How to insert a python list into Postgres table

问题

I am trying to determine the simplest way to insert data from a python list into a PostgreSQL table.

My PostgreSQL table was created as follows;

CREATE TABLE results(Id serial primary key, T0 timestamp, T1 real, T2 real, T3 real, T4 real, Total real, Result text);

My python list is formatted as follows;

ResultsList = ['2015-07-20 16:06:05', 0.16, 5.22, 5.81, 0.69, 11.90, 'OK']

I am using the following python code to write the list into the results table;

import psycopg2 as dbapi
con = dbapi.connect(database='xxx', user='xxx')
cur = con.cursor()
cur.execute("INSERT into results VALUES (%s);", (ResultsList),)
con.commit()

The interpreter spits out the following error;

Error not all arguments converted during string formatting
Process finished with exit code 0

Any clues would be appreciated.

Thanks :)

回答1:

As ResultList is already a sequence, you do not need to try and convert it to a tuple. What you really need is specify the right amount of values in your SQL statement:

cur.execute("INSERT into results(T0, T1, T2, T3, T4, Total, Result) VALUES (%s, %s, %s, %s, %s, %s, %s)", ResultList)

For more about it, read the docs.

回答2:

LOADING MULTIPLE VALUES FROM A LIST INTO A POSTGRESQL TABLE. I have also shown how to connect to a postgres database through python and create a table in postgres.

list_1=[39,40,41,42,43] #list to load in postgresql table


conn=psycopg2.connect(database="t2_reporting_tool_development",user="xyz",host="localhost")
cur = conn.cursor()
cur.execute("create table pg_table (col1 int)")

#LOADING dealers_list IN pg_table TABLE 
cur.execute("TRUNCATE TABLE pg_table")
for ddeci in dealers_list:
   cur.execute("INSERT into pg_table(col1) VALUES (%s)", [ddeci])

来源：https://stackoverflow.com/questions/31510945/how-to-insert-a-python-list-into-postgres-table

标签

python

postgresql

psycopg2