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json collation

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Josh Baker 2016-09-03 11:00:34 -07:00
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@ -344,32 +344,6 @@ Which will return:
[4 8 3]
[4 7 4]
```
## Collate i18n Indexes
Using the external [collate package](https://github.com/tidwall/collate) it's possible to create
indexes that are sorted by the specified langauge. This is similar to the [SQL COLLATE keyword](https://msdn.microsoft.com/en-us/library/ms174596.aspx) found in traditional databases.
To install:
```
go get -u github.com/tidwall/collate
```
For example:
```go
import "github.com/tidwall/collate"
// To sort case-insensitive in French.
db.CreateIndex("name", "*", collate.Index("FRENCH_CI"))
// To specify that numbers should sort numerically ("2" < "12")
// and use a comma to represent a decimal point.
db.CreateIndex("amount", "*", collate.Index("FRENCH_NUM"))
```
Check out the [collate project](https://github.com/tidwall/collate) for more information.
## JSON Indexes
Indexes can be created on individual fields inside JSON documents. BuntDB uses [GJSON](https://github.com/tidwall/gjson) under the hood.
@ -436,6 +410,7 @@ Order by age range 30-50
1: {"name":{"first":"Tom","last":"Johnson"},"age":38}
2: {"name":{"first":"Janet","last":"Prichard"},"age":47}
```
## Multi Value Index
With BuntDB it's possible to join multiple values on a single index.
This is similar to a [multi column index](http://dev.mysql.com/doc/refman/5.7/en/multiple-column-indexes.html) in a traditional SQL database.
@ -482,6 +457,38 @@ db.CreateIndex("last_name_age", "*",
This will create a multi value index where the last name is ascending and the age is descending.
## Collate i18n Indexes
Using the external [collate package](https://github.com/tidwall/collate) it's possible to create
indexes that are sorted by the specified langauge. This is similar to the [SQL COLLATE keyword](https://msdn.microsoft.com/en-us/library/ms174596.aspx) found in traditional databases.
To install:
```
go get -u github.com/tidwall/collate
```
For example:
```go
import "github.com/tidwall/collate"
// To sort case-insensitive in French.
db.CreateIndex("name", "*", collate.IndexString("FRENCH_CI"))
// To specify that numbers should sort numerically ("2" < "12")
// and use a comma to represent a decimal point.
db.CreateIndex("amount", "*", collate.IndexString("FRENCH_NUM"))
```
There's also support for Collation on JSON indexes:
```go
db.CreateIndex("last_name", "*", collate.IndexJSON("CHINESE_CI", "name.last"))
```
Check out the [collate project](https://github.com/tidwall/collate) for more information.
## Data Expiration
Items can be automatically evicted by using the `SetOptions` object in the `Set` function to set a `TTL`.