Python execute multiple sql statements
What would be the suggested way to run something like the following in python: Show
For example, should this be three separate
As you can see, everything is run separately...so I'm not sure if this is a good idea or not (or rather -- what the best way to do the above is). Perhaps asked Jun 25, 2020 at 21:31
David542David542 103k158 gold badges442 silver badges749 bronze badges 6 I would create a stored procedure:
and then just run:
keeping it simple and modular. Of course you should do some kind of error checking and you could even have the stored procedure return a code to indicate success or failure. answered Jul 4, 2020 at 19:27
Dan MDan M 3,8597 silver badges19 bronze badges 4 In the documentation of
You can find another example in the module's source code. answered Jun 28, 2020 at 7:37
Yam MesickaYam Mesicka 5,9037 gold badges43 silver badges62 bronze badges I would not rely on any My experience with MySQLdb and PyMySQL has been that by default they start off in
You can also have a version that handles prepared statements with its parameter list:
For example:
Although, admittedly, the above call only had one SQL prepared statement with parameters. answered Jul 3, 2020 at 12:12
BoobooBooboo 31.3k3 gold badges32 silver badges49 bronze badges 1 Beauty is in the eye of the beholder, so the best way to do something is subjective unless you explicitly tell us how to measure is. There are three hypothetical options I can see:
Optionally, you can also change the query around to avoid some unnecessary work. Regarding the
Regarding option 2. and 3. it is purely a preference on how you would like to view your code. Recall that a connection object has
vs
Python 3.6 introduced f-strings that are super elegant and you should use them if you can. :)
Note that this no longer holds when you start to manipulate rows; in this case, it becomes query specific and you should profile if relevant. A related SO question is What is faster, one big query or many small queries? Finally, it may be more elegant to use
answered Jul 4, 2020 at 5:32
I stuck multiple times in these types of problem in project. After the lot of research i found some points and suggestion.
Suggestion 1-:
Suggestion 2-:
answered Jun 30, 2020 at 21:47
Look at the documentation for MySQLCursor.execute(). It claims that you can pass in a If multi is set to True, execute() is able to execute multiple statements specified in the operation string.
answered Jul 1, 2020 at 0:32
Umutambyi GadUmutambyi Gad 4,0403 gold badges15 silver badges34 bronze badges With you can do following command, just need to replace t1 and episodes, with your own tabaes
While this will run, you must be sure that the foreign key restraints that will be in effect after enabling it, will not cause problems. if tablename is something that a user can enter, you should think about a whitelist of table names. Prepared statemnts don't work with table and column names , so we have to use string replacement to get the correct tablenames at the right posistion, bit this will make your code vulnerable to sql injection The answered Jul 1, 2020 at 2:10
nbknbk 37k6 gold badges27 silver badges40 bronze badges 2
Example code:
Output: [(1,)] [("Dan Clarke's GFG Detective Agency", 'Sean Simpsons', 1987)]
Source: GeeksForGeeks: SQL Using Python Check out this source.. this has lots of great stuff for you. answered Jul 2, 2020 at 20:00
Shivam JhaShivam Jha 2,4602 gold badges20 silver badges32 bronze badges All the answers are completely valid so I'd add my solution with static typing and
If I'm not mistaken connection or cursor might not be a context manager, depending on the version of mysql driver you're having, so that's a pythonic safe solution. answered Jul 2, 2020 at 18:02
Tom WojcikTom Wojcik 4,6924 gold badges27 silver badges40 bronze badges How do I run multiple SQL queries in Python?This has been already discussed in SET 1.. executescript() This is a convenience method for executing multiple SQL statements at once. ... . executemany() It is often the case when, large amount of data has to be inserted into database from Data Files(for simpler case take Lists, arrays). ... . Fetch Large Data. import sqlite3.. How do I run a SQL query in Python?Here are simple steps to getting started.. Step 1 — Importing SQLite and Pandas. To start, we will need to import SQLite into our Jupyter notebook. ... . Step 2 — Connecting your database. ... . Step 3 — Cursor Object. ... . Step 4 — Writing a Query. ... . Step 5 — Running Query. ... . Step 6 — Closing your connection.. How do you run multiple SQL statements in snowflakes?The Snowflake stored procedure below will:. Accept a string parameter that is a SQL statement designed to generate rows of SQL statements to execute.. Execute the input SQL statement to generate a list of SQL statements to run.. Run all statements identified by the “SQL_COMMAND” column one at a time.. Can you have multiple from statements in SQL?You can include multiple SQL statements on the SQL query panel. The exceptions are CALL and CREATE PROCEDURE statements. These statements must be used alone in a query.
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