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dbddl.go
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dbddl.go
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// Copyright 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"
"github.com/Ciyfly/vitess/go/mysql"
"github.com/Ciyfly/vitess/go/vt/sqlparser"
"github.com/Ciyfly/FakerMysql/sql"
)
// CreateDB creates an in memory database that lasts the length of the process only.
type CreateDB struct {
Catalog sql.Catalog
dbName string
IfNotExists bool
}
func (c CreateDB) Resolved() bool {
return true
}
func (c CreateDB) String() string {
ifNotExists := ""
if c.IfNotExists {
ifNotExists = " if not exists"
}
return fmt.Sprintf("%s database%s %v", sqlparser.CreateStr, ifNotExists, c.dbName)
}
func (c CreateDB) Schema() sql.Schema {
return sql.OkResultSchema
}
func (c CreateDB) Children() []sql.Node {
return nil
}
func (c CreateDB) RowIter(ctx *sql.Context, row sql.Row) (sql.RowIter, error) {
exists := c.Catalog.HasDB(c.dbName)
rows := []sql.Row{{sql.OkResult{RowsAffected: 1}}}
if exists {
if c.IfNotExists {
ctx.Session.Warn(&sql.Warning{
Level: "Note",
Code: mysql.ERDbCreateExists,
Message: fmt.Sprintf("Can't create database %s; database exists ", c.dbName),
})
return sql.RowsToRowIter(rows...), nil
} else {
return nil, sql.ErrCannotCreateDatabaseExists.New(c.dbName)
}
}
err := c.Catalog.CreateDatabase(ctx, c.dbName)
if err != nil {
return nil, err
}
return sql.RowsToRowIter(rows...), nil
}
func (c CreateDB) WithChildren(children ...sql.Node) (sql.Node, error) {
return NillaryWithChildren(c, children...)
}
func NewCreateDatabase(dbName string, ifNotExists bool) *CreateDB {
return &CreateDB{
dbName: dbName,
IfNotExists: ifNotExists,
}
}
// DropDB removes a databases from the Catalog and updates the active database if it gets removed itself.
type DropDB struct {
Catalog sql.Catalog
dbName string
IfExists bool
}
func (d DropDB) Resolved() bool {
return true
}
func (d DropDB) String() string {
ifExists := ""
if d.IfExists {
ifExists = " if exists"
}
return fmt.Sprintf("%s database%s %v", sqlparser.DropStr, ifExists, d.dbName)
}
func (d DropDB) Schema() sql.Schema {
return sql.OkResultSchema
}
func (d DropDB) Children() []sql.Node {
return nil
}
func (d DropDB) RowIter(ctx *sql.Context, row sql.Row) (sql.RowIter, error) {
exists := d.Catalog.HasDB(d.dbName)
if !exists {
if d.IfExists {
ctx.Session.Warn(&sql.Warning{
Level: "Note",
Code: mysql.ERDbDropExists,
Message: fmt.Sprintf("Can't drop database %s; database doesn't exist ", d.dbName),
})
rows := []sql.Row{{sql.OkResult{RowsAffected: 0}}}
return sql.RowsToRowIter(rows...), nil
} else {
return nil, sql.ErrCannotDropDatabaseDoesntExist.New(d.dbName)
}
}
err := d.Catalog.RemoveDatabase(ctx, d.dbName)
if err != nil {
return nil, err
}
// Unsets the current database
if ctx.GetCurrentDatabase() == d.dbName {
ctx.SetCurrentDatabase("")
}
rows := []sql.Row{{sql.OkResult{RowsAffected: 1}}}
return sql.RowsToRowIter(rows...), nil
}
func (d DropDB) WithChildren(children ...sql.Node) (sql.Node, error) {
return NillaryWithChildren(d, children...)
}
func NewDropDatabase(dbName string, ifExists bool) *DropDB {
return &DropDB{
dbName: dbName,
IfExists: ifExists,
}
}