Question

我想将结果查询转换为String以在我的java代码中使用.. 有人可以帮忙吗？ TQ

代码::

    rs = st.executeQuery("SELECT password FROM USER WHERE UserID='"+txtUserId.getText()+"';"); 
    pass.add(rs.getString("password"));


    st.close();
    //rs.close();
    con.close();

    }catch(Exception e) {
        e.printStackTrace();
        System.out.println("Could Not Connect to Database");
    }

Answer 1

您需要rs.next()光标向前移动ResultSet数据。

 while(rs.next()){
   pass.add(rs.getString("password"));
 }

Answer 2

executeQuery返回ResultSet - 然后您可以在ResultSet中导航以获取语句/查询返回的值

此处示例

public static void viewTable(Connection con, String dbName)
    throws SQLException {

    Statement stmt = null;
    String query = "select COF_NAME, SUP_ID, PRICE, " +
                   "SALES, TOTAL " +
                   "from " + dbName + ".COFFEES";
    try {
        stmt = con.createStatement();
        ResultSet rs = stmt.executeQuery(query);
        while (rs.next()) {
            String coffeeName = rs.getString("COF_NAME");
            int supplierID = rs.getInt("SUP_ID");
            float price = rs.getFloat("PRICE");
            int sales = rs.getInt("SALES");
            int total = rs.getInt("TOTAL");
            System.out.println(coffeeName + "\t" + supplierID +
                               "\t" + price + "\t" + sales +
                               "\t" + total);
        }
    } catch (SQLException e ) {
        JDBCTutorialUtilities.printSQLException(e);
    } finally {
        if (stmt != null) { stmt.close(); }
    }
}

Answer 3

试试这个： 您希望获得多个值均值使用

while(rs.next()){
   pass.add(rs.getString("password"));
 }

您想获得单一价值

if(rs.next()){
   pass.add(rs.getString("password"));
 }

将结果查询转换为字符串

3 个答案: