I am trying to write into my localhost MySQL database.
I have created a database named "test", a table called "price_update" and a row called "model"
When I run the script below I get no errors, however, I also get nothing written to my database.
I am not sure where to start looking for the problem. the row is varchar(10) and collation utf9_general_ci.
import MySQLdb
conn = MySQLdb.connect(host="127.0.0.1",user="someUser",passwd="somePassword",db="test")
query = "INSERT INTO price_update (model) values ('12345')"
x = conn.cursor()
x.execute(query)
row = x.fetchall()
You have to commit the changes:
conn.commit()
Also, I'd make your query safer:
query = "INSERT INTO price_update (model) values (%s)"
...
x.execute(query, ('12345',))
Related
I am using sqlite3 with python, and after connecting to the database and creating a table, sqlite3 shows an error when I try to execute a SELECT statment on the table with the name of the databse in it :
con = sqlite3.connect("my_databse")
cur = con.cursor()
cur.execute('''CREATE TABLE my_table ... ''')
cur.execute("SELECT * FROM my_database.my_table") # this works fine without the name of the database before the table name
but I get this error from sqlite3 :
no such table : my_database.my_table
Is there a way to do a SELECT statment with the name of the database in it ?
The short answer is no you can't do this with SQLite. This is because you already specify the database name with sqlite3.connect() and SQLite3 doesn't allow multiple databases in the same file.
Make sure of the database is in the same directory with the python script. In order to verify this you can use os library and os.listdir() method. After connecting the database and creating the cursor, you can query with the table name.
cur.execute('SELECT * FROM my_table')
I am running this script and want to create a table by passing values in psql query using variables. So, that I can create multiple table in one go. But this cur.execute("CREATE TABLE IF NOT EXISTS(%s, %s)",[table_name, comp_schema]) line is throwing error. How can I write this query to create a table with the given schema?
import psycopg2
conn = psycopg2.connect(database="review_check", user = "xxx", password = "xxx",)
cur = conn.cursor()
print ("Opened database successfully")
comp_schema = """
as_of_date DATE PRIMARY KEY NOT NULL,
verified_reviews INTEGER,
lsa_total_reviews INTEGER
"""
table_name = 'comp_first'
cur.execute("CREATE TABLE IF NOT EXISTS(%s, %s)",[table_name, comp_schema])
conn.commit()
conn.close()
Use the psycopg2.sql module to compose a query dynamically. see https://www.psycopg.org/docs/sql.html.
There's a couple of errors here, in both the SQL syntax and the Python:
cur.execute("CREATE TABLE IF NOT EXISTS(%s, %s)",[table_name, comp_schema])
should be
cur.execute("CREATE TABLE IF NOT EXISTS %s (%s)"%(table_name, comp_schema))
It might be easier during development to build the query in a separate variable first, then print it to see if it looks right:
test = "CREATE TABLE IF NOT EXISTS %s (%s)"%(table_name, comp_schema)
print(test)
>>CREATE TABLE IF NOT EXISTS comp_first (
as_of_date DATE PRIMARY KEY NOT NULL,
verified_reviews INTEGER,
lsa_total_reviews INTEGER
)
I am currently trying to use pyodbc to insert data from a .csv into an Azure SQL Server database. I found a majority of this syntax on Stack Overflow, however for some reason I keep getting one of two different errors.
1) Whenever I use the following code, I get an error that states 'The SQL contains 0 parameter markers, but 7 parameters were supplied'.
import pyodbc
import csv
cnxn = pyodbc.connect('driver', user='username', password='password', database='database')
cnxn.autocommit = True
cursor = cnxn.cursor()
csvfile = open('CSV File')
csv_data = csv.reader(csvfile)
SQL="insert into table([Col1],[Col2],[Col3],[Col4],[Col5],[Col6],[Col7]) values ('?','?','?','?','?','?','?')"
for row in csv_data:
cursor.execute(SQL, row)
time.sleep(1)
cnxn.commit()
cnxn.close()
2) In order to get rid of that error, I am defining the parameter markers by adding '=?' to each of the columns in the insert statement (see code below), however this then gives the following error: ProgrammingError: ('42000'"[42000] [Microsoft] [ODBC SQL Server Driver][SQL Server] Incorrect syntax near '=').
import pyodbc
import csv
cnxn = pyodbc.connect('driver', user='username', password='password', database='database')
cnxn.autocommit = True
cursor = cnxn.cursor()
csvfile = open('CSV File')
csv_data = csv.reader(csvfile)
SQL="insert into table([Col1]=?,[Col2]=?,[Col3]=?,[Col4]=?,[Col5]=?,[Col6]=?,[Col7]=?) values ('?','?','?','?','?','?','?')"
for row in csv_data:
cursor.execute(SQL, row)
time.sleep(1)
cnxn.commit()
cnxn.close()
This is the main error I am haveing trouble with, I have searched all over Stack Overflow and can't seem to find a solution. I know this error is probably very trivial, however I am new to Python and would greatly appreciate any advice or help.
Since SQL server can import your entire CSV file with a single statement this is a reinvention of the wheel.
BULK INSERT my_table FROM 'CSV_FILE'
WITH ( FIELDTERMINATOR=',', ROWTERMINATOR='\n');
If you want to persist with using python, just execute the above query with pyodbc!
If you would still prefer to execute thousands of statements instead of just one
SQL="insert into table([Col1],[Col2],[Col3],[Col4],[Col5],[Col6],[Col7]) values (?,?,?,?,?,?,?)"
note that the ' sorrounding the ? shouldn't be there.
# creating column list for insertion
colsInsert = "["+"],[".join([str(i) for i in mydata.columns.tolist()]) +']'
# Insert DataFrame recrds one by one.
for i,row in mydata.iterrows():
sql = "INSERT INTO Test (" +colsInsert + ") VALUES (" + "%?,"*(len(row)-1) + "%?)"
cursor.execute(sql, tuple(row))
# cursor.execute(sql, tuple(row))
# the connection is not autocommitted by default, so we must commit to save our changes
c.commit()
I have just started using MySQLdb in python. I am able to create table but when I try to insert, no rows are inserted into the table and its shows that table is still empty.
import MySQLdb
db = MySQLdb.connect("localhost","root","shivam","test")
cursor = db.cursor()
s = "DROP TABLE IF EXISTS batting"
cursor.execute(s)
s = """create table batting (
name varchar(50) primary key,
matches integer(5),
innings integer(5),
runs integer(5),
highest integer(3),
strikerate integer(3),
hundreds integer(3),
fifties integer(3)
)"""
cursor.execute(s)
s = """insert into batting(name) values(
"shivam")"""
cursor.execute(s)
db.close()
Where I could be going wrong?
You forgot to commit your connection. Simply add:
cursor.execute(s)
db.commit()
Have a look at this. It explains why you need to commit
My simple test code is listed below. I created the table already and can query it using the SQLite Manager add-in on Firefox so I know the table and data exist. When I run the query in python (and using the python shell) I get the no such table error
def TroyTest(self, acctno):
conn = sqlite3.connect('TroyData.db')
curs = conn.cursor()
v1 = curs.execute('''
SELECT acctvalue
FROM balancedata
WHERE acctno = ? ''', acctno)
print v1
conn.close()
When you pass SQLite a non-existing path, it'll happily open a new database for you, instead of telling you that the file did not exist before. When you do that, it'll be empty and you'll instead get a "No such table" error.
You are using a relative path to the database, meaning it'll try to open the database in the current directory, and that is probably not where you think it is..
The remedy is to use an absolute path instead:
conn = sqlite3.connect('/full/path/to/TroyData.db')
You need to loop over the cursor to see results:
curs.execute('''
SELECT acctvalue
FROM balancedata
WHERE acctno = ? ''', acctno)
for row in curs:
print row[0]
or call fetchone():
print curs.fetchone() # prints whole row tuple
The problem is the SQL statment. you must specify the db name and after the table name...
'''SELECT * FROM db_name.table_name WHERE acctno = ? '''