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Commit d639942f authored by Goik Martin's avatar Goik Martin
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MongoDB exercise

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...@@ -36,28 +36,233 @@ ...@@ -36,28 +36,233 @@
like:</para> like:</para>
<programlisting language="json">{ <programlisting language="json">{
"lecture" : { "title" : "Software development 1",
"title" : "Software development 2",
"prerequisites" : [113105, 113102]
},
"studyCourse" : "MIB", "studyCourse" : "MIB",
"programme" : "Bachelor", "programme" : "Bachelor",
"recommendedSemesters" : { "recommendedSemesters" : {
"semester" : [4, 6, 7], "semester" : [1, 2]
" comment" : "Advanced topics" },
"lecture_id" : 113105
}
{
"title" : "Software development 2",
"prerequisites" : [113105, 113102],
"studyCourse" : "MIB",
"programme" : "Bachelor",
"recommendedSemesters" : {
"semester" : [2, 3, 4]
}, },
"lecture_id" : 113213 "lecture_id" : 113213
}</programlisting> }
<para>Modify attribute values to create at least three {
different lectures.</para> "title" : "Object Recognition in Image and Video Data",
"studyCourse" : "CSM",
"programme" : "Master",
"recommendedSemesters" : {
"semester" : [1, 2, 3]
},
"lecture_id" : 143108
}</programlisting>
</listitem>
<listitem xml:id="sda1ItemMongoDefineIndex">
<para>Define a <link
xlink:href="https://docs.mongodb.com/manual/core/index-unique">unique
index</link> on the <property>lecture_id</property> property
and check whether the MongoDB Server rejects an attempt
inserting a duplicate key value.</para>
</listitem> </listitem>
<listitem> <listitem>
<para/> <para>List all index definitions.</para>
</listitem>
<listitem>
<para>Taking a glimpse at <link
xlink:href="https://docs.mongodb.com/getting-started/shell/query">Find
or Query Data with the mongo Shell</link> and craft the
following queries:</para>
<orderedlist>
<listitem>
<para>All lectures.</para>
</listitem>
<listitem>
<para>The (unique) lecture having
<property>lecture_id</property>=113213.</para>
</listitem>
<listitem>
<para>All lectures belonging to a <quote>Master</quote>
programme.</para>
</listitem>
<listitem>
<para>All lectures being recommended for semester
4.</para>
</listitem>
<listitem>
<para>All lectures</para>
</listitem>
</orderedlist>
</listitem>
<listitem>
<para>Drop your index definition from step <xref
linkend="sda1ItemMongoDefineIndex"/>.</para>
</listitem> </listitem>
</orderedlist> </orderedlist>
</question> </question>
<answer>
<orderedlist>
<listitem>
<para>Database server acknowledgement <coref
linkend="sda1ProgMongoInsertAck"/> upon insertion of three
lectures <coref linkend="sda1ProgMongoInsertS1"/>, <coref
linkend="sda1ProgMongoInsertS2"/> and <coref
linkend="sda1ProgMongoInsertS1"/> :</para>
<programlisting language="json">db.university.insertMany(
[
{
"title" : "Software development 1",
"studyCourse" : "MIB",
"programme" : "Bachelor",
"recommendedSemesters" : {
"semester" : [1, 2]
},
"lecture_id" : 113105
}, {...
}
]);
{
"acknowledged" : true,<co xml:id="sda1ProgMongoInsertAck"/>
"insertedIds" : [
ObjectId("586942cb27e04cf209347687"), <co xml:id="sda1ProgMongoInsertS1"/>
ObjectId("586942cb27e04cf209347688"), <co xml:id="sda1ProgMongoInsertS2"/>
ObjectId("586942cb27e04cf209347689") <co xml:id="sda1ProgMongoInsertS3"/>
]
}</programlisting>
</listitem>
<listitem>
<para>Defining a <link
xlink:href="https://docs.mongodb.com/manual/core/index-unique">unique
index</link> on the <property>lecture_id</property>
property:</para>
<programlisting language="json">&gt; db.university.createIndex( { "lecture_id": 1 }, { unique: true } )
{
"createdCollectionAutomatically" : false,
"numIndexesBefore" : 1,
"numIndexesAfter" : 2,
"ok" : 1
}</programlisting>
<para>Now a duplicate key value insert attempt gets flagged
as an error:</para>
<programlisting language="json">db.university.insert({
"title" : "Object Recognition in Image and Video Data",
...
"lecture_id" : 143108 })
WriteResult({
"nInserted" : 0,
"writeError" : {
"code" : 11000,
"errmsg" : "E11000 duplicate key error collection: test.university index:
lecture_id_1 dup key: { : 143108.0 }"
}
})</programlisting>
</listitem>
<listitem>
<para>Obtaining a list of all index definitions:</para>
<programlisting language="json">&gt; db.university.getIndexes()
[
{ <co linkends="sda1CalloutMongoListIndexes-1"
xml:id="sda1CalloutMongoListIndexes-1-co"/>
"v" : 2,
"key" : {
"_id" : 1
},
"name" : "_id_",
"ns" : "test.university"
},
{ <co linkends="sda1CalloutMongoListIndexes-2"
xml:id="sda1CalloutMongoListIndexes-2-co"/>
"v" : 2,
"unique" : true,
"key" : {
"lecture_id" : 1
},
"name" : "lecture_id_1",
"ns" : "test.university"
}
]
&gt;</programlisting>
<calloutlist>
<callout arearefs="sda1CalloutMongoListIndexes-1-co"
xml:id="sda1CalloutMongoListIndexes-1">
<para>First index being automatically generated by
MogoDB.</para>
</callout>
<callout arearefs="sda1CalloutMongoListIndexes-2-co"
xml:id="sda1CalloutMongoListIndexes-2">
<para>Custom key definition from previous step.</para>
</callout>
</calloutlist>
</listitem>
<listitem>
<para>Taking a glimpse at <link
xlink:href="https://docs.mongodb.com/getting-started/shell/query">Find
or Query Data with the mongo Shell</link> and craft the
following queries:</para>
<orderedlist>
<listitem>
<para>All lectures.</para>
</listitem>
<listitem>
<para>The (unique) lecture having
<property>lecture_id</property>=113213.</para>
</listitem>
<listitem>
<para>All lectures belonging to a <quote>Master</quote>
programme.</para>
</listitem>
<listitem>
<para>All lectures being recommended for semester
4.</para>
</listitem>
<listitem>
<para>All lectures</para>
</listitem>
</orderedlist>
</listitem>
<listitem>
<para>Dropping a custom index:</para>
<programlisting language="json">&gt; db.university.dropIndex( { "lecture_id": 1 } )
{ "nIndexesWas" : 2, "ok" : 1 }</programlisting>
</listitem>
</orderedlist>
</answer>
</qandaentry> </qandaentry>
</qandadiv> </qandadiv>
</qandaset> </qandaset>
......
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