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172 lines
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HTML
172 lines
9.2 KiB
HTML
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<!-- <div class="container"> -->
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<!-- <h1>Load data into PostgreSQL. Fast.</h1> -->
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<h1>Loading Fixed Width Data File with pgloader</h1><p>Some data providers still use a format where each column is specified with a starting index position and a given length. Usually the columns are blank-padded when the data is shorter than the full reserved range. </p><h2>The Command</h2><p>To load data with <a href="http://pgloader.io/">pgloader</a> you need to define in a <em>command</em> the operations in some details. Here's our example for loading Fixed Width Data, using a file provided by the US census. </p><p>You can find more files from them at the <a href="http://www.census.gov/geo/maps-data/data/gazetteer2000.html">Census 2000 Gazetteer Files</a>. </p><p>Here's our command: </p><pre><code>LOAD ARCHIVE
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FROM http://www.census.gov/geo/maps-data/data/docs/gazetteer/places2k.zip
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INTO postgresql:///pgloader
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BEFORE LOAD DO
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$$ drop table if exists places; $$,
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$$ create table places
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(
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usps char(2) not null,
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fips char(2) not null,
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fips_code char(5),
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loc_name varchar(64)
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);
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$$
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LOAD FIXED
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FROM FILENAME MATCHING ~/places2k.txt/
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WITH ENCODING latin1
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(
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usps from 0 for 2,
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fips from 2 for 2,
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fips_code from 4 for 5,
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"LocationName" from 9 for 64 [trim right whitespace],
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p from 73 for 9,
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h from 82 for 9,
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land from 91 for 14,
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water from 105 for 14,
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ldm from 119 for 14,
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wtm from 131 for 14,
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lat from 143 for 10,
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long from 153 for 11
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)
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INTO postgresql:///pgloader?places
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(
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usps, fips, fips_code, "LocationName"
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); </code></pre><p>You can see the full list of options in the <a href="pgloader.1.html">pgloader reference manual</a>, with a complete description of the options you see here. </p><h2>The Data</h2><p>This command allows loading the following file content, where we are only showing the first couple of lines: </p><pre><code>AL0100124Abbeville city 2987 1353 40301945 120383 15.560669 0.046480 31.566367 -85.251300
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AL0100460Adamsville city 4965 2042 50779330 14126 19.606010 0.005454 33.590411 -86.949166
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AL0100484Addison town 723 339 9101325 0 3.514041 0.000000 34.200042 -87.177851
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AL0100676Akron town 521 239 1436797 0 0.554750 0.000000 32.876425 -87.740978
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AL0100820Alabaster city 22619 8594 53023800 141711 20.472605 0.054715 33.231162 -86.823829
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AL0100988Albertville city 17247 7090 67212867 258738 25.951034 0.099899 34.265362 -86.211261
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AL0101132Alexander City city 15008 6855 100534344 433413 38.816529 0.167342 32.933157 -85.936008 </code></pre><h2>Loading the data</h2><p>Let's start the <code>pgloader</code> command with our <code>census-places.load</code> command file: </p><pre><code>$ pgloader census-places.load
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... LOG Starting pgloader, log system is ready.
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... LOG Parsing commands from file "/Users/dim/dev/pgloader/test/census-places.load"
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... LOG Fetching 'http://www.census.gov/geo/maps-data/data/docs/gazetteer/places2k.zip'
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... LOG Extracting files from archive '//private/var/folders/w7/9n8v8pw54t1gngfff0lj16040000gn/T/pgloader//places2k.zip'
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table name read imported errors time
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----------------- --------- --------- --------- --------------
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download 0 0 0 1.494s
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extract 0 0 0 1.013s
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before load 2 2 0 0.013s
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----------------- --------- --------- --------- --------------
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places 25375 25375 0 0.499s
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----------------- --------- --------- --------- --------------
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Total import time 25375 25375 0 3.019s </code></pre><p>We can see that <a href="pgloader">http://pgloader.io</a> did download the file from its HTTP URL location then <em>unziped</em> it before the loading itself. </p><p>Note that the output of the command has been edited to facilitate its browsing online. </p> </div>
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