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Querydsl using maven
Querydsl using maven

java – Maven Integration with Query DSL – Stack Overflow

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java - Maven Integration with Query DSL - Stack Overflow
java – Maven Integration with Query DSL – Stack Overflow

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2. Getting started with Querydsl

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  • Summary of article content: Articles about 2. Getting started with Querydsl PersistenceCapable annotation and generates Querydsl query types for them. Run mvn eclipse:eclipse or clean install and you will get your Query types generated … …
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2 Getting started with Querydsl

21 Querying JDO sources

2. Getting started with Querydsl
2. Getting started with Querydsl

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querydsl-maven-plugin · GitHub Topics · GitHub

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querydsl-maven-plugin · GitHub Topics · GitHub
querydsl-maven-plugin · GitHub Topics · GitHub

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Sự cố Eclipse với bản dựng Maven và JDK khi tạo lớp Q trong Querydsl

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  • Summary of article content: Articles about Sự cố Eclipse với bản dựng Maven và JDK khi tạo lớp Q trong Querydsl Khi tôi thêm mã này bên dưới vào của tôi pom.xmlđể hỗ trợ Querydsl com.mysema.maven apt-maven-plugin 1.0.6 … …
  • Most searched keywords: Whether you are looking for Sự cố Eclipse với bản dựng Maven và JDK khi tạo lớp Q trong Querydsl Khi tôi thêm mã này bên dưới vào của tôi pom.xmlđể hỗ trợ Querydsl com.mysema.maven apt-maven-plugin 1.0.6 … Khi tôi thêm mã này bên dưới vào của tôi pom.xmlđể hỗ trợ Querydsl com.mysema.maven apt-maven-plugin 1.0.6…java, eclipse, maven, querydsl
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Sự cố Eclipse với bản dựng Maven và JDK khi tạo lớp Q trong Querydsl
Sự cố Eclipse với bản dựng Maven và JDK khi tạo lớp Q trong Querydsl

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Sự cố Eclipse với bản dựng Maven và JDK khi tạo lớp Q trong Querydsl

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  • Summary of article content: Articles about Sự cố Eclipse với bản dựng Maven và JDK khi tạo lớp Q trong Querydsl xml, the plugin is reposible for generating the Querydsl es we are looking for. This plugin will generate the required s during the maven build … …
  • Most searched keywords: Whether you are looking for Sự cố Eclipse với bản dựng Maven và JDK khi tạo lớp Q trong Querydsl xml, the plugin is reposible for generating the Querydsl es we are looking for. This plugin will generate the required s during the maven build … Khi tôi thêm mã này bên dưới vào của tôi pom.xmlđể hỗ trợ Querydsl com.mysema.maven apt-maven-plugin 1.0.6…java, eclipse, maven, querydsl
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Sự cố Eclipse với bản dựng Maven và JDK khi tạo lớp Q trong Querydsl
Sự cố Eclipse với bản dựng Maven và JDK khi tạo lớp Q trong Querydsl

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Maven Integration with Query DSL

I am trying to integrate an existing project in maven with query dsl I have added the dependencies as below `

com.mysema.querydsl querydsl-apt 2.5.0 provided com.mysema.querydsl querydsl-jpa 2.5.0 org.slf4j slf4j-log4j12 1.6.1 `

and also configured the above as per the documentation and did Maven Clean it is build successfully but It fails when I do Maven Install error above

com.mysema.maven maven-apt-plugin 1.0.3 process target/generated-sources/java com.mysema.query.apt.jpa.JPAAnnotationProcessor

When I do Maven Install – BUILD FAILURE and cant resolve the dependency for query DSL isn’t maven supposed to do this on its own.

[WARNING] The POM for com.mysema.querydsl:querydsl-apt:jar:2.5.0 is missing, no dependency information available [WARNING] The POM for com.mysema.querydsl:querydsl-jpa:jar:2.5.0 is missing, no dependency information available [INFO] BUILD FAILURE

what am I missing?

2. Getting started with Querydsl

Instead of a general Getting started guide we provide integration guides for the main backends of Querydsl.

2.1. Querying JDO sources

Querydsl defines a general statically typed syntax for querying on top of persisted domain model data. JDO and JPA are the primary integration technologies for Querydsl. This guide describes how to use Querydsl in combination with JDO. Support for JDO is in beta phase and still to be considered experimental.

2.1.1. Maven integration Add the following dependencies to your Maven project and make sure that the Maven 2 repo of Mysema Source (http://source.mysema.com/maven2/releases) is accessible from your POM if the version cannot yet be found in other public Maven repos : com.mysema.querydsl querydsl-apt 0.5.4 provided com.mysema.querydsl querydsl-jdoql 0.5.4 And now, configure the Maven APT plugin which generates the query types used by Querydsl : … com.mysema.maven maven-apt-plugin 0.2.0 process target/generated-sources/java com.mysema.query.apt.jdo.JDOAnnotationProcessor … The JDOAnnotationProcessor finds domain types annotated with the javax.jdo.annotations.PersistenceCapable annotation and generates Querydsl query types for them. Run mvn eclipse:eclipse or clean install and you will get your Query types generated into target/generated-sources/java. Now you are able to construct JDOQL query instances and instances of the query domain model.

2.1.2. Using query types To create queries with Querydsl you need to instantiate variables and Query implementations. We will start with the variables. Let’s assume that your project has the following domain type : @PersistenceCapable public class Customer { private String firstName; private String lastName; public String getFirstName(){ return firstName; } public String getLastName(){ return lastName; } public void setFirstName(String fn){ firstName = fn; } public void setLastName(String ln)[ lastName = ln; } } Querydsl will generate a query type with the simple name QCustomer into the same package as Customer. QCustomer can be used as a statically typed variable in Querydsl queries as a representative for the Customer type. QCustomer has a default instance variable which can be accessed as a static field : QCustomer customer = QCustomer.customer; Alternatively you can define your own Customer variables like this : QCustomer customer = new QCustomer( “myCustomer” ); QCustomer reflects all the properties of the original type Customer as public fields. The firstName field can be accessed like this customer.firstName; The generated Querydsl query types are based on a builtin expression type system. The Querydsl expression archetypes are presented in more detailed on this page : [Querydsl expressions].

2.1.3. Querying with JDOQL For the JDOQL-module JDOQLQueryImpl is the main Query implementation. It is instantiated like this : PersistenceManager pm; JDOQLQuery query = new JDOQLQueryImpl (pm); To retrieve the customer with the first name Bob you would construct a query like this : QCustomer customer = QCustomer.customer; JDOQLQuery query = new JDOQLQueryImpl (pm); Customer bob = query.from(customer) .where(customer.firstName.eq( “Bob” )) .uniqueResult(customer); query.close(); The from call defines the query source, the where part defines the filter and uniqueResult defines the projection and tells Querydsl to return a single element. Easy, right? To create a query with multiple sources you just use the JDOQLQuery interface like this : query.from(customer, company); And to use multiple filters use it like this query.from(customer) .where(customer.firstName.eq( “Bob” ), customer.lastName.eq( “Wilson” )); Or like this query.form(customer) .where(customer.firstName.eq( “Bob” ).and(customer.lastName.eq( “Wilson” )));

2.1.4. General usage Use the the cascading methods of the JDOQLQuery method like this from : Define the query sources here, the first argument becomes the main source and the others are treated as variables. where : Define the query filters, either in varargs form separated via commas or cascaded via the and-operator. groupBy : Define the group by arguments in varargs form. having : Define the having filter of the “group by” grouping as an varargs array of EBoolean expressions. orderBy : Define the ordering of the result as an varargs array of order expressions. Use asc() and desc() on numeric, string and other comparable expression to access the OrderSpecifier instances. limit, offset, restrict : Define the paging of the result. Limit for max results, offset for skipping rows and restrict for defining both in one call.

2.1.5. Ordering The syntax for declaring ordering is query.from(customer) .orderBy(customer.lastName.asc(), customer.firstName.desc()) .list(customer);

2.1.6. Grouping Grouping can be done in the following form query.from(customer) .groupBy(customer.lastName) .list(customer.lastName);

2.1.7. Delete clauses Delete clauses in Querydsl JDOQL follow a simple delete-where-execute form. Here are some examples : QCat cat = QCat.cat; new JDOQLDeleteClause(pm, cat).execute(); new JDOQLDeleteClause(pm, cat).where(cat.kittens.isNotEmpty()).execute(); The second parameter of the JDOQLDeleteClause constructor is the entity to be deleted. The where call is optional and the execute call performs the deletion and returns the amount of deleted entities.

Sự cố Eclipse với bản dựng Maven và JDK khi tạo lớp Q trong Querydsl

GIẢI PHÁP 1

Theo liên kết này

“Plugin Maven APT có một vấn đề đã biết ngăn cản việc sử dụng nó trực tiếp từ Eclipse. Người dùng Eclipse phải tạo các loại truy vấn Querydsl theo cách thủ công bằng cách chạy lệnh mvn create-sources tại dấu nhắc lệnh.”

Vì vậy, tôi thực hiện dòng lệnh mvn generate-sources trong bộ mã hóa dự án của mình với bảng điều khiển cmd và tôi đã tạo Qclasses của mình.

GIẢI PHÁP 2 từ bình luận @ Informatik01

chúng tôi rõ ràng có thể quy định JVM trong eclipse.ini như thế:

-vm C:\Program Files\Java\jdk1.7.0_45\bin\javaw.exe -vmargs …

So you have finished reading the maven querydsl topic article, if you find this article useful, please share it. Thank you very much. See more: Querydsl, Querydsl-maven-plugin, Querydsl maven, Apt-maven-plugin, Querydsl-jpa maven, Querydsl-apt, Querydslpredicateexecutor maven, Com mysema maven

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