如何查询列表< String>在jdbctemplate中 [英] how to query for a list<String> in jdbctemplate

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问题描述

我正在使用spring jdbctemplate并运行如下查询:

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

SELECT COLNAME FROM TABLEA GROUP BY COLNAME

没有传递任何命名参数,但是,用户将传递列名 COLNAME

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

问题


  1. 有吗如何为列名提供占位符,例如?例如 SELECT? FROM TABLEA GROUP BY?

如果我想简单地运行上述查询并获得 List<字符串> 最好的方法是什么?

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

目前我正在做:

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


推荐答案


有没有办法有占位符,比如?列名?例如SELECT? FROM TABLEA GROUP BY?

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

使用动态查询,如下所示:

Use dynamic query as below:

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




如果我想简单地运行上面的查询并得到一个List是最好的方法吗?

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);
                            }
                       });

编辑:要停止SQL注入,请检查colName中的非单词字符:

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
          }

这篇关于如何查询列表&lt; String&gt;在jdbctemplate中的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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