elasticsql

README

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Overview

This tool converts sql to elasticsearch dsl

Currently support:

• sql and expression
• sql or expression
• equal(=) support
• not equal(!=) support
• gt(>) support
• gte(>=) support
• lt(<) support
• lte(<=) support
• sql in (eg. id in (1,2,3) ) expression
• sql not in (eg. id not in (1,2,3) ) expression
• paren bool support (eg. where (a=1 or b=1) and (c=1 or d=1))
• sql like expression (currently use match phrase, perhaps will change to wildcard in the future)
• sql order by support
• sql limit support
• sql not like expression
• field missing check
• support aggregation like count(*), count(field), min(field), max(field), avg(field)
• support aggregation like stats(field), extended_stats(field), percentiles(field) which are not standard sql function
• null check expression(is null/is not null)
• join expression
• having support

Usage

go get -u github.com/cch123/elasticsql

Demo :

package main

import (
    "fmt"

    "github.com/cch123/elasticsql"
)

var sql = `
select * from aaa
where a=1 and x = '三个男人'
and create_time between '2015-01-01T00:00:00+0800' and '2016-01-01T00:00:00+0800'
and process_id > 1 order by id desc limit 100,10
`

func main() {
    dsl, esType, _ := elasticsql.Convert(sql)
    fmt.Println(dsl)
    fmt.Println(esType)
}

will produce :

{
    "query": {
        "bool": {
            "must": [
                {
                    "match": {
                        "a": {
                            "query": "1",
                            "type": "phrase"
                        }
                    }
                },
                {
                    "match": {
                        "x": {
                            "query": "三个男人",
                            "type": "phrase"
                        }
                    }
                },
                {
                    "range": {
                        "create_time": {
                            "from": "2015-01-01T00:00:00+0800",
                            "to": "2016-01-01T00:00:00+0800"
                        }
                    }
                },
                {
                    "range": {
                        "process_id": {
                            "gt": "1"
                        }
                    }
                }
            ]
        }
    },
    "from": 100,
    "size": 10,
    "sort": [
        {
            "id": "desc"
        }
    ]
}

aaa

If your sql contains some keywords, eg. order, timestamp, don't forget to escape these fields as follows:

select * from `order` where `timestamp` = 1 and `desc`.id > 0

Warning

To use this tool, you need to understand the term query and match phrase query of elasticsearch.

Setting a field to analyzed or not analyzed will get different results.

Details

For more details of convertion, please refer to the wiki

Other info

When writing this tool, I tried to avoid the deprecated dsl filters and aggregations, so it is compatible with most versions of the elasticsearch

If you have any advices or ideas, welcome to submit an issue or Pull Request!

License

MIT

Documentation

Index

• func Convert(sql string) (dsl string, table string, err error)
• func ConvertPretty(sql string) (dsl string, table string, err error)

Functions

func Convert

func Convert(sql string) (dsl string, table string, err error)

Convert will transform sql to elasticsearch dsl string

func ConvertPretty

func ConvertPretty(sql string) (dsl string, table string, err error)

ConvertPretty will transform sql to elasticsearch dsl, and prettify the output json