《Mysql实例Mysql LONGTEXT 类型存储大文件(二进制也可以) (修改+调试+整理)》要点：

本文介绍了Mysql实例Mysql LONGTEXT 类型存储大文件(二进制也可以) (修改+调试+整理)，希望对您有用。如果有疑问，可以联系我们。#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

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

#include

#include

#include

#include

#include

#include

#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

{

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: