Question

在我的NodeJS应用程序中使用pg，我希望能够将数组传递给函数，以便可以将IN语句用作查询的一部分

示例

async function myMethod(array) {
  // array looks like [ '83', '82', '54', '55', '79' ] for example
  let response;
  try {
    response = await pool.query("SELECT * FROM fixtures WHERE id IN($1)", [array]);
  } catch (e) {
    console.log(e);
  }
  return response.rows;
}

我遇到错误

{ error: invalid input syntax for integer: "{"83","82","54","55","79"}"

请问如何在这里构建查询结构？

Answer 1

您最好的选择是：

private var sectionIndices: [String] = ["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z","#"]

for beginningLetter in self.sectionIndices {
  print("Finding artists for \(beginningLetter)")
  let artists: Results<Artist>
  if beginningLetter == "#" {
    artists = self.artists.filter(startsWithNumberPredicate, self.sectionIndices)
  } else {
    artists = self.artists.filter("name BEGINSWITH[cd] %@", beginningLetter).sorted(byKeyPath: "name", ascending: true)
  }
}

当变量以pool.query("SELECT * FROM fixtures WHERE id IN($1:list)", [array]); // [1,2,3]→"SELECT * FROM fixtures WHERE id IN(1,2,3)"结尾时，其格式设置为逗号分隔值的列表，每个值的格式均取决于其JavaScript类型。

您需要这样做的原因是，默认情况下将数组格式化为PostgreSQL数组，这就像用花括号表示的那样。

注意：此内容已在v7.5.1中添加到:list（或更确切地说，pg）中。如果您使用的是早期版本，请改用pg-promise。

来源：pg-promise#csv-filter

将数组传递给函数-PG和NodeJS

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