session

package
v1.1.0-beta.0...-05cff08 Latest Latest
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 Go to latest Published: Sep 24, 2024 License: Apache-2.0 Imports: 135 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	// CreateUserTable is the SQL statement creates User table in system db.
	// WARNING: There are some limitations on altering the schema of mysql.user table.
	// Adding columns that are nullable or have default values is permitted.
	// But operations like dropping or renaming columns may break the compatibility with BR.
	// REFERENCE ISSUE: https://github.com/pingcap/tidb/issues/38785
	CreateUserTable = `` /* 2307-byte string literal not displayed */

	// CreateGlobalPrivTable is the SQL statement creates Global scope privilege table in system db.
	CreateGlobalPrivTable = "CREATE TABLE IF NOT EXISTS mysql.global_priv (" +
		"Host CHAR(255) NOT NULL DEFAULT ''," +
		"User CHAR(80) NOT NULL DEFAULT ''," +
		"Priv LONGTEXT NOT NULL DEFAULT ''," +
		"PRIMARY KEY (Host, User)" +
		")"

	// CreateDBPrivTable is the SQL statement creates DB scope privilege table in system db.
	CreateDBPrivTable = `` /* 1206-byte string literal not displayed */

	// CreateTablePrivTable is the SQL statement creates table scope privilege table in system db.
	CreateTablePrivTable = `` /* 528-byte string literal not displayed */

	// CreateColumnPrivTable is the SQL statement creates column scope privilege table in system db.
	CreateColumnPrivTable = `` /* 443-byte string literal not displayed */

	// CreateGlobalVariablesTable is the SQL statement creates global variable table in system db.
	// TODO: MySQL puts GLOBAL_VARIABLES table in INFORMATION_SCHEMA db.
	// INFORMATION_SCHEMA is a virtual db in TiDB. So we put this table in system db.
	// Maybe we will put it back to INFORMATION_SCHEMA.
	CreateGlobalVariablesTable = `` /* 148-byte string literal not displayed */

	// CreateTiDBTable is the SQL statement creates a table in system db.
	// This table is a key-value struct contains some information used by TiDB.
	// Currently we only put bootstrapped in it which indicates if the system is already bootstrapped.
	CreateTiDBTable = `` /* 164-byte string literal not displayed */

	// CreateHelpTopic is the SQL statement creates help_topic table in system db.
	// See: https://dev.mysql.com/doc/refman/5.5/en/system-database.html#system-database-help-tables
	CreateHelpTopic = `` /* 418-byte string literal not displayed */

	// CreateStatsMetaTable stores the meta of table statistics.
	CreateStatsMetaTable = `` /* 335-byte string literal not displayed */

	// CreateStatsColsTable stores the statistics of table columns.
	CreateStatsColsTable = `` /* 647-byte string literal not displayed */

	// CreateStatsBucketsTable stores the histogram info for every table columns.
	CreateStatsBucketsTable = `` /* 405-byte string literal not displayed */

	// CreateGCDeleteRangeTable stores schemas which can be deleted by DeleteRange.
	CreateGCDeleteRangeTable = `` /* 398-byte string literal not displayed */

	// CreateGCDeleteRangeDoneTable stores schemas which are already deleted by DeleteRange.
	CreateGCDeleteRangeDoneTable = `` /* 408-byte string literal not displayed */

	// CreateStatsFeedbackTable stores the feedback info which is used to update stats.
	// NOTE: Feedback is deprecated, but we still need to create this table for compatibility.
	CreateStatsFeedbackTable = `` /* 220-byte string literal not displayed */

	// CreateBindInfoTable stores the sql bind info which is used to update globalBindCache.
	CreateBindInfoTable = `` /* 655-byte string literal not displayed */

	// CreateRoleEdgesTable stores the role and user relationship information.
	CreateRoleEdgesTable = `` /* 445-byte string literal not displayed */

	// CreateDefaultRolesTable stores the active roles for a user.
	CreateDefaultRolesTable = `` /* 366-byte string literal not displayed */

	// CreateStatsTopNTable stores topn data of a cmsketch with top n.
	CreateStatsTopNTable = `` /* 249-byte string literal not displayed */

	// CreateStatsFMSketchTable stores FMSketch data of a column histogram.
	CreateStatsFMSketchTable = `` /* 213-byte string literal not displayed */

	// CreateExprPushdownBlacklist stores the expressions which are not allowed to be pushed down.
	CreateExprPushdownBlacklist = `` /* 177-byte string literal not displayed */

	// CreateOptRuleBlacklist stores the list of disabled optimizing operations.
	CreateOptRuleBlacklist = `CREATE TABLE IF NOT EXISTS mysql.opt_rule_blacklist (
		name 	CHAR(100) NOT NULL
	);`

	// CreateStatsExtended stores the registered extended statistics.
	CreateStatsExtended = `` /* 376-byte string literal not displayed */

	// CreateSchemaIndexUsageTable stores the index usage information.
	CreateSchemaIndexUsageTable = `` /* 217-byte string literal not displayed */

	// CreateGlobalGrantsTable stores dynamic privs
	CreateGlobalGrantsTable = `` /* 251-byte string literal not displayed */

	// CreateCapturePlanBaselinesBlacklist stores the baseline capture filter rules.
	CreateCapturePlanBaselinesBlacklist = `` /* 291-byte string literal not displayed */

	// CreateColumnStatsUsageTable stores the column stats usage information.
	CreateColumnStatsUsageTable = `` /* 224-byte string literal not displayed */

	// CreateTableCacheMetaTable stores the cached table meta lock information.
	CreateTableCacheMetaTable = `` /* 273-byte string literal not displayed */

	// CreateAnalyzeOptionsTable stores the analyze options used by analyze and auto analyze.
	CreateAnalyzeOptionsTable = `` /* 398-byte string literal not displayed */

	// CreateStatsHistory stores the historical stats.
	CreateStatsHistory = `` /* 493-byte string literal not displayed */

	// CreateStatsMetaHistory stores the historical meta stats.
	CreateStatsMetaHistory = `` /* 463-byte string literal not displayed */

	// CreateAnalyzeJobs stores the analyze jobs.
	CreateAnalyzeJobs = `` /* 767-byte string literal not displayed */

	// CreateAdvisoryLocks stores the advisory locks (get_lock, release_lock).
	CreateAdvisoryLocks = `CREATE TABLE IF NOT EXISTS mysql.advisory_locks (
		lock_name VARCHAR(64) NOT NULL PRIMARY KEY
	);`
	// CreateMDLView is a view about metadata locks.
	CreateMDLView = `` /* 774-byte string literal not displayed */

	// CreatePlanReplayerStatusTable is a table about plan replayer status
	CreatePlanReplayerStatusTable = `` /* 365-byte string literal not displayed */

	// CreatePlanReplayerTaskTable is a table about plan replayer capture task
	CreatePlanReplayerTaskTable = `` /* 255-byte string literal not displayed */

	// CreateStatsTableLocked stores the locked tables
	CreateStatsTableLocked = `` /* 246-byte string literal not displayed */

	// CreatePasswordHistory is a table save history passwd.
	CreatePasswordHistory = `` /* 356-byte string literal not displayed */

	// CreateTTLTableStatus is a table about TTL job schedule
	CreateTTLTableStatus = `` /* 851-byte string literal not displayed */

	// CreateTTLTask is a table about parallel ttl tasks
	CreateTTLTask = `` /* 526-byte string literal not displayed */

	// CreateTTLJobHistory is a table that stores ttl job's history
	CreateTTLJobHistory = `` /* 695-byte string literal not displayed */

	// CreateGlobalTask is a table about global task.
	CreateGlobalTask = `` /* 524-byte string literal not displayed */

	// CreateGlobalTaskHistory is a table about history global task.
	CreateGlobalTaskHistory = `` /* 532-byte string literal not displayed */

	// CreateDistFrameworkMeta create a system table that distributed task framework use to store meta information
	CreateDistFrameworkMeta = `` /* 218-byte string literal not displayed */

	// CreateRunawayTable stores the query which is identified as runaway or quarantined because of in watch list.
	CreateRunawayTable = `` /* 632-byte string literal not displayed */

	// CreateRunawayWatchTable stores the condition which is used to check whether query should be quarantined.
	CreateRunawayWatchTable = `` /* 666-byte string literal not displayed */

	// CreateDoneRunawayWatchTable stores the condition which is used to check whether query should be quarantined.
	CreateDoneRunawayWatchTable = `` /* 529-byte string literal not displayed */

	// CreateRequestUnitByGroupTable stores the historical RU consumption by resource group.
	CreateRequestUnitByGroupTable = `` /* 287-byte string literal not displayed */

	// CreateImportJobs is a table that IMPORT INTO uses.
	CreateImportJobs = `` /* 681-byte string literal not displayed */

	// CreatePITRIDMap is a table that records the id map from upstream to downstream for PITR.
	CreatePITRIDMap = `` /* 297-byte string literal not displayed */

	// DropMySQLIndexUsageTable removes the table `mysql.schema_index_usage`
	DropMySQLIndexUsageTable = "DROP TABLE IF EXISTS mysql.schema_index_usage"

	// CreateSysSchema creates a new schema called `sys`.
	CreateSysSchema = `CREATE DATABASE IF NOT EXISTS sys;`

	// CreateSchemaUnusedIndexesView creates a view to use `information_schema.tidb_index_usage` to get the unused indexes.
	CreateSchemaUnusedIndexesView = `` /* 403-byte string literal not displayed */

	// CreateIndexAdvisorTable is a table to store the index advisor results.
	CreateIndexAdvisorTable = `` /* 901-byte string literal not displayed */

	// CreateKernelOptionsTable is a table to store kernel options for tidb.
	CreateKernelOptionsTable = `` /* 257-byte string literal not displayed */

)
View Source 
const (

	// MockSimpleUpgradeToVerLatest is used to indicate the use of the simple mock bootstrapVersion, this is just a few simple DDL operations.
	MockSimpleUpgradeToVerLatest = 1
)
View Source 
const (

	// TidbNewCollationEnabled The variable name in mysql.tidb table and it will indicate if the new collations are enabled in the TiDB cluster.
	TidbNewCollationEnabled = "new_collation_enabled"
)

Variables

View Source 
var (

	// DDLJobTables is a list of tables definitions used in concurrent DDL.
	DDLJobTables = []tableBasicInfo{
		{ddl.JobTableSQL, ddl.JobTableID},
		{ddl.ReorgTableSQL, ddl.ReorgTableID},
		{ddl.HistoryTableSQL, ddl.HistoryTableID},
	}
	// BackfillTables is a list of tables definitions used in dist reorg DDL.
	BackfillTables = []tableBasicInfo{
		{ddl.BackgroundSubtaskTableSQL, ddl.BackgroundSubtaskTableID},
		{ddl.BackgroundSubtaskHistoryTableSQL, ddl.BackgroundSubtaskHistoryTableID},
	}
)
View Source 
var (
	// GetBootstrapVersion is used in test
	GetBootstrapVersion = getBootstrapVersion
	// CurrentBootstrapVersion is used in test
	CurrentBootstrapVersion = currentBootstrapVersion
	// UnsetStoreBootstrapped is used in test
	UnsetStoreBootstrapped = unsetStoreBootstrapped
)
View Source 
var CreateTimers = timertable.CreateTimerTableSQL("mysql", "tidb_timers")

CreateTimers is a table to store all timers for tidb

View Source 
var (
	ErrForUpdateCantRetry = dbterror.ClassSession.NewStd(errno.ErrForUpdateCantRetry)
)

Session errors.

View Source 
var ErrNonTransactionalJobFailure = dbterror.ClassSession.NewStd(errno.ErrNonTransactionalJobFailure)

ErrNonTransactionalJobFailure is the error when a non-transactional job fails. The error is returned and following jobs are canceled.

View Source 
var MockUpgradeToVerLatestKind = defaultMockUpgradeToVerLatest

MockUpgradeToVerLatestKind is used to indicate the use of different mock bootstrapVersion.

View Source 
var SchemaChangedWithoutRetry uint32

SchemaChangedWithoutRetry is used for testing.

View Source 
var (
	// SupportUpgradeHTTPOpVer is exported for testing.
	// The minimum version of the upgrade by paused user DDL can be notified through the HTTP API.
	SupportUpgradeHTTPOpVer int64 = version174
)
View Source 
var TestHook = TestCallback{}

TestHook is exported for testing.

View Source 
var WithMockUpgrade *bool

WithMockUpgrade is a flag identify whether tests run with mock upgrading.

Functions

func BootstrapSession 

func BootstrapSession(store kv.Storage) (*domain.Domain, error)

BootstrapSession bootstrap session and domain.

func BootstrapSession4DistExecution 

func BootstrapSession4DistExecution(store kv.Storage) (*domain.Domain, error)

BootstrapSession4DistExecution bootstrap session and dom for Distributed execution test, only for unit testing.

func CreateSession 

func CreateSession(store kv.Storage) (types.Session, error)

CreateSession creates a new session environment.

func CreateSession4Test 

func CreateSession4Test(store kv.Storage) (types.Session, error)

CreateSession4Test creates a new session environment for test.

func CreateSession4TestWithOpt 

func CreateSession4TestWithOpt(store kv.Storage, opt *Opt) (types.Session, error)

CreateSession4TestWithOpt creates a new session environment for test.

func CreateSessionAndSetID 

func CreateSessionAndSetID(t *testing.T, store kv.Storage) sessiontypes.Session

CreateSessionAndSetID creates a session and set connection ID.

func CreateSessionWithDomain 

func CreateSessionWithDomain(store kv.Storage, dom *domain.Domain) (*session, error)

CreateSessionWithDomain creates a new Session and binds it with a Domain. We need this because when we start DDL in Domain, the DDL need a session to change some system tables. But at that time, we have been already in a lock context, which cause we can't call createSession directly.

func CreateSessionWithOpt 

func CreateSessionWithOpt(store kv.Storage, opt *Opt) (types.Session, error)

CreateSessionWithOpt creates a new session environment with option. Use default option if opt is nil.

func CreateStoreAndBootstrap 

func CreateStoreAndBootstrap(t *testing.T) (kv.Storage, *domain.Domain)

CreateStoreAndBootstrap creates a mock store and bootstrap it.

func DisableRunBootstrapSQLFileInTest 

func DisableRunBootstrapSQLFileInTest()

DisableRunBootstrapSQLFileInTest only used for test

func DisableStats4Test 

func DisableStats4Test()

DisableStats4Test disables the stats for tests.

func ExecRestrictedStmt4Test 

func ExecRestrictedStmt4Test(ctx context.Context, s types.Session,
	stmtNode ast.StmtNode, opts ...sqlexec.OptionFuncAlias) (
	[]chunk.Row, []*resolve.ResultField, error)

ExecRestrictedStmt4Test wrapper `(s *session) ExecRestrictedStmt` for test.

func GetDBNames 

func GetDBNames(seVar *variable.SessionVars) []string

GetDBNames gets the sql layer database names from the session.

func GetDomain 

func GetDomain(store kv.Storage) (*domain.Domain, error)

GetDomain gets the associated domain for store.

func GetPlanReplayerGCLease 

func GetPlanReplayerGCLease() time.Duration

GetPlanReplayerGCLease returns the plan replayer gc lease time.

func GetRows4Test 

func GetRows4Test(ctx context.Context, _ sessionctx.Context, rs sqlexec.RecordSet) ([]chunk.Row, error)

GetRows4Test gets all the rows from a RecordSet, only used for test.

func GetStartTSFromSession 

func GetStartTSFromSession(se any) (startTS, processInfoID uint64)

GetStartTSFromSession returns the startTS in the session `se`

func HandleNonTransactionalDML 

func HandleNonTransactionalDML(ctx context.Context, stmt *ast.NonTransactionalDMLStmt, se sessiontypes.Session) (sqlexec.RecordSet, error)

HandleNonTransactionalDML is the entry point for a non-transactional DML statement

func InitDDLJobTables 

func InitDDLJobTables(store kv.Storage, targetVer meta.DDLTableVersion) error

InitDDLJobTables is to create tidb_ddl_job, tidb_ddl_reorg and tidb_ddl_history, or tidb_background_subtask and tidb_background_subtask_history.

func InitMDLTable 

func InitMDLTable(store kv.Storage) error

InitMDLTable is to create tidb_mdl_info, which is used for metadata lock.

func InitMDLVariable 

func InitMDLVariable(store kv.Storage) error

InitMDLVariable initializes the metadata lock variable.

func InitMDLVariableForBootstrap 

func InitMDLVariableForBootstrap(store kv.Storage) error

InitMDLVariableForBootstrap initializes the metadata lock variable.

func InitMDLVariableForUpgrade 

func InitMDLVariableForUpgrade(store kv.Storage) (bool, error)

InitMDLVariableForUpgrade initializes the metadata lock variable.

func InitTiDBSchemaCacheSize 

func InitTiDBSchemaCacheSize(store kv.Storage) error

InitTiDBSchemaCacheSize initializes the tidb schema cache size.

func IsUpgradingClusterState 

func IsUpgradingClusterState(s sessionctx.Context) (bool, error)

IsUpgradingClusterState checks whether the global state is upgrading.

func KeyNeedToLock 

func KeyNeedToLock(k, v []byte, flags kv.KeyFlags) bool

KeyNeedToLock returns true if the key need to lock.

func MustExec 

func MustExec(t *testing.T, se sessiontypes.Session, sql string, args ...any)

MustExec executes a sql statement and asserts no error occurs.

func MustExecToRecodeSet 

func MustExecToRecodeSet(t *testing.T, se sessiontypes.Session, sql string, args ...any) sqlexec.RecordSet

MustExecToRecodeSet executes a sql statement and asserts no error occurs.

func Parse 

func Parse(ctx sessionctx.Context, src string) ([]ast.StmtNode, error)

Parse parses a query string to raw ast.StmtNode.

func ParseWithParams4Test 

func ParseWithParams4Test(ctx context.Context, s types.Session,
	sql string, args ...any) (ast.StmtNode, error)

ParseWithParams4Test wrapper (s *session) ParseWithParams for test

func RegisterMockUpgradeFlag 

func RegisterMockUpgradeFlag(fSet *flag.FlagSet)

RegisterMockUpgradeFlag registers the mock upgrade flag.

func RemoveLockDDLJobs 

func RemoveLockDDLJobs(s types.Session, job2ver map[int64]int64, job2ids map[int64]string, printLog bool)

RemoveLockDDLJobs removes the DDL jobs which doesn't get the metadata lock from job2ver.

func ResetMockAutoRandIDRetryCount 

func ResetMockAutoRandIDRetryCount(failTimes int64)

ResetMockAutoRandIDRetryCount set the number of occurrences of `kv.ErrTxnRetryable` when calling TxnState.Commit().

func ResetStoreForWithTiKVTest 

func ResetStoreForWithTiKVTest(store kv.Storage)

ResetStoreForWithTiKVTest is only used in the test code. TODO: Remove domap and storeBootstrapped. Use store.SetOption() to do it.

func ResultSetToStringSlice 

func ResultSetToStringSlice(ctx context.Context, s types.Session, rs sqlexec.RecordSet) ([][]string, error)

ResultSetToStringSlice changes the RecordSet to [][]string.

func SetPlanReplayerGCLease 

func SetPlanReplayerGCLease(lease time.Duration)

SetPlanReplayerGCLease changes the default plan repalyer gc lease time.

func SetSchemaLease 

func SetSchemaLease(lease time.Duration)

SetSchemaLease changes the default schema lease time for DDL. This function is very dangerous, don't use it if you really know what you do. SetSchemaLease only affects not local storage after bootstrapped.

func SetStatsLease 

func SetStatsLease(lease time.Duration)

SetStatsLease changes the default stats lease time for loading stats info.

func SyncNormalRunning 

func SyncNormalRunning(s sessionctx.Context) error

SyncNormalRunning syncs normal state to etcd.

func SyncUpgradeState 

func SyncUpgradeState(s sessionctx.Context, timeout time.Duration) error

SyncUpgradeState syncs upgrade state to etcd.

Types

type BaseCallback 

type BaseCallback struct{}

BaseCallback implements Callback interfaces.

func (*BaseCallback) OnBootstrap 

func (*BaseCallback) OnBootstrap(types.Session)

OnBootstrap implements Callback interface.

func (*BaseCallback) OnBootstrapAfter 

func (*BaseCallback) OnBootstrapAfter(types.Session)

OnBootstrapAfter implements Callback interface.

func (*BaseCallback) OnBootstrapBefore 

func (*BaseCallback) OnBootstrapBefore(types.Session)

OnBootstrapBefore implements Callback interface.

type Callback 

type Callback interface {
	// OnBootstrapBefore is called before doing bootstrap.
	OnBootstrapBefore(s types.Session)
	// OnBootstrap is called doing bootstrap.
	OnBootstrap(s types.Session)
	// OnBootstrapAfter is called after doing bootstrap.
	OnBootstrapAfter(s types.Session)
}

Callback is used for Test.

type ExecStmtVarKeyType 

type ExecStmtVarKeyType int

ExecStmtVarKeyType is a dummy type to avoid naming collision in context. 

const ExecStmtVarKey ExecStmtVarKeyType = 0

ExecStmtVarKey is a variable key for ExecStmt.

func (ExecStmtVarKeyType) String 

func (ExecStmtVarKeyType) String() string

String defines a Stringer function for debugging and pretty printing.

type LazyTxn 

type LazyTxn struct {
	// States of a LazyTxn should be one of the followings:
	// Invalid: kv.Transaction == nil && txnFuture == nil
	// Pending: kv.Transaction == nil && txnFuture != nil
	// Valid:	kv.Transaction != nil && txnFuture == nil
	kv.Transaction
	// contains filtered or unexported fields
}

LazyTxn wraps kv.Transaction to provide a new kv.Transaction. 1. It holds all statement related modification in the buffer before flush to the txn, so if execute statement meets error, the txn won't be made dirty. 2. It's a lazy transaction, that means it's a txnFuture before StartTS() is really need.

func (*LazyTxn) CacheTableInfo 

func (txn *LazyTxn) CacheTableInfo(id int64, info *model.TableInfo)

CacheTableInfo caches the index name.

func (*LazyTxn) CancelFairLocking 

func (txn *LazyTxn) CancelFairLocking(ctx context.Context) error

CancelFairLocking wraps the inner transaction to support using fair locking with lazy initialization.

func (*LazyTxn) Commit 

func (txn *LazyTxn) Commit(ctx context.Context) error

Commit overrides the Transaction interface.

func (*LazyTxn) DoneFairLocking 

func (txn *LazyTxn) DoneFairLocking(ctx context.Context) error

DoneFairLocking wraps the inner transaction to support using fair locking with lazy initialization.

func (*LazyTxn) GetOption 

func (txn *LazyTxn) GetOption(opt int) any

GetOption implements the GetOption

func (*LazyTxn) GetTableInfo 

func (txn *LazyTxn) GetTableInfo(id int64) *model.TableInfo

GetTableInfo returns the cached index name.

func (*LazyTxn) GoString 

func (txn *LazyTxn) GoString() string

GoString implements the "%#v" format for fmt.Printf.

func (*LazyTxn) IsInFairLockingMode 

func (txn *LazyTxn) IsInFairLockingMode() bool

IsInFairLockingMode wraps the inner transaction to support using fair locking with lazy initialization.

func (*LazyTxn) KeysNeedToLock 

func (txn *LazyTxn) KeysNeedToLock() ([]kv.Key, error)

KeysNeedToLock returns the keys need to be locked.

func (*LazyTxn) LockKeys 

func (txn *LazyTxn) LockKeys(ctx context.Context, lockCtx *kv.LockCtx, keys ...kv.Key) error

LockKeys wraps the inner transaction's `LockKeys` to record the status

func (*LazyTxn) LockKeysFunc 

func (txn *LazyTxn) LockKeysFunc(ctx context.Context, lockCtx *kv.LockCtx, fn func(), keys ...kv.Key) error

LockKeysFunc Wrap the inner transaction's `LockKeys` to record the status

func (*LazyTxn) Mem 

func (txn *LazyTxn) Mem() uint64

Mem implements the MemBuffer interface.

func (*LazyTxn) MemHookSet 

func (txn *LazyTxn) MemHookSet() bool

MemHookSet returns whether the memory footprint change hook is set.

func (*LazyTxn) RetryFairLocking 

func (txn *LazyTxn) RetryFairLocking(ctx context.Context) error

RetryFairLocking wraps the inner transaction to support using fair locking with lazy initialization.

func (*LazyTxn) Rollback 

func (txn *LazyTxn) Rollback() error

Rollback overrides the Transaction interface.

func (*LazyTxn) RollbackMemDBToCheckpoint 

func (txn *LazyTxn) RollbackMemDBToCheckpoint(savepoint *tikv.MemDBCheckpoint)

RollbackMemDBToCheckpoint overrides the Transaction interface.

func (*LazyTxn) SetMemoryFootprintChangeHook 

func (txn *LazyTxn) SetMemoryFootprintChangeHook(hook func(uint64))

SetMemoryFootprintChangeHook sets the hook to be called when the memory footprint of this transaction changes.

func (*LazyTxn) Size 

func (txn *LazyTxn) Size() int

Size implements the MemBuffer interface.

func (*LazyTxn) StartFairLocking 

func (txn *LazyTxn) StartFairLocking() error

StartFairLocking wraps the inner transaction to support using fair locking with lazy initialization.

func (*LazyTxn) String 

func (txn *LazyTxn) String() string

func (*LazyTxn) Valid 

func (txn *LazyTxn) Valid() bool

Valid implements the kv.Transaction interface.

func (*LazyTxn) Wait 

func (txn *LazyTxn) Wait(ctx context.Context, sctx sessionctx.Context) (kv.Transaction, error)

Wait converts pending txn to valid

type Opt 

type Opt struct {
	PreparedPlanCache sessionctx.SessionPlanCache
}

Opt describes the option for creating session

type StmtHistory 

type StmtHistory struct {
	// contains filtered or unexported fields
}

StmtHistory holds all histories of statements in a txn.

func GetHistory 

func GetHistory(ctx sessionctx.Context) *StmtHistory

GetHistory get all stmtHistory in current txn. Exported only for test. If stmtHistory is nil, will create a new one for current txn.

func (*StmtHistory) Add 

func (h *StmtHistory) Add(st sqlexec.Statement, stmtCtx *stmtctx.StatementContext)

Add appends a stmt to history list.

func (*StmtHistory) Count 

func (h *StmtHistory) Count() int

Count returns the count of the history.

type TestCallback 

type TestCallback struct {
	*BaseCallback

	Cnt                       *atomicutil.Int32
	OnBootstrapBeforeExported func(s types.Session)
	OnBootstrapExported       func(s types.Session)
	OnBootstrapAfterExported  func(s types.Session)
}

TestCallback is used to customize user callback themselves.

func (*TestCallback) OnBootstrap 

func (tc *TestCallback) OnBootstrap(s types.Session)

OnBootstrap mocks the same behavior with the main bootstrap hook.

func (*TestCallback) OnBootstrapAfter 

func (tc *TestCallback) OnBootstrapAfter(s types.Session)

OnBootstrapAfter mocks the same behavior with the main bootstrap hook.

func (*TestCallback) OnBootstrapBefore 

func (tc *TestCallback) OnBootstrapBefore(s types.Session)

OnBootstrapBefore mocks the same behavior with the main bootstrap hook.

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