8.5.1. execute

8.5.2. queryForInt

8.5.3. queryForObject

                Integer age = queryForObject("select age from emp", Integer.class);String name = queryForObject("select name from emp",String.class);

               private double getSumByMemberId(int memberId) {double result = 0.0d;String sql = "SELECT sum(o.price::NUMERIC) as total FROM public.order o group by member_id ="+ memberId;try {result = jdbcTemplate.queryForObject(sql, Double.class);} catch (org.springframework.dao.EmptyResultDataAccessException e) {log.info("{} {}", MemberId, e.toString());}return result;}

注意 Date 是 java.util 不是 java.sql

          private static final Logger log = LoggerFactory.getLogger(ScheduledTasks.class);private static final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-mm-dd HH:mm:ss");@Autowiredprivate JdbcTemplate jdbcTemplate;@Scheduled(initialDelay = 1000, fixedRate = 60000)public void currentDate() {Date date = jdbcTemplate.queryForObject("select sysdate from dual", Date.class);log.info("The oracle sysdate is {}", dateFormat.format(date));}

                @Autowiredprivate JdbcTemplate jdbcTemplate;@RequestMapping(value = "/article")public @ResponseBody String dailyStats(@RequestParam Integer id) {String query = "SELECT id, title, content from article where id = " + id;return jdbcTemplate.queryForObject(query, (resultSet, i) -> {System.out.println(resultSet.getLong(1) + "," + resultSet.getString(2) + "," + resultSet.getString(3));return (resultSet.getLong(1) + "," + resultSet.getString(2) + "," + resultSet.getString(3));});}           

package com.example.api.restful;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;import com.example.api.pojo.ResponseRestful;@RestController
@RequestMapping("/restful/cms")
public class CmsRestController {@Autowiredprivate JdbcTemplate jdbcTemplate;@RequestMapping(value = "/article/update/count/{articleId}", method = RequestMethod.GET, produces = { "application/xml", "application/json" })public ResponseRestful updateCount(@PathVariable int articleId) {String sql = "SELECT count(*) FROM cms.article WHERE id > ?";int count = jdbcTemplate.queryForObject(sql, new Object[] { articleId }, Integer.class);return new ResponseRestful(true, 1, "文章更新", count);}
}

package cn.netkiller.model;import java.sql.ResultSet;
import java.sql.SQLException;import org.springframework.jdbc.core.RowMapper;public class CustomerRowMapper implements RowMapper
{public Object mapRow(ResultSet rs, int rowNum) throws SQLException {Customer customer = new Customer();customer.setId(rs.getInt("ID"));customer.setName(rs.getString("NAME"));customer.setAge(rs.getInt("AGE"));return customer;}}

public Customer findByCustomerId(int id){String sql = "SELECT * FROM CUSTOMER WHERE ID = ?";Customer customer = (Customer)getJdbcTemplate().queryForObject(sql, new Object[] { id }, new CustomerRowMapper());return customer;
}

Member member = this.jdbcTemplate.queryForObject("select first_name, last_name from member where id = ?",new Object[]{112L},
new RowMapper<Member>() {public Actor mapRow(ResultSet rs, int rowNum) throws SQLException {Member member = new Member();member.setFirstName(rs.getString("first_name"));member.setLastName(rs.getString("last_name"));return member;}
});

8.5.4. queryForList

8.5.5. queryForMap

8.5.6. query

HashMap<String,String> member = jdbcTemplate.query("select name,age from member where id=1", (ResultSet rs) -> {HashMap<String,String> results = new HashMap<>();while (rs.next()) {results.put(rs.getString("name"), rs.getString("age"));}return results;
}); 

ResultSetExtractor

HashMap<String,String> member = jdbcTemplate.query("select name,age from member where id=1", new ResultSetExtractor<Map>(){@Overridepublic Map extractData(ResultSet rs) throws SQLException,DataAccessException {HashMap<String,String> mapResult= new HashMap<String,String>();while(rs.next()){mapResult.put(rs.getString("name"),rs.getString("age"));}return mapResult;}
});

List<Actor> actors = this.jdbcTemplate.query("select first_name, last_name from actor",new RowMapper<Actor>() {public Actor mapRow(ResultSet rs, int rowNum) throws SQLException {Actor actor = new Actor();actor.setFirstName(rs.getString("first_name"));actor.setLastName(rs.getString("last_name"));return actor;}
});

public List<Actor> findAllActors() {return this.jdbcTemplate.query( "select first_name, last_name from actor", new ActorMapper());
}private static final class ActorMapper implements RowMapper<Actor> {public Actor mapRow(ResultSet rs, int rowNum) throws SQLException {Actor actor = new Actor();actor.setFirstName(rs.getString("first_name"));actor.setLastName(rs.getString("last_name"));return actor;}
}

8.5.7. queryForRowSet

8.5.8. update