Add query package with first set of conditions and tests

database/query/condition-error.go

@@ -0,0 +1,19 @@
+package query
+
+type errorCondition struct {
+	err error
+}
+
+func newErrorCondition(err error) *errorCondition {
+	return &errorCondition{
+		err: err,
+	}
+}
+
+func (c *errorCondition) complies(f Fetcher) bool {
+	return false
+}
+
+func (c *errorCondition) check() error {
+	return c.err
+}