Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I’ve stored an ArrayList of longs (ID’s) into a Blob column.
(followed question: BLOB vs. VARCHAR for storing arrays in a MySQL table)
That works, but now I’ve a problem: how can I search into that BLOB?
Imagine I’ve stored this numbers into the BLOB: 1,2,3,4
And what I want to do is:
SELECT * FROM table WHERE blob_column CONTAINS 3
Is it possible?
The simple answer is “No, it’s not possible”. Your BLOB contains a serialised java object – and the database knows nothing about it’s implementation.
When designing a database, you should always think about how you will need to access the data. In your case, you would be much better off having a separate table, which would contain your ID’s from the list in separate rows. Then you could simply join that table into your query.