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Paginate books

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Meutel 2016-12-30 16:16:00 +01:00
parent 8a6a0ba3ee
commit 927997d667
3 changed files with 19 additions and 9 deletions
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12
db.c
View File

@ -38,10 +38,10 @@ enum stmt {
static const char *const stmts[STMT__MAX] = {
/* STMT_BOOK */
"SELECT books.id AS id,title,series_index,name as series_name,series.id AS series_id FROM books LEFT OUTER JOIN books_series_link ON books.id = books_series_link.book LEFT OUTER JOIN series ON series.id = books_series_link.series WHERE books.id = ?",
/* STMT_BOOKS */ //TODO offset
"SELECT books.id AS id,title,series_index,name as series_name,series.id AS series_id FROM books LEFT OUTER JOIN books_series_link ON books.id = books_series_link.book LEFT OUTER JOIN series ON series.id = books_series_link.series ORDER BY id LIMIT ?",
/* STMT_BOOKS */
"SELECT books.id AS id,title,series_index,name as series_name,series.id AS series_id FROM books LEFT OUTER JOIN books_series_link ON books.id = books_series_link.book LEFT OUTER JOIN series ON series.id = books_series_link.series ORDER BY id LIMIT ? OFFSET ?",
/* STMT_BOOKS_AUTHORS */
"SELECT authors.id, authors.name, books_authors_link.book as book FROM authors, books_authors_link WHERE books_authors_link.author = authors.id AND books_authors_link.book IN ( SELECT id FROM books ORDER BY id LIMIT ? )",
"SELECT authors.id, authors.name, books_authors_link.book as book FROM authors, books_authors_link WHERE books_authors_link.author = authors.id AND books_authors_link.book IN ( SELECT id FROM books ORDER BY id LIMIT ? OFFSET ?)",
};
/*
@ -116,9 +116,9 @@ db_book_fill(Book *book, struct ksqlstmt *stmt)
}
int
db_books_load(struct kreq *r, BookAdv **books, int limit)
db_books_load(struct kreq *r, BookAdv **books, int limit, int offset)
{
if (limit < 0) {
if (limit < 0 || offset < 0) {
return 0;
}
struct ksqlstmt *stmt;
@ -131,6 +131,7 @@ db_books_load(struct kreq *r, BookAdv **books, int limit)
stmts[STMT_BOOKS],
STMT_BOOKS);
ksql_bind_int(stmt, 0, limit);
ksql_bind_int(stmt, 1, offset);
while (KSQL_ROW == ksql_stmt_step(stmt)) {
books[count] = kcalloc(1, sizeof(BookAdv));
db_book_fill(&books[count]->b,stmt);
@ -143,6 +144,7 @@ db_books_load(struct kreq *r, BookAdv **books, int limit)
stmts[STMT_BOOKS_AUTHORS],
STMT_BOOKS_AUTHORS);
ksql_bind_int(stmt, 0, limit);
ksql_bind_int(stmt, 1, offset);
while (KSQL_ROW == ksql_stmt_step(stmt)) {
// add author to list, link related book and increment asize
item = kcalloc(1, sizeof(struct bookauth));

2
extern.h
View File

@ -60,7 +60,7 @@ typedef struct
__BEGIN_DECLS
Book *db_book_load(struct kreq *r, int64_t id);
int db_books_load(struct kreq *r, BookAdv **books, int limit);
int db_books_load(struct kreq *r, BookAdv **books, int limit, int offset);
void db_book_free(Book *p);
void db_book_adv_free(BookAdv *p);

14
main.c
View File

@ -43,6 +43,8 @@ enum page {
enum key {
KEY_ID,
KEY_PAGE,
KEY_PERPAGE,
KEY__MAX
};
@ -55,6 +57,8 @@ static const char *const pages[PAGE__MAX] = {
static const struct kvalid keys[KEY__MAX] = {
{ kvalid_int, "id" }, /* KEY_ID */
{ kvalid_int, "page" }, /* KEY_PAGE */
{ kvalid_int, "perpage" }, /* KEY_PERPAGE */
};
/*
@ -130,8 +134,12 @@ sendbooks(struct kreq *r)
const char *errid;
int64_t id = -1;
Book *b = NULL;
int res, i = 0;
int res, i = 0, page = 1, per = 20;
if (NULL != r->fieldmap[KEY_PAGE])
page = r->fieldmap[KEY_PAGE]->parsed.i;
if (NULL != r->fieldmap[KEY_PERPAGE])
per = r->fieldmap[KEY_PERPAGE]->parsed.i;
if (NULL != r->fieldmap[KEY_ID])
id = r->fieldmap[KEY_ID]->parsed.i;
if (r->path[0] != '\0')
@ -149,8 +157,8 @@ sendbooks(struct kreq *r)
db_book_free(b);
} else {
kjson_array_open(&req);
BookAdv **books = kcalloc(200, sizeof(BookAdv));
res = db_books_load(r, books, 200);
BookAdv **books = kcalloc(per, sizeof(BookAdv));
res = db_books_load(r, books, per, per * (page-1));
while (i < res) {
Book b = books[i]->b;
putbook(&req, &b);