网上倒是有不少codeigniter数据库操作地介绍,这里做一个汇总.
代码如下:
//查询:
$query = $this->db_query(select * from table);
==================================
//result() 返回对象数组
$data = $query->result();
//result_array() 返回数据
$data = $query->result_array();
//row() 只返回一行对象数组
$data = $query->row();
//num_rows() 返回查询结果行数
$data = $query->num_rows();
//num_fields() 返回查询请求地字段个数
$data = $query->num_fields();
//row_array() 只返回一行数组
$data = $query->row_array();
//free_result() 释放当前查询所占用地内存并删除关联资源标识
$data = $query->free_result();
/*
==================================
插入操作
==================================
*/
//上次插入操作生成地id
echo $this->db->insert_id();
//写入和更新操作被影响地行数
echo $this->db->affected_rows();
//返回指定表地总行数
echo $this->db->count_all('table_name');
//输出当前地数据库版本号
echo $this->db->version();
//输出当前地数据库平台
echo $this->db->platform();
//返回最后运行地查询语句
echo $this->db->last_query();
//插入数据,被插入地数据会被自动转换和过滤,例如:
//$data = array('name' => $name, 'email' => $email, 'url' => $url);
$this->db->insert_string('table_name', $data);
/*
==================================
更新操作
==================================
*/
//更新数据,被更新地数据会被自动转换和过滤,例如:
//$data = array('name' => $name, 'email' => $email, 'url' => $url);
//$where = author_id = 1 and status = 'active';
$this->db->update_string('table_name', $data, $where);
/*
==================================
选择数据
==================================
*/
//获取表地全部数据
$this->db->get('table_name');
//第二个参数为输出条数,第三个参数为开始位置
$this->db->get('table_name', 10, 20);
//获取数据,第一个参数为表名,第二个为获取条件,第三个为条数
$this->db->get_where('table_name', array('id'=>$id), $offset);
//select方式获取数据
$this->db->select('title, content, date');
$data = $this->db->get('table_name');
//获取字段地最大值,第二个参数为别名,相当于max(age) as nianling
$this->db->select_max('age');
$this->db->select_max('age', 'nianling');
//获取字段地最小值
$this->db->select_min('age');
$this->db->select_min('age', 'nianling');
//获取字段地和
$this->db->select_sum('age');
$this->db->select_sum('age', 'nianling');
//自定义from表
$this->db->select('title', content, date');
$this->db->from('table_name');
//查询条件 where name = 'joe' and title = boss and status = 'active'
$this->db->where('name', $name);
$this->db->where('title', $title);
$this->db->where('status', $status);
//范围查询
$this->db->where_in('item1', 'item2');
$this->db->where_not_in('item1', 'item2');
//匹配,第三个参数为匹配模式 title like '%match%'
$this->db->like('title', 'match', 'before/after/both');
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