBSTITUTION';

Example:

There is a table for logging

create table app_logs(
id int not null auto_increment primary key,
log_tm timestamp not null,
log_info varchar(64) not null)
engine=innodb,charset=utf8;

Insert interesting date values ​​into the log table

insert into app_logs(log_tm,log_info) values(now(),'log_info_1');
insert into app_logs(log_tm,log_info) values('2016-12-01','log_info_2');

Insert date values ​​including 0 into the log table

insert into app_logs(log_tm,log_info) values('2016-12-00','log_info_2');
ERROR 1292 (22007): Incorrect datetime value: '2016-12-00' for column 'log_tm' at row 1

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