TreeView绑定数据库收藏
新一篇: TextBox信纸样式显示数据库：
公司：id(int) company(varchar(50)
部门：id(int) deid(int) department(varchar(50))
班组：id(int) coid(int) class(varchar(50))
前台：
 <asp:TreeView ID="TreeView1" runat="server" ShowLines="true" ExpandDepth="0" >
ShowLines="true"..........................显示连接树的节点
ExpandDepth=“0”...........................展开树的深度
后台：
方法一：
string strConn = System.Configuration.ConfigurationManager.ConnectionStrings["rizhi"].ConnectionString;
protected void Page_Load(object sender, EventArgs e)
  ...{
 if (!IsPostBack)
  ...{
using (SqlConnection conn = new SqlConnection(strConn))
...{
DataSet ds_company = new DataSet();//实例化数据集（公司）
SqlDataAdapter sda_company = new SqlDataAdapter("select * from [company]", conn);//实例化数据适配器（公司）
sda_company.Fill(ds_company, "company");//虚拟表填充到内存
for (int i = 0; i < ds_company.Tables["company"].Rows.Count; i++)//循环所有"公司"
...{
TreeNode td_company = new TreeNode();//实例化公司节点
td_company.Text = ds_company.Tables["company"].Rows[i]["company"].ToString();//公司节点名称
TreeView1.Nodes.Add(td_company);//将公司节点添加至"树"
DataSet ds_department = new DataSet();//实例化数据集（部门）
SqlDataAdapter sda_department = new SqlDataAdapter("select * from [department] where [coid]=" + ds_company.Tables["company"].Rows[i]["id"], conn);//实例化数据库适配器（部门）
sda_department.Fill(ds_department, "department");//虚拟表填充到内存
for (int j = 0; j < ds_department.Tables["department"].Rows.Count; j++)//循环 ds.Tables["company"].Rows[i]["id"] 对应的所有部门
...{
TreeNode td_department = new TreeNode();//实例化部门节点
td_department.Text = ds_department.Tables["department"].Rows[j]["department"].ToString();//部门节点名称
td_company.ChildNodes.Add(td_department);//填充部门节点至"树"
DataSet ds_class = new DataSet();//实例化数据集（班组）
SqlDataAdapter sda_class = new SqlDataAdapter("select * from [class] where [deid]=" + ds_department.Tables["department"].Rows[j]["id"], conn);//实例化数据库适配器（班组）
sda_class.Fill(ds_class, "class");//虚拟表填充到内存
for (int z = 0; z < ds_class.Tables["class"].Rows.Count; z++)//循环 ds_department.Tables["department"].Rows[j]["id"] 对应的所有部门
...{
TreeNode td_class = new TreeNode();//实例化班组节点
td_class.Text = ds_class.Tables["class"].Rows[z]["class"].ToString();//班组节点名称
td_department.ChildNodes.Add(td_class);//填充班组节点至"树"
 }
}
}
}
}
 }
}
方法二：
string strConn = System.Configuration.ConfigurationManager.ConnectionStrings["rizhi"].ConnectionString;
protected void Page_Load(object sender, EventArgs e)
...{
if (!IsPostBack)
...{
DataSet ds = new DataSet();
SqlConnection conn = new SqlConnection(strConn);
using (conn)
...{
SqlDataAdapter sda_Company = new SqlDataAdapter("select [id],[company] from [company]", conn);
sda_Company.Fill(ds, "company");
TreeNode tn_Company;
TreeNode tn_Department;
TreeNode tn_Class;
foreach (DataRow company_row in ds.Tables["company"].Rows)
...{
tn_Company = new TreeNode();
tn_Company.Text = company_row["company"].ToString();
tn_Company.Value = company_row["id"].ToString();
TreeView1.Nodes.Add(tn_Company);
SqlDataAdapter sda_Department = new SqlDataAdapter("select [id],[department] from [department] where coid=" + tn_Company.Value, conn);
sda_Department.Fill(ds, "department");
if (ds.Tables["department"].Rows.Count > 0)
...{
foreach (DataRow department_row in ds.Tables["department"].Rows)
...{
tn_Department = new TreeNode();
tn_Department.Text = department_row["department"].ToString();
tn_Department.Value = department_row["id"].ToString();
tn_Company.ChildNodes.Add(tn_Department);
SqlDataAdapter sda_Class = new SqlDataAdapter("select [id],[class] from [class] where deid=" + tn_Department.Value, conn);
sda_Class.Fill(ds, "class");
if (ds.Tables["class"].Rows.Count > 0)
...{
foreach (DataRow class_row in ds.Tables["class"].Rows)
...{
tn_Class = new TreeNode();
tn_Class.Text = class_row["class"].ToString();
tn_Class.Value = class_row["id"].ToString();
tn_Department.ChildNodes.Add(tn_Class);
}
ds.Tables["class"].Clear();
}
sda_Class.Dispose();
}
ds.Tables["department"].Clear();
}
sda_Department.Dispose();
}
sda_Company.Dispose();
}
}
} |
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