mysql递归查询子节点，及java后台访问存储过程

MySQL实现树状所有子节点查询。

业务描述：一个产成品是由很多模块组成，每个模块又由许多其他小模块组成，小模块又由… 最小模块才是由基本的元器件组成，现在要列出生产1000台该产品所需购买的所有基本元器件清单。这个过程因为不知道嵌套次数，故只能用函数递归。

在MySQL中如果是有限的层次，我们事先知道树的深度，那我们就可以直接通过left join 来实现，只是代码会繁琐一点，实现功能是没有问题的。但很多时候我们无法控制树的深度。

mysql存储过程。主要用到了递归方式。while,group_concat(),find_in_set()

	CREATE DEFINER=`ww`@`%` PROCEDURE `pro_orderplan_getbomdetail`(in orgbomid varchar(255), bomnum int(10))
	BEGIN
		
	DECLARE FItemIDs varchar(4000) default '';   
	DECLARE FInterIDs varchar(4000) default '';   
	DECLARE res varchar(1000) default '';   
	
	set FInterIDs =(select GROUP_CONCAT(FInterID) from ws_k3_bom where FBOMNumber = orgbomid);
	
	WHILE FInterIDs is not null  do   
			SET res = concat(res,',',FInterIDs);
	    SET FItemIDs =(SELECT GROUP_CONCAT(FItemID) FROM ws_k3_bomchild WHERE FIND_IN_SET(FInterID,FInterIDs));   
	    IF FItemIDs is not null THEN    
	        SET FInterIDs = (select GROUP_CONCAT(FInterID) from ws_k3_bom where FIND_IN_SET(FItemID,FItemIDs));  
	    END IF;   
	END WHILE;
	
	select a.*,b.FFixLeadTime,IFNULL(c.FQty_Stock_total,'0.0') as FQty_Stock_total,IFNULL(c.FQty_PO_total,'0.0') as FQty_PO_total,
	IFNULL(c.FQty_PR_total,'0.0') as FQty_PR_total,IFNULL(c.FQty_Need_total,'0.0') as FQty_Need_total,IFNULL(c.FQty_Remain_total,'0.0') as FQty_Remain_total from 
	(select a.*,(a.FQty*bomnum) as usesnums  from 
	(select FInterID,FItemID,FNumber,FName,SUM(FQty) as FQty,FModel,CONCAT(FItemID,'0') as td, '' as type FROM ws_k3_bomchild where FIND_IN_SET(FInterID,res) GROUP BY FInterID, FItemID
	union
	select a.FInterID,b.FSubsItemID,c.FNumber,c.FName,a.FQty,c.FModel,CONCAT(a.FItemID,b.FPriorityID) as td, '替代' as type from 
	(select FInterID,FItemID,FNumber,FName,SUM(FQty) as FQty,FModel FROM ws_k3_bomchild where FIND_IN_SET(FInterID,res) GROUP BY FInterID, FItemID) a
	LEFT JOIN ws_k3_subsitem b on a.FItemID = b.FItemID and (a.FInterID = b.FApplicableBOM or b.FApplicableBOM = 0) 
	LEFT JOIN ws_k3_icitem c on b.FSubsItemID = c.fitemid where b.FSubsItemID is not NULL GROUP BY b.FSubsItemID ) a
	ORDER BY a.td) a
	LEFT JOIN ws_k3_icitem b on a.FItemID = b.FItemID 
	LEFT JOIN ws_orderplan_MRP_Material_Need_Info c on a.FNumber = c.FNumber ORDER BY a.td;
	
	END

java后台访问存储过程

数据连接方式是spring提供的JdbcTemplate。
java后台从存储过程中获取数据的写法如下：

public String gridDataProdetil(String params){
		String sqlTemp = "";
		try{
			JSONObject jsonObj = JSONObject.fromObject(params);
			final String FBOMNumber = jsonObj.get("FBOMNumber").toString();
			final String FQty = jsonObj.get("FQty").toString();
				String result = (String) jdbcTemplate.execute(  
						 new CallableStatementCreator(){   
					        public  CallableStatement createCallableStatement(Connection con)  throws  SQLException {  
			                    String storedProc = "{call pro_orderplan_getbomdetail(?,?)}";// 调用的存储过程  
			                    CallableStatement cs = con.prepareCall(storedProc);  
			                    cs.setString(1, FBOMNumber);// 设置输入参数的值  
			                    cs.setString(2, FQty);// 设置输入参数的值  
			                    return cs;
						    }
		                 },new CallableStatementCallback(){   
		    		        public Object doInCallableStatement(CallableStatement cs)  throws  SQLException,DataAccessException {   
			                    List<String> list = new ArrayList(); 
			                    JSONObject object = null;
			        			JSONObject allResult = new JSONObject();
			        			JSONArray array = new JSONArray();
			                    boolean exist = cs.execute();  
			                    
			                    ResultSet resultSet = cs.getResultSet();  
			                    if (exist) {  
			                        while (resultSet.next()) {  
				                        object = new JSONObject();
			            				object.put("FInterID", resultSet.getString(1));
			            				object.put("FItemID", resultSet.getString(2));
			            				object.put("FNumber", resultSet.getString(3));
			            				object.put("FName", resultSet.getString(4));
			            				object.put("FQty", Double.parseDouble(resultSet.getString(5) == "" ? "0" : resultSet.getString(5)));
			            				object.put("FModel", resultSet.getString(6));
			            				object.put("td", resultSet.getString(7));
			            				object.put("FQty_PR_total", resultSet.getDouble(8));
			            				array.add(object);
			                        }  
			                    }  
			                    allResult.put("rows", "");
			            		allResult.put("values", array);
			            		return allResult.toString();
		    		         }
			          }); 
				return result;
			
		}catch(Exception e){
			e.printStackTrace();
			throw new RuntimeException("运行时出错！");
		}
	}