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bindvar.go
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bindvar.go
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// Copyright 2020-2021 Dolthub, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package expression
import (
"github.com/Rock-liyi/p2pdb-store/sql"
)
type BindVar struct {
Name string
}
func NewBindVar(name string) sql.Expression {
return &BindVar{name}
}
func (bv *BindVar) Resolved() bool {
return true
}
func (bv *BindVar) String() string {
return "BindVar(" + bv.Name + ")"
}
func (bv *BindVar) Type() sql.Type {
return sql.LongText
}
func (bv *BindVar) IsNullable() bool {
return true
}
func (bv *BindVar) Eval(*sql.Context, sql.Row) (interface{}, error) {
return nil, sql.ErrUnboundPreparedStatementVariable.New(bv.Name)
}
func (bv *BindVar) Children() []sql.Expression {
return nil
}
func (bv *BindVar) WithChildren(children ...sql.Expression) (sql.Expression, error) {
if len(children) != 0 {
return nil, sql.ErrInvalidChildrenNumber.New(bv, len(children), 0)
}
return bv, nil
}