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在iOS下用sqlite数据库存储图片，先把你的图片转换成 NSData 形式，然后在数据库添加一行 blob 数据

假定数据库中存在表 test_table(name,image), 下面代码将图片文件test.png的二进制数据写到sqlite数据库：

char *name = "test";
NSString * nameString = [NSString stringWithCString:name encoding:NSUTF8StringEncoding];
NSString * filePath = [[NSBundle mainBundle] pathForResource:nameString ofType:@"png"];
if ([[NSFileManager defaultManager] fileExistsAtPath:filePath])
{NSData * imgData = UIImagePNGRepresentation([UIImage imageWithContentsOfFile:filePath]);const  char * sequel = "insert into test_table(name,image) values(?,?)";sqlite3_stmt * update;if (sqlite3_prepare_v2(database, sequel, -1, &update, NULL) == SQLITE_OK){sqlite3_bind_text(update, 1, name, -1, NULL);sqlite3_bind_blob(update, 2, [imgData bytes], [imgData length], NULL);if( sqlite3_step(update) == SQLITE_DONE){NSLog(@"已经写入数据");}sqlite3_finalize(update);}
}
else
{NSLog(@"文件不存在");
}下面代码从数据库中读取图片二进制数据，然后显示图片：
const char * sequel = "select image from test_table where name=?";
sqlite3_stmt * getimg;
if (sqlite3_prepare_v2(database, sequel, -1, &getimg, NULL) == SQLITE_OK)
{char *name = "test";sqlite3_bind_text(update, 1, name, -1, NULL);if(sqlite3_step(getimg)  == SQLITE_ROW){int bytes = sqlite3_column_bytes(getimg, 0);Byte * value = (Byte*)sqlite3_column_blob(getimg, 1);if (bytes !=0 && value != NULL){NSData * data = [NSData dataWithBytes:value length:bytes];UIImage * img = [UIImage imageWithData:data];UIImageView * aview =[[UIImageView alloc] initWithFrame:CGRectMake(0.0, 0.0, IMAGE_WIDTH, IMAGE_HEIGHT)];aview.image = img;[self.view addSubview:aview];[aview release];}}sqlite3_finalize(getimg);
}

例2:

存储图片:

// Save Small Image Data by given main url   - (void) SaveImagesToSql: (NSData*) imgData :(NSString*) mainUrl  {  NSLog( @"\n*****Save image to SQLite*****\n" );  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);  }

读取图片:

// 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;  }