relpipe-data/examples-hello-world.xml
author František Kučera <franta-hg@frantovo.cz>
Tue, 05 Feb 2019 19:18:28 +0100
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<stránka
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	xmlns="https://trac.frantovo.cz/xml-web-generator/wiki/xmlns/strana"
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	xmlns:m="https://trac.frantovo.cz/xml-web-generator/wiki/xmlns/makro">
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	<nadpis>Hello Wordl!</nadpis>
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	<perex>generating relational data from CLI arguments</perex>
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	<m:pořadí-příkladu>00100</m:pořadí-příkladu>
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	<text xmlns="http://www.w3.org/1999/xhtml">
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		<p>
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			Let's start with an obligatory Hello World example.
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		</p>
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		<m:pre jazyk="bash"><![CDATA[relpipe-in-cli generate "relation_from_cli" 3 \
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	"a" "integer" \
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	"b" "string" \
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	"c" "boolean" \
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	"1" "Hello" "true" \
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	"2" "World!" "false"]]></m:pre>
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		<p>
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			This command generates relational data.
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			In order to see them, we need to convert them to some other format.
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			For now, we will use the "tabular" format and pipe relational data to the <code>relpipe-out-tabular</code>.
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		</p>
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		<m:pre jazyk="bash"><![CDATA[relpipe-in-cli generate "relation_from_cli" 3 \
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		"a" "integer" \
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		"b" "string" \
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		"c" "boolean" \
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		"1" "Hello" "true" \
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		"2" "World!" "false" \
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	| relpipe-out-tabular]]></m:pre>
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		<p>Output:</p>
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		<pre><![CDATA[relation_from_cli:
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 ╭─────────────┬────────────┬─────────────╮
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 │ a (integer) │ b (string) │ c (boolean) │
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 ├─────────────┼────────────┼─────────────┤
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 │           1 │ Hello      │        true │
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 │           2 │ World!     │       false │
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 ╰─────────────┴────────────┴─────────────╯
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Record count: 2
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]]></pre>
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		<p>
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			The syntax is simple as we see above. We specify the name of the relation, number of attributes,
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			and then their definitions (names and types),
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			followed by the data.
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		</p>
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		<p>
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			A single stream may contain multiple relations:
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		</p>		
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		<m:pre jazyk="bash"><![CDATA[(relpipe-in-cli generate a 1 x string hello; \
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 relpipe-in-cli generate b 1 y string world) \
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	| relpipe-out-tabular]]></m:pre>
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		<p>
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			Thus we can combine various commands or files and pass the result to a single relational output filter (<code>relpipe-out-tabular</code> in this case) and get:
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		</p>
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		<pre><![CDATA[a:
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 ╭────────────╮
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 │ x (string) │
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 ├────────────┤
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 │ hello      │
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 ╰────────────╯
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Record count: 1
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b:
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 ╭────────────╮
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 │ y (string) │
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 ├────────────┤
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 │ world      │
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 ╰────────────╯
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Record count: 1]]></pre>
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	</text>
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</stránka>