# MongoDB\Driver\ClientEncryption::getKeyByAltName

(mongodb >=1.15.0)

MongoDB\Driver\ClientEncryption::getKeyByAltName — Gets a key document by an alternate name

### 说明

final public MongoDB\Driver\ClientEncryption::getKeyByAltName(string `$keyAltName`): ?object

Finds a single key document in the key vault collection with the given alternate name `keyAltName`.

### 参数

`keyAltName`

  Alternate name for the key document.

### 返回值

Returns the key document, or `null` if no document matched.

### 错误／异常

- Throws MongoDB\Driver\Exception\InvalidArgumentException on argument parsing errors.
- Throws MongoDB\Driver\Exception\ConnectionException if connection to the server fails (for reasons other than authentication).
- Throws MongoDB\Driver\Exception\AuthenticationException if authentication is needed and fails.
- Throws MongoDB\Driver\Exception\RuntimeException on other errors.

### 参见

- MongoDB\Driver\ClientEncryption::addKeyAltName() - Adds an alternate name to a key document
- MongoDB\Driver\ClientEncryption::removeKeyAltName() - Removes an alternate name from a key document

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