July 2005
Intermediate to advanced
1032 pages
27h 10m
English
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Client 3—Simple Processing—PQexec() and PQprint()
Now let's turn our attention to the task of processing a query. I'll start by showing a simple example—you'll connect to a database, execute a hard-wired query, process the results, clean up, and exit.
1 /* 2 ** File: client3.c 3 */ 4 5 #include <stdlib.h> 6 #include <libpq-fe.h> 7 8 void process_query( PGconn * connection, const char * query_text ) 9 { 10 PGresult * result; 11 PQprintOpt options = {0}; 12 13 if(( result = PQexec( connection, query_text )) == NULL ) 14 { 15 printf( "%s\n", PQerrorMessage( connection )); 16 return; 17 } 18 19 options.header = 1; /* Ask for column headers */ 20 options.align = 1; /* Pad short columns for alignment */ 21 options.fieldSep = "|"; /* Use a pipe as ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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