Updating an Existing Row in .NET

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Updating an Existing Row
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The following code shows how you might update columns for an existing row:
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curexecute("update stocks set shares= where symbol= ",(50,'IBM'))
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Again, when you need to insert values into the SQL statement, make sure you use the placeholders and supply a tuple of values as parameters
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Deleting Rows
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The following code shows how to delete rows:
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curexecute("delete from stocks where symbol= ",('SCOX',))
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Performing Basic Queries
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The following code shows how you can perform basic queries and obtain the results:
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# Select all columns from a table for row in curexecute("select * from stocks"): statements # Select a few columns for shares, price in curexecute("select shares,price from stocks"): statements # Select matching rows for row in curexecute("select * from stocks where symbol= ",('IBM',)) statements # Select matching rows with ordering for row in curexecute("select * from stocks order by shares"): statements # Select matching rows with ordering in reverse for row in curexecute("select * from stocks order by shares desc"): statements # Joining tables on a common column name (symbol) for row in curexecute("""select ssymbol, sshares, pprice from stocks as s, prices as p using(symbol)"""): statements
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DBM-Style Database Modules
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Python includes a number of library modules for supporting UNIX DBM-style database files Several standard types of these databases are supportedThe dbm module is used to read standard UNIX-dbm database filesThe gdbm module is used to read GNU dbm database files (http://wwwgnuorg/software/gdbm)The dbhash module is used to read database files created by the Berkeley DB library (http://wwworaclecom/ database/berkeley-db/indexhtml)The dumbdbm module is a pure-Python module that implements a simple DBM-style database on its own All of these modules provide an object that implements a persistent string-based dictionaryThat is, it works like a Python dictionary except that all keys and values are restricted to strings A database file is typically opened using a variation of the open() function
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open(filename [, flag [, mode]])
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This function opens the database file filename and returns a database object flag is 'r' for read-only access, 'w' for read-write access, 'c' to create the database if it doesn t exist, or 'n' to force the creation of a new database mode is the integer fileaccess mode used when creating the database (the default is 0666 on UNIX) The object returned by the open() function minimally supports the following dictionary-like operations:
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Operation
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d[key] = value value = d[key] del d[key] dclose() key in d dsync()
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Inserts value into the database Gets data from the database Removes a database entry Closes the database Tests for a key Writes all changes out to the database
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Specific implementations may also add additional features (consult the appropriate module reference for details) One issue with the various DBM-style database modules is that not every module is installed on every platform For example, if you use Python on Windows, the dbm and gdbm modules are typically unavailable However, a program may still want to create a DBM-style database for its own useTo address this issue, Python provides a module anydbm that can be used to open and create a DBM-style database fileThis module provides an open() function as described previously, but it is guaranteed to work on all platforms It does this by looking at the set of available DBM modules and picking the most advanced library that is available (typically dbhash if it s installed) As a fallback, it uses the dumbdbm module which is always available Another module is whichdb, which has a function whichdb(filename) that can be used to probe a file in order to determine what kind of DBM-database created it As a general rule, it is probably best not to rely upon these low-level modules for any application where portability is important For example, if you create a DBM database on one machine and then transfer the database file to another machine, there is a chance that Python won t be able to read it if the underlying DBM module isn t