Question

I’m using Flex 4 Air (sdk 4.5) and SQLite to store blobs (png files) using this code:

sql = "INSERT INTO pages (id, data) VALUES (:id, :data)";           
sqlStatement.text = sql;        
sqlStatement.parameters[":id"] = file.name;         
sqlStatement.parameters[":data"] = file.data;
sqlStatement.execute(); 

The table is defined like this:

CREATE TABLE "pages" ("id" varchar, "data" blob)

The problem is that the data stored has 3-5 extra bytes added to it, in the beginning of the data chunk. (If I store a 1000 bytes png, the data stored in the blob typically become 1004 bytes – confirmed by examining the SQLite file outside the Flex environment).

When reading the data back, using…

sql = "SELECT id, CAST(data AS ByteArray) AS data FROM pages"

…I have to trim the data ByteArray 3-5 bytes to get a valid image.

Clue?

Answer 1

Check this out:

What is the first bytes in a Blob column SQlite Adobe AIR? Blob Sizeinfo?

And if you’re having trouble displaying them:

Flex local SQLite BLOB display