Blog - Vlad Mihalcea

Posted on March 27, 2020 by vladmihalcea

Java and Database Newsletter, Issue 6

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Introduction

Welcome to a new issue of the Java and Database newsletter in which we share articles, announcements, and StackOverflow answers that are very relevant to any developer who interacts with a database system from Java.

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Posted on March 24, 2020 by vladmihalcea

The best way to use the JPA SqlResultSetMapping

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Introduction

In this article, I’m going to explain how to use the JPA SqlResultSetMapping, as well as the EntityResult, ConstructorResult, and ColumnResult options.

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Posted on March 17, 2020 by vladmihalcea

N+1 query problem with JPA and Hibernate

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Introduction

In this article, I’m going to explain what the N+1 query problem is when using JPA and Hibernate and what’s the best way to fix it.

The N+1 query problem is not specific to JPA and Hibernate, as you can face this issue even if you are using other data access technologies.

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Posted on March 13, 2020 by vladmihalcea

Java and Database Newsletter, Issue 5

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Introduction

Welcome to a new issue of the Java and Database newsletter in which we share articles, announcements, and StackOverflow answers that are very relevant to any developer who interacts with a database system from Java.

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Posted on March 10, 2020 by vladmihalcea

A beginner’s guide to JPA persistence.xml file

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Introduction

In this article, I’m going to explain what is the purpose of the JPA persistence.xml configuration file, and how you can set up a Java Persistence application using the available XML tags or attributes.

While Spring applications can bootstrap without needing an XML JPA configuration file, it’s still important to understand the meaning of each configuration option since Spring also offers an alternative way when building a Java Persistence LocalContainerEntityManagerFactoryBean or the Hibernate-specific LocalSessionFactoryBean.

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Posted on March 3, 2020 by vladmihalcea

Multiline String literals with Java Text Blocks

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Introduction

In this article, show you how the new Java Text Blocks can help you increase the readability of JPQL, SQL queries, or JSON string values.

Back in 2005, I was developing a .NET project and really liked the C# Verbatim String Literal feature since it allows you to write a multiline string value without having to concatenate each individual line.

The Java 13 Text Blocks feature now offers the possibility of creating a multiline Java String values.

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Posted on February 28, 2020 by vladmihalcea

Java and Database Newsletter, Issue 4

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Introduction

Welcome to a new issue of the Java and Database newsletter in which we share articles, announcements, and StackOverflow answers that are very relevant to any developer who interacts with a database system from Java.

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Posted on February 25, 2020 by vladmihalcea

Hibernate slow query log

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Introduction

In this article, I’m going to show you how you can activate the slow query log when using JPA and Hibernate.

This slow query log feature has been available since Hibernate ORM 5.4.5 and notifies you when the execution time of a given JPQL, Criteria API or native SQL query exceeds a certain threshold value you have previously configured.

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Posted on February 18, 2020 by vladmihalcea

Hypersistence Optimizer Runtime Scanner

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Introduction

The 2.0 version of the Hypersistence Optimizer has just arrived, and it comes with a runtime scanner that is capable of analyzing your JPA and Hibernate data access operations and queries and give you tips about how you can speed up your application.

Along with the JPA and Hibernate mapping and configuration scanners, the runtime scanner makes Hypersistence Optimizer an indispensable tool for building High-Performance Java Persistence applications.

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Posted on February 14, 2020 by vladmihalcea

Java and Database Newsletter, Issue 3

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Introduction

Welcome to a new issue of the Java and Database newsletter in which we share articles, announcements, and StackOverflow answers that are very relevant to any developer who interacts with a database system from Java.

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