SQLAlchemy - insert from a result object? - python-3.x

Question

The below query makes a result set in the variable 'result'
I need to insert that into the iconndest (the new MySQL server). But I have no idea how to insert the query result into the new table? I just want to do Insert into DB.TBL SELECT * FROM RESULT. But I am not sure how?
import mysql.connector
import pandas as pd
from sqlalchemy import create_engine
import multiprocessing as mp
from multiprocessing import cpu_count
try:
engine_source = create_engine("CONN STRING")
iconn = engine_source.connect()
result = iconn.execute('SELECT QUERY')
print('EXTRACT COMPLETE')
engine_dest = create_engine("CONN STRING")
iconndest = engine_dest.connect()
iconndest.execute('SELECT * from ')
engine_source.dispose()
engine_dest.dispose()
except Exception as e:
print('extract: ' + str(e))

Answer 1

What you describe is very simple if we use .mappings() to convert the list of Row objects to a list of RowMapping objects when we retrieve the results. RowMapping objects behave like dict objects when passed as parameter values:
import sqlalchemy as sa
source_engine = sa.create_engine("mssql+pyodbc://scott:tiger^5HHH#mssql_199")
destination_engine = sa.create_engine("sqlite://")
with source_engine.begin() as conn:
results = (
conn.exec_driver_sql(
"""\
SELECT 1 AS id, N'foo' AS txt
UNION ALL
SELECT 2 AS id, N'bar' AS txt
"""
)
.mappings()
.all()
)
print(results)
# [{'id': 1, 'txt': 'foo'}, {'id': 2, 'txt': 'bar'}]
destination_engine.echo = True
with destination_engine.begin() as conn:
conn.exec_driver_sql("CREATE TABLE t (id int, txt varchar(10))")
conn.execute(
sa.text("INSERT INTO t (id, txt) VALUES (:id, :txt)"), results
)
"""SQL emitted:
INSERT INTO t (id, txt) VALUES (?, ?)
[generated in 0.00038s] ((1, 'foo'), (2, 'bar'))
"""