For example: CREATE TABLE departments ( department_id INTEGER PRIMARY KEY AUTOINCREMENT, department_name VARCHAR ); CREATE TABLE employees ( employee_id INTEGER PRIMARY KEY AUTOINCREMENT, last_name VARCHAR NOT NULL, first_name VARCHAR, department_id INTEGER, CONSTRAINT fk_departments FOREIGN KEY (dep...
import sqlite3 conn = sqlite3.connect('example.db', foreign_keys=True) 3、检查外键约束是否已启用 要检查当前连接是否启用了外键约束,可以查询sqlite_master表,以下是一个示例: SELECT name, sql FROM sqlite_master WHERE type='table' AND sql LIKE '%FOREIGN KEY%'; 这将返回所有包含外键约束的表的名...
CustomerID INTEGER PRIMARY KEY, CustomerName TEXT ); ''')# 创建 Orders 表cursor.execute(''' CREATE TABLE IF NOT EXISTS Orders ( OrderID INTEGER PRIMARY KEY, CustomerID INTEGER, OrderDate TEXT, FOREIGN KEY(CustomerID) REFERENCES Customers(CustomerID) ); ''')# 插入 Customers 表的示例数据cus...
self.model.setRelation(1, QSqlRelation("customers", "customer_id", "first_name"))表示第2列是foreign key, 使用customers 表,显示字段由 customer_id更换为 first_name 接下来,如果需要编辑外键字段,希望双击单元格后,外键字段变成下拉列表,从外键表中选择已存在的值,如何实现呢? 在该单元格使用QSqlRelatio...
-f,--foreign-keys: enable foreign-key constraint pragma. -u,--url-prefix: URL prefix for application, e.g. "/sqlite-web". -c,--certand-k,--key- specify SSL cert and private key. -a,--ad-hoc- run using an ad-hoc SSL context. ...
Each database connection can always turn enforcement of foreign key constraints on and off and run-time using the foreign_keys pragma.Enforcement of foreign key constraints is normally off by default, but if this compile-time parameter is set to 1, enforcement of foreign key constraints will be...
The SQLITE_CONSTRAINT_FOREIGNKEY error code is anextended error codeforSQLITE_CONSTRAINTindicating that aforeign key constraintfailed. (1032) SQLITE_READONLY_DBMOVED The SQLITE_READONLY_DBMOVED error code is anextended error codeforSQLITE_READONLY. The SQLITE_READONLY_DBMOVED error code indicates tha...
(sql)except Error as e:print(e)def create_orders_table(conn):try:cursor = conn.cursor()sql = '''CREATE TABLE IF NOT EXISTS orders (id INTEGER PRIMARY KEY AUTOINCREMENT,user_id INTEGER,product_name TEXT,price REAL,FOREIGN KEY (user_id) REFERENCES users (id));'''cursor.execute(sql)...
SQLITE_ENABLE_UPDATE_DELETE_LIMIT SQLITE_OMIT_ALTERTABLE SQLITE_OMIT_ANALYZE SQLITE_OMIT_ATTACH SQLITE_OMIT_AUTOINCREMENT SQLITE_OMIT_CAST SQLITE_OMIT_COMPOUND_SELECT SQLITE_OMIT_EXPLAIN SQLITE_OMIT_FOREIGN_KEY SQLITE_OMIT_PRAGMA SQLITE_OMIT_REINDEX SQLITE_OMIT_SUBQUERY SQLITE_OMIT_TEMPDB SQLITE_OMIT_...
"FOREIGN KEY(manager_id) REFERENCES users(id)" + ")" ) let stmt = db.prepare("INSERT INTO users (email) VALUES (?)") for email in ["alice@example.com", "betsy@example.com"] { stmt.run(email) } db.totalChanges // 2 db.lastChanges // {Some 1} db.lastID // {Some 2} for...