Call to a member function persist() on a non-object
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Call to a member function persist() on a non-object
Symfony2 persist()成员函数
Symfony2 persist()成员函数
检查那个文件的124行呗,应该是你调用persist()方法的那个对象在前面的处理中没有成功创建.
常见是由于开发人员未对实例进行类型确认就直接调用对象方法导致的.
例如:$pdo = new PDO(); $result = $pdo->query($sql); print_r($result->fetchAll());
以上代码$pdo->query($sql)这句可能返回对象,也可能返回false(当$sql语句有问题时),应该先判断再执行后面的$result->fetchAll(),否则如果$result的值是false,那么当执行到$result->fetchAll()的时候就会看到 Call to a member function fetchAll on a non-object的错误.
常见是由于开发人员未对实例进行类型确认就直接调用对象方法导致的.
例如:$pdo = new PDO(); $result = $pdo->query($sql); print_r($result->fetchAll());
以上代码$pdo->query($sql)这句可能返回对象,也可能返回false(当$sql语句有问题时),应该先判断再执行后面的$result->fetchAll(),否则如果$result的值是false,那么当执行到$result->fetchAll()的时候就会看到 Call to a member function fetchAll on a non-object的错误.
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