FluentCommand.Dapper 10.2.0

FluentCommand

Fluent Wrapper for DbCommand.

Package	Version
FluentCommand
FluentCommand.Dapper
FluentCommand.SqlServer
FluentCommand.Json

Download

The FluentCommand library is available on nuget.org via package name FluentCommand.

To install FluentCommand, run the following command in the Package Manager Console

PM> Install-Package FluentCommand

More information about NuGet package avaliable at https://nuget.org/packages/FluentCommand

Features

• Fluent wrapper over DbConnection and DbCommand
• Callback for parameter return values
• Automatic handling of connection state
• Caching of results
• Automatic creating of entity from DataReader via Dapper
• Create Dynamic objects from DataReader via Dapper
• Handles multiple result sets
• Basic SQL query builder
• Source Generate DataReader

Configuration

Configuration for SQL Server

IDataConfiguration dataConfiguration  = new DataConfiguration(
    SqlClientFactory.Instance, 
    ConnectionString
);

Example

Query all users with email domain. Entity is automaticly created from DataReader.

string email = "%@battlestar.com";
string sql = "select * from [User] where EmailAddress like @EmailAddress";

var session = configuration.CreateSession();
var user = await session
    .Sql(sql)
    .Parameter("@EmailAddress", email)
    .QuerySingleAsync(r => new User
    {
        Id = r.GetGuid("Id"),
        EmailAddress = r.GetString("EmailAddress"),
        IsEmailAddressConfirmed = r.GetBoolean("IsEmailAddressConfirmed"),
        DisplayName = r.GetString("DisplayName"),
        PasswordHash = r.GetString("PasswordHash"),
        ResetHash = r.GetString("ResetHash"),
        InviteHash = r.GetString("InviteHash"),
        AccessFailedCount = r.GetInt32("AccessFailedCount"),
        LockoutEnabled = r.GetBoolean("LockoutEnabled"),
        LockoutEnd = r.GetDateTimeOffsetNull("LockoutEnd"),
        LastLogin = r.GetDateTimeOffsetNull("LastLogin"),
        IsDeleted = r.GetBoolean("IsDeleted"),
        Created = r.GetDateTimeOffset("Created"),
        CreatedBy = r.GetString("CreatedBy"),
        Updated = r.GetDateTimeOffset("Updated"),
        UpdatedBy = r.GetString("UpdatedBy"),
        RowVersion = r.GetBytes("RowVersion"),
    });

Execute a stored procedure with out parameters

Guid userId = Guid.Empty;
int errorCode = -1;

var username = "test." + DateTime.Now.Ticks;
var email = username + "@email.com";

var session = configuration.CreateSession();
var result = session
    .StoredProcedure("[dbo].[aspnet_Membership_CreateUser]")
    .Parameter("@ApplicationName", "/")
    .Parameter("@UserName", username)
    .Parameter("@Password", "T@est" + DateTime.Now.Ticks)
    .Parameter("@Email", email)
    .Parameter("@PasswordSalt", "test salt")
    .Parameter<string>("@PasswordQuestion", null)
    .Parameter<string>("@PasswordAnswer", null)
    .Parameter("@IsApproved", true)
    .Parameter("@CurrentTimeUtc", DateTime.UtcNow)
    .Parameter("@UniqueEmail", 1)
    .Parameter("@PasswordFormat", 1)
    .ParameterOut<Guid>("@UserId", p => userId = p)
    .Return<int>(p => errorCode = p)
    .Execute();

Query for user by email address. Also return Role and Status entities.

string email = "kara.thrace@battlestar.com";
string sql = "select * from [User] where EmailAddress = @EmailAddress; " +
             "select * from [Status]; " +
             "select * from [Priority]; ";

User user = null;
List<Status> status = null;
List<Priority> priorities = null;

var session = configuration.CreateSession();
session
    .Sql(sql)
    .Parameter("@EmailAddress", email)
    .QueryMultiple(q =>
    {
        user = q.QuerySingle<User>();
        status = q.Query<Status>().ToList();
        priorities = q.Query<Priority>().ToList();
    });

Dapper

PM> Install-Package FluentCommand.Dapper

Use Dapper to materialize data reader to entities

string email = "kara.thrace@battlestar.com";
string sql = "select * from [User] where EmailAddress = @EmailAddress";

var session = configuration.CreateSession();
var user = await session
    .Sql(sql)
    .Parameter("@EmailAddress", email)
    .QuerySingleAsync<User>();

Query Builder

Build SQL statements with the query builder. Query builder uses the DataAnnotations Schema attributes to extract table and column information.

var session = configuration.CreateSession();

string email = "kara.thrace@battlestar.com";

var user = await session
    .Sql(builder => builder
        .Select<User>() // table name comes from type
        .Where(p => p.EmailAddress, email)
    )
    .QuerySingleAsync();

Count query

string email = "kara.thrace@battlestar.com";

var count = await session
    .Sql(builder => builder
        .Select<User>()
        .Count()
        .Where(p => p.EmailAddress, email)
    )
    .QueryValueAsync<int>();

Insert statement

var id = Guid.NewGuid();

var userId = await session
    .Sql(builder => builder
        .Insert<User>()
        .Value(p => p.Id, id)
        .Value(p => p.EmailAddress, $"{id}@email.com")
        .Value(p => p.DisplayName, "Last, First")
        .Value(p => p.FirstName, "First")
        .Value(p => p.LastName, "Last")
        .Output(p => p.Id) // return key as output value
        .Tag() // add comment tag to querey
    )
    .QueryValueAsync<Guid>();

Update statement

var updateId = await session
    .Sql(builder => builder
        .Update<User>()
        .Value(p => p.DisplayName, "Updated Name")
        .Output(p => p.Id)
        .Where(p => p.Id, id)
        .Tag()
    )
    .QueryValueAsync<Guid>();

Delete statement

var deleteId = await session
    .Sql(builder => builder
        .Delete<User>()
        .Output(p => p.Id)
        .Where(p => p.Id, id)
        .Tag()
    )
    .QueryValueAsync<Guid>();

Source Generator

The project supports generating a DbDataReader from a class via an attribute. Add the GenerateDataReaderAttribute to a class to generate the needed extension methods.

[GenerateDataReader]
[Table("Status", Schema = "dbo")]
public class Status
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Description { get; set; }
    public int DisplayOrder { get; set; }
    public bool IsActive { get; set; }
    public DateTimeOffset Created { get; set; }
    public string CreatedBy { get; set; }
    public DateTimeOffset Updated { get; set; }
    public string UpdatedBy { get; set; }

    [ConcurrencyCheck]
    [DatabaseGenerated(DatabaseGeneratedOption.Computed)]
    [DataFieldConverter(typeof(ConcurrencyTokenHandler))]
    public ConcurrencyToken RowVersion { get; set; }

    [NotMapped]
    public virtual ICollection<Task> Tasks { get; set; } = new List<Task>();
}

SQL Server Features

PM> Install-Package FluentCommand.SqlServer

Bulk Copy

Using SQL Server bulk copy feature to import a lot of data.

using (var session = configuration.CreateSession())
{
    session.BulkCopy("[User]")
        .AutoMap()
        .Ignore("RowVersion")
        .WriteToServer(users);
}

Merge Data

Generate and merge data into a table

var users = generator.List<UserImport>(100);

int rows;
using (var session = configuration.CreateSession())
{
    rows = session
        .MergeData("dbo.User")
        .Map<UserImport>(m => m
            .AutoMap()
            .Column(p => p.EmailAddress).Key()
        )
        .Execute(users);
}