$ git pull
$ git add labs/{你的学号}/*
$ git commit -m "#2 提交实验代码"
$ git push

<form role="form">
  <div class="form-group">
    <label for="exampleInputEmail1">Email address</label>
    <input type="email" class="form-control" id="exampleInputEmail1" placeholder="Enter email">
  </div>
  <div class="form-group">
    <label for="exampleInputPassword1">Password</label>
    <input type="password" class="form-control" id="exampleInputPassword1" placeholder="Password">
  </div>
  <div class="form-group">
    <label for="exampleInputFile">File input</label>
    <input type="file" id="exampleInputFile">
    <p class="help-block">Example block-level help text here.</p>
  </div>
  <div class="checkbox">
    <label>
      <input type="checkbox"> Check me out
    </label>
  </div>
  <button type="submit" class="btn btn-default">Submit</button>
</form>

$( "#target" ).submit(function( event ) {
  alert( "Handler for .submit() called." );
  event.preventDefault();
});

$.ajax({
  url: "success.json
}).done(function(data) {
  if ( console && console.log ) {
      console.dir(data);
      alert(data.msg);
    }
});

{
  "msg": "保存成功！"
}

Class.forName("");

String url = "jdbc:postgresql://<database_host>:<port>/<database_name>";
Connection con = DriverManager.getConnection(url, "userID", "password"); 

private final String url = "jdbc:postgresql://localhost/dvdrental";
private final String user = "postgres";
private final String password = "<add your password>";

public Connection connect() {
        Connection conn = null;
        try {
            conn = DriverManager.getConnection(url, user, password);
            System.out.println("Connected to the PostgreSQL server successfully.");
        } catch (SQLException e) {
            System.out.println(e.getMessage());
        }
 
        return conn;
    }

select * from TABLE_NAME;
insert into ... ;
update ...;
delete ...;

public int getActorCount() {
        String SQL = "SELECT count(*) FROM actor";
        int count = 0;
 
        try (Connection conn = connect();
                Statement stmt = conn.createStatement();
                ResultSet rs = stmt.executeQuery(SQL)) {
            rs.next();
            count = rs.getInt(1);
        } catch (SQLException ex) {
            System.out.println(ex.getMessage());
        }
 
        return count;
    }

public long insertActor(Actor actor) {
        String SQL = "INSERT INTO actor(first_name,last_name) "
                + "VALUES(?,?)";
 
        long id = 0;
 
        try (Connection conn = connect();
                PreparedStatement pstmt = conn.prepareStatement(SQL,
                Statement.RETURN_GENERATED_KEYS)) {
 
            pstmt.setString(1, actor.getFirstName());
            pstmt.setString(2, actor.getLastName());
 
            int affectedRows = pstmt.executeUpdate();
            // check the affected rows 
            if (affectedRows > 0) {
                // get the ID back
                try (ResultSet rs = pstmt.getGeneratedKeys()) {
                    if (rs.next()) {
                        id = rs.getLong(1);
                    }
                } catch (SQLException ex) {
                    System.out.println(ex.getMessage());
                }
            }
        } catch (SQLException ex) {
            System.out.println(ex.getMessage());
        }
        return id;
    } 

TODO

TODO