composite_drop.go
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package orm
type DropCompositeOptions struct {
IfExists bool
Cascade bool
}
func DropComposite(db DB, model interface{}, opt *DropCompositeOptions) error {
q := NewQuery(db, model)
_, err := q.db.Exec(&dropCompositeQuery{
q: q,
opt: opt,
})
return err
}
type dropCompositeQuery struct {
q *Query
opt *DropCompositeOptions
}
var _ QueryAppender = (*dropCompositeQuery)(nil)
var _ queryCommand = (*dropCompositeQuery)(nil)
func (q *dropCompositeQuery) Clone() queryCommand {
return &dropCompositeQuery{
q: q.q.Clone(),
opt: q.opt,
}
}
func (q *dropCompositeQuery) Query() *Query {
return q.q
}
func (q *dropCompositeQuery) AppendTemplate(b []byte) ([]byte, error) {
return q.AppendQuery(dummyFormatter{}, b)
}
func (q *dropCompositeQuery) AppendQuery(fmter QueryFormatter, b []byte) ([]byte, error) {
if q.q.stickyErr != nil {
return nil, q.q.stickyErr
}
if q.q.model == nil {
return nil, errModelNil
}
b = append(b, "DROP TYPE "...)
if q.opt != nil && q.opt.IfExists {
b = append(b, "IF EXISTS "...)
}
b = append(b, q.q.model.Table().Alias...)
if q.opt != nil && q.opt.Cascade {
b = append(b, " CASCADE"...)
}
return b, q.q.stickyErr
}