@Override // 在执行关注之前先判断用户是否已被关注
public void addFocusUser(long userId, long focusUserId) throws SQLException {
QueryRunner queryRunner = new QueryRunner(DbTools.getDatasource());
String sql = "insert into focus(user_id,Use_user_id) values(?,?)";
Object[] param = {userId, focusUserId};
queryRunner.update(sql, param);
}
@Override
public void cancerFocusUser(long userId, long focusUserId) throws SQLException {
QueryRunner queryRunner = new QueryRunner(DbTools.getDatasource());
String sql = "delete from focus where user_id=? and Use_user_id=? ";
Object[] param = {userId, focusUserId};
queryRunner.update(sql, param);
}
/**
* 没有关注user 返回值为0，否则返回被关注者的id
*
* @param userId
* @return
* @throws SQLException
*/
@Override
public List<Long> getFocusUserId(long userId) throws SQLException {
QueryRunner queryRunner = new QueryRunner(DbTools.getDatasource());
String sql = "select Use_user_id from focus where user_id=?";
Object[] param = {userId};
List ls = queryRunner.query(sql, new ArrayListHandler(), param);
List<Long> focusUserId = new ArrayList<>();
for (Object obj : ls) {
Object[] objs = (Object[]) obj;
String s = objs[0] + "";
focusUserId.add(Long.parseLong(s));
}
return focusUserId;
}