Question

我正在尝试从java程序更新mysql中的表。我已经通过运行SELECT查询成功地尝试了连接。

使用以下代码，我没有得到任何异常，程序也没有崩溃。但是在运行insert-method之后表没有更新。

public void insert() throws SQLException, ParseException {

    PreparedStatement stmt = null;
    Connection con = null;

    in = new Scanner(System.in);

    System.out.println("Write name: ");
    String name = in.nextLine();

    System.out.println("Write date: ");
    String dateString = in.nextLine();

    DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
    Date myDate = formatter.parse(dateString);
    java.sql.Date sqlDate = new java.sql.Date(myDate.getTime());


    // Set the SQL statement into the query variable
    String query = "INSERT INTO Kopers (name, date) VALUES (?, ?)";



    try {
        con = connect();


        stmt = con.prepareStatement(query);

        stmt.setString(1, name);
        stmt.setDate(2, sqlDate);


        // Execute the SQL statement that is prepared in the variable stmt
        stmt.executeUpdate();

        System.out.println("Inserting " + name + " with date: " + sqlDate + " into database.");


    } finally {
        try {
            stmt.close();
            con.close();
            System.out.println("Connection closed.");
        }
        catch (Exception e) {
            System.out.printf("Error message: " + e + "\n");
    }
    }

}

connect（）方法：

 public Connection connect()
{
    try
    {
        // register the driver with DriverManager
        Class.forName(driver);
        //create a connection to the database
        Connection con = DriverManager.getConnection(url, username, password);
        // Set the auto commit of the connection to false.
        // An explicit commit will be required in order to accept
        // any changes done to the DB through this connection.
        con.setAutoCommit(false);
        return con;
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }
    return null;
}

Answer 1

您应该在Connection

上使用commit()方法显式提交连接

即

con.commit()

正如您在autoCommit(false)方法中设置了connect()

无法从java插入SQL表

1 个答案: