snapshot of https://github.com/ent/ent.git (master, 2026-09-15; blobs > 131072B omitted)

examples/triggers/schema.sql

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+-- Function to audit changes in the users table.
+CREATE OR REPLACE FUNCTION audit_users_changes()
+RETURNS TRIGGER AS $$
+BEGIN
+    IF (TG_OP = 'INSERT') THEN
+        INSERT INTO user_audit_logs(operation_type, operation_time, new_value)
+        VALUES (TG_OP, CURRENT_TIMESTAMP, row_to_json(NEW));
+        RETURN NEW;
+    ELSIF (TG_OP = 'UPDATE') THEN
+        INSERT INTO user_audit_logs(operation_type, operation_time, old_value, new_value)
+        VALUES (TG_OP, CURRENT_TIMESTAMP, row_to_json(OLD), row_to_json(NEW));
+        RETURN NEW;
+    ELSIF (TG_OP = 'DELETE') THEN
+        INSERT INTO user_audit_logs(operation_type, operation_time, old_value)
+        VALUES (TG_OP, CURRENT_TIMESTAMP, row_to_json(OLD));
+        RETURN OLD;
+    END IF;
+    RETURN NULL;
+END;
+$$ LANGUAGE plpgsql;
+
+-- Trigger for INSERT operations.
+CREATE TRIGGER users_insert_audit AFTER INSERT ON users FOR EACH ROW EXECUTE FUNCTION audit_users_changes();
+
+-- Trigger for UPDATE operations.
+CREATE TRIGGER users_update_audit AFTER UPDATE ON users FOR EACH ROW EXECUTE FUNCTION audit_users_changes();
+
+-- Trigger for DELETE operations.
+CREATE TRIGGER users_delete_audit AFTER DELETE ON users FOR EACH ROW EXECUTE FUNCTION audit_users_changes();