Java 不知道如何转换为字符串和打印结果集，请选择语句

这是我的一小段代码。基本上，我不知道如何打印结果集或将其转换为字符串

try {
  String url = "jdbc:odbc:" + "userstuff"; 
  Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
  Connection con = DriverManager.getConnection(url,"","");
  // Gets a statement
  Statement state = con.createStatement();
  String query = "SELECT description FROM topics WHERE title = '" + title + "'";
  String query2 = "SELECT * FROM comment WHERE topic = '" + title + "'";
  // selects the description for the selected topic ( title will be referenced to the chosen topic)
  ResultSet results = state.executeQuery(query);
  // selects * of the rows from "comment" table where the topic equals the selected title.
  ResultSet results2 = state.executeQuery(query2);
  desc = results.toString();
}

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您不能将ResultSet转换为字符串，也不能直接从ResultSet打印

下面的代码可能对您有所帮助

try {
    String url = "jdbc:odbc:" + "userstuff"; 

    Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");

    Connection con = DriverManager.getConnection(url,"","");

    // Gets a statement
    Statement state1 = con.createStatement();
    Statement state2 = con.createStatement();

    String query1 = "SELECT description FROM topics WHERE title = '" + title + "'";

    // selects the description for the selected topic ( title will be referenced to the chosen topic)
    ResultSet results1 = state1.executeQuery( query1 );

    while( results.next() ){

        System.out.println( results1.getString( "description" );
    }

    // selects * of the rows from "comment" table where the topic equals the selected title.
    String query2 = "SELECT * FROM comment WHERE topic = '" + title + "'";

    ResultSet results2 = state2.executeQuery( query2 );

    while( results2.next() ){

        System.out.println( results2.getString( 1 ); // here 1 is tables 1st column
        System.out.println( results2.getString( 2 ); // here 2 is tables 2nd column
    }
} Exception( SQL e){

    e.printStackTrace();
}

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这不是好代码。简而言之，您应该将所有结果集映射到一个对象或数据结构中，并在范围内关闭它。学习如何使用PreparedStatement；不要像您这样手动建立查询字符串。谷歌为SQL注入理解为什么。ODBC网桥驱动程序在JDK 8中不再可用。你不应该依赖它。好的，谢谢你的提示和帮助。我会努力改进我的代码，我对这个很陌生。哦，好吧，我明白了！谢谢你的帮助看起来效果好多了。