Linux平台下MongoDB的C語言編程執行個體
下面講述在Linux平台下MongoDB的C語言編程執行個體
假設已經安裝好了MongoDB。
1. 下載MongoDB的C語言驅動並安裝
這裡下載的MongoDB的C語言驅動是 mongo-c-driver-1.3.5.tar.gz。
解壓後開啟mongo-c-driver-1.3.5目錄下的 README 檔案,按其中講的方法安裝,如下:
# tar xzf mongo-c-driver-1.3.5.tar.gz
# cd mongo-c-driver-1.3.5
# ./configure
# make
# sudo make install
2. 啟動MongoDB
# mongod
2016-07-10T11:53:20.075+0800 I CONTROL [initandlisten] MongoDB starting : pid=3071 port=27017 dbpath=/data/db 64-bit host=localhost.localdomain
2016-07-10T11:53:20.076+0800 I CONTROL [initandlisten] db version v3.2.7
2016-07-10T11:53:20.076+0800 I CONTROL [initandlisten] git version: 4249c1d2b5999ebbf1fdf3bc0e0e3b3ff5c0aaf2
...
3. 編寫串連MongoDB的程式 test.c
#include <bson.h>
#include <bcon.h>
#include <mongoc.h>
int
main (int argc,
char *argv[])
{
mongoc_client_t *client;
mongoc_database_t *database;
mongoc_collection_t *collection;
bson_t *command,
reply,
*insert;
bson_error_t error;
char *str;
bool retval;
/*
* Required to initialize libmongoc's internals
*/
mongoc_init ();//初始化libmongoc驅動
/*
* Create a new client instance
*/
client = mongoc_client_new ("mongodb://localhost:27017");//建立連線物件
/*
* Get a handle on the database "db_name" and collection "coll_name"
*/
database = mongoc_client_get_database (client, "db_name");//擷取資料庫
collection = mongoc_client_get_collection (client, "db_name", "coll_name");//擷取指定資料庫和集合
/*
* Do work. This example pings the database, prints the result as JSON and
* performs an insert
*/
command = BCON_NEW ("ping", BCON_INT32 (1));
retval = mongoc_client_command_simple (client, "admin", command, NULL, &reply, &error);//執行命令
if (!retval) {
fprintf (stderr, "%s\n", error.message);
return EXIT_FAILURE;
}
str = bson_as_json (&reply, NULL);
printf ("%s\n", str);
insert = BCON_NEW ("hello", BCON_UTF8 ("world"));//欄位為hello,值為world字串
if (!mongoc_collection_insert (collection, MONGOC_INSERT_NONE, insert, NULL, &error)) {//插入文檔
fprintf (stderr, "%s\n", error.message);
}
bson_destroy (insert);
bson_destroy (&reply);
bson_destroy (command);
bson_free (str);
/*
* Release our handles and clean up libmongoc
*/
mongoc_collection_destroy (collection);//釋放表對象
mongoc_database_destroy (database);//釋放資料庫物件
mongoc_client_destroy (client);//釋放連線物件
mongoc_cleanup ();//釋放libmongoc驅動
return 0;
}4. 編譯 test.c
# gcc -o test test.c -I/usr/local/include/libmongoc-1.0 -I/usr/local/include/libbson-1.0/ -lmongoc-1.0 -lbson-1.0
# ls
test test.c
5. 運行test
# ./test
{ "ok" : 1 }
串連MongoDB成功!
更多MongoDB相關教程見以下內容:
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《MongoDB 權威指南》(MongoDB: The Definitive Guide)英文文字版[PDF]
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MongoDB 的詳細介紹:請點這裡
MongoDB 的:請點這裡
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