getting error while dumping the data from excel sheet to mysql database

Question

I am importing the specific data from excel sheet and dumping that data to mysql database. But while doing that i am getting the error

       $ python dtz_db.py
dtz_db.py:43: Warning: Field 'datetime' doesn't have a default value
  cursor.execute(query2, values2)
dtz_db.py:43: Warning: Data truncated for column 'lease_start_date' at row 1
  cursor.execute(query2, values2)
dtz_db.py:43: Warning: Data truncated for column 'lease_end_date' at row 1
  cursor.execute(query2, values2)
dtz_db.py:43: Warning: Incorrect integer value: '' for column 'lease' at row 1
  cursor.execute(query2, values2)
dtz_db.py:43: Warning: Incorrect integer value: '' for column 'leased' at row 1
  cursor.execute(query2, values2)
Traceback (most recent call last):
  File "dtz_db.py", line 44, in <module>
    cursor.execute(query1, values1)
  File "c:\Python27\lib\site-packages\MySQLdb\cursors.py", line 205, in execute
    self.errorhandler(self, exc, value)
  File "c:\Python27\lib\site-packages\MySQLdb\connections.py", line 36, in defau
lterrorhandler
    raise errorclass, errorvalue
_mysql_exceptions.IntegrityError: (1452, 'Cannot add or update a child row: a fo
reign key constraint fails (`dtz_new`.`property_property`, CONSTRAINT `lease_id_
refs_id_816819bc` FOREIGN KEY (`lease_id`) REFERENCES `property_propertylease` (
`id`))')

my python file is this cod is for selecting the specific data from the excel file and dump that data to mysql database

import xlrd
import MySQLdb
book = xlrd.open_workbook("dtz11.xls")
sheet = book.sheet_by_name("Sheet1")
database = MySQLdb.connect (host="localhost", user="root", passwd="", db="dtz_new")
cursor = database.cursor()
query1 = """INSERT INTO property_property( name,  inpection_date) VALUES(%s, %s )"""
query2 = """INSERT INTO property_propertylease( lease_start_date,  lease_end_date, lease, leased) VALUES(%s, %s, %s, %s)"""
for r in range(1, sheet.nrows):
    gaurav2         = sheet.cell(r,1).value
    gaurav3         = sheet.cell(r,2).value
    gaurav8         = sheet.cell(r,18).value
    gaurav9         = sheet.cell(r,19).value
    gaurav10        = sheet.cell(r,20).value
    gaurav11        = sheet.cell(r,21).value
    values1 = (gaurav2, gaurav3)
    values2 = (gaurav8, gaurav9, gaurav10, gaurav11)
    cursor.execute(query2, values2)
    cursor.execute(query1, values1)
cursor.close()
database.commit()
database.close()
print "dumped successfully"
columns = str(sheet.ncols)
rows = str(sheet.nrows)
print "I just imported "+ columns+ " columns and "+ rows+" rows to MySQL!"

and my db table schema is

Please help me to resolve this problem,,,, Thanks a lot

Answer 1

Your insert statement asserts that there will be 8 variables provided to the DB, but you only give it 7. Start there.

(I know neither python nor excel interaction so I haven't posted any code. I suspect the problem is entirely in that INSERT statement though.)

Edit: So the foreign key constraint error means that according to your schema, property_property's lease_id points to data in another table (property_propertylease). Since you haven't given this second table any data, the insert fails.

Put another way, your insert statement populates a parent table. The parent table is attempting to reference data in a child table that does not exist.