On 07/10/16 18:48, Thomas Kellerer wrote:
Stephen Davies schrieb am 07.10.2016 um 09:12:
I am trying to use the import_bytea function described in various list posts (PG version 9.3.14) in a jsp.
I get an error saying that only the super user can use server-side lo_import().
If I change the Java connection to use user postgres, the function works but I would prefer not to do this.
Is there a better way to update a bytea column from an uploaded file (in this case a small jpeg)?
Since you mention JSP, I assume you are using JDBC.
You can store the contents of a file in a bytea using plain JDBC no lo_import() required
String sql = "insert into images (id, image_data) values (?,?)";
Connection con = ....;
File uploaded = new File("...");
InputStream in = new FileInputStream(uploaded);
PreparedStatement pstmt = con.prepareStatement(sql);
pstmt.setInt(1, 42);
pstmt.setBinaryStream(in, (int)uploaded.length());
pstmt.executeUpdate();
This *only* works with bytea column, not with "large objects".
In production code you obviously need to close all resources and handle errors.
I left that out for simplicity.
Thomas
That looks reasonable but I need to update rather than insert and my similar
code with sql="update part set pic=? where id=3" did not work.
Cheers,
Stephen
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