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是你語法錯了

$sql = "SELECT `id`,`content` FROM `dr_1_news_data_0`";
$data = $this->db->query($sql)->result_array();
foreach ($data as $r) {
    echo $r['id'];
    echo $r['content'];
}

我推薦你用這種

$data = $this->db->get('1_news_data_0')->result_array();
foreach ($data as $r) {
    echo $r['id'];
    echo $r['content'];
}

都是ci框架的語法，看ci框架手冊就行

http://www.poscms.net/dev-doc/database/results.html

這里的語法