c语言连接数据库mysql

下面是C语言连接mysql数据库简单例子：

编译方式：

gcc -I /usr/local/mysql/include/ -L /usr/local/mysql/lib/ -l mysqlclient select.c -o select

源码：

#include

#include

#include

#include "/usr/local/mysql/include/mysql.h"

int main() {

MYSQL *conn;

MYSQL_RES *res;

MYSQL_ROW row;

char *server = "192.168.1.99";

char *user = "test";

char *password = "test_passwd";

char *database = "count";

double tvalue1 = 0.93;

char st[123];

time_t s;

s = time((time_t*)NULL );

sprintf(st, "%d", s);

conn = mysql_init(NULL);

if (!mysql_real_connect(conn, server, user, password, database, 0, NULL, 0)) {

fprintf(stderr, "%s\n", mysql_error(conn));

exit(1);

}

char sql[1024]="SELECT * FROM money_change WHERE c_datetime <= ";

strcat(sql,st);

strcat(sql,"-3000 AND c_datetime > ");

strcat(sql,st);

strcat(sql,"-5000 AND c_type = 0 UNION ALL SELECT * FROM money_change WHERE

c_datetime <= ");

strcat(sql,st);

strcat(sql," AND c_datetime > ");

strcat(sql,st);

strcat(sql,"-3600 ORDER BY c_type");

printf("%s\n",sql);

if (mysql_query(conn, sql)) {

fprintf(stderr, "%s\n", mysql_error(conn));

exit(1);

}

res = mysql_use_result(conn);

while ((row = mysql_fetch_row(res)) != NULL){

printf("c_goldnote\t=\t%9s\n",row[5]);

}

mysql_free_result(res);

mysql_close(conn);

}