134 lines
3.6 KiB
Go
134 lines
3.6 KiB
Go
// Copyright 2015 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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// See the License for the specific language governing permissions and
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// limitations under the License.
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package model
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import (
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"strings"
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"github.com/pingcap/tidb/util/types"
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)
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// ColumnInfo provides meta data describing of a table column.
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type ColumnInfo struct {
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ID int64 `json:"id"`
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Name CIStr `json:"name"`
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Offset int `json:"offset"`
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DefaultValue interface{} `json:"default"`
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types.FieldType `json:"type"`
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}
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// Clone clones ColumnInfo
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func (c *ColumnInfo) Clone() *ColumnInfo {
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nc := *c
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return &nc
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}
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// TableInfo provides meta data describing a DB table.
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type TableInfo struct {
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ID int64 `json:"id"`
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Name CIStr `json:"name"`
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Charset string `json:"charset"`
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Collate string `json:"collate"`
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// Columns are listed in the order in which they appear in the schema.
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Columns []*ColumnInfo `json:"cols"`
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Indices []*IndexInfo `json:"index_info"`
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}
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// Clone clones TableInfo
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func (t *TableInfo) Clone() *TableInfo {
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nt := *t
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nt.Columns = make([]*ColumnInfo, len(t.Columns))
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nt.Indices = make([]*IndexInfo, len(t.Indices))
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for i := range t.Columns {
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nt.Columns[i] = t.Columns[i].Clone()
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}
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for i := range t.Indices {
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nt.Indices[i] = t.Indices[i].Clone()
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}
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return &nt
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}
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// IndexColumn provides index column info.
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type IndexColumn struct {
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Name CIStr `json:"name"` // Index name
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Offset int `json:"offset"` // Index offset
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Length int `json:"length"` // Index length
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}
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// Clone clones IndexColumn
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func (i *IndexColumn) Clone() *IndexColumn {
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ni := *i
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return &ni
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}
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// IndexInfo provides meta data describing a DB index.
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// It corresponds to the statement `CREATE INDEX Name ON Table (Column);`
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// See: https://dev.mysql.com/doc/refman/5.7/en/create-index.html
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type IndexInfo struct {
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Name CIStr `json:"idx_name"` // Index name.
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Table CIStr `json:"tbl_name"` // Table name.
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Columns []*IndexColumn `json:"idx_cols"` // Index columns.
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Unique bool `json:"is_unique"` // Whether the index is unique.
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Primary bool `json:"is_primary"` // Whether the index is primary key.
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}
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// Clone clones IndexInfo
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func (index *IndexInfo) Clone() *IndexInfo {
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ni := *index
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ni.Columns = make([]*IndexColumn, len(index.Columns))
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for i := range index.Columns {
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ni.Columns[i] = index.Columns[i].Clone()
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}
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return &ni
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}
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// DBInfo provides meta data describing a DB.
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type DBInfo struct {
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ID int64 `json:"id"` // Database ID
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Name CIStr `json:"db_name"` // DB name.
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Charset string `json:"charset"`
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Collate string `json:"collate"`
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Tables []*TableInfo `json:"-"` // Tables in the DB.
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}
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// Clone clones DBInfo
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func (db *DBInfo) Clone() *DBInfo {
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newInfo := *db
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newInfo.Tables = make([]*TableInfo, len(db.Tables))
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for i := range db.Tables {
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newInfo.Tables[i] = db.Tables[i].Clone()
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}
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return &newInfo
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}
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// CIStr is case insensitve string.
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type CIStr struct {
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O string `json:"O"` // Original string.
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L string `json:"L"` // Lower case string.
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}
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// String implements fmt.Stringer interface.
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func (cis CIStr) String() string {
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return cis.O
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}
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// NewCIStr creates a new CIStr.
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func NewCIStr(s string) (cs CIStr) {
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cs.O = s
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cs.L = strings.ToLower(s)
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return
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}
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