1+ package com .StudentManagementCRUD ;
2+
3+ import java .sql .Connection ;
4+ import java .sql .PreparedStatement ;
5+ import java .sql .ResultSet ;
6+ import java .sql .SQLException ;
7+ import java .sql .Statement ;
8+
9+ public class StudentOp {
10+
11+ public void addStudent (int studentId , String studentName , int studentAge , double sgpa , String phNumber ) {
12+ try (Connection conn = DatabaseConnection .getConnection ()) {
13+ String query = "INSERT INTO Students (studentId, studentName, studentAge, sgpa, phNumber) VALUES (?, ?, ?, ?, ?)" ;
14+ PreparedStatement stmt = conn .prepareStatement (query );
15+ stmt .setInt (1 , studentId );
16+ stmt .setString (2 , studentName );
17+ stmt .setInt (3 , studentAge );
18+ stmt .setDouble (4 , sgpa );
19+ stmt .setString (5 , phNumber );
20+
21+ stmt .executeUpdate ();
22+ } catch (SQLException e ) {
23+ e .printStackTrace ();
24+ }
25+ }
26+
27+ public void displayStudents () {
28+ try (Connection conn = DatabaseConnection .getConnection ()) {
29+ String query = "SELECT * FROM Students" ;
30+ Statement stmt = conn .createStatement ();
31+ ResultSet rs = stmt .executeQuery (query );
32+
33+ while (rs .next ()) {
34+ System .out .println ("ID: " + rs .getInt ("studentId" ));
35+ System .out .println ("Name: " + rs .getString ("studentName" ));
36+ System .out .println ("Age: " + rs .getInt ("studentAge" ));
37+ System .out .println ("CGPA: " + rs .getDouble ("sgpa" ));
38+ System .out .println ("Phone Number: " + rs .getString ("phNumber" ));
39+ System .out .println ("-------------------------" );
40+ }
41+ } catch (SQLException e ) {
42+ e .printStackTrace ();
43+ }
44+ }
45+
46+ public void findStudent (int searchId ) {
47+ try (Connection conn = DatabaseConnection .getConnection ()) {
48+ String query = "SELECT * FROM Students WHERE studentId = ?" ;
49+ PreparedStatement stmt = conn .prepareStatement (query );
50+ stmt .setInt (1 , searchId );
51+
52+ ResultSet rs = stmt .executeQuery ();
53+ if (rs .next ()) {
54+ System .out .println ("ID: " + rs .getInt ("studentId" ));
55+ System .out .println ("Name: " + rs .getString ("studentName" ));
56+ System .out .println ("Age: " + rs .getInt ("studentAge" ));
57+ System .out .println ("CGPA: " + rs .getDouble ("sgpa" ));
58+ System .out .println ("Phone Number: " + rs .getString ("phNumber" ));
59+ } else {
60+ System .out .println ("Student not found" );
61+ }
62+ } catch (SQLException e ) {
63+ e .printStackTrace ();
64+ }
65+ }
66+
67+ public void removeStudnet (int removeId ) {
68+ try (Connection conn = DatabaseConnection .getConnection ()) {
69+ String query = "DELETE FROM Students WHERE studentId = ?" ;
70+ PreparedStatement stmt = conn .prepareStatement (query );
71+ stmt .setInt (1 , removeId );
72+
73+ int rowsAffected = stmt .executeUpdate ();
74+ if (rowsAffected > 0 ) {
75+ System .out .println ("Student removed successfully." );
76+ } else {
77+ System .out .println ("Student not found." );
78+ }
79+ } catch (SQLException e ) {
80+ e .printStackTrace ();
81+ }
82+ }
83+
84+ public void updateStudent (int studentId , String newName , int newAge , double newSgpa , String newPhoneNumber ) {
85+ try (Connection conn = DatabaseConnection .getConnection ()) {
86+ String query = "UPDATE Students SET studentName = ?, studentAge = ?, sgpa = ?, phNumber = ? WHERE studentId = ?" ;
87+ PreparedStatement stmt = conn .prepareStatement (query );
88+
89+ stmt .setString (1 , newName ); // New Name
90+ stmt .setInt (2 , newAge ); // New Age
91+ stmt .setDouble (3 , newSgpa ); // New SGPA
92+ stmt .setString (4 , newPhoneNumber ); // New Phone Number
93+ stmt .setInt (5 , studentId ); // Where studentId matches
94+
95+ int rowsAffected = stmt .executeUpdate ();
96+ if (rowsAffected > 0 ) {
97+ System .out .println ("Student details updated successfully." );
98+ } else {
99+ System .out .println ("Student not found." );
100+ }
101+ } catch (SQLException e ) {
102+ e .printStackTrace ();
103+ }
104+ }
105+ }
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