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‎jdbc-tutorial/Handy_MySQL_Commands.docx

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‎jdbc-tutorial/JDBCExample.class

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‎jdbc-tutorial/JDBCExample.java

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// information to run this program
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// to compile the program
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// javac JDBCExample.java
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// first method
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// to run the program
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// java -cp "C:\mysql-connector-java-5.1.49\mysql-connector-java-5.1.49-bin.jar;" JDBCExample
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// or
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// second method
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// set path
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// set path=%path%;C:\mysql-connector-java-5.1.49;
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// java JDBCExample
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// either your can use hostname 127.0.0.1 or localhost
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// default port number 3306
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import java.sql.Connection; // to establish a connection
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import java.sql.DriverManager;
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import java.sql.SQLException;
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public class JDBCExample {
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public static void main(String[] args) {
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// https://docs.oracle.com/javase/8/docs/api/java/sql/package-summary.html#package.description
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// auto java.sql.Driver discovery -- no longer need to load a java.sql.Driver class via Class.forName
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// register JDBC driver, optional since java 1.6
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/*try {
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Class.forName("com.mysql.jdbc.Driver");
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} catch (ClassNotFoundException e) {
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e.printStackTrace();
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}*/
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// auto close connection
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try (Connection conn = DriverManager.getConnection(
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"jdbc:mysql://127.0.0.1:3306/IUT_DB?autoReconnect=true&useSSL=false", "root", "1234")) {
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if (conn != null) {
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System.out.println("Connected to the database!");
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} else {
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System.out.println("Failed to make connection!");
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}
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} catch (SQLException e) {
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System.err.format("SQL State: %s\n%s", e.getSQLState(), e.getMessage());
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}

‎jdbc-tutorial/JdbcSelectTest.java

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import java.sql.*; // Use 'Connection', 'Statement' and 'ResultSet' classes in java.sql package
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// JDK 1.7 and above
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public class JdbcSelectTest { // Save as "JdbcSelectTest.java"
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public static void main(String[] args) {
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try (
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// Step 1: Allocate a database 'Connection' object
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Connection conn = DriverManager.getConnection( "jdbc:mysql://localhost:3306/IUT_DB?autoReconnect=true&useSSL=false", "root", "1234");
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// MySQL: "jdbc:mysql://hostname:port/databaseName", "username", "password"
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// Step 2: Allocate a 'Statement' object in the Connection
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Statement stmt = conn.createStatement();) {
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// Step 3: Execute a SQL SELECT query, the query result
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// is returned in a 'ResultSet' object.
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String strSelect = "select Student_name, studentID from student";
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System.out.println("The SQL query is: " + strSelect); // Echo For debugging
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System.out.println();
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ResultSet rset = stmt.executeQuery(strSelect);
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// Step 4: Process the ResultSet by scrolling the cursor forward via next().
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// For each row, retrieve the contents of the cells with getXxx(columnName).
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System.out.println("The records selected are:");
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int rowCount = 0;
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while(rset.next()) { // Move the cursor to the next row, return false if no more row
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String sname = rset.getString("student_name");
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int sid= rset.getInt("studentID");
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System.out.println(sid+ " " +sname );
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++rowCount;
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}
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System.out.println("Total number of records = " + rowCount);
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} catch(SQLException ex) {
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ex.printStackTrace();
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}
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// Step 5: Close the resources - Done automatically by try-with-resources
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}
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}

‎jdbc-tutorial/JdbcSelectTest_insert.java

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import java.sql.*; // Use 'Connection', 'Statement' and 'ResultSet' classes in java.sql package
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// JDK 1.7 and above
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public class JdbcSelectTest_insert { // Save as "JdbcSelectTest.java"
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public static void main(String[] args) {
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try (
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// Step 1: Allocate a database 'Connection' object
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Connection conn = DriverManager.getConnection( "jdbc:mysql://localhost:3306/IUT_DB?autoReconnect=true&useSSL=false", "root", "1234");
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// MySQL: "jdbc:mysql://hostname:port/databaseName", "username", "password"
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// Step 2: Allocate a 'Statement' object in the Connection
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Statement stmt = conn.createStatement();) {
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// Step 3: Execute a SQL SELECT query, the query result
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// is returned in a 'ResultSet' object.
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int sid=999;
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String sname="Muhaamad";
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String strSelect = "insert into student values (" +sid+","+"'" +sname+"')";
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System.out.println("The SQL query is: " + strSelect); // Echo For debugging
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System.out.println();
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int count = stmt.executeUpdate(strSelect);
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// Step 4: Process the ResultSet by scrolling the cursor forward via next().
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// For each row, retrieve the contents of the cells with getXxx(columnName).
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conn.close();
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} catch(SQLException ex) {
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ex.printStackTrace();
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}
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// Step 5: Close the resources - Done automatically by try-with-resources
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}
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}
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// to delete record
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// String strSelect = "delete from student where studentid ="+ sid;

‎jdbc-tutorial/Readme.md

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# MySQL
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- How to open MySQL command line: https://www.tutorialspoint.com/how-to-open-mysql-command-line-on-windows10
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- Key points:
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- Connection between application and database
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- How to retrieve the data from database
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- How to insert data into database
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- JBDC - Java Database Connectivity
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- `set path=%path%;C:\mysql-connector-java-5.1.49;`
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- `javac -cp "C:\mysql-connector-java-5.1.49\mysql-connector-java-5.1.49-bin.jar;" JDBCExample.java`
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- `executeUpdate() `: This method is used for execution of DML statement(INSERT, UPDATE and DELETE) which is return int value, count of the affected rows.
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- `executeQuery()` : This method is used to retrieve data from database using SELECT query.

‎lab-08-mysql/IUT_BMI.java

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import java.util.Scanner; // Import the Scanner class
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import java.sql.*; // Use 'Connection', 'Statement' and 'ResultSet' classes in java.sql package
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public class IUT_BMI {
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public static void main(String[] args) {
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try (
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// Allocate a database 'Connection' object
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Connection conn = DriverManager.getConnection( "jdbc:mysql://localhost:3306/IUT_BMI?autoReconnect=true&useSSL=false", "root", "1234");
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// Allocate a 'Statement' object in the Connection
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Statement stmt = conn.createStatement();
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) {
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Scanner input = new Scanner(System.in); // Create a Scanner object
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int option, isExit; // Initializing some variables
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int employeeID, employeeHeight, employeeWeight;
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String employeeName;
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do { // Loop for reusing the program
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option = showMenu(); // The option value
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switch (option){
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case 1:
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System.out.println("***** DISPLAY RECORDS *****");
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// Execute a SQL SELECT query, the query result is returned in a 'ResultSet' object.
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String strSelect = "SELECT * FROM Employee_BMI; ";
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System.out.println("The SQL query is: " + strSelect); // Echo For debugging
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System.out.println();
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ResultSet rset = stmt.executeQuery(strSelect);
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// Process the ResultSet by scrolling the cursor forward via next().
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// For each row, retrieve the contents of the cells with getXxx(columnName).
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System.out.println("The records selected are:");
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int rowCount = 0;
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while(rset.next()) { // Move the cursor to the next row, return false if no more row
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employeeID = rset.getInt("employeeID");
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employeeHeight = rset.getInt("employeeHeight");
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employeeWeight = rset.getInt("employeeWeight");
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employeeName = rset.getString("employeeName");
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System.out.println(employeeID + " " + employeeName + " " + employeeHeight + " " + employeeWeight );
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rowCount++;
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}
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System.out.println("Total number of records = " + rowCount);
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break;
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case 2:
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System.out.println("***** INSERT RECORD *****");
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//Execute a SQL SELECT query, the query result is returned in a 'ResultSet' object.
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System.out.print("Employee ID: "); employeeID = (input.nextInt());
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System.out.print("Employee height: "); employeeHeight = (input.nextInt());
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System.out.print("Employee weight: "); employeeWeight = (input.nextInt());
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System.out.print("Employee name: "); employeeName = (input.next());
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strSelect = "INSERT INTO Employee_BMI VALUES(" + employeeID + "," + "'" + employeeName + "'," + " " + employeeHeight+"," + " " + employeeWeight+")";
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System.out.println("The SQL query is: " + strSelect); // Echo For debugging
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int count = stmt.executeUpdate(strSelect);
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break;
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case 3:
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System.out.println("***** UPDATE RECORD *****");
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// Execute a SQL SELECT query, the query result is returned in a 'ResultSet' object.
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System.out.print("Employee ID: "); employeeID = (input.nextInt());
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System.out.print("Employee height: "); employeeHeight = (input.nextInt());
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System.out.print("Employee weight: "); employeeWeight = (input.nextInt());
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// SQL query to update record
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strSelect ="UPDATE Employee_BMI SET employeeWeight=" + employeeWeight + ", employeeHeight=" + employeeHeight + " WHERE employeeID="+ employeeID;
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System.out.println("The SQL query is: " + strSelect); // Echo For debugging
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count= stmt.executeUpdate(strSelect);
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break;
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case 4:
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System.out.println("***** DELETE RECORD *****");
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// Execute a SQL SELECT query, the query result is returned in a 'ResultSet' object.
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System.out.print("Employee ID: "); employeeID = (input.nextInt());
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// to delete record
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strSelect ="DELETE FROM Employee_BMI WHERE employeeID=" + employeeID;
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System.out.println("The SQL query is: " + strSelect); // Echo For debugging
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System.out.println();
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count = stmt.executeUpdate(strSelect);
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break;
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case 0:
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System.out.println("Quitting Program...");
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System.exit(0); // program ends
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break;
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default:
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System.out.println("Please choose a valid option!");
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} // End of switch
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System.out.print("\nDo you want to continue? (0.No 1.Yes) - ");
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isExit = input.nextInt(); // validation checking
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} while(isExit == 1);
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} catch(SQLException ex) {
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ex.printStackTrace();
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}
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} // end of main()
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public static int showMenu() {
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Scanner input = new Scanner(System.in); // Create a Scanner object
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int option = 0;
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// Printing menu to screen
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System.out.println("\n***** MAIN MENU *****");
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System.out.println("1. Display records");
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System.out.println("2. Insert record");
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System.out.println("3. Update record");
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System.out.println("4. Delete record");
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System.out.println("0. Exit");
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// Getting user option from above menu
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System.out.print("Your choice: ");
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option = input.nextInt();
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System.out.println();
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return option;
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} // End of showMenu
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}

‎lab-08-mysql/TemplateMenu.java

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import java.util.Scanner; // Import the Scanner class
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public class TemplateMenu {
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public static void main(String[] args) {
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Scanner input = new Scanner(System.in); // Create a Scanner object
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int option; // Initializing some variables
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while(true) {
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System.out.println("\n***** MAIN MENU *****");
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System.out.println("1. TV");
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System.out.println("2. Mobile");
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System.out.println("0. Exit");
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System.out.print("Your choice: ");
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option = input.nextInt(); // get user option from above menu
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switch (option) { // main menu
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case 1:
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System.out.println("11111...");
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break;
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case 2:
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System.out.println("2222...");
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break;
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case 0:
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System.out.println("Quitting Program...");
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System.exit(0); // program ends
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break;
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default:
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System.out.println("Please enter a valid option!");
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} // end of switch
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} // end of while
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}
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}

‎lab-08-mysql/TemplateMenu2.java

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import java.util.Scanner; // Import the Scanner class
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public class TemplateMenu2 {
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public static void main(String[] args) {
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Scanner input = new Scanner(System.in); // Create a Scanner object
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int option, isExit; // Initializing some variables
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do { // Loop for reusing the program
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option = showMenu(); // The option value
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switch (option){
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case 1:
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System.out.println("***** DISPLAY *****");
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break;
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case 2:
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System.out.println("***** INSERT RECORD *****");
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break;
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case 3:
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System.out.println("***** UPDATE RECORD *****");
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break;
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case 4:
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System.out.println("***** DELETE RECORD *****");
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break;
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case 0:
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System.out.println("Quitting Program...");
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System.exit(0); // program ends
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break;
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default:
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System.out.println("Please choose a valid option!");
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} // End of switch
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System.out.print("\nDo you want to continue? (0.No 1.Yes) - ");
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isExit = input.nextInt(); // validation checking
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} while(isExit == 1);
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} // end of main()
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public static int showMenu() {
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Scanner input = new Scanner(System.in); // Create a Scanner object
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int option = 0;
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// Printing menu to screen
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System.out.println("\n***** MAIN MENU *****");
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System.out.println("1. Display records");
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System.out.println("2. Insert record");
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System.out.println("3. Update record");
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System.out.println("4. Delete record");
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System.out.println("0. Exit");
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// Getting user option from above menu
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System.out.print("Your choice: ");
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option = input.nextInt();
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System.out.println();
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return option;
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} // End of showMenu
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}

‎lab-08-mysql/U1910049_Lab_8_JDBC.zip

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‎lab-08-mysql/mysql-shell.png

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‎lab-08-mysql/screenshot-1.png

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‎lab-08-mysql/screenshot-2.png

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