java - Insert into multiple rows in mysql (or JPA)

Java - Insert into multiple rows in mysql (or JPA)

To insert multiple rows into a MySQL database using Java, you can use JDBC (Java Database Connectivity) directly or utilize an ORM (Object-Relational Mapping) framework like JPA (Java Persistence API) if your project is already using it. Here, We'll provide examples for both approaches.

Using JDBC:

import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.SQLException; public class MultipleInsert { public static void main(String[] args) { String url = "jdbc:mysql://localhost:3306/your_database"; String user = "username"; String password = "password"; String insertQuery = "INSERT INTO your_table (column1, column2) VALUES (?, ?)"; try (Connection connection = DriverManager.getConnection(url, user, password); PreparedStatement statement = connection.prepareStatement(insertQuery)) { // Inserting multiple rows for (int i = 0; i < 10; i++) { statement.setString(1, "value1_" + i); statement.setString(2, "value2_" + i); statement.addBatch(); } // Execute the batch insert statement.executeBatch(); System.out.println("Rows inserted successfully."); } catch (SQLException e) { e.printStackTrace(); } } }

Using JPA:

If you're using JPA, you can create and persist entities in a loop:

import javax.persistence.EntityManager; import javax.persistence.EntityManagerFactory; import javax.persistence.EntityTransaction; import javax.persistence.Persistence; public class MultipleInsert { public static void main(String[] args) { EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory("YourPersistenceUnitName"); EntityManager entityManager = entityManagerFactory.createEntityManager(); EntityTransaction transaction = entityManager.getTransaction(); transaction.begin(); // Inserting multiple rows for (int i = 0; i < 10; i++) { YourEntity entity = new YourEntity(); entity.setColumn1("value1_" + i); entity.setColumn2("value2_" + i); entityManager.persist(entity); } transaction.commit(); entityManager.close(); entityManagerFactory.close(); System.out.println("Rows inserted successfully."); } }

Replace your_database, username, password, your_table, column1, and column2 with your actual database details. In the JPA example, replace "YourPersistenceUnitName" with the name of your persistence unit defined in persistence.xml, and YourEntity with your actual entity class.

Examples

  1. Java JPA batch insert example

    • Description: Demonstrates how to perform batch inserts using Java Persistence API (JPA).
    EntityManager entityManager = entityManagerFactory.createEntityManager(); entityManager.getTransaction().begin(); List<Entity> entities = new ArrayList<>(); for (int i = 0; i < 1000; i++) { Entity entity = new Entity(); // set entity properties entities.add(entity); entityManager.persist(entity); if (i % 50 == 0) { // flush in batches of 50 entityManager.flush(); entityManager.clear(); } } entityManager.getTransaction().commit(); entityManager.close();

  2. Java JPA bulk insert multiple rows

    • Description: Shows how to efficiently insert multiple rows using JPA in Java.
    EntityManager entityManager = entityManagerFactory.createEntityManager(); entityManager.getTransaction().begin(); List<Entity> entities = new ArrayList<>(); for (int i = 0; i < 1000; i++) { Entity entity = new Entity(); // set entity properties entities.add(entity); } for (int i = 0; i < entities.size(); i += 50) { List<Entity> sublist = entities.subList(i, Math.min(i + 50, entities.size())); sublist.forEach(entityManager::persist); entityManager.flush(); entityManager.clear(); } entityManager.getTransaction().commit(); entityManager.close();

  3. Java JPA batch insert performance

    • Description: Analyzes the performance of batch inserts using JPA in Java.
    EntityManager entityManager = entityManagerFactory.createEntityManager(); entityManager.getTransaction().begin(); for (int i = 0; i < 1000; i++) { Entity entity = new Entity(); // set entity properties entityManager.persist(entity); if (i % 50 == 0) { // flush in batches of 50 entityManager.flush(); entityManager.clear(); } } entityManager.getTransaction().commit(); entityManager.close();

  4. Java JPA bulk insert vs individual insert

    • Description: Compares the performance between bulk insert and individual insert using JPA in Java.
    // Bulk insert entityManager.getTransaction().begin(); for (int i = 0; i < 1000; i++) { Entity entity = new Entity(); // set entity properties entityManager.persist(entity); } entityManager.getTransaction().commit(); // Individual insert entityManager.getTransaction().begin(); for (int i = 0; i < 1000; i++) { Entity entity = new Entity(); // set entity properties entityManager.persist(entity); entityManager.flush(); } entityManager.getTransaction().commit();

  5. Java JPA batch insert Hibernate

    • Description: Shows how to perform batch inserts using Hibernate with JPA in Java.
    Session session = entityManager.unwrap(Session.class); session.beginTransaction(); for (int i = 0; i < 1000; i++) { Entity entity = new Entity(); // set entity properties session.persist(entity); if (i % 50 == 0) { // flush in batches of 50 session.flush(); session.clear(); } } session.getTransaction().commit();

  6. Java JPA batch insert native query

    • Description: Executes batch insert using native SQL queries with JPA in Java.
    EntityManager entityManager = entityManagerFactory.createEntityManager(); entityManager.getTransaction().begin(); for (int i = 0; i < 1000; i++) { entityManager.createNativeQuery("INSERT INTO table_name (column1, column2) VALUES (?, ?)") .setParameter(1, value1) .setParameter(2, value2) .executeUpdate(); if (i % 50 == 0) { // flush in batches of 50 entityManager.flush(); entityManager.clear(); } } entityManager.getTransaction().commit(); entityManager.close();

  7. Java JPA batch insert Oracle

    • Description: Demonstrates batch insert using JPA with Oracle database in Java.
    EntityManager entityManager = entityManagerFactory.createEntityManager(); entityManager.getTransaction().begin(); Session session = entityManager.unwrap(Session.class); for (int i = 0; i < 1000; i++) { Entity entity = new Entity(); // set entity properties session.persist(entity); if (i % 50 == 0) { // flush in batches of 50 session.flush(); session.clear(); } } entityManager.getTransaction().commit(); entityManager.close();

  8. Java JPA batch insert PostgreSQL

    • Description: Illustrates batch insert using JPA with PostgreSQL in Java.
    EntityManager entityManager = entityManagerFactory.createEntityManager(); entityManager.getTransaction().begin(); Session session = entityManager.unwrap(Session.class); for (int i = 0; i < 1000; i++) { Entity entity = new Entity(); // set entity properties session.persist(entity); if (i % 50 == 0) { // flush in batches of 50 session.flush(); session.clear(); } } entityManager.getTransaction().commit(); entityManager.close();

  9. Java JPA bulk insert performance tuning

    • Description: Discusses techniques for tuning the performance of bulk inserts using JPA in Java.
    EntityManager entityManager = entityManagerFactory.createEntityManager(); entityManager.getTransaction().begin(); for (int i = 0; i < 1000; i++) { Entity entity = new Entity(); // set entity properties entityManager.persist(entity); if (i % 50 == 0) { // flush in batches of 50 entityManager.flush(); entityManager.clear(); } } entityManager.getTransaction().commit(); entityManager.close();

  10. Java JPA batch insert MySQL

    • Description: Presents batch insert using JPA with MySQL database in Java.
    EntityManager entityManager = entityManagerFactory.createEntityManager(); entityManager.getTransaction().begin(); for (int i = 0; i < 1000; i++) { Entity entity = new Entity(); // set entity properties entityManager.persist(entity); if (i % 50 == 0) { // flush in batches of 50 entityManager.flush(); entityManager.clear(); } } entityManager.getTransaction().commit(); entityManager.close();

More Tags

lidar mamp mongo-java-driver glsl pymssql data-analysis urxvt angular-http interpolation virtual-memory

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