json-ql

json defined common sql for dynamic query

version: alpha

Installation

Babel is required sofar.

npm install json-ql

Example

Schema definition

import { Schema } from 'json-ql';
 
const authorMappingTable = Schema.of('author')
  .prop('name')
  .prop('address')
  .prop('status')
  .prop('articles', Schema.Types.collection('article'))
  .table('authors', prop => {
    if (prop == 'articles') {
      return ['authors.id', 'articles.author_id'];
    }
    return prop;
  });
 
 
const articleMappingTable = Schema.of('article')
  .prop('title')
  .prop('status')
  .prop('comments', Schema.Types.collection('comment'))
  .prop('readers', Schema.Types.collection('reader'))
  .table('articles', prop => {
    if (prop == 'comments') return ['articles.id', 'comments.article_id'];
    if (prop == 'readers') return ['articles.id', 'readers.article_id'];
    return prop;
  });
 
const commentsMappingTable = Schema.of('comment')
  .prop('commentTitle')
  .table('comments');
 
const readersMappingTable = Schema.of('reader')
  .prop('name')
  .table('readers');

Create Query

 
import jsonql from 'json-ql';
 
const query = {
  expression: {
    author: {
      name: true,
      articles: {
        title: true,
        'comments c': {
          commentTitle: true
        },
        readers: {
          name: true
        }
      }
    }
  },
  filters: [
    { field: 'c.commentTitle', value: 'i like it', operator: 'like' }
  ]
};
 
const { sql } = jsonql.of([authorMappingTable, articleMappingTable, commentsMappingTable, readersMappingTable]).build(query);

Output

SELECT
  authors_4k.name AS "author.name",
  articles_0V.title AS "author.articles.title",
  comments_Fk.comment_title AS "author.articles.comments.comment_title",
  readers_XF.name AS "author.articles.readers.name"
FROM authors authors_4k
  LEFT JOIN articles articles_0V ON authors_4k.id = articles_0V.author_id
  LEFT JOIN comments comments_Fk ON articles_0V.id = comments_Fk.article_id
  LEFT JOIN readers readers_XF ON articles_0V.id = readers_XF.article_id
WHERE
  comments_Fk.comment_title LIKE '%i like it%'

ParseObj

The flat fetched data could be parsed into object.

const obj = {
  'author.name': '张三',
  'author.articles.status': 'PUBLISHED',
  'author.nameCount': '1'
};
 
const parsed = builder.parseObj(query, obj);
// OUTPUT:
// { name: '张三', nameCount: 1, articles: [{ status: 'PUBLISHED' }] }

Define GroupBy and OrderBy

const query = {
  expression: {
    'author Au': {
      name: true,
      'articles A': {
        status: true
      }
    }
  },
  filters: [
    { field: 'A.status', value: 'PUBLISHED' }
    { field: 'A.status', value: 'PUBLISHED', operator: 'gt', or: true }
    // avaliable operators: gt, gte, lt, lte, eq, like, notEq(neq), between
  ],
  groupBy: [
    'author.name',
    'A.status'
  ],
  orderBy: [
    { field: 'author.name', descending: true },
    { field: 'A.status', descending: false }
  ]
};

Contributors

• lukyw
• winsonwq

TODO

• where something is NULL
• where condition OR condition expression
• having expression

License

Copyright (c) 2013 - 2016 Wang Qiu ([e-mail])

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.