0
0
Fork 0
mirror of https://github.com/go-gitea/gitea synced 2024-12-24 06:44:45 +01:00
gitea/vendor/github.com/pingcap/tidb/executor/show.go
Thomas Boerger b6a95a8cb3 Integrate public as bindata optionally (#293)
* Dropped unused codekit config

* Integrated dynamic and static bindata for public

* Ignore public bindata

* Add a general generate make task

* Integrated flexible public assets into web command

* Updated vendoring, added all missiong govendor deps

* Made the linter happy with the bindata and dynamic code

* Moved public bindata definition to modules directory

* Ignoring the new bindata path now

* Updated to the new public modules import path

* Updated public bindata command and drop the new prefix
2016-11-30 00:26:36 +08:00

461 lines
11 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"
"github.com/juju/errors"
"github.com/pingcap/tidb/ast"
"github.com/pingcap/tidb/column"
"github.com/pingcap/tidb/context"
"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/table"
"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
fields []*ast.ResultField
ctx context.Context
is infoschema.InfoSchema
fetched bool
rows []*Row
cursor int
}
// Fields implements Executor Fields interface.
func (e *ShowExec) Fields() []*ast.ResultField {
return e.fields
}
// 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]
for i, field := range e.fields {
field.Expr.SetValue(row.Data[i].GetValue())
}
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.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:
// 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) 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.L)
}
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
var tableNames []string
for _, v := range e.is.SchemaTables(e.DBName) {
tableNames = append(tableNames, v.Meta().Name.L)
}
sort.Strings(tableNames)
for _, v := range tableNames {
now := mysql.CurrentTime(mysql.TypeDatetime)
data := types.MakeDatums(v, "InnoDB", "10", "Compact", 100, 100, 100, 100, 100, 100, 100,
now, now, now, "utf8_general_ci", "", "", "")
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 := column.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)
}
for _, idx := range tb.Indices() {
for i, col := range idx.Columns {
nonUniq := 1
if idx.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.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.Tp.String(), // Index_type
"", // Comment
idx.Comment, // Index_comment
)
e.rows = append(e.rows, &Row{Data: data})
}
}
return nil
}
func (e *ShowExec) fetchShowCharset() error {
// See: http://dev.mysql.com/doc/refman/5.7/en/show-character-set.html
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 := variable.GetSessionVars(e.ctx)
globalVars := variable.GetGlobalVarAccessor(e.ctx)
for _, v := range variable.SysVars {
var err error
var value string
if !e.GlobalScope {
// Try to get Session Scope variable value first.
sv, ok := sessionVars.Systems[v.Name]
if ok {
value = sv
} else {
// If session scope variable is not set, get the global scope value.
value, err = globalVars.GetGlobalSysVar(e.ctx, v.Name)
if err != nil {
return errors.Trace(err)
}
}
} else {
value, err = globalVars.GetGlobalSysVar(e.ctx, 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
}
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))
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")
}
switch col.DefaultValue {
case nil:
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 i != len(tb.Cols())-1 {
buf.WriteString(",\n")
}
}
if len(tb.Indices()) > 0 {
buf.WriteString(",\n")
}
for i, idx := range tb.Indices() {
if idx.Primary {
buf.WriteString(" PRIMARY KEY ")
} else if idx.Unique {
buf.WriteString(fmt.Sprintf(" UNIQUE KEY `%s` ", idx.Name.O))
} else {
buf.WriteString(fmt.Sprintf(" KEY `%s` ", idx.Name.O))
}
cols := make([]string, 0, len(idx.Columns))
for _, c := range idx.Columns {
cols = append(cols, c.Name.O)
}
buf.WriteString(fmt.Sprintf("(`%s`)", strings.Join(cols, "`,`")))
if i != len(tb.Indices())-1 {
buf.WriteString(",\n")
}
}
buf.WriteString("\n")
buf.WriteString(") ENGINE=InnoDB")
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
}