在 Firebird 存储过程中选择标量值

Question

我想从 Firebird 2.1 存储过程中获取特定行的 ID。我似乎不记得语法了，这让我发疯了。

这是代码在 Microsoft SQL Server 使用的 TSQL 中的外观。

    @ID = SELECT ID FROM ADDRESS WHERE 
      POBox = :POBOX AND
      ExtendedAddress = :EXTENDEDADDRESS AND
      StreetAddress = :STREETADDRESS AND
      Locality = :LOCALITY AND
      Region = :REGION AND
      PostalCode = :POSTALCODE AND
      CountryName = :COUNTRYNAME;

Firebird 等价物是什么？

更新：Firebird SQL migration guide 表明这应该可以工作

    SELECT ID INTO :ID FROM ADDRESS WHERE 
      POBox = :POBOX AND
      ExtendedAddress = :EXTENDEDADDRESS AND
      StreetAddress = :STREETADDRESS AND
      Locality = :LOCALITY AND
      Region = :REGION AND
      PostalCode = :POSTALCODE AND
      CountryName = :COUNTRYNAME;

但是当我尝试创建存储过程时，“INTO”出现语法错误。

Answer 1

显然，Firebird 迁移指南是错误的。这种语法对我有用：

SELECT ID FROM ADDRESS WHERE 
   POBox = :POBOX AND
   ExtendedAddress = :EXTENDEDADDRESS AND
   StreetAddress = :STREETADDRESS AND
   Locality = :LOCALITY AND
   Region = :REGION AND
   PostalCode = :POSTALCODE AND
   CountryName = :COUNTRYNAME
INTO :ID;

请注意，INTO 子句必须在FROM 和WHERE 子句之后。