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mnoGoSearch 3.3.12 reference manual: Full-featured search engine software
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UdmFind2

Name

UdmFind2 -- Executes a search query

Description

UDM_RESULT* UdmFind2(UDM_AGENT* Agent, const char* query);

Executes a search query in the search session, pointed by the Agent variable, and returns search results.

Parameters

Agent

Pointer to a variable of type UDM_AGENT, should be the address of an existing variable of UDM_AGENT type.

query

Search query, using the same format with search.cgi QUERY_STRING described in the Section called Search parameters in Chapter 10.

Return Values

A pointer to an allocated variable of UDM_RESULT type, or NULL on error.

Notes

UdmFind2() can fail if the search session could not open a connection to the database specified by the DBAddr command, or if some of the SQL queries which were sent to the database returnd on error.

Examples

Example 1. UdmFind2 example


UDM_RESULT *Res;

if (!(Res= UdmFind2(Agent, "q=search+words&ps=10"))
{
  printf('Error: UdmFind2 failed');
  exit(1);
}

    

Example 2. UdmFind2 - a complete search application example


#include <stdio.h>
#include <udmsearch.h>


int main(int ac, char **av)
{
  UDM_ENV Env;
  UDM_AGENT Agent;
  UDM_RESULT *Res;
  size_t row;
  char query[256];
  
  if (ac < 2)
  {
    printf("Usage: %s query\n", av[0]);
    exit(1);
  }
  
  if (!UdmEnvInit(&Env) ||
      !UdmAgentInit(&Agent, &Env, 0))
    goto err;
  
  if (UDM_OK != UdmAgentAddLine(&Agent, "DBAddr mysql://root@localhost/msdn33/"))
    goto err;
  
  udm_snprintf(query, sizeof(query), "q=%s", av[1]);
  if (!(Res= UdmFind2(&Agent, query)))
    goto err;
  
  printf("Documents %d-%d from %d total found\n", Res->first, Res->last, Res->total_found);
  for (row= 0; row < Res->num_rows; row++)
  {
    UDM_DOCUMENT *Doc= &Res->Doc[row];
    printf("ResultNo: %d\n", UdmVarListFindInt(&Doc->Sections, "Order", 0));
    printf("ID      : %d\n", UdmVarListFindInt(&Doc->Sections, "ID", 0));
    printf("Size    : %d bytes\n", UdmVarListFindInt(&Doc->Sections, "Content-Length", 0));
    printf("Type    : '%s'\n", UdmVarListFindStr(&Doc->Sections, "Content-Type", ""));
    printf("Title   : '%s'\n", UdmVarListFindStr(&Doc->Sections, "title", ""));
    printf("Body    : '%s'\n", UdmVarListFindStr(&Doc->Sections, "body", ""));
    printf("\n");
  }
  UdmResultFree(Res);
  
  UdmAgentFree(&Agent);
  UdmEnvFree(&Env);
  
  return 0;
  
err:
  fprintf(stderr, "Error: '%s'\n", UdmEnvErrMsg(&Env));
  return 1;
}


    

Example 3. Makefile example


CFLAGS=-I/usr/local/mnogosearch/include -Wall
LDFLAGS=-L/usr/local/mnogosearch/lib -lmnogosearch -Wl,--rpath -Wl,/usr/local/mnogosearch/lib

CC=gcc
all: search

search.o: search.c
        $(CC) $(CFLAGS) -c search.c -o search.o
        
search: search.o
        $(CC) $(LDFLAGS) search.o -o search
                
clean:
        rm -rf search search.o

    

See Also

UdmEnvInit
UdmEnvFree
UdmAgentFree
the Section called Search parameters in Chapter 10