Listing 2. Basic C API Example

#include <string.h>
#include "sqlite.h"

int callback( void *p_data, int num_fields, 
              char **p_fields, char **p_col_names);

void main()
{
    int ret;
    int nrecs = 0;
    char *errmsg;

    /* Open the database. */
    sqlite* p_db = sqlite_open("./db", 0777, 0);

    if(p_db == 0)
    {
        printf("Could not open database.");
        exit(1);
    }

    /* Select everything from the person table. */
    ret = sqlite_exec( p_db, 
                   "SELECT * from person limit 10;",
                   callback,
                   &nrecs,
                   errmsg);
    
    if(ret!=SQLITE_OK)
    {
        printf("Error on SELECT: %s.\n", errmsg);
    }
    else
    {
        printf("Retrieved %i records.\n", nrecs);
    }

    /* Delete everything from the person table. */
    sqlite_exec( p_db, 
                 "DELETE * FROM person", 0,0,0);

    /* On second thought, don't. */
    sqlite_exec(p_db, "ROLLBACK", 0, 0, 0);

    /* Close the database. */
    sqlite_close(p_db);
}

int callback( void *p_data, int num_fields, 
              char **p_fields, char **p_col_names)
{
    int i;
    int *p_rn = (int*)p_data;
    (*p_rn)++;

    /* Print the field values. */
    for(i=0; i < num_fields; i++)
    {
        printf("%s | " p_fields[i]);
    }

    return 0;
}