Can't get MySQL source query to work using Python mysqldb module

Question

I have the following lines of code:

sql = \"source C:\\\\My Dropbox\\\\workspace\\\\projects\\\\hosted_inv\\\\create_site_db.sql\"
cursor.execute (sql)


        

Answer 1

I believe the "source" command is specific to the mysql shell executable - it is not an sql command and cannot be interpreted correctly when executed as an sql statement.

To achieve your goal, you probably need to read your script file and parse it into individual sql statements, then execute them one at a time with your cursor.

Answer 2

I ran into the same problem!

As a solution I installed the library sqlparse and used the sqlparse.split( sql ) results. I had to check that sql_parts don't include blank lines as solo statements... Otherwise "WOW" sqlparse is pretty great and exactly what I needed!

import sqlparse 
....
sql = open("test.sql").read()
sql_parts = sqlparse.split( sql )
for sql_part in sql_parts:
    if sql_part.strip() ==  '':
        continue 
    cursor.execute( sql_part )

FYI: If you do not run each statement on its own you may get the error "Commands out of sync; you can't run this command now". I only got this error after I added some more queries to my sql file - not the first time around.

Answer 3

The source command is one of the built-in commands recognized only by the mysql command-line client. It is not supported as a statement you can execute via any API.

Some people think you can simply split an SQL script file on the ";" statement terminator and call execute() on each line you get. But there are numerous exception cases:

• Statements that are built-in commands like CONNECT, SOURCE, CHARSET, WARNINGS, QUIT, etc.
• Note that built-in commands don't need to terminate in ; for example DELIMITER.
• Statements that contain ; but not as a terminator, like CREATE TRIGGER.
• Statements that contain ; inside string literals or comments or even quoted identifiers.
• Comments lines.

To load an SQL script programmatically, you'd have to duplicate a fair amount of the functionality of the mysql client. So it's best if you just fork a process to actually execute that client program with the script as input.

See also:

• Loading .sql files from within PHP
• is it possible to call a sql script from a stored procedure in another sql script?
• composing multiple mysql scripts
• Running Database scripts in C#

Answer 4

As others said, you cannot use the command source in MySQLdb Python API

So, instead of running that, load the file and execute it

Lets say your .sql file has

create database test;

Read the content like

sql=open("test.sql").read()

And then execute it

cursor.execute(sql);

You will get new database "test"

Answer 5

'source' is not an SQL command, but an internal command of the mysql command line client.