Question

我需要为经理创建一个Java JDBC GUI应用程序，以便能够为员工输入有关其家属的数据。我的代码在下面，一切正常。我无法弄清楚如何让用户能够为多个依赖者输入数据。我想我需要某种循环，但无法弄清楚如何将其添加到此代码中。到目前为止，我尝试过的所有内容都没有工作，只有最新输入的值才会插入到数据库中。

  package database;

  import java.sql.Connection;
  import java.sql.DriverManager;
  import java.sql.PreparedStatement;
  import java.util.Scanner;

  public class addDependent {

    public static void main(String[] args) throws Exception {
    getConnection();
    addEmplDependent();

     }

    public static void addEmplDependent() throws Exception{

    Connection dbConnection = null;
    PreparedStatement preparedStatement = null;

    Scanner scanner = new Scanner(System.in);

    System.out.print("Enter Employee SSN: ");
    String ESSN = scanner.nextLine();

    System.out.print("Enter Dependent Name: ");
    String DNAME = scanner.nextLine();

    System.out.print("Enter Sex: ");
    String SEX = scanner.nextLine();

    System.out.print("Enter Relationship: ");
    String RELATIONSHIP  = scanner.nextLine();



    String insertSQL3 = "INSERT INTO DEPENDENT"
            + "(ESSN,DEPENDENT_NAME,SEX,RELATIONSHIP) VALUES"
            + "(?,?,?,?)";


    scanner.close();

    try {
        dbConnection = getConnection();
        preparedStatement = dbConnection.prepareStatement(insertSQL3);
        preparedStatement.setString(1, ESSN);
        preparedStatement.setString(2, DNAME);
        preparedStatement.setString(3, SEX);
        preparedStatement.setString(4, RELATIONSHIP);

        preparedStatement.executeUpdate();

        }
    catch (Exception e){System.out.println(e);}
    finally {
        System.out.println("Insert Completed!");
        }

    }



    public static Connection getConnection() throws Exception{
    try {
        String driver = "oracle.jdbc.driver.OracleDriver";
        String url = "jdbc:oracle:thin:@apollo.vse.gmu.edu:1521:ite10g";
        String username = "*******";
        String password = "******";
        Class.forName(driver);

        Connection conn = DriverManager.getConnection(url, username, 
    password);
        System.out.println("Connected");
        return conn;
    } catch(Exception e) {System.out.println(e);}
    return null; 
      }

     }

Answer 1

您可以执行swing-GUI并在单击按钮时插入数据。如果要在命令行上运行它，只需在每行上循环插入，直到用户决定退出为止。尽可能少地更改代码，它看起来可能是这样的：

public class addDependent {

public static void main(String[] args) throws Exception {    
  addEmplDependent();
}

public static void addEmplDependent() throws Exception{

  Connection dbConnection = null;
  PreparedStatement preparedStatement = null;
  String insertSQL3 = "INSERT INTO DEPENDENT "
        + "(ESSN,DEPENDENT_NAME,SEX,RELATIONSHIP) VALUES "
        + "(?,?,?,?)";

  try {
    dbConnection = getConnection();
    preparedStatement = dbConnection.prepareStatement(insertSQL3);

    Scanner scanner = new Scanner(System.in);

    boolean continue = true;
    while ( continue ) {
        System.out.print("Enter Employee SSN: ");
        String ESSN = scanner.nextLine();

        System.out.print("Enter Dependent Name: ");
        String DNAME = scanner.nextLine();

        System.out.print("Enter Sex: ");
        String SEX = scanner.nextLine();

        System.out.print("Enter Relationship: ");
        String RELATIONSHIP  = scanner.nextLine();

            preparedStatement.setString(1, ESSN);
            preparedStatement.setString(2, DNAME);
            preparedStatement.setString(3, SEX);
            preparedStatement.setString(4, RELATIONSHIP

        preparedStatement.executeUpdate();

        System.out.print("Continue ? (y/n) : ");
        String goaHead  = scanner.nextLine();
        if ( goaHead.equalsIgnoreCase("n") {
          continue = false;
        }

    }
    scanner.close();
    dbConnection.close();
    preparedStatement.close();

}
catch (Exception e){System.out.println(e);}
finally {
    System.out.println("Insert Completed!");        

    }

}

java jdbc gui应用程序 - 需要允许用户输入

1 个答案: