網(wǎng)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);
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//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(jié)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(dāng)前查詢所占用地內(nèi)存并刪除關(guān)聯(lián)資源標(biāo)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(dāng)前地數(shù)據(jù)庫版本號
echo $this->db->version();
//輸出當(dāng)前地數(shù)據(jù)庫平臺
echo $this->db->platform();
//返回最后運(yùn)行地查詢語句
echo $this->db->last_query();
//插入數(shù)據(jù)，被插入地數(shù)據(jù)會被自動轉(zhuǎn)換和過濾，例如：
//$data = array('name' => $name, 'email' => $email, 'url' => $url);
$this->db->insert_string('table_name', $data);
/*
==================================
更新操作
==================================
*/
//更新數(shù)據(jù)，被更新地數(shù)據(jù)會被自動轉(zhuǎn)換和過濾，例如：
//$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(dāng)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');
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