This SQLite tutorial explains how to use Foreign Keys in SQLite with syntax and examples. A foreign key is a way to enforce referential integrity within your SQLite database. A foreign key means that values in one table must also appear in another table.
foreign_keys是SQLite中的一个杂注(pragma),用于控制外键约束的行为。在SQLite中,默认情况下,外键约束是禁用的,即使在创建表时定义了外键关系,也不会强制执行。通过使用foreign_keys杂注,可以启用外键约束并强制执行。 使用foreign_keys杂注可以提供以下优势:
As of version 3.6.19 (2009-10-14), SQLite supports foreign key constraints. But enforcement of foreign key constraints is turned off by default (for backwards compatibility). To enable foreign key constraint enforcement, run PRAGMA foreign_keys=ON or compile with -DSQLITE_DEFAULT_FOREIGN_KEYS=1...
为了解决这个问题，我在SQLiteConnection类的ConnectionString中添加了一个“外键”属性。 外键= ON 外键...
The syntax to drop a foreign key in SQLite is: PRAGMA foreign_keys=off; BEGIN TRANSACTION; ALTER TABLE table1 RENAME TO _table1_old; CREATE TABLE table1 ( column1 datatype [ NULL | NOT NULL ], column2 datatype [ NULL | NOT NULL ], ... ); INSERT INTO table1 SELECT * FROM _ta...
android Sqlite 外键默认是关闭的,需要在SQLiteOpenHelper的子类里面打开,代码如下 @Override public void onOpen(SQLiteDatabase db) { super.onOpen(db); if (!db.isReadOnly()) { // Enable foreign key constraints 开启外键约束 db.execSQL("PRAGMA foreign_keys=ON;"); ...
Can confirm 👍Knex needs to recreate the table to add a foreign keys constraint. 👍 1 Member rijkvanzanten commented Jan 5, 2022 We'll leave #10842 as the primary aggregator for these sqlite issues 👍🏻 rijkvanzanten added Duplicate and removed DB: SQLite Needs More Info labels Ja...
After some some Googling and experimentation, I’ve figured out how to enforce foreign key constraints in SQLite. I got most of the code from Cody Pisto’s sqlite_fk utility. I couldn’t get it to work, but the essential code for the triggers was in its
我已经创建了一个SQL文件,该文件加载到sqlite3中,并为我创建了一堆表。在sql文件中,我尝试使用编译指示执行foreign_keys: PRAGMA foreign_keys = on; -- also 1, true 当我使用-init加载sql文件时,它看起来很好: $ sqlite3 -init sql...
如果如同在 e_sqlite3 中,SQLITE_DEFAULT_FOREIGN_KEYS用來編譯原生程式庫,則不需要啟用外鍵。 C# 複製 public bool? ForeignKeys { get; set; } 屬性值 Nullable<Boolean> 值,指出是否啟用外鍵條件約束。 適用於 產品版本 Microsoft.Data.SQLite 3.0, 3.1, 5.0, 6.0, 7.0, 8.0, 9.0 ...