将数据添加到MySQL数据库

为了进行测试，我创建了一个包含2个jTextField，一个按钮和一个表的表单。我正在尝试将数据添加到数据库。但是我似乎遇到了一个问题。当我按下按钮时，它返回失败消息，因为尚未将数据添加到数据库中。我将不胜感激。所以这就是我在做什么。我创建了ConnectionConfiguration类以简化代码：

public class ConnectionConfiguration {
    public static Connection getConnection() {
    Connection connection = null;
    try {
        Class.forName("com.mysql.jdbc.Driver");
        System.out.println("Connection Success");
    } catch(ClassNotFoundException e) {
        System.out.println("Connection Failed");
    }
    try {
        connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/systemnew?zeroDateTimeBehavior=convertToNull", "root","123456");
        System.out.println("Database Connected");
    } catch (SQLException se){
        System.out.println("No Database" + se);
    }
    return connection;
    }   
}

连接始终是成功的，而数据库始终是连接的。错误消息指出我的错误在这里（在systemnew.UpdateDatabase.add处）。这是UpdateDatabase类的add方法：

public boolean add(String field1, String field2) {
    try {
        Connection conn = ConnectionConfiguration.getConnection();
        PreparedStatement ps = conn.prepareStatement("INSERT INTO newtable(field1,field2) VALUES('"+field1+"','"+field2+"')");
        ps.executeUpdate();
        return true;
    } catch(Exception ex){
        ex.printStackTrace();
    }
    return false;
}

以下是按钮的代码，该按钮应该可能会将数据添加到数据库中：

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    if(new UpdateDatabase().add(jTextField1.getText(),jTextField2.getText())){
        JOptionPane.showMessageDialog(null, "Added successfully!");
    } else {
        JOptionPane.showMessageDialog(null, "Record has not been added!");
    }
}  

错误

Connection Success
Database Connected
java.sql.SQLException: Field 'tblid' doesn't have a default value
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:963)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3966)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3902)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2526)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2673)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2549)
    at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1861)
    at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2073)
    at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2009)
    at com.mysql.jdbc.PreparedStatement.executeLargeUpdate(PreparedStatement.java:5098)
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1994)
    at systemnew.UpdateDatabase.add(UpdateDatabase.java:38)