Spring利用GeneratedKeyHolder,提供了一个可以返回新增记录对应主键值的方法:
int update(PreparedStatementCreator psc, KeyHolder generatedKeyHolder)
Spring为KeyHolder接口指代了一个通用的实现类GeneratedKeyHolder,该类返回新增记录时的自增长主键值。假设我们希望在新增论坛板块对象后,希望将主键值加载到对象中,则可以按以下代码进行调整:
public Permission createPermission(final Permission permission) {
final String sql = "insert into sys_permissions(permission, description, available) values(?,?,?)";
GeneratedKeyHolder keyHolder = new GeneratedKeyHolder();
jdbcTemplate.update(new PreparedStatementCreator() {
@Override
public PreparedStatement createPreparedStatement(Connection connection) throws SQLException {
PreparedStatement psst = connection.prepareStatement(sql, new String[] { "id" });
psst.setString(1, permission.getPermission());
psst.setString(2, permission.getDescription());
psst.setBoolean(3, permission.getAvailable());
return psst;
}
}, keyHolder);
permission.setId(keyHolder.getKey().longValue());
return permission;
}
相对来说,还是很好用的。