jOOQ | jOOQ is the best way to write SQL in Java | SQL Database library
kandi X-RAY | jOOQ Summary
kandi X-RAY | jOOQ Summary
Other platforms incorporate ideas such as LINQ (with LINQ-to-SQL), or Scala’s SLICK, or also Java’s QueryDSL to better integrate querying as a concept into their respective language. By querying, they understand querying of arbitrary targets, such as SQL, XML, Collections and other heterogeneous data stores. jOOQ claims that this is going the wrong way too. In more advanced querying use-cases (more than simple CRUD and the occasional JOIN), people will want to profit from the expressivity of SQL. Due to the relational nature of SQL, this is quite different from what object-oriented and partially functional languages such as C#, Scala, or Java can offer. It is very hard to formally express and validate joins and the ad-hoc table expression types they create. It gets even harder when you want support for more advanced table expressions, such as pivot tables, unnested cursors, or just arbitrary projections from derived tables. With a very strong object-oriented typing model, these features will probably stay out of scope. In essence, the decision of creating an API that looks like SQL or one that looks like C#, Scala, Java is a definite decision in favour of one or the other platform. While it will be easier to evolve SLICK in similar ways as LINQ (or QueryDSL in the Java world), SQL feature scope that clearly communicates its underlying intent will be very hard to add, later on (e.g. how would you model Oracle’s partitioned outer join syntax? How would you model ANSI/ISO SQL:1999 grouping sets? How can you support scalar subquery caching? etc…). jOOQ has come to fill this gap.
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Top functions reviewed by kandi - BETA
- Overrides the visitor to create a SourceVisitor
- Checks if the given method invocation is allowed
- Prints out the error
- Reports an error
- Sets the JOOQ code generator
- Reads the configuration from a file
- Returns the class loader
- Overrides the visitor to return a SourceVisitor for a method invocation
- Matches a method invocation
jOOQ Key Features
jOOQ Examples and Code Snippets
Lines of Code : 13License : Permissive (MIT License)
Copypublic void convertUsingCustomisedJOOQ() throws ClassNotFoundException, SQLException {
Class.forName("org.h2.Driver");
Connection dbConnection = DriverManager.getConnection("jdbc:h2:mem:rs2jdbc", "user", "password");
// Create
org.codehaus.gmaven
groovy-maven-plugin
2.1.1
generate-sources
execute
// Here ATableRecord and CTableRecord are autogenerated by JOOQ based on the table definitions
record ACContainerRecord (ATableRecord a, CTableRecord c);
select(
A_TABLE.fieldsRow().as("a").convertFrom(r -> r.into(ATableRecord.writeContext.transaction(writeTransaction -> {
// Try here!
try {
...
Map returnMap = writeFn(dataToWrite, writeTransaction);
secondWriteFn(moreDataToWrite, returnMap, writeTransaction);
throw n
org.springframework.boot
spring-boot-starter-jooq
org.jooq
jooq
-- [jooq ignore start]
-- Anything between these two tokens is ignored by the jOOQ parser
CREATE TRIGGER ...
-- [jooq ignore stop]
jooq {
version = dependencyManagement.importedProperties['jooq.version']
}
create.transaction(c1 -> {
try {
c1.dsl().transaction(c2 -> {
c2.dsl().update(...);
Object obj = c2.dsl().select(...);
if (obj == null)
throw new MyRollbackException();
Failed to bind properties under 'spring.jooq.sql-dialect' to org.jooq.SQLDialect:
Property: spring.jooq.sql-dialect
Value: MYSQL_5_7
Origin: class path resource [application.properties]:2:25
Reason: failed to convert java.BillingAmount sum = jooq
.select(sum(TABLE.BILLING_AMOUNT.coerce(BigDecimal.class)))
.from(TABLE)
.fetchSingle(TABLE.BILLING_AMOUNT);
Community Discussions
Trending Discussions on jOOQ
QUESTION
I use my liqibase scripts for Jooq code generation. As I learned from the instructions and log, the Dialect is H2.
Is that a problem if the application runs against a SQL Server database afterwards? Does the code generation have to be adjusted or do the metaclasses remain the same?
...ANSWER
Answered 2022-Apr-07 at 14:38The LiquibaseDatabase can be used for simple database schemas where it is desirable not to connect to an actual database instance (e.g. for performance reasons) in order to generate code. It's drawbacks are that it's not an actual SQL Server database, but a simulated migration - currently on an in-memory H2 database. This means that some vendor specific functionality may not work as expected.
It is usually better not to use the above utility for more complex schemas with vendor specific features (e.g. stored procedures, etc.). Instead, use the SQLServerDatabase that connects to an actual database instance.
You could still use Liquibase on a testcontainers based SQL Server instance to set up your schema prior to generating jOOQ code, as explained in this blog post here.
QUESTION
I'm using delete and update methods that uses 'where' function of jOOQ:
...ANSWER
Answered 2022-Mar-22 at 09:09The error isn't related to your specific query, but to your dependency management.
The java.util.concurrent.Flow class has been added to the JDK 9 only, it was not yet available in the JDK 8. Starting from jOOQ 3.15, the jOOQ Open Source Edition had a Java 11 baseline and thus a direct dependency on JDK 11 API, including Flow. If you wish to continue working with Java 8 and jOOQ 3.15, you will need to upgrade to the commercial distributions, which have continued support for Java 8. You can find jOOQ's Java version support matrix here:
https://www.jooq.org/download/versions
A common reason why you might still be accidentally pulling the jOOQ Open Source Edition dependency and thus run into this error, despite using the commercial editions, could be related to using a third party dependency management framework, such as Spring Boot, which defaults to depending on the jOOQ Open Source Edition. This blog post explains how to work around that: https://blog.jooq.org/how-to-use-jooqs-commercial-distributions-with-spring-boot/
Also, make sure you're using the right dependencies both in your code generation setup as well as at runtime, as you can see in this section of the manual.
It says:
QUESTION
I want jOOQ auto-code generator to run on basis of liquibase schema xml file located in resources folder (not on basis of database connection). The configuration part looks like this in pom.xml:
...ANSWER
Answered 2022-Mar-21 at 12:45This is most likely due to a bug: https://github.com/jOOQ/jOOQ/issues/12997
Explanation and workaroundBehind the scenes, in jOOQ 3.16, the LiquibaseDatabase, DDLDatabase, and JPADatabase all simulate your database migrations using an in-memory H2 database. This might be changed in the future, but that's how it works now. In H2, by default, all identifiers are in upper case, and so is the configuration. This means you should be including the PUBLIC schema, not the public schema.
Note that also code generation output will contain references to PUBLIC, not public, so if you want to continue using the LiquibaseDatabase, you'll have to turn off quoting of identifiers at runtime using the RenderQuotedNames setting.
Alternatively, you don't have to use the LiquibaseDatabase, as I've mentioned elsewhere. You can also use testcontainers to run an actual migration directly on PostgreSQL, and reverse engineer an actual PostgreSQL database, instead, as described in this blog post.
QUESTION
I have a trouble: can't figure out how to map result of Jooq query.
I have 2 entities: Payment method and Currency for it. Payment method contains a List inside. Both are stored in different tables.
I get one:
...ANSWER
Answered 2022-Mar-11 at 07:23If you want to nest collections in with jOOQ, then you're probably looking for the MULTISET or MULTISET_AGG operator along with ad-hoc conversion, which allows for type safe nesting collections directly in SQL, if your database product support SQL/XML or SQL/JSON.
The following might not be the exact query you were looking for, but you get the idea:
QUESTION
In Oracle, the following query:
...ANSWER
Answered 2022-Feb-25 at 16:23In my opinion, it's a bug in ojdbc. Workarounds include:
Cast the bind variableQUESTION
Recently i have switched to Java stack on new position and i got some troubles with Jooq which is used to access db
My question is: will ForUpdate in the code below block only one row that satisfies another_condition and will be selected or multiple rows that satisfy some_condition
...ANSWER
Answered 2022-Feb-22 at 08:58ResultSet reading
The ResultQuery.fetchAny() method only defines client side behaviour between jOOQ and JDBC. It proceeds to fetch at most one record from the underlying JDBC ResultSet. In short:
ResultQuery.fetchAny()fetches the first record (if available) from theResultSetResultQuery.fetchOne()fetches the first record (if available) from theResultSetand attempts to fetch another one, in case of which it throwsTooManyRowsExceptionResultQuery.fetchSingle()fetches the first record from theResultSet, throwsNoDataFoundExceptionif no such record was found, and attempts to fetch another one, in case of which it throwsTooManyRowsException
These methods do not communicate to the server anything about the intended result set usage, so the server doesn't know what you're planning to do.
Server side lockingThis is unrelated to how you use SQL pessimistic locking clauses, such as FOR UPDATE SKIP LOCKED, which is an operation that happens purely on the server side, and ideally on the entire data set satisfying your WHERE, LIMIT, and other clauses. Even if this weren't the case, it's always better to be very explicit about everything you know about your SQL query directly in SQL.
So, since you're going to fetch only one record, why not tell the server, using LIMIT 1?
QUESTION
I am working on a Spring Boot application where I am using JOOQ version 3.15.5 to communicate with the DB. Now I am trying to insert multiple rows in DB and to get the IDs as the result set. How can I do this? I tried to use valuesOfRecords to insert a collection of records but I couldn't make it work, because it forces me to put all the fields of MY_TABLE, including the unknown ID. I tried:
ANSWER
Answered 2022-Jan-05 at 12:32You don't have to include the ID column. Why not just write this instead?
QUESTION
[
{
"permissions": [
{
"name": "CREATE",
"id": 1
},
{
"name": "DELETE",
"id": 4
}
],
"roles": [
{
"name": "ADMIN",
"permission": [
{
"name": "CREATE",
"id": 1
},
{
"name": "UPDATE",
"id": 2
},
{
"name": "GET",
"id": 3
},
{
"name": "DELETE",
"id": 4
}
],
"id": 1
},
{
"name": "ADMIN",
"permission": [
{
"name": "CREATE",
"id": 1
},
{
"name": "UPDATE",
"id": 2
},
{
"name": "GET",
"id": 3
},
{
"name": "DELETE",
"id": 4
}
],
"id": 1
}
],
"id": 1,
"username": "raj@100"
},
{
"permissions": [
{
"name": null,
"id": null
}
],
"roles": [
{
"name": "USER",
"permission": [
{
"name": "GET",
"id": 3
}
],
"id": 3
}
],
"id": 2,
"username": "ram145"
}
]
ANSWER
Answered 2022-Jan-04 at 09:28Your join graph creates a cartesian product between the two "nested collections" ROLE and PERMISSION. You can't remove that cartesian product with GROUP BY alone, that works only if you join a single to-many relationship.
Instead, you can write subqueries like this (you already did this correctly for the ROLE_PERMISSION relationship):
QUESTION
select question.*,
question_option.id
from question
left join question_option on question_option.question_id = question.id;
ANSWER
Answered 2021-Dec-21 at 08:48I assume that you generate the metamodel so you can use
QUESTION
I'm facing problem with ordering database records. I'm using jOOQ and DSLContext in SpringBoot application to select data from configured Oracle database. Everything works fine locally on my Windows device. After deploying application to Openshift container platform, the same select orders records differently. Database contains text values in Slovak language with accents and special characters as you can see in result tables.
Select:
...ANSWER
Answered 2021-Dec-20 at 16:17The jOOQ API supports collations, which is the SQL way of specifying the sort order for different character sets and locales. You could write:
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install jOOQ
You can use jOOQ like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the jOOQ component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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