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프로그래밍 삽질 중
Java로 계좌 관련 문제(입금, 출금, 송금 내용 포함) 본문
[문제] java로 계좌 생성 및 입금, 출금, 송금, 잔액조회, 모든 계좌 조회 만들기
1) sql문을 작성한다
2) db와 java를 연동한다
3) Account.java를 만든다
4) ① 계좌 생성 ② 입금 ③ 출금 ④ 송금 ⑤ 잔액 조회 ⑥ 모든 계좌 조회 관련 java문 만들기(Main.java)
5) 4)에서 구현한 정보들이 나오는 나머지 구현
※ 마지막에 3)의 완성본 올림
1) SQL문(테이블 이름은 account)
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create table account (
accountId varchar2(40),
pwd varchar2(40),
name varchar2(30),
balance number);
//내용 입력하기 insert into account values('law001', 111, '강솔A', 30000);
insert into account values('law002', 222, '한준휘', 25000);
insert into account values('law003', 333, '강솔B', 50000);
commit; //commit해야 입력한 내용이 java문에서 보임
select * from account;
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2) DB와 java문 연동(java문 이름은 Main.java)
Main.java에 들어갈 내용
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String url = "jdbc:oracle:thin:@localhost:1521:xe";
String dbId= "scott";
String dbPwd = "tiger";
public static Connection getConnectivity
(String url, String dbId, String dbPwd) {
Connection conn = null;
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
conn = DriverManager.getConnection(url, dbId, dbPwd);
} catch (Exception e) {
e.printStackTrace();
}
return conn;
}
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3) Account.java
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package May_0521;
public class Account {
private String accountId;
private int pwd;
private String name;
private int balance=0;
public Account(String accountId, int pwd, String name, int balance) {
/* super(); */
this.accountId = accountId;
this.pwd = pwd;
this.name = name;
this.balance = balance;
}
public String getAccountId() {
return accountId;
}
public void setAccountId(String accountId) {
this.accountId = accountId;
}
public int getPwd() {
return pwd;
}
public void setPwd(int pwd) {
this.pwd = pwd;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getBalance() {
return balance;
}
public void setBalance(int balance) {
this.balance = balance;
}
public String toString() {
return "Account [acoountid=" + accountId + ", pwd=" + pwd
+ ", name=" + name + ", balance=" + balance + "]";
}
}
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4) ① 계좌 생성 ② 입금 ③ 출금 ④ 송금 ⑤ 잔액 조회 ⑥ 모든 계좌 조회 관련
①계좌 생성(addAccount)
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public static void addAccount(Connection conn, PreparedStatement pstmt, Account acc) {
/*private String accountId; private int pwd;
private String name; private int balance=0;*/
String sql = "insert into account values(?,?,?,?)";
int result = 0;
try {
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, acc.getAccountId());
pstmt.setInt(2, acc.getPwd());
pstmt.setString(3, acc.getName());
pstmt.setInt(4, acc.getBalance());
result = pstmt.executeUpdate();
} catch(Exception e) {
e.printStackTrace();
}
System.out.print("계좌 정보 저장 완료");
}
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② 입금(deposit, isCorrect)
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public static void deposit(Connection conn,PreparedStatement pstmt, ResultSet rs ,String accountId, int money) {
String sql = null;
int balance = 0;
try {
//조회하기
sql = "select balance from account where accountId=?";
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, accountId);
rs = pstmt.executeQuery();
rs.next();
balance = rs.getInt(1);
//수정하기
sql = "update account set balance=? where accountId=?";
pstmt = conn.prepareStatement(sql);
pstmt.setInt(1, balance+money);
pstmt.setString(2, accountId);
pstmt.execute();
}catch(Exception e) {
e.printStackTrace();
}System.out.println("입금이 완료되었습니다.");
}
//비밀번호 오류 시 조회 불가 ㅓ
public static boolean isCorrect(Connection conn, PreparedStatement pstmt, ResultSet rs,
String accountId, int pwd) {
String sql = "select * from account ";
boolean result = true;
try {
pstmt = conn.prepareStatement(sql);
rs = pstmt.executeQuery();
while(rs.next()) {
if(accountId.equals(rs.getString(1))&&pwd!=rs.getInt(2)) {
System.out.println("비밀번호가 일치하지 않습니다.");
result = false;
}else if(accountId.equals(rs.getString(1))&&pwd==rs.getInt(2)) {
result = true;
}
}
}catch(Exception e) {
e.printStackTrace();
}
return result;
}
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③ 출금(withdraw)
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public static void withdraw(Connection conn,PreparedStatement pstmt,ResultSet rs , String accountId, int money) {
String sql = null;
int balance = 0;
try {
//조회하기
sql = "select balance from account where accountId=?";
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, accountId);
rs = pstmt.executeQuery();
rs.next();
balance = rs.getInt(1);
if(balance >= money) {
sql = "update account set balance=? where accountId=?";
pstmt = conn.prepareStatement(sql);
pstmt.setInt(1, balance-money);
pstmt.setString(2, accountId);
pstmt.execute();
System.out.println("출금이 완료되었습니다.");
}else {
//balance < money일
System.out.println("잔액이 충분하지 않습니다.");
}
}catch (Exception e) {
e.printStackTrace();
}
}
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④ 송금(transfer)
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public static void tranfer(Connection conn,PreparedStatement pstmt, ResultSet rs,
String accountId, String target ,int money) {
String sql = null;
int balance = 0;
int targetBalance;
try {
sql = "select balance from account where accountId=?";
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, accountId);
rs = pstmt.executeQuery();
rs.next();
balance = rs.getInt(1);
if(balance >= money) {
sql = "select balance from account where accountId=?";
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, target);
rs = pstmt.executeQuery();
rs.next();
targetBalance = rs.getInt(1);
//잔액 추가
sql = "update account set balance=? where accountId=?";
pstmt = conn.prepareStatement(sql);
pstmt.setInt(1, targetBalance+money);
pstmt.setString(2, target);
pstmt.execute();
//잔액 빠짐
sql = "update account set balance=? where accountId=?";
pstmt = conn.prepareStatement(sql);
pstmt.setInt(1, balance-money);
pstmt.setString(2, accountId);
pstmt.execute();
}else {
System.out.println("잔액이 부족합니다.");
}
}catch (Exception e) {
e.printStackTrace();
}
}
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⑤ 잔액 조회(checkBalance)
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public static int checkBalance(Connection conn, PreparedStatement pstmt, ResultSet rs, String accountId) {
String sql = null;
int balance = 0;
try {
sql = "select balance from account where accountId=?";
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, accountId);
rs = pstmt.executeQuery();
rs.next();
balance = rs.getInt(1);
}catch (Exception e) {
e.printStackTrace();
}
return balance;
}
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⑥ 전체 계좌 조회(getAllAccount)
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public static List<Account> getAllAccount(Connection conn, PreparedStatement pstmt, ResultSet rs){
List<Account> aList = new ArrayList<Account>();
String sql = "select * from account";
try {
pstmt = conn.prepareStatement(sql);
rs = pstmt.executeQuery();
while(rs.next()) {
aList.add(new Account(rs.getString("accountId"), rs.getInt("pwd"),
rs.getString("name"), rs.getInt("balance")));
}
}catch(Exception e) {
e.printStackTrace();
}
return aList;
}
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5) 4)에서 구현한 정보들이 나오는 나머지 구현
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public static void main(String[] args) {
String url = "jdbc:oracle:thin:@localhost:1521:xe";
String dbId = "scott";
String dbPwd = "tiger";
Scanner scan = new Scanner(System.in); //값을 콘솔ㅔ 입력하기 위함
int select;
String accountId = null;
ResultSet rs = null;
PreparedStatement pstmt = null;
Connection conn = getConnectivity(url, dbId, dbPwd);
List<Account> aList = null;
//무한루프로 1~7번이 나오게 함 Loop:
while(true) {
System.out.println("---------------------------------------------------------------------");
System.out.println("1.계좌개설 | 2.입금 | 3.출금 | 4.송금 | 5.잔액조회 | 6.전체계좌조회 | 7.프로그램 종료|");
System.out.println("---------------------------------------------------------------------");
System.out.print("메뉴를 선택하세요 >>");
select = scan.nextInt();
switch(select) {
case 1://계좌 추가
System.out.print("계좌번호, 비밀번호, 이름, 최초 입금액을 입력하세요 >> ");
Account acc = new Account(scan.next(), scan.nextInt(), scan.next(), scan.nextInt());
addAccount(conn, pstmt, acc);
break;
case 2://입금
System.out.print("계좌번호와 입금액을 입력하세요 >> ");
deposit(conn, pstmt, rs, scan.next(), scan.nextInt());
break;
case 3://출금
System.out.print("계좌번호와, 비밀번호, 출금액을 입력하세요 >> ");
accountId = scan.next();
if(isCorrect(conn, pstmt, rs, accountId, scan.nextInt())) {
withdraw(conn, pstmt, rs, accountId, scan.nextInt());
}
break;
case 4://송금
System.out.print("계좌번호, 비밀번호, 송금받을 계좌번호, 송금액을 입력하세요 >> ");
accountId = scan.next();
if(isCorrect(conn, pstmt, rs, accountId,scan. nextInt())) {
tranfer(conn, pstmt, rs, accountId, scan.next(), scan.nextInt());
}
break;
case 5://잔액조회
System.out.print("계좌번호와 비밀번호를 입력하세요 >> ");
accountId = scan.next();
if(isCorrect(conn, pstmt, rs, accountId,scan. nextInt())) {
int balance = checkBalance(conn, pstmt, rs, accountId);
System.out.println(accountId + "의 잔액은" + balance +"원 입니다.");
}
break;
case 6://전체 계좌정보 조회
aList = getAllAccount(conn, pstmt, rs);
for(Account a : aList) {
System.out.println(a.toString());
}
break;
case 7://종료
break Loop;
}
}
}
}
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전체 Main.java
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package May_0521;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class Main {
//DB연결
String url = "jdbc:oracle:thin:@localhost:1521:xe";
String did = "scott";
String dpw = "tiger";
public static Connection getConnectivity
(String url, String dbId, String dbPwd) {
Connection conn = null;
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
conn = DriverManager.getConnection(url, dbId, dbPwd);
} catch (Exception e) {
e.printStackTrace();
}
return conn;
}
//계좌 정보 DB입력 메소드
public static void addAccount(Connection conn, PreparedStatement pstmt, Account acc) {
/*private String accountId; private int pwd;
private String name; private int balance=0;*/
String sql = "insert into account values(?,?,?,?)";
int result = 0;
try {
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, acc.getAccountId());
pstmt.setInt(2, acc.getPwd());
pstmt.setString(3, acc.getName());
pstmt.setInt(4, acc.getBalance());
result = pstmt.executeUpdate();
} catch(Exception e) {
e.printStackTrace();
}
System.out.print("계좌 정보 저장 완료");
}
//입금
public static void deposit(Connection conn,PreparedStatement pstmt, ResultSet rs ,String accountId, int money) {
String sql = null;
int balance = 0;
try {
//조회하기
sql = "select balance from account where accountId=?";
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, accountId);
rs = pstmt.executeQuery();
rs.next();
balance = rs.getInt(1);
//수정하기
sql = "update account set balance=? where accountId=?";
pstmt = conn.prepareStatement(sql);
pstmt.setInt(1, balance+money);
pstmt.setString(2, accountId);
pstmt.execute();
}catch(Exception e) {
e.printStackTrace();
}System.out.println("입금이 완료되었습니다.");
}
public static boolean isCorrect(Connection conn, PreparedStatement pstmt, ResultSet rs,
String accountId, int pwd) {
String sql = "select * from account ";
boolean result = true;
try {
pstmt = conn.prepareStatement(sql);
rs = pstmt.executeQuery();
while(rs.next()) {
if(accountId.equals(rs.getString(1))&&pwd!=rs.getInt(2)) {
System.out.println("비밀번호가 일치하지 않습니다.");
result = false;
}else if(accountId.equals(rs.getString(1))&&pwd==rs.getInt(2)) {
result = true;
}
}
}catch(Exception e) {
e.printStackTrace();
}
return result;
}
//출금
public static void withdraw(Connection conn,PreparedStatement pstmt,ResultSet rs , String accountId, int money) {
String sql = null;
int balance = 0;
try {
//조회하기
sql = "select balance from account where accountId=?";
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, accountId);
rs = pstmt.executeQuery();
rs.next();
balance = rs.getInt(1);
if(balance >= money) {
sql = "update account set balance=? where accountId=?";
pstmt = conn.prepareStatement(sql);
pstmt.setInt(1, balance-money);
pstmt.setString(2, accountId);
pstmt.execute();
System.out.println("출금이 완료되었습니다.");
}else {
System.out.println("잔액이 충분하지 않습니다.");
}
}catch (Exception e) {
e.printStackTrace();
}
}
//전달
public static void tranfer(Connection conn,PreparedStatement pstmt, ResultSet rs,
String accountId, String target ,int money) {
String sql = null;
int balance = 0;
int targetBalance;
try {
sql = "select balance from account where accountId=?";
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, accountId);
rs = pstmt.executeQuery();
rs.next();
balance = rs.getInt(1);
if(balance >= money) {
sql = "select balance from account where accountId=?";
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, target);
rs = pstmt.executeQuery();
rs.next();
targetBalance = rs.getInt(1);
//잔액 추가
sql = "update account set balance=? where accountId=?";
pstmt = conn.prepareStatement(sql);
pstmt.setInt(1, targetBalance+money);
pstmt.setString(2, target);
pstmt.execute();
//잔액 빠짐
sql = "update account set balance=? where accountId=?";
pstmt = conn.prepareStatement(sql);
pstmt.setInt(1, balance-money);
pstmt.setString(2, accountId);
pstmt.execute();
}else {
System.out.println("잔액이 부족합니다.");
}
}catch (Exception e) {
e.printStackTrace();
}
}
//계좌 금액 조회
public static int checkBalance(Connection conn, PreparedStatement pstmt, ResultSet rs, String accountId) {
String sql = null;
int balance = 0;
try {
sql = "select balance from account where accountId=?";
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, accountId);
rs = pstmt.executeQuery();
rs.next();
balance = rs.getInt(1);
}catch (Exception e) {
e.printStackTrace();
}
return balance;
}
public static List<Account> getAllAccount(Connection conn, PreparedStatement pstmt, ResultSet rs){
List<Account> aList = new ArrayList<Account>();
String sql = "select * from account";
try {
pstmt = conn.prepareStatement(sql);
rs = pstmt.executeQuery();
while(rs.next()) {
aList.add(new Account(rs.getString("accountId"), rs.getInt("pwd"),
rs.getString("name"), rs.getInt("balance")));
}
}catch(Exception e) {
e.printStackTrace();
}
return aList;
}
public static void main(String[] args) {
String url = "jdbc:oracle:thin:@localhost:1521:xe";
String dbId = "scott";
String dbPwd = "tiger";
Scanner scan = new Scanner(System.in);
int select;
String accountId = null;;
ResultSet rs = null;
PreparedStatement pstmt = null;
Connection conn = getConnectivity(url, dbId, dbPwd);
List<Account> aList = null;
Loop:
while(true) {
System.out.println("---------------------------------------------------------------------");
System.out.println("1.계좌개설 | 2.입금 | 3.출금 | 4.송금 | 5.잔액조회 | 6.전체계좌조회 | 7.프로그램 종료|");
System.out.println("---------------------------------------------------------------------");
System.out.print("메뉴를 선택하세요 >>");
select = scan.nextInt();
switch(select) {
case 1://계좌 추가
System.out.print("계좌번호, 비밀번호, 이름, 최초 입금액을 입력하세요 >> ");
Account acc = new Account(scan.next(), scan.nextInt(), scan.next(), scan.nextInt());
addAccount(conn, pstmt, acc);
break;
case 2://입금
System.out.print("계좌번호와 입금액을 입력하세요 >> ");
deposit(conn, pstmt, rs, scan.next(), scan.nextInt());
break;
case 3://출금
System.out.print("계좌번호와, 비밀번호, 출금액을 입력하세요 >> ");
accountId = scan.next();
if(isCorrect(conn, pstmt, rs, accountId, scan.nextInt())) {
withdraw(conn, pstmt, rs, accountId, scan.nextInt());
}
break;
case 4://송금
System.out.print("계좌번호, 비밀번호, 송금받을 계좌번호, 송금액을 입력하세요 >> ");
accountId = scan.next();
if(isCorrect(conn, pstmt, rs, accountId,scan. nextInt())) {
tranfer(conn, pstmt, rs, accountId, scan.next(), scan.nextInt());
}
break;
case 5://잔액조회
System.out.print("계좌번호와 비밀번호를 입력하세요 >> ");
accountId = scan.next();
if(isCorrect(conn, pstmt, rs, accountId,scan. nextInt())) {
int balance = checkBalance(conn, pstmt, rs, accountId);
System.out.println(accountId + "의 잔액은" + balance +"원 입니다.");
}
break;
case 6://전체 계좌정보 조회
aList = getAllAccount(conn, pstmt, rs);
for(Account a : aList) {
System.out.println(a.toString());
}
break;
case 7://종료
break Loop;
}
}
}
}
|
cs |
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