From: Regina Obe <lr@pcorp.us>
Date: Tue, 27 Dec 2011 06:01:58 +0000 (+0000)
Subject: replace java example with a simpler more useful one
X-Git-Tag: 2.0.0alpha1~284
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=d3706ece9c84799314ac1a2e5c0607dec68416e7;p=postgis

replace java example with a simpler more useful one

git-svn-id: http://svn.osgeo.org/postgis/trunk@8591 b70326c6-7e19-0410-871a-916f4a2858ee
---

diff --git a/doc/using_raster_dataman.xml b/doc/using_raster_dataman.xml
index d02e17909..3e9077387 100644
--- a/doc/using_raster_dataman.xml
+++ b/doc/using_raster_dataman.xml
@@ -612,19 +612,14 @@ public class TestRaster : IHttpHandler
    		</sect2>
    		<sect2 id="RT_Java_Console_App">
    			<title>Java console app that outputs raster query as PNG file</title>
-   			<para>In this section, we'll demonstrate how to use PostgreSQL JDBC driver and the <xref linkend="RT_ST_AsGDALRaster" /> family of functions to
-   				output band 1,2,3 of a raster to a file.</para>
-   				
-   			<para>The sample query demonstrates how to combine a whole bunch of raster functions together to grab all tiles that intersect
-   				a particular wgs 84 bounding box and then unions with <xref linkend="RT_ST_Union" /> the intersecting tiles together returning all bands, transforms to user specified projection using <xref linkend="RT_ST_Transform" />,
-   				and then outputs the results as a png using <xref linkend="RT_ST_AsPNG" />.</para>
-   				<para>This is same example as <xref linkend="RT_PHP_Output" /> except implemented in C#.</para>
-   				<para>You would call the below using <programlisting>java -jar SaveQueryImage.jar "2249"</programlisting> to get the raster image in Massachusetts state plane feet in a file in the same folder.  The file will be called <varname>test.png</varname></para>
-   				<para>You can compile the following code using a command something like:
+   			<para>This is a simple java console app that takes a query that returns one image and outputs to specified file.</para>
+   				<para>You can compile the following code using a command something like:</para>
 <programlisting>set env CLASSPATH .:..\postgresql-9.0-801.jdbc4.jar
 javac SaveQueryImage.java
 jar cfm SaveQueryImage.jar Manifest.txt *.class</programlisting>
-   				<programlisting> -- Manifest.txt --
+<para>And call it from the command-line with something like</para>
+<programlisting>java.exe -jar SaveQueryImage.jar -jar SaveQueryImage.jar "SELECT ST_AsPNG(ST_AsRaster(ST_Buffer(ST_Point(1,5),10, 'quad_segs=2'),150, 150, '8BUI',100));" "test.png" </programlisting>
+<programlisting> -- Manifest.txt --
 <![CDATA[Class-Path: postgresql-9.0-801.jdbc4.jar
 Main-Class: SaveQueryImage]]></programlisting>
    			<programlisting>// Code for SaveQueryImage.java
@@ -649,31 +644,21 @@ public class SaveQueryImage {
       }
       
       Connection conn = null;
-	  int srid = 26986;
       
       try {
         conn = DriverManager.getConnection("jdbc:postgresql://localhost:5432/mydb","myuser", "mypwd");
         conn.setAutoCommit(false);
 
-        PreparedStatement sGetImg = conn.prepareStatement("SELECT ST_AsPNG( " +
-			" ST_Transform( " + 
-			   "  ST_AddBand(ST_Union(rast,1), ARRAY[ST_Union(rast,2),ST_Union(rast,3)]) " +
-			"	,?) ) As new_rast " +
-			" FROM aerials.boston " +  
-			" WHERE " + 
-			" ST_Intersects(rast, ST_Transform(ST_MakeEnvelope(-71.1217, 42.227, -71.1210, 42.218,4326),26986) );");
-		if (argv.length > 0) {
-			srid = Integer.parseInt(argv[0]);
-		}
-        sGetImg.setInt(1, srid);
-        
+        PreparedStatement sGetImg = conn.prepareStatement(argv[0]);
+		
         ResultSet rs = sGetImg.executeQuery();
 		
 		FileOutputStream fout;
 		try
 		{
 			rs.next();
-			fout = new FileOutputStream(new File("test.png") );
+			/** Output to file name requested by user **/
+			fout = new FileOutputStream(new File(argv[1]) );
 			fout.write(rs.getBytes(1));
 			fout.close();
 		}