Python将xml / string数据插入PostgreSql数据库

Question

import psycopg2
myConnection = psycopg2.connect( host='192.168.103.124', user='dev', password='abc123', dbname='dev')
cursor = myConnection.cursor()
teststr='<test>123456</test>'
sql="insert into nlp_train_data(context_xml) VALUES ({})".format(teststr)
cursor.execute(sql)
myConnection.commit()

This is what I get:

ProgrammingError                          Traceback (most recent call last)
<ipython-input-190-1560207a8c5d> in <module>()
      2 teststr='<test>123456</test>'
      3 sql="insert into nlp_train_data(context_xml) VALUES ({})".format(teststr)
----> 4 cursor.execute(sql)
      5 myConnection.commit()
      6 #except:

ProgrammingError: syntax error at or near "<"
LINE 1: insert into nlp_train_data(context_xml) VALUES (<test>123456...

I very much appreciate if anyone could possibly help. Thanks.

Answer 1

While string formatting in python, the passed value ignores the single quotes ('). So you can do this ('%s') instead of (%s)

sql="insert into nlp_train_data(context_xml) VALUES ('%s')" % (teststr,)