SQLITE_ERROR - SQL错误或缺少数据库（接近＆＃34; RAISE＆＃34;：语法错误）

Question

我试图写下面的触发器：

CREATE TRIGGER SightingLocationError
  AFTER INSERT ON SIGHTINGS
  WHEN LOCATION NOT IN FEATURES
BEGIN
  RAISE(ABORT,
  'ERROR: Insert into SIGHTINGS table references location' + LOCATION + 'that is not found in the database.'
  );
END;

但它抛出了这个错误：

sql> CREATE TRIGGER SightingLocationError
  AFTER INSERT ON SIGHTINGS
  WHEN LOCATION NOT IN FEATURES
BEGIN
  RAISE(ABORT,
  'ERROR: Insert into SIGHTINGS table references location' + LOCATION + 'that is not found in the database.'
  );
END
[2017-12-02 13:25:12] [1] [SQLITE_ERROR] SQL error or missing database (near "RAISE": syntax error)

我尝试过不同的方式格式化字符串并更改查询，但无论我尝试什么，我都会遇到同样的错误。任何人都可以告诉我我的代码有什么问题吗？