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运用递归删除父节点同事删除子节点

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<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>

<%@ page import="java.sql.*" %>

<%!

private void del(Connection conn,int id){ //定义了del函数

Statement stmt=null;

ResultSet rs=null;

try{

stmt=conn.createStatement();

String sql="select * from article where pid=" +id ;

rs=stmt.executeQuery(sql);

while(rs.next()){

del(conn,rs.getInt("id"));

}

stmt.executeUpdate("delete from article where id="+id); //递归删除子条目

}catch(SQLException e){

e.printStackTrace();

}finally{

try {

if(rs != null) {

rs.close();

rs = null;

}

if(stmt != null) {

stmt.close();

stmt = null;

}

} catch (SQLException e) {

e.printStackTrace();

}

}

}

%>

<%

String admin=(String)session.getAttribute("admin");

if(admin==null||!admin.equals("true")){

out.println("请登陆");

return;

}

%>

<%

int id= Integer.parseInt(request.getParameter("id"));

int pid= Integer.parseInt(request.getParameter("pid"));

Class.forName("com.mysql.jdbc.Driver");

String url = "jdbc:mysql://localhost/bbs?user=root&password=admin";

Connection conn = DriverManager.getConnection(url);

conn.setAutoCommit(false); //设置不要自动提交

del(conn,id);

Statement stmt=conn.createStatement();

ResultSet rs=stmt.executeQuery("select count(*) from article where pid="+pid);

rs.next();

int count=rs.getInt(1);

rs.close();

stmt.close();

if(count<=0){ // 判断要删除的节点的父节点是否为变成叶子节点

Statement stmtUpdate=conn.createStatement();

stmtUpdate.executeUpdate("update article set isleaf=0 where id ="+pid);

stmtUpdate.close();

}

conn.commit(); //提交SQL语句

conn.setAutoCommit(true); //回复conn的提交方式为自动提交

conn.close();

%>

<html>

<head>

<title>My JSP 'Delete.jsp' starting page</title>

</head>

<body>

<a href="ShowArticleTree.jsp"><font size="7" color="#ff0080">删除成功,点击返回 </font><br></a>

</body>

</html>

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运用递归 删除父节点同事删除子节点

运用递归删除父节点同事删除子节点