问题创造触发

Question

我创建一个触发器，但得到这个错误：

android.database.sqlite.SQLiteException: near "CREATE": syntax error: CREATE TRIGGER fk_item_place BEFORE INSERT ON CREATE TABLE Item_Place(PlaceIDfk INTEGER ,ItemID NTEGER , FOREIGN KEY (PlaceIDfk) REFERENCES Place_Table(Place_ID) ON DELETE CASCADE FOREIGN KEY (ItemID) REFERENCES ContentTable(ContentID)); FOR EACH ROW BEGIN SELECT CASE WHEN ((SELECT Place_ID FROM Place_Table WHERE Place_ID=new.PlaceIDfk) IS NULL) THEN RAISE (ABORT,'Foreign Key Violation') END ; END ;

我的代码是这样的：

db.execSQL("CREATE TRIGGER fk_item_place " + 
      " BEFORE INSERT "+ 
      " ON "+ Item_places + 
      " FOR EACH ROW BEGIN "+ 
      " SELECT CASE WHEN ((SELECT "+ PlaceID +" FROM "+ PlaceTable +" WHERE "+ PlaceID +"=new." + place_id + ") IS NULL)"+ 
      " THEN RAISE (ABORT,'Foreign Key Violation') END ;" + 
      " END ;"); 

我在做什么错？

Answer 1

您不能有一个ON CREATE TABLE触发器。确保Item_places是表名，而不是DDL。