forked from dolthub/go-mysql-server
/
close.go
102 lines (83 loc) · 2.57 KB
/
close.go
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// Copyright 2022 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 plan
import (
"fmt"
"io"
"github.com/gabereiser/go-mysql-server/sql/expression"
"github.com/gabereiser/go-mysql-server/sql"
)
// Close represents the CLOSE statement, which closes a cursor.
type Close struct {
Name string
pRef *expression.ProcedureReference
}
var _ sql.Node = (*Close)(nil)
var _ expression.ProcedureReferencable = (*Close)(nil)
// NewClose returns a new *Close node.
func NewClose(name string) *Close {
return &Close{
Name: name,
}
}
// Resolved implements the interface sql.Node.
func (c *Close) Resolved() bool {
return true
}
// String implements the interface sql.Node.
func (c *Close) String() string {
return fmt.Sprintf("CLOSE %s", c.Name)
}
// Schema implements the interface sql.Node.
func (c *Close) Schema() sql.Schema {
return nil
}
// Children implements the interface sql.Node.
func (c *Close) Children() []sql.Node {
return nil
}
// WithChildren implements the interface sql.Node.
func (c *Close) WithChildren(children ...sql.Node) (sql.Node, error) {
return NillaryWithChildren(c, children...)
}
// CheckPrivileges implements the interface sql.Node.
func (c *Close) CheckPrivileges(ctx *sql.Context, opChecker sql.PrivilegedOperationChecker) bool {
return true
}
// RowIter implements the interface sql.Node.
func (c *Close) RowIter(ctx *sql.Context, row sql.Row) (sql.RowIter, error) {
return &closeIter{c}, nil
}
// WithParamReference implements the interface expression.ProcedureReferencable.
func (c *Close) WithParamReference(pRef *expression.ProcedureReference) sql.Node {
nc := *c
nc.pRef = pRef
return &nc
}
// closeIter is the sql.RowIter of *Close.
type closeIter struct {
c *Close
}
var _ sql.RowIter = (*closeIter)(nil)
// Next implements the interface sql.RowIter.
func (c *closeIter) Next(ctx *sql.Context) (sql.Row, error) {
if err := c.c.pRef.CloseCursor(ctx, c.c.Name); err != nil {
return nil, err
}
return nil, io.EOF
}
// Close implements the interface sql.RowIter.
func (c *closeIter) Close(ctx *sql.Context) error {
return nil
}