Mysql LONGTEXT 类型存储大文件(二进制也可以) (修改+调试+整理)

#include "stdafx.h"
//是前一篇的姊妹篇
//代码来自网络，我学习整理了一下，测试通过，下面的参数
//需要设置为你自己的
//在DBMS中线要创建数据库www，table www，file字段数据类型用LONGTEXT即可测试
//测试文件c:\\test.iso，你可以找任何一个文件修改为即可，我找的是一个exe程序，修改为test.iso而已
//最大测试过加入文件大小为650M(一个正真的iso文件)
//注意：还要修改my.ini文件中的max_allowed_packet字段，我设置的是

//max_allowed_packet = 1024M 
//#define host "localhost" //mysql server 
//#define username "root" 
//#define password "674800" 
//#define database "test" 
//int port = 3306; 
#include <Winsock2.h> 
#include <stdio.h> 
#include <mysql.h> 
#include <stdlib.h> 
#include <sys/types.h> 
#include <sys/stat.h> 
#include <fcntl.h> 
#define host "localhost" //mysql server 
#define username "root" 
#define password "674800" 
#define database "www" 
int port = 3306; 
#pragma comment(lib,"libmysql.lib") 
//得到文件的大小(字节数) 
int get_file_size(char *path, off_t *size) 
{ 
struct stat file_stats; 
if(stat(path, &file_stats)) 
return -1; 
*size = file_stats.st_size; 
return 0; 
} 
int main(int argc, char *argv[]) 
{ 
char *filename=NULL; 
off_t size; 
MYSQL *conn=NULL; 
MYSQL_RES *res_set=NULL; 
MYSQL_ROW row; 
MYSQL_FIELD *field=NULL; 
int i, flag; 
char *sql; //sql语句 
FILE *fp; 
char *buf; 
int n=256; 
char *end; 
unsigned long *length; 
/* if (argc != 2) 
{ 
printf("Usage: %s srcfile\n", argv[0]); 
exit(1); 
} 
*/ 
filename = "c:\\test.iso"; 
if ((get_file_size(filename, &size)) == -1) //得到文件的大小 
{ 
perror("get file size" ); 
exit(1); 
} 
if ((buf = (char *)malloc(sizeof(char)*(size+1))) == NULL) 
{ 
perror("malloc buf" ); 
exit(1); 
} 
if ((fp = fopen(filename, "rb" )) == NULL) //读文件 
{ 
perror("fopen file" ); 
exit(1); 
} 
if ((n = fread(buf, 1, size, fp)) < 0) //读文件失败 
{ 
perror("fread file" ); 
exit(1); 
} 
sql = (char *)malloc(sizeof(char)*n*2+256); //2n+1+strlen(other sql) 
if (sql == NULL) 
{ 
perror("malloc sql" ); 
exit(1); 
} 
conn = mysql_init(NULL);//生产一个mysql对象 
if (conn == NULL) 
{ 
printf("init mysql, %s\n", mysql_error(conn)); 
exit(1); 
} 
if ((mysql_real_connect(conn, host, username, password, database, port, NULL, 0)) == NULL) //连接服务器 
{ 
printf("connect mysql, %s\n", mysql_error(conn)); 
exit(1); 
} 
strcpy(sql, "insert into www(id, name, file) values(NULL, 'peter', " ); 
end = sql; 
end += strlen(sql); //point sql tail 
//convert NUL(ASCII 0)、'\n'、'\r'、'\''、'''、'"'和Control-Z and so on 
*end++ = '\''; 
end += mysql_real_escape_string(conn, end, buf, n); 
*end++ = '\''; 
*end++ = ')'; 
flag = mysql_real_query(conn, sql, (unsigned int)(end-sql)); 
if (flag != 0) 
{ 
printf("insert failed, %s\n", mysql_error(conn)); 
exit(1); 
} 
if ((mysql_real_query(conn, "SELECT file FROM www where id=1", 31)) != 0) 
{ 
printf("insert failed, %s\n", mysql_error(conn)); 
exit(1); 
} 
res_set = mysql_store_result(conn); 
fclose(fp); 
fp = NULL; 
fp = fopen("c:\\123.iso", "wb" ); 
while ((row = mysql_fetch_row(res_set)) != NULL) 
{ 
length = mysql_fetch_lengths(res_set); 
for (i=0; i<mysql_num_fields(res_set); i++) 
{ 
fwrite(row[0], 1, length[0], fp); 
//printf("%s\n",row[0]); 
} 
} 
fclose(fp); 
mysql_close(conn); 
free(sql); 
free(buf); 
sql = NULL; 
return 0; 
}

运行结果: