CREATE TRIGGER语句用于将触发器添加到数据库模式。触发器是在指定的数据库事件发生时自动执行的数据库操作。 可以指定一个触发器,只要发生特定数据库表的DELETE,INSERT或UPDATE,或者在表的一个或多个指定列上发生UPDATE时触发。 此时SQLite仅支持FOR EACH ROW触发器,而不支持FOR EACH STAT
The SQLiteCREATE TRIGGERcommand is used to create and add triggers to theSQLite database. Triggersare database operations that run automatically when a specified database event occurs. The trigger will be executed when anINSERT,UPDATE, orDELETEoperation is performed on a table. The syntax to cr...
sql-statement ::=CREATE [TEMP | TEMPORARY] TRIGGER trigger-name [ BEFORE | AFTER ]database-event ON [database-name .] table-nametrigger-action 当触发器程序执行中调用了上述前三个之一的形式时,则执行指定的ON CONFLICT进程(ABORT, FAIL或者ROLLBACK) 且终止当前查询,返回一个SQLITE_CONSTRAINT错误并说...
删除行之前的PostgreSQL Create Trigger 假设我们有一个表users,我们希望在删除某一行之前记录一些日志信息。我们可以创建一个BEFORE DELETE触发器来实现这个功能。 示例代码 代码语言:txt 复制 -- 创建日志表 CREATE TABLE user_delete_log ( id SERIAL PRIMARY KEY, user_id INT NOT NULL, deleted_at TIMESTAMP ...
Create TriggerThe Create Trigger Tool allows users to create triggers for a database. The tool generates the SQL create trigger command. The following example is for MS SQL Server: CREATE TRIGGER dbo.test_trigger ON -- table_name -- WITH ENCRYPTION FOR -- DELETE, INSERT, UPDATE -- WITH...
TRIGGER IF NOT EXISTS users_trigger_last_modified AFTER UPDATE ON users FOR EACH ROW WHEN NEW.last_modified < OLD.last_modified BEGIN UPDATE users SET last_modified= (strftime('%s', 'now')) WHERE id=OLD.id; END;"; sql += "PRAGMA user_version = 1;"; let ret = await jeepSqlite.ex...
Describe the problem/error/question I use the Google Drive folder trigger node to watch for any file created in a folder; it works correctly if I upload one file to the watched folder, then if I add another file to that folder when it tr...
TriggerSearch UnregisterActivityLifecycleCallbacks UnregisterForContextMenu UnregisterScreenCaptureCallback Activity.InterfaceConsts Activity.IScreenCaptureCallback ActivityAttribute ActivityGroup ActivityManager ActivityManager.AppTask ActivityManager.MemoryInfo ActivityManager.MemoryInfo.InterfaceConsts ActivityManager.ProcessErr...
Can I trigger timer interval of 24 hours? Can I use a javascript function in C# console application? Can i use TolistAsync() when doing LINQ to object Can lock work between multiple objects of a class ? Can multiple threads safely run the same method simultaneously? can not cast interfac...
SQLite的SQL语法[目录]CREATETRIGGERsql-statement ::=CREatement 触发器 SQL 数据库 原创 yihu0817 2023-07-31 16:47:59 307阅读 hivecreateas select语法 从客户端提交一个 Hive SQL 到 Driver 提交 MapReduce Job,有一个对SQL进行词法分析和语义分析的过程,下面以 select count(*) from tableName 来描述其...