I have a dictionary like: d = {'table': 'db_schema.foo', 'column': 'bar'}
. I want to pass this dictionary after removing quotes from all values. So I want to get {'table': db_schema.foo, 'column': bar}
dynamically.
Details:
I am trying to pass run a dynamic query into exasol after connecting. I am using pyexasol here and trying execute()
. I am trying to execute simple query like:
SELECT *
FROM db_schema.foo
WHERE bar >= 0
If I provide dictionary d
then the query that's get executed is:
SELECT *
FROM 'db_schema.foo'
WHERE 'bar' >= 0
and results in error. So I want to remove quote from all values. I have tried {k:v.strip("\'") for k, v in d.items()}
etc. but not successful yet.
Requested Code:
foo_query = '''select *
from {app_table}
where {col} >= '2020-01-01'
limit 10;'''
foo_param={'app_table': 'src.application',
'col': 'createdat'}
foo_results = exasol.runQueryExaParams(query=foo_query, query_param=foo_param)
foo_results1 = exasol.runQueryExaParams(query=foo_query, query_param={k:v.strip("\'") for k, v in foo_param.items()})
where exasol is a class built on pyexasol with just connection parameters. Relevant method from class there is:
def runQueryExaParams(self, query, query_param):
self.conn = pyexasol.connect(
dsn=self.__dsn, user=self.__user, password=self.__password, encryption=True)
res = self.conn.export_to_pandas(query, query_param)
self.conn.close()
res.columns = res.columns.str.lower()
return res
In both cases I am getting same error:
pyexasol.exceptions.ExaQueryError:
(
message => syntax error, unexpected simple_string_literal [line 3, column 22] (Session: )
dsn =>
user =>
schema =>
code => 42000
session_id =>
query => EXPORT (
select *
from 'src.application'
where 'createdat' >= '2020-01-01'
limit 10
) INTO CSV
AT 'https://1.2.3.4' FILE '000.csv'
WITH COLUMN NAMES
)
As I said in my comment, you need to read SQL FORMATTING.
With that said, you need to change your code to be something like this:
query = '''
SELECT *
FROM {app_table!q}
WHERE {col!i} >= '2020-01-01'
LIMIT 10;
'''
query_param = {
'app_table': ('src', 'application'),
'col': 'createdat'
}
results = exasol.runQueryExaParams(
query=query,
query_param=query_param
)
As the documentation indicates, the code above will result in a query like this:
SELECT *
FROM "src"."application"
WHERE createdat >= '2020-01-01'
LIMIT 10;
I hope it helps.