mysql的sql_mode 模式修改 doesn't have a default value.

mysql 提示错误 doesn't have a default value.

今天遇到了mysql 提示错误 doesn't have a default value.

<h1>CDbException</h1>
<p>CDbCommand 无法执行 SQL 语句: SQLSTATE[HY000]: General error: 1364 Field 'sms_percent_amount' doesn't have a default value. The SQL statement executed was: INSERT INTO t_dev (`mail`, `passwd`, `name`,`reg_ip`,`git_id`,`status`) VALUES(:mail, :passwd, :name, :reg_ip,:git_id,:status);. Bound with mail='[e-mail]', passwd='e99a18c428cb38d5f260853678922e03', name='magic007', status=1, reg_ip='2130706433', git_id='2484137' (/Users/magic/Applications/web/cctv/yii/framework/db/CDbCommand.php:358)</p><pre>#0 /Users/magic/Applications/web/cctv/cctv-web/www.cctv.cn/protected/models/User.php(329): CDbCommand->execute(Array)
#1 /Users/magic/Applications/web/cctv/cctv-web/www.cctv.cn/protected/models/User.php(37): User->addRow(Array)
#2 /Users/magic/Applications/web/cctv/cctv-web/www.cctv.cn/protected/controllers/SiteController.php(398): User->register(Array)
#3 /Users/magic/Applications/web/cctv/yii/framework/web/actions/CInlineAction.php(49): SiteController->actionAuthRegister()
#4 /Users/magic/Applications/web/cctv/yii/framework/web/CController.php(308): CInlineAction->runWithParams(Array)
#5 /Users/magic/Applications/web/cctv/yii/framework/web/filters/CFilterChain.php(133): CController->runAction(Object(CInlineAction))
#6 /Users/magic/Applications/web/cctv/yii/framework/web/filters/CFilter.php(40): CFilterChain->run()
#7 /Users/magic/Applications/web/cctv/yii/framework/web/CController.php(1145): CFilter->filter(Object(CFilterChain))
#8 /Users/magic/Applications/web/cctv/yii/framework/web/filters/CInlineFilter.php(58): CController->filterAccessControl(Object(CFilterChain))
#9 /Users/magic/Applications/web/cctv/yii/framework/web/filters/CFilterChain.php(130): CInlineFilter->filter(Object(CFilterChain))
#10 /Users/magic/Applications/web/cctv/yii/framework/web/CController.php(291): CFilterChain->run()
#11 /Users/magic/Applications/web/cctv/yii/framework/web/CController.php(265): CController->runActionWithFilters(Object(CInlineAction), Array)
#12 /Users/magic/Applications/web/cctv/yii/framework/web/CWebApplication.php(282): CController->run('AuthRegister')
#13 /Users/magic/Applications/web/cctv/yii/framework/web/CWebApplication.php(141): CWebApplication->runController('site/AuthRegist...')
#14 /Users/magic/Applications/web/cctv/yii/framework/base/CApplication.php(185): CWebApplication->processRequest()
#15 /Users/magic/Applications/web/cctv/cctv-web/www.cctv.cn/index.php(24): CApplication->run()
#16 {main}</pre>

查看目前mysql使用模式

mysql> select @@sql_mode;

+--------------------------------------------+

| @@sql_mode                                 |

+--------------------------------------------+

| STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION |

+--------------------------------------------+

修改MySQL 模式
命令行修改  SET sql_mode = "NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION";

如果需要重启后修改，请修改my.conf

sql_mode= NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

关于sql_mode 介绍
1. sql_mode模式 
mysql数据库的中有一个环境变量sql_mode,定义了mysql应该支持的sql语法，数据校验等！我们可以通过以下方式查看当前数据库使用的sql_mode： 

mysql> show variables like 'sql_mode%'\G;
*************************** 1. row ***************************
Variable_name: sql_mode
        Value: STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

mysql5.0以上版本支持三种sql_mode模式：ANSI、TRADITIONAL和STRICT_TRANS_TABLES。 
ANSI模式：宽松模式，对插入数据进行校验，如果不符合定义类型或长度，对数据类型调整或截断保存，报warning警告。 
TRADITIONAL模式：严格模式，当向mysql数据库插入数据时，进行数据的严格校验，保证错误数据不能插入，报error错误。用于事物时，会进行事物的回滚。 
STRICT_TRANS_TABLES模式：严格模式，进行数据的严格校验，错误数据不能插入，报error错误。 

1.2 ANSI模式 

mysql> set @@sql_mode=ANSI;
Query OK, 0 rows affected (0.00 sec)

mysql> create table test(name varchar(4), pass varchar(4));
Query OK, 0 rows affected (0.03 sec)

mysql> insert into test values('aaaaa','aaaaa'),('bbbb','bbbb');
Query OK, 2 rows affected, 2 warnings (0.02 sec)
Records: 2  Duplicates: 0  Warnings: 2

mysql> show warnings;
+---------+------+-------------------------------------------+
| Level   | Code | Message                                   |
+---------+------+-------------------------------------------+
| Warning | 1265 | Data truncated for column 'name' at row 1 |
| Warning | 1265 | Data truncated for column 'pass' at row 1 |
+---------+------+-------------------------------------------+
2 rows in set (0.00 sec)

mysql> select * from test;
+------+------+
| name | pass |
+------+------+
| aaaa | aaaa |
| bbbb | bbbb |
+------+------+
2 rows in set (0.00 sec)

我们可以看到，在ANSI模式下，当我们插入数据时，未满足列长度要求时，数据同样会插入成功，但是对超出列长度的字段进行截断，同时报告warning警告。 

1.3 STRICT_TRANS_TABLES模式 

mysql> set @@sql_mode=TRADITIONAL;
Query OK, 0 rows affected (0.00 sec)

mysql> create table test(name varchar(4), pass varchar(4));
Query OK, 0 rows affected (0.02 sec)

mysql> insert into test values('aaaaa','aaaaa'),('bbbb','bbbb');
ERROR 1406 (22001): Data too long for column 'name' at row 1

mysql> show errors;
+-------+------+------------------------------------------+
| Level | Code | Message                                  |
+-------+------+------------------------------------------+
| Error | 1406 | Data too long for column 'name' at row 1 |
+-------+------+------------------------------------------+
1 row in set (0.00 sec)

mysql> select * from test;
Empty set (0.00 sec)

TRADITIONAL模式与STRICT_TRANS_TABLES模式执行的结果，在这种情况下一致。 

注意：我们这里设置的sql_mode都是session级别的。另外，可以直接修改my.ini文件，找到sql_mode，然后设置新的模式即可！

例如： 

    vi /etc/my.cnf

在[mysqld]下面添加如下列：

sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES