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COV888 - CSE IIT Delhi Document1 Table 1, 2 Class Exercises 2 ✓ ✏ ✓ ✏ [I](Exercsie2) XMLDatabase [2] [I] Simple Start [4] • Developed by - University of Konstanz, Germany • BaseX Software for −→ XML databases • Latest version - BaseX 8.5 −→ www.basex.org • 1 File (with xml data) −→ db Document in ”DATA”in basex • XML Database Engine for −→ Xpath, XQuery 3.1 processor • Many XML Documents (can go into) −→ Data • Full support for W3C updates • Multiple tables in a database −→ single tree/graph in xml 1 File (XML data) −→ Document in basex/data directory • Interactive and User friendly Graphical user interface (GUI) ✒ ✑ • Open Source Software ✒ ✑ ✓ ✏ [I](Ex.2) XMLDatabase [3] Customers ✓ ✏ Data in xml Account COV888 - CSE IIT Delhi Document1 Table 1, 2 Class Exercises 2 Query Languages for XML Databases System File Documents .... in local ( 2016 - 2017 ) Semester 1 Container directory ✒ ✑ Containers ... dbxml ✒ ✑ ✓ ✏ ✓ ✏ [I] ( Ex. 2 ) Hello ! XML [6] [I] ( Ex. 2 ) Create DB [8] • Download BaseX OR on Linux • 2. create student database from student.xml cd; cp /misc/buffer/Courses/COV888/BaseX81.zip . a) To start baseGUI • unzip BaseX81.zip to get DIRECTORY ’basex’ ; chmod a+xr basex cd basex/bin ; ./basexgui (basex GUI) • Delete −→ BaseX81.zip b)confirm database path • Ckeck basex directory −→ ls basex/* ; ls basex/*/* ; Options −→ Preferences −→ General −→ Database Path Homedir/basex/data • Read Contents of −→ basex/readme ✒ ✑ c) create student database click menu Database −→ New −→ Input file: homedir/basex/etc/student.xml Name of database: student > ls basex/data/student ✒ ✑ ✓ ✏ ✓ ✏ [I] Simple Start [5] [I] ( Ex. 2 ) Create DB ! XML [7] • Read Wikipedia −→ en.wikipedia.org/wiki/basex • 1. create file student.xml in ./basex/etc/ XML data is stored in Container files ~/basex/etc/<file.xml> . <students> <student> • Container −→ XML document <name>Sastry</name> last OHP: Tables −→ XML Document −→ DB −→ DATA in ”basex” <sex>M</sex> <age>23</age> Help: Basex Graphical User Interface </student> http://docs.basex.org/wiki/Graphical_User_Interface <student> <name>RaghuRam</name> Help: XQUERY 3.0 <sex>M</sex> http://docs.basex.org/wiki/XQuery_3.0 <age>18</age> Help: XSLT </student> https://users.dimi.uniud.it/~massimo.franceschet/caffe- </students> ✒ ✑ xml/xslt/xslt-processors.html ✒ ✑ ✓ ✏ ✓ ✏ [I] Test XPath Queries [10] [I] XQUERY [12] a) List full contents in students ( db in xml ) TASK 6: Execute XQUERY query statements /students ( in Editor area in top line at 1.) PRESS [>] in editor a) Find age of all students for $s in doc(’student’)//student b) Find details of all students let $sage := $s/age return <result>{$sage}</result> /students/student ; ( use short form ’//student’ for student db ) b) Find age of all students ( order by age ) c) Find names of all students for $s in doc(’student’)//student /students/student/name (or //student/name ) let $sage := $s/age/text() order by $s/age d) Find student names (with no tags) return <result>{$sage}</result> ✒ ✑ /students/student/name/text() ( or //student/name/text() ) ✒ ✑ ✓ ✏ ✓ ✏ [I] ( Ex. 2 ) Create DB in GUI [9] [I] XPath Queries [11] e) Find age of all students ------------------------------------- | | | /students/student/age ( or //student/age ) |Query |Linksto | |(Editor) |TagsinXMLdb| f) Find age of all students (with no tags ) | | | ------------------------------------- /students/student/age/text() ( or //student/age/text() ) | | | |Resultsof |DB | g) Find student all details of student RaghuRam | Query | Details | | | | /students/student[name="RaghuRam"] (or //student[name="RaghuRam"] ) ------------------------------------- h) Find age of watanabe (without tags) • Click on Links to tags after loading DB /students/student[name="RaghuRam"]/age/text() ✒ ✑ (or //student[name="RaghuRam"]/age/text() ) ✒ ✑ ✓ ✏ ✓ ✏ [I] Hello ! XML (Contd.) [14] [I](Ex. 2)CreateBOOKdatabase [16] ...Conitued from previous page/slide Exercise : <student> <name>RaghuRam</name> 1. create ’book’ database <sex>M</sex> cp /misc/buffer/Courses/COV888/Grid.xml ~/basex/etc/Grid.xml <age>18</age> </student> Database -> New -> Input file : homedir/basex/etc/Grid.xml <student> Name of database: book <name>Sastry</name> OK ; Check its tag names for query purposes <sex>M</sex> <age>22</age> 2. create ’bookexer2’ database /student> </students> cp /misc/buffer/Courses/COV888/Php.xml ~/basex/etc/Php.xml ✒ ✑ Database -> New -> Input file : homedir/basex/etc/Php.xml Name of database: bookexer2 OK ; Check its tag names for query purposes ✒ ✑ ✓ ✏ ✓ ✏ [I] Hello ! XML (Contd.) [13] [I] Hello ! XML (Contd.) [15] Add new data in student.xml (step at b) as follows ) c) create student database a) drop student database Click Database -> New -> Input file : homedir/basex/etc/student.xml Name of database: student Database -> open & manage -> selectt student -> drop Check if < OK > (Editor box, Click on tags in Box on right ) b) Use Editor for file ~/basex/etc/student.xml to add Getting information about more Commands: details of student "Ajay Singh" References : <students> <student> 1. Basex Graphical User Interface <name>Sastry</name> http://docs.basex.org/wiki/Graphical_User_Interface <sex>M</sex> <age>23</age> </student> 2. XQUERY 3.0 http://docs.basex.org/wiki/XQuery_3.0 .... Continued on next Slide/page ... ✒ ✑ ✒ ✑ ✓ ✏ ✓ ✏ [I](Ex. 2)CreateBOOKdatabase [18] [I] (Ex. B) [20] • The two files (Grid.xml and Php.xml ) b) Find book titles without tags ( //Title/text() ) were downloaded from Amazon.com (web services) • Draw a graph c) Find names of Manufacturers without tags 1. Draw a rooted, acyclic graph with unique path d) Find details of DetailPageURL with no tags for data in the file Grid.xml (use paper and pencil) 2. Draw a rooted, acyclic graph with unique path e) Find ASIN numbers without tags for data in the file Php.xml (use paper and pencil) 3. Are these graphs same or different ? ✒ ✑ ✒ ✑ ✓ ✏ ✓ ✏ [I](Ex. 2)CreateBOOKdatabase [17] [I] ( Ex. A ) XML Exercises [19] • Study the database (bookexer2) for the data file : Php.xml 2. Run xpath for Queries on database ’ book ’ (study its tags) • 2. Do all XPath query steps a) to e) above on ’ bookexer2 ’ a) Find names of Authors without tags ( //Author/text() ) • 3. Book topic is PHP ANSWER> • 4. Prepare your SAMPLE file - sIDxxxx.txt William H. Kemp Timothy Samara −→ create a file sIDxxxx.txt with XPath commands and results Rex A. Ewing; Doug Pratt Kimberly Elam • Submit sIDxxxxx.txt with Xpath queries on Php.xml Josef Muller-Brockmann Mary Engelbreit ✒ ✑ Phillip F. Schewe Andy Riley Jonathan Gennick ✒ ✑ ✓ ✏ ✓ ✏ [I] (EX-D) Simple Start [22] [I] (EX-E) XML exercise sample XSLT [24] 10.3 Write the DTD and a XML representation for the following nested-relational schema- 10.5 List all skill types in Emp (write query in XSLT). Emp = (ename,ChildrenSet SETOF(Children),SkillSet SETOF(Skills)) (Read XSLT notes in slides and See sample answer ) Children = (name,Birthday) Birthday = (day,month,year) Skills = (type,ExamSet SETOF(Exams)) ✒ ✑ Exams = (year,city) (see, files 10.03 dtd and xml) ✒ ✑ ✓ ✏ ✓ ✏ [I] (EX-C) Simple Start [21] [I] (EX-D) XML demo exercises [23] 1. copy file: /public/public/database/xml-exercises.tar (unpack) 2. load the xml data into ’ basex ’ The file contains answers for problems- 10.1, 10.3, 10.5,10.14,10.15, and data (figure10.1). Run the following queries, using templates from xml-exercises.tar 10.1 Consider the Bank database in XML in Figure 10.1. 10.3a Find the names of all employees who have a child, who has a Change the XML data to a different form (xml--> xml). birthday in March (write in XQuery). Prepare another XML file, using attributes instead of subelements. Also, write DTD file for the new XML data. 10.3b Find those employees who took an examination for the skill type ’typing’ in the city ’Dayton’ (write in XQuery). ( see Answer (DTD and xml) in the unpacked tar files ). 10.3c List all skill types in Emp (write in XQuery). ✒ ✑ ✒ ✑ ✓ ✏ [I] (EX-E) XML Exercises [26] 1. Do the following questions. Compare your answers with solutions in the ’xml-exercises.tar’ ------------------------------------------------------ 10.14 Show the tree representation of the XML data in Figure 10.1. Please use nodes and child relationship. 10.15 Consider the following recursive DTD <!DOCTYPE parts[ <!ELEMENT part (name,subpartinfo*)> <!ELEMENT subpartinfo (part,quantity)> <!ELEMENT name ( #PCDATA )> <!ELEMENT quantity ( #PCDATA )> ]> ( a ) Give a small example of data for the above DTD. ( b ) Show how to map this DTD to a relational schema. (Assume part names are unique. Whenever a part appears,its subpart structure will be same). ✒ ✑ ✓ ✏ [I] (EX-E) XML Exercises [25] Load the database in Figure 10.1 into a container. execute XQuery statements for following queries, A) Find the names of all customer who have an account (A101). B) Find those accounts which belong to Johnson C) List all depositors D) List all account numbers in Bank (write in Xquery). Submit a file ’ex3.txt’ which includes xquery for the above questions A)-D). ✒ ✑.
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