如何更改mysql中auto

查看db.table表的下一条记录auto_increment的值：

show table status from db like 'table'

例如：

mysql>show table status from mailbox like 'mailbox'

| Name| Engine | Version | Row_format | Rows | Avg_row_length | Data_length | Max_data_length | Index_length | Data_free |Auto_increment| Create_time |

Update_time | Check_time | Collation | Checksum | Create_options | Comment |

| mailbox | MyISAM | 10 | Dynamic| 1681 |148 | 249688 | 281474976710655 | 104448 | 0 | 15355| 2012-03-13 11:19:10 |

2012-03-13 11:19:10 | 2012-03-13 11:19:10 | latin1_swedish_ci | NULL ||

1 row in set (0.00 sec)

Auto_increment：15355

这个就是下一条记录会使用的自增ID；

修改db.table表下一条记录使用的自增ID值为20000：

alter table db.table auto_increment=20000

例如：

mysql>alter table mailbox.mailbox auto_increment=20000

Query OK, 1681 rows affected (0.05 sec)

这时再进行：

show table status from mailbox like 'mailbox'

auto_increment已经变成20000；

新插入的记录，自增字段就会从20000开始；

1．Starting MySQL.Manager of pid-file quit without updating fi[失败]

关于这个错误原因有很多，最大的可能是没有创建测试数据库，可以用/usr/local/mysql/scripts/mysql_install_db –user=mysql命令进行创建；另外一个原因可能是权限设置问题，需要赋予mysql的data权限，可以用chmod -R 命令。

2．FATAL ERROR: Could not find /home/mysql/bin/my_print_defaults If you are using a binary release,you must run this script from

within the directory the archive extracted into. If you compiled

MySQL yourself you must run ‘make install’ first.

这个错误，是没有指明mysql的data路径导致的，可以很简单的进行解决：

vim /etc/my.cnf

在[mysqld] 后面加上路径：

basedir = /usr/local/mysql

datadir =/opt/data；

3．-bash: mysql: command not found

用mysql命令进行登陆mysql报错，原因是没有设置环境变量，需要设置，或者进入到bin目录进行登陆cd /usr/local/mysql/bin

mysql -u root

4．ERROR 1130: Host ’192.168.1.3′ is not allowed to connect to this MySQL server

用mysql远程工具链接数据库报错，这个错误原因是没有开放远程链接功能，可以在mysql里面输入如下命令进行解决：GRANT ALL PRIVILEGES ON *.* TO ’root‘@’%' IDENTIFIED BY ’password’ WITH GRANT OPTION

当我用JDBC连接MySql数据库时，编译报了如下错误：错误1：Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.这要求我们注册驱动时，把Class.forName("com.mysql.jdbc.Driver")改成 Class.forName("com.mysql.cj.jdbc.Driver")当我信息满满的修改之后重新编译时，再次出现了错误：错误2：Fri Feb 22 08:55:38 CST 2019 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.这要求我们在设置url参数时，将useSSL=false，修改后 jdbc:mysql://localhost:3306/ds3?useSSL=false当我修改后，本以为这下应该没问题了，没想到，再一次出现了问题错误3：Exception in thread "main" java.sql.SQLException: The server time zone value 'Öйú±ê׼ʱ¼ä' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.这要求我们修改时区，修改成jdbc:mysql://localhost:3306/ds3?useSSL=false&serverTimezone=UTC终于，不在报错误了。错误4：当我们配置xml文件时，要把&转为其本身的转义字符配置properties文件的urlurl=jdbc:mysql:///ds3?useSSL=false&serverTimezone=UTC配置xml文件的url<property name="url">jdbc:mysql://localhost:3306/ds3?useSSL=false&serverTimezone=UTC</property>

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