小编Ric*_*ker的帖子

例如，如果我添加new Department(new BigInteger("50"), "ODD", "SPB")，所有工作都会将其值插入到数据库中。但如果我想再次插入例如new Department(new BigInteger("50"), "ODDMOD", "SPBMOD")，出现java.sql.SQLIntegrityConstraintViolationException: integrity constraint violation: unique constraint or index violation; SYS_PK_10092 table: DEPARTMENT。我知道不能插入具有相同主键的值，但是如果主键存在或其他解决方案如何更新值？

 public Department save(Department department) throws SQLException {
    
            Connection connection = ConnectionSource.instance().createConnection();
            String sql = "insert into department values (?, ?, ?)";
            PreparedStatement statement = connection.prepareStatement(sql);
    
            statement.setLong(1, Long.parseLong(String.valueOf(department.getId())));
            statement.setString(2, department.getName());
            statement.setString(3, department.getLocation());
                    statement.executeUpdate();
            PreparedStatement st = connection.prepareStatement("select * from department where id = ? ");
            st.setLong(1, Long.parseLong(String.valueOf(department.getId())));
            ResultSet resultSet = st.executeQuery();
            resultSet.next();
            Department demper = …