Question

我正在使用CodeIgniter v2.2.4

考虑以下代码导出/下载表示数据库查询结果的CSV文件。

CONTROLLER ：

public class AuthProvider {
  private static final AWSCredentials credentials = new BasicAWSCredentials("key1", "");

  protected AWSCredentials obtainAuth() {
    return credentials;
  }

MODEL ：

public function export_csv($id = NULL)
{   
    $this->load->dbutil();
    $this->load->helper('download');

    $query = $this->my_model->create_csv($id);  // call the model

    $data = $this->dbutil->csv_from_result($query, ',');

    force_download( $id . '.csv', $data );
}

上面的代码正常运行，但public function create_csv($id) { $this->db->from('mytable'); $this->db->where('id', $id); $this->db->select(' id AS `ID`, full_name AS `Full Name`, company_name AS `Company Name`, phone AS `Phone Number`, select_list AS `User Options` ', FALSE); return $this->db->get(); }值为select_list，0或1并且已插入CSV导出中。如何将这些值操作为最终CSV文件的更有意义的文本？

示例：

Answer 1

最简单的方法是沿着这些行使用select语句

$this->db->select(
   "id            AS `ID`,
    full_name     AS `Full Name`,
    company_name  AS `Company Name`,
    phone         AS `Phone Number`,
    CASE select_list WHEN = 1 THEN 'foo' WHEN = 2 THEN 'bar' ELSE 'N/A' END
    AS `User Options`", FALSE);

取消！这是错误的。

在CASE之后使用可选的expression时应该如下，即CASE select_list ...

$this->db->select(
   "id            AS `ID`,
    full_name     AS `Full Name`,
    company_name  AS `Company Name`,
    phone         AS `Phone Number`,
    CASE select_list WHEN 1 THEN 'foo' WHEN 2 THEN 'bar' ELSE 'N/A' END
    AS `User Options`", FALSE);

我在第一个（不正确的）示例中混合了语句可以使用的不同形式。

Answer 2

这是对我有用的确切语法......

$this->db->select("
    id            AS `ID`,
    full_name     AS `Full Name`,
    company_name  AS `Company Name`,
    phone         AS `Phone Number`,
    CASE
        WHEN select_list = 1 THEN 'foo' 
        WHEN select_list = 2 THEN 'bar' 
        ELSE 'N/A'
    END           AS `User Options`
", FALSE);

这种变化也有效......

$this->db->select("
    id            AS `ID`,
    full_name     AS `Full Name`,
    company_name  AS `Company Name`,
    phone         AS `Phone Number`,
    CASE select_list
        WHEN 1 THEN 'foo' 
        WHEN 2 THEN 'bar' 
        ELSE 'N/A'
    END           AS `User Options`
", FALSE);

导出到CSV时操纵数据？

2 个答案: