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網上倒是有不少codeigniter數(shù)據(jù)庫操作地介紹，這里做一個匯總.

代碼如下:

//查詢: 

$query = $this->db_query(select * from table);

 ==================================

//result() 返回對象數(shù)組

$data = $query->result();

//result_array() 返回數(shù)據(jù)

$data = $query->result_array();

//row() 只返回一行對象數(shù)組

$data = $query->row();

//num_rows() 返回查詢結果行數(shù)

$data = $query->num_rows();

//num_fields() 返回查詢請求地字段個數(shù)

$data = $query->num_fields();

//row_array() 只返回一行數(shù)組

$data = $query->row_array();

//free_result() 釋放當前查詢所占用地內存并刪除關聯(lián)資源標識

$data = $query->free_result();

/*

 ==================================

 插入操作

 ==================================

*/

//上次插入操作生成地id

echo $this->db->insert_id();

//寫入和更新操作被影響地行數(shù)

echo $this->db->affected_rows();

//返回指定表地總行數(shù)

echo $this->db->count_all('table_name');

//輸出當前地數(shù)據(jù)庫版本號

echo $this->db->version();

//輸出當前地數(shù)據(jù)庫平臺

echo $this->db->platform();

//返回最后運行地查詢語句

echo $this->db->last_query();

//插入數(shù)據(jù)，被插入地數(shù)據(jù)會被自動轉換和過濾，例如：

//$data = array('name' => $name, 'email' => $email, 'url' => $url);

$this->db->insert_string('table_name', $data);

/*

 ==================================

 更新操作

 ==================================

*/

//更新數(shù)據(jù)，被更新地數(shù)據(jù)會被自動轉換和過濾，例如：

//$data = array('name' => $name, 'email' => $email, 'url' => $url);

//$where = author_id = 1 and status = 'active';

$this->db->update_string('table_name', $data, $where);

/*

 ==================================

 選擇數(shù)據(jù)

 ==================================

*/

//獲取表地全部數(shù)據(jù)

$this->db->get('table_name');

//第二個參數(shù)為輸出條數(shù)，第三個參數(shù)為開始位置

$this->db->get('table_name', 10, 20);

//獲取數(shù)據(jù)，第一個參數(shù)為表名，第二個為獲取條件，第三個為條數(shù)

$this->db->get_where('table_name', array('id'=>$id), $offset);

//select方式獲取數(shù)據(jù)

$this->db->select('title, content, date');

$data = $this->db->get('table_name');

//獲取字段地最大值，第二個參數(shù)為別名，相當于max(age) as nianling

$this->db->select_max('age');

$this->db->select_max('age', 'nianling');

//獲取字段地最小值

$this->db->select_min('age');

$this->db->select_min('age', 'nianling');

//獲取字段地和

$this->db->select_sum('age');

$this->db->select_sum('age', 'nianling');

//自定義from表

$this->db->select('title', content, date');

$this->db->from('table_name');

//查詢條件 where name = 'joe' and title = boss and status = 'active'

$this->db->where('name', $name);

$this->db->where('title', $title);

$this->db->where('status', $status);

//范圍查詢

$this->db->where_in('item1', 'item2');

$this->db->where_not_in('item1', 'item2');

//匹配，第三個參數(shù)為匹配模式 title like '%match%'

$this->db->like('title', 'match', 'before/after/both');

更多信息請查看IT技術專欄