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declare_handler.go
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declare_handler.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"
"github.com/dolthub/go-mysql-server/sql"
"github.com/dolthub/go-mysql-server/sql/expression"
)
// DeclareHandler represents the DECLARE ... HANDLER statement.
type DeclareHandler struct {
Action expression.DeclareHandlerAction
Statement sql.Node
Pref *expression.ProcedureReference
Condition expression.HandlerCondition
}
var _ sql.Node = (*DeclareHandler)(nil)
var _ sql.CollationCoercible = (*DeclareHandler)(nil)
var _ sql.DebugStringer = (*DeclareHandler)(nil)
var _ expression.ProcedureReferencable = (*DeclareHandler)(nil)
// NewDeclareHandler returns a new *DeclareHandler node.
func NewDeclareHandler(action expression.DeclareHandlerAction, statement sql.Node, cond expression.HandlerCondition) (*DeclareHandler, error) {
if action == expression.DeclareHandlerAction_Undo {
return nil, sql.ErrDeclareHandlerUndo.New()
}
return &DeclareHandler{
Action: action,
Statement: statement,
Condition: cond,
}, nil
}
// Resolved implements the interface sql.Node.
func (d *DeclareHandler) Resolved() bool {
return true
}
func (d *DeclareHandler) IsReadOnly() bool {
return true
}
// String implements the interface sql.Node.
func (d *DeclareHandler) String() string {
var action string
switch d.Action {
case expression.DeclareHandlerAction_Continue:
action = "CONTINUE"
case expression.DeclareHandlerAction_Exit:
action = "EXIT"
case expression.DeclareHandlerAction_Undo:
action = "UNDO"
}
return fmt.Sprintf("DECLARE %s HANDLER FOR NOT FOUND %s", action, d.Statement.String())
}
// DebugString implements the interface sql.DebugStringer.
func (d *DeclareHandler) DebugString() string {
var action string
switch d.Action {
case expression.DeclareHandlerAction_Continue:
action = "CONTINUE"
case expression.DeclareHandlerAction_Exit:
action = "EXIT"
case expression.DeclareHandlerAction_Undo:
action = "UNDO"
}
return fmt.Sprintf("DECLARE %s HANDLER FOR NOT FOUND %s", action, sql.DebugString(d.Statement))
}
// Schema implements the interface sql.Node.
func (d *DeclareHandler) Schema() sql.Schema {
return nil
}
// Children implements the interface sql.Node.
func (d *DeclareHandler) Children() []sql.Node {
return []sql.Node{d.Statement}
}
// WithChildren implements the interface sql.Node.
func (d *DeclareHandler) WithChildren(children ...sql.Node) (sql.Node, error) {
if len(children) != 1 {
return nil, sql.ErrInvalidChildrenNumber.New(d, len(children), 1)
}
nd := *d
nd.Statement = children[0]
return &nd, nil
}
// CheckPrivileges implements the interface sql.Node.
func (d *DeclareHandler) CheckPrivileges(ctx *sql.Context, opChecker sql.PrivilegedOperationChecker) bool {
return true
}
// CollationCoercibility implements the interface sql.CollationCoercible.
func (*DeclareHandler) CollationCoercibility(ctx *sql.Context) (collation sql.CollationID, coercibility byte) {
return sql.Collation_binary, 7
}
// WithParamReference implements the interface expression.ProcedureReferencable.
func (d *DeclareHandler) WithParamReference(pRef *expression.ProcedureReference) sql.Node {
nd := *d
nd.Pref = pRef
return &nd
}