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mysql查看字段在哪个表中

日期:2022/10/02 06:59作者:人气:

导读:...

use information_schema; select * from columns where column_name='字段名' ;

sql server 和 mysql 如何实现异构实时同步

在sql server中建立my sql的linkedserver,然后建立双向的triger

怎样建立MySQL的SSL连接通道?

  通常我们在编译MySQL的时候都加入了with-openssl选项,但这并不代表MySQL已经支持了OpenSSL连接,我们可以通过如下命令进行检测:

SHOW VARIABLES LIKE 'have_openssl';

如果显示DISABLED则表明MySQL尚不支持OpenSSL。
  

建立SSL证书

;;建几个目录和文件

mkdir /usr/local/myssl

cd /usr/local/myssl

mkdir private newcerts

touch index。txt

echo 01 > serial

;;拷贝一份OpenSSL的缺省配置到当前目录

cp /usr/local/openssl/openssl。
  cnf 。

;;修改当前目录下的openssl。cnf,将。/demoCA替换为/usr/local/myssl,replace的具体用法见man

replace 。/demoCA /usr/local/myssl —— /usr/local/myssl/openssl。
  cnf

;;建立根证书

openssl req -new -x509 -keyout private/cakey。pem -out cacert。pem -config openssl。cnf

# Sample output:

# Using configuration from /usr/local/myssl/openssl。
  cnf

# Generating a 1024 bit RSA private key

# ……++++++

# ……++++++

# writing new private key to '/usr/local/myssl/private/cakey。
  pem'

# Enter PEM pass phrase:

# Verifying password - Enter PEM pass phrase:

# ——

# You are about to be asked to enter information that will be

# incorporated into your certificate request。
  

# What you are about to enter is what is called a Distinguished Name

# or a DN。

# There are quite a few fields but you can leave some blank

# For some fields there will be a default value,

# If you enter '。
  ', the field will be left blank。

# ——

# Country Name (2 letter code) [AU]:CN

# State or Province Name (full name) [Some-State]:ZJ

# Locality Name (eg, city) []:JX

# Organization Name (eg, company) [Internet Widgits Pty Ltd]:Centeur CA

# Organizational Unit Name (eg, section)[] :HN

# Common Name (eg, YOUR name)[] :MySQL admin

# Email Address []:lypdarling@gmail。
  com

;;建立服务端证书

openssl req -new -keyout server-key。pem -out server-req。pem -days 3600 -config openssl。cnf

# Sample output:

# Using configuration from /usr/local/myssl/openssl。
  cnf

# Generating a 1024 bit RSA private key

# ……++++++

# ……++++++

# writing new private key to '/usr/local/myssl/server-key。
  pem'

# Enter PEM pass phrase:

# Verifying password - Enter PEM pass phrase:

# ——

# You are about to be asked to enter information that will be

# incorporated into your certificate request。
  

# What you are about to enter is what is called a Distinguished Name

# or a DN。

# There are quite a few fields but you can leave some blank

# For some fields there will be a default value,

# If you enter '。
  ', the field will be left blank。

# ——

# Country Name (2 letter code) [AU]:CN

# State or Province Name (full name) [Some-State]:ZJ

# Locality Name (eg, city) []:JX

# Organization Name (eg, company) [Internet Widgits Pty Ltd]:Centeur CA

# Organizational Unit Name (eg, section) []:HN

# Common Name (eg, YOUR name) []:MySQL server

# Email Address []:lypdarling@gmail。
  com

#

# Please enter the following 'extra' attributes

# to be sent with your certificate request

# A challenge password []:

# An optional company name []:。
  

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