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https://github.com/wmfs/pg-diff-sync

Takes two objects that describe the structure of a database and produces the PostgreSQL statements required to get from one to the other.
https://github.com/wmfs/pg-diff-sync

package postgresql tymly

Last synced: 3 months ago
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Takes two objects that describe the structure of a database and produces the PostgreSQL statements required to get from one to the other.

Host: GitHub
URL: https://github.com/wmfs/pg-diff-sync
Owner: wmfs
License: mit
Created: 2018-06-11T11:53:57.000Z (over 6 years ago)
Default Branch: master
Last Pushed: 2024-09-27T21:32:07.000Z (4 months ago)
Last Synced: 2024-10-14T06:29:42.690Z (3 months ago)
Topics: package, postgresql, tymly
Language: JavaScript
Homepage:
Size: 394 KB
Stars: 7
Watchers: 8
Forks: 0
Open Issues: 5
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE

Awesome Lists containing this project

README

        # pg-diff-sync

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> Takes two objects that describe the structure of a database and produces the PostgreSQL statements required to get from one to the other.

## Install

```bash

$ npm install pg-diff-sync --save

```

## Usage

```javascript

  const pgDiffSync = require('pg-diff-sync')

  const currentDbStructure = {...} 

  const expectedDbStructure = {...} 

  const statements = pgDiffSync(

    currentDbStructure,

    expectedDbStructure

  )  

  // Returns an array of DDL statements to apply on the PostgreSQL database

```

## API

### pgDiffSync(baseDbStructure, targetDbStructure)

### Arguments:

| Arg  | Type | Notes |

| ---  | ----- | ------ |

| `baseDbStructure`  | `object`  | An object representing the original starting position of a database - most likely the output conjured from the __[pg-info](https://github.com/wmfs/pg-info)__ package |

| `targetDbStructure`  | `object`  | And an object representing how the database needs to be - in the same form as `baseDbStructure` (again see the __[pg-info](https://github.com/wmfs/pg-info)__ package for more details) |

## Output

The output from __pg-diff-sync__ is a simple array of strings.

* Each string is a separate DDL statement, that should be run on the PostgreSQL database that produced the `baseDbStructure` object. 

* With some caveats, running these statements on the _base_ database will turn it into the _target_ database

__Example output__

```json

[

  "CREATE SCHEMA pg_diff_sync_test;",

  "COMMENT ON SCHEMA pg_diff_sync_test IS 'Schema auto-generated by Relationize.js!';",

  "CREATE TABLE pg_diff_sync_test.people();",

  "COMMENT ON TABLE pg_diff_sync_test.people IS 'Just a simple list of people!';",

  "ALTER TABLE pg_diff_sync_test.people ADD COLUMN employee_no text NOT NULL;",

  "ALTER TABLE pg_diff_sync_test.people ADD COLUMN first_name text NOT NULL;",

  "ALTER TABLE pg_diff_sync_test.people ADD COLUMN last_name text NOT NULL;",

  "ALTER TABLE pg_diff_sync_test.people ADD COLUMN age integer;",

  "ALTER TABLE pg_diff_sync_test.people ADD COLUMN _created timestamp with time zone NOT NULL DEFAULT now();",

  "ALTER TABLE pg_diff_sync_test.people ADD COLUMN _created_by text;",

  "ALTER TABLE pg_diff_sync_test.people ADD COLUMN _modified timestamp with time zone NOT NULL DEFAULT now();",

  "ALTER TABLE pg_diff_sync_test.people ADD COLUMN _modified_by text;",

  "COMMENT ON COLUMN pg_diff_sync_test.people.first_name IS 'Person''s first name';",

  "COMMENT ON COLUMN pg_diff_sync_test.people.age IS 'Age in years';",

  "COMMENT ON COLUMN pg_diff_sync_test.people._created IS 'Timestamp for when this record was created';",

  "COMMENT ON COLUMN pg_diff_sync_test.people._created_by IS 'UserID that created this record (if known)';",

  "COMMENT ON COLUMN pg_diff_sync_test.people._modified IS 'Timestamp for when this record was last updated';",

  "COMMENT ON COLUMN pg_diff_sync_test.people._modified_by IS 'UserID that last modified this record (if known)';",

  "ALTER TABLE pg_diff_sync_test.people ADD PRIMARY KEY (employee_no);",

  "CREATE UNIQUE INDEX people_first_name_last_name_idx ON pg_diff_sync_test.people (first_name,last_name);"

]

```

## Testing

```bash

$ npm test

```

## License

[MIT](https://github.com/wmfs/pg-diff-sync/blob/master/LICENSE)