Golang SelectStatement.String方法代码示例

本文整理汇总了Golang中github.com/influxdata/influxdb/influxql.SelectStatement.String方法的典型用法代码示例。如果您正苦于以下问题：Golang SelectStatement.String方法的具体用法？Golang SelectStatement.String怎么用？Golang SelectStatement.String使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类github.com/influxdata/influxdb/influxql.SelectStatement的用法示例。

在下文中一共展示了SelectStatement.String方法的4个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Golang代码示例。

示例1: executeSelectStatement

func (e *StatementExecutor) executeSelectStatement(stmt *influxql.SelectStatement, ctx *influxql.ExecutionContext) error {
	itrs, stmt, err := e.createIterators(stmt, ctx)
	if err != nil {
		return err
	}

	// Generate a row emitter from the iterator set.
	em := influxql.NewEmitter(itrs, stmt.TimeAscending(), ctx.ChunkSize)
	em.Columns = stmt.ColumnNames()
	em.OmitTime = stmt.OmitTime
	defer em.Close()

	// Emit rows to the results channel.
	var writeN int64
	var emitted bool

	var pointsWriter *BufferedPointsWriter
	if stmt.Target != nil {
		pointsWriter = NewBufferedPointsWriter(e.PointsWriter, stmt.Target.Measurement.Database, stmt.Target.Measurement.RetentionPolicy, 10000)
	}

	for {
		row, partial, err := em.Emit()
		if err != nil {
			return err
		} else if row == nil {
			// Check if the query was interrupted while emitting.
			select {
			case <-ctx.InterruptCh:
				return influxql.ErrQueryInterrupted
			default:
			}
			break
		}

		// Write points back into system for INTO statements.
		if stmt.Target != nil {
			if err := e.writeInto(pointsWriter, stmt, row); err != nil {
				return err
			}
			writeN += int64(len(row.Values))
			continue
		}

		result := &influxql.Result{
			StatementID: ctx.StatementID,
			Series:      []*models.Row{row},
			Partial:     partial,
		}

		// Send results or exit if closing.
		if err := ctx.Send(result); err != nil {
			return err
		}

		emitted = true
	}

	// Flush remaining points and emit write count if an INTO statement.
	if stmt.Target != nil {
		if err := pointsWriter.Flush(); err != nil {
			return err
		}

		var messages []*influxql.Message
		if ctx.ReadOnly {
			messages = append(messages, influxql.ReadOnlyWarning(stmt.String()))
		}

		return ctx.Send(&influxql.Result{
			StatementID: ctx.StatementID,
			Messages:    messages,
			Series: []*models.Row{{
				Name:    "result",
				Columns: []string{"time", "written"},
				Values:  [][]interface{}{{time.Unix(0, 0).UTC(), writeN}},
			}},
		})
	}

	// Always emit at least one result.
	if !emitted {
		return ctx.Send(&influxql.Result{
			StatementID: ctx.StatementID,
			Series:      make([]*models.Row, 0),
		})
	}

	return nil
}

开发者ID:li-ang，项目名称:influxdb，代码行数:90，代码来源:statement_executor.go

示例2: executeSelectStatement

func (e *StatementExecutor) executeSelectStatement(stmt *influxql.SelectStatement, ctx *influxql.ExecutionContext) error {
	// Handle SHOW TAG VALUES separately so it can be optimized.
	// https://github.com/influxdata/influxdb/issues/6233
	if source, ok := stmt.Sources[0].(*influxql.Measurement); ok && source.Name == "_tags" {
		// Use the optimized version only if we have direct access to the database.
		if store, ok := e.TSDBStore.(LocalTSDBStore); ok {
			return e.executeShowTagValues(stmt, ctx, store)
		}
	}

	itrs, stmt, err := e.createIterators(stmt, ctx)
	if err != nil {
		return err
	}

	// Generate a row emitter from the iterator set.
	em := influxql.NewEmitter(itrs, stmt.TimeAscending(), ctx.ChunkSize)
	em.Columns = stmt.ColumnNames()
	em.OmitTime = stmt.OmitTime
	defer em.Close()

	// Calculate initial stats across all iterators.
	stats := influxql.Iterators(itrs).Stats()
	if e.MaxSelectSeriesN > 0 && stats.SeriesN > e.MaxSelectSeriesN {
		return fmt.Errorf("max select series count exceeded: %d series", stats.SeriesN)
	}

	// Emit rows to the results channel.
	var writeN int64
	var emitted bool

	var pointsWriter *BufferedPointsWriter
	if stmt.Target != nil {
		pointsWriter = NewBufferedPointsWriter(e.PointsWriter, stmt.Target.Measurement.Database, stmt.Target.Measurement.RetentionPolicy, 10000)
	}

	for {
		row, err := em.Emit()
		if err != nil {
			return err
		} else if row == nil {
			// Check if the query was interrupted while emitting.
			select {
			case <-ctx.InterruptCh:
				return influxql.ErrQueryInterrupted
			default:
			}
			break
		}

		// Write points back into system for INTO statements.
		if stmt.Target != nil {
			if err := e.writeInto(pointsWriter, stmt, row); err != nil {
				return err
			}
			writeN += int64(len(row.Values))
			continue
		}

		result := &influxql.Result{
			StatementID: ctx.StatementID,
			Series:      []*models.Row{row},
		}

		// Send results or exit if closing.
		select {
		case <-ctx.InterruptCh:
			return influxql.ErrQueryInterrupted
		case ctx.Results <- result:
		}

		emitted = true
	}

	// Flush remaing points and emit write count if an INTO statement.
	if stmt.Target != nil {
		if err := pointsWriter.Flush(); err != nil {
			return err
		}

		var messages []*influxql.Message
		if ctx.ReadOnly {
			messages = append(messages, influxql.ReadOnlyWarning(stmt.String()))
		}

		ctx.Results <- &influxql.Result{
			StatementID: ctx.StatementID,
			Messages:    messages,
			Series: []*models.Row{{
				Name:    "result",
				Columns: []string{"time", "written"},
				Values:  [][]interface{}{{time.Unix(0, 0).UTC(), writeN}},
			}},
		}
		return nil
	}

	// Always emit at least one result.
	if !emitted {
		ctx.Results <- &influxql.Result{
//.........这里部分代码省略.........

开发者ID:ChenXiukun，项目名称:influxdb，代码行数:101，代码来源:statement_executor.go

示例3: executeSelectStatement


//.........这里部分代码省略.........
		return err
	}

	if e.MaxSelectPointN > 0 {
		monitor := influxql.PointLimitMonitor(itrs, influxql.DefaultStatsInterval, e.MaxSelectPointN)
		ctx.Query.Monitor(monitor)
	}

	// Generate a row emitter from the iterator set.
	em := influxql.NewEmitter(itrs, stmt.TimeAscending(), ctx.ChunkSize)
	em.Columns = stmt.ColumnNames()
	em.OmitTime = stmt.OmitTime
	defer em.Close()

	// Calculate initial stats across all iterators.
	stats := influxql.Iterators(itrs).Stats()
	if e.MaxSelectSeriesN > 0 && stats.SeriesN > e.MaxSelectSeriesN {
		return fmt.Errorf("max select series count exceeded: %d series", stats.SeriesN)
	}

	// Emit rows to the results channel.
	var writeN int64
	var emitted bool

	var pointsWriter *BufferedPointsWriter
	if stmt.Target != nil {
		pointsWriter = NewBufferedPointsWriter(e.PointsWriter, stmt.Target.Measurement.Database, stmt.Target.Measurement.RetentionPolicy, 10000)
	}

	for {
		row, err := em.Emit()
		if err != nil {
			return err
		} else if row == nil {
			// Check if the query was interrupted while emitting.
			select {
			case <-ctx.InterruptCh:
				return influxql.ErrQueryInterrupted
			default:
			}
			break
		}

		// Write points back into system for INTO statements.
		if stmt.Target != nil {
			if err := e.writeInto(pointsWriter, stmt, row); err != nil {
				return err
			}
			writeN += int64(len(row.Values))
			continue
		}

		result := &influxql.Result{
			StatementID: ctx.StatementID,
			Series:      []*models.Row{row},
		}

		// Send results or exit if closing.
		select {
		case <-ctx.InterruptCh:
			return influxql.ErrQueryInterrupted
		case ctx.Results <- result:
		}

		emitted = true
	}

	// Flush remaing points and emit write count if an INTO statement.
	if stmt.Target != nil {
		if err := pointsWriter.Flush(); err != nil {
			return err
		}

		var messages []*influxql.Message
		if ctx.ReadOnly {
			messages = append(messages, influxql.ReadOnlyWarning(stmt.String()))
		}

		ctx.Results <- &influxql.Result{
			StatementID: ctx.StatementID,
			Messages:    messages,
			Series: []*models.Row{{
				Name:    "result",
				Columns: []string{"time", "written"},
				Values:  [][]interface{}{{time.Unix(0, 0).UTC(), writeN}},
			}},
		}
		return nil
	}

	// Always emit at least one result.
	if !emitted {
		ctx.Results <- &influxql.Result{
			StatementID: ctx.StatementID,
			Series:      make([]*models.Row, 0),
		}
	}

	return nil
}

开发者ID:wutaizeng，项目名称:kapacitor，代码行数:101，代码来源:statement_executor.go

示例4: executeSelectStatement


//.........这里部分代码省略.........
			buckets := int64(max.Sub(min)) / int64(interval)
			if int(buckets) > e.MaxSelectBucketsN {
				return fmt.Errorf("max select bucket count exceeded: %d buckets", buckets)
			}
		}
	}

	// Create a set of iterators from a selection.
	itrs, err := influxql.Select(stmt, ic, &opt)
	if err != nil {
		return err
	}

	if e.MaxSelectPointN > 0 {
		monitor := influxql.PointLimitMonitor(itrs, influxql.DefaultStatsInterval, e.MaxSelectPointN)
		ctx.Query.Monitor(monitor)
	}

	// Generate a row emitter from the iterator set.
	em := influxql.NewEmitter(itrs, stmt.TimeAscending(), ctx.ChunkSize)
	em.Columns = stmt.ColumnNames()
	em.OmitTime = stmt.OmitTime
	defer em.Close()

	// Calculate initial stats across all iterators.
	stats := influxql.Iterators(itrs).Stats()
	if e.MaxSelectSeriesN > 0 && stats.SeriesN > e.MaxSelectSeriesN {
		return fmt.Errorf("max select series count exceeded: %d series", stats.SeriesN)
	}

	// Emit rows to the results channel.
	var writeN int64
	var emitted bool
	for {
		row, err := em.Emit()
		if err != nil {
			return err
		} else if row == nil {
			// Check if the query was interrupted while emitting.
			select {
			case <-ctx.InterruptCh:
				return influxql.ErrQueryInterrupted
			default:
			}
			break
		}

		// Write points back into system for INTO statements.
		if stmt.Target != nil {
			if err := e.writeInto(stmt, row); err != nil {
				return err
			}
			writeN += int64(len(row.Values))
			continue
		}

		result := &influxql.Result{
			StatementID: ctx.StatementID,
			Series:      []*models.Row{row},
		}

		// Send results or exit if closing.
		select {
		case <-ctx.InterruptCh:
			return influxql.ErrQueryInterrupted
		case ctx.Results <- result:
		}

		emitted = true
	}

	// Emit write count if an INTO statement.
	if stmt.Target != nil {
		var messages []*influxql.Message
		if ctx.ReadOnly {
			messages = append(messages, influxql.ReadOnlyWarning(stmt.String()))
		}

		ctx.Results <- &influxql.Result{
			StatementID: ctx.StatementID,
			Messages:    messages,
			Series: []*models.Row{{
				Name:    "result",
				Columns: []string{"time", "written"},
				Values:  [][]interface{}{{time.Unix(0, 0).UTC(), writeN}},
			}},
		}
		return nil
	}

	// Always emit at least one result.
	if !emitted {
		ctx.Results <- &influxql.Result{
			StatementID: ctx.StatementID,
			Series:      make([]*models.Row, 0),
		}
	}

	return nil
}

开发者ID:viru，项目名称:influxdb，代码行数:101，代码来源:statement_executor.go

注：本文中的github.com/influxdata/influxdb/influxql.SelectStatement.String方法示例由纯净天空整理自Github/MSDocs等开源代码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。