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how to fetch splite3 blob data

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xi on 22 Mar 2019
Edited: Bob S on 5 Nov 2020
sqlite() and fetch() function only works for one of these data types: double, int64, or char, But not for blob binary data chunk. I have two possible solutions:
  1. Use python to fetch the data of blob type and store in dataframe, but need to find a way to convert dataframe to structured data in matlab.
  2. "The sqlite object provides limited Database Toolbox™ functionality. For full functionality, create a database connection to the SQLite database file using the JDBC driver. To use the JDBC driver, close the SQLite connection and create a database connection using the URL string". But I cannot figure out how to do it.
Any suggestions?

Answers (1)

Bob S
Bob S on 5 Nov 2020
Edited: Bob S on 5 Nov 2020
You can access sqlite database tables, and BLOBs, using the Python interface:
>> dbFileName = 'myDatabase.db';
>> tableName = 'myTable'
% Say the field name is data and there is an id field whos value we're after is 300
>> sql = py.importlib.import_module('sqlite3');
>> conn = sql.connect(dbFileName);
>> cur = conn.cursor()
>> query = 'SELECT data FROM myTable WHERE id=300';
>> cur.execute(query);
>> res = cur.fetchone();
% The above returns a Python tuple containing the id and the blob. This gets you the data:
>> data = res{2}.uint8;

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