MySQL LONGBLOB 类型存储二进制数据 (修改+调试+整理)

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在DBMS中线要创建数据库test，table bintest，data字段数据类型用LONGBLOB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; 
// Mysql3.cpp : Defines the entry point for the console application. 
// 
#include "stdafx.h" 
#include <Winsock2.h> 
#include <mysql.h> 
#include <string.h> 
#include <stdio.h> 
#include <stdlib.h> 
#include <sys/types.h> 
#include <sys/stat.h> 
#include <fcntl.h> 
#pragma comment(lib,"libmysql.lib") 
#define INSERT_QUERY "INSERT INTO bintest(id, data) VALUES(NULL, ?)" 
#define host "localhost" //mysql server 
#define username "root" 
#define password "674800" 
#define database "test" 
int port = 3306; 
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; 
} 
void test() 
{ 
MYSQL_BIND bind[1]; 
unsigned long length; 
char* pos = NULL; 
off_t size; 
FILE* fp; 
char* 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 ((pos = (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 ((fread(pos, 1, size, fp)) < 0) //读文件失败 
{ 
perror("fread file" ); 
exit(1); 
} 
MYSQL *mysql = mysql_init(NULL); //mysql 初始化 
if (!mysql) 
return; 
if (!mysql_real_connect(mysql,host,username,password,"test",port,NULL,0))//链接服务器 
{ 
int ret = mysql_errno(mysql); 
mysql_close(mysql); 
return; 
} 
MYSQL_STMT *stmt = mysql_stmt_init(mysql); 
if (!stmt) 
{ 
fprintf(stderr, " mysql_stmt_init(), out of memory\n"); 
exit(0); 
} 
if (mysql_stmt_prepare(stmt, INSERT_QUERY, strlen(INSERT_QUERY))) 
{ 
fprintf(stderr, "\n mysql_stmt_prepare(), INSERT failed"); 
fprintf(stderr, "\n %s", mysql_stmt_error(stmt)); 
exit(0); 
} 
memset(bind, 0, sizeof(bind)); 
//bind[0].buffer_type= MYSQL_TYPE_STRING; 
//bind[0].buffer_type = MYSQL_TYPE_LONG; 
bind[0].buffer = pos; 
//bind[0].buffer_type = MYSQL_TYPE_TINY; 
bind[0].buffer_type = MYSQL_TYPE_BLOB; 
bind[0].length= &length; 
bind[0].is_null= 0; 
/* Bind the buffers */ 
if (mysql_stmt_bind_param(stmt, bind)) 
{ 
fprintf(stderr, "\n param bind failed"); 
fprintf(stderr, "\n %s", mysql_stmt_error(stmt)); 
exit(0); 
} 
int rc =0; 
/* Supply data in chunks to server */ 
if (mysql_stmt_send_long_data(stmt,0, pos, size)) 
{ 
fprintf(stderr, "\n send_long_data failed"); 
fprintf(stderr, "\n %s", mysql_stmt_error(stmt)); 
exit(0); 
} 
// pos += size; 
/* Supply the next piece of data */ 
if (mysql_stmt_send_long_data(stmt,0, pos, size)) 
{ 
fprintf(stderr, "\n send_long_data failed"); 
fprintf(stderr, "\n %s", mysql_stmt_error(stmt)); 
exit(0); 
} 
/* Now, execute the query */ 
if (mysql_stmt_execute(stmt)) 
{ 
fprintf(stderr, "\n mysql_stmt_execute failed"); 
fprintf(stderr, "\n %s", mysql_stmt_error(stmt)); 
exit(0); 
} 
} 
int main() 
{ 
test(); 
//sleep(1); 
return 0; 
} 

运行结果:

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关键词：MYSQL