Mysql Command Line Client: Difference between revisions
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=Options= | =Options= | ||
==-e, --execute=name== | ==<tt>-e</tt>, <tt>--execute=name</tt>== | ||
Execute command and quit. | Execute command and quit. | ||
==<tt>-D</tt>, <tt>--database=name</tt> | |||
Specify the database to use. | |||
=Connect= | =Connect= | ||
| Line 47: | Line 51: | ||
</syntaxhighlight> | </syntaxhighlight> | ||
The command sends the result to stdout. If the select query produces no results, the stdout is the empty string. | The command sends the result to stdout. If the select query produces no results, the stdout is the empty string: | ||
<syntaxhighlight lang='bash'> | |||
local result | |||
result=$(mysql -u root -p${database_root_password} -e "SELECT SCHEMA_NAME FROM INFORMATION_SCHEMA.SCHEMATA WHERE SCHEMA_NAME='${database_name}'") | |||
if [[ -n ${result} ]]; then | |||
echo "database exists" | |||
else | |||
echo "database does not exist" | |||
fi | |||
</syntaxhighlight> | |||
Latest revision as of 02:10, 30 December 2023
Internal
Options
-e, --execute=name
Execute command and quit.
==-D, --database=name
Specify the database to use.
Connect
mysql -u root -p
Will challenge for password.
mysql -u root -p<password>
No space after -p.
The username and password can also be stored in ~/.my.cnf:
[client]
user = root
password = XXXXXXXX
Scripting Database Interaction
mysql -u root -p<password> < statements.sql
where statements.sql should contain SQL:
SELECT VERSION();
...
Alternatively:
mysql -u root -p<password> -e "SELECT VERSION()"
The command sends the result to stdout. If the select query produces no results, the stdout is the empty string:
local result
result=$(mysql -u root -p${database_root_password} -e "SELECT SCHEMA_NAME FROM INFORMATION_SCHEMA.SCHEMATA WHERE SCHEMA_NAME='${database_name}'")
if [[ -n ${result} ]]; then
echo "database exists"
else
echo "database does not exist"
fi