Anda terlebih dahulu menambahkan for update ke pilihan Anda (dan kolom lain yang ingin Anda perbarui), lalu Anda memperbaruinya. Juga, seperti yang dicatat dalam komentar, pastikan getConnection Anda mengembalikan Connection tanpa autocommit. Dan Anda perlu mengatur Statement ketik untuk menggulir dan CONCUR_UPDATABLE . Sesuatu seperti,
String[] colNames = { "email", "already_linked", "account_link_timestamp" };
String query = "select " + Stream.of(colNames).collect(Collectors.joining(", "))
+ "from email_accounts where already_linked = false for update";
try (Connection conn = getConnection(); // Make sure conn.setAutoCommit(false);
Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,
ResultSet.CONCUR_UPDATABLE);
ResultSet rs = stmt.executeQuery(query)) {
while (rs.next()) {
// Get the current values, if you need them.
String email = rs.getString(colNames[0]);
boolean linked = rs.getBoolean(colNames[1]);
Timestamp time = rs.getTimestamp(colNames[2]);
// ...
rs.updateBoolean(colNames[1], true);
rs.updateTimestamp(colNames[2], //
new Timestamp(System.currentTimeMillis()));
rs.updateRow();
}
} catch (SQLException e) {
e.printStackTrace();
}