I was trying to add a primary key to existing table but could not. "alter table custsales add constraint pk_custsales primary key (id,type)" Is this supported? Is there a different syntax to do this? Using ALTER TABLE to add a constraint or a new column marked as PRIMARY KEY is not...
[Table("user")]publicclassUser{// PrimaryKey is typically numeric[PrimaryKey, AutoIncrement, Column("_id")]publicintId {get;set; } [MaxLength(250), Unique]publicstringUsername {get;set; } ... } 定義C# 類別之後,請呼叫SQLiteConnection類別上的CreateTable泛型方法,以在資料庫中產生資料表。 將...
*/createtableifnotexists"User"("Id"integernotnullprimarykey autoincrement,--用户id"Guid"textNOTNULL
SQLite has limitedALTER TABLEsupport that you can use to add a column to the end of a table or to change the name of a table. If you want to make more complex changes in the structure of a table, you will have to recreate the table. You can save existing data to a temporary table...
{// Create the tables if they don't existdb.CreateTable<Subject>(); } [...] } When I launch this I get the following error after db.CreateTable(); is executed: Cannot add a PRIMARY KEY column. What is going wrong here? I really would appreciate your help. ...
query.exec("CREATE TABLE IF NOT EXISTS alarms (" "id INTEGER PRIMARY KEY AUTOINCREMENT," "alarm_message TEXT NOT NULL," "alarm_time TEXT NOT NULL," // 报警时间,存储为TEXT,格式为yyyy-MM-dd_hh:mm:ss "created_at TEXT NOT NULL" // 记录时间,存储为TEXT,格式为yyyy-MM-dd_hh:mm:ss ...
Add an ID (int) as the primary key 3. Create another table (Frames) 4. Add an ID (int) as the primary key 5. Add another column to be used as the foreign key of type int `CREATE TABLE Frames ( ID INTEGER PRIMARY KEY AUTOINCREMENT , Designation TEXT(100), Description TEXT(250),...
[PrimaryKey, AutoIncrement] publicint_id {get;set; } public string bla {get;set; } public string ble {get;set; } public MyModel() { } } Then: conn.CreateTable<MyModel>(CreateFlags.FullTextSearch4); var item=newMyModel();
Table Name 表格名，输入具体名称。最上方框中的那个按钮，是增列字段的按钮，点击按钮弹出中间的字段...
您省略了ID和INTEGER类型之间的空格，因此列名变为IDINTEGER，这反过来又会导致不创建表，因为AUTOINCREMENT必须用于具有INTEGER PRIMARY KEY的列。更正该错误后，对于全新安装，ReadEventsPerMonth方法可以正常工作。因此，问题，因为你没有看到错误：-