java Spring MVC在插入记录后检索数据库自动生成的记录主密钥

Question

我正在使用JdbcTemplate。我想做的是在数据库中插入一条记录，但是表的主键设置为自动递增，因此我不必插入值，一旦完成插入，我如何检索id？。有没有一种简单的方法可以做到这一点，或者我需要做另一个查询来选择它

Jdbc插入示例

这里的公民ID是自动生成的

 public void saveCitizen(Citizens citizen) {
 logger.debug("In saveCitizens");       

int count = getJdbcTemplate().update("INSERT INTO crimetrack.tblcitizens (citizenId,fName,lName,oName,photo,countryId,addLn1, addLn2, addLn3,"
                                                +"genderId,ethnicityId, skinColorId, eyeColorId,hairColorId,occupationId,"
                                                +"phoneNo, maritalStatusId, noticableFeatures,weight,height,citizenTypeId,dob)"
                                                + "VALUES(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)"
, new Object[]{citizen.getfName(),citizen.getlName(),citizen.getoName(),
                                                citizen.getPhoto(),citizen.getCountryId(),citizen.getAddLn1(),
                                                citizen.getAddLn2(),citizen.getAddLn3(),citizen.getGenderId(),
                                                citizen.getEthnicityId(),citizen.getSkinColorId(),citizen.getEyeColorId(),
                                                citizen.getHairColorId(),citizen.getOccupationId(),citizen.getPhoneNo(),
                                                citizen.getMaritalStatusId(),citizen.getNoticeableFeatures(),
                                                citizen.getWeight(),citizen.getHeight(),citizen.getCitizenTypeId(),
                                                citizen.getDob()});

 logger.info(count +" Rows affected in tblCitizens");

Answer 1

请参见12.2.8：检索自动生成的密钥：

http://static.springsource.org/spring/docs/3.0.x/spring-framework-reference/html/jdbc.html

Answer 2

只要给出示例代码，以防链接断开。请看：

final String INSERT_SQL = "insert into my_test (name) values(?)";
final String name = "Rob";

KeyHolder keyHolder = new GeneratedKeyHolder();
jdbcTemplate.update(
    new PreparedStatementCreator() {
        public PreparedStatement createPreparedStatement(Connection connection) throws SQLException {
            PreparedStatement ps =
                connection.prepareStatement(INSERT_SQL, new String[] {"id"});
            ps.setString(1, name);
            return ps;
        }
    },
    keyHolder);

// keyHolder.getKey() now contains the generated key