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Introduction

Dapper Extensions is a small library that complements Dapper by adding basic CRUD operations (Get, Insert, Update, Delete) for your POCOs. For more advanced querying scenarios, Dapper Extensions provides a predicate system. The goal of this library is to keep your POCOs pure by not requiring any attributes or base class inheritance.

Customized mappings are achieved through ClassMapper.

Important: This library is a separate effort from Dapper.Contrib (a sub-system of the Dapper project). Important: Check our projects list to see the plans for the next releases.

Features

Naming Conventions

Installation

For more information, please view our Getting Started guide.

http://nuget.org/List/Packages/DapperExtensions

PM> Install-Package DapperExtensions

Examples

The following examples will use a Person POCO defined as:

public class Person
{
    public int Id { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public bool Active { get; set; }
    public DateTime DateCreated { get; set; }
}

Get Operation

using (SqlConnection cn = new SqlConnection(_connectionString))
{
    cn.Open();
    int personId = 1;
    Person person = cn.Get<Person>(personId);	
    cn.Close();
}

Simple Insert Operation

using (SqlConnection cn = new SqlConnection(_connectionString))
{
    cn.Open();
    Person person = new Person { FirstName = "Foo", LastName = "Bar" };
    int id = cn.Insert(person);
    cn.Close();
}

Advanced Insert Operation (Composite Key)

public class Car
{
    public int ModelId { get; set; }
    public int Year { get; set; }
    public string Color { get; set; }
}

...

using (SqlConnection cn = new SqlConnection(_connectionString))
{
    cn.Open();
    Car car = new Car { Color = "Red" };
    var multiKey = cn.Insert(car);
    cn.Close();

    int modelId = multiKey.ModelId;
    int year = multiKey.Year;
}

Simple Update Operation

using (SqlConnection cn = new SqlConnection(_connectionString))
{
    cn.Open();
    int personId = 1;
    Person person = cn.Get<Person>(personId);
    person.LastName = "Baz";
    cn.Update(person);
    cn.Close();
}

Simple Delete Operation

using (SqlConnection cn = new SqlConnection(_connectionString))
{
    cn.Open();
    Person person = cn.Get<Person>(1);
    cn.Delete(person);
    cn.Close();
}

GetList Operation (with Predicates)

using (SqlConnection cn = new SqlConnection(_connectionString))
{
    cn.Open();
    var predicate = Predicates.Field<Person>(f => f.Active, Operator.Eq, true);
    IEnumerable<Person> list = cn.GetList<Person>(predicate);
    cn.Close();
}

Generated SQL

SELECT 
   [Person].[Id]
 , [Person].[FirstName]
 , [Person].[LastName]
 , [Person].[Active]
 , [Person].[DateCreated] 
FROM [Person] 
WHERE ([Person].[Active] = @Active_0)

More information on predicates can be found in our wiki.

Count Operation (with Predicates)

using (SqlConnection cn = new SqlConnection(_connectionString))
{
    cn.Open();
    var predicate = Predicates.Field<Person>(f => f.DateCreated, Operator.Lt, DateTime.UtcNow.AddDays(-5));
    int count = cn.Count<Person>(predicate);
    cn.Close();
}            

Generated SQL

SELECT 
   COUNT(*) Total 
FROM [Person] 
WHERE ([Person].[DateCreated] < @DateCreated_0)

More information on predicates can be found in our wiki.

License

Copyright 2011 Thad Smith, Page Brooks and contributors

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.