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  • CI DB类

    CI DB类    
    链接数据库
    -------
    $this->load->database();//手动连接数据库
    //连接多数据库
    $DB1 = $this->load->database('group_one', TRUE);
    $DB2 = $this->load->database('group_two', TRUE);
    -----------------------------------------------------
    查询
    -------
    //参数绑定形式
    $sql = "SELECT * FROM some_table WHERE id = ? AND status = ? AND author = ?";
    $this->db->query($sql, array(3, 'live', 'Rick'));
    //多结果标准查询
    $query = $this->db->query($sql); //自定义
    $query = $this->db->get('tablename'); //便捷形式,相当于:SELECT * FROM tablename
    $query = $this->db->get('tablename', 10, 20); // 相当于: SELECT * FROM tablename LIMIT 20, 10
    $query->result() //对象形式
    $query->result_array() //数组形式
    
    $query->num_rows() //总条数
    $query->num_fields() //字段数
    //单结果标准查询
    $row = $query->row(); //对象形式
    $row = $query->row_array(); //数组形式
    
    -----------------------------------------------------
    插入
    -------
    $data = array(
                                    'title' => $title,
                                    'name' => $name
                                    );
    $this->db->insert('tablename', $data); //便捷插入
    $this->db->insert_string('tablename', $data);  //便捷插入
    $this->db->insert_id() //刚插入的id
    $this->db->affected_rows() //影响的行数(update,insert)
    -----------------------------------------------------
    更新
    -------
    $data = array(
                                    'name' => $name,
                                    'email' => $email
                                    );
    $where = "id = 1";
    $this->db->update('tablename', $data);
    $this->db->update_string('tablename', $data, $where);
    -----------------------------------------------------
    删除
    -------
    $array = array(
                                    'name' => $name,
                                    'title' => $title
                                    );
    $this->db->delete('tablename', $array);
    // Produces:
    // "DELETE FROM tablename WHERE name = '$name' AND title = '$title'"
    $this->db->truncate('tablename'); //清空表
    // Produce: TRUNCATE tablename
    -----------------------------------------------------
    (where)
    -------
    $array = array(
                                    'name' => $name,
                                    'title' => $title
                                    );
    $this->db->where($array);
    // Produces: "WHERE name = '$name' AND title = '$title'"
    -----------------------------------------------------
    $this->db->count_all('tablename'); //表中记录总行数
    -----------------------------------------------------
    $query->free_result() //释放资源 
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  • 原文地址:https://www.cnblogs.com/yifenghong/p/2628597.html
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