drupal custom block schema

gistfile1.php

<?php

/**
 * @file
 * Block Custom installation routines
 */

/**
 * Implements hook_schema().
 */
function block_custom_schema() {
  $schema['block_custom'] = array(
    'description' => 'Stores Custom BLock items.',
    'fields' => array(
      'bid' => array(
        'type' => 'serial',
        'not null' => TRUE,
        'description' => 'Primary Key: Unique Block item ID.',
        'unsigned' => TRUE,
      ),
      'vid' => array(
        'type' => 'int',
        'not null' => TRUE,
        'description' => 'Revision ID',
        'default' => 0,
        'unsigned' => TRUE,
      ),
      'delta' => array(
        'description' => "The Custom Block's {block}.delta.",
        'type' => 'varchar',
        'length' => 32,
        'not null' => TRUE,
      ),
      'label' => array(
        'description' => 'The Displays in the Admin page.',
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
      ),
      'title' => array(
        'description' => 'The human-readable name of this block.',
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
      ),
      'type' => array(
        'description' => 'The {block_custom_type}.type of this block.',
        'type' => 'varchar',
        'length' => 32,
        'not null' => TRUE,
        'default' => '',
      ),
      'view_mode' => array(
        'description' => 'The View mode to use as the block.',
        'type' => 'varchar',
        'length' => 32,
        'not null' => TRUE,
        'default' => 'default',
      ),
      'data' => array(
        'type' => 'text',
        'not null' => FALSE,
        'size' => 'big',
        'serialize' => TRUE,
        'description' => 'A serialized array of additional data related to this block.',
      ),
    ),
    'foreign keys' => array(
      'type' => array(
        'table' => 'block_custom_type',
        'columns' => array('type' => 'type'),
      ),
      'block_custom_revision' => array(
        'table' => 'block_custom_revision',
        'columns' => array('vid' => 'vid'),
      )
    ),
    'primary key' => array('bid'),
    'unique keys' => array(
      'vid' => array('vid'),
      'delta' => array('delta'),
    ),
  );

  $schema['block_custom_revision'] =  array(
    'description' => 'Stores Custom Block Revisions.',
    'fields' => array(
      'bid' => array(
        'description' => 'The {block} this version belongs to.',
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
      ),
      'vid' => array(
        'description' => 'The primary identifier for this version.',
        'type' => 'serial',
        'unsigned' => TRUE,
        'not null' => TRUE,
      ),
      'uid' => array(
        'description' => 'The author of the revision.',
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
      ),
      'delta' => array(
        'description' => "The bean's {block}.delta.",
        'type' => 'varchar',
        'length' => 32,
        'not null' => TRUE,
      ),
      'label' => array(
        'description' => 'The Displays in the Admin page.',
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
      ),
      'title' => array(
        'description' => 'The human-readable name of this bean.',
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
      ),
      'type' => array(
        'description' => 'The {block_custom_type}.type of this bean.',
        'type' => 'varchar',
        'length' => 32,
        'not null' => TRUE,
        'default' => '',
      ),
      'view_mode' => array(
        'description' => 'The View mode to use as the bean.',
        'type' => 'varchar',
        'length' => 32,
        'not null' => TRUE,
        'default' => 'default',
      ),
      'data' => array(
        'type' => 'text',
        'not null' => FALSE,
        'size' => 'big',
        'serialize' => TRUE,
        'description' => 'A serialized array of additional data related to this block.',
      ),
      'log' => array(
        'description' => t('A log message associated with the revision.'),
        'type' => 'text',
        'size' => 'big',
      ),
      'created' => array(
        'description' => 'The Unix timestamp when the entity was created.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'changed' => array(
        'description' => 'The Unix timestamp when the entity was most recently saved.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
    ),
    'foreign keys' => array(
      'type' => array(
        'table' => 'block_custom_type',
        'columns' => array('type' => 'type'),
      ),
      'version_block' => array(
        'table' => 'block_custom',
        'columns' => array('bid' => 'bid'),
      )
    ),
    'primary key' => array('vid'),
    'indexes' => array(
      'bid' => array('bid', 'vid'),
    ),
  );

  $schema['block_custom_type'] = array(
    'description' => 'Stores information about all defined block types.',
    'fields' => array(
      'name' => array(
        'description' => 'The machine-readable name of this block type.',
        'type' => 'varchar',
        'length' => 32,
        'not null' => TRUE,
      ),
      'label' => array(
        'description' => 'The human-readable name of this block type.',
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
      ),
      'description' => array(
        'description' => 'The description of this block type.',
        'type' => 'text',
        'size' => 'big',
      ),
    ),
    'primary key' => array('name'),
  );

  return $schema;
}

/**
 * Implements hook_uninstall().
 */
function block_custom_uninstall() {
  drupal_load('module', 'block_custom');
  // Bypass entity_load() as we cannot use it here.
  foreach (block_custom_get_types() as $block_type) {
    field_attach_delete_bundle('block_custom', $block_type->type);
  }
}

/**
 * Implements hook_disable().
 */
function block_custom_disable() {
  // Remove all of the currently placed blocks

  // Delete any blocks
  // @see block_custom_block_delete_submit()
  db_delete('block')
    ->condition('module', 'block_custom')
    ->execute();
  db_delete('block_role')
    ->condition('module', 'block_custom')
    ->execute();

  // @see node_form_block_custom_block_delete_submit()
  db_delete('block_node_type')
    ->condition('module', 'block_custom')
    ->execute();
}