第一步：建立一張銀行賬戶表 叫 BankAccount 並建立一個序列

id         number    pk         //使用者id
ano        varchar2(30)  uk     //使用者卡號
apassword  varchar2(30)         //使用者密碼
aname      varchar2(30)         //使用者名稱
amoney     number               //餘額

//建立銀行使用者表
drop table bank_account;
create table    bank_account(
     id    number  constraint   bank_account_id_pk   primary key,
     ano  varchar(30) constraint bank_account_ano_uk  unique,
     apassword  varchar(30), 
     aname   varchar(30),
     amoney  number
);
drop sequence bank_account_id_seq;
create sequence    bank_account_id_seq;
6.2 寫一個java程式  用來開戶   只要輸入 賬號                  密碼     開戶人的姓名   餘額 
開戶資訊如下                           6225880111887788     123456   zhangsan       99999999  
                                      6225880111887799     123456   lisi    9  
 

第二步：建立Bean包，編寫實體類

public class BankAccount {
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getAno() {
        return ano;
    }
    public void setAno(String ano) {
        this.ano = ano;
    }
    public String getAname() {
        return aname;
    }
    public void setAname(String aname) {
        this.aname = aname;
    }
    public String getApassword() {
        return apassword;
    }
    public void setApassword(String apassword) {
        this.apassword = apassword;
    }
    public String getAmoney() {
        return amoney;
    }
    public void setAmoney(String amoney) {
        this.amoney = amoney;
    }
    @Override
    public String toString() {
        return "BankAccount [id=" + id + ", ano=" + ano + ", aname=" + aname + ", apassword=" + apassword + ", amoney="
                + amoney + "]";
    }
    public BankAccount(String ano, String aname, String apassword, String amoney) {
        super();
        this.ano = ano;
        this.aname = aname;
        this.apassword = apassword;
        this.amoney = amoney;
    }
    public BankAccount(int id, String ano, String aname, String apassword, String amoney) {
        super();
        this.id = id;
        this.ano = ano;
        this.aname = aname;
        this.apassword = apassword;
        this.amoney = amoney;
    }
    public BankAccount() {
        super();
        // TODO Auto-generated constructor stub
    }
    private int id;
    private String ano;
    private String aname;
    private String apassword;
    private String amoney;
}
 

第三步：建立賬號，編寫開戶程式

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.Scanner;
import com.xdl.util.JdbcUtil2;

public class CreateBankAccount {
    public static void main(String[] args) {
         Scanner  sc = new Scanner(System.in);
         System.out.println("請輸入開戶的卡號:");
         String  ano = sc.nextLine();
         System.out.println("請輸入開戶的名字:");
         String  aname = sc.nextLine();
         System.out.println("請輸入開戶的密碼:");
         String  apassword = sc.nextLine();
         System.out.println("請輸入開戶的錢數:");
         String  smoney = sc.nextLine();
         //double  amoney = Double.parseDouble(smoney);
         // 把輸入的資料 包裝成物件  
         BankAccount  ba = new BankAccount(ano, aname, apassword, smoney);
         Connection  conn = null;
         PreparedStatement  ps = null;
         conn = JdbcUtil2.getConnection();
         String  sql="insert into bank_account values(bank_account_id_seq.nextval,?,?,?,?)";
         try {
            ps = conn.prepareStatement(sql);
            ps.setString(1, ba.getAno());
            ps.setString(2, ba.getApassword());
            ps.setString(3, ba.getAname());
            ps.setDouble(4, Double.parseDouble(ba.getAmoney()));
            int rows = ps.executeUpdate();
            if(rows == 1) {
                System.out.println("開戶成功");
            }else{
                System.out.println("開戶失敗");
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }finally{
            JdbcUtil2.releaseResource(conn, ps, null);
        }
    }
}
 

第四步：編寫轉賬程式

1、先登入，登入成功才可以執行轉賬程式

2、轉賬邏輯時，連結會自動進行資料的提交，這樣萬一轉入的賬戶不成功，則無法回退之前的操作，為了解決 操作語句 需要同時成功或同事失敗 則需要關閉連線的自動提交

禁止自動提交 conn.setAutoCommit(false);
語句都成功 就提交 conn.commit() ；否則進行回滾 conn.rollback();

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Scanner;
import com.xdl.util.JdbcUtil2;

public class BankAccountTransfer {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("請輸入登入的卡號:");
        String  ano  = sc.nextLine();
        System.out.println("請輸入登入的密碼:");
        String  apassword = sc.nextLine();
        Connection  conn = null;
        PreparedStatement ps = null;
        /* 定義兩個轉賬的  PreparedStatement */
        PreparedStatement from = null;
        PreparedStatement to = null;
        ResultSet  rs = null;
        BankAccount  ba = null;
        conn = JdbcUtil2.getConnection();
        String  sql="select * from bank_account where ano=? and apassword=?";
        try {
            ps=conn.prepareStatement(sql);
            ps.setString(1, ano);
            ps.setString(2, apassword);
            rs = ps.executeQuery();
            if(rs.next()){
                ba = new BankAccount(rs.getInt("id"),
                   rs.getString("ano"), rs.getString("aname"), rs.getString("apassword"),
                   rs.getString("amoney"));
            }
            if(ba!=null){
                System.out.println("登入成功");
                // 從當前賬戶中扣除輸入的金額
                System.out.println("請輸入轉賬的金額:");
                String  smoney=sc.nextLine();
                double  money = Double.parseDouble(smoney);
                sql="update  bank_account set amoney=amoney-? where ano=?";
                // 禁止自動提交  
                conn.setAutoCommit(false);
                from = conn.prepareStatement(sql);
                from.setDouble(1, money);
                from.setString(2, ba.getAno());
                int  fromf=from.executeUpdate();
                // 提示使用者輸入轉入的賬號  和  賬戶名
                System.out.println("請輸入收款的賬號:");
                String  toano = sc.nextLine();
                System.out.println("請輸入收款人姓名:");
                String  toaname= sc.nextLine();
                sql="update  bank_account set amoney=amoney+? where ano=? and aname=?";
                to=conn.prepareStatement(sql);
                to.setDouble(1, money);
                to.setString(2, toano);
                to.setString(3, toaname);
                int tof = to.executeUpdate();
                if(fromf==1 && tof==1){
                    System.out.println("轉賬成功");
                    conn.commit(); //提交
                }else{
                    System.out.println("轉賬失敗");
                    conn.rollback(); //回滾
                }
            }else{
                System.out.println("登入失敗");
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            try {
                conn.rollback();
            } catch (SQLException e1) {
                e1.printStackTrace();
            }
            e.printStackTrace();
        }finally{
            JdbcUtil2.releaseResource(conn, ps, rs);
            JdbcUtil2.releaseResource(conn, from, null);
            JdbcUtil2.releaseResource(conn, to, null);
        }
    }
}