CODEWITHSUNDEEP
pythonmysqltypesmysql-connector-python
complextea
complextea

Reputation: 423

format specifier for bigint of mysql-python

I have my primary key declared as :

id bigint PRIMARY KEY

I want extract a certain id, and want to use it further.

localid = cursor.fetchone()[0]
print type(localid)
query1 = ("Select * from table_name WHERE id= %d;")
cursor.execute(query1, localid)
query2 = ("Select * from table_name WHERE id= 1;")
cursor.execute(query2)
  1. type(localid) is printed as int currently, where the fetched value is just 2 or 3 or 45.
  2. query1 does not work while query2 does.
  3. Is %d the correct specifier? I don't think so.
  4. If the number fetched is indeed out of range of the normal int, would %d be right? If not, what to use?

Extra Info: Mysql-python connector package used. Python 2.7

Upvotes: 2

Views: 3696

Answers (1)

luoluo
luoluo

Reputation: 5533

If you are using MySQLdb, you only need %s in the execute function maybe.

Your Mysql-python is MySQLdb indeed.

solution1`:

query1 = ("Select * from table_name WHERE id= %s;")
cursor.execute(query1, (localid,))

Note: If args is a sequence, then %s must be used as the
      parameter placeholder in the query. If a mapping is used,
      %(key)s must be used as the placeholder.

solution2:

query1 = ("Select * from table_name WHERE id= %d;" % localid)
cursor.execute(query1)

Detail explaination in Mysqldb.cursors

class BaseCursor(__builtin__.object)
 |  A base for Cursor classes. Useful attributes:
 |  
 |  description
 |      A tuple of DB API 7-tuples describing the columns in
 |      the last executed query; see PEP-249 for details.
 |  
 |  description_flags
 |      Tuple of column flags for last query, one entry per column
 |      in the result set. Values correspond to those in
 |      MySQLdb.constants.FLAG. See MySQL documentation (C API)
 |      for more information. Non-standard extension.
 |  
 |  arraysize
 |      default number of rows fetchmany() will fetch
 |  
 |  Methods defined here:
 |  execute(self, query, args=None)
 |      Execute a query.
 |      
 |      query -- string, query to execute on server
 |      args -- optional sequence or mapping, parameters to use with query.
 |      
 |      Note: If args is a sequence, then %s must be used as the   #notice
 |      parameter placeholder in the query. If a mapping is used,
 |      %(key)s must be used as the placeholder.
 |      
 |      Returns long integer rows affected, if any
 |

Upvotes: 2

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