//保存对象
db.Save(article);
db.Save(new Article { Title = "Super easy to use PetaPoco" });
db.Save("Articles", "Id", { Title = "Super easy to use PetaPoco", Id = Guid.New() });

//获取一个对象
var article = db.Single<Article>(123);
var article = db.Single<Article>("WHERE ArticleKey = @0", "ART-123");

//删除一个对象
db.Delete(article);
db.Delete<Article>(123);
db.Delete("Articles", "Id", 123);
db.Delete("Articles", "ArticleKey", "ART-123");

//IDbConnection扩展查询
public  static  IEnumerable < T > Query < T >（this IDbConnection conn，string  sql，object  param  =  null，SqlTransaction  transaction  =  null，bool  buffered  =  true）

public class Dog
{
    public int? Age { get; set; }
    public Guid Id { get; set; }
    public string Name { get; set; }
    public float? Weight { get; set; }

    public int IgnoredProperty { get { return 1; } }
}            
//简单查询
var guid = Guid.NewGuid();
var dog = connection.Query<Dog>("select Age = @Age, Id = @Id", new { Age = (int?)null, Id = guid });
//验证统计数量
dog.Count()
    .IsEqualTo(1);
//验证属性是否为null
dog.First().Age
    .IsNull();
//验证属性是否匹配
dog.First().Id
    .IsEqualTo(guid);

//查询两行数据
var rows = connection.Query("select 1 A, 2 B union all select 3, 4");

//行一数据
((int)rows[0].A)
   .IsEqualTo(1);
((int)rows[0].B)
   .IsEqualTo(2);
//行二数据
((int)rows[1].A)
   .IsEqualTo(3);
((int)rows[1].B)
    .IsEqualTo(4);

public static int Execute(this IDbConnection cnn, string sql, object param = null, SqlTransaction transaction = null)

connection.Execute(@"
  set nocount on 
  create table #t(i int) 
  set nocount off 
  insert #t 
  select @a a union all select @b 
  set nocount on 
  drop table #t", new {a=1, b=2 })
   .IsEqualTo(2);

connection.Execute(@"insert MyTable(colA, colB) values (@a, @b)",
    new[] { new { a=1, b=1 }, new { a=2, b=2 }, new { a=3, b=3 } }
  ).IsEqualTo(3);

public class Products:DynamicModel {
    public Products():base("northwind", "products","productid") {}
}
var table = new Products();
var products = table.All();
//获取查询字段和搜索条件
var productsFour = table.All(columns: "ProductName as Name", where: "WHERE categoryID=@0",args: 4);
//分页查询
var result = tbl.Paged(where: "UnitPrice > 20", currentPage:2, pageSize: 20);
var poopy = new {ProductName = "Chicken Fingers"};
//更新 Product对象到表， 条件 ProductID = 12 ，设置 ProductName of "Chicken Fingers"
table.Update(poopy, 12)

//插入数据
var table = new Categories();
var inserted = table.Insert(new {CategoryName = "Buck Fify Stuff", Description = "Things I like"});
//插入成功后得到返回新对象
var newID = inserted.CategoryID;

//插入数据
public int Insert(Employee employee)
{
    return m_DataSource.Insert("HR.Employee", employee).ToInt32().Execute();
}

//更新数据
public void Update(Employee employee)
{
    m_DataSource.Update("HR.Employee", employee).Execute();
}

//初学者更新实体（但容易出问题，如果对应的漏写了一个属性的赋值）
public void Update(Employee employee)
{
    using (var context = new CodeFirstModels())
    {
        var entity = context.Employees.Where(e => e.EmployeeKey == employee.EmployeeKey).First();
        entity.CellPhone = employee.CellPhone;
        entity.FirstName = employee.FirstName;
        entity.LastName = employee.LastName;
        entity.ManagerKey = employee.ManagerKey;
        entity.MiddleName = employee.MiddleName;
        entity.OfficePhone = employee.OfficePhone;
        entity.Title = employee.Title;
        context.SaveChanges();
    }
}

//中级者更新
public void Update(Employee employee)
{
    using (var context = new CodeFirstModels())
    {
        context.Entry(employee).State = EntityState.Modified;
        context.SaveChanges();
    }
}

//获取指定表全部数据
public IList<Employee> GetAll()
{
    return m_DataSource.From("HR.Employee").ToCollection<Employee>().Execute();
}