/
delete.go
75 lines (70 loc) · 1.37 KB
/
delete.go
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package morm
import (
"github.com/NotFound1911/morm/errors"
)
type Deleter[T any] struct {
builder
sess session
}
func (d *Deleter[T]) Build() (*Query, error) {
var (
t T
err error
)
d.model, err = d.r.Get(&t)
if err != nil {
return nil, err
}
d.sqlBuilder.WriteString("DELETE FROM ")
if err = d.buildTable(d.table); err != nil {
return nil, err
}
// 构造where
if len(d.where) > 0 {
d.sqlBuilder.WriteString(" WHERE ")
if err := d.buildPredicates(d.where); err != nil {
return nil, err
}
}
d.sqlBuilder.WriteString(";")
return &Query{
SQL: d.sqlBuilder.String(),
Args: d.args,
}, nil
}
func (d *Deleter[T]) buildTable(table TableReference) error {
switch tab := table.(type) {
case nil:
d.quote(d.model.TableName)
case Table:
model, err := d.r.Get(tab.entity)
if err != nil {
return err
}
d.quote(model.TableName)
default:
return errs.NewErrUnsupportedExpressionType(tab)
}
return nil
}
// From accepts model definition
func (d *Deleter[T]) From(table TableReference) *Deleter[T] {
d.table = table
return d
}
// Where accepts predicates
func (d *Deleter[T]) Where(ps ...Predicate) *Deleter[T] {
d.where = ps
return d
}
func NewDeleter[T any](sess session) *Deleter[T] {
c := sess.getCore()
return &Deleter[T]{
sess: sess,
builder: builder{
core: c,
dialect: c.dialect,
quoter: c.dialect.quoter(),
},
}
}