apache module with sqlite

/* Include the required headers from httpd */
#include "httpd.h"
#include "http_core.h"
#include "http_protocol.h"
#include "http_request.h"
#include "uuid/uuid.h"
#include "sqlite3.h"

/* Define prototypes of our functions in this module */
static void register_hooks(apr_pool_t *pool);
static int example_handler(request_rec *r);
static int callback(void *NotUsed, int argc, char **argv, char **azColName);

/* Define our module as an entity and assign a function for registering hooks  */
request_rec *rg = NULL;
module AP_MODULE_DECLARE_DATA   example_module =
{
    STANDARD20_MODULE_STUFF,
    NULL,            // Per-directory configuration handler
    NULL,            // Merge handler for per-directory configurations
    NULL,            // Per-server configuration handler
    NULL,            // Merge handler for per-server configurations
    NULL,            // Any directives we may have for httpd
    register_hooks   // Our hook registering function
};


/* register_hooks: Adds a hook to the httpd process */
static void register_hooks(apr_pool_t *pool)
{

    /* Hook the request handler */
    ap_hook_handler(example_handler, NULL, NULL, APR_HOOK_LAST);
}

static int callback(void *NotUsed, int argc, char **argv, char **azColName) {
    int i;
    printf("\n callback");
    for (i = 0; i < argc; i++) {
        //printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
        ap_rputs(azColName[i],rg);
        ap_rputs(argv[i],rg);
    }
    printf("\n");
    return 0;
}

/* The handler function for our module.
 * This is where all the fun happens!
 */

static int example_handler(request_rec *r)
{
    /* First off, we need to check if this is a call for the "example" handler.
     * If it is, we accept it and do our things, it not, we simply return DECLINED,
     * and Apache will try somewhere else.
     */
    if (!r->handler || strcmp(r->handler, "example-handler")) return (DECLINED);

    // The first thing we will do is write a simple "Hello, world!" back to the client.
    ap_rputs("Hello, world!<br/>", r);
     rg =r;
    uuid_t uuid;

    // generate
    uuid_generate_time_safe(uuid);

    // unparse (to string)
    char uuid_str[37];      // ex. "1b4e28ba-2fa1-11d2-883f-0016d3cca427" + "\0"
    uuid_unparse_lower(uuid, uuid_str);
   // printf("generate uuid=%s\n", uuid_str);

    ap_rputs(uuid_str,r);

    int rc;
    char *pStrSql;
    sqlite3* db;
    char *zErrMsg;
    rc = sqlite3_open("a.db", &db);
    if (rc) {
        //        printf("\nCant open db ");
         ap_rputs("\nCant open db",r);
        exit(0);
    } else {
        //fprintf(stdout, "Opened database successfully\n");
        ap_rputs("\nDatabase opened succesfully",r);
    }

    pStrSql = "CREATE TABLE employee (name text,age int);";

    rc = sqlite3_exec(db, pStrSql, callback, 0, &zErrMsg);
    if (rc != SQLITE_OK) {

        ap_rputs(zErrMsg,r);
        sqlite3_free(zErrMsg);

    } else {
        ap_rputs("\nTable created successfully",r);
    }

    pStrSql = "INSERT INTO employee VALUES ('prakash',23);"\
    "INSERT INTO employee VALUES ('dravid',41);" \
    "INSERT INTO employee VALUES ('sourav',41);" \
    "INSERT INTO employee VALUES ('sachin',40);"\
    "INSERT INTO employee VALUES ('Some one',23);";

    rc = sqlite3_exec(db, pStrSql, callback, 0, &zErrMsg);
    if (rc != SQLITE_OK) {
         ap_rputs(zErrMsg,r);
        sqlite3_free(zErrMsg);
    } else {
        ap_rputs("Records created succefulyy",r);
    }



    return OK;
}