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  • 2018.10.31 Mac下的Mysql修改字符编码修改的问题总结

    今天在弄数据库的时候发现存入中文汉字变成了问号,Mac跟windows处理方式不一样。

    show variables like '%char%';

    查看当前mysql的编码格式  也就是默认编码格式
    
    +--------------------------+-----------------------------------------------------------+
    | Variable_name            | Value                                                     |
    +--------------------------+-----------------------------------------------------------+
    | character_set_client     | utf8                                                      |
    | character_set_connection | utf8                                                      |
    | character_set_database   | lantin1                                                     |
    | character_set_filesystem | binary                                                    |
    | character_set_results    | utf8                                                      |
    | character_set_server     | latntin1                                                      |
    | character_set_system     | utf8                                                      |
    | character_sets_dir       | /usr/local/mysql-5.7.20-macos10.12-x86_64/share/charsets/ |
    +--------------------------+-----------------------------------------------------------+
    

    会发现有两个格式的编码不是utf8而是奇特格式的。现在我们就来修改数据库的默认编码格式

    步骤:

    1.关闭MySQL !!!!(在系统偏好设置里面关闭MySQL)

    2.终端进入 cd /usr/local/mysql/support-files 查看当前文件下是否存在my-default.cnf 因为我的是没有的情况的

    3.接下来我们先切换成超级用户的权限 sudo su 接着就输入 cd /etc 创建my.cnf 修改文件的权限 chmod 777 my.cnf

    4. 输入vim my.cnf 在复制粘贴下面的内容

    # Example MySQL config file for medium systems. 
    # 
    # This is for a system with little memory (32M - 64M) where MySQL plays 
    # an important part, or systems up to 128M where MySQL is used together with 
    # other programs (such as a web server) 
    # 
    # MySQL programs look for option files in a set of 
    # locations which depend on the deployment platform. 
    # You can copy this option file to one of those 
    # locations. For information about these locations, see: 
    # http://dev.mysql.com/doc/mysql/en/option-files.html 
    # 
    # In this file, you can use all long options that a program supports. 
    # If you want to know which options a program supports, run the program 
    # with the "--help" option. 
    # The following options will be passed to all MySQL clients 
    [client]
    default-character-set=utf8
    #password = your_password 
    port = 3306 
    socket = /tmp/mysql.sock 
    # Here follows entries for some specific programs 
    # The MySQL server 
    [mysqld]
    character-set-server=utf8
    init_connect='SET NAMES utf8
    port = 3306 
    socket = /tmp/mysql.sock 
    skip-external-locking 
    key_buffer_size = 16M 
    max_allowed_packet = 1M 
    table_open_cache = 64 
    sort_buffer_size = 512K 
    net_buffer_length = 8K 
    read_buffer_size = 256K 
    read_rnd_buffer_size = 512K 
    myisam_sort_buffer_size = 8M 
    character-set-server=utf8 
    init_connect='SET NAMES utf8' 
    # Don't listen on a TCP/IP port at all. This can be a security enhancement, 
    # if all processes that need to connect to mysqld run on the same host. 
    # All interaction with mysqld must be made via Unix sockets or named pipes. 
    # Note that using this option without enabling named pipes on Windows 
    # (via the "enable-named-pipe" option) will render mysqld useless! 
    # 
    #skip-networking
    
    # Replication Master Server (default) 
    # binary logging is required for replication 
    log-bin=mysql-bin
    
    # binary logging format - mixed recommended 
    binlog_format=mixed
    
    # required unique id between 1 and 2^32 - 1 
    # defaults to 1 if master-host is not set 
    # but will not function as a master if omitted 
    server-id = 1
    
    # Replication Slave (comment out master section to use this) 
    # 
    # To configure this host as a replication slave, you can choose between 
    # two methods : 
    # 
    # 1) Use the CHANGE MASTER TO command (fully described in our manual) - 
    # the syntax is: 
    # 
    # CHANGE MASTER TO MASTER_HOST=<host>, MASTER_PORT=<port>, 
    # MASTER_USER=<user>, MASTER_PASSWORD=<password> ; 
    # 
    # where you replace <host>, <user>, <password> by quoted strings and 
    # <port> by the master's port number (3306 by default). 
    # 
    # Example: 
    # 
    # CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=3306, 
    # MASTER_USER='joe', MASTER_PASSWORD='secret'; 
    # 
    # OR 
    # 
    # 2) Set the variables below. However, in case you choose this method, then 
    # start replication for the first time (even unsuccessfully, for example 
    # if you mistyped the password in master-password and the slave fails to 
    # connect), the slave will create a master.info file, and any later 
    # change in this file to the variables' values below will be ignored and 
    # overridden by the content of the master.info file, unless you shutdown 
    # the slave server, delete master.info and restart the slaver server. 
    # For that reason, you may want to leave the lines below untouched 
    # (commented) and instead use CHANGE MASTER TO (see above) 
    # 
    # required unique id between 2 and 2^32 - 1 
    # (and different from the master) 
    # defaults to 2 if master-host is set 
    # but will not function as a slave if omitted 
    #server-id = 2 
    # 
    # The replication master for this slave - required 
    #master-host = <hostname> 
    # 
    # The username the slave will use for authentication when connecting 
    # to the master - required 
    #master-user = <username> 
    # 
    # The password the slave will authenticate with when connecting to 
    # the master - required 
    #master-password = <password> 
    # 
    # The port the master is listening on. 
    # optional - defaults to 3306 
    #master-port = <port> 
    # 
    # binary logging - not required for slaves, but recommended 
    #log-bin=mysql-bin
    
    # Uncomment the following if you are using InnoDB tables 
    #innodb_data_home_dir = /usr/local/mysql/data 
    #innodb_data_file_path = ibdata1:10M:autoextend 
    #innodb_log_group_home_dir = /usr/local/mysql/data 
    # You can set .._buffer_pool_size up to 50 - 80 % 
    # of RAM but beware of setting memory usage too high 
    #innodb_buffer_pool_size = 16M 
    #innodb_additional_mem_pool_size = 2M 
    # Set .._log_file_size to 25 % of buffer pool size 
    #innodb_log_file_size = 5M 
    #innodb_log_buffer_size = 8M 
    #innodb_flush_log_at_trx_commit = 1 
    #innodb_lock_wait_timeout = 50
    
    [mysqldump] 
    quick 
    max_allowed_packet = 16M
    
    [mysql] 
    no-auto-rehash 
    # Remove the next comment character if you are not familiar with SQL 
    #safe-updates 
    default-character-set=utf8
    
    [myisamchk] 
    key_buffer_size = 20M 
    sort_buffer_size = 20M 
    read_buffer = 2M 
    write_buffer = 2M
    
    [mysqlhotcopy] 
    interactive-timeout
    

    注意第一个#号也是要的哦

    5. 保存并退出

    接下里输入完mysql -u root -p 之后出现下面的代码

    Warning: World-writable config file ‘/etc/my.cnf’ is ignored mysql担心这种文件被其他用户恶意修改,所以忽略掉这个配置文件。才知道说是不安全的所以读取不出来

    解决办法是修改my.cnf的文件权限 chmod 644 my.cnf

    ok

    查看一下

    mysql> show variables like '%char%';
    +--------------------------+-----------------------------------------------------------+
    | 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/local/mysql-5.7.20-macos10.12-x86_64/share/charsets/ |
    +--------------------------+-----------------------------------------------------------+
    
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  • 原文地址:https://www.cnblogs.com/qichunlin/p/9886669.html
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