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How to use CRUD in Java programming | 100% best for beginners

November 2, 2020 - Updated on October 29, 2021
in Java
Reading Time: 3 mins read
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Contents

  • How to use CRUD in Java
  • INSERT Statement example
  • SELECT Statement example
  • UPDATE Statement example
  • DELETE Statement example
  • YouTube Video

How to use CRUD in Java

Create, Read, Update, and Delete (CRUD). Most applications have some kind of CRUD functionality. Maybe, most of the beginners are confused about CRUD in java. Well, Insert, Select, Update, and Delete are the SQL statements. These are examples of CRUD.

INSERT Statement example

import java.sql.*;

public class CRUD {

public Connection connection;
public Statement statement;
public String sql = "";

public static void main(String args[]) {
try {
Class.forName("com.mysql.jdbc.Driver");
connection = DriverManager.getConnection("Database url","root","root");
statement = connection.createStatement();
sql = "INSERT INTO tableName(name,age,nickname) values('"+name.getText()+"','"+age.getText()+"','"+nickname.getText()+"')";
statement.executeUpdate(sql);
System.out.println("Success");
} catch (Exception e) {
System.out.println(e);
}
}
}

SELECT Statement example

import java.sql.*;

public class CRUD {

public Connection connection;
public Statement statement;
public ResultSet resultset;
public String sql = "";

public static void main(String args[]) {
try {
Class.forName("com.mysql.jdbc.Driver");
connection = DriverManager.getConnection("Database url","root","root");
statement = connection.createStatement();
sql = "Select * from tablename";
resultset = statement.executeQuery(sql);
if(resultset.next()){
String name = resultset.getString("name");
String age = resultset.getString("age");
String nickname = resultset.getString("nickname");
System.out.println(name+" "+age+" "+nickname);
}
} catch (Exception e) {
System.out.println(e);
}
}
}

UPDATE Statement example

import java.sql.*;

public class CRUD {

public Connection connection;
public Statement statement;
public ResultSet resultset;
public String sql = "";

public static void main(String args[]) {
try {
Class.forName("com.mysql.jdbc.Driver");
connection = DriverManager.getConnection("Database url","root","root");
statement = connection.createStatement();
sql = "UPDATE tablename set age = '21' where name = 'Kensoft'";
statement.executeUpdate(sql);
System.out.println("Success");
} catch (Exception e) {
System.out.println(e);
}
}
}

DELETE Statement example

import java.sql.*;

public class CRUD {

public Connection connection;
public Statement statement;
public ResultSet resultset;
public String sql = "";

public static void main(String args[]) {
try {
Class.forName("com.mysql.jdbc.Driver");
connection = DriverManager.getConnection("Database url","root","root");
statement = connection.createStatement();
sql = "DELETE tablename where name = 'Kensoft'";
statement.executeUpdate(sql);
System.out.println("Success");
} catch (Exception e) {
System.out.println(e);
}
}
}

That’s how you do it.

 

CRUD in java

YouTube Video

Java Tutorial: How to insert data in mysql using java netbeans
Watch this video on YouTube.
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What’s up! Kent is my name. The name KENSOFT is derived from the words Kent and Software. My programming language of choice is Java

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