Table of Contents
1.前提
筆者要建立兩張數據表artist、track,通過觸發器TRIGGER實現artist中插入記錄時能同步到track數據庫表。
2. artist表
CREATE TABLE artist(
artistid INTEGER PRIMARY KEY,
artistname TEXT
)
3. track表
CREATE TABLE track(
trackid INTEGER,
trackname TEXT,
trackartist INTEGER,
FOREIGN KEY(trackartist) REFERENCES artist(artistid)
)
4. 觸發器創建
CREATE TRIGGER artist_trigger_insert AFTER INSERT
ON artist
BEGIN
INSERT INTO track VALUES((SELECT artistid FROM artist order by artistid desc limit 0, 1 ), "trigger", (SELECT artistid FROM artist order by artistid desc limit 0, 1 ));
END
創建artist_trigger_insert觸發器,當表artist執行INSERT命令後,觸發器執行BEGIN....END之間的語句,即將artist表中的最後一條記錄插入到track中,接下來看下筆者的測試結果:
分別在trist表插入兩組數據,觀察到track也被觸發器同步寫了