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I need to delete rows in a table, such as
DELETE FROM TABLE_X WHERE COL_A = 0
But I want to not delete any row that can have a constraint violation, and I need to know what rows have this violation…
I know that I can do joins with the relation tables, but i want to know if there exists any generic way to know what lines upon delete will have a constraint violation.
Assuming you use JDBC, there is a Metadata function named GetExportedKeys()
http://docs.oracle.com/javase/7/docs/api/java/sql/DatabaseMetaData.html#getExportedKeys%28java.lang.String,%20java.lang.String,%20java.lang.String%29
Using that, you first get the Foreign Key constraints. Using that information, you construct a Join Statement to catch the violations. You run the statement to get the actual rows that would violate the constraints.