hibernate 有自带的菜单查询功能,当查询的节点有几千条时,hibernate自带的菜单查询会造成卡顿的情况,但一般情况下hibernate自带的菜单查询减少程序员的代码量,
简化了代码
相关测试数据(MySQL)
-- 一对多双向自关联
-- 菜单表
-- t_hibernate_sys_tree_node
-- t:表
-- sys:模块名缩写(system)
-- tree_noe:表名
create table t_hibernate_sys_tree_node
(
tree_node_id int primary key auto_increment, -- ID
tree_node_name varchar(50) not null, -- 名字
tree_node_type int not null check(tree_node_type = 1 or tree_node_type = 2), -- 节点类型:1 枝节点 2 叶节点
position int, -- 位置
parent_node_id int, -- 父节点ID
url varchar(1024), -- URL
foreign key(parent_node_id) references t_hibernate_sys_tree_node(tree_node_id)
);
-- drop table t_hibernate_sys_tree_node
-- select * from t_hibernate_sys_tree_node
select * from t_hibernate_sys_tree_node;
truncate table t_hibernate_sys_tree_node;
insert into t_hibernate_sys_tree_node(tree_node_id, tree_node_name, tree_node_type, position, parent_node_id, url)
values(1,'系统管理',1, 1,null,null);
insert into t_hibernate_sys_tree_node(tree_node_id, tree_node_name, tree_node_type, position, parent_node_id, url)
values(2,'市场管理',1, 2,null,null);
insert into t_hibernate_sys_tree_node(tree_node_id, tree_node_name, tree_node_type, position, parent_node_id, url)
values(3,'字典管理',2, 3,1,null);
insert into t_hibernate_sys_tree_node(tree_node_id, tree_node_name, tree_node_type, position, parent_node_id, url)
values(4,'用户管理',2, 4,1,null);
insert into t_hibernate_sys_tree_node(tree_node_id, tree_node_name, tree_node_type, position, parent_node_id, url)
values(5,'角色管理',2, 5,1,null);
insert into t_hibernate_sys_tree_node(tree_node_id, tree_node_name, tree_node_type, position, parent_node_id, url)
values(6,'权限管理',1, 6,1,null);
insert into t_hibernate_sys_tree_node(tree_node_id, tree_node_name, tree_node_type, position, parent_node_id, url)
values(7,'进货管理',2, 7,2,null);
insert into t_hibernate_sys_tree_node(tree_node_id, tree_node_name, tree_node_type, position, parent_node_id, url)
values(8,'销售管理',2, 8,2,null);
insert into t_hibernate_sys_tree_node(tree_node_id, tree_node_name, tree_node_type, position, parent_node_id, url)
values(9,'库存管理',2, 9,2,null);
insert into t_hibernate_sys_tree_node(tree_node_id, tree_node_name, tree_node_type, position, parent_node_id, url)
values(10,'用户分配角色',2, 10,6,null);
insert into t_hibernate_sys_tree_node(tree_node_id, tree_node_name, tree_node_type, position, parent_node_id, url)
values(11,'角色授予用户',2, 11,6,null);
);
配置菜单表的映射文件
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.zking.entity.TreeNode" table="t_hibernate_sys_tree_node">
<id name="treeNode_id" type="java.lang.Integer" column="tree_node_id">
<generator class="increment" />
</id>
<property name="treeNode_name" type="java.lang.String" column="tree_node_name"></property>
<property name="treeNode_type" type="java.lang.Integer" column="tree_node_type"></property>
<property name="position" type="java.lang.Integer" column="position"></property>
<property name="url" type="java.lang.String" column="url"></property>
<many-to-one name="treeNode" class="com.zking.entity.TreeNode" column="parent_node_id"></many-to-one>
<!-- <set name="treeNodes" cascade="save-update" inverse="true" >
<key column="parent_node_id"></key>
<one-to-many class="com.zking.entity.TreeNode"/>
</set> -->
<!--
list 集合配置也有list标签,小编比较喜欢用当前这个
order-by:填的表的列段,按照所填的列段排列
-->
<bag order-by="position" name="treeNodes" cascade="save-update" inverse="true" >
<key column="parent_node_id"></key>
<one-to-many class="com.zking.entity.TreeNode"/>
</bag>
</class>
</hibernate-mapping>
菜单实体类
package com.zking.entity;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
public class TreeNode implements Serializable {
/**
* 2018年10月25日下午6:30:23
*/
private static final long serialVersionUID = -5329689980623631639L;
private Integer treeNode_id;
private String treeNode_name;
private Integer treeNode_type;
private Integer position;
private String url;
//父节点
private TreeNode treeNode;
//加载权限是无序的
// private Set<TreeNode> treeNodes = new HashSet<>();
//加载权限是有序的
//子节点
private List<TreeNode> treeNodes = new ArrayList<>();
private Integer initTreeNode;
@Override
public String toString() {
return "TreeNode [treeNode_id="+ treeNode_id +",treeNode_name="+ treeNode_name +",treeNode_type="+ treeNode_type +",position="+ position +",url="+ url +",treeNode="+ treeNode +",treeNodes="+ treeNodes +",initTreeNode="+ initTreeNode +"]";
}
public Integer getTreeNode_id() {
return treeNode_id;
}
public void setTreeNode_id(Integer treeNode_id) {
this.treeNode_id = treeNode_id;
}
public String getTreeNode_name() {
return treeNode_name;
}
public void setTreeNode_name(String treeNode_name) {
this.treeNode_name = treeNode_name;
}
public Integer getTreeNode_type() {
return treeNode_type;
}
public void setTreeNode_type(Integer treeNode_type) {
this.treeNode_type = treeNode_type;
}
public Integer getPosition() {
return position;
}
public void setPosition(Integer position) {
this.position = position;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public TreeNode getTreeNode() {
return treeNode;
}
public void setTreeNode(TreeNode treeNode) {
this.treeNode = treeNode;
}
// public Set<TreeNode> getTreeNodes() {
// return treeNodes;
// }
//
// public void setTreeNodes(Set<TreeNode> treeNodes) {
// this.treeNodes = treeNodes;
//
// }
public Integer getInitTreeNode() {
return initTreeNode;
}
public List<TreeNode> getTreeNodes() {
return treeNodes;
}
public void setTreeNodes(List<TreeNode> treeNodes) {
this.treeNodes = treeNodes;
}
public void setInitTreeNode(Integer initTreeNode) {
this.initTreeNode = initTreeNode;
}
public TreeNode() {
super();
}
public TreeNode(Integer treeNode_id, String treeNode_name, Integer treeNode_type, Integer position, String url,
TreeNode treeNode, List<TreeNode> treeNodes, Integer initTreeNode) {
super();
this.treeNode_id = treeNode_id;
this.treeNode_name = treeNode_name;
this.treeNode_type = treeNode_type;
this.position = position;
this.url = url;
this.treeNode = treeNode;
this.treeNodes = treeNodes;
this.initTreeNode = initTreeNode;
}
}
菜单表权限查询
package com.zking.dao.daoImpl;
import java.util.List;
import org.hibernate.Hibernate;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;
import com.zking.entity.TreeNode;
import com.zking.util.HibernateUtli;
public class TreeNodeDaoImpl implements ITreeNodeDaoImpl {
@Override
public TreeNode getTreeNode(TreeNode treeNode) {
Session session = HibernateUtli.getCurrentSession();
Transaction transaction = session.beginTransaction();
TreeNode t = null;
try {
t = session.get(TreeNode.class, treeNode.getTreeNode_id());
if (null != t && new Integer(1).equals(treeNode.getInitTreeNode())) {
Hibernate.initialize(t.getTreeNodes());
}
transaction.commit();
} catch (Exception e) {
e.printStackTrace();
transaction.rollback();
throw new RuntimeException("查询出现异常");
}
HibernateUtli.closeSession();
return t;
}
测试
package com.zking.test;
import org.junit.Before;
import org.junit.Test;
import com.zking.dao.daoImpl.TreeNodeDaoImpl;
import com.zking.entity.TreeNode;
public class TreeNodeDaoTest {
private TreeNodeDaoImpl daoImpl = null;
private TreeNode node = null;
@Before
public void setUp() throws Exception {
daoImpl = new TreeNodeDaoImpl();
node = new TreeNode();
}
@Test
public void testget() {
this.node.setTreeNode_id(1);
this.node.setInitTreeNode(1);
TreeNode treeNode = this.daoImpl.getTreeNode(this.node);
System.out.println(treeNode.getTreeNode_name());
for (TreeNode s : treeNode.getTreeNodes()) {
System.out.println(s.getTreeNode_id() + "," + s.getTreeNode_name());
}
/*
* 第二种权限加载方案
* 类似于hibernate的懒加载
* 第一加载一级节点和二级节点
* 当点击二级节点再去向获取后台用于展示
*/
}
}