mybatis级联查询树形结构（如菜单）

 

1、查询指定ID下所有的子节点（从顶层到底层--多层结构）

id为0 查询所有节点

import java.util.List;

/**

 */
public class TreeVO {
	
	private Integer id;
	private String name;
	private Integer pid;
	private List list;

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Integer getPid() {
		return pid;
	}

	public void setPid(Integer pid) {
		this.pid = pid;
	}

	public List getList() {
		return list;
	}

	public void setList(List list) {
		this.list = list;
	}
	
}

 

	
		
		
		
		
	
	
	
    
         select * from t_tree where pid = 0
    
 
    
    
         select * from t_tree where pid = #{id}
    
	

 

数据库数据结构如下：

 

 

查询出来后，json格式化：

 

 

2、根据指定ID 查询其所有父级（从底层到顶层--多层结构）

import java.util.List;

/**

 */
public class TreeVO {
	
	private Integer id;
	private String name;
	private Integer pid;
	private List list;

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Integer getPid() {
		return pid;
	}

	public void setPid(Integer pid) {
		this.pid = pid;
	}

	public List getList() {
		return list;
	}

	public void setList(List list) {
		this.list = list;
	}
	
}

 

 

@Mapper
public interface TreeVOMapper {

	
	List selectAllTree() ;
	
	List selectAllParentTreeBySubId(Integer id) ;
	
}

http://localhost:8080/tree2?id=12