public function Schema::fieldExists in Drupal 9

Same name in this branch

1. 9 core/lib/Drupal/Core/Database/Schema.php \Drupal\Core\Database\Schema::fieldExists()
2. 9 core/lib/Drupal/Core/Database/Driver/sqlite/Schema.php \Drupal\Core\Database\Driver\sqlite\Schema::fieldExists()
3. 9 core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php \Drupal\Core\Database\Driver\pgsql\Schema::fieldExists()
4. 9 core/lib/Drupal/Core/Database/Driver/mysql/Schema.php \Drupal\Core\Database\Driver\mysql\Schema::fieldExists()

Same name and namespace in other branches

1. 8 core/lib/Drupal/Core/Database/Driver/mysql/Schema.php \Drupal\Core\Database\Driver\mysql\Schema::fieldExists()

Check if a column exists in the given table.

Parameters

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

string $column: The name of the column.

Return value

TRUE if the given column exists, otherwise FALSE.

Overrides Schema::fieldExists

3 calls to Schema::fieldExists()

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

Add a new field to a table.

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

Change a field definition.

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

Drop a field.

File

core/lib/Drupal/Core/Database/Driver/mysql/Schema.php, line 694

Class

Schema

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

Namespace

Drupal\Core\Database\Driver\mysql

Code

public function fieldExists($table, $column) {

  // The information_schema table is very slow to query under MySQL 5.0.
  // Instead, we try to select from the table and field 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 {
    $this->connection
      ->queryRange("SELECT {$column} FROM {" . $table . "}", 0, 1);
    return TRUE;
  } catch (\Exception $e) {
    return FALSE;
  }
}