Ubuntu
进入mysql安装目录并找到配置文件, /etc/mysql/my.cnf文件
使用命令:
sudo vi my.cnf
进入修改配置文件,
1-在[client]节点下面添加
# 默认字符集为utf8default-character-set=utf8
2-在[mysqld] 节点下添加
# 默认字符集为utf8default-character-set=utf8 #设定连接mysql数据库时编码, 让mysql数据库为utf8运行init_connect='SETNAMES utf8'
修改好后,重启mysql 即可,查询一下
使用下面命令
show variables like 'character%';
+--------------------------+----------------------------+
| Variable_name| Value |
+--------------------------+----------------------------+
|character_set_client | utf8 |
| character_set_connection| utf8 |
|character_set_database | utf8 |
|character_set_filesystem | binary |
|character_set_results | utf8 |
|character_set_server | utf8 |
|character_set_system | utf8 |
|character_sets_dir | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
注:mysql 5.5
解决办法是在my.cnf文件的[mysqld]配置选项下添加如下内容, 就可以了。
character-set-server= utf8lower_case_table_names= 1

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Article discusses strategies for handling large datasets in MySQL, including partitioning, sharding, indexing, and query optimization.

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The article discusses dropping tables in MySQL using the DROP TABLE statement, emphasizing precautions and risks. It highlights that the action is irreversible without backups, detailing recovery methods and potential production environment hazards.

Article discusses using foreign keys to represent relationships in databases, focusing on best practices, data integrity, and common pitfalls to avoid.

The article discusses creating indexes on JSON columns in various databases like PostgreSQL, MySQL, and MongoDB to enhance query performance. It explains the syntax and benefits of indexing specific JSON paths, and lists supported database systems.

Article discusses securing MySQL against SQL injection and brute-force attacks using prepared statements, input validation, and strong password policies.(159 characters)


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