49 lines
2.1 KiB
Go
49 lines
2.1 KiB
Go
// Copyright 2024 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package infoschema
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import (
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stdctx "context"
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"github.com/pingcap/tidb/pkg/infoschema/context"
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"github.com/pingcap/tidb/pkg/meta/autoid"
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"github.com/pingcap/tidb/pkg/meta/model"
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"github.com/pingcap/tidb/pkg/parser/ast"
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"github.com/pingcap/tidb/pkg/table"
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)
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// InfoSchema is the interface used to retrieve the schema information.
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// It works as a in memory cache and doesn't handle any schema change.
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// InfoSchema is read-only, and the returned value is a copy.
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type InfoSchema interface {
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context.MetaOnlyInfoSchema
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TableByName(ctx stdctx.Context, schema, table ast.CIStr) (table.Table, error)
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TableByID(ctx stdctx.Context, id int64) (table.Table, bool)
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// TableItemByID returns a lightweight table meta specified by the given ID,
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// without loading the whole info from storage.
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// So it's all in memory operation. No need to worry about network or disk cost.
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TableItemByID(id int64) (TableItem, bool)
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// TableIDByPartitionID is a pure memory operation, returns the table ID by the partition ID.
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// It's all in memory operation. No need to worry about network or disk cost.
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TableIDByPartitionID(partitionID int64) (tableID int64, ok bool)
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FindTableByPartitionID(partitionID int64) (table.Table, *model.DBInfo, *model.PartitionDefinition)
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// TableItemByPartitionID returns a lightweight table meta specified by the partition ID,
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// without loading the whole info from storage.
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// So it's all in memory operation. No need to worry about network or disk cost.
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TableItemByPartitionID(partitionID int64) (TableItem, bool)
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GetAutoIDRequirement() autoid.Requirement
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base() *infoSchema
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}
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