How do I disable FOREIGN KEY checking for the time of database schema migration?

How do I disable FOREIGN KEY checking for the time of database schema migration?
Currently I found engine-based commands like:
  • PostgreSQL: SET CONSTRAINTS ALL DEFERRED;
  • MSSQL: EXEC sp_msforeachtable "ALTER TABLE ? NOCHECK CONSTRAINT all";
  • MySQL: SET FOREIGN_KEY_CHECKS = 0;
  • HSQLDB: SET REFERENTIAL_INTEGRITY FALSE;
  • DB2: SET INTEGRITY FOR table OFF;
  • SQLite 3.7.16: PRAGMA foreign_keys = false;
  • Oracle 11g seems to have no such command at all
Syntax significantly differ, in case of MSSQL I'm unable to recover previously disabled constraints (if any).

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