Retrieving file from bytea in PostgreSQL using java

限于喜欢 提交于 2019-12-04 14:14:48

The data is escaped ( starts with \x and then is hexadecimal two chars for each byte) this is what comes out of a bytea field. you need to unescape it before storing it in the file.

Instead of doing it manually, you can use Spring:

ResultSet rs = st.executeQuery("SELECT * FROM test_bytea where id=" + 1);
if (rs != null) {
    LobHandler lobHandler = new DefaultLobHandler();
    byte[] myFile = lobHandler.getBlobAsBytes(rs, "type_file"));
    //....
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