I've never used Pandas, so this may not make any sense, but where does
the column "VARIABLE_VALUE" come from? Is it a column in your
dataframe?
Simon
On Wed, Aug 22, 2018 at 8:52 AM <imad.youbi.idri...@gmail.com> wrote:
>
> I get the following warnings, when trying to save a simple dataframe to
> mysql.:
>
> > C:\...\anaconda3\lib\site-packages\pymysql\cursors.py:170: Warning: (1366,
> > "Incorrect string value: '\\x92\\xE9t\\xE9)' for column 'VARIABLE_VALUE' at
> > row 518")
> result = self._query(query)
>
> And
> > C:\...anaconda3\lib\site-packages\pymysql\cursors.py:170: Warning:
> > (3719, "'utf8' is currently an alias for the character set UTF8MB3,
> > but will be an alias for UTF8MB4 in a future release. Please consider
> > using UTF8MB4 in order to be unambiguous.") result =
> > self._query(query)
>
> Environment info : I use Mysql8, python3.6 (pymysql 0.9.2, sqlalchemy 1.2.1)
>
> I visited posts like the one linked bellow, none of which seem to give a
> solution as to how to avoid this warning.
>
> - [MySQL “incorrect string value” error when save unicode string in
> Django][1] -> Indication is to use UTF8
>
>
> N.B : The Collation in the table within mysql doesn't seem to be set to the
> one I specified in the `create_db` function within the `Connection` class.
>
> The executable code:
>
> import DataEngine.db.Connection as connection
> import random
> import pandas as pd
>
> if __name__ == "__main__":
> conn = connection.Connection(host="host_name", port="3306",
> user="username", password="password")
> conn.create_db("raw_data")
> conn.establish("raw_data")
> l1 = []
> for i in range(100):
> l_nested = []
> for j in range(10):
> l_nested.append(random.randint(0, 100))
> l1.append(l_nested)
> df = pd.DataFrame(l1)
>
> conn.save(df, "random_df")
> # df2 = conn.retrieve("random_df")
>
> My `Connection class`
>
> import sqlalchemy
> import pymysql
> import pandas as pd
>
>
> class Connection:
> def __init__(self: object, host: str, port: str, user: str, password:
> str):
> self.host = host
> self.port = port
> self.user = user
> self.password = password
> self.conn = None
>
> def create_db(self: object, db_name: str, charset: str = "utf8mb4",
> collate:str ="utf8mb4_unicode_ci",drop_if_exists: bool = True):
> c = pymysql.connect(host=self.host, user=self.user,
> password=self.password)
> if drop_if_exists:
> c.cursor().execute("DROP DATABASE IF EXISTS " + db_name)
> c.cursor().execute("CREATE DATABASE " + db_name + " CHARACTER
> SET=" + charset + " COLLATE=" + collate)
> c.close()
> print("Database %s created with a %s charset" % (db_name,
> charset))
>
> def establish(self: object, db_name: str, charset: str = "utf8mb4"):
> self.conn = sqlalchemy.create_engine(
> "mysql+pymysql://" + self.user + ":" + self.password + "@" +
> self.host + ":" + self.port + "/" + db_name +
> "?charset=" + charset)
> print("Connection with database : %s has been established as %s
> at %s." % (db_name, self.user, self.host))
> print("Charset : %s" % charset)
>
> def retrieve(self, table):
> df = pd.read_sql_table(table, self.conn)
> return df
>
> def save(self: object, df: "Pandas.DataFrame", table: str, if_exists:
> str = "replace", chunksize: int = 10000):
> df.to_sql(name=table, con=self.conn, if_exists=if_exists,
> chunksize=chunksize)
>
> Some elements that might help:
> [![Database is of charset utf8mb4][2]][2]
> [![Table columns don't seem to have the correct collation even though I
> specified it when creating the db][3]][3]
>
>
> [1]:
> https://stackoverflow.com/questions/2108824/mysql-incorrect-string-value-error-when-save-unicode-string-in-django
> [2]: https://i.stack.imgur.com/9iAPF.png
> [3]: https://i.stack.imgur.com/qBq6U.png
>
> --
> SQLAlchemy -
> The Python SQL Toolkit and Object Relational Mapper
>
> http://www.sqlalchemy.org/
>
> To post example code, please provide an MCVE: Minimal, Complete, and
> Verifiable Example. See http://stackoverflow.com/help/mcve for a full
> description.
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--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and Verifiable
Example. See http://stackoverflow.com/help/mcve for a full description.
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