Mapping from a database

Peterson

Linux

• PHP and MySQL were largely developed under Linux – open source operating system based on UNIX

• Linus Torvalds – – “Hello everybody out there! I'm doing a (free)

operating system … (just a hobby, won't be big and professional) for 386(486) AT clones. This has been brewing since april, and is starting to get ready.I'd like any feedback.”

PHP and MySQL

• Most Linux installation procedures include the option of installing PHP and MySQL.

• Administration of online databases is done through phpMyAdmin – Available through the cPanel

• Purpose of exercises:– Develop familiarity with PHP– Input and query MySQL tables

PHP Example 1

PHP example 2

PHP example 3

PHP example 4

PHP Example 5

PHP Example 6

PHP Example 7

PHP Example 8

cPanel

MySQL is used to define new tables

SQL

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Structure

SQL

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mysql_connect.php

All Capitals

//connection to database and querying<?php

include 'mysql_connect.php';$table = "us_capitals";$sql = "SELECT name, usstate, population, Y(location), X(location) FROM $table";$res = mysql_query($sql);

if($res){$num = mysql_num_rows($res);while($row = mysql_fetch_array($res)){

// contents one row of database$lat = $row['X(location)'];$lon = $row['Y(location)'];$name = $row['name'];$state = $row['usstate'];$pop = $row['population'];

// create markerecho 'var myLatlng = new google.maps.LatLng('.$lat.','.$lon.');';echo 'var marker = new google.maps.Marker({position: myLatlng, map: map, title: "'.$name.', Population: '.$pop.'", icon: image, shadow: shadow});';

// info message will be attachedecho 'attachMessage(marker, "'.$name.'", "'.$state.'", "'.$pop.'");';

}} else echo "alert('SQL-Error getting data from database...')";mysql_close($conn);

?>

North of Omaha / less than 500,000

//connection to database and querying<?php

include 'mysql_connect.php';$table = "us_capitals";$sql = "SELECT name, usstate, population, Y(location), X(location)

FROM $table WHERE X(location) > 41.25 AND population < 500000";$res = mysql_query($sql);

Select within box

<?php

//define coordinates and draw rectangle to map

include 'mysql_connect.php';$table = "us_capitals";$sql =" SELECT name, Y(location), X(location), usstate, population FROM us_capitals

WHERE Intersects( location, GeomFromText( 'POLYGON((40 -96, 44 -96, 44 -70, 40 -70, 40 -96))' ) ) ";

DROP TABLE IF EXISTS cities; create table cities (

city VARCHAR(30),location GEOMETRY NOT NULL,SPATIAL INDEX(location),PRIMARY KEY (city)

);INSERT INTO cities (city, location) VALUES ("Omaha", GeomFromText('POINT(41.25 -96)'));INSERT INTO cities (city, location) VALUES ("Atlanta", GeomFromText('POINT(33.755 -84.39)'));INSERT INTO cities (city, location) VALUES ("Lincoln", GeomFromText('POINT(40.809722 -96.675278)'));DROP TABLE IF EXISTS dl_airports; create table dl_airports (

city VARCHAR(30),airport VARCHAR(30),code VARCHAR(3),FOREIGN KEY (city) REFERENCES cities(city),PRIMARY KEY (code)

);INSERT INTO dl_airports (city, airport, code) VALUES ("Omaha","Omaha Eppley Airfield", "OMA");INSERT INTO dl_airports (city, airport, code) VALUES ("Atlanta","Hartsfield-Jackson International Airport", "ATL");INSERT INTO dl_airports (city, airport, code) VALUES ("Lincoln","Municipal Airport", "LNK");DROP TABLE IF EXISTS dl_routes; create table dl_routes (

airportCode VARCHAR(3),destinationCode VARCHAR(3),FOREIGN KEY (airportCode) references dl_airports(code),FOREIGN KEY (destinationCode) references dl_airports(code)

);INSERT INTO dl_routes (airportCode, destinationCode) VALUES ("OMA","ATL");INSERT INTO dl_routes (airportCode, destinationCode) VALUES ("OMA","DET");INSERT INTO dl_routes (airportCode, destinationCode) VALUES ("OMA","MEM");

Part of the SQL code for entering three tables that provide city

location, airport information, and airline connections.

Flight Routes

<?phpinclude 'mysql_connect.php';$sql = "SELECT cDep.city AS departure , X( cDep.location ) AS latDep , Y( cDep.location ) AS lngDep, cDst.city AS destination ,

X( cDst.location ) AS latDest, Y( cDst.location ) AS lngDestFROM ( ( (

dl_routes AS rtINNER JOIN dl_airports AS ap1 ON rt.airportcode = ap1.code

)INNER JOIN dl_airports AS ap2 ON rt.destinationcode = ap2.code

)INNER JOIN cities AS cDep ON cDep.city = ap1.city_name

)INNER JOIN cities AS cDst ON cDst.city = ap2.city_name";

$res = mysql_query($sql);

if($res){$num = mysql_num_rows($res);while($row = mysql_fetch_array($res)){

echo "var flightPlanCoordinates = [ new google.maps.LatLng(".$row['latDep'].", ".$row['lngDep']."), new google.maps.LatLng(".$row['latDest'].", ".$row['lngDest'].")];flightPath = new google.maps.Polyline({path: flightPlanCoordinates,strokeColor: \"#FF0000\",strokeOpacity: 0.8,geodesic: true,strokeWeight: 1

});flightPath.setMap(map);";}

} else echo "alert('SQL-Error getting data from database...')";mysql_close($conn);

?>

Selected routes

$sql = "SELECT cDep.city AS departure, X( cDep.location ) AS latDep, Y( cDep.location ) AS lngDep, cDst.city AS destination, X( cDst.location ) AS latDest, Y( cDst.location ) AS lngDestFROM (((dl_routes AS rtINNER JOIN dl_airports AS ap1 ON rt.airportcode = ap1.code)INNER JOIN dl_airports AS ap2 ON rt.destinationcode = ap2.code)INNER JOIN cities AS cDep ON cDep.city = ap1.city_name)INNER JOIN cities AS cDst ON cDst.city = ap2.city_nameWHERE cDep.city = 'Omaha'";

$res = mysql_query($sql);

create table ne_counties (strokecolor VARCHAR(7),strokewidth INT(5),strokeopacity FLOAT(5),fillcolor VARCHAR(7),fillopacity FLOAT(5),popdata INT(15),name VARCHAR(30),geom GEOMETRY NOT NULL,SPATIAL INDEX(geom)

); INSERT INTO ne_counties (strokecolor, strokewidth , strokeopacity , fillcolor, fillopacity , popdata, name, geom) VALUES ("#008800",1,1.0,"#FFCC00",0.06674,33185,"county", GeomFromText('POLYGON((40.698311157 -98.2829258865,40.698311157 -98.2781218448,40.3505519215 -98.2781218448,40.3500181391 -98.3309663027,40.3504184759 -98.3344358884,40.3504184759 -98.7238301514,40.6413298855 -98.7242304882,40.6897706386 -98.7244973794,40.6989783851 -98.7243639338,40.6991118307 -98.7214281306,40.6985780482 -98.686198492,40.698311157 -98.2829258865, 40.698311157 -98.2829258865))'));

INSERT INTO ne_counties (strokecolor, strokewidth , strokeopacity , fillcolor, fillopacity , popdata, name, geom) VALUES ("#008800",1,1.0,"#FFCC00",0.01334,6931,"county", GeomFromText('POLYGON((41.9149346991 -98.2956032185,42.0888143169 -98.2954697729,42.0888143169 -98.3004072602,42.3035282886 -98.3005407058,42.4369738893 -98.300140369,42.4377745629 -97.8344152223,42.2326686746 -97.8352158959,42.0897484361 -97.8346821135,42.0347688486 -97.8341483311,41.9164026008 -97.8332142119,41.9152015904 -98.0647423292,41.9149346991 -98.2956032185, 41.9149346991 -98.2956032185))'));

MySQL commands, attributes, and coordinates for placing two county

polygons for Nebraska into a MySQL database.

Nebraska county polygons

//connection to database and querying<?php

include 'mysql_connect.php';$sql = "SELECT popdata, AsText(ExteriorRing(geom)) AS linestring FROM ne_counties;";$res = mysql_query($sql);// first statement -> get all polygonsif($res){

// loop through all polygonswhile($row = mysql_fetch_array($res)){$linestring = $row['linestring']; //points of current county polygon$pop = $row['popdata']; //population of current county//linestring includes all points of current polygon LINESTRING(40.698311157 -

98.2829258865,40.69831115...)//delete not needed characters$clearedLS = str_replace(array("LINESTRING(" , "," , ")"),array(""," ",""),$linestring); //parse the string in PHP and store coordinates in array$coordinates = explode(" ", $clearedLS);//read coordinates from array by pair

//and finally create javascript GM latitude/longitude objects for polygonsecho "var pts = new Array();";$j=0;

for ($i =0; $i<count($coordinates); $i=$i+2){echo "pts[".$j."] = new

google.maps.LatLng(".$coordinates[$i].",".$coordinates[$i+1].");";$j++;

}echo "polygon = new google.maps.Polygon({

paths: pts,strokeColor: '#0000FF',strokeOpacity: 1.0,strokeWeight: 0.5,fillColor: '#0000FF',fillOpacity: 0.4

});";echo "polygon.setMap(map);";

}} else echo "alert('SQL-Error getting data from database...')";mysql_close($conn);

?>

Nebraska county population

// Find the min and max population values for the 93 counties after doing a non-linear transformation using the log function var min=100000000; var max=-100000000; for (var i = 0; i < 93; i++) {

// Log the data to deal with counties with large populations popdata[i] = Math.log(popdata[i])

if (popdata[i] < min) { min=popdata[i] }if (popdata[i] > max) { max=popdata[i] }

}// Find the range and compute the opacities for each polygonvar range = max-min// compute an opacity as a range of the data values opacities = new Array () for (var i = 0; i < 93; i++) {

opacities[i] = 1-((max - popdata[i]) / range)}

Counties with less than 50,000

$sql = "SELECT popdata, AsText(ExteriorRing(geom)) AS linestring FROM ne_counties WHERE popdata < 50000;";

$res = mysql_query($sql);

<?phpinclude 'mysql_connect.php';$sql = "SELECT popdata, AsText( ExteriorRing( geom ) ) AS geom

FROM ne_countiesWHERE Intersects( GeomFromText( 'POINT(41.25 -96)' ) , geom )

OR Intersects( GeomFromText( 'POINT(40.809722 -96.675278)' ) , geom )OR Intersects( GeomFromText( 'POINT(40.700833 -99.081111)' ) , geom )

";$res = mysql_query($sql);