How to use variables in SQL statement in Python?
cursor.execute("INSERT INTO table VALUES (%s, %s, %s)", (var1, var2, var3))
Note that the parameters are passed as a tuple.
The database API does proper escaping and quoting of variables. Be careful not to use the string formatting operator (%
), because
- it does not do any escaping or quoting.
- it is prone to Uncontrolled string format attacks e.g. SQL injection.
How to use variables in Python SQL query?
You can use %s
as a placeholder for the bound value:
query = """SELECT * FROM users WHERE email = %s"""
result = cursor.execute(query, (val,))
How to use variables in SQL statement in Python using IN statement
use:
pd.read_sql(f"select id, email from xdb where email in {tuple(df.email.values)}", conn)
Python and Prepared SQL Statements using Variables
Ok I have resolved this issue now.
I had to update the sybase module in order to get it to work with None > NULL.
As posted in the updated question. the below is how I was running the queries.
cursor.execute("SELECT * FROM DB..table where app_name=@app_name", {"@app_name": app_name})
or
params = {"@appname": app.name. "@appver": app.version}
sql = "INSERT INTO DB..table (app_name, app_version) VALUES (@appname, @appversion)
cursor.execute(sql, params)
How to use variable in SQL Alchemy
As Larnu points out in their comment, using f-strings or other string formatting techniques exposes an application to SQL injection attacks, and in any case can be error-prone.
SQLAlchemy supports parameter substitution, allowing values to be safely inserted into SQL statements.
from sqlalchemy import text
# Make a dictionary of values to be inserted into the statement.
values = {'year': 2019}
# Make the statement text into a text instance, with a placeholder for the value.
stmt = text('DELETE FROM [dbo].table1 where dbo.table1.[Year Policy] = :year')
# Execute the query.
result = connection.execute(stmt, values)
Variable table name in BigQuery Python Client
Related Topics
How to Reset Anaconda Root Environment
How to Make a Roll the Dice Command With My Discord Bot
Splitting a Phone Number into a List of Digits: Python
How to Find a Word That Starts With a Specific Character
Convert Images from [-1; 1] to [0; 255]
How to Retrieve SQL Result Column Value Using Column Name in Python
Add Numpy Array as Column to Pandas Data Frame
Python - Get Path of Root Project Structure
How to Sum Multiple Columns in a Spark Dataframe in Pyspark
How to Remove Square Brackets from List in Python
How to Run Two Python Scripts Simultaneously from a Master Script
Reduce Multi-Index/Multi-Level Dataframe to Single Index, Single Level
How to Constantly Run Python Script in the Background on Windows
How to Import a File in Python With Spaces in the Name
Replacing All Negative Values in Certain Columns by Another Value in Pandas
Find Value in Dictionary Using Regex in Python
Save Variables in Every Iteration of for Loop and Load Them Later