Differences

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--- projects:digikey_partsdb [2013/10/12 08:44] – charliex
+++ projects:digikey_partsdb [2013/10/13 10:11] (current) – charliex
@@ Line 873: / Line 873: @@
 == grabbing FV's ==
-we need the FV's to crawl each subsection.
+we need the FV's to crawl each subsection. grab all the above urls, make sure Results per Page = 500. The CSV download is capped at 500 results per fetch, so no point increasing this value.
   * <input type=hidden name=FV value=fff40000,fff80000>
@@ Line 881: / Line 881: @@
   * <a class="Last" href="/product-search/en/undefined-category/undefined-family/0/page/8">Last</a>
-The page/8 is the total page count, pages start from 1
+The page/8" is the total page count, pages start from 1
 grab the FV value and page count, and store for each of the above URL's
 == crawl individual pages ==
+curl with a valid useragent i used --useragent "Chrome/1.0" but vary it to avoid rate limiters.
+<code>
+curl.exe -o page%1.csv -L -v -G "http://www.digikey.com/product-search/download.csv?FV=fff40008%2Cfff801b9&mnonly=0&newproducts=0&ColumnSort=0&page=%1&stock=0&pbfree=0&rohs=0&quantity=0&ptm=0&fid=0&pageSize=500" --digest --user-agent "Chrome/1.0"
+</code>
+The response has 4 bytes at the front we don't want, so a simple byteskip script or piece of code.
+<code>
+#include <stdio.h>
+#include <stdlib.h>
+int main(int argc,char*argv[])
+{
+	FILE *fp,*ofp;
+	if( argc < 4 ) {
+		fprintf(stderr,"%s usage : infile outfile offset\n",argv[0]);
+		exit(-1);
+	}
+	fp =fopen( argv[1],  "rb");
+	if( fp == NULL ) {
+		fprintf(stderr,"Couldnt open input file %s\n",argv[1]);
+		exit(-2);
+	}
+	unsigned long length ;
+	fseek(fp,0,SEEK_END);
+	length = ftell( fp ) ;
+	if( length == 0 ) {
+		fclose( fp );
+		fprintf(stderr,"zero length file %s\n",argv[1]);
+		exit(-3);
+	}
+	unsigned long offset;
+	//skip offset
+	offset = strtoul (argv[3], NULL, 0);
+	if( offset >= length ){
+		fclose( fp );
+		fprintf(stderr,"offset is  outside file length %s at %d\n",argv[1], offset);
+		exit(-5);
+	}
+	// set to skip position
+	fseek(fp,offset,SEEK_SET);
+	unsigned char *buffer = NULL;
+	buffer = (unsigned char *)malloc( length - offset );
+	if( buffer == NULL ) {
+		fclose(fp);
+		fprintf(stderr,"Couldnt allocate output buffer %lu\n", offset );
+		exit(-6);
+	}
+	// read whole buffer.
+	if( fread(buffer,1,length - offset ,fp ) != (length-offset) ) {
+		fclose(fp);
+		fprintf(stderr,"Couldnt allocate output buffer %lu\n", offset );
+		exit(-7);
+	}
+	// open output file for writing.
+	ofp = fopen( argv[2],  "wb");
+	if( ofp == NULL ) {
+		fclose(fp);
+		free( buffer );
+		buffer = NULL;
+		fprintf(stderr,"Couldnt open output file %s\n",argv[2]);
+		exit(-8);
+	}
+	if( fwrite(buffer,1,length-offset,ofp) != (length-offset) ) {
+		fclose(fp);
+		fclose(ofp);
+		fprintf(stderr,"Couldnt write output file %s\n", argv[2]);
+		exit(-9);
+	}
+	free( buffer );
+	fclose(fp);
+	fclose(ofp);
+	return 0;
+}
+</code>
+Process all the files.
+<code>
+for %a in (*.csv) do byteskip %a o%a 4
+</code>
+I used one of the online CSV to MYSQL converters, but most of them can't handle the variations in CSV. To create the initial schema for each table i converted one CSV to XLS by importing it into google docs, and then re-exporting it as an XLS then importing that into phpmyadmin, that makes the base schema.<br>
+Rename the table in phpmyadmin or via mysql tool
+Then do the final import with the csvtosql tool, (in progress)