SQLite外键问题

Question

我有两个定义如下的表； 当我通过执行DELETE命令从SQL Manager的RELHOSPOL中删除行时，它将使USER表上的必要行为空。 每当我使用下面编写的方法从应用程序中删除行时，它只会从RELHOSPOL中删除行，而不会在USER表中将必要的行设置为NULL。 遗漏点是什么？

CREATE TABLE [USER] (
  [ID] INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, 
  [GROUPID] INTEGER CONSTRAINT [FK_USER_GID] REFERENCES [GROUP]([ID]) ON DELETE SET NULL ON UPDATE CASCADE, 
  [HOSPITALID] INTEGER, 
  [POLIKLINIKID] INTEGER, 
  [NAME] VARCHAR(50) NOT NULL, 
  [LOGINID] VARCHAR(15) NOT NULL, 
  [EMAIL] VARCHAR(50) NOT NULL, 
  [PASSWORD] VARCHAR(32) NOT NULL, 
  CONSTRAINT [FK_USER_RELHOSPOL] FOREIGN KEY([HOSPITALID], [POLIKLINIKID]) REFERENCES [RELHOSPOL]([HOSPITALID], [POLIKLINIKID]) ON DELETE SET NULL ON UPDATE CASCADE);

CREATE UNIQUE INDEX [AS] ON [USER] ([LOGINID]);
CREATE UNIQUE INDEX [AS1] ON [USER] ([EMAIL]));

CREATE TABLE [RELHOSPOL] (
  [ID] INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, 
  [HOSPITALID] INTEGER, 
  [POLIKLINIKID] INTEGER);

CREATE UNIQUE INDEX [UNIQUE_RELHOSPOL] ON [RELHOSPOL] ([HOSPITALID], [POLIKLINIKID]);

public void deletePoliklinikFromHospital(int hospitalId, int poliklinikId) throws SQLException{

        String query = "DELETE FROM [RELHOSPOL] WHERE (HOSPITALID = ? AND POLIKLINIKID = ?)";
        try {
            PreparedStatement statement = db.prepareStatement(query);
            statement.setInt(1, hospitalId);
            statement.setInt(2, poliklinikId);
            statement.executeUpdate();
        } catch (SQLException e) {
            throw new SQLException(e.getMessage());
        }
    }

Answer 1

您需要打开外键强制实施，由于向后兼容，默认情况下该功能处于关闭状态。 这是每个连接的配置选项。 添加为你做的，一旦你已经做出了第一件事情之一Connection ：

PRAGMA foreign_keys = on;