/
database.go
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/
database.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 memory
import (
"strings"
"github.com/Ciyfly/FakerMysql/sql"
)
// Database is an in-memory database.
type Database struct {
*BaseDatabase
views map[string]string
}
type MemoryDatabase interface {
sql.Database
AddTable(name string, t sql.Table)
}
var _ sql.Database = (*Database)(nil)
var _ sql.TableCreator = (*Database)(nil)
var _ sql.TableDropper = (*Database)(nil)
var _ sql.TableRenamer = (*Database)(nil)
var _ sql.TriggerDatabase = (*Database)(nil)
var _ sql.StoredProcedureDatabase = (*Database)(nil)
var _ sql.ViewDatabase = (*Database)(nil)
// BaseDatabase is an in-memory database that can't store views, only for testing the engine
type BaseDatabase struct {
name string
tables map[string]sql.Table
triggers []sql.TriggerDefinition
storedProcedures []sql.StoredProcedureDetails
primaryKeyIndexes bool
}
var _ MemoryDatabase = (*Database)(nil)
var _ MemoryDatabase = (*BaseDatabase)(nil)
// NewDatabase creates a new database with the given name.
func NewDatabase(name string) *Database {
return &Database{
BaseDatabase: NewViewlessDatabase(name),
views: make(map[string]string),
}
}
// NewViewlessDatabase creates a new database that doesn't persist views. Used only for testing. Use NewDatabase.
func NewViewlessDatabase(name string) *BaseDatabase {
return &BaseDatabase{
name: name,
tables: map[string]sql.Table{},
}
}
// EnablePrimaryKeyIndexes causes every table created in this database to use an index on its primary keys
func (d *BaseDatabase) EnablePrimaryKeyIndexes() {
d.primaryKeyIndexes = true
}
// Name returns the database name.
func (d *BaseDatabase) Name() string {
return d.name
}
// Tables returns all tables in the database.
func (d *BaseDatabase) Tables() map[string]sql.Table {
return d.tables
}
func (d *BaseDatabase) GetTableInsensitive(ctx *sql.Context, tblName string) (sql.Table, bool, error) {
tbl, ok := sql.GetTableInsensitive(tblName, d.tables)
return tbl, ok, nil
}
func (d *BaseDatabase) GetTableNames(ctx *sql.Context) ([]string, error) {
tblNames := make([]string, 0, len(d.tables))
for k := range d.tables {
tblNames = append(tblNames, k)
}
return tblNames, nil
}
// HistoryDatabase is a test-only VersionedDatabase implementation. It only supports exact lookups, not AS OF queries
// between two revisions. It's constructed just like its non-versioned sibling, but it can receive updates to particular
// tables via the AddTableAsOf method. Consecutive calls to AddTableAsOf with the same table must install new versions
// of the named table each time, with ascending version identifiers, for this to work.
type HistoryDatabase struct {
*Database
Revisions map[string]map[interface{}]sql.Table
currRevision interface{}
}
var _ sql.VersionedDatabase = (*HistoryDatabase)(nil)
func (db *HistoryDatabase) GetTableInsensitiveAsOf(ctx *sql.Context, tblName string, time interface{}) (sql.Table, bool, error) {
table, ok := db.Revisions[strings.ToLower(tblName)][time]
if ok {
return table, true, nil
}
// If we have revisions for the named table, but not the named revision, consider it not found.
if _, ok := db.Revisions[strings.ToLower(tblName)]; ok {
return nil, false, sql.ErrTableNotFound.New(tblName)
}
// Otherwise (this table has no revisions), return it as an unversioned lookup
return db.GetTableInsensitive(ctx, tblName)
}
func (db *HistoryDatabase) GetTableNamesAsOf(ctx *sql.Context, time interface{}) ([]string, error) {
// TODO: this can't make any queries fail (only used for error messages on table lookup failure), but would be nice
// to support better.
return db.GetTableNames(ctx)
}
func NewHistoryDatabase(name string) *HistoryDatabase {
return &HistoryDatabase{
Database: NewDatabase(name),
Revisions: make(map[string]map[interface{}]sql.Table),
}
}
// Adds a table with an asOf revision key. The table given becomes the current version for the name given.
func (db *HistoryDatabase) AddTableAsOf(name string, t sql.Table, asOf interface{}) {
// TODO: this won't handle table names that vary only in case
if _, ok := db.Revisions[strings.ToLower(name)]; !ok {
db.Revisions[strings.ToLower(name)] = make(map[interface{}]sql.Table)
}
db.Revisions[strings.ToLower(name)][asOf] = t
db.tables[name] = t
}
// AddTable adds a new table to the database.
func (d *BaseDatabase) AddTable(name string, t sql.Table) {
d.tables[name] = t
}
// CreateTable creates a table with the given name and schema
func (d *BaseDatabase) CreateTable(ctx *sql.Context, name string, schema sql.Schema) error {
_, ok := d.tables[name]
if ok {
return sql.ErrTableAlreadyExists.New(name)
}
table := NewTable(name, schema)
if d.primaryKeyIndexes {
table.EnablePrimaryKeyIndexes()
}
d.tables[name] = table
return nil
}
// DropTable drops the table with the given name
func (d *BaseDatabase) DropTable(ctx *sql.Context, name string) error {
_, ok := d.tables[name]
if !ok {
return sql.ErrTableNotFound.New(name)
}
delete(d.tables, name)
return nil
}
func (d *BaseDatabase) RenameTable(ctx *sql.Context, oldName, newName string) error {
tbl, ok := d.tables[oldName]
if !ok {
// Should be impossible (engine already checks this condition)
return sql.ErrTableNotFound.New(oldName)
}
_, ok = d.tables[newName]
if ok {
return sql.ErrTableAlreadyExists.New(newName)
}
tbl.(*Table).name = newName
d.tables[newName] = tbl
delete(d.tables, oldName)
return nil
}
func (d *BaseDatabase) GetTriggers(ctx *sql.Context) ([]sql.TriggerDefinition, error) {
var triggers []sql.TriggerDefinition
for _, def := range d.triggers {
triggers = append(triggers, def)
}
return triggers, nil
}
func (d *BaseDatabase) CreateTrigger(ctx *sql.Context, definition sql.TriggerDefinition) error {
d.triggers = append(d.triggers, definition)
return nil
}
func (d *BaseDatabase) DropTrigger(ctx *sql.Context, name string) error {
found := false
for i, trigger := range d.triggers {
if trigger.Name == name {
d.triggers = append(d.triggers[:i], d.triggers[i+1:]...)
found = true
break
}
}
if !found {
return sql.ErrTriggerDoesNotExist.New(name)
}
return nil
}
// GetStoredProcedures implements sql.StoredProcedureDatabase
func (d *BaseDatabase) GetStoredProcedures(ctx *sql.Context) ([]sql.StoredProcedureDetails, error) {
var spds []sql.StoredProcedureDetails
for _, spd := range d.storedProcedures {
spds = append(spds, spd)
}
return spds, nil
}
// SaveStoredProcedure implements sql.StoredProcedureDatabase
func (d *BaseDatabase) SaveStoredProcedure(ctx *sql.Context, spd sql.StoredProcedureDetails) error {
loweredName := strings.ToLower(spd.Name)
for _, existingSpd := range d.storedProcedures {
if strings.ToLower(existingSpd.Name) == loweredName {
return sql.ErrStoredProcedureAlreadyExists.New(spd.Name)
}
}
d.storedProcedures = append(d.storedProcedures, spd)
return nil
}
// DropStoredProcedure implements sql.StoredProcedureDatabase
func (d *BaseDatabase) DropStoredProcedure(ctx *sql.Context, name string) error {
loweredName := strings.ToLower(name)
found := false
for i, spd := range d.storedProcedures {
if strings.ToLower(spd.Name) == loweredName {
d.storedProcedures = append(d.storedProcedures[:i], d.storedProcedures[i+1:]...)
found = true
break
}
}
if !found {
return sql.ErrStoredProcedureDoesNotExist.New(name)
}
return nil
}
func (d *Database) CreateView(ctx *sql.Context, name string, selectStatement string) error {
_, ok := d.views[name]
if ok {
return sql.ErrExistingView.New(name)
}
d.views[name] = selectStatement
return nil
}
func (d *Database) DropView(ctx *sql.Context, name string) error {
_, ok := d.views[name]
if !ok {
return sql.ErrViewDoesNotExist.New(name)
}
delete(d.views, name)
return nil
}
func (d *Database) AllViews(ctx *sql.Context) ([]sql.ViewDefinition, error) {
var views []sql.ViewDefinition
for name, def := range d.views {
views = append(views, sql.ViewDefinition{
Name: name,
TextDefinition: def,
})
}
return views, nil
}
func (d *Database) GetView(ctx *sql.Context, viewName string) (string, bool, error) {
viewDef, ok := d.views[viewName]
return viewDef, ok, nil
}
type ReadOnlyDatabase struct {
*HistoryDatabase
}
var _ sql.ReadOnlyDatabase = ReadOnlyDatabase{}
func NewReadOnlyDatabase(name string) ReadOnlyDatabase {
h := NewHistoryDatabase(name)
return ReadOnlyDatabase{h}
}
func (d ReadOnlyDatabase) IsReadOnly() bool {
return true
}