@sql-vis

Installation:

You should have graphviz installed.

MacOS

> brew install graphiz

Windows

> choco install graphviz

Other installatiom methods can be found on Graphviz website

Usage:

Script watches for changes in your sql and updates png ons save.

> npx sql-vis <filename.sql> <output-image.png>

Example SQL:

CREATE TABLE item (
  id INT NOT NULL,
  PRIMARY KEY (id),
  descr VARCHAR(255)
);

CREATE TABLE manufacturer_item (
  item_id INT NOT NULL,
  manufacturer_id INT NOT NULL,
  quantity INT NOT NULL,
  PRIMARY KEY (item_id, manufacturer_id),
  FOREIGN KEY (item_id) REFERENCES item(id),
  FOREIGN KEY (manufacturer_id) REFERENCES manufacturer(id)
);

CREATE TABLE manufacturer (
  id INT NOT NULL,
  PRIMARY KEY(id),
  phone INT NOT NULL
);

Supported SQL

Statements

CREATE TABLE <tableName> ( ... ); only since the goal of this project is to visualize table definitions in Martin's ERD notation.

Types:

• VARCHAR(<integer>)
• INT
• TEXT
• DATETIME
• DECIMAL(<integer>, <integer>)
• DATE

Table constraints

• PRIMARY KEY (<columnName>)

• FOREIGN KEY (<selfColumn>) REFERENCES <foreignTable>(<foreignColumn>) <MANDATORY?>

  MANDATORY is project specific keyword used to mark that relationship is mandatory for referenced table

Column modifiers

• NOT NULL
• AUTO INCREMENT

One more thing

• Trailing commas are supportedonly inside CREATE TABLE :(
• Semicolomns are required after CREATE TABLE statement

How Do They Do It

Tool uses Peg.js to parse SQL abstract syntax tree, set of custom rules for deriving relationship types, and custom dot generator. The source code split in corresponding files. There are no docs ot comments for now, but you are always free to contribute.