CREATE TABLE `mytable` (
 `id` int(11) NOT NULL AUTO_INCREMENT,
 `name` varchar(20) NOT NULL,
 `content` text NOT NULL,
 PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

1.not null字段插入null值測試

插入一條記錄，name的值為null

在非嚴格模式下執(zhí)行

mysql> insert into mytable(content) values('programmer');
Query OK, 1 row affected, 1 warning (0.00 sec)

mysql> select * from mytable;
+----+------+------------+
| id | name | content    |
+----+------+------------+
|  1 |      | programmer |
+----+------+------------+
1 row in set (0.00 sec)

執(zhí)行成功，name的值自動轉(zhuǎn)為”

在嚴格模式下執(zhí)行

mysql> insert into mytable(content) values('programmer');
ERROR 1364 (HY000): Field 'name' doesn't have a default value

執(zhí)行失敗，提示字段name不能為null值

2.自增長字段插入”值測試

對id字段插入”值

在非嚴格模式下執(zhí)行

mysql> insert into mytable(id,name,content) value('','fdipzone','programmer');
Query OK, 1 row affected, 1 warning (0.00 sec)

mysql> select * from mytable;
+----+----------+------------+
| id | name     | content    |
+----+----------+------------+
|  1 | fdipzone | programmer |
+----+----------+------------+
1 row in set (0.00 sec)

執(zhí)行成功

在嚴格模式下執(zhí)行

mysql> insert into mytable(id,name,content) value('','fdipzone','programmer');
ERROR 1366 (HY000): Incorrect integer value: '' for column 'id' at row 1

執(zhí)行失敗，提示字段id不能為”

mysql> insert into mytable(id,name,content) value(null,'fdipzone','programmer');
Query OK, 1 row affected (0.00 sec)

mysql> select * from mytable;
+----+----------+------------+
| id | name     | content    |
+----+----------+------------+
|  1 | fdipzone | programmer |
+----+----------+------------+
1 row in set (0.00 sec)

字段id為null則可執(zhí)行成功

3.text字段默認值測試

創(chuàng)建一個數(shù)據(jù)表mytable，其中text設(shè)置默認值default=”

在非嚴格模式下執(zhí)行

mysql> CREATE TABLE `mytable` (
    ->  `id` int(11) NOT NULL AUTO_INCREMENT,
    ->  `name` varchar(20) NOT NULL,
    ->  `content` text NOT NULL default '',
    ->  PRIMARY KEY (`id`)
    -> ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Query OK, 0 rows affected, 1 warning (0.03 sec)

mysql> show tables;
+------------------------------+
| Tables_in_test_version       |
+------------------------------+
| mytable                      |
+------------------------------+

執(zhí)行成功

在嚴格模式下執(zhí)行

mysql> CREATE TABLE `mytable` (
    ->  `id` int(11) NOT NULL AUTO_INCREMENT,
    ->  `name` varchar(20) NOT NULL,
    ->  `content` text NOT NULL default '',
    ->  PRIMARY KEY (`id`)
    -> ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
ERROR 1101 (42000): BLOB/TEXT column 'content' can't have a default value

執(zhí)行失敗，提示content字段是TEXT類型，不能使用默認值。

總結(jié)，使用mysql嚴格模式可以使數(shù)據(jù)更加安全嚴格，缺點是減少了對空數(shù)據(jù)入庫的兼容性。建議開發(fā)環(huán)境使用嚴格模式以提高代碼的質(zhì)量及對數(shù)據(jù)的嚴謹性。