使用觸發器計算SQLite表中的運行總數

Question

如何創建SQLite觸發器來計算「實際」表上的運行總數？以下SQL代碼應更新AccountBalances表，以便餘額列從1,2,3，... rowcount開始計數。但是，即使啓用了recursive_triggers，觸發器也只會更新第二行。以下結果是第1行= 1，第2行= 2，之後的行爲空。

CREATE TEMP TABLE "AccountBalances" (
    "Id" INTEGER PRIMARY KEY, 
    "DateId" INT, 
    "AccountId" INT, 
    "AccountCurrAmount" REAL, 
    "Balance" REAL); 

INSERT INTO "AccountBalances" 
    (DateId, AccountId, AccountCurrAmount) 
    SELECT DateId, AccountId, Sum(AccountCurrAmount) 
    FROM Actual 
GROUP BY DateId, AccountId 
ORDER BY AccountId, DateId; 

CREATE TRIGGER UpdateAccountBalance AFTER UPDATE ON AccountBalances 
BEGIN 
UPDATE AccountBalances 
    SET Balance = 1 + new.Balance 
    WHERE Id = new.Id + 1; 
END; 

PRAGMA recursive_triggers = 'on'; 

UPDATE AccountBalances 
    SET Balance = 1 
WHERE Id = 1 

Answer 1

1. 請檢查SQLITE_MAX_TRIGGER_DEPTH值。它可以設置爲1而不是默認值1000嗎？

2. 請檢查您的SQLite版本。在3.6.18之前，遞歸觸發器不被支持。

請注意，以下爲我工作的100％確定

DROP TABLE 「AccountBalances」

CREATE TEMP TABLE "AccountBalances" (
    "Id" INTEGER PRIMARY KEY, 
    "Balance" REAL); 

INSERT INTO "AccountBalances" values (1,0) 
INSERT INTO "AccountBalances" values (2,0); 
INSERT INTO "AccountBalances" values (3,0); 
INSERT INTO "AccountBalances" values (4,0); 
INSERT INTO "AccountBalances" values (5,0); 
INSERT INTO "AccountBalances" values (6,0); 

CREATE TRIGGER UpdateAccountBalance AFTER UPDATE ON AccountBalances 
BEGIN 
UPDATE AccountBalances 
    SET Balance = 1 + new.Balance 
    WHERE Id = new.Id + 1; 
END; 

PRAGMA recursive_triggers = 'on'; 

UPDATE AccountBalances 
    SET Balance = 1 
WHERE Id = 1 

select * from "AccountBalances"; 

了：

Id Balance 
1 1 
2 2 
3 3 
4 4 
5 5 
6 6