apt-get install libmysqlclient-dev

mysql 使用的是xampp 需要指定sock

源碼：main.c

#if defined(_WIN32) || defined(_WIN64) //為了支持windows平臺上的編譯 #include <windows.h> #endif #include <stdio.h> #include <stdlib.h> #include <mysql/mysql.h> //我的機器上該文件在/usr/local/include/mysql下//定義數據庫操作的宏，也可以不定義留著后面直接寫進代碼 #define SELECT_QUERY "select username from test where userid = %d"int main(int argc, char **argv) //char **argv 相當于 char *argv[] {MYSQL mysql,*sock; //定義數據庫連接的句柄，它被用于幾乎所有的MySQL函數MYSQL_RES *res; //查詢結果集，結構類型MYSQL_FIELD *fd ; //包含字段信息的結構MYSQL_ROW row ; //存放一行查詢結果的字符串數組char qbuf[160]; //存放查詢sql語句字符串if (argc != 2) { //檢查輸入參數fprintf(stderr,"usage : mysql_select <userid>\n\n");exit(1);}mysql_init(&mysql);if (!(sock = mysql_real_connect(&mysql,"localhost","root","","test",3306, "/opt/lampp/var/mysql/mysql.sock" ,0))) {fprintf(stderr,"Couldn't connect to engine!\n%s\n\n",mysql_error(&mysql));perror("");exit(1);}sprintf(qbuf,SELECT_QUERY,atoi(argv[1]));if(mysql_query(sock,qbuf)) {fprintf(stderr,"Query failed (%s)\n",mysql_error(sock));exit(1);}if (!(res=mysql_store_result(sock))) {fprintf(stderr,"Couldn't get result from %s\n", mysql_error(sock));exit(1);}printf("number of fields returned: %d\n",mysql_num_fields(res));while (row = mysql_fetch_row(res)) {printf("Ther userid #%d 's username is: %s\n", atoi(argv[1]),(((row[0]==NULL)&&(!strlen(row[0]))) ? "NULL" : row[0])) ; puts( "query ok !\n" ) ; } mysql_free_result(res);mysql_close(sock);exit(0);return 0; //. 為了兼容大部分的編譯器加入此行 }

編譯：

gcc -o mysql_select ./main.c -lmysqlclient

?

---

?

簡單類封裝

?test.sql ??

mysql>use test;

mysql>source ~/test.sql; DROP TABLE IF EXISTS `test`; /*!40101 SET @saved_cs_client = @@character_set_client */; /*!40101 SET character_set_client = utf8 */; CREATE TABLE `test` (`id` int(11) NOT NULL AUTO_INCREMENT,`value` text,PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=latin1; /*!40101 SET character_set_client = @saved_cs_client */;-- -- Dumping data for table `test` -- LOCK TABLES `test` WRITE; /*!40000 ALTER TABLE `test` DISABLE KEYS */; INSERT INTO `test` VALUES (1,'hxl'),(2,'sqlite'),(3,'test'),(4,'for'),(5,'linux'); /*!40000 ALTER TABLE `test` ENABLE KEYS */; UNLOCK TABLES; /*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;/*!40101 SET SQL_MODE=@OLD_SQL_MODE */; /*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */; /*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */; /*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */; /*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */; /*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */; /*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;-- Dump completed on 2012-07-02 23:52:14

?

main.cc

#include <cstdlib> #include <fstream> #include <iomanip> #include <iostream> extern "C" { #include <mysql/mysql.h> #include <string.h>} using namespace std;class MyDb {private:MYSQL mysql,*sock; //定義數據庫連接的句柄，它被用于幾乎所有的MySQL函數MYSQL_RES *res; //查詢結果集，結構類型MYSQL_FIELD *fd ; //包含字段信息的結構MYSQL_ROW row ; //存放一行查詢結果的字符串數組public:MyDb(){cout<<"nothing"<<endl;}MyDb(char *ip, char *user, char *passwd, char *db_name, int port, char *socket){mysql_init(&mysql);if (!(sock = mysql_real_connect(&mysql, ip, user, passwd, db_name, port, socket ,0))) {fprintf(stderr,"Couldn't connect to engine!\n%s\n\n",mysql_error(&mysql));perror("");exit(1);}}~MyDb(){mysql_free_result(res);mysql_close(sock); cout<<"connect destoryed"<<endl;}void get(char *str){if(mysql_query(sock,str)) {fprintf(stderr,"Query failed (%s)\n",mysql_error(sock));exit(1);}if (!(res=mysql_store_result(sock))) {fprintf(stderr,"Couldn't get result from %s\n", mysql_error(sock));exit(1);}printf("number of fields returned: %d\n",mysql_num_fields(res));while (row = mysql_fetch_row(res)) {printf("Ther username is: %s\n",(((row[0]==NULL)&&(!strlen(row[0]))) ? "NULL" : row[0])) ; puts( "query ok !" ) ; } } };int main ( int argc, char *argv[] ) {MyDb test("localhost","root","","test", 3306,"/opt/lampp/var/mysql/mysql.sock");test.get("select value from test where id = 1");return EXIT_SUCCESS; } // ---------- end of function main ----------

?

?

編譯：

g++ -g -o mysql_select ./mysql.cc -lmysqlclient

?

完

轉載于:https://www.cnblogs.com/wangkangluo1/archive/2012/07/01/2571800.html

總結

以上是生活随笔為你收集整理的c 连接mysql的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。