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mysql2.cpp : Defines the entry point for the console application.
#include “stdafx.h”
//是前一篇的姊妹篇
//代碼來自網(wǎng)絡(luò)，我學(xué)習(xí)整理了一下，測試通過，下面的參數(shù)
//需要設(shè)置為你自己的
//在DBMS中線要?jiǎng)?chuàng)建數(shù)據(jù)庫www，table www，file字段數(shù)據(jù)類型用LONGTEXT即可測試
//測試文件c:test.iso，你可以找任何一個(gè)文件修改為即可，我找的是一個(gè)exe程序，修改為test.iso而已
//最大測試過加入文件大小為650M(一個(gè)正真的iso文件)
//注意：還要修改my.ini文件中的max_allowed_packet字段，我設(shè)置的是
代碼如下:
//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(字節(jié)數(shù))
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語句
FILE *fp;
char *buf;
int n=256;
char *end;
unsigned long *length;
/* if (argc != 2)
{
printf(“Usage: %s srcfile “, 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) //讀文件
{
perror(“fopen file” );
exit(1);
}
if ((n = fread(buf, 1, size, fp)) {
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);//生產(chǎn)一個(gè)mysql對(duì)象
if (conn == NULL)
{
printf(“init mysql, %s “, mysql_error(conn));
exit(1);
}
if ((mysql_real_connect(conn, host, username, password, database, port, NULL, 0)) == NULL) //連接服務(wù)器
{
printf(“connect mysql, %s “, 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)、’ ‘、’ ‘、”’、”’、'”‘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 “, mysql_error(conn));
exit(1);
}
if ((mysql_real_query(conn, “SELECT file FROM www where id=1”, 31)) != 0)
{
printf(“insert failed, %s “, 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 “,row[0]);
}
}
fclose(fp);
mysql_close(conn);
free(sql);
free(buf);
sql = NULL;
return 0;
}
運(yùn)行結(jié)果:
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