AddColumn✔ AddForeignKey✔(重新构建) AddPrimaryKey✔(重新构建) AddUniqueConstraint✔(重新构建) AlterColumn✔(重新构建) CreateIndex✔ CreateTable✔ DropCheckConstraint✔(重新构建) DropColumn✔(重新构建) DropForeignKey✔(重新构建) ...
AddColumn ✔ AddForeignKey ✔ (重建) AddPrimaryKey ✔ (重建) AddUniqueConstraint ✔ (重建) AlterColumn ✔ (重建) CreateIndex ✔ CreateTable ✔ DropCheckConstraint ✔ (重建) DropColumn ✔ (重建) DropForeignKey ✔ (重建) DropIndex ✔ DropPrimaryKey ✔ (重建) DropTable ✔...
1. 新建表时添加外键 [CONSTRAINT] [外键约束名称] FOREIGN KEY(外键字段名) REFERENCES 主表名(主键字 段名) 2. 已有表添加外键 ALTER TABLE 从表 ADD [CONSTRAINT] [外键约束名称] FOREIGN KEY (外键字段名) REFERENCES 主表(主键字段名); */ -- 创建主表 create table department( id INT PRIMARY KEY...
删除表:drop table customer; ALTER TABLE kehu RENAME customer; -- 修改表名 ALTER TABLE customer ADD age INT(20); -- 增加表字段 ALTER TABLE customer DROP sex; -- 删除表字段 ALTER TABLE customer CHANGE 字段名 xinming VARCHAR(50); -- 修改表字段 插入数据(录入数据): INSERT INTO customer(id,...
User defined functions supportsqlite_orm library allows to create easy data model mappings to your database schema. It is built to manage (CRUD) objects with a primary key and without it. It also allows you to specify table names and column names explicitly no matter how your classes actually...
由于失败，似乎没有，而且可能是对数据库名称和表名之间的区别的误解。
如果您有需要保留的数据，那么最简单的方法可能是使用onupgrade方法，使用altertablesql（如果需要的话）来...
cursor.execute("ALTER TABLE users ADD COLUMN email TEXT") # 提交并关闭连接 conn.commit() conn.close() 14. 备份与恢复 定期备份数据库是保障数据安全的重要措施之一。备份可以通过数据库管理工具或编程方式来实现,具体方法取决于数据库类型和需求。
addPrimaryKey() Builds a SQL statement for adding a primary key constraint to an existing table. yii\db\sqlite\QueryBuilder addUnique() Creates a SQL command for adding an unique constraint to an existing table. yii\db\sqlite\QueryBuilder alterColumn() Builds a SQL statement for changing the...
SQLITE_CANTOPEN_NOTEMPDIR (270) SQLITE_CONSTRAINT_CHECK (275) SQLITE_CONSTRAINT_COMMITHOOK (531) SQLITE_CONSTRAINT_FOREIGNKEY (787) SQLITE_CONSTRAINT_FUNCTION (1043) SQLITE_CONSTRAINT_NOTNULL (1299) SQLITE_CONSTRAINT_PRIMARYKEY (1555) SQLITE_CONSTRAINT_ROWID (2579) ...