Previously on this blog, I've written a post explaining why you should use jOOQ's code generator, despite the possibility of using jOOQ without it. In a similar fashion, as I've answered numerous jOOQ questions on Stack Overflow, where someone used jOOQ to build a query, but then executed it elsewhere, including on: JPA JDBC / … Continue reading Why You Should Execute jOOQ Queries With jOOQ
Tag: stored procedures
Calling Procedures with Default Parameters using JDBC or jOOQ
Using jOOQ's code generator to call stored procedures is a popular reason to use jOOQ. For example, when you have a procedure like the following Oracle PL/SQL procedure: CREATE OR REPLACE PROCEDURE p ( p_i1 IN number, p_o1 OUT number, p_i2 IN varchar2, p_o2 OUT varchar2 ) IS BEGIN p_o1 := p_i1; p_o2 := p_i2; … Continue reading Calling Procedures with Default Parameters using JDBC or jOOQ
How to Integration Test Stored Procedures with jOOQ
When you write stored procedures and functions in your database, you want to ensure their correctness, just like with your Java code. In Java, this is done with unit tests, typically with JUnit. For example, if you have the following code in Java: public static int add(int a, int b) { return a + b; … Continue reading How to Integration Test Stored Procedures with jOOQ
The Best Way to Call Stored Procedures from Java: With jOOQ
jOOQ is mainly known for its powerful type safe, embedded, dynamic SQL capabilities that are made available through code generation. However, a secondary use case of code generation is to use it for stored procedures (possibly exclusively for stored procedures). Stored procedures are powerful ways of moving complex data processing logic to the server. This … Continue reading The Best Way to Call Stored Procedures from Java: With jOOQ
Why You Should Use jOOQ With Code Generation
I'm answering many jOOQ questions on Stack Overflow, and a lot of times. The problem has the same cause: People not using jOOQ's code generator. The main reason people seem not to be using it, is because it takes some extra time to set up, but as with anything well designed, the initial investment will … Continue reading Why You Should Use jOOQ With Code Generation
Vendor Agnostic, Dynamic Procedural Logic with jOOQ
One of the strengths of modern RDBMS is the capability to mix the powerful SQL language with procedural code. SQL is a 4th generation programming language (4GL), and as such, extremely well suited for querying and bulk data manipulation. Its functional-declarative nature allows for it to be optimised in highly efficient ways using cost-based optimisation, … Continue reading Vendor Agnostic, Dynamic Procedural Logic with jOOQ
MySQL’s allowMultiQueries flag with JDBC and jOOQ
MySQL's JDBC connector has a security feature called allowMultiQueries, which defaults to false. When turned off, it prevents using a useful, but potentially dangerous feature in MySQL via JDBC: try (Statement s = connection.createStatement()) { try { s.execute("create table t (i int);"); // This doesn't work, by default: s.executeUpdate(""" insert into t values (1); insert … Continue reading MySQL’s allowMultiQueries flag with JDBC and jOOQ
Translating Stored Procedures Between Dialects
In the past years, we've invested a lot of effort into improving our procedural language capabilities in jOOQ. What started with a simple internal API to support the emulations of DDL clauses like these: -- Some dialect that supports this create table if not exists t (i varchar(10)); -- Db2 begin declare continue handler for … Continue reading Translating Stored Procedures Between Dialects
jOOQ Internals: Pushing up SQL fragments
Over the past 13 years, jOOQ has accrued quite some internal features, which you, the user, are not exposed to. One very interesting feature is the capability for any arbitrary jOOQ expression tree element to push a SQL fragment up to a higher level. How does it work? The jOOQ expression tree model When you … Continue reading jOOQ Internals: Pushing up SQL fragments
The Cost of JDBC Server Roundtrips
Or: Move That Loop into the Server Already! This article will illustrate the significance of something that I always thought to be common sense, but I keep seeing people getting this (very) wrong in their productive systems. Chances are, in fact, that most applications out there suffer from this performance problem - and the fix … Continue reading The Cost of JDBC Server Roundtrips