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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

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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

security Security

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

build Reuse

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 Examples and Code Snippets

See all related Code Snippets

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 "`NonNull<pq_sys::pg_conn>` cannot be shared between threads safely"

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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'
}

See all related Code Snippets

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 "`NonNull<pq_sys::pg_conn>` cannot be shared between threads safely"
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 "."
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

QUESTION

store spring JPA repository find data to variable before save?

Asked 2022-Feb-03 at 14:03

i wanna store spring JPA repository object before it should be saved.

in function update, i wanna store old record data to dbDomain but suddenly after repository.save(updated) the dbDomain changed to new updated data.

any one know how to solve this ? thanks

package com.test.admintool.userauth.services;

import java.text.SimpleDateFormat;
import java.util.*;

import com.test.admintool.engine.common.AdminToolFunction;
import com.test.admintool.engine.common.AuditTrailMessage;
import com.test.admintool.engine.common.CopyUtil;
import com.test.admintool.engine.service.AdminService;
import com.test.admintool.engine.service.AuditTrailEventService;
import com.test.admintool.engine.utils.SecurityUtil;
import com.test.admintool.userauth.entity.User;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.core.GenericTypeResolver;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.transaction.annotation.Transactional;

import com.test.admintool.engine.AdminEntity;
import com.test.admintool.engine.exception.EntityNotFoundException;
import com.test.admintool.engine.repository.AdminRepository;
import com.querydsl.core.types.Predicate;

import javax.persistence.Entity;
import javax.persistence.EntityManager;
import javax.persistence.Table;

@Slf4j
public abstract class AdminServiceImpl<T extends AdminEntity<T>> implements AdminService<T> {

    private static final String AUDIT_ACTION_CREATE = "CREATE";
    private static final String AUDIT_ACTION_UPDATE = "UPDATE";
    private static final String AUDIT_ACTION_DELETE = "DELETE";
    private final AdminRepository<T> repository;

    private final AuditTrailEventService auditTrailEventService;

    protected AdminServiceImpl(AdminRepository<T> repository, AuditTrailEventService auditTrailEventService) {
        this.repository = repository;
        this.auditTrailEventService = auditTrailEventService;
    }

    public T get(Long id) throws EntityNotFoundException {
        return repository.findById(id)
                .orElseThrow(() -> new EntityNotFoundException(String.format("Product %s not found", id)));
    }

    @Transactional
    public T update(T updated) throws EntityNotFoundException {
        T dbDomain = get(updated.getId());
        T updatedData = repository.save(updated);
        produceAuditMessageUpdate(dbDomain, updatedData, AUDIT_ACTION_UPDATE);
        return updatedData;
    }
}

ANSWER

Answered 2022-Feb-03 at 14:03

I assume that you are passing a detached entity instance to the update method, and a new transaction is started when entering the method (by the spring transactional aop proxy).
(Otherwise, the dbDomain entry would be resolved from the hibernate 1st level cache to the passed entity instance updated, so that there would not be any property differences.)

When passing the detached instance updated to the save method, the entity manager will merge it into the persistence context. Thereby, it will also check for another already attached instance of the same entity (same ID), and keep the other instance of the entity in sync by copying all values from the newly passed instance to the other attached instance:
https://github.com/hibernate/hibernate-orm/blob/734b80c531bdb2a9bb33971cd57f51fce662e758/hibernate-core/src/main/java/org/hibernate/event/internal/DefaultMergeEventListener.java#L346
(Which makes sense, since you would otherwise end up with different values on the attached entities, and you could not decide which would be persisted to the DB at the end of the transaction.)

To prevent your dbDomain instance being updated, you could manually detach it from the persistence context before calling save(updated):

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

Alternatively, you may also deep-copy the relevant dbDomain property values.

Source https://stackoverflow.com/questions/70970074

QUESTION

web::block() fails with "`NonNull<pq_sys::pg_conn>` cannot be shared between threads safely"

Asked 2022-Jan-23 at 20:12

#[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 conn_ = pool.get().expect("couldn't get db connection from pool");
        let conn = &conn_;

        let v_data_size: Option<i64> = web::block(move || -> Result<_, Error> {
            Ok(tests.select(b).get_result::<Option<i64>>(&**conn)?)
        }).await.unwrap();

        Ok(())

    }
}

#[actix_web::main]
async fn main() -> std::io::Result<()> {
    Ok(())
}

`NonNull<pq_sys::pg_conn>` cannot be shared between threads safely
within `PooledConnection<ConnectionManager<PgConnection>>`, the trait `Sync` is not implemented for `NonNull<pq_sys::pg_conn>`
required because of the requirements on the impl of `std::marker::Send` for `&PooledConnection<ConnectionManager<PgConnection>>`
required because it appears within the type `[closure@src/main.rs:26:51: 28:10]`rustcE0277

Schema:

table! {
    tests (seq) {
        seq -> Int4,
        a -> Nullable<Bytea>,
        b -> Nullable<Int8>,
    }
}

What is the error? And how to correct it?

ANSWER

Answered 2022-Jan-23 at 20:12

As said in the comments, Conn can not be shared between threads, so in this case you would need to move the Pool handle, and get a connection from within the clusure itself:

#[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(())

    }
}

Source https://stackoverflow.com/questions/70825457

QUESTION

FBDriver reporting warnings I can't figure out how to fix

Asked 2022-Jan-12 at 07:54

I'm developing a RESTful application and whenever I make a request, it works fine, but also outputs these warnings:

o.h.engine.jdbc.spi.SqlExceptionHelper   : SQL Warning Code: 0, SQLState: null
o.h.engine.jdbc.spi.SqlExceptionHelper   : Connection.isValid does not support non-zero timeouts, timeout value 5 has been ignored

Using Spring Boot framework with Hibernate, HikariCP, QueryDSL and a Firebird database using the Jaybird 4.0.5.java11 version.

Here is my application.yml file where I setup the connection with my database:

spring:
  datasource:
    driver-class-name: org.firebirdsql.jdbc.FBDriver
    url: jdbc:firebirdsql://localhost:3050/C:\\path\\to\\my\\database.fdb?encoding=win1252
    username: myuser
    password: mypassword
    hikari:
      connection-timeout: 1000
      login-timeout: 1000
      minimum-idle: 10

  jpa:
    database-platform: org.hibernate.dialect.FirebirdDialect
    hibernate:
      ddl-auto: validate

I've tried all options I could to setup a timeout but none of them made the timeout warning go away.

Also, I can't figure out that SQL Warning Code: 0, from what I've gathered so far, it means it worked, but why is it outputting a warning?

I should mention that I've altered some sensitive information and they were replaced with path\\to\\my\\database.fdb, myuser and mypassword, but these settings work just fine.

ANSWER

Answered 2022-Jan-12 at 07:54

The reason for this is that Jaybird currently doesn't support a timeout for Connection.isValid(int) and ignores it, and thus - if the specified timeout is non-zero - it registers a SQLWarning on the connection (instead of throwing an exception). Although registering a warning here isn't specified in the JDBC specification, this is similar to what JDBC requires a driver to do when it replaces/ignores user-specified values when configuring the result set type, concurrency and holdability.

When Hibernate notices there is a warning registered on the connection, it will log that warning in org.hibernate.engine.jdbc.spi.SqlExceptionHelper. This logging of warnings can be disabled by setting the property hibernate.jdbc.log.warnings=false (see Query Settings in the Hibernate documentation). In case of Spring Boot, I guess you can set this as property spring.jpa.properties.hibernate.jdbc.log.warnings (but I haven't verified this).

The timeout is configurable through the HikariCP property validationTimeout, but - by default - this doesn't accept a value lower than 250 milliseconds (you can change that with system property com.zaxxer.hikari.timeoutMs.floor). Alternatively, you can configure HikariCP property connectionTestQuery with - for example - select 1 from rdb$database, so HikariCP uses the test query instead of Connection.isValid(int). Be aware that a test query has more overhead.

The warning code printed is the SQLWarning.getErrorCode() (technically, SQLException.getErrorCode(), a.k.a the vendor code). And given this warning doesn't have an error/warning code, its value is 0, which simply means "there is no specific vendor code associated with this warning".

I have created this issue to see if actual timeout support can be added in Jaybird 4.0.6 or Jaybird 5.

Disclosure: I am one of the maintainers of Jaybird.

Source https://stackoverflow.com/questions/70597732

QUESTION

PostgreSQL function used in QueryDSL is not working, returns ERROR: syntax error at or near "."

Asked 2021-Dec-20 at 19:23

This is my very first question on stackoverflow, so sorry in advance if anything is not as precise as it should be

In my project, I use Hibernate (as ORM framework) with QueryDSL lib, PostgreSQL as a database.

Basically, I need to check the size of a list 'arr', which is a property of some 'X' class, so I googled and found a way to use postgres functions with querydsl as follows (before you ask, I can't use native queries by the requirements):

BooleanBuilder builder = new BooleanBuilder();

builder.and(Expressions.booleanTemplate("function('array_length', {0})", qX.arr)
                .castToNum(Integer.class).gt(0));

Everything compiles fine, but when the repository method is being called, I get an error:

ERROR: syntax error at or near "." Position: ...

I checked everything, but there are no "." in that position and near positions as well. However, after setting spring.jpa.show-sql=true I found out that there is indeed a "." symbol somewhere in that position, and the result SQL statement looks like this:

... and cast(array_length(.) as int4)>?

which means, that JPA can't put my 'arr' inside the array_length() function (is that so?)

Why does this happen? Am I doing something wrong? Thank you in advance

My entity class looks like that:

    @EqualsAndHashCode(callSuper = true)
    @Entity
    @Table
    @Data
    @NoArgsConstructor
    @TypeDefs({
            @TypeDef(name = "list-array", typeClass = ListArrayType.class)
    })
    public class X extends BaseClass {
    
        // private fields
    
        @Type(type = "list-array")
        @Column(name = "arr", columnDefinition = "bigint[]")
        @ElementCollection
        @OrderColumn
        private List<Long> arr;
    }

I tried without @ElementCollection and @OrderColumn annotations but that gives me cast errors

ANSWER

Answered 2021-Dec-20 at 19:23

@ElementCollection and @OrderColumn are causing a first problem here. After they are removed (and the schema is setup correctly), the function call (SQL template) needs to be corrected.

The problem with @ElementCollection and @OrderColumn is that they represent an alternative approach for storing lists/arrays as part of an entity.
@ElementCollection stores the elements in a separate table, with each element in a separate row (each referencing the entity). To "remember" the correct order, an @OrderColumn is needed as part of the separate table, since rows are returned in arbitrary order if no order is specified (https://stackoverflow.com/a/20050403).

In contrast, ListArrayType and @Column(columnDefinition = "bigint[]") will enable saving the sequence of elements in one column of an entity row. Therefore, no separate table is used, and since the elements are not saved in separate rows, no additional order information is needed.

So without @ElementCollection and @OrderColumn the list mapping is already correctly setup. Be aware that your schema might currently be in a bad state, and you need to make sure that there is a bigint[] column in the entity table (can e.g. be auto-created by hibernate when @ElementCollection and @OrderColumn are removed).

2. Fixing the PostgresQL function call: array_length needs a second argument indicating the dimension of the array along which the length is returned (https://www.postgresql.org/docs/current/functions-array.html). So specifying the template string as follows should get you the correct result:
"function('array_length', {0}, 1)"
("1" being the requested array dimension).

Source https://stackoverflow.com/questions/70393186

QUESTION

Upgrade to springboot 2.6.1 with querydsl jpa 5.0.0

Asked 2021-Dec-20 at 18:58

I am trying to upgrade my springboot version from 2.3.4 to 2.6.1. I use query dsl with jpa and apt-maven-plugin. My issue is that I can't no more generate the QClasses when I run maven compile. I noticed that I am no more able to use an older version of querydsl (previous one 4.4.0 and apt-maven-plugin 1.1.3). Now when I try to use the 4.4.0 I have an error :

Non-resolvable import POM: com.querydsl:querydsl-bom:pom:4.4.0 was not found in https://repo.maven.apache.org/maven2

And then when I switch to the 5.0.0 version I have an other error :

[INFO] --- apt-maven-plugin:1.1.3:process (default) @ gof-referentiel-backend --- [WARNING] The artifact org.apache.commons:commons-io:jar:1.3.2 has been relocated to commons-io:commons-io:jar:1.3.2: https://issues.sonatype.org/browse/MVNCENTRAL-244 /home/ezek/Documents/projects/gof-referentiel-backend/src/main/java/fr/ubordeaux/gof/referentiel/common/persistence/dao/impl/ContactDAOImpl.java:12: error: cannot find symbol import fr.ubordeaux.gof.referentiel.common.persistence.entity.QContactEntity; ^ symbol: class QContactEntity location: package fr.ubordeaux.gof.referentiel.common.persistence.entity /home/ezek/Documents/projects/gof-referentiel-backend/src/main/java/fr/ubordeaux/gof/referentiel/common/persistence/dao/impl/ContactDAOImpl.java:29: error: cannot find symbol private static final QContactEntity qContactEntity = QContactEntity.contactEntity;

I get this error for all the classes that use entities. And nothing is generated.

Here is are the relevant values of my pom.xml :

> <dependency>
>      <groupId>com.querydsl</groupId>
>      <artifactId>querydsl-apt</artifactId>
>      <version>${querydsl.version}</version> 
> </dependency> 
> <dependency>
>      <groupId>com.querydsl</groupId>
>      <artifactId>querydsl-jpa</artifactId>
>      <version>${querydsl.version}</version> 
> </dependency>
> 
> <plugin>
>      <groupId>com.mysema.maven</groupId>
>      <artifactId>apt-maven-plugin</artifactId>
>      <version>1.1.3</version>
>      <executions>
>          <execution>
>              <phase>generate-sources</phase>
>              <goals>
>                  <goal>process</goal>
>              </goals>
>              <configuration>
>                  <outputDirectory>target/generated-sources/java</outputDirectory>      
> 
>                      <processor>com.querydsl.apt.jpa.JPAAnnotationProcessor</processor>
>              </configuration>
>           </execution>
>      </executions> 
></plugin>

I also use mapstruct and lombok if maybe it is related (but I don't think) because the apt-maven-plugin runs before them.

ANSWER

Answered 2021-Dec-20 at 18:58

It appears you're still (perhaps transitively) relying on some Querydsl 4.0.0 dependencies. You need to remove those (I can't point out which ones, because you didn't include the full POM in your snippet).

I also recommend getting rid of the plugin altogether and instead using the dependency classifier:

 <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>

Source https://stackoverflow.com/questions/70390931

QUESTION

what is the problem with my rust diesel pagination code

Asked 2021-Dec-17 at 19:24

I want to do a pagination query when using rust diesel diesel = { version = "1.4.7", features = ["postgres","32-column-tables"] } , this is my pagination code:

use diesel::prelude::*;
use diesel::query_dsl::methods::LoadQuery;
use diesel::query_builder::{QueryFragment, Query, AstPass};
use diesel::pg::Pg;
use diesel::sql_types::BigInt;
use diesel::QueryId;

pub trait PaginateForQueryFragment: Sized {
    fn paginate(self, page: i64) -> Paginated<Self>;
}

impl<T> PaginateForQueryFragment for T
    where T: QueryFragment<Pg>{
    fn paginate(self, page: i64) -> Paginated<Self> {
        Paginated {
            query: self,
            per_page: 10,
            page,
            is_sub_query: true,
        }
    }
}

#[derive(Debug, Clone, Copy, QueryId)]
pub struct Paginated<T> {
    query: T,
    page: i64,
    per_page: i64,
    is_sub_query: bool
}

impl<T> Paginated<T> {
    pub fn per_page(self, per_page: i64) -> Self {
        Paginated { per_page, ..self }
    }

    
    pub fn load_and_count_pages<U>(self, conn: &PgConnection) -> QueryResult<(Vec<U>, i64)>
        where
            Self: LoadQuery<PgConnection, (U, i64)>,
    {
        let per_page = self.per_page;
        let results = self.load::<(U, i64)>(conn)?;
        let total = results.get(0).map(|x| x.1).unwrap_or(0);
        let records = results.into_iter().map(|x| x.0).collect();
        let total_pages = (total as f64 / per_page as f64).ceil() as i64;
        Ok((records, total_pages))
    }
}

impl<T: Query> Query for Paginated<T> {
    type SqlType = (T::SqlType, BigInt);
}

impl<T> RunQueryDsl<PgConnection> for Paginated<T> {}


impl<T> QueryFragment<Pg> for Paginated<T>
    where
        T: QueryFragment<Pg>,
{
    fn walk_ast(&self, mut out: AstPass<Pg>) -> QueryResult<()> {
        out.push_sql("SELECT *, COUNT(*) OVER () FROM ");
        if self.is_sub_query {
            out.push_sql("(");
        }
        self.query.walk_ast(out.reborrow())?;
        if self.is_sub_query {
            out.push_sql(")");
        }
        out.push_sql(" t LIMIT ");
        out.push_bind_param::<BigInt, _>(&self.per_page)?;
        out.push_sql(" OFFSET ");
        let offset = (self.page - 1) * self.per_page;
        out.push_bind_param::<BigInt, _>(&offset)?;
        Ok(())
    }
}


#[derive(Debug, Clone, Copy, QueryId)]
pub struct QuerySourceToQueryFragment<T> {
    query_source: T,
}

impl<FC, T> QueryFragment<Pg> for QuerySourceToQueryFragment<T>
    where
        FC: QueryFragment<Pg>,
        T: QuerySource<FromClause=FC>,
{
    fn walk_ast(&self, mut out: AstPass<Pg>) -> QueryResult<()> {
        self.query_source.from_clause().walk_ast(out.reborrow())?;
        Ok(())
    }
}

pub trait PaginateForQuerySource: Sized {
    fn paginate(self, page: i64) -> Paginated<QuerySourceToQueryFragment<Self>>;
}

impl<T> PaginateForQuerySource for T
    where T: QuerySource {
    fn paginate(self, page: i64) -> Paginated<QuerySourceToQueryFragment<Self>> {
        Paginated {
            query: QuerySourceToQueryFragment {query_source: self},
            per_page: 10,
            page,
            is_sub_query: false, 
        }
    }
}

then I do the pagination query in a unit test like this way:

#[cfg(test)]
mod test {

    use std::env;
    use diesel::{Connection, ExpressionMethods, PgConnection, QueryDsl, RunQueryDsl};
    use rust_wheel::common::query::pagination::PaginateForQuerySource;
    use crate::model::diesel::rhythm::rhythm_schema::favorites::dsl::favorites;
    use crate::model::diesel::rhythm::rhythm_schema::favorites::like_status;
    use crate::models::Favorites;

    #[test]
    fn page_test(){
        use crate::model::diesel::rhythm::rhythm_schema::favorites::dsl::*;
        use rust_wheel::common::query::pagination::{PaginateForQueryFragment, PaginateForQuerySource};
        let conn = establish_music_connection();
        let query = favorites
            .filter(like_status.eq(1))
            .paginate(1)
            .per_page(10)
            .load::<Favorites>(&conn)
            .expect("query fav failed");

        println!("{:?}", 1);
    }

    pub fn establish_music_connection() -> PgConnection {
        let database_url = std::env::var("MUSIC_DATABASE_URL").expect("MUSIC_DATABASE_URL must be set");
        PgConnection::establish(&database_url).expect(&format!("Error connecting to {}", database_url))
    }
}

shows error like this:

error[E0277]: the trait bound `(i64, std::option::Option<i64>, i64, i64, i64, std::string::String, i32, i32, i64, i32, std::option::Option<i32>, std::option::Option<i32>): Queryable<((BigInt, diesel::sql_types::Nullable<BigInt>, BigInt, BigInt, BigInt, Text, Integer, Integer, BigInt, Integer, diesel::sql_types::Nullable<Integer>, diesel::sql_types::Nullable<Integer>), BigInt), Pg>` is not satisfied
    --> src/test/app/music/fav/fav_music.rs:21:14
     |
21   |             .load::<Favorites>(&conn)
     |              ^^^^ the trait `Queryable<((BigInt, diesel::sql_types::Nullable<BigInt>, BigInt, BigInt, BigInt, Text, Integer, Integer, BigInt, Integer, diesel::sql_types::Nullable<Integer>, diesel::sql_types::Nullable<Integer>), BigInt), Pg>` is not implemented for `(i64, std::option::Option<i64>, i64, i64, i64, std::string::String, i32, i32, i64, i32, std::option::Option<i32>, std::option::Option<i32>)`
     |
     = help: the following implementations were found:
               <(A, B, C, D, E, F, G, H, I, J, K, L) as Queryable<(SA, SB, SC, SD, SE, SF, SG, SH, SI, SJ, SK, SL), __DB>>
               <(A, B, C, D, E, F, G, H, I, J, K, L) as Queryable<diesel::sql_types::Record<(SA, SB, SC, SD, SE, SF, SG, SH, SI, SJ, SK, SL)>, Pg>>
note: required because of the requirements on the impl of `Queryable<((BigInt, diesel::sql_types::Nullable<BigInt>, BigInt, BigInt, BigInt, Text, Integer, Integer, BigInt, Integer, diesel::sql_types::Nullable<Integer>, diesel::sql_types::Nullable<Integer>), BigInt), Pg>` for `Favorites`
    --> src/models.rs:14:22
     |
14   | #[derive( Serialize, Queryable, Deserialize,Default)]
     |                      ^^^^^^^^^
15   | // #[table_name = "favorites"]
16   | pub struct Favorites {
     |            ^^^^^^^^^
     = note: required because of the requirements on the impl of `LoadQuery<PgConnection, Favorites>` for `Paginated<diesel::query_builder::SelectStatement<rhythm_schema::favorites::table, query_builder::select_clause::DefaultSelectClause, query_builder::distinct_clause::NoDistinctClause, query_builder::where_clause::WhereClause<diesel::expression::operators::Eq<rhythm_schema::favorites::columns::like_status, diesel::expression::bound::Bound<Integer, i32>>>>>`
note: required by a bound in `load`
    --> /Users/dolphin/.cargo/registry/src/github.com-1ecc6299db9ec823/diesel-1.4.8/src/query_dsl/mod.rs:1238:15
     |
1238 |         Self: LoadQuery<Conn, U>,
     |               ^^^^^^^^^^^^^^^^^^ required by this bound in `load`
     = note: this error originates in the derive macro `Queryable` (in Nightly builds, run with -Z macro-backtrace for more info)

when I remove the pagination lines in the unit test code, it works fine. Could query data from database successfully. So I think something is going wrong with my pagination code. I read the code but could not figure out where is going wrong, what should I do to fix this problem? This is my Favorites define:

#[derive( Serialize, Queryable, Deserialize,Default)]
// #[table_name = "favorites"]
pub struct Favorites {
    pub id: i64,
    pub song_id: Option<i64>,
    pub created_time: i64,
    pub updated_time: i64,
    pub user_id: i64,
    pub source_id: String,
    pub like_status: i32,
    pub source: i32,
    pub playlist_id: i64,
    pub play_count: i32,
    pub fetched_download_url: Option<i32>,
    pub downloaded: Option<i32>
}

and this is the table DDL in the PostgreSQL 13:

-- Drop table

-- DROP TABLE public.favorites;

CREATE TABLE public.favorites (
    id int8 NOT NULL GENERATED ALWAYS AS IDENTITY,
    song_id int8 NULL,
    created_time int8 NOT NULL,
    updated_time int8 NOT NULL,
    user_id int8 NOT NULL,
    source_id varchar NOT NULL,
    like_status int4 NOT NULL,
    "source" int4 NOT NULL,
    playlist_id int8 NOT NULL,
    play_count int4 NOT NULL DEFAULT 1,
    fetched_download_url int4 NULL DEFAULT 0,
    downloaded int4 NULL DEFAULT 0,
    CONSTRAINT favorites_id_seq_pk PRIMARY KEY (id),
    CONSTRAINT unique_idx UNIQUE (source_id, user_id)
);
CREATE UNIQUE INDEX fav_uniq_idx ON public.favorites USING btree (source_id, user_id);

ANSWER

Answered 2021-Dec-17 at 19:24

The pagination code transforms your query from one returning Favorites to one returning (Favorites, i64). It adds a column via SELECT *, COUNT(*) to keep track of total counts.

You should either use the provided .load_and_count_pages() instead of .load() or you can probably get just the original columns by using a .select(). The code could possibly be modified to avoid adding the column if you don't need the counts and only need limit and offset.

Source https://stackoverflow.com/questions/70392149

QUESTION

error: cannot find attribute `table_name` in this scope

Asked 2021-Dec-17 at 08:18

I want to do a page query using rust diesel, I am using this code to do a unit test in rust:

#[cfg(test)]
mod test {

    use std::env;
    use diesel::{Connection, ExpressionMethods, PgConnection, QueryDsl, RunQueryDsl};
    use rust_wheel::common::query::pagination::PaginateForQuerySource;
    use crate::model::diesel::rhythm::rhythm_schema::favorites::dsl::favorites;
    use crate::model::diesel::rhythm::rhythm_schema::favorites::like_status;
    use crate::models::Favorites;

    #[test]
    fn page_test(){
        use crate::model::diesel::rhythm::rhythm_schema::favorites::dsl::*;
        use rust_wheel::common::query::pagination::{PaginateForQueryFragment, PaginateForQuerySource};
        let conn = establish_music_connection();
        let query = favorites
            .filter(like_status.eq(1))
            .paginate(1)
            .per_page(10)
            .load::<Favorites>(&conn)
            .expect("query fav failed");

        println!("{:?}", 1);
    }

    pub fn establish_music_connection() -> PgConnection {
        let database_url = std::env::var("MUSIC_DATABASE_URL").expect("MUSIC_DATABASE_URL must be set");
        PgConnection::establish(&database_url).expect(&format!("Error connecting to {}", database_url))
    }
}

shows error like this:

error: cannot find attribute `table_name` in this scope
  --> src/models.rs:15:3
   |
15 | #[table_name = "favorites"]
   |   ^^^^^^^^^^

this is my models.rs define, this two models are store in different database:

use rocket::serde::Serialize;
use serde::Deserialize;
use crate::model::diesel::dolphin::dolphin_schema::dashboard;
use crate::model::diesel::rhythm::rhythm_schema::favorites;

#[derive(Insertable, Serialize, Queryable, Deserialize,Default)]
#[table_name = "dashboard"]
pub struct Dashboard {
    pub id: i32,
    pub app_count: i32,
    pub user_count: i32
}

#[derive(Serialize, Queryable, Deserialize,Default)]
#[table_name = "favorites"]
pub struct Favorites {
    pub id: i64,
    pub song_id: String,
    pub created_time: i64
}

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

ANSWER

Answered 2021-Dec-17 at 08:18

Only the Insertable derive macro handles the #[table_name = ...] attribute. So it should not be included if you're not using it.

Source https://stackoverflow.com/questions/70388869

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

Vulnerabilities

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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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