test1/public/drupal/core/modules/dblog/dblog.install

<?php

/**
 * @file
 * Install, update and uninstall functions for the dblog module.
 */

/**
 * Implements hook_schema().
 */
function dblog_schema() {
  $schema['watchdog'] = [
    'description' => 'Table that contains logs of all system events.',
    'fields' => [
      'wid' => [
        'type' => 'serial',
        'not null' => TRUE,
        'description' => 'Primary Key: Unique watchdog event ID.',
      ],
      'uid' => [
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'description' => 'The {users}.uid of the user who triggered the event.',
      ],
      'type' => [
        'type' => 'varchar_ascii',
        'length' => 64,
        'not null' => TRUE,
        'default' => '',
        'description' => 'Type of log message, for example "user" or "page not found."',
      ],
      'message' => [
        'type' => 'text',
        'not null' => TRUE,
        'size' => 'big',
        'description' => 'Text of log message to be passed into the t() function.',
      ],
      'variables' => [
        'type' => 'blob',
        'not null' => TRUE,
        'size' => 'big',
        'description' => 'Serialized array of variables that match the message string and that is passed into the t() function.',
      ],
      'severity' => [
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'size' => 'tiny',
        'description' => 'The severity level of the event; ranges from 0 (Emergency) to 7 (Debug)',
      ],
      'link' => [
        'type' => 'text',
        'not null' => FALSE,
        'description' => 'Link to view the result of the event.',
      ],
      'location'  => [
        'type' => 'text',
        'not null' => TRUE,
        'description' => 'URL of the origin of the event.',
      ],
      'referer' => [
        'type' => 'text',
        'not null' => FALSE,
        'description' => 'URL of referring page.',
      ],
      'hostname' => [
        'type' => 'varchar_ascii',
        'length' => 128,
        'not null' => TRUE,
        'default' => '',
        'description' => 'Hostname of the user who triggered the event.',
      ],
      'timestamp' => [
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'description' => 'Unix timestamp of when event occurred.',
      ],
    ],
    'primary key' => ['wid'],
    'indexes' => [
      'type' => ['type'],
      'uid' => ['uid'],
      'severity' => ['severity'],
    ],
  ];

  return $schema;
}