func (b *DeleteStmt) Where(query interface{}, value ...interface{}) *DeleteStmt {
	switch query := query.(type) {
	case string:
		b.WhereCond = append(b.WhereCond, Expr(query, value...))
	case Condition:
		b.WhereCond = append(b.WhereCond, query)
	}
	return b
}
Where adds a where condition
package dbr
type DeleteStmt struct {
	raw
	Table string
	WhereCond []Condition
}
func (b *DeleteStmt) Build(d Dialect, buf Buffer) error {
	if b.raw.Query != "" {
		return b.raw.Build(d, buf)
	}
	if b.Table == "" {
		return ErrTableNotSpecified
	}
	buf.WriteString("DELETE FROM ")
	buf.WriteString(d.QuoteIdent(b.Table))
	if len(b.WhereCond) > 0 {
		buf.WriteString(" WHERE ")
		err := And(b.WhereCond...).Build(d, buf)
		if err != nil {
			return err
		}
	}
	return nil
}
func DeleteFrom(table string) *DeleteStmt {
	return &DeleteStmt{
		Table: table,
	}
}
func DeleteBySql(query string, value ...interface{}) *DeleteStmt {
	return &DeleteStmt{
		raw: raw{
			Query: query,
			Value: value,
		},
	}
}