我有一个包含AES加密数据的数据库，该加密数据存储在BLOB中，但是当在下面的查询中选择数据时，返回值为<?xml version="1.0" encoding="UTF-8"?>
<mule xmlns:imap="http://www.mulesoft.org/schema/mule/imap"
xmlns:email="http://www.mulesoft.org/schema/mule/email"
xmlns="http://www.mulesoft.org/schema/mule/core"
xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
xmlns:spring="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
http://www.mulesoft.org/schema/mule/imap http://www.mulesoft.org/schema/mule/imap/current/mule-imap.xsd
http://www.mulesoft.org/schema/mule/email http://www.mulesoft.org/schema/mule/email/current/mule-email.xsd">
<imap:connector name="IMAP_Security"
validateConnections="true" doc:name="IMAP"/>
<email:email-to-string-transformer mimeType="text/html" name="Email_to_String" doc:name="Email to String" encoding="UTF-8"/>
<flow name="emailprocessorFlow">
<imap:inbound-endpoint host="localhost" port="143" connector-ref="IMAP_Security" responseTimeout="10000" disableTransportTransformer="true" doc:name="IMAP" transformer-refs="Email_to_String" encoding="UTF-8"/>
<logger message="initial payload## #[message.payloadAs(String)]" level="INFO" doc:name="Logger"/>
<set-variable variableName="sender" value="${poller}" doc:name="poller"/>
<set-variable variableName="inbox" value="${username}" doc:name="email User Name"/>
<base64-encoder-transformer name="Base64-Encoder-Transformer_Headers"
doc:name="Headers Base64 Encoder" encoding="utf-8">
</base64-encoder-transformer>
</flow>
</mule>
NULL