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merging 2 mysql databases with java

Posted on 2016-07-15
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Last Modified: 2016-07-29
Hi,

I need to merge 2 mysql databases with java or python.

The databases are exactly the same in schema but data is different.

in terms of the query which i need to pass in java or python. Anything i should care about?

Would it be the case that i need to insert data to the table having foreign key first?

what is the strategy?

Br.
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Question by:jazzIIIlove
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Expert Comment

by:CEHJ
ID: 41713247
This expert suggested creating a Gigs project.
I don't think there's a 'simple' way to do it. It's just a question of putting the work in
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by:jazzIIIlove
ID: 41725070
Hi,

But any approach you suggest?

Br.
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Expert Comment

by:CEHJ
ID: 41725089
You need to issue a series of queries for each and every table
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Author Comment

by:jazzIIIlove
ID: 41725251
Should i do this e.g
A) Table 2 fk (source): insert into Table 2' fk (target)

B) Table 1 pk (source): insert into Table 1' pk (target)

Should i do in this order (A, B)

Fk: foreign key, Pk: primary key

Prime tables are the tables that will have the merged data
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Expert Comment

by:CEHJ
ID: 41725420
Foreign keys would be a consideration if you are going to get referential integrity violations, yes. In that case, you need to do them in an order that doesn't cause violations
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by:jazzIIIlove
ID: 41726628
Do you think my above order is correct?
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Accepted Solution

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CEHJ earned 500 total points
ID: 41726652
I'm not sure if i understand your notation but the general principle is that the table with a foreign key must be done after the table to which it refers (i.e. the one that contains that key)
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