Introduction
The first example on using the Hana Generic Repository that is described
here and published on nuget.org
here
Pre-requirements
- SAP Cloud Platform Trial Account with Cloud Foundry Org and Hana as a Service instance or Hana Cloud instance
- HANA test container deployed containing test schema from here
- or any other Hana schema connection available
- Visual Studio Community and dotnetcore SDK 2.1
- Hana Client Install Windows (x86_64) zip file containing dotnetcore x64 driver from here
- dotnetcore driver installed after the clients file download
Create a new Project
- Create a new Project
- ASP NET Core Web Application with C#
- App name: WebApplication1
- Choose the right folder
- Solution name : WebApplication1
- Click Next button
- From templates list choose API
- Click Create button
Create new Controller
- On Controllers Folder, right click and choose Add -> Controller
- Choose API Controller Empty
- Click Add
- Enter new Controller Name : ModelController
- Click Add
- Delete the auto-generated controller (in my case it was WeatherForecastController.cs)
- Delete the WeatherForecast.cs model class also
- Build Solution
- Run on IIS Express
Add Reference to Nuget Package
- on WebApplication1 project right clieck and Choose Manage Nuget Packages
- on Browse tab of the opened window Search for HanaGenericRepository.dll
- Select and click Install button
- click OK button and the I Accept button for the licence
Add Reference to SAP HANA 2.0 dotnetcore x64 driver
- On Dependencies, under WebApplication1 project, right click and choose Add Reference
- In the new window click on the Browse button, found in the bottom, near the Ok/Cancel buttons
- Choose the path file where you installed the Hana Driver for dotnetcore, select the file
- click Add button
- Build the solution
- Select the driver dependency and choose to always Copy Local on build
Create New Model Class
Create a new project folder with name : Models
Create a new class with name : Model1.cs
Paste the code below in the new file
using HanaGenericRepository.Attributes;
using System;
namespace WebApplication1.Models
{
[HanaTableNamespace("testdb.database")]
[HanaTableContext("data")]
[HanaTableName("model1")]
public class Model1
{
[HanaId]
[HanaColumnName("id")]
public Guid Id { get; set; }
[HanaColumnName("name")]
public String Name { get; set; } = string.Empty;
[HanaColumnName("active")]
public bool Active { get; set; }
[HanaColumnName("value")]
public int IntValue { get; set; } = 0;
[HanaColumnName("datetime")]
public DateTime DateTimeValue { get; set; } = DateTime.MinValue;
[HanaColumnName("email")]
[HanaDatabaseEncodedValue("seed")]
public string Email { get; set; } = string.Empty;
public string NotMappedProperty { get; set; }
public double NotMappedProperty2 { get; set; }
}
}
How to create Database Connection Info Object
HanaConnectionInfo hanaConnInfo = new HanaConnectionInfo()
{
Tenant = "HXE",
UserName = "D118DA114BA14CA5AA1ECF261DBAE68B_74MGARCMNT0WWZ2LRKPVPNKVN_RT",
Password = "Pr3W0jUm8.5iV1Sn3qwIb4NHFHFUZlhc6Px3QKsZKXj8H6X_3jqIu_FG65K7x3clInZ3mKNPKMXh1ScL7nZeHGzNPvlZkAWHFa_7yJF.dKJORTGj5JS22fj9jWwHFStf",
Schema = "D118DA114BA14CA5AA1ECF261DBAE68B",
Host = "hxehost",
Port = 39015
};
How to Create a Repository Object
var connFactory = new HanaDbConnectionFactory();
var hanaConnection = connFactory.CreateConnection(hanaInfo);
repo1 = new HanaGenericRepository<Model1>(hanaConnection, true);
Create a new Repository Object in the ModelController.cs
Paste the code below in the ModelController.cs
using HanaGenericRepository;
using Microsoft.AspNetCore.Mvc;
using Sap.Data.Hana;
using System;
using System.Collections.Generic;
using TestAPIWithHanaGenericRepository.Models;
namespace TestAPIWithHanaGenericRepository.Controllers
{
[Route("api/[controller]")]
[ApiController]
public class ModelController : ControllerBase
{
private HanaConnectionInfo _hanaConnInfo = null;
private HanaConnection _hanaConnection = null;
private bool _preventSqlInjection = true;
private HanaGenericRepository<Model1> repo1 = null;
public ModelController()
{
_hanaConnInfo = new HanaConnectionInfo()
{
Tenant = "HXE",
UserName = "D118DA114BA14CA5AA1ECF261DBAE68B_183JN8QS8E7HWULO7SL3FNIUQ_RT",
Password = "Wk98eti9PfZt0UDYB90nFHXExBkV0H19A4COXLwkzGVf5TAelMQOU-U1AhzhRh_rMlTRlqNaOW8y1nRbES-ddKyzeOikp_n_0bM4gxOTwGB.FeFX062GBnUiMzha89pe",
Schema = "D118DA114BA14CA5AA1ECF261DBAE68B",
Host = "hxehost",
Port = 39015
};
var connFactory = new HanaDbConnectionFactory();
_hanaConnection = connFactory.CreateConnection(_hanaConnInfo);
repo1 = new HanaGenericRepository<Model1>(_hanaConnection, _preventSqlInjection);
}
[HttpGet]
public List<Model1> GetModel1Objects()
{
var count = repo1.Count();
if(count == 0)
{
var newRecord = new Model1()
{
Active = true,
DateTimeValue = DateTime.Now,
Email = "test@test.com",
Id = Guid.NewGuid(),
IntValue = 1,
Name = "name",
NotMappedProperty = "does not persist",
NotMappedProperty2 = 2f
};
var ok = repo1.Create(newRecord);
}
var models = repo1.GetPaged();
return models;
}
}
}
Run the new API
Sample code
https://github.com/radu103/hana-generic-repository-test-db
https://github.com/radu103/hana-generic-repository-test-api
