php - 如何将 SQL INSERT INTO SELECT 与 codeigniter 一起使用

Question

如何在 CodeIgniter 中使用 SQL 插入到 select 中。

模型...

public function history($book_id)
{


$query = $this->db->query('INSERT orders (book_id, title)
                       SELECT book_id, book_title
                       FROM books
                       WHERE book_id = \'$book_id\'');

  return true;


}

标签： phpsqlcodeigniter

Answer 1

首先从books表中获取所有书籍，然后根据您的插入顺序$book_id

例子：

public function history($book_id)
{
    $this->db->select('book_id, book_title');
    $this->db->from('books');
    $this->db->where('book_id', $book_id);
    $query = $this->db->get();

    if ( $query->num_rows() > 0 ) // if result found
    {
        $row = $query->result_array(); // get result in an array format
        $data = array();
        foreach($row as $values){
            $data = array(
                'book_id' => $values['book_id'],
                'title' => $values['book_title']
            );
            $this->db->insert('orders', $data); // insert in order table
        }
        return true;    
    }
    else{
        return false; 
    } 
}