How to get Map data using JDBCTemplate.queryForMap

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自闭症患者 2020-12-13 09:14

How to load data from JDBCTemplate.queryForMap() and it returns the Map Interface.How the maintained the query data internally in map.I trying to load but i go

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余生分开走 (楼主)

2020-12-13 09:33
I know this is really old, but this is the simplest way to query for Map.

Simply implement the ResultSetExtractor interface to define what type you want to return. Below is an example of how to use this. You'll be mapping it manually, but for a simple map, it should be straightforward.
```
jdbcTemplate.query("select string1,string2 from table where x=1", new ResultSetExtractor(){
    @Override
    public Map extractData(ResultSet rs) throws SQLException,DataAccessException {
        HashMap mapRet= new HashMap();
        while(rs.next()){
            mapRet.put(rs.getString("string1"),rs.getString("string2"));
        }
        return mapRet;
    }
});
```
This will give you a return type of Map that has multiple rows (however many your query returned) and not a list of Maps. You can view the ResultSetExtractor docs here: http://docs.spring.io/spring-framework/docs/2.5.6/api/org/springframework/jdbc/core/ResultSetExtractor.html
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