小编Eri*_*icC的帖子

有没有办法使用当前行作为参考来指定搜索和替换范围？我可以使用明确的行号来指定范围

:5,15s/foo/bar/g

仅在第5到第15行进行搜索和替换.如何指定"从当前行到当前行以下(或以上)10行的范围"？

使用PHP PDO for mysql更新具有空值的非可空字段时,我无法生成错误或异常.直接sql给出了预期的错误.

来自PDO的所有内容都会导致status_id字段的值设置为0,而不是异常或错误,表示该字段不允许为null.

$stmt_handler = $this->db_handler->prepare(
  "UPDATE faxes SET metadata = :metadata, status_id = :status_id, 
  created = :created, updated = :updated, content = :content, 
  vendor_fax_id = :vendor_fax_id WHERE id = :id");
$stmt_handler->bindParam(':id', $fax->id);
$stmt_handler->bindParam(':metadata', $fax->metadata);
$stmt_handler->bindParam(':status_id', $fax->status_id); // tried different combinations
$stmt_handler->bindParam(':created', $fax->created);
$stmt_handler->bindParam(':updated', $fax->updated);
$stmt_handler->bindParam(':content', $fax->content);
$stmt_handler->bindParam(':vendor_fax_id', $fax->vendor_fax_id);
$stmt_handler->execute();

我尝试了不同的组合并将PDO :: ATTR_EMULATE_PREPARES设置为false(正如此问题所建议的那样,PHP mysql PDO拒绝设置NULL值)

我的原始绑定:

bindParam(':status_id', $fax->status_id);

尝试过

bindValue(':status_id', null, PDO::PARAM_INT);
bindValue(':status_id', null, PDO::PARAM_NULL);
bindValue(':status_id', 'NULL', PDO::PARAM_INT);
bindValue(':status_id', 'NULL', PDO::PARAM_NULL);
bindValue(':status_id', null);
bindValue(':status_id', …

我试图通过引用传递一个字符串并操纵函数中的字符串:

fn manipulate(s: &mut String) {                                                                                                                                                                                                          
  // do some string manipulation, like push
  s.push('3');  // error: type `&mut collections::string::String` 
                // does not implement any method in scope named `push`
}

fn main() {
  let mut s = "This is a testing string".to_string();
  manipulate(&s);          
  println!("{}", s);       
}

我看过有关借贷和滥用的例子.也尝试了(*s).push('3'),但得到了

error: type `collections::string::String` does not implement any method in scope named `push`

我确信有一些显而易见的东西我缺失或者可能有更多参考资料要阅读,但我不知道该如何继续.谢谢!

我正在研究一个旋转了未知位数的阵列上的二进制搜索器.这是我到目前为止所拥有的:

  3 describe RotatedSortedArrayAccessor do                                                                                                                    
  4   context "Array is rotated 0 positions (i.e. not rotated)" do
  5     let(:ary) { [1,3,4,5,7,10,14,15,16,19,20,25] }
  6     it "can find every element present in the array" do
  7       ary.each_with_index do |element, index|
  8         expect(described_class.index_of(ary, element)).to eq(index)
  9       end
 10     end
 11     it "cannot find element not present in the array" do
 12       expect(described_class.index_of(ary, 13)).to eq(nil)
 13     end
 14   end
 15   context "Array is rotated a quarter of the array's length" do
 16     let(:ary) { [19,20,25,1,3,4,5,7,10,14,15,16] …