在iOS的SQLite中检索和存储图像

Question

How can we create a button to store and retrieve images in sqlite in ios application? Actually I am building a Application in which i can take photo from camera and I have to store it and display as a profile picture

Answer 1

Storing image data in database is not proper way if you want to store large number of images. It will hang the UI.

You can make a folder in Document Directory and put the image there. So, you will get image from there only every time.

In the database, store the file-path and get the image from that file path.

Be sure to remove the images from Document Directory, once it becomes unusable ie user changes the profile picture. Otherwise, it will continuously increase your App's memory.

Answer 2

Better to store the image at file path which is your document directory and store the file path in sqlite for faster access of the image.

Make a file path as below:

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);  
NSString *documentsPath = [paths objectAtIndex:0]; //Get the docs directory 
NSString *filePath = [documentsPath stringByAppendingPathComponent:@"image.png"]; //Add the file name
[pngData writeToFile:filePath atomically:YES]; //Write the file

Now filepath string will insert into your sqlite database.

and now when you access the image you will get file path from the sqlite and get image data from that like below:

NSData *pngData = [NSData dataWithContentsOfFile:filePath];
UIImage *image = [UIImage imageWithData:pngData];