maxkey = max(len(key) for key in rec) # max key len
for key in rec: # or: \t align
print('%-*s => %s' % (maxkey, key, rec[key])) # -ljust, *len
print(sept)
def dumpdb(cursor, table, format=True):
if not format:
cursor.execute('select * from ' + table)
while True:
rec = cursor.fetchone()
if not rec: break
print(rec)
else:
from makedicts import makedicts
recs = makedicts(cursor, 'select * from ' + table)
showformat(recs)
if __name__ == '__main__':
import sys
dbname, format, table = 'dbase1', False, 'people'
cmdargs = sys.argv[1:]
if '-' in cmdargs: # format if '-' in cmdline args
format = True # dbname if other cmdline arg
cmdargs.remove('-')
if cmdargs: dbname = cmdargs.pop(0)
if cmdargs: table = cmdargs[0]
from loaddb import login
conn, curs = login(dbname)
dumpdb(curs, table, format)
"""
删除并重建数据库文件
"""
import sys
if input('Are you sure').lower() not in ('y', 'yes'):
sys.exit()
dbname = (len(sys.argv) > 1 and sys.argv[1]) or 'dbase1'
table = (len(sys.argv) > 2 and sys.argv[2]) or 'people'
from loaddb import login
conn, curs = login(dbname)
try:
curs.execute('drop table ' + table)
except:
print('database table did not exist')
command = 'create table % (name char(30), job char(10), pay int(4))' % table
curs.execute(command)
conn.commit()
print('made', dbname, table)
""" run a query string, display formatted result table example: querydb.py dbase1 "select name, job from people where pay > 50000" """ import sys database, querystr = 'dbase1', 'select * from people' if len(sys.argv) > 1: database = sys.argv[1] if len(sys.argv) > 2: querystr = sys.argv[2] from makedicts import makedicts from dumpdb import showformat from loaddb import login conn, curs = login(database) rows = makedicts(curs, querystr) showformat(rows)
""" run a query string, display formatted result table example: querydb.py dbase1 "select name, job from people where pay > 50000" """ import sys database, querystr = 'dbase1', 'select * from people' if len(sys.argv) > 1: database = sys.argv[1] if len(sys.argv) > 2: querystr = sys.argv[2] from makedicts import makedicts from dumpdb import showformat from loaddb import login conn, curs = login(database) rows = makedicts(curs, querystr) showformat(rows)
def consultas():
from makedicts import makedicts
from dumpdb import showformat
from loaddb import login
conn, curs = login('Universidad')
print "\n\n1.- Obtener los nombres y notas de los estudiantes así como el resultado de su solicitud de \
manera que tengan un valor de corrección menor que 1000 y hayan solicitado la carrera de \
Informática en la Universidad Complutense de Madrid.\n"
rows = makedicts(curs, "SELECT nombre_est, nota \
FROM estudiantes, solicitudes \
WHERE estudiantes.id = solicitudes.id \
AND estudiantes.valor < 1000 \
AND solicitudes.carrera = 'Informatica' \
AND solicitudes.nombre_univ = 'Universidad Complutense de Madrid'")
showformat(rows)
print "\n\nObtener los estudiantes cuya nota ponderada cambia en más de\
un punto respecto a la nota original.\n"
rows = makedicts(curs, "SELECT * \
FROM estudiantes \
WHERE estudiantes.nota - (estudiantes.valor * estudiantes.nota / 1000) > 1")
showformat(rows)
print '\n\nModificar la tabla solicitudes de forma que aquellos estudiantes que no solicitaron ninguna\
universidad, soliciten "Informática" en la "Universidad de Jaen".\n'
rows = makedicts(curs, "SELECT id FROM estudiantes WHERE id NOT IN (SELECT id FROM solicitudes)")
for row in rows:
curs.execute('''INSERT INTO solicitudes VALUES (?, 'Universidad de Jaen', 'Informatica', 'No')''', (row["id"], ))
rows = makedicts(curs, "SELECT * FROM solicitudes WHERE nombre_univ = 'Universidad de Jaen'")
showformat(rows)
print '\n\nAdmitir en la "Universidad de Jaen" a todos los estudiantes de Económicas quienes no \
fueron admitidos en dicha carrera en otras universidades.\n'
rows = makedicts(curs, "SELECT id\
FROM solicitudes\
WHERE carrera = 'Economia'\
AND decision = 'No'\
AND nombre_univ != 'Universidad de Jaen'\
AND id NOT IN (SELECT id\
FROM solicitudes\
WHERE carrera = 'Economia'\
AND decision = 'Si')");
for row in rows:
curs.execute('''INSERT INTO solicitudes VALUES (?, 'Universidad de Jaen', 'Economia', 'Si')''', (row["id"], ))
rows = makedicts(curs, "SELECT * FROM solicitudes WHERE nombre_univ = 'Universidad de Jaen' AND carrera = 'Economia'")
showformat(rows)
print "\n\nBorrar a todos los estudiantes que solicitaron más de 2 carreras diferentes.\n"
rows = makedicts (curs, 'SELECT id,count(DISTINCT carrera) AS c FROM solicitudes GROUP BY id HAVING c>2')
for r in rows:
curs.execute('DELETE FROM estudiantes WHERE id = ?',(r['id'], ))
rows = makedicts(curs, 'SELECT * FROM estudiantes')
showformat(rows)
###############################################################################
# physically delete and recreate db files in mysql's data\ directory
# usage: makedb.py dbname? (tablename is implied)
###############################################################################
import sys
dbname = (len(sys.argv) > 1 and sys.argv[1]) or 'peopledb'
if raw_input('Are you sure?') not in ('y', 'Y', 'yes'):
sys.exit()
from loaddb import login
conn, curs = login(db=None)
try:
curs.execute('drop database ' + dbname)
except:
print 'database did not exist'
curs.execute('create database ' + dbname) # also: 'drop table tablename'
curs.execute('use ' + dbname)
curs.execute('create table people (name char(30), job char(10), pay int(4))')
conn.commit() # this seems optional
print 'made', dbname
###############################################################################
# physically delete and recreate db files in mysql's data\ directory
# usage: makedb.py dbname? (tablename is implied)
###############################################################################
import sys
dbname = (len(sys.argv) > 1 and sys.argv[1]) or 'peopledb'
if raw_input('Are you sure?') not in ('y', 'Y', 'yes'):
sys.exit()
from loaddb import login
conn, curs = login(db=None)
try:
curs.execute('drop database ' + dbname)
except:
print 'database did not exist'
curs.execute('create database ' + dbname) # also: 'drop table tablename'
curs.execute('use ' + dbname)
curs.execute('create table people (name char(30), job char(10), pay int(4))')
conn.commit() # this seems optional
print 'made', dbname
