JDBCエラーです。助けてください

Question

私は予約プログラムを作っています。

私はMySQL JDBCエラーに直面しています。

以下のコードを実行しました。

public void ReservationModifyQuery(String room, String name, String phone, String nop, String revdate, String revtime, String usetime, String isgroup, String id, String PrefRoom, String PrefReservationTime, String PrefDateString, Connection conn) throws Exception{ 

    String updateDB = "UPDATE reservation SET "; 
    String sql = "roomNum = ?,"+ 
        "Name = ? ,"+ 
        "Phone = ? ,"+ 
        "NumOfPeople = ? ,"+ 
        "ReservationDate = ? ,"+ 
        "ReservationTime = ? ,"+ 
        "UseTime = ? ,"+ 
        "Group = ? ,"+ 
        "ID = ? "; 

    sql = "roomNum = ?"; 
    String where = "where roomNum = ? and ReservationDate = ? and ReservationTime = ? ;"; 
    pstmt = conn.prepareStatement(updateDB+sql+where); 
    pstmt.setInt(1, Integer.parseInt(room)); 
    pstmt.setInt(2, Integer.parseInt(PrefRoom)); 
    pstmt.setDate(3, Date.valueOf(PrefDateString)); 
    pstmt.setTime(4, Time.valueOf(PrefReservationTime)); 
    pstmt.executeUpdate(); 

    sql = "Name = ?"; 
    pstmt = conn.prepareStatement(updateDB+sql+where); 
    pstmt.setString(1, name); 
    pstmt.setInt(2, Integer.parseInt(PrefRoom)); 
    pstmt.setDate(3, Date.valueOf(PrefDateString)); 
    pstmt.setTime(4, Time.valueOf(PrefReservationTime)); 
    pstmt.executeUpdate(); 

    sql = "Phone = ?"; 
    pstmt = conn.prepareStatement(updateDB+sql+where); 
    pstmt.setString(1, phone); 
    pstmt.setInt(2, Integer.parseInt(PrefRoom)); 
    pstmt.setDate(3, Date.valueOf(PrefDateString)); 
    pstmt.setTime(4, Time.valueOf(PrefReservationTime)); 
    pstmt.executeUpdate(); 

    sql = "NumOfPeople = ?"; 
    pstmt = conn.prepareStatement(updateDB+sql+where); 
    pstmt.setInt(1, Integer.parseInt(nop)); 
    pstmt.setInt(2, Integer.parseInt(PrefRoom)); 
    pstmt.setDate(3, Date.valueOf(PrefDateString)); 
    pstmt.setTime(4, Time.valueOf(PrefReservationTime)); 
    pstmt.executeUpdate(); 

    sql = "ReservationDate = ?"; 
    pstmt = conn.prepareStatement(updateDB+sql+where); 
    pstmt.setDate(1, Date.valueOf(revdate)); 
    pstmt.setInt(2, Integer.parseInt(PrefRoom)); 
    pstmt.setDate(3, Date.valueOf(PrefDateString)); 
    pstmt.setTime(4, Time.valueOf(PrefReservationTime)); 
    pstmt.executeUpdate(); 

    sql = "ReservationTime = ?"; 
    pstmt = conn.prepareStatement(updateDB+sql+where); 
    pstmt.setTime(1, Time.valueOf(revtime)); 
    pstmt.setInt(2, Integer.parseInt(PrefRoom)); 
    pstmt.setDate(3, Date.valueOf(PrefDateString)); 
    pstmt.setTime(4, Time.valueOf(PrefReservationTime)); 
    pstmt.executeUpdate(); 

    sql = "UseTime = ?"; 
    pstmt = conn.prepareStatement(updateDB+sql+where); 
    pstmt.setDouble(1, Double.parseDouble(usetime)); 
    pstmt.setInt(2, Integer.parseInt(PrefRoom)); 
    pstmt.setDate(3, Date.valueOf(PrefDateString)); 
    pstmt.setTime(4, Time.valueOf(PrefReservationTime)); 
    pstmt.executeUpdate(); 

    sql = "Group = ?"; 
    pstmt = conn.prepareStatement(updateDB+sql+where); 
    pstmt.setString(1, isgroup); 
    pstmt.setInt(2, Integer.parseInt(PrefRoom)); 
    pstmt.setDate(3, Date.valueOf(PrefDateString)); 
    pstmt.setTime(4, Time.valueOf(PrefReservationTime)); 
    pstmt.executeUpdate(); 

    sql = "ID = ?"; 
    pstmt = conn.prepareStatement(updateDB+sql+where); 
    pstmt.setString(1, id); 
    pstmt.setInt(2, Integer.parseInt(PrefRoom)); 
    pstmt.setDate(3, Date.valueOf(PrefDateString)); 
    pstmt.setTime(4, Time.valueOf(PrefReservationTime)); 
    pstmt.executeUpdate(); 


    pstmt.close(); 
    conn.close(); 
} 

このコードは以下の構文例外が発生します。 しかし、私は、エラー部分を知らない...

どのように私はこの問題を解決することができますか？

Answer 1

文の間にスペースはありません。あなたのコードでは、preparedStatementのSQLは

UPDATE reservation SET roomNum=?,Name = ?,Phone = ? ,NumOfPeople = ? ,ReservationDate = ? ,ReservationTime = ? ,UseTime = ? ,Group = ? ,ID = ?where roomNum = ? and ReservationDate = ? and ReservationTime = ? ; 

です。間にスペースがないので正しくありません。そして、どこ。

whereステートメントからセミコロンも削除しました。あなたは初めに `sql`変数への2つの割り当てを行う代わりに、

String where = "where roomNum = ? and ReservationDate = ? and ReservationTime = ? ;";