1.添加根节点: hierarchyid GetRoot()方法
--创建数据库 create table Employeeh(EmployeeID int,Name varchar(500),ManagerID int,EmplyeeNode hierarchyID) --添加根节点的记录 insert Employeeh values(1,'CEO',null,hierarchyid::GetRoot()) --添加两个平级的子节点 --1.定义父节点 declare @rootmanager hierarchyid --对变量进行赋值 set @rootmanager=(select EmplyeeNode from Employeeh where EmployeeID=1) --父节点作为子节点进行插入 insert Employeeh values(2,'Manager1',1,@rootmanager.GetDescendant(null,null)) --插入第二条数据 declare @manager1 hierarchyid set @manager1=(select EmplyeeNode from Employeeh where EmployeeID=2) insert Employeeh values(3,'Manager2',1,@rootmanager.GetDescendant(@manager1,null)) --访问表的数据 select EmployeeID,Name,ManagerID,EmplyeeNode.ToString() from Employeeh
结果:
2.添加子节点:父节点GetDescendant()方法
在子节点中在添加子节点:
--在Manager1 中添加子节点 declare @manager1 hierarchyid set @manager1=(select EmplyeeNode from Employeeh where EmployeeID=3) insert Employeeh values(4,'SubManager1',2,@manager1.GetDescendant(null,null)) declare @manager2 hierarchyid set @manager2=(select EmplyeeNode from Employeeh where EmployeeID=3) insert Employeeh values(5,'SubManager2',3,@manager2.GetDescendant(null,null))
--查询
select EmployeeID,Name,ManagerID,EmplyeeNode.ToString() from Employeeh
--访问节点所在的层次结构 select EmployeeID,Name,ManagerID,EmplyeeNode.ToString(),EmplyeeNode.GetLevel() from Employeeh
3.获取当前级别:当前节点GetLevel()方法
4.获取当前节点下所有子节点,判断条件:where 列名 IsDescendantOf(当前节点)=1 or 0
--查看当前节点下的子节点 --1.申明当前的节点 declare @current hierarchyid set @current=(select EmplyeeNode from Employeeh where Name='Manager2') select EmployeeID,Name,ManagerID,EmplyeeNode.ToString(),EmplyeeNode.GetLevel() from Employeeh --判断当前节点的子节点为真 where EmplyeeNode.IsDescendantOf(@current)=1
5.获取当前节点的父节点:判断条件:where 列名 当前节点 GetAncestor(级别)
--查看当前节点所在的父节点 declare @current hierarchyid set @current=(select EmplyeeNode from Employeeh where Name='SubManager2') select EmployeeID,Name,ManagerID,EmplyeeNode.ToString(),EmplyeeNode.GetLevel() from Employeeh where EmplyeeNode=@current.GetAncestor(1)
6.移动节点到新的父节点:Set 列名=当前节点 GetReparentedValue(@OldParent,@NewParent) where
7.索引:深度优化(查询所有的后代)、宽度优先(查询直接后代)
将旧表数据导入层次结构数据新表
新建旧表插入数据:
create table EmployeeOld(employeeid int,managerid int,name varchar(500)) insert EmployeeOld values(1,null,'ceo') insert EmployeeOld values(2,1,'manager1') insert EmployeeOld values(3,1,'manager2') insert EmployeeOld values(4,2,'sub1') insert EmployeeOld values(5,2,'sub2') insert EmployeeOld values(6,3,'sub3') insert EmployeeOld values(7,3,'sub4')
把旧表的数据导入到新表中:
--创建新表(有层次结构的表) create table EmployeeNew(employeeid int,managerid int,name varchar(500),node hierarchyid) --查看以前的表结构 select EmployeeID,Name,ManagerID,EmplyeeNode.ToString() from Employeeh --思路:1.获取子节点在父节点下所对应的的行号 --2.将父节点的hierarchyid 给链接到行号的前面 --1.通用表表达式 获取旧表的数据 并且存储在父节点下的行号 --2.第二个通用表达式使用第一个通用表达式的值,同时连接父节点 hierarchyid的值 ;with eh(employeeid,managerid,name,position) as ( select employeeid,managerid,name,ROW_NUMBER() over(partition by managerid order by employeeid) from EmployeeOld ), employeenewtemp(employeeid,managerid,name,node) as ( select employeeid,managerid,name,hierarchyid::GetRoot() from eh where managerid is null union all select eh.employeeid,eh.managerid,eh.name, CAST(employeenewtemp.node.ToString()+CAST(eh.position as varchar(500)) +'/' as hierarchyid) from eh inner join employeenewtemp on eh.managerid=employeenewtemp.employeeid ) --插入到新表中 insert into EmployeeNew select employeeid,managerid,name,node.ToString() from employeenewtemp
查看数据:
select * from EmployeeOld select employeeid,managerid,name,node.ToString() from EmployeeNew
C#中控制台调用。
一:建立连接返回数据
引入这个命名空间
using Microsoft.SqlServer.Types;
public DataTable getdata() { SqlConnection conn = new SqlConnection("data source=localhost;initial catalog=HRDB1;user id=sa;password=sunliyuan123456"); //打开连接 conn.Open(); //执行Sql语句 SqlDataAdapter da = new SqlDataAdapter("select * from EmployeeNew", conn); //实例化DataSet DataSet ds = new DataSet(); //进行填充 da.Fill(ds, "EmployeeNew"); //释放资源 ds.Dispose(); conn.Close(); //返回第一个表 return ds.Tables[0]; }
二:生成树节点:
/// <summary> /// 生成树的节点 /// </summary> /// <param name="oParent">树节点</param> /// <param name="oTable">得到的表</param> private void LoadTreeNode(TreeNode oParent,DataTable oTable) { //清空所有的节点 oParent.Nodes.Clear(); //取得父节点的数据 放入DataRow DataRow oRow=(DataRow)oParent.Tag; //获取node的值并进行转换 SqlHierarchyId iID =(SqlHierarchyId)oRow["node"]; //的到第一节父节点 出入的值是父节点的id 说明传进来的值就是子节点 var query = from employee in oTable.AsEnumerable() where employee.Field<SqlHierarchyId>("node").GetAncestor(1) .Equals(iID) select employee; //把数据放入到DataView 中 DataView oDV = query.AsDataView(); foreach(DataRowView oR in oDV) { //得到一节子节点 TreeNode oNode = new TreeNode(oR["name"].ToString()); oNode.Tag = oR.Row; LoadTreeNode(oNode,oTable); //附加到父节点 oParent.Nodes.Add(oNode); } }
三:生成树视图并得到根节点
/// <summary> /// 生成树视图并得到根节点 /// </summary> /// <param name="oTV"></param> /// <param name="oTable"></param> /// <param name="key"></param> /// <param name="text"></param> public void LoadTreeView(TreeView oTV,DataTable oTable,string key,string text) { oTV.Nodes.Clear(); SqlHierarchyId iID = new SqlHierarchyId(); TreeNode roonode; //查询根节点 var query = from employee in oTable.AsEnumerable() where employee.Field<SqlHierarchyId>(key).GetAncestor(1) .Equals(iID) select employee; DataView oDV = query.AsDataView(); //找到根节点 if(oDV.Count ==1) { roonode = new TreeNode(oDV[0][text].ToString()); roonode.Tag = oDV[0].Row; LoadTreeNode(roonode, oTable); oTV.Nodes.Add(roonode); } }
对数据进行绑定:
private clsData oData = new clsData(); private DataTable dtData; private void btnGetData_Click(object sender, EventArgs e) { dtData = oData.getdata(); dgData.DataSource = dtData; } private void btnClose_Click(object sender, EventArgs e) { this.Close(); } private void doTV_Click(object sender, EventArgs e) { oData.LoadTreeView(tvData, dtData, "node", "name"); }
效果: