java servlet调用带有多个返回结果集的存储过程
推荐回答(1个)
一、mysql存储过程
这里我先说下我这个功能实现的逻辑及途中遇到的一些问题。这个存储过程一共带两个输入参数,一共关联到两张表的查询,每个参数都对应查询表中的一个判断,所以一共返回了两个结果集(当然要返回更多结果集也是一样的,如果需要判断,就继续增加存储过程参数,如果不需要判断就直接在存储过程中,增加查询的SQL语句即可)。实现这个功能还有更简单的方法,可以写SQL关联语句查询出两张表的结果,返回一个组合的结果集。我这里当然是为了实现这个效果,所以把它的实现复杂化了。继续说下我今天在mysql上遇到的一个问题,究竟是什么原因,其实我现在也没弄清楚,写这个存储过程前,我给要查询的表中增加了两个字段,然后修改了一个字段的名称,增加的字段到没有任何影响,但是修改过名称的字段就出问题了,在java中调用这个存储过程时,就提示这个字段不存在。之后我将这个修改过的字段再修改回去就好了,下面贴存储过程代码。
1、参数
in sheetOneAccount varchar(50),in sheetTwoAccount varchar(50)
2、代码
1 BEGIN 2 /*存储过程*/ 3 declare shareNameIsOrNoExistsVerify varchar(50); 4 /*验证第一个参数在第一张表中是否存在*/ 5 SELECT name into shareNameIsOrNoExistsVerify from infosheet 6 where sheetOneAccount=name; 7 if(shareNameIsOrNoExistsVerify is not null) THEN 8 /*这里给返回的查询结果表中增加了一个字段,以便客户端接受到之后,首先取这个字段的 9 值来判断,查询这个用户是否存在,如果存在才去取对应字段的值,减少了客户端的工作量*/10 /*这里nameExists AS 0表示用户存在与表中,而且表示第一张表*/11 select *, 0 AS nameExists from infosheet where name=sheetOneAccount;12 ELSE 13 /*下面查询人员不存在,返回的自定义字段值就为1, 1 AS nameExists,表示查询用户不存在,14 而且表示第一张表 */15 16 /*下面表示没查询到该人员,虽然没查询到但是还是返回了一条数据,所以在取值时,需要先取nameExists 这个字段17 判断查询的人员是否存在*/18 select name,1 AS nameExists from infosheet limit 0,1;19 end if;20 /*验证第二个参数在第二张表中是否存在*/21 set shareNameIsOrNoExistsVerify=null;22 SELECT name into shareNameIsOrNoExistsVerify from studentsheet23 where name=sheetTwoAccount;24 if(shareNameIsOrNoExistsVerify is not null) THEN25 /*这里给返回的查询结果表中增加了一个字段,以便客户端接受到之后,首先取这个字段的26 值来判断,查询这个用户是否存在,如果存在才去取对应字段的值,减少了客户端的工作量*/27 /*这里nameExists AS 2表示用户存在于表中,而且表示第二张表*/28 select *, 2 AS nameExists from studentsheet where name=sheetTwoAccount;29 ELSE 30 /*不存在返回的自定义字段值就为3, 3 AS nameExists,表示查询用户不存在,31 而且表示第二张表 */32 33 /*下面表示没查询到该人员,虽然没查询到但是还是返回了一条数据,所以在取值时,需要先取nameExists 这个字段34 判断查询的人员是否存在*/35 select name,3 AS nameExists from studentsheet limit 0,1;36 end if;37 END
一、java Servlet
1、调用存储过程方法
1 //调用带有多个返回结果集的存储过程 2 //这里虽然是查询的结果集,但是我在数据库中写的判断是,只查询出一条数据,所以也不需要在方法中使用re.next遍历 3 public static JSONArray callProcReturnMultipleSet(String sql, String[] parameters) { 4 JSONArray masterJSONArray = new JSONArray(); 5 JSONObject shareJSONObject=new JSONObject(); 6 try { 7 conn = getConnection(); 8 cs = conn.prepareCall(sql);
9 for(int i=0;i12 }13 cs.execute();14 rs = cs.getResultSet();15 //如果是返回的多条数据这里,需要用JSONArray来接收。16 shareJSONObject= ResultToJsonTool.resultSetToJsonObject(rs);17 masterJSONArray.put(shareJSONObject);18 19 //下面这个方法就是继续循环出rs中的数据集表,java这个功能做都没.NET好,.NET返回一个dataSet直接用下标取对应的数据集20 //如果你还在查询中增加了更多的表没那么继续用下面这个方法循环出数据集21 if (cs.getMoreResults() == true) {22 rs = cs.getResultSet();23 shareJSONObject= ResultToJsonTool.resultSetToJsonObject(rs);24 masterJSONArray.put(shareJSONObject);25 //下面如果有第三方那个表,以此类推,同样的方法,或则这里自己可以写一个递归的方法封装下少些代码26 //if (cs.getMoreResults() == true) {27 28 // }29 30 }
31 32 33 }34 catch (Exception e) {35 e.printStackTrace();36 throw new RuntimeException(e.getMessage());37 }finally{38 39 }40 return masterJSONArray;41 }
2、调用
1 //调用返回多个结果集的存储过程2 String[] getResultSetParameter=new String[]{"hang","haha"};3 String executProduceStr="call getMultipleResultSetProcudure(?,?)";4 JSONArray rest=(JSONArray) MySqlHepler.callProcReturnMultipleSet(executProduceStr, getResultSetParameter);5 out.println(rest.toString());
3、实现截图
由于本人也是才开始学java,如有不合理之处,请及时指出。
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