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Golang Index.Seek方法代码示例

本文整理汇总了Golang中github.com/pingcap/tidb/kv.Index.Seek方法的典型用法代码示例。如果您正苦于以下问题:Golang Index.Seek方法的具体用法?Golang Index.Seek怎么用?Golang Index.Seek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github.com/pingcap/tidb/kv.Index的用法示例。


在下文中一共展示了Index.Seek方法的2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: ScanIndexData

// ScanIndexData scans the index handles and values in a limited number, according to the index information.
// It returns data and the next startVals until it doesn't have data, then returns data is nil and
// the next startVals is the values which can't get data. If startVals = nil and limit = -1,
// it returns the index data of the whole.
func ScanIndexData(txn kv.Transaction, kvIndex kv.Index, startVals []interface{}, limit int64) (
	[]*RecordData, []interface{}, error) {
	it, _, err := kvIndex.Seek(txn, startVals)
	if err != nil {
		return nil, nil, errors.Trace(err)
	}
	defer it.Close()

	var idxRows []*RecordData
	var curVals []interface{}
	for limit != 0 {
		val, h, err1 := it.Next()
		if terror.ErrorEqual(err1, io.EOF) {
			return idxRows, nextIndexVals(curVals), nil
		} else if err1 != nil {
			return nil, nil, errors.Trace(err1)
		}
		idxRows = append(idxRows, &RecordData{Handle: h, Values: val})
		limit--
		curVals = val
	}

	nextVals, _, err := it.Next()
	if terror.ErrorEqual(err, io.EOF) {
		return idxRows, nextIndexVals(curVals), nil
	} else if err != nil {
		return nil, nil, errors.Trace(err)
	}

	return idxRows, nextVals, nil
}
开发者ID:youprofit,项目名称:tidb,代码行数:35,代码来源:inspectkv.go

示例2: GetIndexRecordsCount

// GetIndexRecordsCount returns the total number of the index records from startVals.
// If startVals = nil, returns the total number of the index records.
func GetIndexRecordsCount(txn kv.Transaction, kvIndex kv.Index, startVals []interface{}) (int64, error) {
	it, _, err := kvIndex.Seek(txn, startVals)
	if err != nil {
		return 0, errors.Trace(err)
	}
	defer it.Close()

	var cnt int64
	for {
		_, _, err := it.Next()
		if terror.ErrorEqual(err, io.EOF) {
			break
		} else if err != nil {
			return 0, errors.Trace(err)
		}
		cnt++
	}

	return cnt, nil
}
开发者ID:youprofit,项目名称:tidb,代码行数:22,代码来源:inspectkv.go


注:本文中的github.com/pingcap/tidb/kv.Index.Seek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。