最近搞mysql，這兩天想用C把二進制文件（<64k，大的就存儲路徑了）存儲到數據庫裡，經過我‘不懈’的搜索，發現NET上有且只有一個版本（PHP為例的），在C裡根本行不通，我先是暈倒，醒了後我再搜索，還是php版本的，我又吐了一口血（之後又吐了好幾次）！最後還是在mysql手冊裡找到了方向，是mysql_real_escape_string給了我光明，好了，不羅嗦了，不然要有礦泉水瓶砸過來了！為了不讓其它初學者吐血，我把我的code共享一下，希望大俠們指正，也歡迎雞蛋和西紅柿
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#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 "cipher"#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'、'\'’、'''、'"'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=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 filenameMakefile：
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CXX = gccLIBS = -lmysqlclientPRODUCT = mysql_binary.LIBPATTERNS: lib%.so lib%.avpath % .vpath %.c srcvpath %.h includeOBJS = mysql_binary.o$(PRODUCT): $(OBJS) $(CXX) $(OBJS) -o $@ $(LIBS).c.o:.PHONY:cleanclean: -rm -f $(OBJS) $(PRODUCT)好了，擦汗！暈 這麼多表情符號，弄一下。生成的foo.bk文件為源文件的拷貝。
