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  • YUGABYTEDB CORE
    • Quick start
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    • Deploy
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  • YUGABYTE PLATFORM
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      • Prerequisites
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  • YUGABYTE CLOUD
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  • INTEGRATIONS
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    • Entity Framework
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  • REFERENCE
    • Architecture
      • Design goals
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      • Layered architecture
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    • APIs
      • YSQL
        • The SQL language
          • SQL statements
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            • ALTER TABLE
            • ALTER USER
            • ANALYZE
            • BEGIN
            • CALL
            • COMMENT
            • COMMIT
            • COPY
            • CREATE AGGREGATE
            • CREATE CAST
            • CREATE DATABASE
            • CREATE DOMAIN
            • CREATE EXTENSION
            • CREATE FUNCTION
            • CREATE GROUP
            • CREATE INDEX
            • CREATE MATERIALIZED VIEW
            • CREATE OPERATOR
            • CREATE OPERATOR CLASS
            • CREATE POLICY
            • CREATE PROCEDURE
            • CREATE ROLE
            • CREATE RULE
            • CREATE SCHEMA
            • CREATE SEQUENCE
            • CREATE TABLE
            • CREATE TABLE AS
            • CREATE TRIGGER
            • CREATE TYPE
            • CREATE USER
            • CREATE VIEW
            • DEALLOCATE
            • DELETE
            • DO
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            • EXECUTE
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              • graph representation
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              • directed cyclic graph
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            • case study—Bacon Numbers from IMDb
              • Bacon numbers for synthetic data
              • Bacon numbers for IMDb data
        • Data types
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            • array[] constructor
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                • Synthetic timezones no DST
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                • Timestamptz to/from timestamp conversion
                • Pure 'day' interval arithmetic
              • Four ways to specify offset
                • Name-resolution rules
                  • 1 case-insensitive resolution
                  • 2 ~names.abbrev never searched
                  • 3 'set timezone' string not resolved in ~abbrevs.abbrev
                  • 4 ~abbrevs.abbrev before ~names.name
                  • Helper functions
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                • Function extract() | date_part()
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            • ToC
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            • JSON literals
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              • ::jsonb, ::json, ::text (typecast)
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              • array_to_json()
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            • case study—percentile_cont() and the "68–95–99.7" rule
            • case study—linear regression on COVID data
              • Download the COVIDcast data
              • Ingest the COVIDcast data
                • Inspect the COVIDcast data
                • Copy the .csv files to staging tables
                • Check staged data conforms to the rules
                • Join the staged data into a single table
                • SQL scripts
                  • Create cr_staging_tables()
                  • Create cr_copy_from_scripts()
                  • Create assert_assumptions_ok()
                  • Create xform_to_covidcast_fb_survey_results()
                  • ingest-the-data.sql
              • Analyze the COVIDcast data
                • symptoms vs mask-wearing by day
                • Data for scatter-plot for 21-Oct-2020
                • Scatter-plot for 21-Oct-2020
                • SQL scripts
                  • analysis-queries.sql
                  • synthetic-data.sql
          • currval()
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              • lag(), lead()
              • Tables for the code examples
                • table t1
                • table t2
                • table t3
                • table t4
            • case study—analyzing a normal distribution
              • Bucket allocation scheme
              • do_clean_start.sql
              • cr_show_t4.sql
              • cr_dp_views.sql
              • cr_int_views.sql
              • cr_pr_cd_equality_report.sql
              • cr_bucket_using_width_bucket.sql
              • cr_bucket_dedicated_code.sql
              • do_assert_bucket_ok
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              • cr_do_percent_rank.sql
              • cr_do_cume_dist.sql
              • do_populate_results.sql
              • do_report_results.sql
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              • Reports
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  • RELEASES
    • Releases overview
      • v2.13 series (latest)
      • v2.12 series (stable)
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>

Entity Framework

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  • Prerequisites
  • Use Entity Framework

This document describes how to use Entity Framework Core, an ORM library for C# with YugabyteDB.

Prerequisites

Before you start using Entity framework:

  • Install YugabyteDB 2.6 or later and start a single node local cluster. Refer YugabyteDB Quick Start Guide to install and start a local cluster.

  • Install .NET Core SDK 6.0 or later.

Use Entity Framework

You can start using Entity Framework with YugabyteDB as follows:

  • Create a new dotnet project with the command:
dotnet new console -o EFGetStarted && cd EFGetStarted
  • Install Entity Framework Core by installing the package for the database provider(s) you want to target. In this case, it is Entity Framework PostgreSQL.
dotnet add package Npgsql.EntityFrameworkCore.PostgreSQL
  • Create a model from the existing database in a Model.cs file using an editor and add the following code:
using System.Collections.Generic;
using Microsoft.EntityFrameworkCore;

namespace ConsoleApp.PostgreSQL
{
    public class BloggingContext : DbContext
    {
        public DbSet<Blog> Blogs { get; set; }
        public DbSet<Post> Posts { get; set; }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
            => optionsBuilder.UseNpgsql("Host=localhost;Port=5433;Database=yugabyte;Username=yugabyte;Password=yugabyte");
    }

    public class Blog
    {
        public int BlogId { get; set; }
        public string Url { get; set; }
        public List<Post> Posts { get; set; }
    }

    public class Post
    {
        public int PostId { get; set; }
        public string Title { get; set; }
        public string Content { get; set; }

        public int BlogId { get; set; }
        public Blog Blog { get; set; }
    }
}

Configure the database properties accordingly. The default user and password for YugabyteDB is yugabyte, and the default port is 5433.

  • Use EF Migrations to create a database from the model.
dotnet tool install --global dotnet-ef
dotnet add package Microsoft.EntityFrameworkCore.Design --version 6.0.0 //Mention the .NET Core SDK version you installed above.
dotnet ef migrations add InitialCreate
dotnet ef database update
  • Perform the CRUD operations after the database is created. Replace the code in Program.cs file under the EFGetStarted project with the following:
using System;
using System.Linq;

namespace ConsoleApp.PostgreSQL
{
    internal class Program
    {
        private static void Main()
        {
            using (var db = new BloggingContext())
            {
                // Note: This sample requires the database to be created before running.
                // Console.WriteLine($"Database path: {db.DbPath}.");

                // Create
                Console.WriteLine("Inserting a new blog");
                db.Add(new Blog { Url = "http://blogs.abc.com/adonet" });
                db.SaveChanges();

                // Read
                Console.WriteLine("Querying for a blog");
                var blog = db.Blogs
                    .OrderBy(b => b.BlogId)
                    .First();
                Console.WriteLine("ID :" + blog.BlogId + "\nURL:" + blog.Url);

                // Delete
                Console.WriteLine("Deleting the blog");
                db.Remove(blog);
                db.SaveChanges();
            }
        }
    }
}
  • Run the application and verify the results.
dotnet run
Inserting a new blog
Querying for a blog
ID :1
URL:http://blogs.abc.com/adonet
Deleting the blog
  • Prerequisites
  • Use Entity Framework
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