Jdbc tasks

JDBC Tasks/DatabaseTask1/.gitignore

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+### IntelliJ IDEA ###
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

JDBC Tasks/DatabaseTask1/DatabaseTask1.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="module-library" exported="">
+      <library>
+        <CLASSES>
+          <root url="jar://$MODULE_DIR$/../../../mysql-connector.jar!/" />
+        </CLASSES>
+        <JAVADOC />
+        <SOURCES />
+      </library>
+    </orderEntry>
+  </component>
+</module>

JDBC Tasks/DatabaseTask1/README.md

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+# JDBC Tasks
+
+## Task 1
+
+ Java application for connecting to a database on MySQL Server and executing a query which selects numbers of fields from a table and prints it with any specific format, by using load a specific driver and getting the connection using DriverManager class.
+
+<center> <img src="screenshot.PNG" width=700 length=300> </center>
+<center> <img src="MYSQL screenshot.PNG" width=700 length=300> </center>
+
+
+## Project Description
+
+### Database Setup
+1. Install Xampp.
+2. Start Apache and MYSQL modules.
+3. Open phpMyAdmin.
+4. Create a new database
+5. Import [SQL code](https://github.com/amira921/JobHacker-System/blob/JDBCTasks/JDBC%20Tasks/DatabaseTask1/db.sql).
+6. Install [MYSQL driver](https://static.javatpoint.com/src/jdbc/mysql-connector.jar).
+7. Add driver in project dependencies.
+
+
+## Java Application
+Singleton pattern used for database class.
+Singleton class is created for the database that has only one instance and provides a global point of access to it, it Saves memory because the object is not created at each request, only a single instance is reused again and again.
+
+**UML diagram**
+<center><img src="class diagram.PNG" width=300 higth=300></center>

JDBC Tasks/DatabaseTask1/db.sql

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+CREATE TABLE `classroom` (
+  `Id` int(50) NOT NULL AUTO_INCREMENT,
+  `Name` varchar(100) NOT NULL,
+  `GPA` double NOT NULL,
+  `Gender` enum('F','M') NOT NULL,
+  PRIMARY KEY(`Id`)
+);
+
+--
+-- Dumping data for table `classroom`
+--
+
+INSERT INTO `classroom` (`Id`, `Name`, `GPA`, `Gender`) VALUES
+(NULL, 'Amira Taha Ahmed', 4.00, 'F'),
+(NULL, 'Ahmed Taha Ahmed', 3.03, 'M'),
+(NULL, 'Mai Ali Mohammed', 3.99, 'F'),
+(NULL, 'Nour Mohammed Ali', 2.78, 'M');

JDBC Tasks/DatabaseTask1/src/DBSingleton.java

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+import java.io.IOException;
+import java.sql.*;
+import java.util.Formatter;
+
+// use Singleton pattern
+class DBSingleton {
+    private static DBSingleton connection;
+    private DBSingleton(){}
+
+    public static DBSingleton getInstance(){
+        if(connection == null) connection = new DBSingleton();
+        return connection;
+    }
+
+    public static Connection getConnection() throws SQLException, ClassNotFoundException {
+        Connection connection = null;
+        Class.forName("com.mysql.jdbc.Driver"); // loading mysql driver to establish database connection
+        connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/db", "root", "");
+        return connection;
+    }
+
+    public void viewRecords() throws SQLException, ClassNotFoundException, IOException {
+        Connection con = getConnection();
+        CallableStatement ps = con.prepareCall("{call GetStudents()}");
+        ResultSet rs = ps.executeQuery();
+
+        System.out.println("Classroom Info");
+        Formatter format = new Formatter();
+        format.format("%20s %20s %20s %20s\n", "Student Id", "Student Name", "Student Gender" , "Student GPA");
+        while (rs.next()) {
+            format.format("%20s %20s %20s %20s\n", rs.getInt(1), rs.getString(2), rs.getString(4) , rs.getDouble(3));
+        }
+        System.out.println(format);
+
+        con.close();
+    }
+}
+

JDBC Tasks/DatabaseTask1/src/Main.java

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+import java.io.IOException;
+import java.sql.SQLException;
+
+public class Main {
+    public static void main(String[] args) throws SQLException, ClassNotFoundException, IOException {
+        DBSingleton classroom =  DBSingleton.getInstance();
+        classroom.viewRecords();
+    }
+}

JDBC Tasks/DatabaseTask2/.gitignore

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+### IntelliJ IDEA ###
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store