Q16
Question 16
Create a table 'Student' and ‘Teacher’ in 'College' database and insert two rows in this newly created table using JDBC API and do the following:
Update an already created table 'Teacher' in 'College' database by updating a teacher's name, with "Dr." appended before the name, whose name is "Rita".
Repeat the same thing for all the teachers using PreparedStatement.
Delete the student with ID=3 from 'Student' database.
Insert two students to the ResultSet returned by the query which selects all students with FirstName="Ayush". The database must also get updated along with ResultSet.
Code
import java.sql.*;
import java.util.Scanner;
public class jdbc_1 {
public static void main(String[] args) throws
SQLException, ClassNotFoundException {
// JDBC URL
final String jdbc_url = "jdbc:mysql://localhost:3306" +
"/College";
// Database credentials
final String user_id = "root";
final String password = "MJK618";
Connection connection = null;
try {
Class.forName("com.mysql.cj.jdbc.Driver");
connection = DriverManager.getConnection(
jdbc_url, user_id, password);
Statement stmt = connection.createStatement();
System.out.println("Connection to the " +
"Database Established." +
"\n\n\tWelcome to the JDBC CRUD " +
"Operations Program");
int ch = 1;
Scanner sc = new Scanner(System.in);
if (ch == 1) {
do {
mainMenu();
ch = sc.nextInt();
switch (ch) {
case 1:
showTables(stmt);
break;
case 2:
showStudentTableRows(stmt);
break;
case 3:
insertRowInStudentTable(stmt);
break;
case 4:
deleteRowThreeStudent(stmt);
break;
case 5:
showRowsAyushFname(stmt);
break;
case 6:
showTeacherTableRows(stmt);
break;
case 7:
insertRowTeacherTable(stmt);
break;
case 8:
addDrToRitaInTeacher(stmt);
break;
case 9:
addDrToAllInTeacher(connection);
break;
case -1:
ch = -1;
break;
default:
System.out.println(
"\n\t XXXXX--" +
" INVALID INPUT --XXXXX \n");
}
} while (ch != -1);
} else {
System.out.println("End");
}
} catch (SQLException e) {
System.out.println("Connection Failed" + e);
} finally {
System.out.println("Connection Closed");
assert connection != null;
connection.close();
}
}
private static void showRowsAyushFname(
Statement stmt) throws SQLException {
ResultSet rs;
stmt.execute("Select * from student " +
"where first_name = 'Ayush'");
rs = stmt.getResultSet();
net.efabrika.util.DBTablePrinter.printResultSet(rs);
}
private static void mainMenu() {
System.out.println("\n--- Menu ---");
System.out.println("1. Show All Table Names");
System.out.println("2. Show all Rows in " +
"Table: student");
System.out.println("3. Insert Row in " +
"Table: student");
System.out.println("4. Delete Row with " +
"ID = 3 in Table: student");
System.out.println("5. Select all Rows " +
"with first_name = 'Ayush' in " +
"Table: student");
System.out.println("6. Show all Rows in " +
"Table: teacher");
System.out.println("7. Insert Row in " +
"Table: teacher");
System.out.println("8. Update Row with " +
"suffix Dr. for first_name 'Rita' " +
"in Table: teacher");
System.out.println("9. Update all Rows with " +
"suffix Dr. for first_name in " +
"Table: teacher");
System.out.println("-1. Exit");
System.out.println("Enter Your Choice: ");
}
private static void addDrToAllInTeacher(
Connection connection) throws SQLException {
PreparedStatement stmt = connection.prepareStatement(
"UPDATE teacher set first_name " +
"= CONCAT('Dr. ',first_name)");
stmt.execute();
System.out.println("Successfully Updated" +
" all teacher's first_name to " +
"Dr. first_name");
}
private static void addDrToRitaInTeacher(
Statement stmt) throws SQLException {
stmt.execute("UPDATE teacher set " +
"first_name = CONCAT('Dr. '," +
"first_name) where first_name = 'Rita'");
System.out.println("Successfully " +
"Updated Rita to Dr. Rita");
}
private static void insertRowTeacherTable(
Statement stmt) throws SQLException {
ResultSet rs;
String query = String.format("SELECT " +
"COLUMN_NAME FROM " +
"INFORMATION_SCHEMA.COLUMNS " +
"where TABLE_NAME = N'teacher'");
stmt.execute(query);
rs = stmt.getResultSet();
net.efabrika.util.DBTablePrinter.printResultSet(rs);
System.out.println("The teacher table " +
"has columns as listed above\n" +
"To insert into teacher " +
"(first_name, last_name, course)\n" +
"Enter the following inputs: ");
Scanner scanner = new Scanner(System.in);
System.out.println("Enter first name: ");
String fname = scanner.nextLine();
System.out.println("Enter last name: ");
String lname = scanner.nextLine();
System.out.println("Enter course of teacher: ");
String coursename = scanner.nextLine();
String query_1 = "insert into teacher(" +
"first_name, last_name, course) " +
"values ('" + fname + "','"
+ lname + "','" + coursename + "')";
stmt.execute(query_1);
System.out.println("Inserted row values(" +
fname + ", " + lname + ", " +
coursename + ") in table teacher\n1 " +
"row affected");
}
private static void showTeacherTableRows(
Statement stmt) throws SQLException {
ResultSet rs;
stmt.executeQuery("SELECT * from teacher");
rs = stmt.getResultSet();
net.efabrika.util.DBTablePrinter.printResultSet(rs);
}
private static void deleteRowThreeStudent(
Statement stmt) throws SQLException {
stmt.execute("DELETE from student where " +
"S_id = 3");
System.out.println("Successfully Deleted " +
"student with S_id = 3");
}
private static void showStudentTableRows(
Statement stmt) throws SQLException {
ResultSet rs;
stmt.executeQuery("SELECT * from student");
rs = stmt.getResultSet();
net.efabrika.util.DBTablePrinter.printResultSet(rs);
}
private static void showTables(
Statement stmt) throws SQLException {
ResultSet rs;
stmt.executeQuery("SHOW tables ");
rs = stmt.getResultSet();
net.efabrika.util.DBTablePrinter.printResultSet(rs);
}
private static void insertRowInStudentTable(
Statement stmt) throws SQLException {
ResultSet rs;
String query = String.format("SELECT COLUMN_NAME" +
" FROM INFORMATION_SCHEMA.COLUMNS " +
"where TABLE_NAME = N'student'");
stmt.execute(query);
rs = stmt.getResultSet();
net.efabrika.util.DBTablePrinter.printResultSet(rs);
System.out.println("The student table has " +
"columns as listed above\n" +
"To insert into student(roll_no, " +
"first_name, last_name, course, " +
"address)\n" +
"Enter the following inputs: ");
Scanner scanner = new Scanner(System.in);
System.out.println("Enter roll number: ");
int roll = scanner.nextInt();
scanner.nextLine();
System.out.println("Enter first name: ");
String fname = scanner.nextLine();
System.out.println("Enter last name: ");
String lname = scanner.nextLine();
System.out.println("Enter course of " +
"student: ");
String coursename = scanner.nextLine();
System.out.println("Enter address of " +
"student: ");
String addr = scanner.nextLine();
String query_1 = "insert into student(" +
"roll_no, first_name, last_name, " +
"course, address) values ('"
+ roll + "','" + fname + "','"
+ lname + "','" + coursename +
"','" + addr + "')";
stmt.execute(query_1);
System.out.println("Inserted row values(" + roll +
", " + fname + ", " + lname + ", "
+ coursename + ", "
+ addr + ") in table student\n1 row affected");
}
}
Output
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