462 lines
11 KiB
Go
462 lines
11 KiB
Go
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// Copyright 2016 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 executor
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import (
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"bytes"
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"fmt"
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"sort"
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"strings"
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"github.com/juju/errors"
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"github.com/pingcap/tidb/ast"
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"github.com/pingcap/tidb/column"
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"github.com/pingcap/tidb/context"
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"github.com/pingcap/tidb/infoschema"
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"github.com/pingcap/tidb/model"
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"github.com/pingcap/tidb/mysql"
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"github.com/pingcap/tidb/privilege"
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"github.com/pingcap/tidb/sessionctx/variable"
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"github.com/pingcap/tidb/table"
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"github.com/pingcap/tidb/util/charset"
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"github.com/pingcap/tidb/util/types"
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)
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// ShowExec represents a show executor.
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type ShowExec struct {
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Tp ast.ShowStmtType // Databases/Tables/Columns/....
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DBName model.CIStr
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Table *ast.TableName // Used for showing columns.
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Column *ast.ColumnName // Used for `desc table column`.
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Flag int // Some flag parsed from sql, such as FULL.
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Full bool
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User string // Used for show grants.
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// Used by show variables
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GlobalScope bool
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fields []*ast.ResultField
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ctx context.Context
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is infoschema.InfoSchema
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fetched bool
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rows []*Row
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cursor int
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}
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// Fields implements Executor Fields interface.
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func (e *ShowExec) Fields() []*ast.ResultField {
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return e.fields
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}
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// Next implements Execution Next interface.
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func (e *ShowExec) Next() (*Row, error) {
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if e.rows == nil {
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err := e.fetchAll()
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if err != nil {
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return nil, errors.Trace(err)
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}
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}
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if e.cursor >= len(e.rows) {
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return nil, nil
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}
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row := e.rows[e.cursor]
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for i, field := range e.fields {
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field.Expr.SetValue(row.Data[i].GetValue())
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}
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e.cursor++
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return row, nil
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}
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func (e *ShowExec) fetchAll() error {
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switch e.Tp {
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case ast.ShowCharset:
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return e.fetchShowCharset()
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case ast.ShowCollation:
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return e.fetchShowCollation()
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case ast.ShowColumns:
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return e.fetchShowColumns()
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case ast.ShowCreateTable:
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return e.fetchShowCreateTable()
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case ast.ShowDatabases:
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return e.fetchShowDatabases()
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case ast.ShowEngines:
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return e.fetchShowEngines()
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case ast.ShowGrants:
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return e.fetchShowGrants()
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case ast.ShowIndex:
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return e.fetchShowIndex()
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case ast.ShowProcedureStatus:
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return e.fetchShowProcedureStatus()
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case ast.ShowStatus:
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return e.fetchShowStatus()
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case ast.ShowTables:
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return e.fetchShowTables()
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case ast.ShowTableStatus:
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return e.fetchShowTableStatus()
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case ast.ShowTriggers:
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return e.fetchShowTriggers()
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case ast.ShowVariables:
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return e.fetchShowVariables()
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case ast.ShowWarnings:
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// empty result
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}
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return nil
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}
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func (e *ShowExec) fetchShowEngines() error {
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row := &Row{
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Data: types.MakeDatums(
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"InnoDB",
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"DEFAULT",
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"Supports transactions, row-level locking, and foreign keys",
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"YES",
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"YES",
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"YES",
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),
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}
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e.rows = append(e.rows, row)
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return nil
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}
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func (e *ShowExec) fetchShowDatabases() error {
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dbs := e.is.AllSchemaNames()
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// TODO: let information_schema be the first database
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sort.Strings(dbs)
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for _, d := range dbs {
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e.rows = append(e.rows, &Row{Data: types.MakeDatums(d)})
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}
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return nil
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}
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func (e *ShowExec) fetchShowTables() error {
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if !e.is.SchemaExists(e.DBName) {
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return errors.Errorf("Can not find DB: %s", e.DBName)
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}
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// sort for tables
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var tableNames []string
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for _, v := range e.is.SchemaTables(e.DBName) {
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tableNames = append(tableNames, v.Meta().Name.L)
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}
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sort.Strings(tableNames)
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for _, v := range tableNames {
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data := types.MakeDatums(v)
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if e.Full {
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// TODO: support "VIEW" later if we have supported view feature.
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// now, just use "BASE TABLE".
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data = append(data, types.NewDatum("BASE TABLE"))
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}
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e.rows = append(e.rows, &Row{Data: data})
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}
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return nil
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}
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func (e *ShowExec) fetchShowTableStatus() error {
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if !e.is.SchemaExists(e.DBName) {
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return errors.Errorf("Can not find DB: %s", e.DBName)
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}
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// sort for tables
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var tableNames []string
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for _, v := range e.is.SchemaTables(e.DBName) {
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tableNames = append(tableNames, v.Meta().Name.L)
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}
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sort.Strings(tableNames)
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for _, v := range tableNames {
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now := mysql.CurrentTime(mysql.TypeDatetime)
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data := types.MakeDatums(v, "InnoDB", "10", "Compact", 100, 100, 100, 100, 100, 100, 100,
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now, now, now, "utf8_general_ci", "", "", "")
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e.rows = append(e.rows, &Row{Data: data})
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}
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return nil
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}
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func (e *ShowExec) fetchShowColumns() error {
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tb, err := e.getTable()
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if err != nil {
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return errors.Trace(err)
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}
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cols := tb.Cols()
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for _, col := range cols {
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if e.Column != nil && e.Column.Name.L != col.Name.L {
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continue
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}
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desc := column.NewColDesc(col)
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// The FULL keyword causes the output to include the column collation and comments,
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// as well as the privileges you have for each column.
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row := &Row{}
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if e.Full {
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row.Data = types.MakeDatums(
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desc.Field,
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desc.Type,
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desc.Collation,
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desc.Null,
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desc.Key,
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desc.DefaultValue,
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desc.Extra,
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desc.Privileges,
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desc.Comment,
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)
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} else {
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row.Data = types.MakeDatums(
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desc.Field,
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desc.Type,
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desc.Null,
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desc.Key,
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desc.DefaultValue,
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desc.Extra,
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)
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}
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e.rows = append(e.rows, row)
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}
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return nil
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}
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func (e *ShowExec) fetchShowIndex() error {
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tb, err := e.getTable()
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if err != nil {
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return errors.Trace(err)
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}
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for _, idx := range tb.Indices() {
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for i, col := range idx.Columns {
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nonUniq := 1
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if idx.Unique {
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nonUniq = 0
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}
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var subPart interface{}
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if col.Length != types.UnspecifiedLength {
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subPart = col.Length
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}
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data := types.MakeDatums(
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tb.Meta().Name.O, // Table
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nonUniq, // Non_unique
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idx.Name.O, // Key_name
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i+1, // Seq_in_index
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col.Name.O, // Column_name
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"utf8_bin", // Colation
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0, // Cardinality
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subPart, // Sub_part
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nil, // Packed
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"YES", // Null
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idx.Tp.String(), // Index_type
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"", // Comment
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idx.Comment, // Index_comment
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)
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e.rows = append(e.rows, &Row{Data: data})
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}
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}
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return nil
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}
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func (e *ShowExec) fetchShowCharset() error {
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// See: http://dev.mysql.com/doc/refman/5.7/en/show-character-set.html
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descs := charset.GetAllCharsets()
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for _, desc := range descs {
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row := &Row{
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Data: types.MakeDatums(
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desc.Name,
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desc.Desc,
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desc.DefaultCollation,
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desc.Maxlen,
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),
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}
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e.rows = append(e.rows, row)
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}
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return nil
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}
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func (e *ShowExec) fetchShowVariables() error {
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sessionVars := variable.GetSessionVars(e.ctx)
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globalVars := variable.GetGlobalVarAccessor(e.ctx)
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for _, v := range variable.SysVars {
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var err error
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var value string
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if !e.GlobalScope {
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// Try to get Session Scope variable value first.
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sv, ok := sessionVars.Systems[v.Name]
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if ok {
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value = sv
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} else {
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// If session scope variable is not set, get the global scope value.
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value, err = globalVars.GetGlobalSysVar(e.ctx, v.Name)
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if err != nil {
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return errors.Trace(err)
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}
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}
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} else {
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value, err = globalVars.GetGlobalSysVar(e.ctx, v.Name)
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if err != nil {
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return errors.Trace(err)
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}
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}
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row := &Row{Data: types.MakeDatums(v.Name, value)}
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e.rows = append(e.rows, row)
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}
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return nil
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}
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func (e *ShowExec) fetchShowStatus() error {
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statusVars, err := variable.GetStatusVars()
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if err != nil {
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return errors.Trace(err)
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}
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for status, v := range statusVars {
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if e.GlobalScope && v.Scope == variable.ScopeSession {
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continue
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}
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value, err := types.ToString(v.Value)
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if err != nil {
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return errors.Trace(err)
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}
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row := &Row{Data: types.MakeDatums(status, value)}
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e.rows = append(e.rows, row)
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}
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return nil
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}
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func (e *ShowExec) fetchShowCreateTable() error {
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tb, err := e.getTable()
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if err != nil {
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return errors.Trace(err)
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}
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// TODO: let the result more like MySQL.
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var buf bytes.Buffer
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buf.WriteString(fmt.Sprintf("CREATE TABLE `%s` (\n", tb.Meta().Name.O))
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for i, col := range tb.Cols() {
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buf.WriteString(fmt.Sprintf(" `%s` %s", col.Name.O, col.GetTypeDesc()))
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if mysql.HasAutoIncrementFlag(col.Flag) {
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buf.WriteString(" NOT NULL AUTO_INCREMENT")
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} else {
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if mysql.HasNotNullFlag(col.Flag) {
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buf.WriteString(" NOT NULL")
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}
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switch col.DefaultValue {
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case nil:
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buf.WriteString(" DEFAULT NULL")
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case "CURRENT_TIMESTAMP":
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buf.WriteString(" DEFAULT CURRENT_TIMESTAMP")
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default:
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buf.WriteString(fmt.Sprintf(" DEFAULT '%v'", col.DefaultValue))
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}
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if mysql.HasOnUpdateNowFlag(col.Flag) {
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buf.WriteString(" ON UPDATE CURRENT_TIMESTAMP")
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}
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}
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if i != len(tb.Cols())-1 {
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buf.WriteString(",\n")
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}
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}
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if len(tb.Indices()) > 0 {
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buf.WriteString(",\n")
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}
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for i, idx := range tb.Indices() {
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if idx.Primary {
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buf.WriteString(" PRIMARY KEY ")
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} else if idx.Unique {
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buf.WriteString(fmt.Sprintf(" UNIQUE KEY `%s` ", idx.Name.O))
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} else {
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buf.WriteString(fmt.Sprintf(" KEY `%s` ", idx.Name.O))
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}
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cols := make([]string, 0, len(idx.Columns))
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for _, c := range idx.Columns {
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cols = append(cols, c.Name.O)
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}
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buf.WriteString(fmt.Sprintf("(`%s`)", strings.Join(cols, "`,`")))
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if i != len(tb.Indices())-1 {
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buf.WriteString(",\n")
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}
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}
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buf.WriteString("\n")
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buf.WriteString(") ENGINE=InnoDB")
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if s := tb.Meta().Charset; len(s) > 0 {
|
||
|
|
buf.WriteString(fmt.Sprintf(" DEFAULT CHARSET=%s", s))
|
||
|
|
} else {
|
||
|
|
buf.WriteString(" DEFAULT CHARSET=latin1")
|
||
|
|
}
|
||
|
|
|
||
|
|
data := types.MakeDatums(tb.Meta().Name.O, buf.String())
|
||
|
|
e.rows = append(e.rows, &Row{Data: data})
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (e *ShowExec) fetchShowCollation() error {
|
||
|
|
collations := charset.GetCollations()
|
||
|
|
for _, v := range collations {
|
||
|
|
isDefault := ""
|
||
|
|
if v.IsDefault {
|
||
|
|
isDefault = "Yes"
|
||
|
|
}
|
||
|
|
row := &Row{Data: types.MakeDatums(
|
||
|
|
v.Name,
|
||
|
|
v.CharsetName,
|
||
|
|
v.ID,
|
||
|
|
isDefault,
|
||
|
|
"Yes",
|
||
|
|
1,
|
||
|
|
)}
|
||
|
|
e.rows = append(e.rows, row)
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (e *ShowExec) fetchShowGrants() error {
|
||
|
|
// Get checker
|
||
|
|
checker := privilege.GetPrivilegeChecker(e.ctx)
|
||
|
|
if checker == nil {
|
||
|
|
return errors.New("Miss privilege checker!")
|
||
|
|
}
|
||
|
|
gs, err := checker.ShowGrants(e.ctx, e.User)
|
||
|
|
if err != nil {
|
||
|
|
return errors.Trace(err)
|
||
|
|
}
|
||
|
|
for _, g := range gs {
|
||
|
|
data := types.MakeDatums(g)
|
||
|
|
e.rows = append(e.rows, &Row{Data: data})
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (e *ShowExec) fetchShowTriggers() error {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (e *ShowExec) fetchShowProcedureStatus() error {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (e *ShowExec) getTable() (table.Table, error) {
|
||
|
|
if e.Table == nil {
|
||
|
|
return nil, errors.New("table not found")
|
||
|
|
}
|
||
|
|
tb, ok := e.is.TableByID(e.Table.TableInfo.ID)
|
||
|
|
if !ok {
|
||
|
|
return nil, errors.Errorf("table %s not found", e.Table.Name)
|
||
|
|
}
|
||
|
|
return tb, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// Close implements Executor Close interface.
|
||
|
|
func (e *ShowExec) Close() error {
|
||
|
|
return nil
|
||
|
|
}
|