You can test with queries such as: for tables select count(*) from information_schema.tables where table_name = ? this will return a one-row, one-column result set. if the table exists, it will return 1, otherwise it will return 0
for columns: select count(*) from information_schema.columns where table_name = ? and column_name = ? I don't know the solution for foreign key constraints off the top of my head, but the solution can be found in one of the tables in information_schema On Friday, 22 June 2012 23:07:13 UTC+2, toolforger wrote: > > Hi all, > > what's the best practice to test the existence of a > - table > - field in a table > - foreign key constraint? > > Use case: Incremental database schema evolution. > I.e. rows in old and new format are in existence at the same time. > Which means columns from old and new format coexist; old-format columns > will get dropped once the last old-format row is gone. > (Yeah, I like doing crazy stuff :-D ) > -- You received this message because you are subscribed to the Google Groups "H2 Database" group. To view this discussion on the web visit https://groups.google.com/d/msg/h2-database/-/wseNP_jR4XQJ. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/h2-database?hl=en.
