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[yaffs-website] / web / core / modules / book / book.install

diff --git a/web/core/modules/book/book.install b/web/core/modules/book/book.install
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+<?php
+
+/**
+ * @file
+ * Install, update and uninstall functions for the book module.
+ */
+
+/**
+ * Implements hook_uninstall().
+ */
+function book_uninstall() {
+  // Clear book data out of the cache.
+  \Drupal::cache('data')->deleteAll();
+}
+
+/**
+ * Implements hook_schema().
+ */
+function book_schema() {
+  $schema['book'] = [
+  'description' => 'Stores book outline information. Uniquely defines the location of each node in the book outline',
+    'fields' => [
+      'nid' => [
+        'type' => 'int',
+        'unsigned' => TRUE,
+        'not null' => TRUE,
+        'default' => 0,
+        'description' => "The book page's {node}.nid.",
+      ],
+      'bid' => [
+        'type' => 'int',
+        'unsigned' => TRUE,
+        'not null' => TRUE,
+        'default' => 0,
+        'description' => "The book ID is the {book}.nid of the top-level page.",
+      ],
+      'pid' => [
+        'description' => 'The parent ID (pid) is the id of the node above in the hierarchy, or zero if the node is at the top level in its outline.',
+        'type' => 'int',
+        'unsigned' => TRUE,
+        'not null' => TRUE,
+        'default' => 0,
+      ],
+      'has_children' => [
+        'description' => 'Flag indicating whether any nodes have this node as a parent (1 = children exist, 0 = no children).',
+        'type' => 'int',
+        'not null' => TRUE,
+        'default' => 0,
+        'size' => 'small',
+      ],
+      'weight' => [
+        'description' => 'Weight among book entries in the same book at the same depth.',
+        'type' => 'int',
+        'not null' => TRUE,
+        'default' => 0,
+      ],
+      'depth' => [
+        'description' => 'The depth relative to the top level. A link with pid == 0 will have depth == 1.',
+        'type' => 'int',
+        'not null' => TRUE,
+        'default' => 0,
+        'size' => 'small',
+      ],
+      'p1' => [
+        'description' => 'The first nid in the materialized path. If N = depth, then pN must equal the nid. If depth > 1 then p(N-1) must equal the pid. All pX where X > depth must equal zero. The columns p1 .. p9 are also called the parents.',
+        'type' => 'int',
+        'unsigned' => TRUE,
+        'not null' => TRUE,
+        'default' => 0,
+      ],
+      'p2' => [
+        'description' => 'The second nid in the materialized path. See p1.',
+        'type' => 'int',
+        'unsigned' => TRUE,
+        'not null' => TRUE,
+        'default' => 0,
+      ],
+      'p3' => [
+        'description' => 'The third nid in the materialized path. See p1.',
+        'type' => 'int',
+        'unsigned' => TRUE,
+        'not null' => TRUE,
+        'default' => 0,
+      ],
+      'p4' => [
+        'description' => 'The fourth nid in the materialized path. See p1.',
+        'type' => 'int',
+        'unsigned' => TRUE,
+        'not null' => TRUE,
+        'default' => 0,
+      ],
+      'p5' => [
+        'description' => 'The fifth nid in the materialized path. See p1.',
+        'type' => 'int',
+        'unsigned' => TRUE,
+        'not null' => TRUE,
+        'default' => 0,
+      ],
+      'p6' => [
+        'description' => 'The sixth nid in the materialized path. See p1.',
+        'type' => 'int',
+        'unsigned' => TRUE,
+        'not null' => TRUE,
+        'default' => 0,
+      ],
+      'p7' => [
+        'description' => 'The seventh nid in the materialized path. See p1.',
+        'type' => 'int',
+        'unsigned' => TRUE,
+        'not null' => TRUE,
+        'default' => 0,
+      ],
+      'p8' => [
+        'description' => 'The eighth nid in the materialized path. See p1.',
+        'type' => 'int',
+        'unsigned' => TRUE,
+        'not null' => TRUE,
+        'default' => 0,
+      ],
+      'p9' => [
+        'description' => 'The ninth nid in the materialized path. See p1.',
+        'type' => 'int',
+        'unsigned' => TRUE,
+        'not null' => TRUE,
+        'default' => 0,
+      ],
+    ],
+    'primary key' => ['nid'],
+    'indexes' => [
+      'book_parents' => ['bid', 'p1', 'p2', 'p3', 'p4', 'p5', 'p6', 'p7', 'p8', 'p9'],
+    ],
+  ];
+
+  return $schema;
+}