Try to find any SQL builder library that support CockroachDb and work well with spring-boot-webflux, spring-data-r2dbc. Or at least library that will just write dynamic SQL statement as string for me that I will provide to database client executor.
Native spring-data-r2dbc DatabaseClient API don't support join statements (https://docs.spring.io/spring-data/r2dbc/docs/1.0.x/reference/html/#r2dbc.datbaseclient.fluent-api.select) that's why I need another way how to write non-plain dynamic SQL.
JOOQ don't support CockroachDB yet(https://github.com/jOOQ/jOOQ/issues/8545).
Is there any library that will fit to my expectations?
PM at Cockroach here. We are working with the team at jOOQ to provide a CockroachDB support in the next few months. In the meantime, you can use pgjdbc with something like JDBI to do query bindings. We are also working on a CockroachDB dialect for Hibernate but you can use the current Postgres dialect as well.
Related
I'm trying to call a UDF using Entity Framework and I was wondering:
if I a use a different provider (LINQ to MySQL, LINQ to PostGreSQL) will it still work?
I've searched the SQL Standard and it's not freely available.
UDF implementations and rules are significially different in MySql, MS SQL and Postgresql. So really the first question is, can you migrate any UDF easily between this DBMSes? Generally, you cann't if you didn't created this UDF to be transferable from the very beginning.
We have an ongoing project in which we use querydsl-jpa to make the queries.
When we deploy a new version of the product, it auto-executes sql file scripts to update the tables before starting hibernate. This scripts are just sql strings manually crafted (and very error prone).
I would like to use querydsl-sql to write the migration scripts programmatically and once that's done, use querydsl-jpa for normal ORM querying.
So the question is, if anyone knows if they can live together in the same project? And if anyone has done that before?
Using Querydsl JPA and SQL in a project together is a very common use case. You can for example use the JPA API and Querydsl JPA for CRUD use cases and Querydsl SQL for queries.
Querydsl SQL doesn't support DDL scripts (CREATE, ALTER etc). So that part is not covered by Querydsl.
After seeing this image:
http://2.bp.blogspot.com/_T-uXeKcGTnM/TIdoKBGwk9I/AAAAAAAABcs/CLW3_cRlN78/s1600/tumblr_kxovt0VLZy1qappj8.png
I wonder is exists any tool for translating SQL querys into MongoDB map/reduce query model??
Larger version of the image: http://rickosborne.org/download/SQL-to-MongoDB.pdf
Update to the question asked in Jan 2011:
A couple of sites exist now to convert sql to mongodb.
Convert MySQL Queries to MongoDB Syntax
http://www.querymongo.com/
And
Convert sql to mongodb
http://klaus.dk/sqltomongodb/
The simple anwser? No.
The slightly more complex anwser is some people have had luck translating more complex SQL to Mapreduce functions ...
http://rickosborne.org/blog/index.php/2010/02/08/playing-around-with-mongodb-and-mapreduce-functions/
http://rickosborne.org/blog/index.php/2010/02/19/yes-virginia-thats-automated-sql-to-mongodb-mapreduce/
However, that said ... generally speaking you might as well learn mapreduce properly because if the data is in MongoDB already ... you'll really need to know how to properly query MongoDB to get anything meaningful done!
MongoDB has wonderful and helpful docs http://www.mongodb.org/display/DOCS/Advanced+Queries
As well as an easy to use online tutorial: http://try.mongodb.org/
The simple answer: Yes. Hibernate OGM - JPA for NoSQL.
JPA is Java API for mapping objects to data stores.
It includes JPQL, a query language similar to SQL which adds the OOP concepts. It's not SQL, but you don't want pure SQL - that was designed for the relational paradigm.
Hibernate OGM proposes to simplify the programming model by embracing JPA/Hibernate APIs and semantics to store data in NoSQL stores like JBoss Enterprise Data Grid instead of the traditional RDBMS. (source)
Also see this Hibernate OGM: JPA for NoSQL talk by Hardy Ferentschik
Recently I happened to see this website mongoquery.com, you can try it.
You can use free sql to mongodb converter like: https://rapidapi.com/ariefsam/api/easy-sql-to-mongodb-aggregation/
Just to add to the last comment
re:The simple answer: Yes. Hibernate OGM - JPA for NoSQL.
JPA is Java API for mapping objects to data stores.
It includes JPQL, a query language similar to SQL which adds the OOP concepts. It's not SQL, but you don't want pure SQL - that was designed for the relational paradigm.
There is a company called UnityJDBC that has released a JDBC driver for Mongo that allows you to run SQL queries against mongo in any java application that supports JDBC.
you can download this driver free at
http://www.unityjdbc.com/mongojdbc/mongo_jdbc.php
hope this helps
You can also http://teiid.org which gives full range of SQL based access to MongoDB. You can use SQL through JDBC/ODBC or use REST/ODATA based access to MongoDB. Teiid uses MongoDB's aggregation framework to provide advanced SQL MongoDB query conversation.
After seeing this image:
http://2.bp.blogspot.com/_T-uXeKcGTnM/TIdoKBGwk9I/AAAAAAAABcs/CLW3_cRlN78/s1600/tumblr_kxovt0VLZy1qappj8.png
I wonder is exists any tool for translating SQL querys into MongoDB map/reduce query model??
Larger version of the image: http://rickosborne.org/download/SQL-to-MongoDB.pdf
Update to the question asked in Jan 2011:
A couple of sites exist now to convert sql to mongodb.
Convert MySQL Queries to MongoDB Syntax
http://www.querymongo.com/
And
Convert sql to mongodb
http://klaus.dk/sqltomongodb/
The simple anwser? No.
The slightly more complex anwser is some people have had luck translating more complex SQL to Mapreduce functions ...
http://rickosborne.org/blog/index.php/2010/02/08/playing-around-with-mongodb-and-mapreduce-functions/
http://rickosborne.org/blog/index.php/2010/02/19/yes-virginia-thats-automated-sql-to-mongodb-mapreduce/
However, that said ... generally speaking you might as well learn mapreduce properly because if the data is in MongoDB already ... you'll really need to know how to properly query MongoDB to get anything meaningful done!
MongoDB has wonderful and helpful docs http://www.mongodb.org/display/DOCS/Advanced+Queries
As well as an easy to use online tutorial: http://try.mongodb.org/
The simple answer: Yes. Hibernate OGM - JPA for NoSQL.
JPA is Java API for mapping objects to data stores.
It includes JPQL, a query language similar to SQL which adds the OOP concepts. It's not SQL, but you don't want pure SQL - that was designed for the relational paradigm.
Hibernate OGM proposes to simplify the programming model by embracing JPA/Hibernate APIs and semantics to store data in NoSQL stores like JBoss Enterprise Data Grid instead of the traditional RDBMS. (source)
Also see this Hibernate OGM: JPA for NoSQL talk by Hardy Ferentschik
Recently I happened to see this website mongoquery.com, you can try it.
You can use free sql to mongodb converter like: https://rapidapi.com/ariefsam/api/easy-sql-to-mongodb-aggregation/
Just to add to the last comment
re:The simple answer: Yes. Hibernate OGM - JPA for NoSQL.
JPA is Java API for mapping objects to data stores.
It includes JPQL, a query language similar to SQL which adds the OOP concepts. It's not SQL, but you don't want pure SQL - that was designed for the relational paradigm.
There is a company called UnityJDBC that has released a JDBC driver for Mongo that allows you to run SQL queries against mongo in any java application that supports JDBC.
you can download this driver free at
http://www.unityjdbc.com/mongojdbc/mongo_jdbc.php
hope this helps
You can also http://teiid.org which gives full range of SQL based access to MongoDB. You can use SQL through JDBC/ODBC or use REST/ODATA based access to MongoDB. Teiid uses MongoDB's aggregation framework to provide advanced SQL MongoDB query conversation.
Are there any free (gratis) providers for databases other MS SQL (e.g. MySQL or SQLite) that work with LINQ and support dynamic SQL query generation? E.g. table.Count() generates something like SELECT COUNT(*) FROM table and doesn't first load the whole table and then count the rows.
Here is the DBLinq project: http://code.google.com/p/dblinq2007/
DbLinq is THE LINQ provider that allows to use common databases with an API close to Linq to SQL. It currently supports (by order of appearance): MySQL, Oracle, PostgreSQL, SQLite, Ingres, Firebird
Whether these providers execute Count() in the way you describe depends on the quality of the provider, I suppose. Presumably some effort is made at optimization.
See also http://weblogs.asp.net/scottgu/archive/2008/01/07/dynamic-linq-part-1-using-the-linq-dynamic-query-library.aspx
Check out ADO.NET Entity Framework. It supports MySQL via ADO.NET data providers and LINQ to Entities (similar to LINQ to SQL). Being a Microsoft tool, it has good Visual Studio integration and support.
Can you also explain why you want to support these databases?
NHibernate supports multiple databases and has a recently-released Linq provider.