SimpleFlatMapper | A java micro ORM | Object-Relational Mapping library
kandi X-RAY | SimpleFlatMapper Summary
kandi X-RAY | SimpleFlatMapper Summary
Fast and Easy mapping from database and csv to POJO. A java micro ORM, lightweight alternative to iBatis and Hibernate. Fast Csv Parser and Csv Mapper
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Top functions reviewed by kandi - BETA
- Converts an XSLT file to a file
SimpleFlatMapper Key Features
SimpleFlatMapper Examples and Code Snippets
Community Discussions
Trending Discussions on SimpleFlatMapper
QUESTION
Can jOOQ automatically add an alias prefix for all columns of a table in the select clause?
Can jOOQ also help with the 128 byte/character name length limitation of databases?
The reason for the questions are that SimpleFlatMapper is used for the mapping. SimpleFlatMapper requires the fetched database column names to map to the model.
Model example (really getter/setter are used):
...ANSWER
Answered 2021-Mar-01 at 08:04Can jOOQ automatically add an alias prefix for all columns of a table in the select clause?
There's no such feature, because the possible sets of desired auto-prefix algorithms is quite big, and jOOQ ultimately wouldn't do exactly what you want. Maybe, there's room for an SPI to help you do this, in the future. But there isn't one available yet: https://github.com/jOOQ/jOOQ/issues/11545
However, you can easily do this yourself, because every jOOQ query is just a dynamically constructed expression tree, even if you're not always using jOOQ for dynamic SQL.
You can easily write a utility and use that everywhere:
QUESTION
Giving the last example given in this SO thread.
I get this error:
...ANSWER
Answered 2020-Nov-24 at 15:54jOOQ 3.14 added support for mapping JSON to arbitrary classes via gson or Jackson out of the box. This is documented here: https://www.jooq.org/doc/latest/manual/sql-execution/fetching/converter-provider
Notice this is a per-column data type conversion feature, which is invoked by jOOQ's DefaultRecordMapper
, not a RecordMapper
feature. After more discussions, this appears to be a bug in the RecordMapper
, which doesn't provide Jackson with as much generic type information as would be possible in your case: https://github.com/jOOQ/jOOQ/issues/11008
QUESTION
We have multiple tables like :
- School one to many teacher
- teacher one to many subject
- teacher one to many classes
Entity are as follows
...ANSWER
Answered 2020-Oct-19 at 13:11That's a tricky question for a school assignment, given that this has been, historically, one of jOOQ's most missing features :)
Starting from jOOQ 3.14 and the new SQL/XML and SQL/JSON support, this will be possible relatively easily. In essence, you will be using your RDBMS's native XML or JSON support to nest collections directly in SQL. (All other approaches using joins and trying to deduplicate and shoe-horn flat result sets into nested data structures will not work well enough, as you've noticed)
You can write a query like this (assuming you use the code generator, and assuming you're interested in a tree structure with the School
at the top):
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install SimpleFlatMapper
You can use SimpleFlatMapper 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 SimpleFlatMapper 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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