删除子父节点中的某个节点代码,Java代码库,德仔网

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【Java】删除子父节点中的某个节点
作者: / 发布于2016/12/21/ 377
删除子父节点中的某个节点
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;


public class deleteNoteMysql {


public static void main(String args[]) throws SQLException {
Connection conn = DB.getConn();
Statement stmt = conn.createStatement();
ResultSet rs = null;
int id = 33;
rs = stmt.executeQuery("select * from category where id=33");
rs.next();
int a = rs.getInt(7);
int pidd = rs.getInt(2);
if (pidd == 0) {
de(id, a);
} else {
de(id, a);
rs = stmt.executeQuery("select count(*)  from category where pid ="
+ pidd);
System.out.println("pidd=" + pidd);
rs.next();
int count = rs.getInt(1);
if (count <= 0) {
stmt.executeUpdate("update category set isLeaf=0 where id= "
+ pidd);
}
}
System.out.println(a);
}


private static void de(int id, int isleaf) throws SQLException {//如果删除的节点的父节点没有其他节点需要设置父节点的idLeaf为0
// TODO Auto-generated method stub
Connection conn = DB.getConn();
Statement st = conn.createStatement();
if (isleaf == 0) {


st.execute("delete from category where id =" + id);
} else {
ResultSet rs = st
.executeQuery("select *  from category where pid =" + id);
while (rs.next()) {
System.out.println(rs.getInt(1));
de(rs.getInt(1), rs.getInt(7));
}
st.execute("delete from category where id =" + id);
}
}
}








/*
import java.sql.*;


public class DB {
public static Connection getConn() {
Connection conn = null;
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:mysql://localhost/shopping?user=root&password=admin");
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}

return conn;
}
}
*/
/*
Navicat MySQL Data Transfer


Source Server         : root
Source Server Version : 50527
Source Host           : localhost:3306
Source Database       : shopping


Target Server Type    : MYSQL
Target Server Version : 50527
File Encoding         : 65001


Date: 2013-02-23 10:53:44




SET FOREIGN_KEY_CHECKS=0;


-- ----------------------------
-- Table structure for `category`
-- ----------------------------
DROP TABLE IF EXISTS `category`;
CREATE TABLE `category` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `pid` int(11) DEFAULT NULL,
  `name` varchar(255) DEFAULT NULL,
  `descr` varchar(255) DEFAULT NULL,
  `cno` int(11) DEFAULT NULL,
  `grade` int(11) DEFAULT NULL,
  `isLeaf` int(1) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=41 DEFAULT CHARSET=utf8;


-- ----------------------------
-- Records of category
-- ----------------------------
INSERT INTO `category` VALUES ('31', '0', 'a', 'a', '2147483647', '1', '1');
INSERT INTO `category` VALUES ('32', '0', 'b', 'b', '-2', '1', '1');
INSERT INTO `category` VALUES ('33', '32', 'aa', 'aa', '2147483645', '2', '1');
INSERT INTO `category` VALUES ('34', '33', 'aaa', 'fahdgjhdfjkgjkl', '-4', '3', '1');
INSERT INTO `category` VALUES ('35', '34', 'aaaa', 'aaaa', '2147483643', '4', '0');
INSERT INTO `category` VALUES ('36', '31', 'afgas', 'asg', '-2', '2', '1');
INSERT INTO `category` VALUES ('37', '36', 'asg', 'asfhsdh', '2147483645', '3', '0');
INSERT INTO `category` VALUES ('38', '36', '', '', '-4', '3', '0');
INSERT INTO `category` VALUES ('39', '31', 'dh', 'fdgjhfd', '2147483645', '2', '0');
INSERT INTO `category` VALUES ('40', '31', 'dfgh', 'dfjhdfj', '-4', '2', '0');
*/
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