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querydsl | Unified Queries for Java | Object-Relational Mapping library

 by   querydsl Java Version: QUERYDSL_5_0_0 License: Apache-2.0

 by   querydsl Java Version: QUERYDSL_5_0_0 License: Apache-2.0

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kandi X-RAY | querydsl Summary

querydsl is a Java library typically used in Utilities, Object-Relational Mapping, MongoDB, Hibernate, JPA applications. querydsl has no bugs, it has no vulnerabilities, it has build file available, it has a Permissive License and it has high support. You can download it from GitHub, Maven.
Querydsl is a framework which enables the construction of type-safe SQL-like queries for multiple backends including JPA, MongoDB and SQL in Java. Instead of writing queries as inline strings or externalizing them into XML files they are constructed via a fluent API. Use these tutorials to get started. Free support is provided in the Discussion Section and on StackOverflow. Please do not post questions as issue. Such issues will be closed immediately. Querydsl provides releases via public Maven repositories, but you can also build the sources yourself like this. Where projectname is one of the Maven profiles (e.g. jpa, sql, mongodb, etc. or all). For more information visit the project homepage at https://querydsl.github.io.
Support
Support
Quality
Quality
Security
Security
License
License
Reuse
Reuse

kandi-support Support

  • querydsl has a highly active ecosystem.
  • It has 3754 star(s) with 771 fork(s). There are 162 watchers for this library.
  • It had no major release in the last 12 months.
  • There are 109 open issues and 1749 have been closed. On average issues are closed in 390 days. There are 49 open pull requests and 0 closed requests.
  • It has a positive sentiment in the developer community.
  • The latest version of querydsl is QUERYDSL_5_0_0
querydsl Support
Best in #Object-Relational Mapping
Average in #Object-Relational Mapping
querydsl Support
Best in #Object-Relational Mapping
Average in #Object-Relational Mapping

quality kandi Quality

  • querydsl has 0 bugs and 0 code smells.
querydsl Quality
Best in #Object-Relational Mapping
Average in #Object-Relational Mapping
querydsl Quality
Best in #Object-Relational Mapping
Average in #Object-Relational Mapping

securitySecurity

  • querydsl has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
  • querydsl code analysis shows 0 unresolved vulnerabilities.
  • There are 0 security hotspots that need review.
querydsl Security
Best in #Object-Relational Mapping
Average in #Object-Relational Mapping
querydsl Security
Best in #Object-Relational Mapping
Average in #Object-Relational Mapping

license License

  • querydsl is licensed under the Apache-2.0 License. This license is Permissive.
  • Permissive licenses have the least restrictions, and you can use them in most projects.
querydsl License
Best in #Object-Relational Mapping
Average in #Object-Relational Mapping
querydsl License
Best in #Object-Relational Mapping
Average in #Object-Relational Mapping

buildReuse

  • querydsl releases are available to install and integrate.
  • Deployable package is available in Maven.
  • Build file is available. You can build the component from source.
  • Installation instructions are not available. Examples and code snippets are available.
  • querydsl saves you 116664 person hours of effort in developing the same functionality from scratch.
  • It has 134833 lines of code, 14975 functions and 2282 files.
  • It has medium code complexity. Code complexity directly impacts maintainability of the code.
querydsl Reuse
Best in #Object-Relational Mapping
Average in #Object-Relational Mapping
querydsl Reuse
Best in #Object-Relational Mapping
Average in #Object-Relational Mapping
Top functions reviewed by kandi - BETA

kandi has reviewed querydsl and discovered the below as its top functions. This is intended to give you an instant insight into querydsl implemented functionality, and help decide if they suit your requirements.

  • Serialize for a prepared query .
  • Generate the entity s properties .
  • Create an Evaluator for the given joins
  • Create class type .
  • Process an entity element .
  • Collect all elements from the configuration .
  • Intercept the return value .
  • Handles a single table .
  • Executes the update .
  • Add property handling .

querydsl Key Features

Querying JPA

Querying SQL

Querying Mongodb

Querying Lucene

Querying Collections

Querydsl Spatial

Querying JDO

Oracle Express Edition 11g

PostgreSQL 9.1.10

MySQL 5.5.34

Cubrid 9.2

Querydsl

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$ mvn -Pquickbuild,{projectname} clean install

how to do a count query when using rust diesel

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let query_result = query.select(count(id)).first(&connection).map(|x| x as i32);
users
    .filter(user_id.eq(_user_id))
    .count()
    .get_result(conn) // Result<i64, Error>
article_favorites
    .filter(channel_id.eq(req_channel_id))
    .count()
    .get_result(&connection)
-----------------------
let query_result = query.select(count(id)).first(&connection).map(|x| x as i32);
users
    .filter(user_id.eq(_user_id))
    .count()
    .get_result(conn) // Result<i64, Error>
article_favorites
    .filter(channel_id.eq(req_channel_id))
    .count()
    .get_result(&connection)
-----------------------
let query_result = query.select(count(id)).first(&connection).map(|x| x as i32);
users
    .filter(user_id.eq(_user_id))
    .count()
    .get_result(conn) // Result<i64, Error>
article_favorites
    .filter(channel_id.eq(req_channel_id))
    .count()
    .get_result(&connection)

How to filter stream in java with few parameters?

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@Query("SELECT u FROM User u WHERE u.status = ?1 and u.name = ?2")
User findUserByStatusAndName(Integer status, String name);

store spring JPA repository find data to variable before save?

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T dbDomain = get(updated.getId());
entityManager.detach(dbDomain); // <--
T updatedData = repository.save(updated);    

web::block() fails with &quot;`NonNull&lt;pq_sys::pg_conn&gt;` cannot be shared between threads safely&quot;

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#[macro_use]
extern crate diesel;

use diesel::result::Error;

use actix_web::web;
use diesel::{PgConnection, QueryDsl, RunQueryDsl};
use r2d2::{Pool, PooledConnection};
use r2d2_diesel::ConnectionManager;
use schema::tests::dsl::*;

pub mod schema;

pub type MyDBConnectionManager = ConnectionManager<PgConnection>;
pub type MyPool = Pool<MyDBConnectionManager>;
pub type MyDBConnection = PooledConnection<MyDBConnectionManager>;

struct S { }

impl S {
    async fn download_and_store_object(pool: web::Data<MyPool>) -> Result<(), Error>
    {

        let v_data_size: Option<i64> = web::block(move || -> Result<_, Error> {
            let conn = pool.get().expect("couldn't get db connection from pool");

            Ok(tests.select(b).get_result::<Option<i64>>(&conn)?)
        }).await.unwrap();

        Ok(())

    }
}

Upgrade to springboot 2.6.1 with querydsl jpa 5.0.0

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 <dependency>
      <groupId>com.querydsl</groupId>
      <artifactId>querydsl-apt</artifactId>
      <version>${querydsl.version}</version> 
      <classifier>jpa</classifier>
      <scope>provided</scope>
 </dependency> 
 <dependency>
      <groupId>com.querydsl</groupId>
      <artifactId>querydsl-jpa</artifactId>
      <version>${querydsl.version}</version> 
 </dependency>

QueryDsl reduce expression stream

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BooleanBuilder reduce = Stream.of(
            QPatient.patient.id.isNull(),
            QPatient.patient.id.isNull()
        ).reduce(new BooleanBuilder(), BooleanBuilder::and, BooleanBuilder::and);

rust diesel method `filter` exists for schema table, but its trait bounds were not satisfied?

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use diesel::expression_methods::ExpressionMethods;
use diesel::query_dsl::QueryDsl;
use diesel::prelude::*;
-----------------------
use diesel::expression_methods::ExpressionMethods;
use diesel::query_dsl::QueryDsl;
use diesel::prelude::*;

How to build DSL paths with Hibernate

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public class DSLProperty {
    protected String previousPath; // this will hold the path till the current step of the path chain

    public DSLProperty( String previousPath ) {
        this.previousPath = previousPath;
    }

    public String getPath() { return previousPath; }
}
public static class DSL extends DSLProperty {
    protected DSL( String input ) {
        super( input );
    }

    public DSLProperty id() {
        return property( "id" );
    }

    protected DSLProperty property( String property ) {
         return new DSLProperty( ( previousPath != null ? previousPath + "." : "" ) + property );
    }
}
@Entity
@Table
public class DSLTestUser extends DSLTestBaseEntity {
    public static DSL alias( String alias ) { return new DSL( alias ); }

    public static class DSL extends DSLTestBaseEntity.DSL {
        public DSL( String input ) {
            super( input );
        }
        public DSLProperty username() { return property( "username" ); }
        public DSLTestPerson.DSL person() { return DSLTestPerson.alias( previousPath + ".person" ); }
    }

    // all the columns, getters & setters etc.
}
@Entity
@Table
public class DSLTestPerson extends DSLTestBaseEntity {
    public static DSL alias( String alias ) { return new DSL( alias ); }

    public static class DSL extends DSLTestBaseEntity.DSL {
        public DSL( String input ) {
            super( input );
        }
        public DSLProperty name() { return property( "name" ); }
        public DSLTestUser.DSL user() { return DSLTestUser.alias( previousPath + ".user" ); }
    }

    // all the columns, getters & setters etc.
}
System.out.println( DSLTestUser.alias( "tu" ).person().id().getPath() );
System.out.println( DSLTestUser.alias( "tu" ).username().getPath() );
System.out.println( DSLTestPerson.alias( "tp" ).user().username().getPath() );
System.out.println( DSLTestPerson.alias( "tp" ).getPath() );
tu.person.id
tu.username
tp.user.username
tp
-----------------------
public class DSLProperty {
    protected String previousPath; // this will hold the path till the current step of the path chain

    public DSLProperty( String previousPath ) {
        this.previousPath = previousPath;
    }

    public String getPath() { return previousPath; }
}
public static class DSL extends DSLProperty {
    protected DSL( String input ) {
        super( input );
    }

    public DSLProperty id() {
        return property( "id" );
    }

    protected DSLProperty property( String property ) {
         return new DSLProperty( ( previousPath != null ? previousPath + "." : "" ) + property );
    }
}
@Entity
@Table
public class DSLTestUser extends DSLTestBaseEntity {
    public static DSL alias( String alias ) { return new DSL( alias ); }

    public static class DSL extends DSLTestBaseEntity.DSL {
        public DSL( String input ) {
            super( input );
        }
        public DSLProperty username() { return property( "username" ); }
        public DSLTestPerson.DSL person() { return DSLTestPerson.alias( previousPath + ".person" ); }
    }

    // all the columns, getters & setters etc.
}
@Entity
@Table
public class DSLTestPerson extends DSLTestBaseEntity {
    public static DSL alias( String alias ) { return new DSL( alias ); }

    public static class DSL extends DSLTestBaseEntity.DSL {
        public DSL( String input ) {
            super( input );
        }
        public DSLProperty name() { return property( "name" ); }
        public DSLTestUser.DSL user() { return DSLTestUser.alias( previousPath + ".user" ); }
    }

    // all the columns, getters & setters etc.
}
System.out.println( DSLTestUser.alias( "tu" ).person().id().getPath() );
System.out.println( DSLTestUser.alias( "tu" ).username().getPath() );
System.out.println( DSLTestPerson.alias( "tp" ).user().username().getPath() );
System.out.println( DSLTestPerson.alias( "tp" ).getPath() );
tu.person.id
tu.username
tp.user.username
tp
-----------------------
public class DSLProperty {
    protected String previousPath; // this will hold the path till the current step of the path chain

    public DSLProperty( String previousPath ) {
        this.previousPath = previousPath;
    }

    public String getPath() { return previousPath; }
}
public static class DSL extends DSLProperty {
    protected DSL( String input ) {
        super( input );
    }

    public DSLProperty id() {
        return property( "id" );
    }

    protected DSLProperty property( String property ) {
         return new DSLProperty( ( previousPath != null ? previousPath + "." : "" ) + property );
    }
}
@Entity
@Table
public class DSLTestUser extends DSLTestBaseEntity {
    public static DSL alias( String alias ) { return new DSL( alias ); }

    public static class DSL extends DSLTestBaseEntity.DSL {
        public DSL( String input ) {
            super( input );
        }
        public DSLProperty username() { return property( "username" ); }
        public DSLTestPerson.DSL person() { return DSLTestPerson.alias( previousPath + ".person" ); }
    }

    // all the columns, getters & setters etc.
}
@Entity
@Table
public class DSLTestPerson extends DSLTestBaseEntity {
    public static DSL alias( String alias ) { return new DSL( alias ); }

    public static class DSL extends DSLTestBaseEntity.DSL {
        public DSL( String input ) {
            super( input );
        }
        public DSLProperty name() { return property( "name" ); }
        public DSLTestUser.DSL user() { return DSLTestUser.alias( previousPath + ".user" ); }
    }

    // all the columns, getters & setters etc.
}
System.out.println( DSLTestUser.alias( "tu" ).person().id().getPath() );
System.out.println( DSLTestUser.alias( "tu" ).username().getPath() );
System.out.println( DSLTestPerson.alias( "tp" ).user().username().getPath() );
System.out.println( DSLTestPerson.alias( "tp" ).getPath() );
tu.person.id
tu.username
tp.user.username
tp
-----------------------
public class DSLProperty {
    protected String previousPath; // this will hold the path till the current step of the path chain

    public DSLProperty( String previousPath ) {
        this.previousPath = previousPath;
    }

    public String getPath() { return previousPath; }
}
public static class DSL extends DSLProperty {
    protected DSL( String input ) {
        super( input );
    }

    public DSLProperty id() {
        return property( "id" );
    }

    protected DSLProperty property( String property ) {
         return new DSLProperty( ( previousPath != null ? previousPath + "." : "" ) + property );
    }
}
@Entity
@Table
public class DSLTestUser extends DSLTestBaseEntity {
    public static DSL alias( String alias ) { return new DSL( alias ); }

    public static class DSL extends DSLTestBaseEntity.DSL {
        public DSL( String input ) {
            super( input );
        }
        public DSLProperty username() { return property( "username" ); }
        public DSLTestPerson.DSL person() { return DSLTestPerson.alias( previousPath + ".person" ); }
    }

    // all the columns, getters & setters etc.
}
@Entity
@Table
public class DSLTestPerson extends DSLTestBaseEntity {
    public static DSL alias( String alias ) { return new DSL( alias ); }

    public static class DSL extends DSLTestBaseEntity.DSL {
        public DSL( String input ) {
            super( input );
        }
        public DSLProperty name() { return property( "name" ); }
        public DSLTestUser.DSL user() { return DSLTestUser.alias( previousPath + ".user" ); }
    }

    // all the columns, getters & setters etc.
}
System.out.println( DSLTestUser.alias( "tu" ).person().id().getPath() );
System.out.println( DSLTestUser.alias( "tu" ).username().getPath() );
System.out.println( DSLTestPerson.alias( "tp" ).user().username().getPath() );
System.out.println( DSLTestPerson.alias( "tp" ).getPath() );
tu.person.id
tu.username
tp.user.username
tp
-----------------------
public class DSLProperty {
    protected String previousPath; // this will hold the path till the current step of the path chain

    public DSLProperty( String previousPath ) {
        this.previousPath = previousPath;
    }

    public String getPath() { return previousPath; }
}
public static class DSL extends DSLProperty {
    protected DSL( String input ) {
        super( input );
    }

    public DSLProperty id() {
        return property( "id" );
    }

    protected DSLProperty property( String property ) {
         return new DSLProperty( ( previousPath != null ? previousPath + "." : "" ) + property );
    }
}
@Entity
@Table
public class DSLTestUser extends DSLTestBaseEntity {
    public static DSL alias( String alias ) { return new DSL( alias ); }

    public static class DSL extends DSLTestBaseEntity.DSL {
        public DSL( String input ) {
            super( input );
        }
        public DSLProperty username() { return property( "username" ); }
        public DSLTestPerson.DSL person() { return DSLTestPerson.alias( previousPath + ".person" ); }
    }

    // all the columns, getters & setters etc.
}
@Entity
@Table
public class DSLTestPerson extends DSLTestBaseEntity {
    public static DSL alias( String alias ) { return new DSL( alias ); }

    public static class DSL extends DSLTestBaseEntity.DSL {
        public DSL( String input ) {
            super( input );
        }
        public DSLProperty name() { return property( "name" ); }
        public DSLTestUser.DSL user() { return DSLTestUser.alias( previousPath + ".user" ); }
    }

    // all the columns, getters & setters etc.
}
System.out.println( DSLTestUser.alias( "tu" ).person().id().getPath() );
System.out.println( DSLTestUser.alias( "tu" ).username().getPath() );
System.out.println( DSLTestPerson.alias( "tp" ).user().username().getPath() );
System.out.println( DSLTestPerson.alias( "tp" ).getPath() );
tu.person.id
tu.username
tp.user.username
tp
-----------------------
public class DSLProperty {
    protected String previousPath; // this will hold the path till the current step of the path chain

    public DSLProperty( String previousPath ) {
        this.previousPath = previousPath;
    }

    public String getPath() { return previousPath; }
}
public static class DSL extends DSLProperty {
    protected DSL( String input ) {
        super( input );
    }

    public DSLProperty id() {
        return property( "id" );
    }

    protected DSLProperty property( String property ) {
         return new DSLProperty( ( previousPath != null ? previousPath + "." : "" ) + property );
    }
}
@Entity
@Table
public class DSLTestUser extends DSLTestBaseEntity {
    public static DSL alias( String alias ) { return new DSL( alias ); }

    public static class DSL extends DSLTestBaseEntity.DSL {
        public DSL( String input ) {
            super( input );
        }
        public DSLProperty username() { return property( "username" ); }
        public DSLTestPerson.DSL person() { return DSLTestPerson.alias( previousPath + ".person" ); }
    }

    // all the columns, getters & setters etc.
}
@Entity
@Table
public class DSLTestPerson extends DSLTestBaseEntity {
    public static DSL alias( String alias ) { return new DSL( alias ); }

    public static class DSL extends DSLTestBaseEntity.DSL {
        public DSL( String input ) {
            super( input );
        }
        public DSLProperty name() { return property( "name" ); }
        public DSLTestUser.DSL user() { return DSLTestUser.alias( previousPath + ".user" ); }
    }

    // all the columns, getters & setters etc.
}
System.out.println( DSLTestUser.alias( "tu" ).person().id().getPath() );
System.out.println( DSLTestUser.alias( "tu" ).username().getPath() );
System.out.println( DSLTestPerson.alias( "tp" ).user().username().getPath() );
System.out.println( DSLTestPerson.alias( "tp" ).getPath() );
tu.person.id
tu.username
tp.user.username
tp

Spring REST API, custom entity fields in the response

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 @Ignore
 private Instant creationDate;

QueryDSL with Gradle configuration of annotation processor

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compileJava {
    options.compilerArgs << '-Aquerydsl.generatedAnnotationClass=com.querydsl.core.annotations.Generated'
}

Community Discussions

Trending Discussions on querydsl
  • how to do a count query when using rust diesel
  • How to filter stream in java with few parameters?
  • store spring JPA repository find data to variable before save?
  • web::block() fails with &quot;`NonNull&lt;pq_sys::pg_conn&gt;` cannot be shared between threads safely&quot;
  • FBDriver reporting warnings I can't figure out how to fix
  • PostgreSQL function used in QueryDSL is not working, returns ERROR: syntax error at or near &quot;.&quot;
  • Upgrade to springboot 2.6.1 with querydsl jpa 5.0.0
  • QueryDsl reduce expression stream
  • what is the problem with my rust diesel pagination code
  • error: cannot find attribute `table_name` in this scope
Trending Discussions on querydsl

QUESTION

how to do a count query when using rust diesel

Asked 2022-Mar-27 at 08:21

I am doing a count query using rust 1.59.0 diesel diesel = { version = "1.4.8", features = ["postgres","64-column-tables","chrono"] } following this document, this is my code looks like right now:

use diesel::{ExpressionMethods, QueryDsl, QueryResult, RunQueryDsl};
use diesel::dsl::count;
use rocket::serde::json::Json;
use rust_wheel::config::db::config;

pub fn channel_fav_count(req_channel_id: &i64) -> i32 {
    use crate::model::diesel::dolphin::dolphin_schema::article_favorites::dsl::*;
    let connection = config::establish_connection();
    let query = article_favorites
        .filter(channel_id.eq(req_channel_id));
    let query_result = query.select(count(id)).first(&connection);
    return query_result.unwrap_or(0);
}

when I compile the code, shows error like this:

error[E0277]: the trait bound `i32: FromSql<BigInt, Pg>` is not satisfied
    --> src/service/app/cruise/article/article_fav_service.rs:11:48
     |
11   |     let query_result = query.select(count(id)).first(&connection);
     |                                                ^^^^^ the trait `FromSql<BigInt, Pg>` is not implemented for `i32`

why did this happen? what should I do to fix this problem?

ANSWER

Answered 2022-Mar-27 at 08:21

first thing you must know it's query count return i64 not i32, so you must convert i64 to i32 by your self

maybe like this

let query_result = query.select(count(id)).first(&connection).map(|x| x as i32);

also you can get count by filter query like below

users
    .filter(user_id.eq(_user_id))
    .count()
    .get_result(conn) // Result<i64, Error>

for your code it's like this

article_favorites
    .filter(channel_id.eq(req_channel_id))
    .count()
    .get_result(&connection)

Source https://stackoverflow.com/questions/71634411

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install querydsl

You can download it from GitHub, Maven.
You can use querydsl 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 querydsl 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 .

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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