复制代码 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() 返回查询请求的字段个数
$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的内存并删除关联资源标识
$data = $query->free_result();

/*
 ==================================
 插入操作
 ==================================
*/

//上次插入操作生成的ID
echo $this->db->insert_id();

//写入和更新操作被影响的行数
echo $this->db->affected_rows();

//返回指定表的总行数
echo $this->db->count_all(\'table_name\');

//输出当前的数据库版本号
echo $this->db->version();

//输出当前的数据库平台
echo $this->db->platform();

//返回最后运行的查询语句
echo $this->db->last_query();

//插入数据，被插入的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，被更新的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
 ==================================
*/

//获取表的全部数据
$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\');

//获取字段的最大值，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\');

//获取字段的最小值
$this->db->select_min(\'age\');
$this->db->select_min(\'age\', \'nianling\');

//获取字段的和
$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\');