Courses NumNameDesc Record Field Table Credits

“PROJECT”“SELECT” Operators on Tables

Classes Tables: one entry per section of each course offered Courses Table: one entry per class that’s ever offered

Database Application logic (system programming language) SQL Record at a time processing

SQL Example select coursenumber, isIEMP from course where coursenumber = 603;

A Join Operation select coursenumber, coursename from course, class where course.courseid=class.xrefcourseid and class.yearoffered=1999 and class.termoffered='FALL';

The Web Interface

Websites that Serve Files Web browser Web serverFile system 2. filename 3. File contents 1. URL 4. HTML

Dynamically Generated Pages Web browser Web serverFile system Script interpreter 4. File contents 5. HTML 2. filename 3. File contents 1. URL 6. HTML

PHP Exercise <? echo " Your Query has returned 7 hits. "; echo " "; for ($i=0;$i<7;$i++) { echo " "; echo "column 1 row $i ", " "; echo "column 2 row $i", " "; } echo " "; ?> RUN

Database-Generated Pages Web browser Web server DBMS File system Script interpreter 5. SQL statement 6. Query result 4. File contents 7. HTML 2. filename 3. File contents 1. URL 8. HTML

<? mysql_connect("ebola.si.umich.edu:3306","webuser",""); $result = mysql("presnick", "SELECT coursenumber,coursename FROM course,class WHERE course.courseid=class.xrefcourseid AND class.yearoffered='1997' ORDER BY coursenumber"); $num = mysql_numrows($result); echo " Your Query has returned $num hits. "; echo " "; for ($i=0;$i<$num;$i++) { echo " "; echo mysql_result($result,$i,"coursenumber")." "; echo mysql_result($result,$i,"coursename")." "; } mysql_close(); echo " "; ?> RUN

PHP Exercise Class information of 1997 from presnick's database Your Query has returned 40 hits. 501 Use of Information 502 Choice and Learning 511 Technology in Design: Methods and Means...

COUNT Query select count(*) as total from course where coursenumber= 603;

GROUP By Query select isarm, count(*) from course group by isarm;

XML: Data + Structure 501 Use of Information 502 Choice and Learning 511 Technology in Design: Methods and Means

XSL: Presentation RUN

XML Processing Web browser Web server DBMS File system Script interpreter 5. SQL statement 6. Query result 4. File contents 7. XML 2. filename 3. File contents 1. URL 8. XML & XSL Preprocessor HTML Rendering Engine HTML

Generating XML … $num = mysql_numrows($result); for ($i=0;$i<$num;$i++) { echo " "; echo " ”. mysql_result($result,$i,"coursenumber")." "; echo " ". mysql_result($result,$i,"coursename")." "; echo " "; } … RUNRUN

Referral Today ACME AIDS Consortium Linda’s Meals DB

Referral Tomorrow ACME AIDS Consortium Linda’s Meals DB XML + formatting

Referral Eventually ACME AIDS Consortium Linda’s Meals DB XML DB

AIDS Consortium Form Client Name: D.O.B. Sex: Male Female

Linda’s Meals Form Client Name: SSN: