README

Check and change the existing SQL-schema and alters it to according requested schema

About

This lib helps to migrate to the given schema from the current schema.

Installation

The preferred method of installation is via Composer. Run the following command to install the package and add it as a requirement to your project's composer.json:

composer require safronik/db-migrator

or just download files or clone repository (in this case you should bother about autoloader)

Usage

Restrictions

You need to do few things before usage.

• Firstly, you should implement DBMigratorGatewayInterface to create the gateway.

namespace Safronik\DBMigrator;

use Safronik\DBMigrator\Objects\Table;

interface DBMigratorGatewayInterface
{
    public function isTableExists( $table ): bool;
    public function createTable( Table $table ): bool;
    public function getTablesNames(): array;
    public function getTableColumns( string $table ): array;
    public function getTableIndexes( string $table ): array;
    public function getTableConstraints( string $table ): array;
    public function alterTable( $table, array $columns = [], array $indexes = [], array $constraints = [] ): bool;
    public function dropTable( $table ): bool;
}

Like this:

class DBMigratorGatewayInterfaceImplementation implements \Safronik\DBMigrator\DBMigratorGatewayInterface
{
    // Your implementation of the interface
}

• Secondly, you should make schema provider or just provide object Schemas to migrator object. You can use self::getCurrentSchemas() to get current schemas.

$migrator = new DBMigrator( $migrator_gateway );
$schemas  = $migrator->getCurrentSchemas();

Anyway, here is an example of the manual Schemas object creation:

$schemas = new Schemas([
    new Table(
        'example_table',
        
        // Columns 
        [
            new Column([
                'field'   => 'id',      // Required
                'type'    => 'INT(11)', // Required
                'null'    => 'no',  
                'default' => ''   
                'extra'   => 'AUTO INCREMENT',
                'comment' => 'Primary key',
            ]),            
            new Column([
                'field'   => 'value_field', // Required
                'type'    => 'TEXT',        // Required
                'null'    => 'yes',  
                'default' => 'null',   
                'extra'   => '',
                'comment' => 'Desc',
            ]),            
            // ...
        ],
        
        // Indexes (optional)
        [
            new Index([
                'key_name' => 'PRIMARY', // Required
                'columns'  => ['id'],    // Required
                'unique'   => true,
                'type'     => 'BTREE',
                'comment'  => 'Primary key',
            ]),
            // ...    
        ],
        
        // Constraints (optional)
        [
            new Constraint([
                'name'             => 'Example constraint', // Required
                'column'           => 'id',                 // Required
                'reference_table'  => 'examples2',          // Required
                'reference_column' => 'example_id',         // Required
                'on_update'        => '',
                'on_delete'        => '',
            ]),
            // ...    
        ],
    )
]);

And finally after all that you can proceed:

$migrator = new DBMigrator( 
    new DBMigratorGatewayInterfaceImplementation() 
);

$migrator
    ->setSchemas( $schemas )
    ->compareWithCurrentStructure()
    ->actualizeSchema();

Also, you can drop existing schema:

$migrator = new DBMigrator( 
    new DBMigratorGatewayInterfaceImplementation() 
);

$migrator
    ->setSchemas( $migrator->getCurrentSchemas() )
    ->dropSchema();