This happened to me as well. Happened after installing libsqlite3-dev.
Fixed by running apt-get remove libsqlite3-dev .
Best,
David.
On Thursday, 8 November 2012 10:19:06 UTC+3, Eugeny Klementev wrote:
>
> Hi all,
>
> I use sqlalchemy with postgresql backend.
>
> On script starting i use code to initialize all table:
>
> engine = create_engine(settings.database_engine)
> Base.metadata.create_all(engine)
> session = Session(bind = engine)
>
> And i run two instances of this script.
>
> One of instances broken with message:
>
> Traceback (most recent call last):
> File "./datadb.py", line 40, in <module>
> Base.metadata.create_all(engine)
> File "/usr/lib/python2.7/dist-packages/sqlalchemy/schema.py", line 2515,
> in create_all
> tables=tables)
> File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line
> 2234, in _run_visitor
> conn._run_visitor(visitorcallable, element, **kwargs)
> File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line
> 1904, in _run_visitor
> **kwargs).traverse_single(element)
> File "/usr/lib/python2.7/dist-packages/sqlalchemy/sql/visitors.py", line
> 86, in traverse_single
> return meth(obj, **kw)
> File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/ddl.py", line
> 67, in visit_metadata
> self.traverse_single(table, create_ok=True)
> File "/usr/lib/python2.7/dist-packages/sqlalchemy/sql/visitors.py", line
> 86, in traverse_single
> return meth(obj, **kw)
> File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/ddl.py", line
> 86, in visit_table
> self.connection.execute(schema.CreateTable(table))
> File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line
> 1405, in execute
> params)
> File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line
> 1496, in _execute_ddl
> compiled
> File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line
> 1646, in _execute_context
> context)
> File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/base.py", line
> 1639, in _execute_context
> context)
> File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/default.py",
> line 330, in do_execute
> cursor.execute(statement, parameters)
> sqlalchemy.exc.IntegrityError: (IntegrityError) duplicate key value
> violates unique constraint "pg_type_typname_nsp_index"
> DETAIL: Key (typname, typnamespace)=(datadb_datapoint_id_seq, 2200)
> already exists.
> '\nCREATE TABLE datadb_datapoint (\n\tid SERIAL NOT NULL, \n\tunit_id
> INTEGER NOT NULL, \n\ttimestamp INTEGER NOT NULL, \n\tvalue_type VARCHAR
> NOT NULL, \n\tvalue VARCHAR NOT NULL, \n\tPRIMARY KEY (id)\n)\n\n' {}
>
> I understand it is conflict of creation of tables from different instances
> at one time.
>
> I hope that sqlalchemy has any locking mechanism, but my investigations
> are failed.
>
> Anybody known solution of my problem?
>
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