IOS SQLite 3画像の格納と読み出し
画像を保存
画像の読み込み
// Save Small Image Data by given main url
- (void) SaveImagesToSql: (NSData*) imgData :(NSString*) mainUrl
{
NSLog( @"
*****Save image to SQLite*****
" );
const char* sqliteQuery = "INSERT INTO IMAGES (URL, IMAGE) VALUES (?, ?)";
sqlite3_stmt* statement;
if( sqlite3_prepare_v2(articlesDB, sqliteQuery, -1, &statement, NULL) == SQLITE_OK )
{
sqlite3_bind_text(statement, 1, [mainUrl UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_blob(statement, 2, [imgData bytes], [imgData length], SQLITE_TRANSIENT);
sqlite3_step(statement);
}
else NSLog( @"SaveBody: Failed from sqlite3_prepare_v2. Error is: %s", sqlite3_errmsg(articlesDB) );
// Finalize and close database.
sqlite3_finalize(statement);
}
画像の読み込み
// Load images from data base with given image url
- (NSData*) LoadImagesFromSql: (NSString*) imageLink
{
NSData* data = nil;
NSString* sqliteQuery = [NSString stringWithFormat:@"SELECT IMAGE FROM IMAGES WHERE URL = '%@'", imageLink];
sqlite3_stmt* statement;
if( sqlite3_prepare_v2(articlesDB, [sqliteQuery UTF8String], -1, &statement, NULL) == SQLITE_OK )
{
if( sqlite3_step(statement) == SQLITE_ROW )
{
int length = sqlite3_column_bytes(statement, 0);
data = [NSData dataWithBytes:sqlite3_column_blob(statement, 0) length:length];
}
}
// Finalize and close database.
sqlite3_finalize(statement);
return data;
}