diff core/lib/Drupal/Core/Database/Schema.php @ 0:4c8ae668cc8c

Initial import (non-working)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/lib/Drupal/Core/Database/Schema.php	Wed Nov 29 16:09:58 2017 +0000
@@ -0,0 +1,661 @@
+<?php
+
+namespace Drupal\Core\Database;
+
+use Drupal\Core\Database\Query\Condition;
+use Drupal\Core\Database\Query\PlaceholderInterface;
+
+/**
+ * Provides a base implementation for Database Schema.
+ */
+abstract class Schema implements PlaceholderInterface {
+
+  /**
+   * The database connection.
+   *
+   * @var \Drupal\Core\Database\Connection
+   */
+  protected $connection;
+
+  /**
+   * The placeholder counter.
+   */
+  protected $placeholder = 0;
+
+  /**
+   * Definition of prefixInfo array structure.
+   *
+   * Rather than redefining DatabaseSchema::getPrefixInfo() for each driver,
+   * by defining the defaultSchema variable only MySQL has to re-write the
+   * method.
+   *
+   * @see DatabaseSchema::getPrefixInfo()
+   */
+  protected $defaultSchema = 'public';
+
+  /**
+   * A unique identifier for this query object.
+   */
+  protected $uniqueIdentifier;
+
+  public function __construct($connection) {
+    $this->uniqueIdentifier = uniqid('', TRUE);
+    $this->connection = $connection;
+  }
+
+  /**
+   * Implements the magic __clone function.
+   */
+  public function __clone() {
+    $this->uniqueIdentifier = uniqid('', TRUE);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function uniqueIdentifier() {
+    return $this->uniqueIdentifier;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function nextPlaceholder() {
+    return $this->placeholder++;
+  }
+
+  /**
+   * Get information about the table name and schema from the prefix.
+   *
+   * @param
+   *   Name of table to look prefix up for. Defaults to 'default' because that's
+   *   default key for prefix.
+   * @param $add_prefix
+   *   Boolean that indicates whether the given table name should be prefixed.
+   *
+   * @return
+   *   A keyed array with information about the schema, table name and prefix.
+   */
+  protected function getPrefixInfo($table = 'default', $add_prefix = TRUE) {
+    $info = [
+      'schema' => $this->defaultSchema,
+      'prefix' => $this->connection->tablePrefix($table),
+    ];
+    if ($add_prefix) {
+      $table = $info['prefix'] . $table;
+    }
+    // If the prefix contains a period in it, then that means the prefix also
+    // contains a schema reference in which case we will change the schema key
+    // to the value before the period in the prefix. Everything after the dot
+    // will be prefixed onto the front of the table.
+    if (($pos = strpos($table, '.')) !== FALSE) {
+      // Grab everything before the period.
+      $info['schema'] = substr($table, 0, $pos);
+      // Grab everything after the dot.
+      $info['table'] = substr($table, ++$pos);
+    }
+    else {
+      $info['table'] = $table;
+    }
+    return $info;
+  }
+
+  /**
+   * Create names for indexes, primary keys and constraints.
+   *
+   * This prevents using {} around non-table names like indexes and keys.
+   */
+  public function prefixNonTable($table) {
+    $args = func_get_args();
+    $info = $this->getPrefixInfo($table);
+    $args[0] = $info['table'];
+    return implode('_', $args);
+  }
+
+  /**
+   * Build a condition to match a table name against a standard information_schema.
+   *
+   * The information_schema is a SQL standard that provides information about the
+   * database server and the databases, schemas, tables, columns and users within
+   * it. This makes information_schema a useful tool to use across the drupal
+   * database drivers and is used by a few different functions. The function below
+   * describes the conditions to be meet when querying information_schema.tables
+   * for drupal tables or information associated with drupal tables. Even though
+   * this is the standard method, not all databases follow standards and so this
+   * method should be overwritten by a database driver if the database provider
+   * uses alternate methods. Because information_schema.tables is used in a few
+   * different functions, a database driver will only need to override this function
+   * to make all the others work. For example see
+   * core/includes/databases/mysql/schema.inc.
+   *
+   * @param $table_name
+   *   The name of the table in question.
+   * @param $operator
+   *   The operator to apply on the 'table' part of the condition.
+   * @param $add_prefix
+   *   Boolean to indicate whether the table name needs to be prefixed.
+   *
+   * @return \Drupal\Core\Database\Query\Condition
+   *   A Condition object.
+   */
+  protected function buildTableNameCondition($table_name, $operator = '=', $add_prefix = TRUE) {
+    $info = $this->connection->getConnectionOptions();
+
+    // Retrieve the table name and schema
+    $table_info = $this->getPrefixInfo($table_name, $add_prefix);
+
+    $condition = new Condition('AND');
+    $condition->condition('table_catalog', $info['database']);
+    $condition->condition('table_schema', $table_info['schema']);
+    $condition->condition('table_name', $table_info['table'], $operator);
+    return $condition;
+  }
+
+  /**
+   * Check if a table exists.
+   *
+   * @param $table
+   *   The name of the table in drupal (no prefixing).
+   *
+   * @return
+   *   TRUE if the given table exists, otherwise FALSE.
+   */
+  public function tableExists($table) {
+    $condition = $this->buildTableNameCondition($table);
+    $condition->compile($this->connection, $this);
+    // Normally, we would heartily discourage the use of string
+    // concatenation for conditionals like this however, we
+    // couldn't use db_select() here because it would prefix
+    // information_schema.tables and the query would fail.
+    // Don't use {} around information_schema.tables table.
+    return (bool) $this->connection->query("SELECT 1 FROM information_schema.tables WHERE " . (string) $condition, $condition->arguments())->fetchField();
+  }
+
+  /**
+   * Finds all tables that are like the specified base table name.
+   *
+   * @param string $table_expression
+   *   An SQL expression, for example "cache_%" (without the quotes).
+   *
+   * @return array
+   *   Both the keys and the values are the matching tables.
+   */
+  public function findTables($table_expression) {
+    // Load all the tables up front in order to take into account per-table
+    // prefixes. The actual matching is done at the bottom of the method.
+    $condition = $this->buildTableNameCondition('%', 'LIKE');
+    $condition->compile($this->connection, $this);
+
+    $individually_prefixed_tables = $this->connection->getUnprefixedTablesMap();
+    $default_prefix = $this->connection->tablePrefix();
+    $default_prefix_length = strlen($default_prefix);
+    $tables = [];
+    // Normally, we would heartily discourage the use of string
+    // concatenation for conditionals like this however, we
+    // couldn't use db_select() here because it would prefix
+    // information_schema.tables and the query would fail.
+    // Don't use {} around information_schema.tables table.
+    $results = $this->connection->query("SELECT table_name FROM information_schema.tables WHERE " . (string) $condition, $condition->arguments());
+    foreach ($results as $table) {
+      // Take into account tables that have an individual prefix.
+      if (isset($individually_prefixed_tables[$table->table_name])) {
+        $prefix_length = strlen($this->connection->tablePrefix($individually_prefixed_tables[$table->table_name]));
+      }
+      elseif ($default_prefix && substr($table->table_name, 0, $default_prefix_length) !== $default_prefix) {
+        // This table name does not start the default prefix, which means that
+        // it is not managed by Drupal so it should be excluded from the result.
+        continue;
+      }
+      else {
+        $prefix_length = $default_prefix_length;
+      }
+
+      // Remove the prefix from the returned tables.
+      $unprefixed_table_name = substr($table->table_name, $prefix_length);
+
+      // The pattern can match a table which is the same as the prefix. That
+      // will become an empty string when we remove the prefix, which will
+      // probably surprise the caller, besides not being a prefixed table. So
+      // remove it.
+      if (!empty($unprefixed_table_name)) {
+        $tables[$unprefixed_table_name] = $unprefixed_table_name;
+      }
+    }
+
+    // Convert the table expression from its SQL LIKE syntax to a regular
+    // expression and escape the delimiter that will be used for matching.
+    $table_expression = str_replace(['%', '_'], ['.*?', '.'], preg_quote($table_expression, '/'));
+    $tables = preg_grep('/^' . $table_expression . '$/i', $tables);
+
+    return $tables;
+  }
+
+  /**
+   * Check if a column exists in the given table.
+   *
+   * @param $table
+   *   The name of the table in drupal (no prefixing).
+   * @param $name
+   *   The name of the column.
+   *
+   * @return
+   *   TRUE if the given column exists, otherwise FALSE.
+   */
+  public function fieldExists($table, $column) {
+    $condition = $this->buildTableNameCondition($table);
+    $condition->condition('column_name', $column);
+    $condition->compile($this->connection, $this);
+    // Normally, we would heartily discourage the use of string
+    // concatenation for conditionals like this however, we
+    // couldn't use db_select() here because it would prefix
+    // information_schema.tables and the query would fail.
+    // Don't use {} around information_schema.columns table.
+    return (bool) $this->connection->query("SELECT 1 FROM information_schema.columns WHERE " . (string) $condition, $condition->arguments())->fetchField();
+  }
+
+  /**
+   * Returns a mapping of Drupal schema field names to DB-native field types.
+   *
+   * Because different field types do not map 1:1 between databases, Drupal has
+   * its own normalized field type names. This function returns a driver-specific
+   * mapping table from Drupal names to the native names for each database.
+   *
+   * @return array
+   *   An array of Schema API field types to driver-specific field types.
+   */
+  abstract public function getFieldTypeMap();
+
+  /**
+   * Rename a table.
+   *
+   * @param $table
+   *   The table to be renamed.
+   * @param $new_name
+   *   The new name for the table.
+   *
+   * @throws \Drupal\Core\Database\SchemaObjectDoesNotExistException
+   *   If the specified table doesn't exist.
+   * @throws \Drupal\Core\Database\SchemaObjectExistsException
+   *   If a table with the specified new name already exists.
+   */
+  abstract public function renameTable($table, $new_name);
+
+  /**
+   * Drop a table.
+   *
+   * @param $table
+   *   The table to be dropped.
+   *
+   * @return
+   *   TRUE if the table was successfully dropped, FALSE if there was no table
+   *   by that name to begin with.
+   */
+  abstract public function dropTable($table);
+
+  /**
+   * Add a new field to a table.
+   *
+   * @param $table
+   *   Name of the table to be altered.
+   * @param $field
+   *   Name of the field to be added.
+   * @param $spec
+   *   The field specification array, as taken from a schema definition.
+   *   The specification may also contain the key 'initial', the newly
+   *   created field will be set to the value of the key in all rows.
+   *   This is most useful for creating NOT NULL columns with no default
+   *   value in existing tables.
+   *   Alternatively, the 'initial_form_field' key may be used, which will
+   *   auto-populate the new field with values from the specified field.
+   * @param $keys_new
+   *   (optional) Keys and indexes specification to be created on the
+   *   table along with adding the field. The format is the same as a
+   *   table specification but without the 'fields' element. If you are
+   *   adding a type 'serial' field, you MUST specify at least one key
+   *   or index including it in this array. See db_change_field() for more
+   *   explanation why.
+   *
+   * @throws \Drupal\Core\Database\SchemaObjectDoesNotExistException
+   *   If the specified table doesn't exist.
+   * @throws \Drupal\Core\Database\SchemaObjectExistsException
+   *   If the specified table already has a field by that name.
+   */
+  abstract public function addField($table, $field, $spec, $keys_new = []);
+
+  /**
+   * Drop a field.
+   *
+   * @param $table
+   *   The table to be altered.
+   * @param $field
+   *   The field to be dropped.
+   *
+   * @return
+   *   TRUE if the field was successfully dropped, FALSE if there was no field
+   *   by that name to begin with.
+   */
+  abstract public function dropField($table, $field);
+
+  /**
+   * Set the default value for a field.
+   *
+   * @param $table
+   *   The table to be altered.
+   * @param $field
+   *   The field to be altered.
+   * @param $default
+   *   Default value to be set. NULL for 'default NULL'.
+   *
+   * @throws \Drupal\Core\Database\SchemaObjectDoesNotExistException
+   *   If the specified table or field doesn't exist.
+   */
+  abstract public function fieldSetDefault($table, $field, $default);
+
+  /**
+   * Set a field to have no default value.
+   *
+   * @param $table
+   *   The table to be altered.
+   * @param $field
+   *   The field to be altered.
+   *
+   * @throws \Drupal\Core\Database\SchemaObjectDoesNotExistException
+   *   If the specified table or field doesn't exist.
+   */
+  abstract public function fieldSetNoDefault($table, $field);
+
+  /**
+   * Checks if an index exists in the given table.
+   *
+   * @param $table
+   *   The name of the table in drupal (no prefixing).
+   * @param $name
+   *   The name of the index in drupal (no prefixing).
+   *
+   * @return
+   *   TRUE if the given index exists, otherwise FALSE.
+   */
+  abstract public function indexExists($table, $name);
+
+  /**
+   * Add a primary key.
+   *
+   * @param $table
+   *   The table to be altered.
+   * @param $fields
+   *   Fields for the primary key.
+   *
+   * @throws \Drupal\Core\Database\SchemaObjectDoesNotExistException
+   *   If the specified table doesn't exist.
+   * @throws \Drupal\Core\Database\SchemaObjectExistsException
+   *   If the specified table already has a primary key.
+   */
+  abstract public function addPrimaryKey($table, $fields);
+
+  /**
+   * Drop the primary key.
+   *
+   * @param $table
+   *   The table to be altered.
+   *
+   * @return
+   *   TRUE if the primary key was successfully dropped, FALSE if there was no
+   *   primary key on this table to begin with.
+   */
+  abstract public function dropPrimaryKey($table);
+
+  /**
+   * Add a unique key.
+   *
+   * @param $table
+   *   The table to be altered.
+   * @param $name
+   *   The name of the key.
+   * @param $fields
+   *   An array of field names.
+   *
+   * @throws \Drupal\Core\Database\SchemaObjectDoesNotExistException
+   *   If the specified table doesn't exist.
+   * @throws \Drupal\Core\Database\SchemaObjectExistsException
+   *   If the specified table already has a key by that name.
+   */
+  abstract public function addUniqueKey($table, $name, $fields);
+
+  /**
+   * Drop a unique key.
+   *
+   * @param $table
+   *   The table to be altered.
+   * @param $name
+   *   The name of the key.
+   *
+   * @return
+   *   TRUE if the key was successfully dropped, FALSE if there was no key by
+   *   that name to begin with.
+   */
+  abstract public function dropUniqueKey($table, $name);
+
+  /**
+   * Add an index.
+   *
+   * @param $table
+   *   The table to be altered.
+   * @param $name
+   *   The name of the index.
+   * @param $fields
+   *   An array of field names or field information; if field information is
+   *   passed, it's an array whose first element is the field name and whose
+   *   second is the maximum length in the index. For example, the following
+   *   will use the full length of the `foo` field, but limit the `bar` field to
+   *   4 characters:
+   *   @code
+   *     $fields = ['foo', ['bar', 4]];
+   *   @endcode
+   * @param array $spec
+   *   The table specification for the table to be altered. This is used in
+   *   order to be able to ensure that the index length is not too long.
+   *   This schema definition can usually be obtained through hook_schema(), or
+   *   in case the table was created by the Entity API, through the schema
+   *   handler listed in the entity class definition. For reference, see
+   *   SqlContentEntityStorageSchema::getDedicatedTableSchema() and
+   *   SqlContentEntityStorageSchema::getSharedTableFieldSchema().
+   *
+   *   In order to prevent human error, it is recommended to pass in the
+   *   complete table specification. However, in the edge case of the complete
+   *   table specification not being available, we can pass in a partial table
+   *   definition containing only the fields that apply to the index:
+   *   @code
+   *   $spec = [
+   *     // Example partial specification for a table:
+   *     'fields' => [
+   *       'example_field' => [
+   *         'description' => 'An example field',
+   *         'type' => 'varchar',
+   *         'length' => 32,
+   *         'not null' => TRUE,
+   *         'default' => '',
+   *       ],
+   *     ],
+   *     'indexes' => [
+   *       'table_example_field' => ['example_field'],
+   *     ],
+   *   ];
+   *   @endcode
+   *   Note that the above is a partial table definition and that we would
+   *   usually pass a complete table definition as obtained through
+   *   hook_schema() instead.
+   *
+   * @see schemaapi
+   * @see hook_schema()
+   *
+   * @throws \Drupal\Core\Database\SchemaObjectDoesNotExistException
+   *   If the specified table doesn't exist.
+   * @throws \Drupal\Core\Database\SchemaObjectExistsException
+   *   If the specified table already has an index by that name.
+   *
+   * @todo remove the $spec argument whenever schema introspection is added.
+   */
+  abstract public function addIndex($table, $name, $fields, array $spec);
+
+  /**
+   * Drop an index.
+   *
+   * @param $table
+   *   The table to be altered.
+   * @param $name
+   *   The name of the index.
+   *
+   * @return
+   *   TRUE if the index was successfully dropped, FALSE if there was no index
+   *   by that name to begin with.
+   */
+  abstract public function dropIndex($table, $name);
+
+  /**
+   * Change a field definition.
+   *
+   * IMPORTANT NOTE: To maintain database portability, you have to explicitly
+   * recreate all indices and primary keys that are using the changed field.
+   *
+   * That means that you have to drop all affected keys and indexes with
+   * db_drop_{primary_key,unique_key,index}() before calling db_change_field().
+   * To recreate the keys and indices, pass the key definitions as the
+   * optional $keys_new argument directly to db_change_field().
+   *
+   * For example, suppose you have:
+   * @code
+   * $schema['foo'] = array(
+   *   'fields' => array(
+   *     'bar' => array('type' => 'int', 'not null' => TRUE)
+   *   ),
+   *   'primary key' => array('bar')
+   * );
+   * @endcode
+   * and you want to change foo.bar to be type serial, leaving it as the
+   * primary key. The correct sequence is:
+   * @code
+   * db_drop_primary_key('foo');
+   * db_change_field('foo', 'bar', 'bar',
+   *   array('type' => 'serial', 'not null' => TRUE),
+   *   array('primary key' => array('bar')));
+   * @endcode
+   *
+   * The reasons for this are due to the different database engines:
+   *
+   * On PostgreSQL, changing a field definition involves adding a new field
+   * and dropping an old one which* causes any indices, primary keys and
+   * sequences (from serial-type fields) that use the changed field to be dropped.
+   *
+   * On MySQL, all type 'serial' fields must be part of at least one key
+   * or index as soon as they are created. You cannot use
+   * db_add_{primary_key,unique_key,index}() for this purpose because
+   * the ALTER TABLE command will fail to add the column without a key
+   * or index specification. The solution is to use the optional
+   * $keys_new argument to create the key or index at the same time as
+   * field.
+   *
+   * You could use db_add_{primary_key,unique_key,index}() in all cases
+   * unless you are converting a field to be type serial. You can use
+   * the $keys_new argument in all cases.
+   *
+   * @param $table
+   *   Name of the table.
+   * @param $field
+   *   Name of the field to change.
+   * @param $field_new
+   *   New name for the field (set to the same as $field if you don't want to change the name).
+   * @param $spec
+   *   The field specification for the new field.
+   * @param $keys_new
+   *   (optional) Keys and indexes specification to be created on the
+   *   table along with changing the field. The format is the same as a
+   *   table specification but without the 'fields' element.
+   *
+   * @throws \Drupal\Core\Database\SchemaObjectDoesNotExistException
+   *   If the specified table or source field doesn't exist.
+   * @throws \Drupal\Core\Database\SchemaObjectExistsException
+   *   If the specified destination field already exists.
+   */
+  abstract public function changeField($table, $field, $field_new, $spec, $keys_new = []);
+
+  /**
+   * Create a new table from a Drupal table definition.
+   *
+   * @param $name
+   *   The name of the table to create.
+   * @param $table
+   *   A Schema API table definition array.
+   *
+   * @throws \Drupal\Core\Database\SchemaObjectExistsException
+   *   If the specified table already exists.
+   */
+  public function createTable($name, $table) {
+    if ($this->tableExists($name)) {
+      throw new SchemaObjectExistsException(t('Table @name already exists.', ['@name' => $name]));
+    }
+    $statements = $this->createTableSql($name, $table);
+    foreach ($statements as $statement) {
+      $this->connection->query($statement);
+    }
+  }
+
+  /**
+   * Return an array of field names from an array of key/index column specifiers.
+   *
+   * This is usually an identity function but if a key/index uses a column prefix
+   * specification, this function extracts just the name.
+   *
+   * @param $fields
+   *   An array of key/index column specifiers.
+   *
+   * @return
+   *   An array of field names.
+   */
+  public function fieldNames($fields) {
+    $return = [];
+    foreach ($fields as $field) {
+      if (is_array($field)) {
+        $return[] = $field[0];
+      }
+      else {
+        $return[] = $field;
+      }
+    }
+    return $return;
+  }
+
+  /**
+   * Prepare a table or column comment for database query.
+   *
+   * @param $comment
+   *   The comment string to prepare.
+   * @param $length
+   *   Optional upper limit on the returned string length.
+   *
+   * @return
+   *   The prepared comment.
+   */
+  public function prepareComment($comment, $length = NULL) {
+    // Remove semicolons to avoid triggering multi-statement check.
+    $comment = strtr($comment, [';' => '.']);
+    return $this->connection->quote($comment);
+  }
+
+  /**
+   * Return an escaped version of its parameter to be used as a default value
+   * on a column.
+   *
+   * @param mixed $value
+   *   The value to be escaped (int, float, null or string).
+   *
+   * @return string|int|float
+   *   The escaped value.
+   */
+  protected function escapeDefaultValue($value) {
+    if (is_null($value)) {
+      return 'NULL';
+    }
+    return is_string($value) ? $this->connection->quote($value) : $value;
+  }
+
+}