Question

我不知道运行文件何时不起作用。

数据库连接

 public Connection connect() {
    Connection conn = null;
    try {
        // db parameters
        // create a connection to the database
        conn = DriverManager.getConnection("jdbc:sqlite:airport.sqlite");

        System.out.println("Connection to SQLite has been established.");

    } catch (SQLException e) {
        System.out.println(e.getMessage());
    } finally {
        try {
            if (conn != null) {
                conn.close();
            }
        } catch (SQLException ex) {
            System.out.println(ex.getMessage());
        }
    }
    return null;
}

插入表

   @FXML
private void insertIntoAirport(ActionEvent event) throws SQLException {



      Connection conn = this.connect();
   PreparedStatement pstmt=null;

    try{

     String url="INSERT INTO airport VALUES(?)";
    pstmt=conn.prepareStatement(url);
 //  pstmt=conn.prepareStatement("INSERT INTO airport  VALUES()");
   pstmt.setString(1,city.getText() );

  pstmt.execute();



     } catch (SQLException e) {
        System.out.println(e.getMessage());
    }



}}

并在此代码中输出给我错误我不明白为什么它不起作用

pstmt=conn.prepareStatement(url);

Answer 1

可能是您的连接URL“ jdbc：sqlite：airport.sqlite”出了问题。可能是由于该原因，无法建立连接，并且“ conn”变为空。在“ jdbc：sqlite”部分之后，提供您数据库的绝对路径。粘贴您将获得更多想法的例外。

SQLite插入在Java中不起作用

1 个答案: