Question

我想制作可选的sql查询参数，问题是当$param['a']和$param['b']都为真时。然后$ query看起来像这个SELECT * from table WHERE something = TRUE AND column IS NOT NULL AND column IS NULL)。我怎么解决这个问题？

switch($param)
{
  case $param['a']:
    $query = "AND column IS NOT NULL";
  case $param['b']:
    $query = "AND column IS NULL";
}

Answer 1

使用if条件更换开关。

通过使用if条件和连接，您可以实现所需的查询。例如，如果您有两个参数

让您初步查询

$query = 'SELECT * from table WHERE something = TRUE';
// based on the params concate conditions to initial query 
if($param['a']){
    $query .= ' AND column IS NOT NULL';
}
if($param['b']){
    $query .= ' AND column IS NULL';
}

如果两个参数都为真，则结果查询将为

SELECT * from table WHERE something = TRUE AND column IS NOT NULL AND column IS NULL

您可以根据参数添加所需的条件。

SQL查询带有可选的oposite条件

1 个答案: