sqloptions:initialDatabase 标头元素
客户端可以通过 sqloptions:initialDatabase SOAP 标头指定首先要连接到的数据库，例如：
<SOAP-ENV:Header
xmlns:SOAP-ENV="https://schemas.xmlsoap.org/soap/envelope/"
xmlns:sqloptions="https://schemas.microsoft.com/sqlserver/2004/SOAP/Options">
<sqloptions:initialDatabase
SOAP-ENV:mustUnderstand="1"
value="databaseName"
optional="true" | "false"
filename="databaseFileName" />
</SOAP-ENV:Header>
sqloptions:initialDatabase 选项显示为 SOAP 标头。该标头由一个名为 sqloptions:initialDatabase 的元素组成。该元素具有一个必需的属性 value。这是一个字符串值。value 属性指定要连接到的初始数据库的名称。该字符串的解释方式如同 USE Transact-SQL 命令。该元素有两个可选属性：optional（布尔值，默认值为 false）和 filename（字符串值，默认值为 null)）。optional 属性指定无法连接到数据库时是否应失败。登录：false 表示登录应失败，true 表示登录可以继续。filename 值提供登录时要附加的数据库的文件名。这样，通过附加已分离数据库，用户就可以登录到该数据库。
在一个请求中只能有一个 sqloptions:initialDatabase 选项实例。该选项无法在响应中显示。多个选项实例将会生成错误。
如果接收请求的端点配置了默认数据库，则会生成错误。出于安全考虑，客户端不能对具有默认数据库的端点指定 sqloptions:initialDatabase 标头。
如果使用 SOAP 会话，则必须在与 sqloptions:sqlsession initiate 属性相同的请求中显示此选项。如果在任何带有 sqloptions:sqlSession 标头但不包含 initiate 属性的请求中显示此选项，则将生成错误。
以下是有关 sqloptions:initialDatabase 选项的架构片段：
<xs:element name="initialDatabase" form="qualified">
<xs:annotation>
<xs:documentation>
Set initial database on login.
</xs:documentation>
</xs:annotation>
<xs:complexType>
<xs:attribute use="required" name="value" type="xs:string" form="unqualified">
<xs:annotation>
<xs:documentation>
The name of the initial database to attach to.
</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute
name="optional"
default="false"
type="xs:boolean"
form="unqualified">
<xs:annotation>
<xs:documentation>
Whether the initial database is optional or not.
</xs:documentation>
</xs:annotation>
</xs:attribute>
<xs:attribute name="filename" type="xs:string" form="unqualified">
<xs:annotation>
<xs:documentation>
The filename of the database to attach.
</xs:documentation>
</xs:annotation>
</xs:attribute>
</xs:complexType>
</xs:element>
示例
以下是在 SOAP 请求和响应消息中使用 sqloptions:initialDatabase 标头的示例。
请求
<SOAP-ENV:Envelope xmlns:SOAP-ENV="https://schemas.xmlsoap.org/soap/envelope/"
xmlns:sql="https://schemas.microsoft.com/sqlserver/2004/SOAP"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:sqlparam="https://schemas.microsoft.com/sqlserver/2004/SOAP/types/SqlParameter"
xmlns:sqlsoaptypes="https://schemas.microsoft.com/sqlserver/2004/SOAP/types"
xmlns:sqloptions="https://schemas.microsoft.com/sqlserver/2004/SOAP/Options">
<SOAP-ENV:Header>
<sqloptions:initialDatabase SOAP-ENV:mustUnderstand="1"
value="dbTestForAttaching"
optional="false"
filename="!DBDATADIR!\dbTestForAttaching.mdf" />
</SOAP-ENV:Header>
<SOAP-ENV:Body>
<sql:sqlbatch>
<sql:BatchCommands>
SELECT name FROM sys.databases WHERE database_id=(SELECT dbid FROM master.dbo.sysprocesses WHERE spid=@@spid)
SELECT TOP 1 object_id FROM sys.objects WHERE object_id=(SELECT TOP 1 object_id FROM dbTestForAttaching.sys.objects)
</sql:BatchCommands>
</sql:sqlbatch>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
响应
<SOAP-ENV:Envelope xml:space="preserve"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:SOAP-ENV="https://schemas.xmlsoap.org/soap/envelope/"
xmlns:sql="https://schemas.microsoft.com/sqlserver/2004/SOAP"
xmlns:sqlsoaptypes="https://schemas.microsoft.com/sqlserver/2004/SOAP/types"
xmlns:sqlrowcount="https://schemas.microsoft.com/sqlserver/2004/SOAP/types/SqlRowCount"
xmlns:sqlmessage="https://schemas.microsoft.com/sqlserver/2004/SOAP/types/SqlMessage"
xmlns:sqlresultstream="https://schemas.microsoft.com/sqlserver/2004/SOAP/types/SqlResultStream"
xmlns:sqltransaction="https://schemas.microsoft.com/sqlserver/2004/SOAP/types/SqlTransaction"
xmlns:sqltypes="https://schemas.microsoft.com/sqlserver/2004/sqltypes">
<SOAP-ENV:Body>
<sql:sqlbatchResponse>
<sql:sqlbatchResult>
<sqlresultstream:SqlRowSet xsi:type="sqlsoaptypes:SqlRowSet">
<diffgr:diffgram xmlns:diffgr="urn:schemas-microsoft-com:xml-diffgram-v1">
<SqlRowSet1 xmlns="urn:schemas-microsoft-com:sql:SqlRowSet1">
<row>
<name>dbTestForAttaching</name>
</row>
</SqlRowSet1>
</diffgr:diffgram>
</sqlresultstream:SqlRowSet>
<sqlresultstream:SqlRowCount xsi:type="sqlrowcount:SqlRowCount">
<sqlrowcount:Count>1</sqlrowcount:Count>
</sqlresultstream:SqlRowCount>
<sqlresultstream:SqlRowSet xsi:type="sqlsoaptypes:SqlRowSet">
<diffgr:diffgram xmlns:diffgr="urn:schemas-microsoft-com:xml-diffgram-v1">
<SqlRowSet2 xmlns="urn:schemas-microsoft-com:sql:SqlRowSet2">
<row>
<object_id>val</object_id>
</row>
</SqlRowSet2>
</diffgr:diffgram>
</sqlresultstream:SqlRowSet>
<sqlresultstream:SqlRowCount xsi:type="sqlrowcount:SqlRowCount">
<sqlrowcount:Count>1</sqlrowcount:Count>
</sqlresultstream:SqlRowCount>
</sql:sqlbatchResult>
</sql:sqlbatchResponse>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>