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autocommit.go
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autocommit.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 analyzer
import (
"github.com/gabereiser/go-mysql-server/sql"
"github.com/gabereiser/go-mysql-server/sql/plan"
"github.com/gabereiser/go-mysql-server/sql/transform"
)
// addAutocommitNode wraps each query with a TransactionCommittingNode.
func addAutocommitNode(ctx *sql.Context, a *Analyzer, n sql.Node, scope *Scope, sel RuleSelector) (sql.Node, transform.TreeIdentity, error) {
if !n.Resolved() {
return n, transform.SameTree, nil
}
// TODO: This is a bit of a hack. Need to figure out better relationship between new transaction node and warnings.
if hasShowWarningsNode(n) {
return n, transform.SameTree, nil
}
return plan.NewTransactionCommittingNode(n), transform.NewTree, nil
}
func hasShowWarningsNode(n sql.Node) bool {
var ret bool
transform.Inspect(n, func(n sql.Node) bool {
if _, ok := n.(plan.ShowWarnings); ok {
ret = true
return false
}
return true
})
return ret
}
// GetTransactionDatabase returns the name of the database that should be considered current for the transaction about
// to begin. The database is not guaranteed to exist.
// For USE DATABASE statements, we consider the transaction database to be the one being USEd
func GetTransactionDatabase(ctx *sql.Context, parsed sql.Node) string {
var dbName string
switch n := parsed.(type) {
case *plan.QueryProcess, *plan.TransactionCommittingNode, *plan.RowUpdateAccumulator:
return GetTransactionDatabase(ctx, n.(sql.UnaryNode).Child())
case *plan.Use, *plan.CreateProcedure, *plan.DropProcedure, *plan.CreateTrigger, *plan.DropTrigger,
*plan.CreateTable, *plan.InsertInto, *plan.AlterIndex, *plan.AlterAutoIncrement, *plan.AlterPK,
*plan.DropColumn, *plan.RenameColumn, *plan.ModifyColumn:
database := n.(sql.Databaser).Database()
if database != nil {
dbName = database.Name()
}
case *plan.DropForeignKey, *plan.DropIndex, *plan.CreateIndex, *plan.Update, *plan.DeleteFrom,
*plan.CreateForeignKey:
dbName = n.(sql.Databaseable).Database()
case *plan.DropTable:
dbName = getDbHelper(n.Tables...)
case *plan.Truncate:
dbName = getDbHelper(n.Child)
case *plan.AlterDB:
dbName = n.Database(ctx)
default:
}
if dbName != "" {
return dbName
}
return ctx.GetCurrentDatabase()
}
// getDbHelper returns the first database name from a table-like node
func getDbHelper(tables ...sql.Node) string {
if len(tables) == 0 {
return ""
}
switch t := tables[0].(type) {
case *plan.UnresolvedTable:
return t.Database()
case *plan.ResolvedTable:
return t.Database.Name()
case *plan.IndexedTableAccess:
return t.Database().Name()
default:
}
return ""
}