application/config文件夾下的database.php文件
$db['default'] = array('dsn' => 'mysql:dbname=ci_ecshop;host=127.0.0.1',
'username' => 'root',
'password' => '',
'dbdriver' => 'pdo',
2、查詢操作
$sql = 'select * from aaa where id = :id';
$sql_array = array(
':id' => 1
);
$stmt = <span style="color:#FF0000;">$this->db->conn_id</span>->prepare($sql);//<span style="color:#FF6600;">$this->db->conn_id 是一個pdo對象</span>
$stmt->execute($sql_array);
$arr_user = $stmt->fetchAll(PDO::FETCH_ASSOC); //返回一個包含結果集中所有行的數組,相當於mysql中的result_array
$str_user = $stmt->fetch(PDO::FETCH_ASSOC); //從結果集中獲取下一行,相當於mysql中的row_array
判斷查詢是否成功:
$stmt->execute($sql_array); //這句語句會返回true或者false,代表查詢是否成功
3、insert 、update、delete 等操作
除了sql語句語法不同,查詢的方法是一樣的
$sql = "update aaa SET status = -1 WHERE id= :id";
$sql = "INSERT INTO aaa(`id`) VALUES ( :id)";
$sql = "delete from aaa where id= :id";
$sql_array = array(
':id' => 1
);
$stmt = $this->db->conn_id->prepare($sql);
$stmt->execute($sql_array);
判斷查詢是否成功:
$stmt->rowCount();
if($stmt->rowCount()>0){
//查詢成功
}else{
//查詢失敗
}
4、另外,insert的時候,有時候需要返回insert_id
pdo中的寫法是 $stmt->lastInsertId();