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Thanks to that we can easily create statements that are not known at compile time.
o
URL_http://www.querydsl.com/ [Querydsl] and URL_http://www.jooq.org [jOOQ] are two popular choices.
p
Note: I work for the company behind Querydsl.
o
Which one do you use?
o
:).
o
JOOQ is maybe a better choice for hardcore SQL development, but Querydsl has a simpler API and supports also other backends (JPA, JDO, Lucene, Mongodb etc.
p
); I am also in the company behind Querydsl.
o
We use Querydsl SQL in a few of our in house projects.
o
I have no personal experience of jooq but I have heard that it is quite ok.
o
I do hardcore SQL development.
o
I've used both JOOQ and QueryDSL.
o
Both are quite good but I prefer the latter.
p
The code and project management is more mature.
o
The problem with QueryDsl is that you can't use it as a pure query generator as it does not give you the generated query itself.
o
It will generate the query and execute it for you too.
o
You can't get one without another.
o
@abhinav-sarkar Querydsl supports that, just not as directly as JOOQ.
o
@TimoWestkmper can you point me to the methods to do that?
o
I went through the javadocs and the code but couldn't find anything.
o
You can for example describe the query as a subquery and then serialize it via the SQLSerializer URL_http://www.querydsl.com/static/querydsl/2.9.0/apidocs/com/my sema/query/sql/SQLSerializer.html#serialize%28com.mysema.query.QueryMetadata,% 20boolean%29 If you want a more convenient way to get the SQL String and bindin...
o
Querydsl and jOOQ seem to be the most popular and mature choices however there's one thing to be aware of: Both rely on the concept of code generation, where meta classes are generated for database tables and fields.
p
This facilitates a nice, clean DSL but it faces a problem when trying to create queries for databases that are only known at runtime, like in the OP's example above.
p
While jOOQ supports a String based approached there are some quirks.
o
The documentation of Querydsl doesn't mention whether it's possible to not use code generation.
o
Please correct me if I'm wrong.
n
URL_https://github.com/fuzzylollipop/sqlck [SQL-Construction-Kit] is a very flexilble, no dependency framework.
p
Development recently moved from code.google.com to github.
o
It is also available from Maven Central Repository via Sonatype.
o
It's a pity they support only mssql, oracle and sql99.
n
No mysql, firebird etc.
o
Also no documentation visible...
o
SQL99 is a generic implementation that will should work with any database.
o
If you add support for specific databases, and sent a pull request, I can guarantee it will get into the mainline code base.
o
Thanks.
o
Can you make some examples, please?
o
Don't want to dig into the code just to find out how it works at all.
p
about SQL99: I could tell you one thousand reasons why that be true.
o
And two thousand reasons, why it Take a simple select 1, which also comes in at least these flavours: select 1 from dual, select 1 from sysibm.dual, select 1 from sysibm.sysdummy1, select 1 from information_schema.system_users... Oh don't get me started :-).
p
I can recommend URL_http://www.jooq.org [jOOQ] .
p
It provides a lot of great features, also a intuitive DSL for SQL and a extremly customable reverse- engineering approach.
p
jOOQ effectively combines complex SQL, typesafety, source code generation, active records, stored procedures, advanced data types, and Java in a fluent, intuitive DSL.
n
Do you use it?
o
How do you find it?
o
I use it to generate custom source code from DDL.
o
It's working great!.
p
Hibernate Criteria API (not plain SQL though, but very powerful and in active development): CODESNIPPET_JAVA1 .
p
The problem is that it doesn't map to SQL as I understand, right?
o
this doesn't generate SQL and is a nightmare to debug when it doesn't follow the rule of least astonishment ( doesn't work as expected ).
o
It does generate SQL (at the end) and it surprises no one.
o
Benefit -- it is portable across databases.
p
+1 Upvoted again to level up.
p
I don't know why this was downvoted.
n
After all, it's become the standard way of doing this with JPA, even if it's a bit verbose...
n
What is the level of query complexity that you achieved to reach with the JPA Criteria API, without making the query utterly unreadable?
o
Do you have an example of a nested select in an IN / EXISTS clause, or of a self-join using aliases for the Sale entity, etc?
o
I'm curious.
o
Comments do not give much space to provide the examples, but you're welcome to review them at URL_http://docs.jboss.org/hibernate/core/3.5/reference/en/html/querycriteria.html .
p
URL_http://db.apache.org/ddlutils/ [ddlutils] is my best choice: URL_http://db .apache.org/ddlutils/api/org/apache/ddlutils/platform/SqlBuilder.html [http:// db.apache.org/ddlutils/api/org/apache/ddlutils/platform/SqlBuilder.html] here is create example(groovy): CODESNIPPET_JAVA1 .
p
SQL parser library for Java.
o
Is there a good open-source Java library for parsing SQL statements?
o
If possible, it should be customizable or flexible enough to also be able to parse (or at least ignore) vendor-specific syntax (such as Oracle tablespace definitions or MySQL's LIMIT clause).
p
If not, strict adherence to the SQL standard is also fine.
p
I need this for two things: providing an SQL interface to a non-SQL database (mapping to internal API calls) rewriting SQL before it goes to the actual database (e.g.
o
Oracle) .
o
URL_http://jparsec.codehaus.org .
o
how is this question not constructive?
o
what's wrong with you, Stackoverflow?
o
URL_http://www.antlr3.org/grammar/list.html [ANTLR] has an ANSI SQL grammar available.
o
You can use that to create your own parser.
o
Why use ANTLR when you can implement your own parser generator?
o
Why generate your own parser generator when you can use ANTLR?
o
Any links to how one can use Antlr SQL Grammar to parse these queries?
o
I looked at the grammar of some PL/SQL Parsers as well as Lexers and Parsers but was unable to fathom how to use one.
p
Would appreciate any links.
p
You feed the grammar to ANTLR, which spits out the lexer/parser classes that you'll then compile and run.
o
The best source I can think of is the ANTLR reference: URL_http://www.amazon.com/Definitive-Antlr-Reference-Domain-Specific - Programmers/dp/0978739256/ref=sr_1_1?ie=UTF8&qid=1327847925&sr=8-1.
p
The link [ URL_http://www.antlr.org/grammar/list](http://www.antlr.org/grammar/list ) is broken.
n
Does anyone know where the sql grammar is located?
o
We're up to ANTLR 4 now.
o
Perhaps the old grammars don't run on the new version.
o
URL_http://www.antlr3.org/grammar/list.html .
o
URL_http://jsqlparser.sourceforge.net/ [JSqlParser] .
o
If you need a parser there should be a parser in the code base of URL_http://db.apache.org/derby/ [Apache-Derby] .
o
with vendor-specific SQL** You may want to look at the URL_http://java.sun.com/javase/6/docs/api/java/sql /Connection.html#nativeSQL%28java.lang.String%29 [.native()] method on the jdbc Connection object which you can pass it vendor neutral queries that will get postprocessed into vendor specific queries.
o
That native() method looks interesting.
p
Are there any examples as to how it can be used?
o
What kind of conversions are possible there?
o
URL_http://www.sqlparser.com/sql-parser-java.php [General-SQL-Parser-for-Java] is not open source, but is exactly what you are looking after.
n
The best sql parser for Java +1.
p
Try URL_http://zql.sourceforge.net/ [Zql] .
o
zql is good for basic queries but when you try to parse a query that contains join statement, it blows up.
n
so i don't suggest it.
o
Hibernate uses ANTLR for sql and hql parsing.
o
JSqlParser is also a good option.although it has some bugs(or some features not implemented) while parsing oracle pl/sql.see its forum for detail.
p
so if you're parsing oracle pl/sql, ANTLR is recommended.
p
btw, anltr is under BSD.
o
What you want to do with the parsed SQL?
o
I can recommend a few Java implementation of Lex/Yacc ( URL_http://byaccj.sourceforge.net/ [BYACC/J] , URL_http://www2.cs.tum.edu/projects/cup/ [Java-Cup] ) that you can use an existing SQL grammar with.
p
If you want to actually do something with the resulting parsed grammar, I might suggest looking at URL_http://db.apache.org/derby/ [Derby] , an open source SQL database written in Java.
p
Is the SQL parser used in Derby available as an independent JAR ?
o