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最近搞mysql,这两天想用C把二进制文件(<64k,大的就存储路径了)存储到数据库里,经过我‘不懈’的搜索,发现NET上有且只有一个版本(php为例的),在C里根本行不通,我先是晕倒,醒了后我再搜索,还是php版本的,我又吐了一口血(之后又吐了好几次)!最后还是在mysql手册里找到了方向,是mysql_real_escape_string给了我光明,好了,不罗嗦了,不然要有矿泉水瓶砸过来了!为了不让其它初学者吐血,我把我的code共享一下,希望大侠们指正,也欢迎鸡蛋和西红柿:m01::m01::m01:
- #include <stdio.h>
- #include <mysql/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 "root"
- #define database "www"
-
- 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;
- off_t size;
- MYSQL *conn;
- MYSQL_RES *res_set;
- MYSQL_ROW row;
- MYSQL_FIELD *field;
- int i, flag;
- char *sql;
- FILE *fp;
- char *buf;
- int n=0;
- char *end;
- unsigned long *length;
-
- if (argc != 2) {
- printf("Usage: %s srcfile\n", argv[0]);
- exit(1);
- }
- filename = argv[1];
- if ((get_file_size(filename, &size)) == -1) {
- 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) {
- perror("fopen file" );
- exit(1);
- }
- if ((n = fread(buf, 1, size, fp)) < 0) { //n=*size
- 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);
- if (conn == NULL) {
- printf("init mysql, %s\n", mysql_error(conn));
- exit(1);
- }
- if ((mysql_real_connect(conn, host, username, password, database, 0, NULL, 0)) == NULL) {
- printf("connect mysql, %s\n", mysql_error(conn));
- exit(1);
- }
- strcpy(sql, "insert into www(id, name, file) values(5, 'peter', " );
- end = sql;
- end += strlen(sql); //point sql tail
- //convert NUL(ASCII 0)、'\n'、'\r'、'\'’、'''、'"'、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=5", 31)) != 0) {
- printf("insert failed, %s\n", mysql_error(conn));
- exit(1);
- }
- res_set = mysql_store_result(conn);
- fclose(fp);
- fp = NULL;
- fp = fopen("foo.bk", "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);
- }
- }
- fclose(fp);
- mysql_close(conn);
- free(sql);
- sql = NULL;
-
- return 0;
- }
- //gcc -o mysql_binary mysql_binary.c -lmysqlclient
- //usage: ./mysql_binary filename
复制代码
Makefile:
- CXX = gcc
- LIBS = -lmysqlclient
- PRODUCT = mysql_binary
- .LIBPATTERNS: lib%.so lib%.a
- vpath % .
- vpath %.c src
- vpath %.h include
- OBJS = mysql_binary.o
- $(PRODUCT): $(OBJS)
- $(CXX) $(OBJS) -o $@ $(LIBS)
- .c.o:
- .PHONY:clean
- clean:
- -rm -f $(OBJS) $(PRODUCT)
复制代码
好了,擦汗!
晕 这么多表情符号,弄一下。
生成的foo.bk文件为源文件的拷贝。
[ 本帖最后由 mike_chen 于 2007-4-13 09:01 编辑 ] |
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