[DB-SIG] query - prepared statment
mal at egenix.com
Fri Feb 10 23:15:36 CET 2006
Carsten Haese wrote:
> On Fri, 2006-02-10 at 04:07, python eager wrote:
>> Hi All,
>> How to use prepared statment. Can u give one example for insert,
>> delete and update statments. please.
> The DB-API standard does not define a separate method for preparing a
> statement. Preparing the statement is part of the cursor.execute() and
> executemany() methods. execute() prepares the statement and executes it
> with the given parameters. executemany() should prepare the statement
> once and execute it many times over, once for each set of parameters.
> For DB-API implementations that implement statement caching (informixdb
> and cx_Oracle, for example), the first execute call takes the place of
> preparing a statement. If you subsequently execute the same query string
> on the same cursor with different parameters, the same prepared
> statement is reused.
> Apparently cx_Oracle implements a non-standard prepare() method that
> prepares a query string for later execution by either passing the same
> string or None to execute().
Perhaps we should something like this to the list of standard
DB-API extensions ?!
This is what we have in mxODBC 2.1:
Prepare a database operation (query or command) statement for later
execution and set cursor.command. To execute a prepared statement,
pass cursor.statement to one of the .executeXXX() methods. Return
values are not defined.
Provides access to the last prepared or executed SQL command
available through the cursor. If no such command is available, None
Looks very similar to what cx_Oracle implements.
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