Convert a huge SQL file to CSV

[Steven Schveighoffer]

On 6/3/18 2:04 AM, biocyberman wrote:
> On Friday, 1 June 2018 at 10:15:11 UTC, Martin Tschierschke wrote:
>> On Friday, 1 June 2018 at 09:49:23 UTC, biocyberman wrote:
>>> I need to convert a compressed 17GB SQL dump to CSV. A workable 
>>> solution is to create a temporary mysql database, import the dump, 
>>> query by python, and export. But i wonder if there is something 
>>> someway in D to parse the SQL file directly and query and export the 
>>> data. I imagine this will envolve both parsing and querying because 
>>> the data is stored in several tables. I am in the process of 
>>> downloading the dump now so I can’t give excerpt of the data.
>>
>> You don't need python:
>> https://michaelrigart.be/export-directly-mysql-csv/
>>
>> SELECT field1, field2
>> FROM table1
>> INTO OUTFILE '/path/to/file.csv'
>> FIELDS TERMINATED BY ','
>> ENCLOSED BY '"'
>> FIELDS ESCAPED BY '\'
>> LINES TERMINATED BY '\n';
>>
>> Most important:
>>
>> INTO OUTFILE : here you state the path where you want MySQL to store 
>> the CSV file. Keep in mind that the path needs to be writeable for the 
>> MySQL user
>>
>> You can write a parser for SQL in D, but even if the import into mysql 
>> would take some time, it's only compute time and not yours.
>>
>>
>> Regards mt.
> 
> Ah yes, thank you Martin. I forgot that we can do a "batch" SQL query 
> where mysql server can parse and run query commands. So no need for 
> Python. But I am still currently waiting for the import to  finish the 
> importing of mysql dump. It took 18 hours and is still counting! The 
> whole mysql database is 68GB at the moment. Can we avoid the import and 
> query the database dump directly?

Well, it could be done quick-and-dirty by simply ignoring most of SQL 
syntax, and focusing on the actual things used in the dump. mysqldump is 
pretty consistent with how it outputs data.

You might even be able to do it with an awk script :)

-Steve