611 lines
15 KiB
Go
611 lines
15 KiB
Go
// Copyright 2016 PingCAP, 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,
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package executor
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"sort"
|
|
"strings"
|
|
"time"
|
|
|
|
"github.com/juju/errors"
|
|
"github.com/pingcap/tidb/ast"
|
|
"github.com/pingcap/tidb/context"
|
|
"github.com/pingcap/tidb/expression"
|
|
"github.com/pingcap/tidb/infoschema"
|
|
"github.com/pingcap/tidb/model"
|
|
"github.com/pingcap/tidb/mysql"
|
|
"github.com/pingcap/tidb/privilege"
|
|
"github.com/pingcap/tidb/sessionctx/variable"
|
|
"github.com/pingcap/tidb/sessionctx/varsutil"
|
|
"github.com/pingcap/tidb/table"
|
|
"github.com/pingcap/tidb/terror"
|
|
"github.com/pingcap/tidb/util/charset"
|
|
"github.com/pingcap/tidb/util/types"
|
|
)
|
|
|
|
// ShowExec represents a show executor.
|
|
type ShowExec struct {
|
|
Tp ast.ShowStmtType // Databases/Tables/Columns/....
|
|
DBName model.CIStr
|
|
Table *ast.TableName // Used for showing columns.
|
|
Column *ast.ColumnName // Used for `desc table column`.
|
|
Flag int // Some flag parsed from sql, such as FULL.
|
|
Full bool
|
|
User string // Used for show grants.
|
|
|
|
// Used by show variables
|
|
GlobalScope bool
|
|
|
|
schema *expression.Schema
|
|
ctx context.Context
|
|
is infoschema.InfoSchema
|
|
|
|
fetched bool
|
|
rows []*Row
|
|
cursor int
|
|
}
|
|
|
|
// Schema implements the Executor Schema interface.
|
|
func (e *ShowExec) Schema() *expression.Schema {
|
|
return e.schema
|
|
}
|
|
|
|
// Next implements Execution Next interface.
|
|
func (e *ShowExec) Next() (*Row, error) {
|
|
if e.rows == nil {
|
|
err := e.fetchAll()
|
|
if err != nil {
|
|
return nil, errors.Trace(err)
|
|
}
|
|
}
|
|
if e.cursor >= len(e.rows) {
|
|
return nil, nil
|
|
}
|
|
row := e.rows[e.cursor]
|
|
e.cursor++
|
|
return row, nil
|
|
}
|
|
|
|
func (e *ShowExec) fetchAll() error {
|
|
switch e.Tp {
|
|
case ast.ShowCharset:
|
|
return e.fetchShowCharset()
|
|
case ast.ShowCollation:
|
|
return e.fetchShowCollation()
|
|
case ast.ShowColumns:
|
|
return e.fetchShowColumns()
|
|
case ast.ShowCreateTable:
|
|
return e.fetchShowCreateTable()
|
|
case ast.ShowCreateDatabase:
|
|
return e.fetchShowCreateDatabase()
|
|
case ast.ShowDatabases:
|
|
return e.fetchShowDatabases()
|
|
case ast.ShowEngines:
|
|
return e.fetchShowEngines()
|
|
case ast.ShowGrants:
|
|
return e.fetchShowGrants()
|
|
case ast.ShowIndex:
|
|
return e.fetchShowIndex()
|
|
case ast.ShowProcedureStatus:
|
|
return e.fetchShowProcedureStatus()
|
|
case ast.ShowStatus:
|
|
return e.fetchShowStatus()
|
|
case ast.ShowTables:
|
|
return e.fetchShowTables()
|
|
case ast.ShowTableStatus:
|
|
return e.fetchShowTableStatus()
|
|
case ast.ShowTriggers:
|
|
return e.fetchShowTriggers()
|
|
case ast.ShowVariables:
|
|
return e.fetchShowVariables()
|
|
case ast.ShowWarnings:
|
|
return e.fetchShowWarnings()
|
|
case ast.ShowProcessList:
|
|
return e.fetchShowProcessList()
|
|
case ast.ShowEvents:
|
|
// empty result
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (e *ShowExec) fetchShowEngines() error {
|
|
row := &Row{
|
|
Data: types.MakeDatums(
|
|
"InnoDB",
|
|
"DEFAULT",
|
|
"Supports transactions, row-level locking, and foreign keys",
|
|
"YES",
|
|
"YES",
|
|
"YES",
|
|
),
|
|
}
|
|
e.rows = append(e.rows, row)
|
|
return nil
|
|
}
|
|
|
|
func (e *ShowExec) fetchShowDatabases() error {
|
|
dbs := e.is.AllSchemaNames()
|
|
// TODO: let information_schema be the first database
|
|
sort.Strings(dbs)
|
|
for _, d := range dbs {
|
|
e.rows = append(e.rows, &Row{Data: types.MakeDatums(d)})
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (e *ShowExec) fetchShowProcessList() error {
|
|
sm := e.ctx.GetSessionManager()
|
|
if sm == nil {
|
|
return nil
|
|
}
|
|
|
|
pl := sm.ShowProcessList()
|
|
for _, pi := range pl {
|
|
var t uint64
|
|
if len(pi.Info) != 0 {
|
|
t = uint64(time.Since(pi.Time) / time.Second)
|
|
}
|
|
row := &Row{
|
|
Data: []types.Datum{
|
|
types.NewUintDatum(pi.ID),
|
|
types.NewStringDatum(pi.User),
|
|
types.NewStringDatum(pi.Host),
|
|
types.NewStringDatum(pi.DB),
|
|
types.NewStringDatum(pi.Command),
|
|
types.NewUintDatum(t),
|
|
types.NewStringDatum(fmt.Sprintf("%d", pi.State)),
|
|
types.NewStringDatum(pi.Info),
|
|
},
|
|
}
|
|
e.rows = append(e.rows, row)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (e *ShowExec) fetchShowTables() error {
|
|
if !e.is.SchemaExists(e.DBName) {
|
|
return errors.Errorf("Can not find DB: %s", e.DBName)
|
|
}
|
|
// sort for tables
|
|
var tableNames []string
|
|
for _, v := range e.is.SchemaTables(e.DBName) {
|
|
tableNames = append(tableNames, v.Meta().Name.O)
|
|
}
|
|
sort.Strings(tableNames)
|
|
for _, v := range tableNames {
|
|
data := types.MakeDatums(v)
|
|
if e.Full {
|
|
// TODO: support "VIEW" later if we have supported view feature.
|
|
// now, just use "BASE TABLE".
|
|
data = append(data, types.NewDatum("BASE TABLE"))
|
|
}
|
|
e.rows = append(e.rows, &Row{Data: data})
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (e *ShowExec) fetchShowTableStatus() error {
|
|
if !e.is.SchemaExists(e.DBName) {
|
|
return errors.Errorf("Can not find DB: %s", e.DBName)
|
|
}
|
|
|
|
// sort for tables
|
|
tables := e.is.SchemaTables(e.DBName)
|
|
sort.Sort(table.Slice(tables))
|
|
|
|
for _, t := range tables {
|
|
now := types.CurrentTime(mysql.TypeDatetime)
|
|
data := types.MakeDatums(t.Meta().Name.O, "InnoDB", "10", "Compact", 100, 100, 100, 100, 100, 100, 100,
|
|
now, now, now, "utf8_general_ci", "", "", t.Meta().Comment)
|
|
e.rows = append(e.rows, &Row{Data: data})
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (e *ShowExec) fetchShowColumns() error {
|
|
tb, err := e.getTable()
|
|
if err != nil {
|
|
return errors.Trace(err)
|
|
}
|
|
cols := tb.Cols()
|
|
for _, col := range cols {
|
|
if e.Column != nil && e.Column.Name.L != col.Name.L {
|
|
continue
|
|
}
|
|
|
|
desc := table.NewColDesc(col)
|
|
|
|
// The FULL keyword causes the output to include the column collation and comments,
|
|
// as well as the privileges you have for each column.
|
|
row := &Row{}
|
|
if e.Full {
|
|
row.Data = types.MakeDatums(
|
|
desc.Field,
|
|
desc.Type,
|
|
desc.Collation,
|
|
desc.Null,
|
|
desc.Key,
|
|
desc.DefaultValue,
|
|
desc.Extra,
|
|
desc.Privileges,
|
|
desc.Comment,
|
|
)
|
|
} else {
|
|
row.Data = types.MakeDatums(
|
|
desc.Field,
|
|
desc.Type,
|
|
desc.Null,
|
|
desc.Key,
|
|
desc.DefaultValue,
|
|
desc.Extra,
|
|
)
|
|
}
|
|
e.rows = append(e.rows, row)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (e *ShowExec) fetchShowIndex() error {
|
|
tb, err := e.getTable()
|
|
if err != nil {
|
|
return errors.Trace(err)
|
|
}
|
|
if tb.Meta().PKIsHandle {
|
|
var pkCol *table.Column
|
|
for _, col := range tb.Cols() {
|
|
if mysql.HasPriKeyFlag(col.Flag) {
|
|
pkCol = col
|
|
break
|
|
}
|
|
}
|
|
data := types.MakeDatums(
|
|
tb.Meta().Name.O, // Table
|
|
0, // Non_unique
|
|
"PRIMARY", // Key_name
|
|
1, // Seq_in_index
|
|
pkCol.Name.O, // Column_name
|
|
"utf8_bin", // Colation
|
|
0, // Cardinality
|
|
nil, // Sub_part
|
|
nil, // Packed
|
|
"", // Null
|
|
"BTREE", // Index_type
|
|
"", // Comment
|
|
"", // Index_comment
|
|
)
|
|
e.rows = append(e.rows, &Row{Data: data})
|
|
}
|
|
for _, idx := range tb.Indices() {
|
|
for i, col := range idx.Meta().Columns {
|
|
nonUniq := 1
|
|
if idx.Meta().Unique {
|
|
nonUniq = 0
|
|
}
|
|
var subPart interface{}
|
|
if col.Length != types.UnspecifiedLength {
|
|
subPart = col.Length
|
|
}
|
|
data := types.MakeDatums(
|
|
tb.Meta().Name.O, // Table
|
|
nonUniq, // Non_unique
|
|
idx.Meta().Name.O, // Key_name
|
|
i+1, // Seq_in_index
|
|
col.Name.O, // Column_name
|
|
"utf8_bin", // Colation
|
|
0, // Cardinality
|
|
subPart, // Sub_part
|
|
nil, // Packed
|
|
"YES", // Null
|
|
idx.Meta().Tp.String(), // Index_type
|
|
"", // Comment
|
|
idx.Meta().Comment, // Index_comment
|
|
)
|
|
e.rows = append(e.rows, &Row{Data: data})
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// See http://dev.mysql.com/doc/refman/5.7/en/show-character-set.html
|
|
func (e *ShowExec) fetchShowCharset() error {
|
|
descs := charset.GetAllCharsets()
|
|
for _, desc := range descs {
|
|
row := &Row{
|
|
Data: types.MakeDatums(
|
|
desc.Name,
|
|
desc.Desc,
|
|
desc.DefaultCollation,
|
|
desc.Maxlen,
|
|
),
|
|
}
|
|
e.rows = append(e.rows, row)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (e *ShowExec) fetchShowVariables() error {
|
|
sessionVars := e.ctx.GetSessionVars()
|
|
for _, v := range variable.SysVars {
|
|
var err error
|
|
var value string
|
|
if !e.GlobalScope {
|
|
// Try to get Session Scope variable value first.
|
|
value, err = varsutil.GetSessionSystemVar(sessionVars, v.Name)
|
|
} else {
|
|
value, err = varsutil.GetGlobalSystemVar(sessionVars, v.Name)
|
|
}
|
|
if err != nil {
|
|
return errors.Trace(err)
|
|
}
|
|
row := &Row{Data: types.MakeDatums(v.Name, value)}
|
|
e.rows = append(e.rows, row)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (e *ShowExec) fetchShowStatus() error {
|
|
statusVars, err := variable.GetStatusVars()
|
|
if err != nil {
|
|
return errors.Trace(err)
|
|
}
|
|
for status, v := range statusVars {
|
|
if e.GlobalScope && v.Scope == variable.ScopeSession {
|
|
continue
|
|
}
|
|
switch v.Value.(type) {
|
|
case []interface{}, nil:
|
|
v.Value = fmt.Sprintf("%v", v.Value)
|
|
}
|
|
value, err := types.ToString(v.Value)
|
|
if err != nil {
|
|
return errors.Trace(err)
|
|
}
|
|
row := &Row{Data: types.MakeDatums(status, value)}
|
|
e.rows = append(e.rows, row)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (e *ShowExec) fetchShowCreateTable() error {
|
|
tb, err := e.getTable()
|
|
if err != nil {
|
|
return errors.Trace(err)
|
|
}
|
|
|
|
// TODO: let the result more like MySQL.
|
|
var buf bytes.Buffer
|
|
buf.WriteString(fmt.Sprintf("CREATE TABLE `%s` (\n", tb.Meta().Name.O))
|
|
var pkCol *table.Column
|
|
for i, col := range tb.Cols() {
|
|
buf.WriteString(fmt.Sprintf(" `%s` %s", col.Name.O, col.GetTypeDesc()))
|
|
if mysql.HasAutoIncrementFlag(col.Flag) {
|
|
buf.WriteString(" NOT NULL AUTO_INCREMENT")
|
|
} else {
|
|
if mysql.HasNotNullFlag(col.Flag) {
|
|
buf.WriteString(" NOT NULL")
|
|
}
|
|
if !mysql.HasNoDefaultValueFlag(col.Flag) {
|
|
switch col.DefaultValue {
|
|
case nil:
|
|
if !mysql.HasNotNullFlag(col.Flag) {
|
|
if mysql.HasTimestampFlag(col.Flag) {
|
|
buf.WriteString(" NULL")
|
|
}
|
|
buf.WriteString(" DEFAULT NULL")
|
|
}
|
|
case "CURRENT_TIMESTAMP":
|
|
buf.WriteString(" DEFAULT CURRENT_TIMESTAMP")
|
|
default:
|
|
buf.WriteString(fmt.Sprintf(" DEFAULT '%v'", col.DefaultValue))
|
|
}
|
|
}
|
|
if mysql.HasOnUpdateNowFlag(col.Flag) {
|
|
buf.WriteString(" ON UPDATE CURRENT_TIMESTAMP")
|
|
}
|
|
}
|
|
if len(col.Comment) > 0 {
|
|
buf.WriteString(fmt.Sprintf(" COMMENT '%s'", col.Comment))
|
|
}
|
|
if i != len(tb.Cols())-1 {
|
|
buf.WriteString(",\n")
|
|
}
|
|
if tb.Meta().PKIsHandle && mysql.HasPriKeyFlag(col.Flag) {
|
|
pkCol = col
|
|
}
|
|
}
|
|
|
|
if pkCol != nil {
|
|
// If PKIsHanle, pk info is not in tb.Indices(). We should handle it here.
|
|
buf.WriteString(",\n")
|
|
buf.WriteString(fmt.Sprintf(" PRIMARY KEY (`%s`)", pkCol.Name.O))
|
|
}
|
|
|
|
if len(tb.Indices()) > 0 || len(tb.Meta().ForeignKeys) > 0 {
|
|
buf.WriteString(",\n")
|
|
}
|
|
|
|
for i, idx := range tb.Indices() {
|
|
idxInfo := idx.Meta()
|
|
if idxInfo.Primary {
|
|
buf.WriteString(" PRIMARY KEY ")
|
|
} else if idxInfo.Unique {
|
|
buf.WriteString(fmt.Sprintf(" UNIQUE KEY `%s` ", idxInfo.Name.O))
|
|
} else {
|
|
buf.WriteString(fmt.Sprintf(" KEY `%s` ", idxInfo.Name.O))
|
|
}
|
|
|
|
cols := make([]string, 0, len(idxInfo.Columns))
|
|
for _, c := range idxInfo.Columns {
|
|
cols = append(cols, c.Name.O)
|
|
}
|
|
buf.WriteString(fmt.Sprintf("(`%s`)", strings.Join(cols, "`,`")))
|
|
if i != len(tb.Indices())-1 {
|
|
buf.WriteString(",\n")
|
|
}
|
|
}
|
|
|
|
if len(tb.Indices()) > 0 && len(tb.Meta().ForeignKeys) > 0 {
|
|
buf.WriteString(",\n")
|
|
}
|
|
|
|
firstFK := true
|
|
for _, fk := range tb.Meta().ForeignKeys {
|
|
if fk.State != model.StatePublic {
|
|
continue
|
|
}
|
|
if !firstFK {
|
|
buf.WriteString(",\n")
|
|
}
|
|
firstFK = false
|
|
cols := make([]string, 0, len(fk.Cols))
|
|
for _, c := range fk.Cols {
|
|
cols = append(cols, c.O)
|
|
}
|
|
|
|
refCols := make([]string, 0, len(fk.RefCols))
|
|
for _, c := range fk.Cols {
|
|
refCols = append(refCols, c.O)
|
|
}
|
|
|
|
buf.WriteString(fmt.Sprintf(" CONSTRAINT `%s` FOREIGN KEY (`%s`)", fk.Name.O, strings.Join(cols, "`,`")))
|
|
buf.WriteString(fmt.Sprintf(" REFERENCES `%s` (`%s`)", fk.RefTable.O, strings.Join(refCols, "`,`")))
|
|
|
|
if ast.ReferOptionType(fk.OnDelete) != ast.ReferOptionNoOption {
|
|
buf.WriteString(fmt.Sprintf(" ON DELETE %s", ast.ReferOptionType(fk.OnDelete)))
|
|
}
|
|
|
|
if ast.ReferOptionType(fk.OnUpdate) != ast.ReferOptionNoOption {
|
|
buf.WriteString(fmt.Sprintf(" ON UPDATE %s", ast.ReferOptionType(fk.OnUpdate)))
|
|
}
|
|
}
|
|
buf.WriteString("\n")
|
|
|
|
buf.WriteString(") ENGINE=InnoDB")
|
|
if s := tb.Meta().Charset; len(s) > 0 {
|
|
buf.WriteString(fmt.Sprintf(" DEFAULT CHARSET=%s", s))
|
|
}
|
|
|
|
if tb.Meta().AutoIncID > 0 {
|
|
buf.WriteString(fmt.Sprintf(" AUTO_INCREMENT=%d", tb.Meta().AutoIncID))
|
|
}
|
|
|
|
if len(tb.Meta().Comment) > 0 {
|
|
buf.WriteString(fmt.Sprintf(" COMMENT='%s'", tb.Meta().Comment))
|
|
}
|
|
|
|
data := types.MakeDatums(tb.Meta().Name.O, buf.String())
|
|
e.rows = append(e.rows, &Row{Data: data})
|
|
return nil
|
|
}
|
|
|
|
// Compose show create database result.
|
|
func (e *ShowExec) fetchShowCreateDatabase() error {
|
|
db, ok := e.is.SchemaByName(e.DBName)
|
|
if !ok {
|
|
return infoschema.ErrDatabaseNotExists.GenByArgs(e.DBName.O)
|
|
}
|
|
|
|
var buf bytes.Buffer
|
|
fmt.Fprintf(&buf, "CREATE DATABASE `%s`", db.Name.O)
|
|
if s := db.Charset; len(s) > 0 {
|
|
fmt.Fprintf(&buf, " /* !40100 DEFAULT CHARACTER SET %s */", s)
|
|
}
|
|
|
|
data := types.MakeDatums(db.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) fetchShowWarnings() error {
|
|
warns := e.ctx.GetSessionVars().StmtCtx.GetWarnings()
|
|
for _, warn := range warns {
|
|
datums := make([]types.Datum, 3)
|
|
datums[0] = types.NewStringDatum("Warning")
|
|
switch x := warn.(type) {
|
|
case *terror.Error:
|
|
sqlErr := x.ToSQLError()
|
|
datums[1] = types.NewIntDatum(int64(sqlErr.Code))
|
|
datums[2] = types.NewStringDatum(sqlErr.Message)
|
|
default:
|
|
datums[1] = types.NewIntDatum(int64(mysql.ErrUnknown))
|
|
datums[2] = types.NewStringDatum(warn.Error())
|
|
}
|
|
e.rows = append(e.rows, &Row{Data: datums})
|
|
}
|
|
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 the Executor Close interface.
|
|
func (e *ShowExec) Close() error {
|
|
return nil
|
|
}
|