Question

我有很长的多个SQL查询，需要多次使用不同的ID。我认为将这些查询放在方法中的数组中会更好，这样我就可以随时调用它。

问题是，我试图将ID变量放入查询中时遇到困难。简单来说，代码是这样的：

class SqlQueries {

  protected $_queries;

  private function $_queriesArr() {
    $_queries = array(
                  "SELECT * FROM tbl_a WHERE id = $id_a",
                  "UPDATE tbl_b SET b = NULL WHERE id = $id_b",
                  "UPDATE tbl_c SET c = NULL WHERE id = $id_c",
                );
    return $_queries;
  }

  public function $callQuery() {
    $id_a = 2;
    $tbl_a = $this->$_queriesArr();
    return $tbl_a[0];
  }

  public function $mainMethod() {
    echo $this->callQuery();
  }

}

我总是在查询中遇到错误。

Answer 1

如何添加这样的参数，但为什么命名函数以$开头？顺便说一下，只需在您的函数中添加参数，并希望它能够正常运行

private function queriesArr($id_a, $id_b, $id_c) {
    $_queries = array(
                  "SELECT * FROM tbl_a WHERE id = $id_a",
                  "UPDATE tbl_b SET b = NULL WHERE id = $id_b",
                  "UPDATE tbl_c SET c = NULL WHERE id = $id_c",
                );
    return $_queries;
  }

Answer 2

class SqlQueries {

protected $_queries;

private function $_queriesArr($id_a='', $id_b='', $id_c='') {
$_queries = array(
              "SELECT * FROM tbl_a WHERE id = '".$id_a."' ",
              "UPDATE tbl_b SET b = NULL WHERE id = '".$id_b."' ",
              "UPDATE tbl_c SET c = NULL WHERE id = '".$id_c."' ",
            );
return $_queries;
}

public function $callQuery() {
   $id_a = 2;
   $tbl_a = $this->$_queriesArr($id_a);
   return $tbl_a[0];
}

public function $mainMethod() {
   echo $this->callQuery();
}

}

如何在方法中传递数组中的变量？

2 个答案: