我查看了 CI 的手册，发现它支持这种查询绑定：
$sql = "SELECT * FROM some_table WHERE id = ? AND status = ? AND author = ?";
$this->db->query($sql, array(3, 'live', 'Rick'));
不过我更喜欢 PDO 风格：
$sql = "SELECT * FROM some_table WHERE id = :id AND status = :status AND author = :author";
通过这种方式，绑定可以更灵活，顺序无关紧要。
CI 是否支持这种绑定？
默认情况下 Codeigniter 不支持命名绑定。
因为使用命名绑定更具可读性这一事实，我“破解”了数据库类，以便它接受命名或未命名绑定。
如果有人对“黑客”感兴趣，请告诉我，我会将其上传到某个地方
我扩展了 CI_Model 以按名称执行参数查询。
class MY_Model extends CI_Model{
protected $db;
private $sql;
private $bind_marker;
public function __construct() {
$this->load->database($this->setConfigCliente());
$CI =& get_instance();
$this->db = $CI->db;
$this->bind_marker = $this->db->bind_marker;
parent::__construct();
}
public function setConfigCliente() {
// $db['hostname'] = 'localhost';
// $db['dsn'] = "mysql:host=localhost;dbname=".$this->getDbName();
$db['hostname'] = "mysql:host=localhost;dbname=".$this->getDbName();
$db['username'] = 'root';
$db['password'] = 'pass#######';
$db['database'] = $this->getDbName();
// $db['dbdriver'] = 'mysqli';
$db['dbdriver'] = 'pdo';
$db['dbprefix'] = '';
$db['pconnect'] = TRUE;
$db['db_debug'] = TRUE;
$db['cache_on'] = FALSE;
$db['cachedir'] = '';
$db['char_set'] = 'utf8';
$db['dbcollat'] = 'utf8_general_ci';
$db['swap_pre'] = '';
$db['autoinit'] = TRUE;
$db['stricton'] = FALSE;
return $db;
}
final protected function query($sql, $bind=false, $return_object = true){
$this->sql = $sql;
if(is_array($bind) and count($bind)>0){
$bind = $this->process_bind($bind);
}
$query = $this->db->query($this->sql, $bind, $return_object);
return $query;
}
private function process_bind($bind){
$bindOrder = null;
$bindList = null;
$pattern = "/[^']:[A-Za-z0-9_]+[^']/";
$preg = preg_match_all($pattern, $this->sql, $matches, PREG_OFFSET_CAPTURE);
if($preg !== 0 and $preg !== false){
foreach($matches[0] as $key=>$val){
$bindOrder[$key] = trim($val[0]);
}
foreach($bindOrder as $field){
$this->sql = str_replace($field, $this->bind_marker, $this->sql);
$bindList[] = $bind[$field];
}
}else{
$bindList = $bind;
}
return $bindList;
}
private function getDbName(){
/*
* LISTA DE NOME DE BANCO SEGUNDO O SUBDOMINIO.
*/
//AMIG
$sub['amig']['dbName'] = 'amig';
$sub['10']['dbName'] = 'amig';
//SISTEMA.ARKSYS
$sub['sistema']['dbName'] = 'sistema';
$sub['code']['dbName'] = 'sistema';
$host = explode('.', $_SERVER['HTTP_HOST']);
$subDom = $host[0];
if(isset($sub[$subDom])){
return $sub[$subDom]['dbName'];
}else{
return null;
}
}
}
示例用法：
class Login_usuarios extends MY_Model {
public function __construct() {
parent::__construct();
}
public function get_login_dados($email, $senha) {
$sql = "
SELECT
u.usu_id,
u.usu_nome,
u.usu_alterar_senha,
u.usu_situacao,
(SELECT log_data FROM log_usuario_acesso l WHERE l.usu_id = u.usu_id ORDER BY l.log_data DESC LIMIT 1) AS data_ultimo_acesso,
(SELECT
p.par_nome_fantasia
FROM
sys_parametros p
WHERE
p.par_id = 1) as par_nome_fantasia
FROM
cad_usuarios u
WHERE
u.usu_email = :usu_email
AND
u.usu_senha = :usu_senha
AND
u.usu_situacao <> :usu_situacao";
$bind[':usu_senha'] = $senha;
$bind[':usu_email'] = $email;
$bind[':usu_situacao'] = 'Descartado';
$query = $this->query($sql, $bind);
return $query->result_array();
}
}
仅由“：”标识的参数
您可以使用命名查询绑定。让我举个例子。
$sql = 'SELECT @column FROM @table LIMIT @limit';
$this->db->bind('@column', 'username');
$this->db->bind('@table', 'users');
$this->db->bind('@limit', 10);
$query = $this->db->query($sql);