In this tutorial, we will learn how to use JDBC PreparedStatement to insert, select, update and delete records with MySQL database.

What is Prepared Statement

A Prepared Statement is simply a precompiled SQL statement.

Prepared Statements provide the following benefits:

They make it easier to set SQL parameters.
They prevent SQL dependency injection attacks, and they also may improve the application.
It provides better performance since the SQL statement is precompiled.

Key points

From JDBC 4.0, we don't need to include 'Class.forName()' in our code to load JDBC driver. JDBC 4.0 drivers that are found in your classpath are automatically loaded.
We use try-with-resources statements to automatically close JDBC resources

Technologies used

JDK - 1.8 or later
MySQL - 8+
IDE - Eclipse Neon
JDBC API - 4.2

Prep work

You need to have MySQL database installed - https://dev.mysql.com/downloads/installer/
Download MySQL JDBC Driver - https://mvnrepository.com/artifact/mysql/mysql-connector-java/8.0.18
Use the following SQL statement to create a Database in MySQL Workbench:

create database jdbc_demo;

Create a users table using the following DDL Script:

CREATE TABLE `users` (
  `id` int(3) NOT NULL,
  `name` varchar(20) DEFAULT NULL,
  `email` varchar(20) DEFAULT NULL,
  `country` varchar(20) DEFAULT NULL,
  `password` varchar(20) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

JDBC PreparedStatement - Insert a Record Example

In this example, we will use the users database table that is created in the above section.

PreparedStatement interface provides the executeUpdate() method - executes the SQL statement in this PreparedStatement object, which must be an SQL Data Manipulation Language (DML) statement, such as INSERT, UPDATE or DELETE; or an SQL statement that returns nothing, such as a DDL statement.

package com.javaguides.jdbc.preparestatement.examples;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

/**
 * Insert PrepareStatement JDBC Example
 * 
 * @author Ramesh Fadatare
 *
 */
public class InsertPStatementExample {
    private static final String INSERT_USERS_SQL = "INSERT INTO users" +
        "  (id, name, email, country, password) VALUES " +
        " (?, ?, ?, ?, ?);";

    public static void main(String[] argv) throws SQLException {
        InsertPStatementExample createTableExample = new InsertPStatementExample();
        createTableExample.insertRecord();
    }

    public void insertRecord() throws SQLException {
        System.out.println(INSERT_USERS_SQL);
        // Step 1: Establishing a Connection
        try (Connection connection = DriverManager
            .getConnection("jdbc:mysql://localhost:3306/mysql_database?useSSL=false", "root", "root");

            // Step 2:Create a statement using connection object
            PreparedStatement preparedStatement = connection.prepareStatement(INSERT_USERS_SQL)) {
            preparedStatement.setInt(1, 1);
            preparedStatement.setString(2, "Tony");
            preparedStatement.setString(3, "tony@gmail.com");
            preparedStatement.setString(4, "US");
            preparedStatement.setString(5, "secret");

            System.out.println(preparedStatement);
            // Step 3: Execute the query or update query
            preparedStatement.executeUpdate();
        } catch (SQLException e) {

            // print SQL exception information
            printSQLException(e);
        }

        // Step 4: try-with-resource statement will auto close the connection.
    }

    public static void printSQLException(SQLException ex) {
        for (Throwable e: ex) {
            if (e instanceof SQLException) {
                e.printStackTrace(System.err);
                System.err.println("SQLState: " + ((SQLException) e).getSQLState());
                System.err.println("Error Code: " + ((SQLException) e).getErrorCode());
                System.err.println("Message: " + e.getMessage());
                Throwable t = ex.getCause();
                while (t != null) {
                    System.out.println("Cause: " + t);
                    t = t.getCause();
                }
            }
        }
    }
}

Output

JDBC PreparedStatement - Update a Record Example

In the previous example, we have inserted a record into the users table and now we will update the same record with below Java program:

package com.javaguides.jdbc.preparestatement.examples;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

/**
 * Update PreparedStatement JDBC Example
 * @author Ramesh Fadatare
 *
 */
public class UpdatePStatementExample {

    private static final String UPDATE_USERS_SQL = "update users set name = ? where id = ?;";

    public static void main(String[] argv) throws SQLException {
        UpdatePStatementExample updateStatementExample = new UpdatePStatementExample();
        updateStatementExample.updateRecord();
    }

    public void updateRecord() throws SQLException {
        System.out.println(UPDATE_USERS_SQL);
        // Step 1: Establishing a Connection
        try (Connection connection = DriverManager
            .getConnection("jdbc:mysql://localhost:3306/mysql_database?useSSL=false", "root", "root");

            // Step 2:Create a statement using connection object
            PreparedStatement preparedStatement = connection.prepareStatement(UPDATE_USERS_SQL)) {
            preparedStatement.setString(1, "Ram");
            preparedStatement.setInt(2, 1);

            // Step 3: Execute the query or update query
            preparedStatement.executeUpdate();
        } catch (SQLException e) {

            // print SQL exception information
            printSQLException(e);
        }

        // Step 4: try-with-resource statement will auto close the connection.
    }

    public static void printSQLException(SQLException ex) {
        for (Throwable e: ex) {
            if (e instanceof SQLException) {
                e.printStackTrace(System.err);
                System.err.println("SQLState: " + ((SQLException) e).getSQLState());
                System.err.println("Error Code: " + ((SQLException) e).getErrorCode());
                System.err.println("Message: " + e.getMessage());
                Throwable t = ex.getCause();
                while (t != null) {
                    System.out.println("Cause: " + t);
                    t = t.getCause();
                }
            }
        }
    }
}

Output

JDBC PreparedStatement - Select a Record Example

In the previous example, we have inserted or updated a record into the users table and now we will query a list of users from the database table by id.

package com.javaguides.jdbc.preparestatement.examples;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

/**
 * Select PreparedStatement JDBC Example
 * 
 * @author Ramesh Fadatare
 *
 */
public class SelectPStatementExample {
    private static final String QUERY = "select id,name,email,country,password from Users where id =?";

    public static void main(String[] args) {

        // using try-with-resources to avoid closing resources (boiler plate code)

        // Step 1: Establishing a Connection
        try (Connection connection = DriverManager
            .getConnection("jdbc:mysql://localhost:3306/jdbc_demo?useSSL=false", "root", "root");

            // Step 2:Create a statement using connection object
            PreparedStatement preparedStatement = connection.prepareStatement(QUERY);) {
            preparedStatement.setInt(1, 1);
            System.out.println(preparedStatement);
            // Step 3: Execute the query or update query
            ResultSet rs = preparedStatement.executeQuery();

            // Step 4: Process the ResultSet object.
            while (rs.next()) {
                int id = rs.getInt("id");
                String name = rs.getString("name");
                String email = rs.getString("email");
                String country = rs.getString("country");
                String password = rs.getString("password");
                System.out.println(id + "," + name + "," + email + "," + country + "," + password);
            }
        } catch (SQLException e) {
            printSQLException(e);
        }
        // Step 4: try-with-resource statement will auto close the connection.
    }

    public static void printSQLException(SQLException ex) {
        for (Throwable e: ex) {
            if (e instanceof SQLException) {
                e.printStackTrace(System.err);
                System.err.println("SQLState: " + ((SQLException) e).getSQLState());
                System.err.println("Error Code: " + ((SQLException) e).getErrorCode());
                System.err.println("Message: " + e.getMessage());
                Throwable t = ex.getCause();
                while (t != null) {
                    System.out.println("Cause: " + t);
                    t = t.getCause();
                }
            }
        }
    }
}

Output:

1,Ram,tony@gmail.com,US,secret

JDBC PreparedStatement - Delete a Record Example

Let's write a Java program to delete a record from MySQL database using Java JDBC:

package com.javaguides.jdbc.preparestatement.examples;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

/**
 * Delete Statement JDBC Example
 * 
 * @author Ramesh Fadatare
 *
 */
public class DeletePreparedStatementExample {

    private static final String DELETE_USERS_SQL = "delete from users where id = ?;";

    public static void main(String[] argv) throws SQLException {
        DeletePreparedStatementExample deleteStatementExample = new DeletePreparedStatementExample();
        deleteStatementExample.deleteRecord();
    }

    public void deleteRecord() throws SQLException {
        System.out.println(DELETE_USERS_SQL);

        // no need to register driver manually

        // Step 1: Establishing a Connection
        try (Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/jdbc_demo?useSSL=false",
                "root", "root");

            // Step 2:Create a statement using connection object
            PreparedStatement statement = connection.prepareStatement(DELETE_USERS_SQL);) {
            statement.setInt(1, 1);
            // Step 3: Execute the query or update query
            int result = statement.executeUpdate();
            System.out.println("Number of records affected :: " + result);
        } catch (SQLException e) {

            // print SQL exception information
            printSQLException(e);
        }

        // Step 4: try-with-resource statement will auto close the connection.
    }

    public static void printSQLException(SQLException ex) {
        for (Throwable e: ex) {
            if (e instanceof SQLException) {
                // e.printStackTrace(System.err);
                System.err.println("SQLState: " + ((SQLException) e).getSQLState());
                System.err.println("Error Code: " + ((SQLException) e).getErrorCode());
                System.err.println("Message: " + e.getMessage());
                Throwable t = ex.getCause();
                while (t != null) {
                    System.out.println("Cause: " + t);
                    t = t.getCause();
                }
            }
        }
    }
}

Output:

delete from users where id = ?;
Number of records affected :: 1

Conclusion

In this tutorial, we have seen how to use JDBC PreparedStatement to insert, select, update and delete records with MySQL database.

Learn more about JDBC at https://www.javaguides.net/p/jdbc-tutorial.html

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JDBC PreparedStatement Tutorial - Select, Insert, Update and Delete Example

What is Prepared Statement

Key points

Technologies used

Prep work

JDBC PreparedStatement - Insert a Record Example

Output

JDBC PreparedStatement - Update a Record Example

Output

JDBC PreparedStatement - Select a Record Example

JDBC PreparedStatement - Delete a Record Example

Conclusion

Comments

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Big Sale!!!!!

Big Black Friday sale is going on my all Udemy courses.
You can get each course just at 389/- (85% OFF)

JDBC PreparedStatement Tutorial - Select, Insert, Update and Delete Example

What is Prepared Statement

Key points

Technologies used

Prep work

JDBC PreparedStatement - Insert a Record Example

Output

JDBC PreparedStatement - Update a Record Example

Output

JDBC PreparedStatement - Select a Record Example

JDBC PreparedStatement - Delete a Record Example

Conclusion

Comments

Post a Comment

Big Sale!!!!!

Big Black Friday sale is going on my all Udemy courses. You can get each course just at 389/- (85% OFF)

Big Black Friday sale is going on my all Udemy courses.
You can get each course just at 389/- (85% OFF)