I want to select a value one by one from my MySQL table and using this value get some value from different table. After getting the value I want to update my same table with this value.
Can I select and update the table at the same time?
I want to use Java to loop the table selecting values one by one from table.
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Answer
You can set statement to be updatable. Then you can use the setters of the resultset to update any value.
You can also probably solve this in a single sql query but i’ll have to see the tables to create an example.
Like this for instance:
update table_a a set column_name=(select b.new_column_value from table_b b where b.uid=a.uid)
You can also add a where clause to the update to only perform it on some records in table_a