[英]How to use RediSearch and RedisJSON to query documents based on a condition (comparison operators)?
I have the following data stored as json using RedisJSON and I want to query a particular set of rows based on input criteria using RediSearch.我使用 RedisJSON 将以下数据存储为 json,我想使用 RediSearch 根据输入条件查询一组特定的行。
Ex Data:防爆数据:
{
"Ticker": "AAPL",
"Name": "Apple Inc.",
"returns": [
{ "Range": { "Begin": "9/6/2014", "End": "4/5/2020"}, "Value": "0.0231"},
{ "Range": { "Begin": "11/12/2011", "End": "14/9/2021"}, "Value": "1.455"},
{ "Range": { "Begin": "1/2/2016", "End": "25/7/2022"}, "Value": "0.436"},
{ "Range": { "Begin": "24/6/2012", "End": "18/5/2016"}, "Value": "2.756"},
{ "Range": { "Begin": "14/8/2017", "End": "8/7/2020"}, "Value": "0.945"},
{ "Range": { "Begin": "9/12/2019", "End": "22/10/2015"}, "Value": "4.256"},
]
}
For example if the input given is "1/1/2015", then I would like to fetch only the records which have "Range.Begin" less than the input value.例如,如果给定的输入是“1/1/2015”,那么我只想获取“Range.Begin”小于输入值的记录。 So it should return the following rows from the json document.
因此它应该返回 json 文档中的以下行。
{ "Range": { "Begin": "9/6/2014", "End": "4/5/2020"}, "Value": "0.0231"},
{ "Range": { "Begin": "11/12/2011", "End": "14/9/2021"}, "Value": "1.455"},
{ "Range": { "Begin": "24/6/2012", "End": "18/5/2016"}, "Value": "2.756"}
How can I create an index using RediSearch with such a requirement?我如何使用 RediSearch 创建具有此类要求的索引?
Note: All the values stored in json are strings.注意:json 中存储的所有值都是字符串。 And it might not be possible to do a comparison on strings in this case.
在这种情况下,可能无法对字符串进行比较。 So, please let me know if the comparison works if dates are changed to numerical values like "11122011" from "11/12/2011".
因此,如果日期从“11/12/2011”更改为“11122011”等数值,请告诉我比较是否有效。
First you need to create an index that will index @Begin
.首先,您需要创建一个索引
@Begin
的索引。
eg例如
FT.CREATE myidx ON JSON PREFIX 1 ticker: SCHEMA $.Ticker.returns[*].Range.Begin AS begin TEXT
Then you can utilize this index on your query and last project only the relevant parts.然后您可以在您的查询中使用此索引,并仅对相关部分进行最后的项目。
eg例如
> ft.search myidx '@begin:24/6/2012' RETURN 3 "$.returns[?(@.Range.Begin=='24/6/2012')]" as d DIALECT 3
1) (integer) 1
2) "ticker:apple"
3) 1) "d"
2) "[{\"Range\":{\"Begin\":\"24/6/2012\",\"End\":\"18/5/2016\"},\"Value\":\"2.756\"}]"
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