无法返回值

时间:2019-09-10 13:04:02

标签: java spring

我是春天的新手。这是我的代码,用于从Access DB文件返回值,我需要在返回时捕获响应。

我以不同的方式尝试了它,没有什么好喜欢的。

无法捕获以下代码输出的返回结果。

我正在Jdeveloper中运行它。

任何想法都会受到赞赏。

    package accessdatatoebs;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;


public class AccessClass {
        public AccessClass() {
          super();
        }

        public static void main(String[] args) {

            // variables
            Connection connection = null;
            Statement statement = null;
            ResultSet resultSet = null;

            // Step 1: Loading or 
            // registering Oracle JDBC driver class
            try {
                Class.forName("net.ucanaccess.jdbc.UcanaccessDriver");
            }
            catch(ClassNotFoundException cnfex) {
                System.out.println("Problem in loading"
                        + " MS Access JDBC driver");
                cnfex.printStackTrace();
            }

            // Step 2: Opening database connection

                try {

                           String msAccDB = "G:\\RMMDB\\RM.mdb";
                            String dbURL = "jdbc:ucanaccess://" +msAccDB; 

                // Step 2.A: Create and 
                // get connection using DriverManager class
                connection = DriverManager.getConnection(dbURL); 

                // Step 2.B: Creating JDBC Statement 
                statement = connection.createStatement();

                // Step 2.C: Executing SQL and
                // retrieve data into ResultSet
                resultSet = statement
                        .executeQuery("SELECT * FROM tbl_Materials");

               // System.out.println("ID\tName\t\t\tAge\tMatches");
               System.out.println("Material\tAccount");
                System.out.println("====\t========");

                // processing returned data and printing into console
                while(resultSet.next()) {
                    System.out.println(resultSet.getInt(1) + "\t" + 
                            resultSet.getString(2) + "\t" + 
                            resultSet.getString(3) + "\t" +
                            resultSet.getString(4));
                }
            }

            catch(SQLException sqlex){
                sqlex.printStackTrace();
            }
            finally {
                // Step 3: Closing database connection
                try {
                    if(null != connection) {

                        // cleanup resources, once after processing
                        resultSet.close();
                        statement.close();

                        // and then finally close connection
                        connection.close();
                    }
                }
                catch (SQLException sqlex) {
                    sqlex.printStackTrace();
                }
            }
        return resultSet; 
        }
    }

1 个答案:

答案 0 :(得分:-1)

从这里您可以捕获结果并以list的形式返回

我解释为注释的每个新添加的代码

["19", "59", "16" "547"]