bouquins-bchs/db.c

/*	$Id$ */
/*
 * Copyright (c) 2016 Kristaps Dzonsons <kristaps@bsd.lv>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include <kcgi.h>
#include <kcgijson.h>
#include "ksql.h"

#include "extern.h"

enum    stmt {
    STMT_BOOK,
    STMT_BOOKS,
    STMT__MAX
};

static const char *const stmts[STMT__MAX] = {
  /* STMT_BOOK */
  "SELECT books.id AS id,title FROM books WHERE books.id = ?",
  /* STMT_BOOKS */
  "SELECT books.id AS id,title FROM books LIMIT ?",
};

int
db_books_load(struct kreq *r, struct book **books, int limit)
{
  if (limit < 0) {
    return 0;
  }
  struct ksqlstmt *stmt;
  int i = 0;
  ksql_stmt_alloc(r->arg, &stmt, 
            stmts[STMT_BOOKS], 
            STMT_BOOKS);
  ksql_bind_int(stmt, 0, limit);
  while (KSQL_ROW == ksql_stmt_step(stmt)) {
    books[i] = kcalloc(1, sizeof(struct book));
    books[i]->id = ksql_stmt_int(stmt, 0);
    books[i]->title = kstrdup(ksql_stmt_str(stmt, 1));
    i++;
  }
  ksql_stmt_free(stmt);
  return i;
}

struct book *
db_book_load(struct kreq *r, int64_t id)
{
  struct ksqlstmt *stmt;
  struct book   *book;
  ksql_stmt_alloc(r->arg, &stmt, 
            stmts[STMT_BOOK], 
            STMT_BOOK);
  ksql_bind_int(stmt, 0, id);
  if (KSQL_ROW != ksql_stmt_step(stmt)) {
    ksql_stmt_free(stmt);
    return(NULL);
  }
  book = kcalloc(1, sizeof(struct book));
  book->id = ksql_stmt_int(stmt, 0);
  book->title = kstrdup(ksql_stmt_str(stmt, 1));
  ksql_stmt_free(stmt);
  return book;
}


/*
 * Open the database and stash the resulting handle in the d
 */
int
db_open(struct kreq *r, const char *file)
{
	struct ksqlcfg	 cfg;
	struct ksql	*sql;

	/* Configure normal database except with foreign keys. */

	memset(&cfg, 0, sizeof(struct ksqlcfg));
	cfg.flags = KSQL_EXIT_ON_ERR |
		    KSQL_FOREIGN_KEYS |
		    KSQL_SAFE_EXIT;
	cfg.err = ksqlitemsg;
	cfg.dberr = ksqlitedbmsg;

	/* Allocate database. */

	if (NULL == (sql = ksql_alloc(&cfg)))
		return(0);

	ksql_open(sql, file);
	r->arg = sql;
	return(1);
}

/*
 * Close the database stashed in the kreq's argument.
 */
void
db_close(struct kreq *r)
{

	ksql_free(r->arg);
	r->arg = NULL;
}