Golang driver.Timestamp函数代码示例

// ExecuteStatements executes the given statement(s) and returns a response.
// On error, the returned integer is an HTTP error code.
func (e *Executor) ExecuteStatements(user string, session Session, stmts string, params []parser.Datum) (Response, int, error) {
	planMaker := plannerPool.Get().(*planner)
	defer plannerPool.Put(planMaker)

	*planMaker = planner{
		user: user,
		evalCtx: parser.EvalContext{
			NodeID:  e.nodeID,
			ReCache: e.reCache,
			// Copy existing GetLocation closure. See plannerPool.New() for the
			// initial setting.
			GetLocation: planMaker.evalCtx.GetLocation,
		},
		leaseMgr:     e.leaseMgr,
		systemConfig: e.getSystemConfig(),
		session:      session,
	}

	// Resume a pending transaction if present.
	if planMaker.session.Txn != nil {
		txn := client.NewTxn(e.db)
		txn.Proto = planMaker.session.Txn.Txn
		txn.UserPriority = planMaker.session.Txn.UserPriority
		if planMaker.session.MutatesSystemConfig {
			txn.SetSystemConfigTrigger()
		}
		planMaker.setTxn(txn, planMaker.session.Txn.Timestamp.GoTime())
	}

	// Send the Request for SQL execution and set the application-level error
	// for each result in the reply.
	planMaker.params = parameters(params)
	reply := e.execStmts(stmts, planMaker)

	// Send back the session state even if there were application-level errors.
	// Add transaction to session state.
	if planMaker.txn != nil {
		// TODO(pmattis): Need to record the leases used by a transaction within
		// the transaction state and restore it when the transaction is restored.
		planMaker.releaseLeases(e.db)
		planMaker.session.Txn = &Session_Transaction{
			Txn:          planMaker.txn.Proto,
			Timestamp:    driver.Timestamp(planMaker.evalCtx.TxnTimestamp.Time),
			UserPriority: planMaker.txn.UserPriority,
		}
		planMaker.session.MutatesSystemConfig = planMaker.txn.SystemConfigTrigger()
	} else {
		planMaker.session.Txn = nil
		planMaker.session.MutatesSystemConfig = false
	}
	bytes, err := proto.Marshal(&planMaker.session)
	if err != nil {
		return Response{}, http.StatusInternalServerError, err
	}
	reply.Session = bytes

	return reply, 0, nil
}

// Execute the statement(s) in the given request and return a response.
// On error, the returned integer is an HTTP error code.
func (e *Executor) Execute(args driver.Request) (driver.Response, int, error) {
	planMaker := plannerPool.Get().(*planner)
	defer plannerPool.Put(planMaker)

	*planMaker = planner{
		user: args.GetUser(),
		evalCtx: parser.EvalContext{
			NodeID:  e.nodeID,
			ReCache: e.reCache,
			// Copy existing GetLocation closure. See plannerPool.New() for the
			// initial setting.
			GetLocation: planMaker.evalCtx.GetLocation,
		},
		leaseMgr:     e.leaseMgr,
		systemConfig: e.getSystemConfig(),
	}

	// Pick up current session state.
	if err := proto.Unmarshal(args.Session, &planMaker.session); err != nil {
		return args.CreateReply(), http.StatusBadRequest, err
	}
	// Resume a pending transaction if present.
	if planMaker.session.Txn != nil {
		txn := client.NewTxn(e.db)
		txn.Proto = planMaker.session.Txn.Txn
		if planMaker.session.MutatesSystemDB {
			txn.SetSystemDBTrigger()
		}
		planMaker.setTxn(txn, planMaker.session.Txn.Timestamp.GoTime())
	}

	// Send the Request for SQL execution and set the application-level error
	// for each result in the reply.
	planMaker.params = parameters(args.Params)
	reply := e.execStmts(args.Sql, planMaker)

	// Send back the session state even if there were application-level errors.
	// Add transaction to session state.
	if planMaker.txn != nil {
		planMaker.session.Txn = &Session_Transaction{Txn: planMaker.txn.Proto, Timestamp: driver.Timestamp(planMaker.evalCtx.TxnTimestamp.Time)}
		planMaker.session.MutatesSystemDB = planMaker.txn.SystemDBTrigger()
	} else {
		planMaker.session.Txn = nil
		planMaker.session.MutatesSystemDB = false
	}
	bytes, err := proto.Marshal(&planMaker.session)
	if err != nil {
		return args.CreateReply(), http.StatusInternalServerError, err
	}
	reply.Session = bytes

	return reply, 0, nil
}

func protoFromDatum(datum parser.Datum) driver.Datum {
	if datum == parser.DNull {
		return driver.Datum{}
	}

	switch vt := datum.(type) {
	case parser.DBool:
		return driver.Datum{
			Payload: &driver.Datum_BoolVal{BoolVal: bool(vt)},
		}
	case parser.DInt:
		return driver.Datum{
			Payload: &driver.Datum_IntVal{IntVal: int64(vt)},
		}
	case parser.DFloat:
		return driver.Datum{
			Payload: &driver.Datum_FloatVal{FloatVal: float64(vt)},
		}
	case *parser.DDecimal:
		return driver.Datum{
			Payload: &driver.Datum_DecimalVal{DecimalVal: vt.Dec.String()},
		}
	case parser.DBytes:
		return driver.Datum{
			Payload: &driver.Datum_BytesVal{BytesVal: []byte(vt)},
		}
	case parser.DString:
		return driver.Datum{
			Payload: &driver.Datum_StringVal{StringVal: string(vt)},
		}
	case parser.DDate:
		return driver.Datum{
			Payload: &driver.Datum_DateVal{DateVal: int64(vt)},
		}
	case parser.DTimestamp:
		wireTimestamp := driver.Timestamp(vt.Time)
		return driver.Datum{
			Payload: &driver.Datum_TimeVal{
				TimeVal: &wireTimestamp,
			},
		}
	case parser.DInterval:
		return driver.Datum{
			Payload: &driver.Datum_IntervalVal{IntervalVal: vt.Nanoseconds()},
		}
	default:
		panic(util.Errorf("unsupported result type: %s", datum.Type()))
	}
}

func makeDriverDatum(datum parser.Datum) (driver.Datum, error) {
	if datum == parser.DNull {
		return driver.Datum{}, nil
	}

	switch vt := datum.(type) {
	case parser.DBool:
		return driver.Datum{
			Payload: &driver.Datum_BoolVal{BoolVal: bool(vt)},
		}, nil
	case parser.DInt:
		return driver.Datum{
			Payload: &driver.Datum_IntVal{IntVal: int64(vt)},
		}, nil
	case parser.DFloat:
		return driver.Datum{
			Payload: &driver.Datum_FloatVal{FloatVal: float64(vt)},
		}, nil
	case parser.DBytes:
		return driver.Datum{
			Payload: &driver.Datum_BytesVal{BytesVal: []byte(vt)},
		}, nil
	case parser.DString:
		return driver.Datum{
			Payload: &driver.Datum_StringVal{StringVal: string(vt)},
		}, nil
	case parser.DDate:
		return driver.Datum{
			Payload: &driver.Datum_DateVal{DateVal: int64(vt)},
		}, nil
	case parser.DTimestamp:
		wireTimestamp := driver.Timestamp(vt.Time)
		return driver.Datum{
			Payload: &driver.Datum_TimeVal{
				TimeVal: &wireTimestamp,
			},
		}, nil
	case parser.DInterval:
		return driver.Datum{
			Payload: &driver.Datum_IntervalVal{IntervalVal: vt.Nanoseconds()},
		}, nil
	default:
		return driver.Datum{}, fmt.Errorf("unsupported result type: %s", datum.Type())
	}
}

func (e *Executor) execStmt(stmt parser.Statement, params parameters, planMaker *planner) (driver.Response_Result, error) {
	var result driver.Response_Result
	switch stmt.(type) {
	case *parser.BeginTransaction:
		if planMaker.txn != nil {
			return result, errTransactionInProgress
		}
		// Start a transaction here and not in planMaker to prevent begin
		// transaction from being called within an auto-transaction below.
		planMaker.setTxn(client.NewTxn(e.db), time.Now())
		planMaker.txn.SetDebugName("sql", 0)
	case *parser.CommitTransaction, *parser.RollbackTransaction:
		if planMaker.txn == nil {
			return result, errNoTransactionInProgress
		} else if planMaker.txn.Proto.Status == roachpb.ABORTED {
			// Reset to allow starting a new transaction.
			planMaker.resetTxn()
			return result, nil
		}
	case *parser.SetTransaction:
		if planMaker.txn == nil {
			return result, errNoTransactionInProgress
		}
	default:
		if planMaker.txn != nil && planMaker.txn.Proto.Status == roachpb.ABORTED {
			return result, errTransactionAborted
		}
	}

	// Bind all the placeholder variables in the stmt to actual values.
	if err := parser.FillArgs(stmt, params); err != nil {
		return result, err
	}

	// Create a function which both makes and executes the plan, populating
	// result.
	//
	// TODO(pmattis): Should this be a separate function? Perhaps we should move
	// some of the common code back out into execStmts and have execStmt contain
	// only the body of this closure.
	f := func(timestamp time.Time) error {
		planMaker.evalCtx.StmtTimestamp = parser.DTimestamp{Time: timestamp}
		plan, err := planMaker.makePlan(stmt)
		if err != nil {
			return err
		}

		switch stmt.StatementType() {
		case parser.DDL:
			result.Union = &driver.Response_Result_DDL_{DDL: &driver.Response_Result_DDL{}}
		case parser.RowsAffected:
			resultRowsAffected := driver.Response_Result_RowsAffected{}
			result.Union = &resultRowsAffected
			for plan.Next() {
				resultRowsAffected.RowsAffected++
			}

		case parser.Rows:
			resultRows := &driver.Response_Result_Rows{
				Columns: plan.Columns(),
			}

			result.Union = &driver.Response_Result_Rows_{
				Rows: resultRows,
			}
			for plan.Next() {
				values := plan.Values()
				row := driver.Response_Result_Rows_Row{Values: make([]driver.Datum, 0, len(values))}
				for _, val := range values {
					if val == parser.DNull {
						row.Values = append(row.Values, driver.Datum{})
						continue
					}

					switch vt := val.(type) {
					case parser.DBool:
						row.Values = append(row.Values, driver.Datum{
							Payload: &driver.Datum_BoolVal{BoolVal: bool(vt)},
						})
					case parser.DInt:
						row.Values = append(row.Values, driver.Datum{
							Payload: &driver.Datum_IntVal{IntVal: int64(vt)},
						})
					case parser.DFloat:
						row.Values = append(row.Values, driver.Datum{
							Payload: &driver.Datum_FloatVal{FloatVal: float64(vt)},
						})
					case parser.DBytes:
						row.Values = append(row.Values, driver.Datum{
							Payload: &driver.Datum_BytesVal{BytesVal: []byte(vt)},
						})
					case parser.DString:
						row.Values = append(row.Values, driver.Datum{
							Payload: &driver.Datum_StringVal{StringVal: string(vt)},
						})
					case parser.DDate:
						row.Values = append(row.Values, driver.Datum{
							Payload: &driver.Datum_DateVal{DateVal: int64(vt)},
						})
					case parser.DTimestamp:
//.........这里部分代码省略.........

func (e *Executor) execStmt(stmt parser.Statement, planMaker *planner) (driver.Response_Result, error) {
	var result driver.Response_Result
	switch stmt.(type) {
	case *parser.BeginTransaction:
		if planMaker.txn != nil {
			return result, errTransactionInProgress
		}
		// Start a transaction here and not in planMaker to prevent begin
		// transaction from being called within an auto-transaction below.
		planMaker.setTxn(client.NewTxn(e.db), time.Now())
		planMaker.txn.SetDebugName("sql", 0)
	case *parser.CommitTransaction, *parser.RollbackTransaction:
		if planMaker.txn == nil {
			return result, errNoTransactionInProgress
		} else if planMaker.txn.Proto.Status == roachpb.ABORTED {
			// Reset to allow starting a new transaction.
			planMaker.resetTxn()
			return result, nil
		}
	case *parser.SetTransaction:
		if planMaker.txn == nil {
			return result, errNoTransactionInProgress
		}
	default:
		if planMaker.txn != nil && planMaker.txn.Proto.Status == roachpb.ABORTED {
			return result, errTransactionAborted
		}
	}

	// Bind all the placeholder variables in the stmt to actual values.
	if err := parser.FillArgs(stmt, &planMaker.params); err != nil {
		return result, err
	}

	// Create a function which both makes and executes the plan, populating
	// result.
	//
	// TODO(pmattis): Should this be a separate function? Perhaps we should move
	// some of the common code back out into execStmts and have execStmt contain
	// only the body of this closure.
	f := func(timestamp time.Time) error {
		planMaker.evalCtx.StmtTimestamp = parser.DTimestamp{Time: timestamp}
		plan, err := planMaker.makePlan(stmt)
		if err != nil {
			return err
		}

		switch stmt.StatementType() {
		case parser.DDL:
			result.Union = &driver.Response_Result_DDL_{DDL: &driver.Response_Result_DDL{}}
		case parser.RowsAffected:
			resultRowsAffected := driver.Response_Result_RowsAffected{}
			result.Union = &resultRowsAffected
			for plan.Next() {
				resultRowsAffected.RowsAffected++
			}

		case parser.Rows:
			resultRows := &driver.Response_Result_Rows{
				Columns: plan.Columns(),
			}

			result.Union = &driver.Response_Result_Rows_{
				Rows: resultRows,
			}
			for plan.Next() {
				values := plan.Values()
				row := driver.Response_Result_Rows_Row{Values: make([]driver.Datum, 0, len(values))}
				for _, val := range values {
					if val == parser.DNull {
						row.Values = append(row.Values, driver.Datum{})
						continue
					}

					switch vt := val.(type) {
					case parser.DBool:
						row.Values = append(row.Values, driver.Datum{
							Payload: &driver.Datum_BoolVal{BoolVal: bool(vt)},
						})
					case parser.DInt:
						row.Values = append(row.Values, driver.Datum{
							Payload: &driver.Datum_IntVal{IntVal: int64(vt)},
						})
					case parser.DFloat:
						row.Values = append(row.Values, driver.Datum{
							Payload: &driver.Datum_FloatVal{FloatVal: float64(vt)},
						})
					case parser.DBytes:
						row.Values = append(row.Values, driver.Datum{
							Payload: &driver.Datum_BytesVal{BytesVal: []byte(vt)},
						})
					case parser.DString:
						row.Values = append(row.Values, driver.Datum{
							Payload: &driver.Datum_StringVal{StringVal: string(vt)},
						})
					case parser.DDate:
						row.Values = append(row.Values, driver.Datum{
							Payload: &driver.Datum_DateVal{DateVal: int64(vt)},
						})
					case parser.DTimestamp:
//.........这里部分代码省略.........