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EF Core JSON column sample (#341)
* README update for JSON column sample * Create json-columns sample * Rename json-columns to json-columns.cs Added file extension. * Rename samples/ef-core/json-columns.cs to samples/ef-core/json/json-columns.cs
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‎samples/README.md

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* Autonomous Database Sample: Demonstrates Oracle EF Core connecting to Oracle Autonomous Database. <br>
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* Dependency Injection Sample: Demonstrates using dependency injection and ASP.NET Core with Oracle EF Core. <br>
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* Getting Started Sample: Demonstrates a basic Oracle EF Core scenario using migrations and scaffolding. <br>
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* JSON Columns Sample: Demonstrates how to create an owned entity, insert, queriy, updates and delete JSON column data. <br>
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* Keyless Entity Types Sample: Demonstrates Oracle EF Core keyless entity types with relational and materialized views. <br>
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* Stored Procedure Result Set Samples: Demonstrates using PL/SQL that returns either an explicitly or implicitly bound REF Cursor.
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‎samples/ef-core/json/json-columns.cs

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//This sample shows how to use EF Core JSON columns with ODP.NET and Oracle Database.
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//It creates an owned entity, inserts, queries, updates, and deletes JSON column data.
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//It requires Oracle EF Core 8 or higher. Oracle Database 21c and higher supports JSON columns.
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//Earlier database versions map aggregate types to NCLOB columns instead of JSON columns.
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//Specify the user, password, and data source in the connection string below.
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using Microsoft.EntityFrameworkCore;
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namespace ODPJsonColumns
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{
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class Program
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{
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public class ContactDetails
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{
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public Address Address { get; set; } = null!;
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public string? Phone { get; set; }
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}
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public class Address
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{
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public Address(string street, string city, string postcode, string country)
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{
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Street = street;
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City = city;
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Postcode = postcode;
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Country = country;
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}
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public string Street { get; set; }
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public string City { get; set; }
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public string Postcode { get; set; }
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public string Country { get; set; }
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}
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public class Author
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{
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public int Id { get; set; }
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public string? Name { get; set; }
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public ContactDetails? Contact { get; set; }
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}
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public class AuthorContext : DbContext
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{
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public DbSet<Author> Authors { get; set; }
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//To use Oracle database JSON columns, connect to Oracle Database 21c or higher version and
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// specify OracleSQLCompatibility to DatabaseVersion21 or higher.
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protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
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{
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optionsBuilder.UseOracle("User Id=<USER>; Password=<PASSWORD>; Data Source=<DATA SOURCE>"
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, b => b.UseOracleSQLCompatibility(OracleSQLCompatibility.DatabaseVersion21)); ;
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}
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protected override void OnModelCreating(ModelBuilder modelBuilder)
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{
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// Configuring the Contact column as a JSON column
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modelBuilder.Entity<Author>().OwnsOne(
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author => author.Contact, ownedNavigationBuilder =>
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{
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ownedNavigationBuilder.ToJson();
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ownedNavigationBuilder.OwnsOne(contactDetails => contactDetails.Address);
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});
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}
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}
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public static void Main()
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{
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using (var context = new AuthorContext())
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{
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context.Database.EnsureDeleted();
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context.Database.EnsureCreated();
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var author1 = new Author()
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{
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Name = "John Smith",
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Contact = new ContactDetails()
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{
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Phone = "555 123 4567",
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Address = new Address("1 Any Street", "Austin", "78741", "US")
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}
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};
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var author2 = new Author()
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{
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Name = "Kim Jones",
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Contact = new ContactDetails()
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{
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Phone = "555 234 5678",
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Address = new Address("2 Any Street", "Redwood Shores", "94065", "US")
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}
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};
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/*
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* Contact inserted into the JSON column as the following example:
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*
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* {
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* "Phone": "555 123 4567",
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* "Address": {
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* "City": "Austin",
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* "Country": "US",
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* "Postcode": "78741",
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* "Street": "1 Any Street"
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* }
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* }
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*/
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// Insert data
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Console.WriteLine("Inserting authors into table\n");
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context.Authors.Add(author1);
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context.Authors.Add(author2);
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context.SaveChanges();
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// Query to verify insert
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Console.WriteLine("Authors in table: ");
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var result = context.Authors.ToList();
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foreach (var author in result)
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{
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Console.WriteLine($"{author.Name}");
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}
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Console.WriteLine();
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// Query using owned entity details from JSON column
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var result1 = context.Authors.Where(author => author.Contact.Address.City == "Austin").First();
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Console.WriteLine($"Author residing in Austin: {result1.Name}\n");
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// Update second author's phone number details
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Console.WriteLine("Updating second author's phone number");
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author2.Contact.Phone = "123 456 7890";
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context.SaveChanges();
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// Query to verify update
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var result2 = context.Authors.Where(author => author.Name == "Kim Jones").First();
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Console.WriteLine($"Retrieve author's new phone number {result2.Name}: {result2.Contact.Phone}\n");
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// Delete second author
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Console.WriteLine("Deleting author with street address '2 Any Street' from table");
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context.Remove(context.Authors.Single(author => author.Contact.Address.Street == "2 Any Street"));
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context.SaveChanges();
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Console.WriteLine("Delete complete.\n");
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// Query to verify delete
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Console.WriteLine("Authors remaining in table: ");
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var result3 = context.Authors.ToList();
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foreach(var author in result3)
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{
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Console.WriteLine($"{author.Name}");
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}
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}
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}
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}
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}
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/* Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved. */
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/******************************************************************************
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*
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* You may not use the identified files except in compliance with The MIT
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* License (the "License.")
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*
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* You may obtain a copy of the License at
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* https://github.com/oracle/dotnet-db-samples/blob/master/LICENSE.txt
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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*
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*****************************************************************************/

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