How to Retrieve Images Stored as BLOBs from MySQL in Java?

Retrieving BLOB-Stored Images from MySQL in Java

Retrieving images stored as BLOBs (Binary Large Objects) in MySQL using Java involves accessing the database and extracting the binary data representing the image. Here's how to do it:

Solution:

To retrieve an image stored as a BLOB in MySQL, you can use the following steps:

1. Connect to the MySQL database using Java.
2. Create a JDBC ResultSet object by executing an SQL query that retrieves the BLOB field (IMAGEN in your case) from the IMAGENES_REGISTROS table.
3. Retrieve the Blob object from the ResultSet using getBlob(yourBlobColumnIndex).

4. Obtain the image data as a binary stream or byte array:

   • For a binary stream, use imageBlob.getBinaryStream(0, imageBlob.length()).
   • For a byte array, use imageBlob.getBytes(1, (int) imageBlob.length()).
5. Store the binary data in memory or pass it directly to the PDF creation process.

Note: It's recommended to use resultSet.getBinaryStream(yourBlobColumnIndex) to retrieve the binary data as a stream for better performance and memory management.

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