關於Dapper的使用筆記1

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********************************************************************1、Execute a query and map the results to a strongly typed ListNote: all extension methods assume the connection is already open, they will fail if the connection is closed.public static IEnumerable<T> Query<T>(this IDbConnection cnn, string sql, object param = null, SqlTransaction transaction = null, bool buffered = true)Example usage:

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; } }}             var guid = Guid.NewGuid();var dog = connection.Query<Dog>("select Age = @Age, Id = @Id", new { Age = (int?)null, Id = guid }); dog.Count().IsEqualTo(1);dog.First().Age.IsNull();dog.First().Id.IsEqualTo(guid);

 

 ********************************************************************2、Execute a query and map it to a list of dynamic objects

public static IEnumerable<dynamic> Query (this IDbConnection cnn, string sql, object param = null, SqlTransaction transaction = null, bool buffered = true)This method will execute SQL and return a dynamic list.Example usage:var rows = connection.Query("select 1 A, 2 B union all select 3, 4"); ((int)rows[0].A).IsEqualTo(1);((int)rows[0].B).IsEqualTo(2);((int)rows[1].A).IsEqualTo(3);((int)rows[1].B).IsEqualTo(4); DbConnection con = this.GetConnection();return con.Query<t_So>("select * from dbo.t_so").ToList();//可以像上面一樣，支援參數化查詢，直接簡單！

 

********************************************************************3、Execute a Command that returns no results

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

向資料據插入對象：

t_So so = new t_So();so.KeySeq = Guid.NewGuid();so.SoNo = this.sSoNo.Text;so.SoDate = GetValue.GetDateTime(this.sSoDate.Text);so.CustomerName = this.sCustomerName.Text;so.Remark = this.sRemark.Text; string strSQL = @"INSERT INTO dbo.t_so(KeySeq,SoNo,SoDate,CustomerName,Remark)VALUES(@KeySeq,@SoNo,@SoDate,@CustomerName,@Remark)";DbConnection con = this.GetConnection();//con.Execute(strSQL, new {KeySeq = so.KeySeq, SoNo = so.SoNo, SoDate = so.SoDate, CustomerName = so.CustomerName, Remark = so.Remark});con.Execute(strSQL, so);

********************************************************************

4、Execute a Command multiple times The same signature also allows you to conveniently and efficiently execute a command multiple times (for example to bulk-load data) Example usage:

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); // 3 rows inserted: "1,1", "2,2" and "3,3"

This works for any parameter that implements IEnumerable for some T. 這個可以批量插入的，不錯! 

關於Dapper的使用筆記1