forked from dolthub/go-mysql-server
/
show_create_trigger.go
125 lines (110 loc) · 3.89 KB
/
show_create_trigger.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 plan
import (
"fmt"
"strings"
"time"
"github.com/Sndav/go-mysql-server/sql"
)
type ShowCreateTrigger struct {
db sql.Database
TriggerName string
}
var _ sql.Databaser = (*ShowCreateTrigger)(nil)
var _ sql.Node = (*ShowCreateTrigger)(nil)
var showCreateTriggerSchema = sql.Schema{
&sql.Column{Name: "Trigger", Type: sql.LongText, Nullable: false},
&sql.Column{Name: "sql_mode", Type: sql.LongText, Nullable: false},
&sql.Column{Name: "SQL Original Statement", Type: sql.LongText, Nullable: false},
&sql.Column{Name: "character_set_client", Type: sql.LongText, Nullable: false},
&sql.Column{Name: "collation_connection", Type: sql.LongText, Nullable: false},
&sql.Column{Name: "Database Collation", Type: sql.LongText, Nullable: false},
&sql.Column{Name: "Created", Type: sql.Datetime, Nullable: false},
}
// NewShowCreateTrigger creates a new ShowCreateTrigger node for SHOW CREATE TRIGGER statements.
func NewShowCreateTrigger(db sql.Database, trigger string) *ShowCreateTrigger {
return &ShowCreateTrigger{
db: db,
TriggerName: strings.ToLower(trigger),
}
}
// String implements the sql.Node interface.
func (s *ShowCreateTrigger) String() string {
return fmt.Sprintf("SHOW CREATE TRIGGER %s", s.TriggerName)
}
// Resolved implements the sql.Node interface.
func (s *ShowCreateTrigger) Resolved() bool {
_, ok := s.db.(sql.UnresolvedDatabase)
return !ok
}
// Children implements the sql.Node interface.
func (s *ShowCreateTrigger) Children() []sql.Node {
return nil
}
// Schema implements the sql.Node interface.
func (s *ShowCreateTrigger) Schema() sql.Schema {
return showCreateTriggerSchema
}
// RowIter implements the sql.Node interface.
func (s *ShowCreateTrigger) RowIter(ctx *sql.Context, row sql.Row) (sql.RowIter, error) {
triggerDb, ok := s.db.(sql.TriggerDatabase)
if !ok {
return nil, sql.ErrTriggersNotSupported.New(s.db.Name())
}
triggers, err := triggerDb.GetTriggers(ctx)
if err != nil {
return nil, err
}
for _, trigger := range triggers {
if strings.ToLower(trigger.Name) == s.TriggerName {
characterSetClient, err := ctx.GetSessionVariable(ctx, "character_set_client")
if err != nil {
return nil, err
}
collationConnection, err := ctx.GetSessionVariable(ctx, "collation_connection")
if err != nil {
return nil, err
}
collationServer, err := ctx.GetSessionVariable(ctx, "collation_server")
if err != nil {
return nil, err
}
return sql.RowsToRowIter(sql.Row{
trigger.Name, // Trigger
"", // sql_mode
trigger.CreateStatement, // SQL Original Statement
characterSetClient, // character_set_client
collationConnection, // collation_connection
collationServer, // Database Collation
time.Unix(0, 0).UTC(), // Created
}), nil
}
}
return nil, sql.ErrTriggerDoesNotExist.New(s.TriggerName)
}
// WithChildren implements the sql.Node interface.
func (s *ShowCreateTrigger) WithChildren(children ...sql.Node) (sql.Node, error) {
return NillaryWithChildren(s, children...)
}
// Database implements the sql.Databaser interface.
func (s *ShowCreateTrigger) Database() sql.Database {
return s.db
}
// WithDatabase implements the sql.Databaser interface.
func (s *ShowCreateTrigger) WithDatabase(db sql.Database) (sql.Node, error) {
ns := *s
ns.db = db
return &ns, nil
}