视图是一种虚拟表 ,本身是不具有数据 的,占用很少的内存空间,它是 SQL 中的一个重要概念.视图建立在已有表的基础上, 视图赖以建立的这些表称为基表.视图的创建和删除只影响视图本身,不影响对应的基表。但是当对视图中的数据进行增加、删除和修改操作时,数据表中的数据会相应地发生变化,反之亦然。视图...
// Sets the value of the element parameter if the value is in the cache.privateboolIfPageCached_ThenSetElement(introwIndex,intcolumnIndex,refstringelement){if(IsRowCachedInPage(0, rowIndex)) { element = cachePages[0].table .Rows[rowIndex % RowsPerPage][columnIndex].ToString();returntrue;...
2. We can use a single SQL query to accomplish what we want. Notice that we treat the inline view exactly the same as we treat a table. Comparing Query 2 and Query 3, we see that the only difference is that we replace the temporary table name in Query 2 with the inline view stat...
dataGridView1.DataSource = JsonResult.Data; 说明你的 DataGridView没有以编程方式绑定数据。这个时候你可以这样添加新行: int index=this.dataGridView1.Rows.Add(); this.dataGridView1.Rows[index].Cells[0].Value = "XXX"; this.dataGridView1.Rows[index].Cells[1].Value = "XXX"; this.dataGridView...
Cannot insert duplicate key row in object 'dbo.blabla..' with unique index 'Idx_blablabl'. The statement has been terminated. at Cannot kill a session that is running a query on a linked server in SQL Server 2008 R2 cannot kill process in SQL Server Activity Monitor Cannot Kill Process st...
以上对象类型可包含table、view、index、procedure、trigger类型,以上对象都可从user_tables、user_views、user_indexes、user_procedures等各个分表中查询,分表中信息更详细一点。 1、sequence序列的使用(自动提供唯一的数值,共享对象) 序列创建模板(将序列值装入内存可以提高效率),序列号会在rollback、系统崩溃、被其他...
// Sets the value of the element parameter if the value is in the cache.privateboolIfPageCached_ThenSetElement(introwIndex,intcolumnIndex,refstringelement){if(IsRowCachedInPage(0, rowIndex)) { element = cachePages[0].table .Rows[rowIndex % RowsPerPage][columnIndex].ToString...
You can turn report execution logging on or off from the Server Properties page in SQL Server Management Studio. The EnableExecutionLogging is an advanced property. By default, log entries are kept 60 days. Entries that exceed this date are removed at 2:00 A.M. every day....
SQL Pane Show 2 more Applies to:SQL Server You can work in the Query and View Designer using the keyboard or the mouse. Refer to the following tables for specific methods. Any Pane ToPressClick Move among the Query and View Designer panesF6, SHIFT+F6Anywhere in the target pane ...
Obtient ou définit l'index de tabulation du contrôle serveur Web. (Hérité de WebControl) TagKey Obtient la valeur HtmlTextWriterTag du contrôle TreeView. TagName Obtient le nom de la balise du contrôle. Cette propriété est principalement utilisée par des développeurs de contrôl...