标签：cardInfo 实体类 银行卡 ATM resultSet number System connection statement
ATM机案例3之银行卡实体类以及银行卡操作类（四）
目录
一、CardInfo(银行卡实体类)
点击查看代码
public class CardInfo {
private int number;
private double balance;
//此处用于初始化银行卡状态
private String status = "可用";
private int accountid;
private int bankid;
@Override
//用于显示银行卡内数据
public String toString() {
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.append("卡号：").append(number);
stringBuilder.append("\t余额：").append(balance);
stringBuilder.append("\t状态：").append(status);
stringBuilder.append("\t账户id：").append(accountid);
stringBuilder.append("\t银行id：").append(bankid);
return stringBuilder.toString();
}
public int getNumber() {
return number;
}
public void setNumber(int number) {
this.number = number;
}
public double getBalance() {
return balance;
}
public void setBalance(double balance) {
this.balance = balance;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
public int getAccountid() {
return accountid;
}
public void setAccountid(int accountid) {
this.accountid = accountid;
}
public int getBankid() {
return bankid;
}
public void setBankid(int bankid) {
this.bankid = bankid;
}
}
二、CardDAO(银行卡操作)
点击查看代码
public class CardDAO {
//增加、修改、查询
//增加数据
public void saveCardInfo() {
CardInfo cardInfo = new CardInfo();
Connection connection = DBUtils.getConnection();
Statement statement = null;
Scanner scanner = new Scanner(System.in);
System.out.println("请设置卡号：");
int number = scanner.nextInt();
if (judge(number)) {
try {
statement = connection.createStatement();
cardInfo.setNumber(number);
System.out.println("请设置卡内初始余额：");
cardInfo.setBalance(scanner.nextDouble());
System.out.println("请设置银行卡所属账户ID：");
cardInfo.setAccountid(scanner.nextInt());
System.out.println("请设置银行卡所属银行ID：");
cardInfo.setBankid(scanner.nextInt());
String sql1 = "insert into t_bank_card values(%d,%f,'%s',%d,%d)";
String sql2 = String.format(sql1, cardInfo.getNumber(), cardInfo.getBalance(),
cardInfo.getStatus(), cardInfo.getAccountid(), cardInfo.getBankid());
System.out.println(sql2);
statement.executeUpdate(sql2);
scanner.close();
DBUtils.close(statement, connection);
} catch (SQLException e) {
e.printStackTrace();
} finally {
scanner.close();
DBUtils.close(statement, connection);
}
} else {
System.out.println("该卡号已存在！");
}
}
//修改数据(暂定,没啥用)
public void updateCardInfo() {
//todo
CardInfo cardInfo = new CardInfo();
Connection connection = DBUtils.getConnection();
Statement statement = null;
Scanner scanner = new Scanner(System.in);
System.out.println("请输入要修改的卡号：");
int number = scanner.nextInt();
if (judge(number) == false) {
try {
statement = connection.createStatement();
System.out.println("请输入新的卡号：");
cardInfo.setNumber(scanner.nextInt());
System.out.println("请输入新的余额：");
cardInfo.setBalance(scanner.nextDouble());
String status = "不可用";
System.out.println("请输入新的账户ID：");
cardInfo.setAccountid(scanner.nextInt());
System.out.println("请输入新的银行ID：");
cardInfo.setBankid(scanner.nextInt());
String sql1 = "update t_bank_card set " +
"card_number = %d,balance = %f,status = '%s',account_id = %d,bank_id = %d" +
"where card_number = " + number;
String sql2 = String.format(sql1, cardInfo.getNumber(), cardInfo.getBalance(),
cardInfo.getStatus(), cardInfo.getAccountid(), cardInfo.getBankid());
System.out.println(sql2);
statement.executeUpdate(sql2);
scanner.close();
DBUtils.close(statement, connection);
} catch (SQLException e) {
e.printStackTrace();
} finally {
scanner.close();
DBUtils.close(statement, connection);
}
} else {
System.out.println("此卡号不存在！");
}
}
//删除银行卡数据,改变银行卡状态为不可用
public void deleteCardInfo() {
Connection connection = DBUtils.getConnection();
Statement statement = null;
Scanner scanner = new Scanner(System.in);
System.out.println("请输入要删除的卡号：");
int number = scanner.nextInt();
if (judge(number) == false) {
try {
statement = connection.createStatement();
String status="不可用";
String sql1 = "update t_bank_card set " +
"status='%s'" + status;
String sql2 = String.format(sql1, number);
statement.executeUpdate(sql2);
System.out.println(sql2);
scanner.close();
DBUtils.close(statement, connection);
} catch (SQLException e) {
e.printStackTrace();
} finally {
scanner.close();
DBUtils.close(statement, connection);
}
} else {
System.out.println("此卡号不存在！");
}
}
//显示银行卡数据(暂定,没啥用)
public void showCardInfo() {
//todo
Connection connection = DBUtils.getConnection();
Statement statement = null;
ResultSet resultSet = null;
try {
statement = connection.createStatement();
resultSet = statement.executeQuery("select * from t_bank_card");
List<CardInfo> list = new ArrayList<>();
while (resultSet.next()) {
CardInfo cardInfo = new CardInfo();
cardInfo.setNumber(resultSet.getInt("card_number"));
cardInfo.setBalance(resultSet.getInt("balance"));
cardInfo.setStatus((resultSet.getString("status")));
cardInfo.setAccountid(resultSet.getInt("account_id"));
cardInfo.setBankid(resultSet.getInt("bank_id"));
list.add(cardInfo);
}
for (CardInfo cardInfo : list) {
System.out.println(cardInfo);
}
DBUtils.close(resultSet, statement, connection);
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtils.close(resultSet, statement, connection);
}
}
//条件查询1：卡号查询（通过卡号找到银行卡信息）
public static CardInfo findByNumber(int number) {
CardInfo cardInfo = new CardInfo();
Connection connection = null;
Statement statement = null;
ResultSet resultSet = null;
try {
connection = DBUtils.getConnection();
statement = connection.createStatement();
resultSet = statement.executeQuery("select * from T_BANK_CARD where card_number = " + number);
if (resultSet == null) {
System.out.println("空值");
} else {
while (resultSet.next()) {
cardInfo.setNumber(resultSet.getInt("card_number"));
cardInfo.setBalance(resultSet.getDouble("balance"));
cardInfo.setStatus(resultSet.getString("status"));
cardInfo.setAccountid(resultSet.getInt("account_id"));
cardInfo.setBankid(resultSet.getInt("bank_id"));
}
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtils.close(resultSet, statement, connection);
}
return cardInfo;
}
//判断数据库是否存在数据,true代表无数据，false代表有数据
public static boolean judge(int number) {
boolean judgement = false;
Connection connection = DBUtils.getConnection();
Statement statement = null;
ResultSet resultSet = null;
try {
int login = 0;
statement = connection.createStatement();
resultSet = statement.executeQuery(
"select count(1) from T_BANK_CARD where card_number=" + number);
while (resultSet.next()) {
login = resultSet.getInt("count(1)");
}
if (login == 0) {
judgement = true;
} else {
judgement = false;
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtils.close(resultSet, statement, connection);
return judgement;
}
}
//余额增加
public void inputMoney(double money,int number) {
Connection connection = DBUtils.getConnection();
Statement statement = null;
try {
statement = connection.createStatement();
String string = "UPDATE T_BANK_CARD SET balance = BALANCE + %f WHERE CARD_NUMBER = %d";
String sql = String.format(string, money, number);
statement.executeUpdate(sql);
DBUtils.close(statement, connection);
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtils.close(statement,connection);
}
}
//余额减少
public void outputMoney(double money, int number) {
//先判断转出账户存在且余额足够
if (!judge(number) && findByNumber(number).getBalance() >= money) {
Connection connection = DBUtils.getConnection();
Statement statement = null;
try {
statement = connection.createStatement();
String string = "UPDATE T_BANK_CARD SET balance = BALANCE - %f WHERE CARD_NUMBER = %d";
String sql = String.format(string, money, number);
statement.executeUpdate(sql);
DBUtils.close(statement, connection);
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtils.close(statement, connection);
}
} else if (judge(number)) {
System.out.println("该账户不存在！");
} else {
System.out.println("账户余额不足！");
}
}
}
标签：cardInfo,实体类,银行卡,ATM,resultSet,number,System,connection,statement 来源： https://www.cnblogs.com/black-jay-blogs/p/15585597.html
本站声明： 1. iCode9 技术分享网（下文简称本站）提供的所有内容，仅供技术学习、探讨和分享； 2. 关于本站的所有留言、评论、转载及引用，纯属内容发起人的个人观点，与本站观点和立场无关； 3. 关于本站的所有言论和文字，纯属内容发起人的个人观点，与本站观点和立场无关； 4. 本站文章均是网友提供，不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属；如您发现该文章侵犯了您的权益，可联系我们第一时间进行删除； 5. 本站为非盈利性的个人网站，所有内容不会用来进行牟利，也不会利用任何形式的广告来间接获益，纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。