升级到MySQL5.7版本需注意的问题

1）在一个无符号列中插入一个负值
创建具有无符号列的表：CREATE TABLE test (id int unsigned);
插入负值。
以前版本：INSERT INTO test VALUES (-1);
Query OK, 1 row affected, 1 warning (0.01 sec)

MySQL 5.7版本：
INSERT INTO test VALUES (-1);
ERROR 1264 (22003): Out of range value for column 'a' at row 1

2）除以零
创建测试表：CREATE TABLE test2 ( id int unsigned );

尝试除以零。
先前版本：INSERT INTO test2 VALUES (0/0);
Query OK, 1 row affected (0.01 sec)

MySQL 5.7版本：INSERT INTO test2 VALUES (0/0);
ERROR 1365 (22012): Division by 0

3）在10个字符的列中插入20个字符的字符串
创建一个包含10个字符的列的表：CREATE TABLE test3 ( a varchar(10) );

尝试插入较长的字符串。
先前版本：INSERT INTO test3 VALUES ('abcdefghijklmnopqrstuvwxyz');
Query OK, 1 row affected, 1 warning (0.00 sec)

MySQL 5.7版本：INSERT INTO test3 VALUES ('abcdefghijklmnopqrstuvwxyz');
ERROR 1406 (22001): Data too long for column 'a' at row 1

4）将非标准零日期插入日期时间列
创建具有datetime列的表：CREATE TABLE test3 ( a datetime );

插入0000-00-00 00:00:00。
先前版本：INSERT INTO test3 VALUES ('0000-00-00 00:00:00');
Query OK, 1 row affected, 1 warning (0.00 sec)

MySQL 5.7版本：INSERT INTO test3 VALUES ('0000-00-00 00:00:00');
ERROR 1292 (22007): Incorrect datetime value: '0000-00-00 00:00:00' for column 'a' at row 1

5）使用GROUP BY并选择一个不明确的列
发生这种情况时的说明不是一部分GROUP BY，并且没有聚集函数（例如MIN或MAX）施加到其上。
先前版本：SELECT id, invoice_id, description FROM invoice_line_items GROUP BY invoice_id;
+----+------------+-------------+
| id | invoice_id | description |
+----+------------+-------------+
| 1 | 1 | New socks |
| 3 | 2 | Shoes |
| 5 | 3 | Tie |
+----+------------+-------------+
3 rows in set (0.00 sec)

MySQL 5.7版本：SELECT id, invoice_id, description FROM invoice_line_items GROUP BY invoice_id;
ERROR 1055 (42000): Expression #3 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'invoice_line_items.description' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

5）mysql5.7版本SQL_MODE
默认情况下，MySQL 5.7包含以下模式：
* ONLY_FULL_GROUP_BY
* STRICT_TRANS_TABLES
* NO_ENGINE_SUBSTITUTION
* NO_AUTO_CREATE_USER

该模式STRICT_TRANS_TABLES也变得更加严格，在mysql 5.7中，默认使用的是严格模式，有时候可能带来问题，

比如：
mysql> CREATE TABLE `events_t` (
-> `id` int(11) NOT NULL AUTO_INCREMENT,
-> `event_date` datetime NOT NULL,
-> `profile_id` int(11) DEFAULT NULL,
-> PRIMARY KEY (`id`),
-> KEY `event_date` (`event_date`),
-> KEY `profile_id` (`profile_id`)
-> ) ENGINE=InnoDB DEFAULT CHARSET=latin1
-> ;
Query OK, 0 rows affected (0.02 sec)
mysql> insert into events_t (profile_id) values (1);
ERROR 1364 (HY000): Field 'event_date' doesn't have a default value

这里日期就必须要有默认值，不能NULL，但：
mysql> alter table events_t change event_date event_date datetime NOT NULL default '0000-00-00 00:00:00';
ERROR 1067 (42000): Invalid default value for 'event_date'
mysql> alter table events_t change event_date event_date datetime NOT NULL default '2000-00-00 00:00:00';
ERROR 1067 (42000): Invalid default value for 'event_date'

也是不行的，必须要有真实日期默认
mysql> alter table events_t change event_date event_date datetime NOT NULL default '2000-01-01 00:00:00';
Query OK, 0 rows affected (0.00 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql> insert into events_t (profile_id) values (1);
Query OK, 1 row affected (0.00 sec)

因此只有日期格式改为timestamp，或者用NULL，或者在insert的时候用now()产生日期。

6）mysql-connector-java.Jar

Table2.1Summary of Connector/J Versions

Connector/J version

Driver Type

JDBC version

MySQL Server version

Status

5.1

4

3.0, 4.0, 4.1, 4.2

4.1, 5.0, 5.1, 5.5, 5.6, 5.7

Recommended version

5.0

4

3.0

4.1, 5.0

Released version

3.1

4

3.0

4.1, 5.0

Obsolete

3.0

4

3.0

3.x, 4.1

Obsolete

Table26.2MySQL Connector Versions and MySQL Server Versions

Connector

Connector version

MySQL Server version

Connector/C

6.1.0 GA

5.6, 5.5, 5.1, 5.0, 4.1

Connector/C++

1.0.5 GA

5.6, 5.5, 5.1

Connector/J

5.1.8

5.6, 5.5, 5.1, 5.0, 4.1

Connector/Net

6.5

5.6, 5.5, 5.1, 5.0

Connector/Net

6.4

5.6, 5.5, 5.1, 5.0

Connector/Net

6.3

5.6, 5.5, 5.1, 5.0

Connector/Net

6.2 (No longer supported)

5.6, 5.5, 5.1, 5.0

Connector/Net

6.1 (No longer supported)

5.6, 5.5, 5.1, 5.0

Connector/Net

6.0 (No longer supported)

5.6, 5.5, 5.1, 5.0

Connector/Net

5.2 (No longer supported)

5.6, 5.5, 5.1, 5.0

Connector/Net

1.0 (No longer supported)

5.0, 4.0

Connector/ODBC

5.1

5.6, 5.5, 5.1, 5.0, 4.1.1+

Connector/ODBC

3.51 (Unicode not supported)

5.6, 5.5, 5.1, 5.0, 4.1

Connector/Python

2.0

5.7, 5.6, 5.5

Connector/Python

1.2

5.7, 5.6, 5.5