7 centos mysql中文乱码_【Linux】CentOS7中使用mysql,查询结果显示中文乱码的解决办法...

迷南。 2023-01-10 05:22 156阅读 0赞

1.登录mysql

mysql -u root -p

2.查看mysql字符集

mysql> show variables like 'chara%';

\+--------------------------+----------------------------+

| 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 | latinl |

| character\_set\_system | utf8 |

| character\_sets\_dir | /usr/share/mysql/charsets/ |

\+--------------------------+----------------------------+

3.改配置文件

进入 etc目录下打开 my.cnf 文件 ，对 my.cnf 进行修改，修改内容如下。

在\[mysqld\]前面加

\[client\]

default-character-set=utf8

在\[mysqld\]后面加

default-storage-engine=INNODB

character-set-server=utf8

collation-server=utf8\_general\_ci

演示:

\[root@bigboss ~\]\# vi /etc/my.cnf

\# For advice on how to change settings please see

\# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html

\[client\]

default-character-set=utf8

\[mysqld\]

\# Remove leading \# and set to the amount of RAM for the most important data

\# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.

\# innodb\_buffer\_pool\_size = 128M

\# Remove leading \# to turn on a very important data integrity option: logging

\# changes to the binary log between backups.

\# log\_bin

\# Remove leading \# to set options mainly useful for reporting servers.

\# The server defaults are faster for transactions and fast SELECTs.

\# Adjust sizes as needed, experiment to find the optimal values.

\# join\_buffer\_size = 128M

\# sort\_buffer\_size = 2M

\# read\_rnd\_buffer\_size = 2M

default-storage-engine=INNODB

character-set-server=utf8

collation-server=utf8\_general\_ci

4.重启mysql

systemctl restart mysqld.service

5.检查是否生效

登录mysql后查看

mysql> show variables like 'chara%';

\+--------------------------+----------------------------+

| 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/ |

\+--------------------------+----------------------------+

8 rows in set (0.01 sec)

其他乱码问题secureCRT显示乱码

![be2e410d180fbfd710e157ba63374ed8.png][]

使Windows系统mysql默认也是utf8编码

也是更改配置文件

![582ade826cbb2f5fba35e00e00e0080d.png][]

编辑my.ini跟上面的一样

在\[mysqld\]前面加

\[client\]

default-character-set=utf8

在\[mysqld\]后面加

default-storage-engine=INNODB

character-set-server=utf8

collation-server=utf8\_general\_ci

修改后结果如下:,然后重启mysql就生效了

\# MySQL Server Instance Configuration File

\# ----------------------------------------------------------------------

\# Generated by the MySQL Server Instance Configuration Wizard

\# Installation Instructions

\# ----------------------------------------------------------------------

\# On Linux you can copy this file to /etc/my.cnf to set global options,

\# mysql-data-dir/my.cnf to set server-specific options

\# (@localstatedir@ for this installation) or to

\# ~/.my.cnf to set user-specific options.

\# On Windows you should keep this file in the installation directory

\# of your server (e.g. C:\\Program Files\\MySQL\\MySQL Server X.Y). To

\# make sure the server reads the config file use the startup option

\# "--defaults-file".

\# To run run the server from the command line, execute this in a

\# command line shell, e.g.

\# mysqld --defaults-file="C:\\Program Files\\MySQL\\MySQL Server X.Y\\my.ini"

\# To install the server as a Windows service manually, execute this in a

\# command line shell, e.g.

\# mysqld --install MySQLXY --defaults-file="C:\\Program Files\\MySQL\\MySQL Server X.Y\\my.ini"

\# And then execute this in a command line shell to start the server, e.g.

\# net start MySQLXY

\# Guildlines for editing this file

\# ----------------------------------------------------------------------

\# In this file, you can use all long options that the program supports.

\# If you want to know the options a program supports, start the program

\# with the "--help" option.

\# More detailed information about the individual options can also be

\# found in the manual.

\# CLIENT SECTION

\# ----------------------------------------------------------------------

\# The following options will be read by MySQL client applications.

\# Note that only client applications shipped by MySQL are guaranteed

\# to read this section. If you want your own MySQL client program to

\# honor these values, you need to specify it as an option during the

\# MySQL client library initialization.

\[client\]

port=3306

default-character-set=utf8

\[mysql\]

\#default-character-set=latin1

default-character-set=utf8

\# SERVER SECTION

\# ----------------------------------------------------------------------

\# The following options will be read by the MySQL Server. Make sure that

\# you have installed the server correctly (see above) so it reads this

\# file.

\[mysqld\]

\# The TCP/IP Port the MySQL Server will listen on

port=3306

\#Path to installation directory. All paths are usually resolved relative to this.

basedir="C:/mysql/"

\#Path to the database root

datadir="C:/ProgramData/MySQL/MySQL Server 5.1/Data/"

\# The default character set that will be used when a new schema or table is

\# created and no character set is defined

\#character-set-server=latin1

default-character-set=utf8

\# The default storage engine that will be used when create new tables when

default-storage-engine=INNODB

\# Set the SQL mode to strict

sql-mode="STRICT\_TRANS\_TABLES,NO\_AUTO\_CREATE\_USER,NO\_ENGINE\_SUBSTITUTION"

\# The maximum amount of concurrent sessions the MySQL server will

\# allow. One of these connections will be reserved for a user with

\# SUPER privileges to allow the administrator to login even if the

\# connection limit has been reached.

max\_connections=100

\# Query cache is used to cache SELECT results and later return them

\# without actual executing the same query once again. Having the query

\# cache enabled may result in significant speed improvements, if your

\# have a lot of identical queries and rarely changing tables. See the

\# "Qcache\_lowmem\_prunes" status variable to check if the current value

\# is high enough for your load.

\# Note: In case your tables change very often or if your queries are

\# textually different every time, the query cache may result in a

\# slowdown instead of a performance improvement.

query\_cache\_size=0

\# The number of open tables for all threads. Increasing this value

\# increases the number of file descriptors that mysqld requires.

\# Therefore you have to make sure to set the amount of open files

\# allowed to at least 4096 in the variable "open-files-limit" in

\# section \[mysqld\_safe\]

table\_cache=256

\# Maximum size for internal (in-memory) temporary tables. If a table

\# grows larger than this value, it is automatically converted to disk

\# based table This limitation is for a single table. There can be many

\# of them.

tmp\_table\_size=34M

\# How many threads we should keep in a cache for reuse. When a client

\# disconnects, the client's threads are put in the cache if there aren't

\# more than thread\_cache\_size threads from before. This greatly reduces

\# the amount of thread creations needed if you have a lot of new

\# connections. (Normally this doesn't give a notable performance

\# improvement if you have a good thread implementation.)

thread\_cache\_size=8

\#\*\*\* MyISAM Specific options

\# The maximum size of the temporary file MySQL is allowed to use while

\# recreating the index (during REPAIR, ALTER TABLE or LOAD DATA INFILE.

\# If the file-size would be bigger than this, the index will be created

\# through the key cache (which is slower).

myisam\_max\_sort\_file\_size=100G

\# If the temporary file used for fast index creation would be bigger

\# than using the key cache by the amount specified here, then prefer the

\# key cache method. This is mainly used to force long character keys in

\# large tables to use the slower key cache method to create the index.

myisam\_sort\_buffer\_size=67M

\# Size of the Key Buffer, used to cache index blocks for MyISAM tables.

\# Do not set it larger than 30% of your available memory, as some memory

\# is also required by the OS to cache rows. Even if you're not using

\# MyISAM tables, you should still set it to 8-64M as it will also be

\# used for internal temporary disk tables.

key\_buffer\_size=53M

\# Size of the buffer used for doing full table scans of MyISAM tables.

\# Allocated per thread, if a full scan is needed.

read\_buffer\_size=64K

read\_rnd\_buffer\_size=256K

\# This buffer is allocated when MySQL needs to rebuild the index in

\# REPAIR, OPTIMZE, ALTER table statements as well as in LOAD DATA INFILE

\# into an empty table. It is allocated per thread so be careful with

\# large settings.

sort\_buffer\_size=256K

\#\*\*\* INNODB Specific options \*\*\*

\# Use this option if you have a MySQL server with InnoDB support enabled

\# but you do not plan to use it. This will save memory and disk space

\# and speed up some things.

\#skip-innodb

\# Additional memory pool that is used by InnoDB to store metadata

\# information. If InnoDB requires more memory for this purpose it will

\# start to allocate it from the OS. As this is fast enough on most

\# recent operating systems, you normally do not need to change this

\# value. SHOW INNODB STATUS will display the current amount used.

innodb\_additional\_mem\_pool\_size=3M

\# If set to 1, InnoDB will flush (fsync) the transaction logs to the

\# disk at each commit, which offers full ACID behavior. If you are

\# willing to compromise this safety, and you are running small

\# transactions, you may set this to 0 or 2 to reduce disk I/O to the

\# logs. Value 0 means that the log is only written to the log file and

\# the log file flushed to disk approximately once per second. Value 2

\# means the log is written to the log file at each commit, but the log

\# file is only flushed to disk approximately once per second.

innodb\_flush\_log\_at\_trx\_commit=1

\# The size of the buffer InnoDB uses for buffering log data. As soon as

\# it is full, InnoDB will have to flush it to disk. As it is flushed

\# once per second anyway, it does not make sense to have it very large

\# (even with long transactions).

innodb\_log\_buffer\_size=2M

\# InnoDB, unlike MyISAM, uses a buffer pool to cache both indexes and

\# row data. The bigger you set this the less disk I/O is needed to

\# access data in tables. On a dedicated database server you may set this

\# parameter up to 80% of the machine physical memory size. Do not set it

\# too large, though, because competition of the physical memory may

\# cause paging in the operating system. Note that on 32bit systems you

\# might be limited to 2-3.5G of user level memory per process, so do not

\# set it too high.

innodb\_buffer\_pool\_size=103M

\# Size of each log file in a log group. You should set the combined size

\# of log files to about 25%-100% of your buffer pool size to avoid

\# unneeded buffer pool flush activity on log file overwrite. However,

\# note that a larger logfile size will increase the time needed for the

\# recovery process.

innodb\_log\_file\_size=52M

\# Number of threads allowed inside the InnoDB kernel. The optimal value

\# depends highly on the application, hardware as well as the OS

\# scheduler properties. A too high value may lead to thread thrashing.

innodb\_thread\_concurrency=8

[be2e410d180fbfd710e157ba63374ed8.png]: /images/20221119/b5ec3321a2ef471aa71e1322d5f53209.png
[582ade826cbb2f5fba35e00e00e0080d.png]: /images/20221119/6dc69b5185274ff593a5a77465f209e4.png

7 centos mysql中文乱码_【Linux】CentOS7中使用mysql,查询结果显示中文乱码的解决办法...

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