Banking application

banking application/Prerequisites.md

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+# Software Prerequisite:
+
+1. MySQL
+2. Eclipse
+
+## Databases Setup:
+
+Step 1: Create Database name bank
+
+Step 2: Create Table name customer
+
+// Create a database 
+CREATE DATABASE BANK; 
+
+
+// Create table
+CREATE TABLE `customer` (
+
+ `ac_no` int NOT NULL AUTO_INCREMENT,
+
+ `cname` varchar(45) DEFAULT NULL,
+
+ `balance` varchar(45) DEFAULT NULL,
+
+ `pass_code` int DEFAULT NULL,
+
+ PRIMARY KEY (`ac_no`),
+
+ UNIQUE KEY `cname_UNIQUE` (`cname`)
+
+) ;
+## Eclipse Project Setup:
+
+Create New Project
+Create A package name banking
+
+
+## File configuration
+
+Create a Connection class in the banking package
+
+## Step 1: Include JDBC Driver for MySQL
+
+// register jdbc Driver 
+
+String mysqlJDBCDriver = "com.mysql.cj.jdbc.Driver";
+
+Class.forName(mysqlJDBCDriver);
+
+## Step 2: Create Connection Class using MySQL username and password
+
+// Create Connection
+
+String url = "jdbc:mysql://localhost:3306/mydata";
+
+String user = "root";
+
+String pass = "123";
+
+con = DriverManager.getConnection(url, user, pass);

banking application/bank.java

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+package banking;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+public class bank {
+public static void main(String args[]) //main class of bank
+throws IOException
+{
+
+BufferedReader sc = new BufferedReader(
+new InputStreamReader(System.in));
+String name = "";
+int pass_code;
+int ac_no;
+int ch;
+
+while (true) {
+System.out.println(
+"\n ->|| Welcome to InBank ||<- \n");
+System.out.println("1)Create Account");
+System.out.println("2)Login Account");
+
+try {
+System.out.print("\n Enter Input:"); //user input
+ch = Integer.parseInt(sc.readLine());
+
+switch (ch) {
+case 1:
+try {
+System.out.print(
+"Enter Unique UserName:");
+name = sc.readLine();
+System.out.print(
+"Enter New Password:");
+pass_code = Integer.parseInt(
+sc.readLine());
+
+if (bankManagement.createAccount(
+name, pass_code)) {
+System.out.println(
+"MSG : Account Created Successfully!\n");
+}
+else {
+System.out.println(
+"ERR : Account Creation Failed!\n");
+}
+}
+catch (Exception e) {
+System.out.println(
+" ERR : Enter Valid Data::Insertion Failed!\n");
+}
+break;
+
+case 2:
+try {
+System.out.print(
+"Enter UserName:");
+name = sc.readLine();
+System.out.print(
+"Enter Password:");
+pass_code = Integer.parseInt(
+sc.readLine());
+
+if (bankManagement.loginAccount(
+name, pass_code)) {
+System.out.println(
+"MSG : Logout Successfully!\n");
+}
+else {
+System.out.println(
+"ERR : login Failed!\n");
+}
+}
+catch (Exception e) {
+System.out.println(
+" ERR : Enter Valid Data::Login Failed!\n");
+}
+
+break;
+
+default:
+System.out.println("Invalid Entry!\n");
+}
+
+if (ch == 5) {
+System.out.println(
+"Exited Successfully!\n\n Thank You :)");
+break;
+}
+}
+catch (Exception e) {
+System.out.println("Enter Valid Entry!");
+}
+}
+sc.close();
+}
+}

banking application/bankmanagemment.java

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+package banking;
+
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.SQLIntegrityConstraintViolationException;
+import java.sql.Statement;
+
+public class bankManagement { // these class provides all
+// bank method
+
+private static final int NULL = 0;
+
+static Connection con = connection.getConnection();
+static String sql = "";
+public static boolean
+createAccount(String name,
+int passCode) // create account function
+{
+try {
+// validation
+if (name == "" || passCode == NULL) {
+System.out.println("All Field Required!");
+return false;
+}
+// query
+Statement st = con.createStatement();
+sql = "INSERT INTO customer(cname,balance,pass_code) values('"
++ name + "',1000," + passCode + ")";
+
+// Execution
+if (st.executeUpdate(sql) == 1) {
+System.out.println(name
++ ", Now You Login!");
+return true;
+}
+// return
+}
+catch (SQLIntegrityConstraintViolationException e) {
+System.out.println("Username Not Available!");
+}
+catch (Exception e) {
+e.printStackTrace();
+}
+return false;
+}
+public static boolean
+loginAccount(String name, int passCode) // login method
+{
+try {
+// validation
+if (name == "" || passCode == NULL) {
+System.out.println("All Field Required!");
+return false;
+}
+// query
+sql = "select * from customer where cname='"
++ name + "' and pass_code=" + passCode;
+PreparedStatement st
+= con.prepareStatement(sql);
+ResultSet rs = st.executeQuery();
+// Execution
+BufferedReader sc = new BufferedReader(
+new InputStreamReader(System.in));
+
+if (rs.next()) {
+// after login menu driven interface method
+
+int ch = 5;
+int amt = 0;
+int senderAc = rs.getInt("ac_no");
+;
+int receiveAc;
+while (true) {
+try {
+System.out.println(
+"Hallo, "
++ rs.getString("cname"));
+System.out.println(
+"1)Transfer Money");
+System.out.println("2)View Balance");
+System.out.println("5)LogOut");
+
+System.out.print("Enter Choice:");
+ch = Integer.parseInt(
+sc.readLine());
+if (ch == 1) {
+System.out.print(
+"Enter Receiver A/c No:");
+receiveAc = Integer.parseInt(
+sc.readLine());
+System.out.print(
+"Enter Amount:");
+amt = Integer.parseInt(
+sc.readLine());
+
+if (bankManagement
+.transferMoney(
+senderAc, receiveAc,
+amt)) {
+System.out.println(
+"MSG : Money Sent Successfully!\n");
+}
+else {
+System.out.println(
+"ERR : Failed!\n");
+}
+}
+else if (ch == 2) {
+
+bankManagement.getBalance(
+senderAc);
+}
+else if (ch == 5) {
+break;
+}
+else {
+System.out.println(
+"Err : Enter Valid input!\n");
+}
+}
+catch (Exception e) {
+e.printStackTrace();
+}
+}
+}
+else {
+return false;
+}
+// return
+return true;
+}
+catch (SQLIntegrityConstraintViolationException e) {
+System.out.println("Username Not Available!");
+}
+catch (Exception e) {
+e.printStackTrace();
+}
+return false;
+}
+public static void
+getBalance(int acNo) // fetch balance method
+{
+try {
+
+// query
+sql = "select * from customer where ac_no="
++ acNo;
+PreparedStatement st
+= con.prepareStatement(sql);
+
+ResultSet rs = st.executeQuery(sql);
+System.out.println(
+"-----------------------------------------------------------");
+System.out.printf("%12s %10s %10s\n",
+"Account No", "Name",
+"Balance");
+
+// Execution
+
+while (rs.next()) {
+System.out.printf("%12d %10s %10d.00\n",
+rs.getInt("ac_no"),
+rs.getString("cname"),
+rs.getInt("balance"));
+}
+System.out.println(
+"-----------------------------------------------------------\n");
+}
+catch (Exception e) {
+e.printStackTrace();
+}
+}
+public static boolean transferMoney(int sender_ac,
+int reveiver_ac,
+int amount)
+throws SQLException // transfer money method
+{
+// validation
+if (reveiver_ac == NULL || amount == NULL) {
+System.out.println("All Field Required!");
+return false;
+}
+try {
+con.setAutoCommit(false);
+sql = "select * from customer where ac_no="
++ sender_ac;
+PreparedStatement ps
+= con.prepareStatement(sql);
+ResultSet rs = ps.executeQuery();
+
+if (rs.next()) {
+if (rs.getInt("balance") < amount) {
+System.out.println(
+"Insufficient Balance!");
+return false;
+}
+}
+
+Statement st = con.createStatement();
+
+// debit
+con.setSavepoint();
+
+sql = "update customer set balance=balance-"
++ amount + " where ac_no=" + sender_ac;
+if (st.executeUpdate(sql) == 1) {
+System.out.println("Amount Debited!");
+}
+
+// credit
+sql = "update customer set balance=balance+"
++ amount + " where ac_no=" + reveiver_ac;
+st.executeUpdate(sql);
+
+con.commit();
+return true;
+}
+catch (Exception e) {
+e.printStackTrace();
+con.rollback();
+}
+// return
+return false;
+}
+}