Jesse Sandberg 807feb3ac4 Validate variable, return only the found variable value instead of tuple ...

Docs imply the mysql_variables is used to operate a single variable therefore
- fail before making any db connections if variable is not set
- validate chars for mysql variable name with re.match(^[a-z0-9_]+)
- use "SHOW VARIABLE WHERE Variable_name" instead of LIKE search
- getvariable() returns only the value or None if variable is not found
- the module returns only the found variable value instead of tuple for easier operation eg. as registere variable in tasks

2016-12-08 11:23:24 -05:00

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Validate variable, return only the found variable value instead of tuple

2016-12-08 11:23:24 -05:00