數據庫結構:

表內的數據:

自定義函數: 遞歸查出 樹下所有節點 ,參數是 父id

create function sss(@id as int)returns @t table(id int not null,name int not null,pid int null)asbegindeclare @lay as int;insert into @t select * from tree where pid =@id;select @lay = min(id) from tree where pid =@id; --第一次 @lay=5while @lay is not nullbegininsert into @t select * from sss(@lay);select @lay=min(id) from treewhere id>@lay and pid=@idendreturn;endgo .net代碼: string cons = ConfigurationManager.ConnectionStrings["ApplicationServices"].ToString();using (SqlConnection con=new SqlConnection(cons)){if (con.State==ConnectionState.Closed){con.Open();}string sql = "select * from sss(@id)";SqlCommand cmd = new SqlCommand(sql,con);cmd.CommandType = CommandType.Text;cmd.Parameters.Add(new SqlParameter("@id", DbType.Int32)).Value = 4;cmd.Parameters.Add("@re",DbType.String);cmd.Parameters["@re"].Direction = ParameterDirection.ReturnValue;SqlDataReader dr = cmd.ExecuteReader();while (dr.Read()){int i = 0;Response.Write(dr[0].ToString() + "\t\t\t" +dr[1].ToString() +"\t\t\t"+ dr[2].ToString() + "</br>");i++;}con.Close(); .csharpcode, .csharpcode pre { font-size: small; color: rgba(0, 0, 0, 1); font-family: consolas, "Courier New", courier, monospace; background-color: rgba(255, 255, 255, 1) } .csharpcode pre { margin: 0 } .csharpcode .rem { color: rgba(0, 128, 0, 1) } .csharpcode .kwrd { color: rgba(0, 0, 255, 1) } .csharpcode .str { color: rgba(0, 96, 128, 1) } .csharpcode .op { color: rgba(0, 0, 192, 1) } .csharpcode .preproc { color: rgba(204, 102, 51, 1) } .csharpcode .asp { background-color: rgba(255, 255, 0, 1) } .csharpcode .html { color: rgba(128, 0, 0, 1) } .csharpcode .attr { color: rgba(255, 0, 0, 1) } .csharpcode .alt { background-color: rgba(244, 244, 244, 1); width: 100%; margin: 0 } .csharpcode .lnum { color: rgba(96, 96, 96, 1) } .csharpcode, .csharpcode pre { font-size: small; color: rgba(0, 0, 0, 1); font-family: consolas, "Courier New", courier, monospace; background-color: rgba(255, 255, 255, 1) } .csharpcode pre { margin: 0 } .csharpcode .rem { color: rgba(0, 128, 0, 1) } .csharpcode .kwrd { color: rgba(0, 0, 255, 1) } .csharpcode .str { color: rgba(0, 96, 128, 1) } .csharpcode .op { color: rgba(0, 0, 192, 1) } .csharpcode .preproc { color: rgba(204, 102, 51, 1) } .csharpcode .asp { background-color: rgba(255, 255, 0, 1) } .csharpcode .html { color: rgba(128, 0, 0, 1) } .csharpcode .attr { color: rgba(255, 0, 0, 1) } .csharpcode .alt { background-color: rgba(244, 244, 244, 1); width: 100%; margin: 0 } .csharpcode .lnum { color: rgba(96, 96, 96, 1) }

}

實現的效果如下:

總結

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