Locks in SQLAlchemy

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Hi,

I am using SQLAlchemy to do transactions into PosgreSQL db using Python application.
I don't know how to use locks in SQLAlchemy.

Anybody can help me to use locks in SQLAlchemy.

I am facing a problem as follows,

While running two instances of a an application parallel, it tries to insert rows into a same table. Sometimes I am getting error of duplicate primary key. Can I resolve this using lock concept?


Best Regards,
Suji
 
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1) If you are using postgres database you want to run the both instance with out the error of primary key use serial data type for the table.
2) External locking procedure :

conn = engine.connect()
conn.execute("LOCK TABLES Pointer WRITE")
#do stuff with conn
conn.execute("UNLOCK TABLES")
 

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