如何将 xquery 结果包装在元素中？
how to wrap xquery results in elements?
如何将每个结果包装在 <book_result> 元素中？
xquery 本身：
<new_cat>{
for $x in catalog/book
order by $x/title
return ($x/title, $x/author)
}</new_cat>
运行良好，但书名和作者未包含在新书中：
thufir@dur:~/basex/microsoft$
thufir@dur:~/basex/microsoft$ basex -i w3school_data title_author.xq
<new_cat>
<title>Creepy Crawlies</title>
<author>Knorr, Stefan</author>
<title>Lover Birds</title>
<author>Randall, Cynthia</author>
<title>MSXML3: A Comprehensive Guide</title>
<author>O'Brien, Tim</author>
<title>Maeve Ascendant</title>
<author>Corets, Eva</author>
<title>Microsoft .NET: The Programming Bible</title>
<author>O'Brien, Tim</author>
<title>Midnight Rain</title>
<author>Ralls, Kim</author>
<title>Oberon's Legacy</title>
<author>Corets, Eva</author>
<title>Paradox Lost</title>
<author>Kress, Peter</author>
<title>Splish Splash</title>
<author>Thurman, Paula</author>
<title>The Sundered Grail</title>
<author>Corets, Eva</author>
<title>Visual Studio 7: A Comprehensive Guide</title>
<author>Galos, Mike</author>
<title>XML Developer's Guide</title>
<author>Gambardella, Matthew</author>
</new_cat>thufir@dur:~/basex/microsoft$
thufir@dur:~/basex/microsoft$
数据库：
thufir@dur:~/basex/microsoft$
thufir@dur:~/basex/microsoft$ basex -i w3school_data /
<catalog>
<book id="bk101">
<author>Gambardella, Matthew</author>
<title>XML Developer's Guide</title>
<genre>Computer</genre>
<price>44.95</price>
<publish_date>2000-10-01</publish_date>
<description>An in-depth look at creating applications
with XML.</description>
</book>
<book id="bk102">
<author>Ralls, Kim</author>
<title>Midnight Rain</title>
<genre>Fantasy</genre>
<price>5.95</price>
<publish_date>2000-12-16</publish_date>
<description>A former architect battles corporate zombies,
an evil sorceress, and her own childhood to become queen
of the world.</description>
</book>
<book id="bk103">
<author>Corets, Eva</author>
<title>Maeve Ascendant</title>
<genre>Fantasy</genre>
<price>5.95</price>
<publish_date>2000-11-17</publish_date>
<description>After the collapse of a nanotechnology
society in England, the young survivors lay the
foundation for a new society.</description>
</book>
<book id="bk104">
<author>Corets, Eva</author>
<title>Oberon's Legacy</title>
<genre>Fantasy</genre>
<price>5.95</price>
<publish_date>2001-03-10</publish_date>
<description>In post-apocalypse England, the mysterious
agent known only as Oberon helps to create a new life
for the inhabitants of London. Sequel to Maeve
Ascendant.</description>
</book>
<book id="bk105">
<author>Corets, Eva</author>
<title>The Sundered Grail</title>
<genre>Fantasy</genre>
<price>5.95</price>
<publish_date>2001-09-10</publish_date>
<description>The two daughters of Maeve, half-sisters,
battle one another for control of England. Sequel to
Oberon's Legacy.</description>
</book>
<book id="bk106">
<author>Randall, Cynthia</author>
<title>Lover Birds</title>
<genre>Romance</genre>
<price>4.95</price>
<publish_date>2000-09-02</publish_date>
<description>When Carla meets Paul at an ornithology
conference, tempers fly as feathers get ruffled.</description>
</book>
<book id="bk107">
<author>Thurman, Paula</author>
<title>Splish Splash</title>
<genre>Romance</genre>
<price>4.95</price>
<publish_date>2000-11-02</publish_date>
<description>A deep sea diver finds true love twenty
thousand leagues beneath the sea.</description>
</book>
<book id="bk108">
<author>Knorr, Stefan</author>
<title>Creepy Crawlies</title>
<genre>Horror</genre>
<price>4.95</price>
<publish_date>2000-12-06</publish_date>
<description>An anthology of horror stories about roaches,
centipedes, scorpions and other insects.</description>
</book>
<book id="bk109">
<author>Kress, Peter</author>
<title>Paradox Lost</title>
<genre>Science Fiction</genre>
<price>6.95</price>
<publish_date>2000-11-02</publish_date>
<description>After an inadvertant trip through a Heisenberg
Uncertainty Device, James Salway discovers the problems
of being quantum.</description>
</book>
<book id="bk110">
<author>O'Brien, Tim</author>
<title>Microsoft .NET: The Programming Bible</title>
<genre>Computer</genre>
<price>36.95</price>
<publish_date>2000-12-09</publish_date>
<description>Microsoft's .NET initiative is explored in
detail in this deep programmer's reference.</description>
</book>
<book id="bk111">
<author>O'Brien, Tim</author>
<title>MSXML3: A Comprehensive Guide</title>
<genre>Computer</genre>
<price>36.95</price>
<publish_date>2000-12-01</publish_date>
<description>The Microsoft MSXML3 parser is covered in
detail, with attention to XML DOM interfaces, XSLT processing,
SAX and more.</description>
</book>
<book id="bk112">
<author>Galos, Mike</author>
<title>Visual Studio 7: A Comprehensive Guide</title>
<genre>Computer</genre>
<price>49.95</price>
<publish_date>2001-04-16</publish_date>
<description>Microsoft Visual Studio 7 is explored in depth,
looking at how Visual Basic, Visual C++, C#, and ASP+ are
integrated into a comprehensive development
environment.</description>
</book>
</catalog>thufir@dur:~/basex/microsoft$
thufir@dur:~/basex/microsoft$
但只想将每个结果作为一本不同的书。我尝试将 return 包装为：
thufir@dur:~/basex/microsoft$
thufir@dur:~/basex/microsoft$ basex -i get_books.xq
BaseX 9.0.1 [Standalone]
Try 'help' to get more information.
>
> exit
See you.
thufir@dur:~/basex/microsoft$
thufir@dur:~/basex/microsoft$ cat get_books.xq
<new_cat>{
for $x in catalog/book
order by $x/title
return <new_book>($x/title, $x/author)</new_book>
}</new_cat>
thufir@dur:~/basex/microsoft$
但显然那是行不通的。
另见：
就创建所有这些 new_book 元素而言，return <new_book>($x/title, $x/author)</new_book> 尝试很好，但要填充它们，您需要改用花括号：return <new_book>{$x/title, $x/author}</new_book>（请参阅 https://www.w3.org/TR/xquery-31/#dt-enclosed-expression and https://www.w3.org/TR/xquery-31/#id-element-constructor ).
如何将每个结果包装在 <book_result> 元素中？
xquery 本身：
<new_cat>{
for $x in catalog/book
order by $x/title
return ($x/title, $x/author)
}</new_cat>
运行良好，但书名和作者未包含在新书中：
thufir@dur:~/basex/microsoft$
thufir@dur:~/basex/microsoft$ basex -i w3school_data title_author.xq
<new_cat>
<title>Creepy Crawlies</title>
<author>Knorr, Stefan</author>
<title>Lover Birds</title>
<author>Randall, Cynthia</author>
<title>MSXML3: A Comprehensive Guide</title>
<author>O'Brien, Tim</author>
<title>Maeve Ascendant</title>
<author>Corets, Eva</author>
<title>Microsoft .NET: The Programming Bible</title>
<author>O'Brien, Tim</author>
<title>Midnight Rain</title>
<author>Ralls, Kim</author>
<title>Oberon's Legacy</title>
<author>Corets, Eva</author>
<title>Paradox Lost</title>
<author>Kress, Peter</author>
<title>Splish Splash</title>
<author>Thurman, Paula</author>
<title>The Sundered Grail</title>
<author>Corets, Eva</author>
<title>Visual Studio 7: A Comprehensive Guide</title>
<author>Galos, Mike</author>
<title>XML Developer's Guide</title>
<author>Gambardella, Matthew</author>
</new_cat>thufir@dur:~/basex/microsoft$
thufir@dur:~/basex/microsoft$
数据库：
thufir@dur:~/basex/microsoft$
thufir@dur:~/basex/microsoft$ basex -i w3school_data /
<catalog>
<book id="bk101">
<author>Gambardella, Matthew</author>
<title>XML Developer's Guide</title>
<genre>Computer</genre>
<price>44.95</price>
<publish_date>2000-10-01</publish_date>
<description>An in-depth look at creating applications
with XML.</description>
</book>
<book id="bk102">
<author>Ralls, Kim</author>
<title>Midnight Rain</title>
<genre>Fantasy</genre>
<price>5.95</price>
<publish_date>2000-12-16</publish_date>
<description>A former architect battles corporate zombies,
an evil sorceress, and her own childhood to become queen
of the world.</description>
</book>
<book id="bk103">
<author>Corets, Eva</author>
<title>Maeve Ascendant</title>
<genre>Fantasy</genre>
<price>5.95</price>
<publish_date>2000-11-17</publish_date>
<description>After the collapse of a nanotechnology
society in England, the young survivors lay the
foundation for a new society.</description>
</book>
<book id="bk104">
<author>Corets, Eva</author>
<title>Oberon's Legacy</title>
<genre>Fantasy</genre>
<price>5.95</price>
<publish_date>2001-03-10</publish_date>
<description>In post-apocalypse England, the mysterious
agent known only as Oberon helps to create a new life
for the inhabitants of London. Sequel to Maeve
Ascendant.</description>
</book>
<book id="bk105">
<author>Corets, Eva</author>
<title>The Sundered Grail</title>
<genre>Fantasy</genre>
<price>5.95</price>
<publish_date>2001-09-10</publish_date>
<description>The two daughters of Maeve, half-sisters,
battle one another for control of England. Sequel to
Oberon's Legacy.</description>
</book>
<book id="bk106">
<author>Randall, Cynthia</author>
<title>Lover Birds</title>
<genre>Romance</genre>
<price>4.95</price>
<publish_date>2000-09-02</publish_date>
<description>When Carla meets Paul at an ornithology
conference, tempers fly as feathers get ruffled.</description>
</book>
<book id="bk107">
<author>Thurman, Paula</author>
<title>Splish Splash</title>
<genre>Romance</genre>
<price>4.95</price>
<publish_date>2000-11-02</publish_date>
<description>A deep sea diver finds true love twenty
thousand leagues beneath the sea.</description>
</book>
<book id="bk108">
<author>Knorr, Stefan</author>
<title>Creepy Crawlies</title>
<genre>Horror</genre>
<price>4.95</price>
<publish_date>2000-12-06</publish_date>
<description>An anthology of horror stories about roaches,
centipedes, scorpions and other insects.</description>
</book>
<book id="bk109">
<author>Kress, Peter</author>
<title>Paradox Lost</title>
<genre>Science Fiction</genre>
<price>6.95</price>
<publish_date>2000-11-02</publish_date>
<description>After an inadvertant trip through a Heisenberg
Uncertainty Device, James Salway discovers the problems
of being quantum.</description>
</book>
<book id="bk110">
<author>O'Brien, Tim</author>
<title>Microsoft .NET: The Programming Bible</title>
<genre>Computer</genre>
<price>36.95</price>
<publish_date>2000-12-09</publish_date>
<description>Microsoft's .NET initiative is explored in
detail in this deep programmer's reference.</description>
</book>
<book id="bk111">
<author>O'Brien, Tim</author>
<title>MSXML3: A Comprehensive Guide</title>
<genre>Computer</genre>
<price>36.95</price>
<publish_date>2000-12-01</publish_date>
<description>The Microsoft MSXML3 parser is covered in
detail, with attention to XML DOM interfaces, XSLT processing,
SAX and more.</description>
</book>
<book id="bk112">
<author>Galos, Mike</author>
<title>Visual Studio 7: A Comprehensive Guide</title>
<genre>Computer</genre>
<price>49.95</price>
<publish_date>2001-04-16</publish_date>
<description>Microsoft Visual Studio 7 is explored in depth,
looking at how Visual Basic, Visual C++, C#, and ASP+ are
integrated into a comprehensive development
environment.</description>
</book>
</catalog>thufir@dur:~/basex/microsoft$
thufir@dur:~/basex/microsoft$
但只想将每个结果作为一本不同的书。我尝试将 return 包装为：
thufir@dur:~/basex/microsoft$
thufir@dur:~/basex/microsoft$ basex -i get_books.xq
BaseX 9.0.1 [Standalone]
Try 'help' to get more information.
>
> exit
See you.
thufir@dur:~/basex/microsoft$
thufir@dur:~/basex/microsoft$ cat get_books.xq
<new_cat>{
for $x in catalog/book
order by $x/title
return <new_book>($x/title, $x/author)</new_book>
}</new_cat>
thufir@dur:~/basex/microsoft$
但显然那是行不通的。
另见：
就创建所有这些 new_book 元素而言，return <new_book>($x/title, $x/author)</new_book> 尝试很好，但要填充它们，您需要改用花括号：return <new_book>{$x/title, $x/author}</new_book>（请参阅 https://www.w3.org/TR/xquery-31/#dt-enclosed-expression and https://www.w3.org/TR/xquery-31/#id-element-constructor ).