public function Schema::tableExists in Drupal 8

Same name in this branch

1. 8 core/lib/Drupal/Core/Database/Schema.php \Drupal\Core\Database\Schema::tableExists()
2. 8 core/lib/Drupal/Core/Database/Driver/sqlite/Schema.php \Drupal\Core\Database\Driver\sqlite\Schema::tableExists()
3. 8 core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php \Drupal\Core\Database\Driver\pgsql\Schema::tableExists()
4. 8 core/lib/Drupal/Core/Database/Driver/mysql/Schema.php \Drupal\Core\Database\Driver\mysql\Schema::tableExists()

Same name and namespace in other branches

1. 9 core/lib/Drupal/Core/Database/Driver/mysql/Schema.php \Drupal\Core\Database\Driver\mysql\Schema::tableExists()

Check if a table exists.

Parameters

$table: The name of the table in drupal (no prefixing).

Return value

TRUE if the given table exists, otherwise FALSE.

Overrides Schema::tableExists

8 calls to Schema::tableExists()

Schema::addField in core/lib/Drupal/Core/Database/Driver/mysql/Schema.php

Add a new field to a table.

Schema::addIndex in core/lib/Drupal/Core/Database/Driver/mysql/Schema.php

Add an index.

Schema::addPrimaryKey in core/lib/Drupal/Core/Database/Driver/mysql/Schema.php

Add a primary key.

Schema::addUniqueKey in core/lib/Drupal/Core/Database/Driver/mysql/Schema.php

Add a unique key.

Schema::dropTable in core/lib/Drupal/Core/Database/Driver/mysql/Schema.php

Drop a table.

... See full list

File

core/lib/Drupal/Core/Database/Driver/mysql/Schema.php, line 701

Class

Schema

MySQL implementation of \Drupal\Core\Database\Schema.

Namespace

Drupal\Core\Database\Driver\mysql

Code

public function tableExists($table) {

  // The information_schema table is very slow to query under MySQL 5.0.
  // Instead, we try to select from the table in question.  If it fails,
  // the most likely reason is that it does not exist. That is dramatically
  // faster than using information_schema.
  // @link http://bugs.mysql.com/bug.php?id=19588
  // @todo This override should be removed once we require a version of MySQL
  //   that has that bug fixed.
  try {
    $this->connection
      ->queryRange("SELECT 1 FROM {" . $table . "}", 0, 1);
    return TRUE;
  } catch (\Exception $e) {
    return FALSE;
  }
}