ISqlModelMapper.SaveChanges() Method

.NET Standard 2.x

Saves all of the data changes to the database, by executing the database table operations tracked by the ISqlModelMapper object, and calls the tracked Action delegates during operations.

Namespace: SnapObjects.Data

Assembly: SnapObjects.Data.dll

Syntax

  public IDbResult SaveChanges();

Returns

SnapObjects.Data.IDbResult

Returns an IDbResult object whose property can be used to conveniently get the result of the executed database operation.

Remarks

When the database is updated successfully, SqlModelMapper is restored to its initial state which will not track data changes.

To continue using SqlModelMapper for other data operations, use ISqlModelMapper.TrackCreate method etc. to track the changes again.

Database Transaction

This method will create by default a database transaction where all of the SQL DML will be executed.

When any exceptions occur, the database transaction will be automatically rolled back.

Validation

Before updating the database, the system will validate the data in the model. If detects any error, exceptions will be thrown.

Examples

The following code example demonstrates how to register two new students.

using Appeon.ApiDoc.Models.School;
using System;

namespace Appeon.ApiDoc.ISqlModelMapperExamples
{
    public class SaveChangesExample
    {
        private SchoolContext _context;

        public SaveChangesExample(SchoolContext dataContext)
        {
            // Sets the data context.
            _context = dataContext;
        }

        public void Example()
        {
            var mapper = _context.SqlModelMapper;

            // Tracks the two new students and saves changes to the database.
            var personA = new Person()
            {
                LastName = "Senior",
                FirstName = "Letitia",
                EnrollmentDate = DateTime.Now,
                Discriminator = "Student"
            };

            var personB = new Person()
            {
                LastName = "Ward",
                FirstName = "Lilith",
                EnrollmentDate = DateTime.Now,
                Discriminator = "Student"
            };

            var dbResult = mapper.TrackCreate(personA)
                                 .TrackCreate(personB)
                                 .SaveChanges();

            Console.WriteLine("{0} records have been inserted into the database.",
                dbResult.InsertedCount);

            /* The code produces the following output:
            
            2 records have been inserted into the database.
            */
        }
    }
}

Example Refer To

Model Class: Person

Applies to

.NET Standard

2.x