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drop_table() does not work for me. Using MySQL, starting with an empty dbms.
<div>
<blockquote type="cite">
<div>#!/usr/bin/env python</div>
<div>from pony.orm import *</div>
<div>db = Database()</div>
<div><br>
</div>
<div>class Variant(db.Entity):</div>
<div> pos = Required(str)</div>
<div> SubjectID = Required("Subject")</div>
<div><br>
</div>
<div>class Subject(db.Entity):</div>
<div> FamilyID = Optional(str)</div>
<div> IndivID = PrimaryKey(str)</div>
<div> Sex = Required(str)</div>
<div> variants = Set(Variant)</div>
<div><br>
</div>
<div># dict with params here</div>
<div>db.bind('mysql', params["host"], params["user"], params["passwd"], params["db"] )</div>
<div><br>
</div>
<div>db.generate_mapping( create_tables=True )</div>
<div><br>
</div>
<div>def dropTable( tableName ):</div>
<div> db.drop_table( tableName, if_exists=True, with_all_data=True )</div>
<div><br>
</div>
<div>@db_session</div>
<div>def inserts():</div>
<div> s1 = Subject( IndivID = 'sub1', Sex = '1',)</div>
<div> s2 = Subject( IndivID = 'sub2', Sex = '2',)</div>
<div><br>
</div>
<div>def main():</div>
<div> inserts()</div>
<div> dropTable('Subject')</div>
<div> inserts()</div>
<div><br>
</div>
<div>main()</div>
</blockquote>
<div>
<div><br>
</div>
<div>generates:</div>
<div>
<blockquote type="cite">
<div>Traceback (most recent call last):</div>
<div> File "/hpc/users/goldba06/repos/asc_datamanagementandprocessing/dbms_pony/t.py", line 34, in <module></div>
<div> main()</div>
<div> File "/hpc/users/goldba06/repos/asc_datamanagementandprocessing/dbms_pony/t.py", line 32, in main</div>
<div> inserts()</div>
<div> File "<auto generated wrapper of inserts() function>", line 2, in inserts</div>
<div> File "/hpc/users/goldba06/.local/lib/python2.7/site-packages/pony/orm/core.py", line 354, in new_func</div>
<div> finally: self.__exit__(exc_type, exc_value, exc_tb)</div>
<div> File "/hpc/users/goldba06/.local/lib/python2.7/site-packages/pony/orm/core.py", line 386, in __exit__</div>
<div> commit()</div>
<div> File "<auto generated wrapper of commit() function>", line 2, in commit</div>
<div> File "/hpc/users/goldba06/.local/lib/python2.7/site-packages/pony/utils.py", line 97, in cut_traceback</div>
<div> return func(*args, **kwargs)</div>
<div> File "/hpc/users/goldba06/.local/lib/python2.7/site-packages/pony/orm/core.py", line 281, in commit</div>
<div> reraise(CommitException, exceptions)</div>
<div> File "/hpc/users/goldba06/.local/lib/python2.7/site-packages/pony/orm/core.py", line 275, in commit</div>
<div> try: primary_cache.commit()</div>
<div> File "/hpc/users/goldba06/.local/lib/python2.7/site-packages/pony/orm/core.py", line 941, in commit</div>
<div> if cache.modified: cache.flush()</div>
<div> File "/hpc/users/goldba06/.local/lib/python2.7/site-packages/pony/orm/core.py", line 1006, in flush</div>
<div> if obj is not None: obj._save_()</div>
<div> File "/hpc/users/goldba06/.local/lib/python2.7/site-packages/pony/orm/core.py", line 3938, in _save_</div>
<div> if status == 'created': obj._save_created_()</div>
<div> File "/hpc/users/goldba06/.local/lib/python2.7/site-packages/pony/orm/core.py", line 3838, in _save_created_</div>
<div> % (obj, e.__class__.__name__, msg), e)</div>
<div> File "/hpc/users/goldba06/.local/lib/python2.7/site-packages/pony/utils.py", line 124, in throw</div>
<div> raise exc</div>
<div>pony.orm.core.CommitException: Object Subject['sub1'] cannot be stored in the database. IntegrityError: 1062 Duplicate entry 'sub1' for key 'PRIMARY'</div>
</blockquote>
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<div><br>
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</div>
<div>which is what we expect if the table isn't dropped.</div>
<div>What I want to do is have these modules:</div>
<div>utilities: connect to dbms, and optionally drop a table</div>
<div>entities: the entities</div>
<div>load file: load a file into a table</div>
<div>query: some queries</div>
<div>load file, and query optionally use utilities</div>
<div><br>
</div>
<div><br>
<div>
<div>On Jun 19, 2014, at 10:24 AM, Alexey Malashkevich <<a href="mailto:alexeymalashkevich@gmail.com">alexeymalashkevich@gmail.com</a>> wrote:</div>
<blockquote type="cite">
<div dir="ltr">Hi Arthur,
<div><br>
</div>
<div>1. The method which you've used - db.get_connection().executescript() is specific for SQLite only. </div>
<div>You need to use the method db.execute() which works for all databases: <a href="http://doc.ponyorm.com/database.html#execute" target="_blank">
http://doc.ponyorm.com/database.html#execute</a></div>
<div>Also you can use methods for dropping the database tables:</div>
<div><a href="http://doc.ponyorm.com/database.html#drop_table" target="_blank">http://doc.ponyorm.com/database.html#drop_table</a></div>
<div><a href="http://doc.ponyorm.com/database.html#drop_all_tables" target="_blank">http://doc.ponyorm.com/database.html#drop_all_tables</a></div>
<div><br>
</div>
<div>2. The official way to get all entity attributes is getting the _attrs_ attribute from the entity class:</div>
<div><br>
</div>
<div> MyEntity._attrs_</div>
<div><br>
</div>
<div>It returns the list of all the entity attributes. You can iterate over this list and examine the attribute properties. For example, this is how you can print all attribute names which are not collections (collection means one-to-many relationship attribute):</div>
<div><br>
</div>
<div> for attr in MyEntity._attrs_:</div>
<div> if not <a href="http://attr.is">attr.is</a>_collection:</div>
<div> print <a href="http://attr.name/" target="_blank">attr.name</a></div>
<div><br>
</div>
<div>Below you can see a couple of functions for getting attributes:</div>
<div>
<div><br>
</div>
<div>def get_all_attrs(entity_cls):</div>
<div> return [ attr for attr in entity_cls._attrs_ ]</div>
<div><br>
</div>
<div>def get_attrs_with_columns(entity_cls):</div>
<div> return [ attr for attr in entity_cls._attrs_with_columns_ ]</div>
<div><br>
</div>
<div>def get_collection_attrs(entity_cls):</div>
<div> return [ attr for attr in entity_cls._attrs_ if <a href="http://attr.is">
attr.is</a>_collection ]</div>
<div><br>
</div>
<div>def get_all_attr_names(entity_cls):</div>
<div> return [ <a href="http://attr.name/">attr.name</a> for attr in entity_cls._attrs_ ]</div>
</div>
<div><br>
</div>
<div>Please let us know if you have further questions.</div>
<div><br>
</div>
<div>Regards,</div>
<div>Alexey</div>
</div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Thu, Jun 19, 2014 at 3:13 AM, Goldberg, Arthur P <span dir="ltr">
<<a>arthur.p.goldberg@mssm.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="word-wrap:break-word">Pony's nifty -- thanks.
<div><br>
</div>
<div>Some questions:</div>
<div><br>
</div>
<div>1. Direct SQL. Suppose I want to drop a table. I thought that this would work because executescript() appears in examples</div>
<div>
<blockquote type="cite">
<div> sql = "DROP TABLE IF EXISTS %s;" % tableName</div>
<div> db.get_connection().executescript(sql)</div>
</blockquote>
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<div>
<div><br>
</div>
</div>
<div>2. Entity class fields. Suppose I have</div>
<div><br>
</div>
<div>
<blockquote type="cite">
<div>class Subject(db.Entity):</div>
<div> FamilyID = Optional(str)</div>
<div> IndivID = PrimaryKey(str)</div>
<div> PatID = Optional(str, default='0')</div>
<div> MatID = Optional(str, default='0')</div>
<div> Sex = Required(str)</div>
<div> Pheno = Required(int)</div>
<div> SampleSet = Required(str)</div>
<div> variants = Set(Variant)</div>
</blockquote>
<blockquote type="cite">className = 'Subject' </blockquote>
<blockquote type="cite">self.slqobj = globals()[ className ]</blockquote>
</div>
<div>
<blockquote type="cite">
<div># I can get all fields in Subject with</div>
<div>self.slqobj._attrs_</div>
</blockquote>
</div>
<div>
<div><br>
</div>
</div>
<div>but is there an official method?</div>
<div><br>
</div>
<div>Thanks</div>
<div>Arthur</div>
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---</div>
<div> </div>
<div>Arthur Goldberg
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---</div>
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<div>Arthur Goldberg
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