The Performance Difference Between SQL Row-by-row Updating, Batch Updating, and Bulk Updating

Something that has been said many times, but needs constant repeating until every developer is aware of the importance of this is the performance difference between row-by-row updating and bulk updating. If you cannot guess which one will be much faster, remember that row-by-row kinda rhymes with slow-by-slow (hint hint). Disclaimer: This article will discuss … Continue reading The Performance Difference Between SQL Row-by-row Updating, Batch Updating, and Bulk Updating

When Using Bind Variables is not Enough: Dynamic IN Lists

In a previous blog post, I wrote about why you should (almost) always default to using bind variables. There are some exceptions, which I will cover in another follow-up post, but by default, bind variables are the right choice, both from a performance and from a security perspective. In this article, I will show an … Continue reading When Using Bind Variables is not Enough: Dynamic IN Lists

Why SQL Bind Variables are Important for Performance

A common problem with dynamic SQL is parsing performance in production. What makes matters worse is that many developers do not have access to production environments, so they are unaware of the problem (even if there's nothing new about this topic). What exactly is the problem? Execution plan caches Most database vendors these days ship … Continue reading Why SQL Bind Variables are Important for Performance

Mocking JDBC Using a Set of SQL String / Result Pairs

In a previous blog post, I've shown how the programmatic MockDataProvider can be used to mock the entire JDBC API through a single functional interface: // context contains the SQL string and bind variables, etc. MockDataProvider provider = context -> { // This defines the update counts, result sets, etc. // depending on the context … Continue reading Mocking JDBC Using a Set of SQL String / Result Pairs

How to Compile a Class at Runtime with Java 8 and 9

In some cases, it's really useful to be able to compile a class at runtime using the java.compiler module. You can e.g. load a Java source file from the database, compile it on the fly, and execute its code as if it were part of your application. In the upcoming jOOR 0.9.8, this will be … Continue reading How to Compile a Class at Runtime with Java 8 and 9