使用触发器计算SQLite表中的运行总数

Question

如何创建SQLite触发器来计算“实际”表上的运行总数？以下SQL代码应更新AccountBalances表，以便余额列从1,2,3，... rowcount开始计数。但是，即使启用了recursive_triggers，触发器也只会更新第二行。以下结果是第1行= 1，第2行= 2，之后的行为空。

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. 请检查SQLITE_MAX_TRIGGER_DEPTH值。它可以设置为1而不是默认值1000吗？

2. 请检查您的SQLite版本。在3.6.18之前，递归触发器不被支持。

请注意，以下为我工作的100％确定

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