README

A PHP tool that converts database table definitions in JSON format to SQL CREATE TABLE statements.

Features

✅ Batch conversion of multiple tables
✅ Support for complex field types and attributes
✅ Primary Key support
✅ Unique Key support
✅ Index support
✅ Foreign Key support
✅ AUTO_INCREMENT support
✅ Storage engine configuration (InnoDB, etc.)
✅ Charset and Collation support

Requirements

PHP >= 8.1
Composer

Installation

composer require mathsgod/json-to-sql

Usage

Basic Usage

Create a db.json file in your project root with your table definitions (see JSON Format Specification below).
Create a convert.php script to use the converter:

<?php

require_once 'src/JsonToSql.php';

try {
    $converter = new JsonToSql();
    $sql = $converter->convertJsonToSql('db.json');
    
    echo $sql;
    
    // Optional: Save to file
    // file_put_contents('output.sql', $sql);
    
} catch (Exception $e) {
    echo "Error: " . $e->getMessage() . "\n";
    exit(1);
}

Output

The converted SQL statements will be output to the console. You can also save them to a file by uncommenting the file_put_contents() line or redirecting the output.

JSON Format Specification

The JSON file should contain an array of tables, each with the following structure:

Table Structure

[
  {
    "name": "users",
    "charset": "utf8mb4",
    "collate": "utf8mb4_unicode_ci",
    "engine": "InnoDB",
    "columns": [
      {
        "name": "id",
        "type": "INT",
        "unsigned": true,
        "nullable": false,
        "auto_increment": true
      },
      {
        "name": "username",
        "type": "VARCHAR",
        "length": 255,
        "nullable": false
      },
      {
        "name": "email",
        "type": "VARCHAR",
        "length": 255,
        "nullable": false
      },
      {
        "name": "created_at",
        "type": "TIMESTAMP",
        "default": "CURRENT_TIMESTAMP",
        "nullable": false
      }
    ],
    "primary_key": ["id"],
    "unique_keys": [
      {
        "name": "uk_username",
        "columns": ["username"]
      },
      {
        "name": "uk_email",
        "columns": ["email"]
      }
    ],
    "indexes": [
      {
        "name": "idx_created_at",
        "columns": ["created_at"]
      }
    ],
    "foreign_keys": []
  }
]

Column Attributes

Attribute	Type	Description	Required
`name`	string	Column name	✅
`type`	string	Column type (VARCHAR, INT, DATETIME, etc.)	✅
`length`	integer	Column length (for VARCHAR, CHAR, etc.)	❌
`unsigned`	boolean	Whether unsigned (for numeric types)	❌
`nullable`	boolean	Allow NULL (default: true)	❌
`auto_increment`	boolean	Auto increment	❌
`default`	string\|integer	Default value	❌

Table Attributes

Attribute	Type	Description	Default
`name`	string	Table name	-
`columns`	array	Array of columns	[]
`primary_key`	array	Primary key columns	[]
`unique_keys`	array	Array of unique keys	[]
`indexes`	array	Array of indexes	[]
`foreign_keys`	array	Array of foreign keys	[]
`engine`	string	Storage engine	InnoDB
`charset`	string	Character set	utf8mb4
`collate`	string	Collation	null

Foreign Key Configuration

"foreign_keys": [
  {
    "columns": ["user_id"],
    "reference_table": "users",
    "reference_columns": ["id"],
    "on_update": "CASCADE",
    "on_delete": "CASCADE"
  }
]

Examples

Create your db.json file in the project root with table definitions following the JSON Format Specification below.

License

MIT

Author

Raymond Chong (mathsgod@yahoo.com)

mathsgod / json-to-sql

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