使用Spring jdbc template调用Sybase带有返回结果集的储存过程-要点
google半天，没找到有人写者方面的，我就开个头吧。有不对的地方还请大侠们拍砖。要点其实很简单，就是把在declareParameter时要先声明返回结果集参数，再声明input参数。
先看看程序吧：
Sybase 存储过程
IF OBJECT_ID('dbo.sp_xx') IS NOT NULLBEGIN DROP PROCEDURE dbo.sp_xx IF OBJECT_ID('dbo.sp_xx') IS NOT NULL PRINT '<<< FAILED DROPPING PROCEDURE dbo.sp_xx >>>' ELSE PRINT '<<< DROPPED PROCEDURE dbo.sp_xx >>>'ENDgocreate proc sp_xx ( @userid int) asbegin select personid, personname from person where personid = @userid select teamid, teamname from teamend EXEC sp_procxmode 'dbo.sp_xx','unchained'go
正确的java调用程序如下
private class ProcWithResultSet extends StoredProcedure { public ProcWithResultSet(DataSource dataSource) { setDataSource(dataSource); setSql("sp_xx"); //declareParameter(new SqlParameter("userid", java.sql.Types.INTEGER)); //(1) //declare the first out param in the sp, the name rsPerson is the key of result map declareParameter(new SqlReturnResultSet("rsPerson", new PersonRowMapper())); //declare the second out param in the sp, the name rsTeam is the key of result map declareParameter(new SqlReturnResultSet("rsTeam", new TeamRowMapper())); //declare input params, the name userid is the IN params of the param declareParameter(new SqlParameter("userid", java.sql.Types.INTEGER)); //(2) compile(); } public Map getRsFromSP(int userID) { Map map = new HashMap(); map.put("userid", new Integer(userID)); return execute(map); } } private class PersonRowMapper implements RowMapper {public Object mapRow(ResultSet rs, int rowNum) throws SQLException{UserInfo u = new UserInfo();u.setPersonID(rs.getInt(1));u.setUserName(rs.getString(2));return u;} } private class TeamRowMapper implements RowMapper {public Object mapRow(ResultSet rs, int rowNum) throws SQLException{return new PropertyValue(rs.getInt(1)+"", rs.getString(2));} }
Spring中对于jdbc 调用带有返回结果集的存储过程是用的这个方法。
/** * Extract returned ResultSets from the completed stored procedure. * @param cs JDBC wrapper for the stored procedure * @param parameters Parameter list for the stored procedure * @return Map that contains returned results */protected Map extractReturnedResultSets(CallableStatement cs, List parameters, int updateCount)throws SQLException {Map returnedResults = new HashMap();int rsIndex = 0; boolean moreResults;do {if (updateCount == -1) { //(3)Object param = null;if (parameters != null && parameters.size() > rsIndex) {param = parameters.get(rsIndex); //(4)}if (param instanceof SqlReturnResultSet) {SqlReturnResultSet rsParam = (SqlReturnResultSet) param;returnedResults.putAll(processResultSet(cs.getResultSet(), rsParam)); //(5)}else {logger.warn("Results returned from stored procedure but a corresponding " +"SqlOutParameter/SqlReturnResultSet parameter was not declared");}rsIndex++;}moreResults = cs.getMoreResults(); //(6)updateCount = cs.getUpdateCount();if (logger.isDebugEnabled()) {logger.debug("CallableStatement.getUpdateCount() returned " + updateCount);}}while (moreResults || updateCount != -1);return returnedResults;}
原因分析：
1：Sybase不支持Out 参数返回结果集。只能再Sp当中最后select column from some table
2：Sybase的JDBC Driver对于jdbc的实现比较令人费解，如果一个Sp返回多个结果集，如果不调用第一个结果集即statement.getResultSet()
那么接下来statementcs.getMoreResults()会返回False,即使有有第二个返回结果集，它一样返回false,那么Spring就会把返回结果认为是一个update的
结果，就不会对其它结果集进行处理。
3：Spring中如果jdbc返回结果集，那么程序会执行到(3)处，这里rsIndex = 0，如果输入参数声明在先，那么这里得到的将会是输入参数，
(5)处的cs.getResultSet()将不会被执行，第一个ResultSet不会被处理，同时，因为(5)处没有被执行，那么(6)处会返回false,也就是解下来
的结果集不会被正确的认出来，Spring也不会去处理后续的结果集，这样就一个结果集也得不到了。
4：这里主要还是Sybase jdbcDriver在实现jdbc时有bug,但是我们只能顺着人家来，在用Spring Jdbctemplate调用时注意一下了。
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