variable

type GlobalVarAccessor interface {
	// GetGlobalSysVar gets the global system variable value for name.
	GetGlobalSysVar(name string) (string, error)
	// SetGlobalSysVar sets the global system variable name to value.
	SetGlobalSysVar(name string, value string) error
}

type RetryInfo struct {
	Retrying bool

	// Attempts is the current number of retry attempts.
	Attempts int
	// contains filtered or unexported fields
}

type ScopeFlag uint8

type SessionVars struct {
	// user-defined variables
	Users map[string]string

	// prepared statement
	PreparedStmts        map[uint32]interface{}
	PreparedStmtNameToID map[string]uint32

	// retry information
	RetryInfo *RetryInfo

	// 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

	// Current DB
	CurrentDB string

	// Strict SQL mode
	StrictSQLMode bool

	// CommonGlobalLoaded indicates if common global variable has been loaded for this session.
	CommonGlobalLoaded bool

	// InUpdateStmt indicates if the session is handling update stmt.
	InUpdateStmt bool

	// InRestrictedSQL indicates if the session is handling restricted SQL execution.
	InRestrictedSQL bool

	// SnapshotTS is used for reading history data. For simplicity, SnapshotTS only supports distsql request.
	SnapshotTS uint64

	// SnapshotInfoschema is used with SnapshotTS, when the schema version at snapshotTS less than current schema
	// version, we load an old version schema for query.
	SnapshotInfoschema interface{}

	// SkipConstraintCheck is true when importing data.
	SkipConstraintCheck bool

	// GlobalAccessor is used to set and get global variables.
	GlobalVarsAccessor GlobalVarAccessor
	// contains filtered or unexported fields
}

type Statistics interface {
	// GetScope gets the status variables scope.
	GetScope(status string) ScopeFlag
	// Stats returns the statistics status variables.
	Stats() (map[string]interface{}, error)
}

type StatusVal struct {
	Scope ScopeFlag
	Value interface{}
}

type SysVar struct {
	// Scope is for whether can be changed or not
	Scope ScopeFlag

	// Variable name
	Name string

	// Variable value
	Value string
}