how to query for a listString in jdbctemplate?--转载

原文地址：http://stackoverflow.com/questions/13354158/how-to-query-for-a-liststring-in-jdbctemplate

I'm using springs jdbctemplate and running a query like below:

SELECT COLNAME FROM TABLEA GROUP BY COLNAME

There are no named parameters being passed, however, column name, COLNAME, will be passed by the user.

Questions

Is there a way to have placeholders, like ? for column names? For example SELECT ? FROM TABLEA GROUP BY ?
If I want to simply run the above query and get a List<String> what is the best way?

Currently I'm doing:

List <Map<String, Object>> data = getJdbcTemplate().queryForList(query); for (Map m : data) System.out.println(m.get("COLNAME"));

Answers

Is there a way to have placeholders, like ? for column names? For example SELECT ? FROM TABLEA GROUP BY ?

Use dynamic query as below:

String queryString = "SELECT "+ colName+ " FROM TABLEA GROUP BY "+ colName;

If I want to simply run the above query and get a List what is the best way?

List<String> data = getJdbcTemplate().query(query, new RowMapper<String>(){ public String mapRow(ResultSet rs, int rowNum) throws SQLException { return rs.getString(1); } });

EDIT: To Stop SQL Injection, check for non word characters in the colName as :

          Pattern pattern = Pattern.compile("\\W"); if(pattern.matcher(str).find()){ //throw exception as invalid column name }

转载于:https://www.cnblogs.com/davidwang456/p/5056703.html

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how to query for a listString in jdbctemplate?--转载

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