On Feb 27, 2008, at 4:48 PM, Mike McGonagle wrote:
> Hello all,
> I was hoping that someone might share some tips on working with
> Blobs? I
> would like to be able to store some images and sound files in a
> database,
> but never having dealt with them, I am kind of at a loss for some
> examples.
> I have looked on the web, and there are few examples that were of use.
Well, I wrote a quick and dirty program for stuffing image files into
a database. You just provide a directory and it stats() each file,
allocates enough space for the image data, then loads it from disk.
Sql statement is something like:
char* sql = "insert into i (name, data) values (?, ?);";
Of course if your images are huge this method coud be problematic. I
believe SQLite supports an incremental way to do this but I haven't
looked at those calls yet.
while ( (dentry = readdir(dir)) != '\0') {
if (dentry->d_name[0] == '.')
continue;
if (fd != -1) {
close(fd);
fd = -1;
}
if (data != '\0') {
free(data);
data = '\0';
}
snprintf(fname, sizeof(fname), "%s/%s", newdir, dentry->d_name);
stat(fname, &sb);
if ( (data = malloc(sb.st_size)) == '\0') {
fprintf(stderr, "malloc() failed\n");
sqlite3_finalize(stmt);
sqlite3_close(db);
exit(1);
}
if ( (fd = open(fname, O_RDONLY, 0000)) == -1) {
fprintf(stderr, "open() failed\n");
sqlite3_finalize(stmt);
sqlite3_close(db);
exit(1);
}
if ( (retval = read(fd, data, sb.st_size)) == -1) {
fprintf(stderr, "read() failed\n");
sqlite3_finalize(stmt);
sqlite3_close(db);
exit(1);
}
if (retval != sb.st_size) {
fprintf(stderr, "read() failed\n");
sqlite3_finalize(stmt);
sqlite3_close(db);
exit(1);
}
rc = sqlite3_bind_text(stmt, 1, dentry->d_name, dentry->d_namlen,
SQLITE_STATIC);
if (rc != SQLITE_OK) {
fprintf(stderr, "sqlite3_bind_text() %s\n", sqlite3_errmsg
(db));
sqlite3_finalize(stmt);
sqlite3_close(db);
exit(1);
}
rc = sqlite3_bind_blob(stmt, 2, data, sb.st_size, SQLITE_STATIC);
if (rc != SQLITE_OK) {
fprintf(stderr, "sqlite3_bind_blob() %s\n", sqlite3_errmsg
(db));
sqlite3_finalize(stmt);
sqlite3_close(db);
exit(1);
}
rc = sqlite3_step(stmt);
if (rc != SQLITE_DONE) {
fprintf(stderr, "sqlite3_step() %s\n", sqlite3_errmsg(db));
sqlite3_finalize(stmt);
sqlite3_close(db);
exit(1);
}
sqlite3_reset(stmt);
}
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