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Name	Size	Permission
mysql	[ DIR ]	drwxr-xr-x
pgsql	[ DIR ]	drwxr-xr-x
sqlite	[ DIR ]	drwxr-xr-x
database.inc	93.67 KB	-rw-r--r--
log.inc	4.76 KB	-rw-r--r--
prefetch.inc	13.66 KB	-rw-r--r--
query.inc	56.08 KB	-rw-r--r--
schema.inc	26.45 KB	-rw-r--r--
select.inc	48.71 KB	-rw-r--r--

Code Editor : query.inc

<?php

/**
 * @addtogroup database
 * @{
 */

/**
 * @file
 * Non-specific Database query code. Used by all engines.
 */

/**
 * Interface for a conditional clause in a query.
 */
interface QueryConditionInterface {

/**
   * Helper function: builds the most common conditional clauses.
   *
   * This method can take a variable number of parameters. If called with two
   * parameters, they are taken as $field and $value with $operator having a
   * value of IN if $value is an array and = otherwise.
   *
   * Do not use this method to test for NULL values. Instead, use
   * QueryConditionInterface::isNull() or QueryConditionInterface::isNotNull().
   *
   * @param $field
   *   The name of the field to check. If you would like to add a more complex
   *   condition involving operators or functions, use where().
   * @param $value
   *   The value to test the field against. In most cases, this is a scalar.
   *   For more complex options, it is an array. The meaning of each element in
   *   the array is dependent on the $operator.
   * @param $operator
   *   The comparison operator, such as =, <, or >=. It also accepts more
   *   complex options such as IN, LIKE, or BETWEEN. Defaults to IN if $value is
   *   an array, and = otherwise.
   *
   * @return QueryConditionInterface
   *   The called object.
   *
   * @see QueryConditionInterface::isNull()
   * @see QueryConditionInterface::isNotNull()
   */
  public function condition($field, $value = NULL, $operator = NULL);

/**
   * Adds an arbitrary WHERE clause to the query.
   *
   * @param $snippet
   *   A portion of a WHERE clause as a prepared statement. It must use named
   *   placeholders, not ? placeholders.
   * @param $args
   *   An associative array of arguments.
   *
   * @return QueryConditionInterface
   *   The called object.
   */
  public function where($snippet, $args = array());

/**
   * Sets a condition that the specified field be NULL.
   *
   * @param $field
   *   The name of the field to check.
   *
   * @return QueryConditionInterface
   *   The called object.
   */
  public function isNull($field);

/**
   * Sets a condition that the specified field be NOT NULL.
   *
   * @param $field
   *   The name of the field to check.
   *
   * @return QueryConditionInterface
   *   The called object.
   */
  public function isNotNull($field);

/**
   * Sets a condition that the specified subquery returns values.
   *
   * @param SelectQueryInterface $select
   *   The subquery that must contain results.
   *
   * @return QueryConditionInterface
   *   The called object.
   */
  public function exists(SelectQueryInterface $select);

/**
   * Sets a condition that the specified subquery returns no values.
   *
   * @param SelectQueryInterface $select
   *   The subquery that must not contain results.
   *
   * @return QueryConditionInterface
   *   The called object.
   */
  public function notExists(SelectQueryInterface $select);

/**
   * Gets a complete list of all conditions in this conditional clause.
   *
   * This method returns by reference. That allows alter hooks to access the
   * data structure directly and manipulate it before it gets compiled.
   *
   * The data structure that is returned is an indexed array of entries, where
   * each entry looks like the following:
   * @code
   * array(
   *   'field' => $field,
   *   'value' => $value,
   *   'operator' => $operator,
   * );
   * @endcode
   *
   * In the special case that $operator is NULL, the $field is taken as a raw
   * SQL snippet (possibly containing a function) and $value is an associative
   * array of placeholders for the snippet.
   *
   * There will also be a single array entry of #conjunction, which is the
   * conjunction that will be applied to the array, such as AND.
   */
  public function &conditions();

/**
   * Gets a complete list of all values to insert into the prepared statement.
   *
   * @return
   *   An associative array of placeholders and values.
   */
  public function arguments();

/**
   * Compiles the saved conditions for later retrieval.
   *
   * This method does not return anything, but simply prepares data to be
   * retrieved via __toString() and arguments().
   *
   * @param $connection
   *   The database connection for which to compile the conditionals.
   * @param $queryPlaceholder
   *   The query this condition belongs to. If not given, the current query is
   *   used.
   */
  public function compile(DatabaseConnection $connection, QueryPlaceholderInterface $queryPlaceholder);

/**
   * Check whether a condition has been previously compiled.
   *
   * @return
   *   TRUE if the condition has been previously compiled.
   */
  public function compiled();
}

/**
 * Interface for a query that can be manipulated via an alter hook.
 */
interface QueryAlterableInterface {

/**
   * Adds a tag to a query.
   *
   * Tags are strings that identify a query. A query may have any number of
   * tags. Tags are used to mark a query so that alter hooks may decide if they
   * wish to take action. Tags should be all lower-case and contain only
   * letters, numbers, and underscore, and start with a letter. That is, they
   * should follow the same rules as PHP identifiers in general.
   *
   * @param $tag
   *   The tag to add.
   *
   * @return QueryAlterableInterface
   *   The called object.
   */
  public function addTag($tag);

/**
   * Determines if a given query has a given tag.
   *
   * @param $tag
   *   The tag to check.
   *
   * @return
   *   TRUE if this query has been marked with this tag, FALSE otherwise.
   */
  public function hasTag($tag);

/**
   * Determines if a given query has all specified tags.
   *
   * @param $tags
   *   A variable number of arguments, one for each tag to check.
   *
   * @return
   *   TRUE if this query has been marked with all specified tags, FALSE
   *   otherwise.
   */
  public function hasAllTags();

/**
   * Determines if a given query has any specified tag.
   *
   * @param $tags
   *   A variable number of arguments, one for each tag to check.
   *
   * @return
   *   TRUE if this query has been marked with at least one of the specified
   *   tags, FALSE otherwise.
   */
  public function hasAnyTag();

/**
   * Adds additional metadata to the query.
   *
   * Often, a query may need to provide additional contextual data to alter
   * hooks. Alter hooks may then use that information to decide if and how
   * to take action.
   *
   * @param $key
   *   The unique identifier for this piece of metadata. Must be a string that
   *   follows the same rules as any other PHP identifier.
   * @param $object
   *   The additional data to add to the query. May be any valid PHP variable.
   *
   * @return QueryAlterableInterface
   *   The called object.
   */
  public function addMetaData($key, $object);

/**
   * Retrieves a given piece of metadata.
   *
   * @param $key
   *   The unique identifier for the piece of metadata to retrieve.
   *
   * @return
   *   The previously attached metadata object, or NULL if one doesn't exist.
   */
  public function getMetaData($key);
}

/**
 * Interface for a query that accepts placeholders.
 */
interface QueryPlaceholderInterface {

/**
   * Returns a unique identifier for this object.
   */
  public function uniqueIdentifier();

/**
   * Returns the next placeholder ID for the query.
   *
   * @return
   *   The next available placeholder ID as an integer.
   */
  public function nextPlaceholder();
}

/**
 * Base class for query builders.
 *
 * Note that query builders use PHP's magic __toString() method to compile the
 * query object into a prepared statement.
 */
abstract class Query implements QueryPlaceholderInterface {

/**
   * The connection object on which to run this query.
   *
   * @var DatabaseConnection
   */
  protected $connection;

/**
   * The target of the connection object.
   *
   * @var string
   */
  protected $connectionTarget;

/**
   * The key of the connection object.
   *
   * @var string
   */
  protected $connectionKey;

/**
   * The query options to pass on to the connection object.
   *
   * @var array
   */
  protected $queryOptions;

/**
   * A unique identifier for this query object.
   */
  protected $uniqueIdentifier;

/**
   * The placeholder counter.
   */
  protected $nextPlaceholder = 0;

/**
   * An array of comments that can be prepended to a query.
   *
   * @var array
   */
  protected $comments = array();

/**
   * Constructs a Query object.
   *
   * @param DatabaseConnection $connection
   *   Database connection object.
   * @param array $options
   *   Array of query options.
   */
  public function __construct(DatabaseConnection $connection, $options) {
    $this->uniqueIdentifier = uniqid('', TRUE);

$this->connection = $connection;
    $this->connectionKey = $this->connection->getKey();
    $this->connectionTarget = $this->connection->getTarget();

$this->queryOptions = $options;
  }

/**
   * Implements the magic __sleep function to disconnect from the database.
   */
  public function __sleep() {
    $keys = get_object_vars($this);
    unset($keys['connection']);
    return array_keys($keys);
  }

/**
   * Implements the magic __wakeup function to reconnect to the database.
   */
  public function __wakeup() {
    $this->connection = Database::getConnection($this->connectionTarget, $this->connectionKey);
  }

/**
   * Implements the magic __clone function.
   */
  public function __clone() {
    $this->uniqueIdentifier = uniqid('', TRUE);
  }

/**
   * Runs the query against the database.
   */
  abstract protected function execute();

/**
   * Implements PHP magic __toString method to convert the query to a string.
   *
   * The toString operation is how we compile a query object to a prepared
   * statement.
   *
   * @return
   *   A prepared statement query string for this object.
   */
  abstract public function __toString();

/**
   * Returns a unique identifier for this object.
   */
  public function uniqueIdentifier() {
    return $this->uniqueIdentifier;
  }

/**
   * Gets the next placeholder value for this query object.
   *
   * @return int
   *   Next placeholder value.
   */
  public function nextPlaceholder() {
    return $this->nextPlaceholder++;
  }

/**
   * Adds a comment to the query.
   *
   * By adding a comment to a query, you can more easily find it in your
   * query log or the list of active queries on an SQL server. This allows
   * for easier debugging and allows you to more easily find where a query
   * with a performance problem is being generated.
   *
   * The comment string will be sanitized to remove * / and other characters
   * that may terminate the string early so as to avoid SQL injection attacks.
   *
   * @param $comment
   *   The comment string to be inserted into the query.
   *
   * @return Query
   *   The called object.
   */
  public function comment($comment) {
    $this->comments[] = $comment;
    return $this;
  }

/**
   * Returns a reference to the comments array for the query.
   *
   * Because this method returns by reference, alter hooks may edit the comments
   * array directly to make their changes. If just adding comments, however, the
   * use of comment() is preferred.
   *
   * Note that this method must be called by reference as well:
   * @code
   * $comments =& $query->getComments();
   * @endcode
   *
   * @return
   *   A reference to the comments array structure.
   */
  public function &getComments() {
    return $this->comments;
  }
}

/**
 * General class for an abstracted INSERT query.
 */
class InsertQuery extends Query {

/**
   * The table on which to insert.
   *
   * @var string
   */
  protected $table;

/**
   * An array of fields on which to insert.
   *
   * @var array
   */
  protected $insertFields = array();

/**
   * An array of fields that should be set to their database-defined defaults.
   *
   * @var array
   */
  protected $defaultFields = array();

/**
   * A nested array of values to insert.
   *
   * $insertValues is an array of arrays. Each sub-array is either an
   * associative array whose keys are field names and whose values are field
   * values to insert, or a non-associative array of values in the same order
   * as $insertFields.
   *
   * Whether multiple insert sets will be run in a single query or multiple
   * queries is left to individual drivers to implement in whatever manner is
   * most appropriate. The order of values in each sub-array must match the
   * order of fields in $insertFields.
   *
   * @var array
   */
  protected $insertValues = array();

/**
   * A SelectQuery object to fetch the rows that should be inserted.
   *
   * @var SelectQueryInterface
   */
  protected $fromQuery;

/**
   * Constructs an InsertQuery object.
   *
   * @param DatabaseConnection $connection
   *   A DatabaseConnection object.
   * @param string $table
   *   Name of the table to associate with this query.
   * @param array $options
   *   Array of database options.
   */
  public function __construct($connection, $table, array $options = array()) {
    if (!isset($options['return'])) {
      $options['return'] = Database::RETURN_INSERT_ID;
    }
    parent::__construct($connection, $options);
    $this->table = $table;
  }

/**
   * Adds a set of field->value pairs to be inserted.
   *
   * This method may only be called once. Calling it a second time will be
   * ignored. To queue up multiple sets of values to be inserted at once,
   * use the values() method.
   *
   * @param $fields
   *   An array of fields on which to insert. This array may be indexed or
   *   associative. If indexed, the array is taken to be the list of fields.
   *   If associative, the keys of the array are taken to be the fields and
   *   the values are taken to be corresponding values to insert. If a
   *   $values argument is provided, $fields must be indexed.
   * @param $values
   *   An array of fields to insert into the database. The values must be
   *   specified in the same order as the $fields array.
   *
   * @return InsertQuery
   *   The called object.
   */
  public function fields(array $fields, array $values = array()) {
    if (empty($this->insertFields)) {
      if (empty($values)) {
        if (!is_numeric(key($fields))) {
          $values = array_values($fields);
          $fields = array_keys($fields);
        }
      }
      $this->insertFields = $fields;
      if (!empty($values)) {
        $this->insertValues[] = $values;
      }
    }

return $this;
  }

/**
   * Adds another set of values to the query to be inserted.
   *
   * If $values is a numeric-keyed array, it will be assumed to be in the same
   * order as the original fields() call. If it is associative, it may be
   * in any order as long as the keys of the array match the names of the
   * fields.
   *
   * @param $values
   *   An array of values to add to the query.
   *
   * @return InsertQuery
   *   The called object.
   */
  public function values(array $values) {
    if (is_numeric(key($values))) {
      $this->insertValues[] = $values;
    }
    else {
      // Reorder the submitted values to match the fields array.
      foreach ($this->insertFields as $key) {
        $insert_values[$key] = $values[$key];
      }
      // For consistency, the values array is always numerically indexed.
      $this->insertValues[] = array_values($insert_values);
    }
    return $this;
  }

/**
   * Specifies fields for which the database defaults should be used.
   *
   * If you want to force a given field to use the database-defined default,
   * not NULL or undefined, use this method to instruct the database to use
   * default values explicitly. In most cases this will not be necessary
   * unless you are inserting a row that is all default values, as you cannot
   * specify no values in an INSERT query.
   *
   * Specifying a field both in fields() and in useDefaults() is an error
   * and will not execute.
   *
   * @param $fields
   *   An array of values for which to use the default values
   *   specified in the table definition.
   *
   * @return InsertQuery
   *   The called object.
   */
  public function useDefaults(array $fields) {
    $this->defaultFields = $fields;
    return $this;
  }

/**
   * Sets the fromQuery on this InsertQuery object.
   *
   * @param SelectQueryInterface $query
   *   The query to fetch the rows that should be inserted.
   *
   * @return InsertQuery
   *   The called object.
   */
  public function from(SelectQueryInterface $query) {
    $this->fromQuery = $query;
    return $this;
  }

/**
   * Executes the insert query.
   *
   * @return
   *   The last insert ID of the query, if one exists. If the query
   *   was given multiple sets of values to insert, the return value is
   *   undefined. If no fields are specified, this method will do nothing and
   *   return NULL. That makes it safe to use in multi-insert loops.
   */
  public function execute() {
    // If validation fails, simply return NULL. Note that validation routines
    // in preExecute() may throw exceptions instead.
    if (!$this->preExecute()) {
      return NULL;
    }

// If we're selecting from a SelectQuery, finish building the query and
    // pass it back, as any remaining options are irrelevant.
    if (!empty($this->fromQuery)) {
      $sql = (string) $this;
      // The SelectQuery may contain arguments, load and pass them through.
      return $this->connection->query($sql, $this->fromQuery->getArguments(), $this->queryOptions);
    }

$last_insert_id = 0;

// Each insert happens in its own query in the degenerate case. However,
    // we wrap it in a transaction so that it is atomic where possible. On many
    // databases, such as SQLite, this is also a notable performance boost.
    $transaction = $this->connection->startTransaction();

try {
      $sql = (string) $this;
      foreach ($this->insertValues as $insert_values) {
        $last_insert_id = $this->connection->query($sql, $insert_values, $this->queryOptions);
      }
    }
    catch (Exception $e) {
      // One of the INSERTs failed, rollback the whole batch.
      $transaction->rollback();
      // Rethrow the exception for the calling code.
      throw $e;
    }

// Re-initialize the values array so that we can re-use this query.
    $this->insertValues = array();

// Transaction commits here where $transaction looses scope.

return $last_insert_id;
  }

/**
   * Implements PHP magic __toString method to convert the query to a string.
   *
   * @return string
   *   The prepared statement.
   */
  public function __toString() {
    // Create a sanitized comment string to prepend to the query.
    $comments = $this->connection->makeComment($this->comments);

// Default fields are always placed first for consistency.
    $insert_fields = array_merge($this->defaultFields, $this->insertFields);

if (!empty($this->fromQuery)) {
      return $comments . 'INSERT INTO {' . $this->table . '} (' . implode(', ', $insert_fields) . ') ' . $this->fromQuery;
    }

// For simplicity, we will use the $placeholders array to inject
    // default keywords even though they are not, strictly speaking,
    // placeholders for prepared statements.
    $placeholders = array();
    $placeholders = array_pad($placeholders, count($this->defaultFields), 'default');
    $placeholders = array_pad($placeholders, count($this->insertFields), '?');

return $comments . 'INSERT INTO {' . $this->table . '} (' . implode(', ', $insert_fields) . ') VALUES (' . implode(', ', $placeholders) . ')';
  }

/**
   * Preprocesses and validates the query.
   *
   * @return
   *   TRUE if the validation was successful, FALSE if not.
   *
   * @throws FieldsOverlapException
   * @throws NoFieldsException
   */
  public function preExecute() {
    // Confirm that the user did not try to specify an identical
    // field and default field.
    if (array_intersect($this->insertFields, $this->defaultFields)) {
      throw new FieldsOverlapException('You may not specify the same field to have a value and a schema-default value.');
    }

if (!empty($this->fromQuery)) {
      // We have to assume that the used aliases match the insert fields.
      // Regular fields are added to the query before expressions, maintain the
      // same order for the insert fields.
      // This behavior can be overridden by calling fields() manually as only the
      // first call to fields() does have an effect.
      $this->fields(array_merge(array_keys($this->fromQuery->getFields()), array_keys($this->fromQuery->getExpressions())));
    }
    else {
      // Don't execute query without fields.
      if (count($this->insertFields) + count($this->defaultFields) == 0) {
        throw new NoFieldsException('There are no fields available to insert with.');
      }
    }

// If no values have been added, silently ignore this query. This can happen
    // if values are added conditionally, so we don't want to throw an
    // exception.
    if (!isset($this->insertValues[0]) && count($this->insertFields) > 0 && empty($this->fromQuery)) {
      return FALSE;
    }
    return TRUE;
  }
}

/**
 * General class for an abstracted DELETE operation.
 */
class DeleteQuery extends Query implements QueryConditionInterface {

/**
   * The table from which to delete.
   *
   * @var string
   */
  protected $table;

/**
   * The condition object for this query.
   *
   * Condition handling is handled via composition.
   *
   * @var DatabaseCondition
   */
  protected $condition;

/**
   * Constructs a DeleteQuery object.
   *
   * @param DatabaseConnection $connection
   *   A DatabaseConnection object.
   * @param string $table
   *   Name of the table to associate with this query.
   * @param array $options
   *   Array of database options.
   */
  public function __construct(DatabaseConnection $connection, $table, array $options = array()) {
    $options['return'] = Database::RETURN_AFFECTED;
    parent::__construct($connection, $options);
    $this->table = $table;

$this->condition = new DatabaseCondition('AND');
  }

/**
   * Implements QueryConditionInterface::condition().
   */
  public function condition($field, $value = NULL, $operator = NULL) {
    $this->condition->condition($field, $value, $operator);
    return $this;
  }

/**
   * Implements QueryConditionInterface::isNull().
   */
  public function isNull($field) {
    $this->condition->isNull($field);
    return $this;
  }

/**
   * Implements QueryConditionInterface::isNotNull().
   */
  public function isNotNull($field) {
    $this->condition->isNotNull($field);
    return $this;
  }

/**
   * Implements QueryConditionInterface::exists().
   */
  public function exists(SelectQueryInterface $select) {
    $this->condition->exists($select);
    return $this;
  }

/**
   * Implements QueryConditionInterface::notExists().
   */
  public function notExists(SelectQueryInterface $select) {
    $this->condition->notExists($select);
    return $this;
  }

/**
   * Implements QueryConditionInterface::conditions().
   */
  public function &conditions() {
    return $this->condition->conditions();
  }

/**
   * Implements QueryConditionInterface::arguments().
   */
  public function arguments() {
    return $this->condition->arguments();
  }

/**
   * Implements QueryConditionInterface::where().
   */
  public function where($snippet, $args = array()) {
    $this->condition->where($snippet, $args);
    return $this;
  }

/**
   * Implements QueryConditionInterface::compile().
   */
  public function compile(DatabaseConnection $connection, QueryPlaceholderInterface $queryPlaceholder) {
    return $this->condition->compile($connection, $queryPlaceholder);
  }

/**
   * Implements QueryConditionInterface::compiled().
   */
  public function compiled() {
    return $this->condition->compiled();
  }

/**
   * Executes the DELETE query.
   *
   * @return
   *   The return value is dependent on the database connection.
   */
  public function execute() {
    $values = array();
    if (count($this->condition)) {
      $this->condition->compile($this->connection, $this);
      $values = $this->condition->arguments();
    }

return $this->connection->query((string) $this, $values, $this->queryOptions);
  }

$query = $comments . 'DELETE FROM {' . $this->connection->escapeTable($this->table) . '} ';

if (count($this->condition)) {

$this->condition->compile($this->connection, $this);
      $query .= "\nWHERE " . $this->condition;
    }

return $query;
  }
}

/**
 * General class for an abstracted TRUNCATE operation.
 */
class TruncateQuery extends Query {

/**
   * The table to truncate.
   *
   * @var string
   */
  protected $table;

/**
   * Constructs a TruncateQuery object.
   *
   * @param DatabaseConnection $connection
   *   A DatabaseConnection object.
   * @param string $table
   *   Name of the table to associate with this query.
   * @param array $options
   *   Array of database options.
   */
  public function __construct(DatabaseConnection $connection, $table, array $options = array()) {
    $options['return'] = Database::RETURN_AFFECTED;
    parent::__construct($connection, $options);
    $this->table = $table;
  }

/**
   * Implements QueryConditionInterface::compiled().
   */
  public function compiled() {
    return $this->condition->compiled();
  }

/**
   * Executes the TRUNCATE query.
   *
   * @return
   *   Return value is dependent on the database type.
   */
  public function execute() {
    return $this->connection->query((string) $this, array(), $this->queryOptions);
  }

// In most cases, TRUNCATE is not a transaction safe statement as it is a
    // DDL statement which results in an implicit COMMIT. When we are in a
    // transaction, fallback to the slower, but transactional, DELETE.
    // PostgreSQL also locks the entire table for a TRUNCATE strongly reducing
    // the concurrency with other transactions.
    if ($this->connection->inTransaction()) {
      return $comments . 'DELETE FROM {' . $this->connection->escapeTable($this->table) . '}';
    }
    else {
      return $comments . 'TRUNCATE {' . $this->connection->escapeTable($this->table) . '} ';
    }
  }
}

/**
 * General class for an abstracted UPDATE operation.
 */
class UpdateQuery extends Query implements QueryConditionInterface {

/**
   * The table to update.
   *
   * @var string
   */
  protected $table;

/**
   * An array of fields that will be updated.
   *
   * @var array
   */
  protected $fields = array();

/**
   * An array of values to update to.
   *
   * @var array
   */
  protected $arguments = array();

/**
   * The condition object for this query.
   *
   * Condition handling is handled via composition.
   *
   * @var DatabaseCondition
   */
  protected $condition;

/**
   * Array of fields to update to an expression in case of a duplicate record.
   *
   * This variable is a nested array in the following format:
   * @code
   * <some field> => array(
   *  'condition' => <condition to execute, as a string>,
   *  'arguments' => <array of arguments for condition, or NULL for none>,
   * );
   * @endcode
   *
   * @var array
   */
  protected $expressionFields = array();

/**
   * Constructs an UpdateQuery object.
   *
   * @param DatabaseConnection $connection
   *   A DatabaseConnection object.
   * @param string $table
   *   Name of the table to associate with this query.
   * @param array $options
   *   Array of database options.
   */
  public function __construct(DatabaseConnection $connection, $table, array $options = array()) {
    $options['return'] = Database::RETURN_AFFECTED;
    parent::__construct($connection, $options);
    $this->table = $table;