GitHub - FranFranRobles/querybuilder: SQL query builder, written in c#, helps you build complex queries easily, supports SqlServer, MySql, PostgreSql, Oracle, Sqlite and Firebird

SqlKata Query Builder

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SqlKata Query Builder is a powerful Sql Query Builder written in C#.

It's secure and framework agnostic. Inspired by the top Query Builders available, like Laravel Query Builder, and Knex.

SqlKata has an expressive API. it follows a clean naming convention, which is very similar to the SQL syntax.

By providing a level of abstraction over the supported database engines, that allows you to work with multiple databases with the same unified API.

SqlKata supports complex queries, such as nested conditions, selection from SubQuery, filtering over SubQueries, Conditional Statements and others. Currently it has built-in compilers for SqlServer, MySql, PostgreSql and Firebird.

Checkout the full documentation on https://sqlkata.com

Installation

using dotnet cli

$ dotnet add package SqlKata

using Nuget Package Manager

PM> Install-Package SqlKata

Quick Examples

Setup Connection

SqlConnection connection = new SqlConnection("...");
SqlCompiler compiler = new SqlCompiler();
QueryFactory db = new QueryFactory(connection, compiler);

Retrieve all records

var books = db.Query("Books").Get();

Retrieve published books only

IEnumerable<dynamic> books = db.Query("Books").WhereTrue("IsPublished").Get();

Retrieve one book

IEnumerable<dynamic> introToSql = db.Query("Books").Where("Id", 145).Where("Lang", "en").First();

Retrieve recent books: last 10

IEnumerable<dynamic> recent = db.Query("Books").OrderByDesc("PublishedAt").Limit(10).Get();

Include Author information

IEnumerable<dynamic> books = db.Query("Books")
    .Include(db.Query("Authors")) // Assumes that the Books table have a `AuthorId` column
    .Get();

This will include the property "Author" on each "Book"

[{
    "Id": 1,
    "PublishedAt": "2019-01-01",
    "AuthorId": 2
    "Author": { // <-- included property
        "Id": 2,
        "...": ""
    }
}]

Join with authors table

IEnumerable<dynamic> books = db.Query("Books")
    .Join("Authors", "Authors.Id", "Books.AuthorId")
    .Select("Books.*", "Authors.Name as AuthorName")
    .Get();

foreach(var book in books)
{
    Console.WriteLine($"{book.Title}: {book.AuthorName}");
}

Conditional queries

var isFriday = DateTime.Today.DayOfWeek == DayOfWeek.Friday;

var books = db.Query("Books")
    .When(isFriday, q => q.WhereIn("Category", new [] {"OpenSource", "MachineLearning"}))
    .Get();

Pagination

PaginationResult<dynamic>  page1 = db.Query("Books").Paginate(10);

foreach(var book in page1.List)
{
    Console.WriteLine(book.Name);
}

...

PaginationResult<dynamic> page2 = page1.Next();

Insert

int affected = db.Query("Users").Insert(new {
    Name = "Jane",
    CountryId = 1
});

Update

int affected = db.Query("Users").Where("Id", 1).Update(new {
    Name = "Jane",
    CountryId = 1
});

Delete

int affected = db.Query("Users").Where("Id", 1).Delete();