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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
Table 2.1 Summary of Connector/J Versions
Connector/J version |
Driver Type |
JDBC version |
MySQL Server version |
Status |
---|---|---|---|---|
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 |
Table 26.2 MySQL Connector Versions and MySQL Server Versions
Connector |
Connector version |
MySQL Server version |
---|---|---|
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 |
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