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https://github.com/elgs/jsonql

JSON query expression library in Golang.
https://github.com/elgs/jsonql

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JSON query expression library in Golang.

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# jsonql

JSON query expression library in Golang.



This library enables query against JSON. Currently supported operators are: (precedences from low to high)



```

||

&&

= != > < >= <= ~= !~= is isnot contains

+ -

* / %

^

( )

```



The following are the operator mapings to SQL:

* `AND` to `&&`

* `OR`	to `||`

* `RLIKE` to `~=`

* `NOT RLIKE` to `!~=`



## Install

`go get -u github.com/elgs/jsonql`



## Example

```go

package main



import (

	"fmt"



	"github.com/elgs/jsonql"

)



var jsonString = `

[

  {

    "name": "elgs",

    "gender": "m",

    "age": 35,

    "skills": [

      "Golang",

      "Java",

      "C"

    ]

  },

  {

    "name": "enny",

    "gender": "f",

    "age": 36,

    "hobby": null,

    "skills": [

      "IC",

      "Electric design",

      "Verification"

    ]

  },

  {

    "name": "sam",

    "gender": "m",

    "age": 1,

    "hobby": "dancing",

    "skills": [

      "Eating",

      "Sleeping",

      "Crawling"

    ]

  }

]

`



func main() {

	parser, err := jsonql.NewStringQuery(jsonString)

	if err != nil {

		fmt.Println(err)

		return

	}

	fmt.Println(parser.Query("name='elgs'"))

	//[map[skills:[Golang Java C] name:elgs gender:m age:35]] 



	fmt.Println(parser.Query("name='elgs' && gender='f'"))

	//[] 



	fmt.Println(parser.Query("age<10 || (name='enny' && gender='f')"))

	// [map[hobby: skills:[IC Electric design Verification] name:enny gender:f age:36] map[name:sam gender:m age:1 hobby:dancing skills:[Eating Sleeping Crawling]]] 



	fmt.Println(parser.Query("age<10"))

	// [map[gender:m age:1 hobby:dancing skills:[Eating Sleeping Crawling] name:sam]] 



	fmt.Println(parser.Query("1=0"))

	//[] 



	fmt.Println(parser.Query("age=(2*3)^2"))

	//[map[skills:[IC Electric design Verification] name:enny gender:f age:36 hobby:]] 



	fmt.Println(parser.Query("name ~= 'e.*'"))

	// [map[name:elgs gender:m age:35 skills:[Golang Java C]] map[hobby: skills:[IC Electric design Verification] name:enny gender:f age:36]] 



	fmt.Println(parser.Query("name='el'+'gs'"))

	fmt.Println(parser.Query("age=30+5.0"))

	fmt.Println(parser.Query("age=40.0-5"))

	fmt.Println(parser.Query("age=70-5*7"))

	fmt.Println(parser.Query("age=70.0/2.0"))

	fmt.Println(parser.Query("age=71%36"))

	// [map[name:elgs gender:m age:35 skills:[Golang Java C]]] 



	fmt.Println(parser.Query("hobby is defined"))

	// [map[name:enny gender:f age:36 hobby: skills:[IC Electric design Verification]] map[name:sam gender:m age:1 hobby:dancing skills:[Eating Sleeping Crawling]]] 



	fmt.Println(parser.Query("hobby isnot defined"))

	// [map[name:sam gender:m age:1 skills:[Eating Sleeping Crawling]]] 



	fmt.Println(parser.Query("hobby is null"))

	// [map[hobby: skills:[IC Electric design Verification] name:enny gender:f age:36]] 



	fmt.Println(parser.Query("hobby isnot null"))

	// [map[name:sam gender:m age:1 hobby:dancing skills:[Eating Sleeping Crawling]]] 



	fmt.Println(parser.Query("skills contains 'Eating'"))

	// [map[age:1 gender:m hobby:dancing name:sam skills:[Eating Sleeping Crawling]]] 

}

```



## Query Expressions

For details of query expressions, please read: https://github.com/elgs/gojq