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August 5, 2018 13:08
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Groonga Cライブラリ テーブルのレコード参照(https://qiita.com/msh5/items/90dbf582ae2b30ec3f11)
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#include <stdio.h> | |
#include <string.h> | |
#include <assert.h> | |
#include <groonga/groonga.h> | |
#define TABLE_NAME "table" | |
int main (int argc, char **argv) { | |
// ライブラリを初期化 | |
assert(grn_init() == GRN_SUCCESS); | |
// コンテキストを取得 | |
grn_ctx *ctx = grn_ctx_open(0); | |
assert(ctx != NULL); | |
// データベースを作成 | |
grn_obj *db = grn_db_create(ctx, NULL, NULL); | |
assert(db != NULL); | |
// テーブルを作成 | |
grn_obj *short_text_type = grn_ctx_at(ctx, GRN_DB_SHORT_TEXT); | |
assert(short_text_type != NULL); | |
grn_obj *table = grn_table_create(ctx, TABLE_NAME, strlen(TABLE_NAME), NULL, | |
GRN_OBJ_TEMPORARY | GRN_OBJ_TABLE_HASH_KEY, | |
short_text_type, NULL); | |
assert(table != NULL); | |
// レコードを作成 | |
grn_id record_id = grn_table_add(ctx, table, "test_record", strlen("test_record"), NULL); | |
assert(record_id != GRN_ID_NIL); | |
// 主キー値によるレコードIDの取得 | |
assert(grn_table_get(ctx, table, "test_record", strlen("test_record")) == record_id); | |
// レコードIDによる主キー値の取得 | |
char keybuf[16]; | |
int keylen = grn_table_get_key(ctx, table, record_id, keybuf, 16); | |
assert(keylen == strlen("test_record")); | |
assert(strncmp("test_record", keybuf, keylen) == 0); | |
// テーブルカーソルによる巡回参照 | |
grn_table_cursor *table_cursor = grn_table_cursor_open(ctx, table, NULL, 0, NULL, 0, 0, -1, | |
GRN_CURSOR_BY_ID | GRN_CURSOR_ASCENDING); | |
assert(table_cursor != NULL); | |
assert(grn_table_cursor_next(ctx, table_cursor) == record_id); | |
// レコードの巡回が完了した | |
assert(grn_table_cursor_next(ctx, table_cursor) == GRN_ID_NIL); | |
assert(grn_table_cursor_close(ctx, table_cursor) == GRN_SUCCESS); | |
// リソースを破棄 | |
grn_obj_unlink(ctx, table); | |
grn_obj_unlink(ctx, db); | |
assert(grn_ctx_close(ctx) == GRN_SUCCESS); | |
// ライブラリを終了する | |
assert(grn_fin() == GRN_SUCCESS); | |
} |
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