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SQLiteÓô¥·¢Æ÷À´Ìæ´úÍâ¼üÔ¼Êø CREATE TABLE [Category] (
  [Pkid] INTEGER  PRIMARY KEY AUTOINCREMENT NOT NULL,
  [CategoryName] NVARCHAR(32)  NOT NULL,
  [CategoryGuid] char(36)  UNIQUE NOT NULL,
  [CategoryDesc] nvarchar(256)  NULL
) CREATE TABLE [Product] (
  [Pkid] INTEGER  PRIMARY KEY AUTOINCREMENT NOT NULL,
  [CategoryPkid] INTEGER  NOT NULL,
  [ProductName] nvarchar(32)  NULL,
  [ProductPrice] NUMERIC(19,4) DEFAULT '0.00' NOT NULL
)   --InsertÔ¼Êø
CREATE TRIGGER FK_Product_CategoryPkid_Insert
BEFORE Insert ON Product
FOR EACH ROW BEGIN
  SELECT RAISE(ROLLBACK,'No this categoryPkid in category')
  WHERE (SELECT Pkid from Category WHERE Pkid = NEW.CategoryPkid) IS NULL;
END --UpdateÔ¼Êø
CREATE TRIGGER FK_Product_CategoryPkid_Update
BEFORE Update ON Product
FOR EACH ROW BEGIN
  SELECT RAISE(ROLLBACK,'No this categoryPkid in category')
  WHERE (SELECT Pkid from Category WHERE Pkid = NEW.CategoryPkid) IS NULL;
END


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