b6a95a8cb3
* 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
144 lines
4.3 KiB
Go
144 lines
4.3 KiB
Go
// Copyright 2015 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 variable
|
|
|
|
import (
|
|
"github.com/pingcap/tidb/context"
|
|
)
|
|
|
|
// SessionVars is to handle user-defined or global variables in current session.
|
|
type SessionVars struct {
|
|
// user-defined variables
|
|
Users map[string]string
|
|
// system variables
|
|
Systems map[string]string
|
|
// prepared statement
|
|
PreparedStmts map[uint32]interface{}
|
|
|
|
PreparedStmtNameToID map[string]uint32
|
|
// prepared statement auto increment id
|
|
preparedStmtID uint32
|
|
|
|
// following variables are special for current session
|
|
Status uint16
|
|
LastInsertID uint64
|
|
AffectedRows uint64
|
|
|
|
// Client capability
|
|
ClientCapability uint32
|
|
|
|
// Connection ID
|
|
ConnectionID uint64
|
|
|
|
// Found rows
|
|
FoundRows uint64
|
|
|
|
// Current user
|
|
User string
|
|
}
|
|
|
|
// sessionVarsKeyType is a dummy type to avoid naming collision in context.
|
|
type sessionVarsKeyType int
|
|
|
|
// String defines a Stringer function for debugging and pretty printing.
|
|
func (k sessionVarsKeyType) String() string {
|
|
return "session_vars"
|
|
}
|
|
|
|
const sessionVarsKey sessionVarsKeyType = 0
|
|
|
|
// BindSessionVars creates a session vars object and binds it to context.
|
|
func BindSessionVars(ctx context.Context) {
|
|
v := &SessionVars{
|
|
Users: make(map[string]string),
|
|
Systems: make(map[string]string),
|
|
PreparedStmts: make(map[uint32]interface{}),
|
|
PreparedStmtNameToID: make(map[string]uint32),
|
|
}
|
|
|
|
ctx.SetValue(sessionVarsKey, v)
|
|
}
|
|
|
|
// GetSessionVars gets the session vars from context.
|
|
func GetSessionVars(ctx context.Context) *SessionVars {
|
|
v, ok := ctx.Value(sessionVarsKey).(*SessionVars)
|
|
if !ok {
|
|
return nil
|
|
}
|
|
return v
|
|
}
|
|
|
|
const (
|
|
characterSetConnection = "character_set_connection"
|
|
collationConnection = "collation_connection"
|
|
)
|
|
|
|
// GetCharsetInfo gets charset and collation for current context.
|
|
// What character set should the server translate a statement to after receiving it?
|
|
// For this, the server uses the character_set_connection and collation_connection system variables.
|
|
// It converts statements sent by the client from character_set_client to character_set_connection
|
|
// (except for string literals that have an introducer such as _latin1 or _utf8).
|
|
// collation_connection is important for comparisons of literal strings.
|
|
// For comparisons of strings with column values, collation_connection does not matter because columns
|
|
// have their own collation, which has a higher collation precedence.
|
|
// See: https://dev.mysql.com/doc/refman/5.7/en/charset-connection.html
|
|
func GetCharsetInfo(ctx context.Context) (charset, collation string) {
|
|
sessionVars := GetSessionVars(ctx)
|
|
charset = sessionVars.Systems[characterSetConnection]
|
|
collation = sessionVars.Systems[collationConnection]
|
|
return
|
|
}
|
|
|
|
// SetLastInsertID saves the last insert id to the session context.
|
|
// TODO: we may store the result for last_insert_id sys var later.
|
|
func (s *SessionVars) SetLastInsertID(insertID uint64) {
|
|
s.LastInsertID = insertID
|
|
}
|
|
|
|
// SetAffectedRows saves the affected rows to the session context.
|
|
func (s *SessionVars) SetAffectedRows(affectedRows uint64) {
|
|
s.AffectedRows = affectedRows
|
|
}
|
|
|
|
// AddAffectedRows adds affected rows with the argument rows.
|
|
func (s *SessionVars) AddAffectedRows(rows uint64) {
|
|
s.AffectedRows += rows
|
|
}
|
|
|
|
// AddFoundRows adds found rows with the argument rows.
|
|
func (s *SessionVars) AddFoundRows(rows uint64) {
|
|
s.FoundRows += rows
|
|
}
|
|
|
|
// SetStatusFlag sets the session server status variable.
|
|
// If on is ture sets the flag in session status,
|
|
// otherwise removes the flag.
|
|
func (s *SessionVars) SetStatusFlag(flag uint16, on bool) {
|
|
if on {
|
|
s.Status |= flag
|
|
return
|
|
}
|
|
s.Status &= (^flag)
|
|
}
|
|
|
|
// GetNextPreparedStmtID generates and returns the next session scope prepared statement id.
|
|
func (s *SessionVars) GetNextPreparedStmtID() uint32 {
|
|
s.preparedStmtID++
|
|
return s.preparedStmtID
|
|
}
|
|
|
|
// SetCurrentUser saves the current user to the session context.
|
|
func (s *SessionVars) SetCurrentUser(user string) {
|
|
s.User = user
|
|
}
|