dapper.simplecurd

[Table("Users")]//真实表名
    publicclass User
    {
        [Key]
        publicint UserId { get; set; }
        [Column("strFirstName"]  //真实列名
        publicstring FirstName { get; set; }//列别名
        publicstring LastName { get; set; }
        publicint Age { get; set; }
    }

    var user = connection.Get<User>(1);  

改动后该查询相当于sql

Select UserId, strFirstName as FirstName, LastName, Age from[Users]where UserId =@UserID

　　2.GetList方法

publicstatic IEnumerable<T> GetList<T>(this IDbConnection connection)

　　

publicclass User
{
    publicint Id { get; set; }
    publicstring Name { get; set; }
    publicint Age { get; set; }
}

查询全部

var user = connection.GetList<User>();  

相当于Sql

Select*from[User]

使用条件实体查询

publicclass User
{
    publicint Id { get; set; }
    publicstring Name { get; set; }
    publicint Age { get; set; }
}

var user = connection.GetList<User>(new { Age = 10 });  

　　

Select*from[User]where Age =@Age

　　

//使用字符串条件查询
publicclass User
{
    publicint Id { get; set; }
    publicstring Name { get; set; }
    publicint Age { get; set; }
}

var user = connection.GetList<User>("where age = 10 or Name like '%Smith%'");  

　　

//相当于SQL
Select*from[User]where age =10or Name like'%Smith%'

　　

//分页查询：
publicstatic IEnumerable<T> GetListPaged<T>(this IDbConnection connection, int pageNumber, int rowsPerPage, string conditions, stringorderby)

publicclass User
{
    publicint Id { get; set; }
    publicstring Name { get; set; }
    publicint Age { get; set; }
}

var user = connection.GetListPaged<User>(1,10,"where age = 10 or Name like '%Smith%'","Name desc");  

　　

//相当于SQl：
SELECT * FROM (SELECT ROW_NUMBER() OVER(ORDER BY Name desc) AS PagedNumber, Id, Name, Age FROM [User] where age = 10 or Name like '%Smith%') AS u WHERE PagedNUMBER BETWEEN ((1 - 1) * 10 + 1) AND (1 * 10)

　　

//插入方法
publicstaticint Insert(this IDbConnection connection, object entityToInsert)

[Table("Users")]
publicclass User
{
   [Key]
   publicint UserId { get; set; }
   publicstring FirstName { get; set; }
   publicstring LastName { get; set; }
   publicint Age { get; set; }

   //Additional properties not in database   [Editable(false)]
   publicstring FullName { get { returnstring.Format("{0} {1}", FirstName, LastName); } }
   public List<User> Friends { get; set; }
   [ReadOnly(true)]
   public DateTime CreatedDate { get; set; }
}

var newId = connection.Insert(new User { FirstName = "User", LastName = "Person",  Age = 10 });  
//相当于SQL
Insertinto[Users] (FirstName, LastName, Age) VALUES (@FirstName, @LastName, @Age)

　　

//更新方法
[Table("Users")]public class User{
   [Key]publicint UserId { get; set; }
   [Column("strFirstName")]public string FirstName { get; set; }
   public string LastName { get; set; }
   publicint Age { get; set; }

   //Additional properties notindatabase[Editable(false)]public string FullName { get { return string.Format("{0} {1}", FirstName, LastName); } }
   public List<User> Friends { get; set; }
}
connection.Update(entity);
//相当于SQL
Update[Users]Set (strFirstName=@FirstName, LastName=@LastName, Age=@Age) Where ID =@ID

　　删除方法：

public static intDelete<T>(this IDbConnection connection, int Id)

public class User{
   publicint Id { get; set; }
   public string FirstName { get; set; }
   public string LastName { get; set; }
   publicint Age { get; set; }
}
connection.Delete<User>(newid);

或

public static intDelete<T>(this IDbConnection connection, T entityToDelete)

public class User{
   publicint Id { get; set; }
   public string FirstName { get; set; }
   public string LastName { get; set; }
   publicint Age { get; set; }
}

connection.Delete(entity);
相当于SQl
DeleteFrom[User]Where ID =@ID
删除多条
1.根据实体删除
public static int DeleteList<T>(this IDbConnection connection, object whereConditions, IDbTransaction transaction=null, int? commandTimeout =null)

connection.DeleteList<User>(new { Age =10 });

2.根据条件删除
public static int RecordCount<T>(this IDbConnection connection, string conditions = "")

connection.DeleteList<User>("Where age >20");

　　统计

public static int RecordCount<T>(this IDbConnection connection, string conditions = "")

varcount= connection.RecordCount<User>("Where age >20");