#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LONGTE
#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 复制代码 代码如下: //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: 
