用c和mysql API写的简易操作mysql数据库的多线程服务器和客户端代码
此程序通过mysql API函数管理mysql数据库模仿远程管理mysql数据库，错误之处，还请指教！
服务器端：
/*gcc command: gcc -o mypthread_server mypthread_server.c query_api.c $(mysql_config --libs) $(mysql_config --cflags) -pthread*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/socket.h>
#include <pthread.h>
#include <arpa/inet.h>
#include <assert.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#define S_PORT 1234
#define LOG_NUM 10
#define MAXDATASIZE 1024
struct client_info{
int connfd;
struct sockaddr_in addr;
};
void* db_process(void* arg);
int main(int argc,char **argv)
{
int listenfd,connfd;
struct sockaddr_in server_addr,client_addr;
int sin_size;
pthread_t thread;
pthread_attr_t attr;
// if(listenfd= socket(AF_INET,SOCK_STREAM, 0)==-1){
if((listenfd = socket(AF_INET, SOCK_STREAM, 0)) == -1){
perror("creating socket failed!");
exit(-1);
}
/*设置socket属性，端口可以重用*/
int opt=SO_REUSEADDR;
setsockopt(listenfd,SOL_SOCKET,SO_REUSEADDR,&opt,sizeof(opt));
bzero(&server_addr,sizeof(server_addr));
server_addr.sin_family=AF_INET;
server_addr.sin_addr.s_addr=htonl(INADDR_ANY);
server_addr.sin_port=htons(S_PORT);
if(bind( listenfd , (struct sockaddr *)&server_addr, sizeof(struct sockaddr)) == -1){
perror("bind socket failed!");
exit(-1);
}
if(listen(listenfd,LOG_NUM)==-1){
perror("listen error!");
exit(-1);
}
sin_size=sizeof(struct sockaddr_in);
while(1){
struct client_info client;
//sin_size=sizeof(struct sockaddr_in);
//if(connfd=accept(listenfd,(struct sockaddr *)&client_addr,(socklen_t *)&sin_size)==-1){
if((connfd=accept(listenfd,(struct sockaddr *)&client_addr,(socklen_t *)&sin_size))==-1){
perror("accept error!");
exit(-1);
}
client.connfd=connfd;
client.addr=client_addr;
/*初始化属性值，均设为默认值*/
pthread_attr_init(&attr);
pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM);
/* 设置线程为分离属性*/
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
if(pthread_create(&thread,&attr,db_process,(void*)&client)){
perror("pthread_creat error!");
exit(-1);
}
}
close(listenfd);
}
void process_cli(int connectfd,struct sockaddr_in *client)
{
int num;
char recvbuf[MAXDATASIZE], sendbuf[MAXDATASIZE], cli_name[20];
printf("You got a connection from %s. ",inet_ntoa(client->sin_addr) );
num = recv(connectfd, cli_name, MAXDATASIZE,0);
if (num == 0) {
close(connectfd);
printf("Client disconnected./n");
return;
}
cli_name[num] = '/0';
printf("Client's name is %s./n",cli_name);
while (1){
//bzero(recvbuf,MAXDATASIZE);
num = recv(connectfd, recvbuf, MAXDATASIZE,0);
if (num == 0) {
close(connectfd);
printf("Client(%s) exit./n",cli_name);
return;
}
else if(num < 0){
//printf("recv error! %s : %s /n",errno,strerror(errno));
perror("recv!");
close(connectfd);
return;
}
recvbuf[num] = '/0';
//printf("num is %d/n",num);
printf("Received client( %s ) message: %s /n",cli_name, recvbuf);
fflush(stdout);
int i;
/*for (i = 0; i < num ; i++) {
sendbuf[i] = recvbuf[num - i -1];
//sendbuf[i] = recvbuf[i];
}*/
i=query(recvbuf,sendbuf);
if(i<0){
sprintf(sendbuf,"query error!./n");
}
//sendbuf[num] = '/0';
send(connectfd,sendbuf,strlen(sendbuf),0);
printf("return send:%s /n",sendbuf);
fflush(stdout);
//bzero(recvbuf,sizeof(recvbuf));
bzero(sendbuf,sizeof(sendbuf));
}
close(connectfd);
}
//接收数据并返回
void* db_process(void* arg)
{
struct client_info *info;
info=arg;
//printf("test........./n");
process_cli(info->connfd, &info->addr);
pthread_exit(NULL);
}
query_api.c:
#include <stdio.h>
#include <stdlib.h>
#include <mysql/mysql.h>
#include <string.h>
int query(char *command, char *buf) {
MYSQL *conn;
MYSQL_RES *res;
MYSQL_ROW row;
char *server = "localhost";
char *user = "cxt";
char *password = "cxt"; /* �˴��ij��������� */
char *database = "mysql";
conn = mysql_init(NULL);
/* Connect to database */
if (!mysql_real_connect(conn, server,
user, password, database, 0, NULL, 0)) {
fprintf(stderr, "%s/n", mysql_error(conn));
return -1;
}
int i,num_rows,num_fields;
char out[128]="";
char temp[128];
/* send SQL query */
if (mysql_query(conn, command)) {
fprintf(stderr, "�%s/n", mysql_error(conn));
return -1;
}
else{
res = mysql_use_result(conn);
if (res) // there are rows
{
num_fields = mysql_num_fields(res);
while ((row = mysql_fetch_row(res)) != NULL){
for(i=0;i<num_fields;i++){
sprintf(temp,"%s /t",row[i]);
strcat(out,temp);
bzero(temp,sizeof(temp));
}
sprintf(out,"%s /n",out);
strcat(buf,out);
bzero(out,sizeof(out));
}
// retrieve rows, then call mysql_free_result(result)
}
else // mysql_store_result() returned nothing; should it have?
{
if (mysql_errno(conn))
{
fprintf(stderr, "Error: %s/n", mysql_error(conn));
return -1;
}
else if (mysql_field_count(conn) == 0)
{
// query does not return data
// (it was not a SELECT)
num_rows = mysql_affected_rows(conn);
sprintf(buf,"Query success! %d row is effected!/n",num_rows);
}
}
}
/* close connection */
mysql_free_result(res);
mysql_close(conn);
return 0;
}
客户端：
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <sys/select.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#define MAXLINE 1024
char sendhead[MAXLINE];
int main(int argc , char* argv[])
{
int sockfd;
struct sockaddr_in servaddr;
char *info="cxt";
int maxfdp1, stdineof;
fd_set rset;
char recvbuf[MAXLINE],tmp[128],sendbuf[MAXLINE];
int n,len,fd;
if(argc!=3){
printf("useage:client address port ");
exit(0);
}
if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1 )
{
perror("socket");
exit(1);
}
printf("%s connect server/n",info);
bzero(&servaddr,sizeof(servaddr));
servaddr.sin_family=AF_INET;
servaddr.sin_port=htons(atoi(argv[2]));
inet_pton(AF_INET,argv[1],&servaddr.sin_addr);
if( ( connect(sockfd,(struct sockaddr*)&servaddr,sizeof(servaddr)) )<0)
{
perror("connect");
exit(1);
}
send(sockfd,info,strlen(info),0);
//FD_ZERO(&rset);
//FD_SET(sockfd, &rset);
//FD_SET(0, &rset);
//maxfdp1=sockfd+1;
for ( ; ; ) {
FD_ZERO(&rset);
FD_SET(sockfd, &rset);
FD_SET(0, &rset);
maxfdp1=sockfd+1;
if( ( select(maxfdp1, &rset, NULL, NULL, NULL) )<=0){
perror("select");
}else{
if (FD_ISSET(0,&rset)){
fgets(sendbuf, MAXLINE, stdin);
n=send(sockfd,sendbuf,strlen(sendbuf)-1,0);
if(n>0)
printf("send: %s",sendbuf);
else
printf("send: %s error,the erro cause is %s:%s/n",sendbuf,errno,strerror(errno));
bzero(sendbuf,strlen(sendbuf));
}
if (FD_ISSET(sockfd, &rset)) { /* socket is readable */
n=recv(sockfd, recvbuf, MAXLINE,0) ;
if(n<0) {
perror("str_cli: server terminated prematurely");
}else if(n==0)
{
printf("sever shutdown!");
exit(-1);
}
//recvbuf
recvbuf[n]='/0';
printf("receive :%s/n",recvbuf);
fflush(stdout);
bzero(recvbuf,strlen(recvbuf));
}
}
}
exit(0);
}