SQLite CREATE TRIGGER 语句: CREATE TRIGGER database_name.trigger_name BEFORE INSERT ON table_name FOR EACH ROW BEGIN stmt1; stmt2; ... END; 1. 2. 3. 4. 5. 6. 7. SQLite CREATE VIEW 语句: CREATE VIEW database_name.view_name AS SELECT statement...; 1. 2. SQLite CREATE VIRTUAL T...
list 由.separator 字符串分隔的值 tabs 由Tab 分隔的值 tcl TCL 列表元素 .nullvalue STRING 在NULL 值的地方输出 STRING 字符串。 .output FILENAME 发送输出到 FILENAME 文件。 .output stdout 发送输出到屏幕。 .print STRING... 逐字地输出 STRING 字符串。 .prompt MAIN CONTINUE 替换标准提示符。 .quit...
To access or modify specific object keys or array indexes in a JSON structure, you can treat the JSONField as if it were a dictionary/list.Parameters json_dumps –(optional) function for serializing data to JSON strings. If not provided, will use the stdlib json.dumps. json_loads –(...
的方法是不可行的。在sqlite3中,表的结构是固定的,一旦创建表后,不能直接通过list或其他方式动态添加列。 如果需要向表中添加新的列,需要通过以下步骤进行操作: 1. 创建一个新的表,包括原...
• database_list • encoding • foreign_key_list • foreign_keys • freelist_count • fullfsync • ignore_check_constraints • incremental_vacuum • index_info • index_list • integrity_check • journal_mode • journal_size_limit ...
In a nutshell, when some data is deleted from a SQLite database, it is not deleted immediately; instead, it goes to a freelist. There is an exception though: an option called "auto_vacuum", affects whether freelist exists in a database or not. ...
SQLiteDateTypes Connection Scope Sets a comma separated list of database field types that should be interpreted as a datetime fields. Valid values:Any suitable data type list Default value:"DATE,TIME,DATETIME,TIMESTAMP" SQLiteDateValueType
Freelist页的数量保存在数据库头(即文件头)的偏移36处,第一个freelist trunk页的页号则保存在数据库头偏移32处。 B-tree页 B-tree算法提供了key/data在按页分配的存储设备上的保存方法,这些key/data对具有唯一且有序的key(关于b-tree的背景知识请参考Knuth的The Art Of Computer Programming, 第3卷 "Sorting...
5,6] [1, 2, 3, 4, 5, 6] 对于向量而言，经常需要这样的操作，例如向量所有分量同时加、...
SQLiteDatabase3.4. rawQuery() Example3.5. query() Example3.6. Cursor3.7. ListViews, ListActivities and SimpleCursorAdapter4. Tutorial: Using SQLite4.1. Introduction4.2. Create Project4.3. Database and Data Model4.4. User Interface4.5. Running the apps5. ContentProvider and sharing data5.1. Overview...