Commit afe17921 authored by Marcus Klang's avatar Marcus Klang
Browse files

Initial snapshot.

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# Tentamen i EDAF20, 21 april 2020
Detta repository innehåller följande:
+ Denna fil, [`README.md`](README.md) -- den innehåller bara lite
information, och du skall inte ändra i den.
+ En markdown-fil,
[`answers-and-comments.md`](answers-and-comments.md), med plats för
dina svar och kommentarer till frågorna. I denna fil skall du även
ange vid vilken/vilka tidpunkter som du kan ta den muntliga delen av
din tenta (en Zoom-intervju).
+ En fil `er-model.png`, som är en 'placeholder' för din ER-modell.
Meningen är att du skall rita din ER-modell i uppgift 1 i något
rit-program, och spara resultatet i en fil med namnet `er-model.png`
(din fil kommer att ersätta den gamla filen). Observera att vi
kräver att din ER-modell ritas med UML-notation, som i:
![](er-model.png)
Inscannade handritade figurer rättas inte.
+ En katalog `python-bottle` med ett skelett för en REST-service
implementerad med
[Python/Bottle](https://bottlepy.org/docs/stable/). Skelettet ligger
i filen `api.py`, och det använder en SQLite3-databas med namnet
`db.sqlite`, i samma katalog -- i filen `create-database.sql` skall
du skriva din SQL-kod för att skapa databasen.
+ En katalog `java-spark` med ett [gradle]()-projekt som använder
[Java/Spark](http://sparkjava.com/) för att implementera en
REST-service. Huvudprogrammet ligger i filen
`src/main/java/app/App.java`, och det använder en SQLite3-databas
med namnet `db.sqlite` i projektets rot-katalog (alltså
`java-spark/db.sqlite`) -- i filen `create-database.sql` skall du
skriva din SQL-kod för att skapa databasen.
# Uppgifter
Uppgifterna kommer att publiceras under tentans gång -- preliminärt
kommer vi att ha följande tidsschema (uppgifterna nedan är exempel på
hur det skulle kunna se ut, om vi hade haft ungefär samma uppgifter
som på mars-tentan):
+ [Del 1](http://fileadmin.cs.lth.se/cs/Education/edaf75/58bbea62-5039-42fd-b271-fd8912dbdd7f/sample-exam/problem1.html) (uppgift 1): 14:00 - 15:30
+ [Del 2](http://fileadmin.cs.lth.se/cs/Education/edaf75/58bbea62-5039-42fd-b271-fd8912dbdd7f/sample-exam/problem2.html) (uppgift 2): 15:40 - 17:40
+ [Del 3](http://fileadmin.cs.lth.se/cs/Education/edaf75/58bbea62-5039-42fd-b271-fd8912dbdd7f/sample-exam/problem3-6.html) (uppgift 3-6): 17:50:00 - 19:00
Om vi skulle få tekniska problem under tentan kommer vi att meddela
eventuella förändringar i Zoom-mötet.
# Svar och kommentarer
Denna tentamen består av en skriftlig del och en muntlig del (ca 10-20
minuter), då du i en Zoom-intervju får redogöra för hur du resonerat i
dina lösningar, och lösa någon extrauppgift.
För den muntliga delen kommer vi (eventuellt) att kontakta dig under
någon av nedanstående alternativa tidsintervaller -- du måste ange
minst ett intervall under vilket du kan ta din intervju, om du inte
svarar när vi kontaktar dig under detta tidsintervall så kommer du att
få din tentamen annullerad.
+ onsdag 22 april, 10-12
+ onsdag 22 april, 14-16
+ torsdag 23 april, 10-12
+ torsdag 23 april, 14-16
+ fredag 24 april, 10-12
+ fredag 24 april, 14-16
Ange vilken/vilka tider du kan på här: ...
Nedanför skall du skriva in dina svar till uppgift 3-5, och eventuella
kommentarer till uppgift 1 och 2. Observera att vi tittar på hur ditt
repository ser ut klockan 15:30 när vi rättar uppgift 1, så eventuella
kommentarer till uppgift 1 som du lägger till efter det kommer vi inte
att se när vi rättar. Motsvarande gäller uppgift 2, där vi bara ser
sådant som du gör fram till klockan 17:40.
## Uppgift 1
![](er-model.png)
## Uppgift 2
Kommentarer: ...
## Uppgift 3
Här skall du skriva ditt svar på uppgift 3, enligt följande mall:
a. Vi får nyckeln ... eftersom ...
och ...
b. Relationen är inte i BCNF, eftersom ...
c. Relationen är (inte) i BCNF, eftersom ...
d. Vi kan bryta ner R till relationer som är i BNCF, och som har
egenskapen att de kan ...
## Uppgift 4
**Svar:**
## Uppgift 5
**Svar:**
## Uppgift 6
**Svar:**
#
# https://help.github.com/articles/dealing-with-line-endings/
#
# These are explicitly windows files and should use crlf
*.bat text eol=crlf
# Ignore Gradle project-specific cache directory
.gradle
# Ignore Gradle build output directory
build
plugins {
// Apply the java plugin to add support for Java
id 'java'
// Apply the application plugin to add support for building a CLI application.
id 'application'
}
repositories {
// Use jcenter for resolving dependencies.
// You can declare any Maven/Ivy/file repository here.
jcenter()
}
dependencies {
// This dependency is used by the application.
implementation 'com.google.guava:guava:28.2-jre'
// Use JUnit Jupiter API for testing.
testImplementation 'org.junit.jupiter:junit-jupiter-api:5.6.0'
// Use JUnit Jupiter Engine for testing.
testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.6.0'
// https://mvnrepository.com/artifact/org.xerial/sqlite-jdbc
implementation group: 'org.xerial', name: 'sqlite-jdbc', version: '3.30.1'
implementation "com.sparkjava:spark-core:2.8.0"
}
application {
// Define the main class for the application.
mainClassName = 'app.App'
}
test {
// Use junit platform for unit tests
useJUnitPlatform()
}
-- Du skall tabellen nedan med dina egna tabeller.
DROP TABLE IF EXISTS some_table;
CREATE TABLE some_table (
some_attribute TEXT,
PRIMARY KEY (some_attribute)
);
-- Här kan du göra insättningar i dina tabeller, så att du kan testa
-- din databas.
INSERT
INTO some_table(some_attribute)
VALUES ('Ett värde'),
('Ett annat värde');
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-bin.zip
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
#!/usr/bin/env sh
#
# Copyright 2015 the original author or authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
##############################################################################
##
## Gradle start up script for UN*X
##
##############################################################################
# Attempt to set APP_HOME
# Resolve links: $0 may be a link
PRG="$0"
# Need this for relative symlinks.
while [ -h "$PRG" ] ; do
ls=`ls -ld "$PRG"`
link=`expr "$ls" : '.*-> \(.*\)$'`
if expr "$link" : '/.*' > /dev/null; then
PRG="$link"
else
PRG=`dirname "$PRG"`"/$link"
fi
done
SAVED="`pwd`"
cd "`dirname \"$PRG\"`/" >/dev/null
APP_HOME="`pwd -P`"
cd "$SAVED" >/dev/null
APP_NAME="Gradle"
APP_BASE_NAME=`basename "$0"`
# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
# Use the maximum available, or set MAX_FD != -1 to use that value.
MAX_FD="maximum"
warn () {
echo "$*"
}
die () {
echo
echo "$*"
echo
exit 1
}
# OS specific support (must be 'true' or 'false').
cygwin=false
msys=false
darwin=false
nonstop=false
case "`uname`" in
CYGWIN* )
cygwin=true
;;
Darwin* )
darwin=true
;;
MINGW* )
msys=true
;;
NONSTOP* )
nonstop=true
;;
esac
CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
# Determine the Java command to use to start the JVM.
if [ -n "$JAVA_HOME" ] ; then
if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
# IBM's JDK on AIX uses strange locations for the executables
JAVACMD="$JAVA_HOME/jre/sh/java"
else
JAVACMD="$JAVA_HOME/bin/java"
fi
if [ ! -x "$JAVACMD" ] ; then
die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
else
JAVACMD="java"
which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
fi
# Increase the maximum file descriptors if we can.
if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
MAX_FD_LIMIT=`ulimit -H -n`
if [ $? -eq 0 ] ; then
if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
MAX_FD="$MAX_FD_LIMIT"
fi
ulimit -n $MAX_FD
if [ $? -ne 0 ] ; then
warn "Could not set maximum file descriptor limit: $MAX_FD"
fi
else
warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
fi
fi
# For Darwin, add options to specify how the application appears in the dock
if $darwin; then
GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
fi
# For Cygwin or MSYS, switch paths to Windows format before running java
if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
APP_HOME=`cygpath --path --mixed "$APP_HOME"`
CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
JAVACMD=`cygpath --unix "$JAVACMD"`
# We build the pattern for arguments to be converted via cygpath
ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
SEP=""
for dir in $ROOTDIRSRAW ; do
ROOTDIRS="$ROOTDIRS$SEP$dir"
SEP="|"
done
OURCYGPATTERN="(^($ROOTDIRS))"
# Add a user-defined pattern to the cygpath arguments
if [ "$GRADLE_CYGPATTERN" != "" ] ; then
OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
fi
# Now convert the arguments - kludge to limit ourselves to /bin/sh
i=0
for arg in "$@" ; do
CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option
if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition
eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
else
eval `echo args$i`="\"$arg\""
fi
i=`expr $i + 1`
done
case $i in
0) set -- ;;
1) set -- "$args0" ;;
2) set -- "$args0" "$args1" ;;
3) set -- "$args0" "$args1" "$args2" ;;
4) set -- "$args0" "$args1" "$args2" "$args3" ;;
5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
esac
fi
# Escape application args
save () {
for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
echo " "
}
APP_ARGS=`save "$@"`
# Collect all arguments for the java command, following the shell quoting and substitution rules
eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
exec "$JAVACMD" "$@"
@rem
@rem Copyright 2015 the original author or authors.
@rem
@rem Licensed under the Apache License, Version 2.0 (the "License");
@rem you may not use this file except in compliance with the License.
@rem You may obtain a copy of the License at
@rem
@rem https://www.apache.org/licenses/LICENSE-2.0
@rem
@rem Unless required by applicable law or agreed to in writing, software
@rem distributed under the License is distributed on an "AS IS" BASIS,
@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@rem See the License for the specific language governing permissions and
@rem limitations under the License.
@rem
@if "%DEBUG%" == "" @echo off
@rem ##########################################################################
@rem
@rem Gradle startup script for Windows
@rem
@rem ##########################################################################
@rem Set local scope for the variables with windows NT shell
if "%OS%"=="Windows_NT" setlocal
set DIRNAME=%~dp0
if "%DIRNAME%" == "" set DIRNAME=.
set APP_BASE_NAME=%~n0
set APP_HOME=%DIRNAME%
@rem Resolve any "." and ".." in APP_HOME to make it shorter.
for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
@rem Find java.exe
if defined JAVA_HOME goto findJavaFromJavaHome
set JAVA_EXE=java.exe
%JAVA_EXE% -version >NUL 2>&1
if "%ERRORLEVEL%" == "0" goto init
echo.
echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
echo.
echo Please set the JAVA_HOME variable in your environment to match the
echo location of your Java installation.
goto fail
:findJavaFromJavaHome
set JAVA_HOME=%JAVA_HOME:"=%
set JAVA_EXE=%JAVA_HOME%/bin/java.exe
if exist "%JAVA_EXE%" goto init
echo.
echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
echo.
echo Please set the JAVA_HOME variable in your environment to match the
echo location of your Java installation.
goto fail
:init
@rem Get command-line arguments, handling Windows variants
if not "%OS%" == "Windows_NT" goto win9xME_args
:win9xME_args
@rem Slurp the command line arguments.
set CMD_LINE_ARGS=
set _SKIP=2
:win9xME_args_slurp
if "x%~1" == "x" goto execute
set CMD_LINE_ARGS=%*
:execute
@rem Setup the command line
set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
@rem Execute Gradle
"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
:end
@rem End local scope for the variables with windows NT shell
if "%ERRORLEVEL%"=="0" goto mainEnd
:fail
rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
rem the _cmd.exe /c_ return code!
if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
exit /b 1
:mainEnd
if "%OS%"=="Windows_NT" endlocal
:omega
/*
* This file was generated by the Gradle 'init' task.
*
* The settings file is used to specify which projects to include in your build.
*
* Detailed information about configuring a multi-project build in Gradle can be found
* in the user manual at https://docs.gradle.org/6.3/userguide/multi_project_builds.html
*/
rootProject.name = 'rest-service'
package app;
import static spark.Spark.*;
import java.sql.*;
import java.util.*;
import spark.*;
public class App {
public static void main(String[] args) {
port(4567);
var db = new Database("db.sqlite");
get("/hello", (req, res) -> "get: hello, world!");
post("/hello", (req, res) -> "post: hello, world!");
}
}
class Database {
/**
* The database connection.
*/
private Connection conn;
/**
* Creates the database interface object. Connection to the
* database is performed later.
*/
public Database(String filename) {
openConnection(filename);
}
/**
* Opens a connection to the database, using the specified
* filename (if we'd used a traditional DBMS, such as PostgreSQL
* or MariaDB, we would have specified username and password
* instead).
*/
public boolean openConnection(String filename) {
try {
Class.forName("org.sqlite.JDBC");
conn = DriverManager.getConnection("jdbc:sqlite:" + filename);
} catch (SQLException e) {
e.printStackTrace();
return false;
} catch (ClassNotFoundException e) {
e.printStackTrace();
return false;
}
return true;
}
/**
* Closes the connection to the database.
*/
public void closeConnection() {
try {
if (conn != null) {
conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}
/**
* Checks if the connection to the database has been established
*
* @return true if the connection has been established
*/
public boolean isConnected() {
return conn != null;
}
/* ================================== */
/* --- insert your own code below --- */
/* ===============================*== */
}
/**
* Auxiliary class for automatically translating a ResultSet to JSON
*/
class JSONizer {
public static String toJSON(ResultSet rs, String name) throws SQLException {
StringBuilder sb = new StringBuilder();
ResultSetMetaData meta = rs.getMetaData();
boolean first = true;
sb.append("{\n");
sb.append(" \"" + name + "\": [\n");
while (rs.next()) {
if (!first) {
sb.append(",");
sb.append("\n");
}
first = false;
sb.append(" {");
for (int i = 1; i <= meta.getColumnCount(); i++) {
String label = meta.getColumnLabel(i);
String value = getValue(rs, i, meta.getColumnType(i));
sb.append("\"" + label + "\": " + value);
if (i < meta.getColumnCount()) {
sb.append(", ");
}
}
sb.append("}");
}
sb.append("\n");
sb.append(" ]\n");
sb.append("}\n");
return sb.toString();
}
private static String getValue(ResultSet rs, int i, int columnType) throws SQLException {
switch (columnType) {
case java.sql.Types.INTEGER:
return String.valueOf(rs.getInt(i));
case java.sql.Types.REAL:
case java.sql.Types.DOUBLE: