Parses MySQL and translates ADQL to MySQL.
Tool for parsing and processing MySQL and ADQL SELECT queries
Designed to be used in conjunction with django-daiquri as a query processing backend but it can be easily used as a stand-alone tool or integrated into another project.
The easiest way to install the package is by using the pip tool:
pip install queryparser-python3
or if you are using an older version (2.7) of python
pip install queryparser-python2
Alternatively, you can clone the repository and install it from there. However, this step also requires generating the parser which is a slighly more elaborate process (see below).
Generating the parser from the git repository
To generate the parsers you need python (either 2 or 3), java above version 7, and antlr4 (antlr-4.*-complete.jar has to be installed inside the /usr/local/lib/ or /usr/local/bin/ directories).
After cloning the project run
and a lib directory will be created with the complete source for python2 and python3. After that run
python setup.py install
to install the generated parser in your virtual environment.
Parsing and processing of MySQL queries can be done by creating an instance of the MySQLQueryProcessor class
from queryparser.mysql import MySQLQueryProcessor qp = MySQLQueryProcessor()
feeding it a MySQL query
sql = "SELECT a FROM db.tab;" qp.set_query(sql)
and running it with
After the processing, the processor object qp will include tables, columns, functions, and keywords used in the query or will raise a QuerySyntaxError if there are any syntax errors in the query.
Alternatively, passing the query at initialization automatically processes it.
Translation of ADQL queries is done similarly by first creating an instance of the ADQLQueryTranslator class
from queryparser.adql import ADQLQueryTranslator adql = "SELECT TOP 100 POINT('ICRS', ra, de) FROM db.tab;" adt = ADQLQueryTranslator(adql)
which returns a translated string representing a valid MySQL query if the ADQL query had no errors. The MySQL query can then be parsed with the MySQLQueryProcessor in the same way as shown above.
First, install pytest
pip install pytest
then run the test suite for a version of python you would like to test with
pytest lib/python2 pytest lib/python3
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