QuerySpecification | Abstract package for building query specifications | Functional Programming library

by fiseni C# Version: efcore-5.0.4 License: MIT

X-Ray Key Features Code Snippets(3)Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | QuerySpecification Summary

QuerySpecification is a C# library typically used in Programming Style, Functional Programming applications. QuerySpecification has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

Specification pattern in general is a way of combining and encapsulating set of business rules. Once you create them, you can test if domain objects satisfy these defined rules or not. Historically, the initiative had nothing to do with DB related queries or anything with persistence, but more with customizable business logic, which (in theory) would be easily maintainable.

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Quality

Security

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Support

QuerySpecification has a low active ecosystem.

It has 15 star(s) with 0 fork(s). There are 2 watchers for this library.

It had no major release in the last 12 months.

There are 1 open issues and 7 have been closed. On average issues are closed in 1 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of QuerySpecification is efcore-5.0.4

Quality

QuerySpecification has no bugs reported.

Security

QuerySpecification has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

QuerySpecification is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

QuerySpecification releases are available to install and integrate.

Installation instructions are not available. Examples and code snippets are available.

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QuerySpecification Key Features

No Key Features are available at this moment for QuerySpecification.

QuerySpecification Examples and Code Snippets

PozitronDev.QuerySpecification,Usage,Base Repository

Lines of Code : 31

License : Permissive (MIT)

Copy

public class Repository : RepositoryBase, IRepository
{
    private readonly MyDbContext myDbContext;

    public Repository(MyDbContext myDbContext)
        : base(myDbContext)
    {
        this.myDbContext = myDbContext;
    }

    // Not required

PozitronDev.QuerySpecification,Usage

Lines of Code : 26

License : Permissive (MIT)

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public MyCompanySpec(int countryId)
{
    // It's possible to chain everything, or write them separately. 
    // It's based on your preference
    Query.Where(x => x.CountryId == countryId)
         .Skip(10)
	 .Take(20)
         .OrderBy(x =>

PozitronDev.QuerySpecification,Usage,Search feature

Lines of Code : 22

License : Permissive (MIT)

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public class CustomerSpec : Specification
{
    public CustomerSpec(string searchTerm)
    {
        Query.Search(x => x.Name, searchTerm)
             .Search(x => x.Address, searchTerm);
    }
}

dbContext.Customers.Where(x => EF.Functions

Community Discussions

Trending Discussions on QuerySpecification

HSQL Java Language Routines cause "General Error" (S1000) when called

Error when trying to join a table and a stream

"Incompatible data type in operation" Error when trying to format datetime

HSQLDB org.springframework.dao.TransientDataAccessResourceException on complex select

HSQLDB ANY array function not working

Spring Boot Dynamic Querying With Spring Data Rest

Select 100+ millions of rows in HSQLDB

Getting information about which column belongs to which table using TSql120Parser

DacFX: Ignore non Columns in a ColumnReferenceExpression visitor

Executing multiline query does not work with table alias where single-line query does

QUESTION

HSQL Java Language Routines cause "General Error" (S1000) when called

Asked 2021-Mar-05 at 22:23

I am trying to migrate an old application from HSQLDB 1.8.0.10 to the latest version 2.5.1.

Everything has been going fine, but the old application added two ALIASs for static Java methods:

...

ANSWER

Answered 2021-Mar-05 at 17:54

I found a workaround:

When preparing a statement that has a ? placeholder as a function argument, the HSQLDB connector attempts to resolve the type of the ? placeholder, which fails.

A workaround is to replace the ? placeholder manually, before preparing the statement. Not very clean, but at least it works.

Source https://stackoverflow.com/questions/66492155

QUESTION

Error when trying to join a table and a stream

Asked 2020-May-13 at 16:12

I am trying to join a table and a stream and create another table as shown below:

...

ANSWER

Answered 2018-Feb-12 at 21:52

The JOIN criteria should only be key equality. If you have any other criteria you need to put them in the WHERE clause. Try the following:

Source https://stackoverflow.com/questions/48741771

QUESTION

"Incompatible data type in operation" Error when trying to format datetime

Asked 2019-Aug-29 at 09:21

In ODI, I am fetching a field [datetime] from a table which is in MS SQL server. The datetime from MS SQL is in this format: 2019-06-26 07:41:00.000.

I need to convert it to this format: 26-06-2019 10:41:00 i.e DD-MM-YYYY HH:MI:SS with hour incremented by 3, before writing it to a JSON file.

The corresponding field in JSON is VARCHAR(string).

But I am getting error: Caused By: java.sql.SQLSyntaxErrorException: incompatible data type in operation

I gave the following expressing in the ODI 12c mapping attribute expression editor:

...

ANSWER

Answered 2019-Aug-29 at 09:21

As the target is a file, it is not an Oracle database doing the transformation but the internal HSQL database of ODI Studio or the ODI agent. The Oracle functions can not be used here but it can be replaced by HSQL functions. Here are the available functions : http://hsqldb.org/doc/guide/builtinfunctions-chapt.html.

Alternatively an expression could be added to the mapping right after the L_MAILITM_EVENTS datastore to do the transformation on the source database using MS SQL specific functions. This would change the SELECT statement executed on MS SQL to directly apply the functions. Make sure to change the execution location of the expression to the source.

Source https://stackoverflow.com/questions/57704799

QUESTION

HSQLDB org.springframework.dao.TransientDataAccessResourceException on complex select

Asked 2018-Nov-06 at 23:14

I have a query that runs fine in Oracle, but I receive a org.springframework.dao.TransientDataAccessResourceException when attempting to run the same query in HSQLDB (using the Oracle compatibility mode).

Here is the query in question:

...

ANSWER

Answered 2018-Nov-06 at 23:14

This is a limitation of HSQLDB. You can try CASE Order.status WHEN 'C' THEN Orderlines.qty ELSE 0 END instead and see if it works.

Source https://stackoverflow.com/questions/53180783

QUESTION

HSQLDB ANY array function not working

Asked 2018-Jun-04 at 15:32

I have a table like this

...

ANSWER

Answered 2018-Jun-04 at 15:32

With HSQLDB you need to use

Source https://stackoverflow.com/questions/50665451

QUESTION

Spring Boot Dynamic Querying With Spring Data Rest

Asked 2018-May-27 at 10:00

I am trying to do something a little interesting where I want to be able to dynamically build sql query filters using Spring Boot 1.5.9 and Spring Data Rest without needing to write a controller. I feel like I might be on the right path, but I am kinda stuck.

The idea is to intercept an HTTP Request GET method by using HandlerInterceptorAdapter and store the Request query parameters into an object that can be used by the PagingAndSortingRepository. The plan is to override findAll(Pageable p) that Spring Data Rest uses by default, to call findAll(Specification s, Pageable p) to allow dynamic filtering.

I have used Request Scope provided by Spring to save the query parameters to allow me to use them throughout the life cycle of the Request.

The problem is that I cannot access the QueryParam object from the Repository interface file. I tried to use dependency injection into the interface file, by following this stackoverflow solution, but it does not work: Spring Dependency injection for interfaces

Spring Data Rest tries to create an endpoint by trying to build a SQL query based on the function name. Even when I tried to get around this issue by trying to trick Spring Data by creating a function that it can query with then overriding it with SampleRepositoryComponents that I implemented below, I cannot get the data stored in QueryParam.

Someone else also made a pull request to allow Spring Data Rest to ignore certain methods: https://github.com/spring-projects/spring-data-rest/pull/286

QueryParam:

...

ANSWER

Answered 2018-May-27 at 10:00

The same is already implemented 'from the box' in Spring Data REST with help of Querydsl and Web support Spring Data extensions.

Just extend you repos from QuerydslPredicateExecutor (and optionally QuerydslBinderCustomizer with default implementation of the customize method like in the example here), then you can query your repo data with filtering (more other - with paging and sorting support):

Source https://stackoverflow.com/questions/48473289

QUESTION

Select 100+ millions of rows in HSQLDB

Asked 2017-Oct-31 at 14:30

I have to iterate through a table with 100+ millions of records with JDBC on a HSQLDB database and I don't manage to do it in a reasonable time. I use hsqldb v2.4.0.

I tried to use a PreparedStatement with the following query to slice the data:

...

ANSWER

Answered 2017-Oct-31 at 14:30

This issue is not related to memory use, as not too much memory is used for this type of SELECT.

The increase in time to select the result is expected. The OFFSET clause in the SELECT indicates how many rows are skipped. As it gets larger, more rows are selected and skipped.

You need to modify your SELECT to:

Source https://stackoverflow.com/questions/47032173

QUESTION

Getting information about which column belongs to which table using TSql120Parser

Asked 2017-Oct-06 at 08:56

I am building a SQL query parser using TSql120Parser (Microsoft.SqlServer.TransactSql.ScriptDom) and as mechanics are fairly simple, break query into batches and getting information from proper statements.

I have a problem how to join columns from select statement to tables from select statement, lets use simple query:

...

ANSWER

Answered 2017-Oct-06 at 08:56

As the Damien_The_Unbeliever mentioned:

Blockquote When the column names aren't prefixed by a table name or alias, you (and indeed SQL Server) cannot determine this information purely from parsing. You need to query the database metadata to determine which of the tables in scope within the query contains a column with the given name (and to raise an error if multiple tables contain columns with the same name)

Source https://stackoverflow.com/questions/46151467

QUESTION

DacFX: Ignore non Columns in a ColumnReferenceExpression visitor

Asked 2017-May-19 at 14:38

When using a visitor scanning for ColumnReferenceExpression's in a TSqlFragment there are some things that get picked up as columns that truly are not. For example in this sql:

...

ANSWER

Answered 2017-May-19 at 14:38

The dd is a column reference as you are getting all the ColumnReferences in the tree - the script dom doesn't know what dateadd is, it just knows that it is a function and so dd could very well be a column.

If it was me I would get the select statement, get the SelectElements and iterate through them (if you have correlated subqueries for example, by using the Select visitor you should still get all of those) and in this case ignore anything that isn't a ColumnReference.

Doing it manually (rather than linq) so it is a bit clearer it would be something like:

Source https://stackoverflow.com/questions/44071396

QUESTION

Executing multiline query does not work with table alias where single-line query does

Asked 2017-Jan-25 at 22:14

This is my first time using ucanaccess since I just found out that my previous version of Eclipse would not work with Java 1.8 so I can get to my Access DB. I am familiar with Java programming and RDBMS (currently use Oracle) so I don't understand why I'm getting an error with my code.

This is the code I use to connect to the DB (variable dbFile is a File object used to store the Access DB path):

...

ANSWER

Answered 2017-Jan-25 at 22:14

The link I regularly give is valid here too:
How to debug dynamic SQL in VBA

You are concatenating a SQL string without checking it is correct.

Source https://stackoverflow.com/questions/41861718

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

Vulnerabilities

No vulnerabilities reported

Install QuerySpecification

You can download it from GitHub.

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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