① %ROWTYPE返回的是一个记录类型,其数据类型和数据库表的数据结构一致。 ② 声明的变量对应于数据库表或视图中列的集合。 ③在%ROWTYPE之前加上数据库表名。 ④ 记录内字段名和数据类型与参照表或视图中的列相同。 具体而言,%ROWTYPE有如下优点: ① 可以不必知道数据库中列的数量和类型。 ② 在运行期间,数...
DbType DeletedRowInaccessibleException DuplicateNameException EnumerableRowCollection EnumerableRowCollection<TRow> EnumerableRowCollectionExtensions EvaluateException FillErrorEventArgs FillErrorEventHandler ForeignKeyConstraint IColumnMapping IColumnMappingCollection
*** (1) WAITING FOR THIS LOCK TO BE GRANTED: RECORD LOCKS space id 61 page no 2017 n bits 72 index PRIMARY of table `nomswc_db`.`activity_team_figure_history` trx id 252274025 lock mode S locks rec but not gap waiting Record lock, heap no 2 PHYSICAL RECORD: n_fields 14; compact...
AI代码解释 protectedoverridevoidOnModelCreating(DbModelBuilder modelBuilder){modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();modelBuilder.Configurations.AddFromAssembly(typeof(MySqlDbContext).Assembly);modelBuilder.Properties().Where(o=>typeof(IRowVersion).IsAssignableFrom(o.DeclaringType)&&o.P...
當設定值而其Type與DataType不相符時發生。 NoNullAllowedException 發生於您嘗試將 null 值插入至AllowDBNull設定為false的資料行時。 範例 下列範例示範如何使用Item[]屬性來取得和設定特定數據行索引的值。 第一個範例會取得用戶按兩下DataGrid控制項中任何資料列中第一個數據行的值。 第二個會設定當做自變數傳遞...
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MappingType MariaDBLinkedService MariaDBSource MariaDBTableDataset MarketoLinkedService MarketoObjectDataset MarketoSource MetadataItem MicrosoftAccessLinkedService MicrosoftAccessSink MicrosoftAccessSource MicrosoftAccessTableDataset MongoDbAtlasCollectionDataset MongoDbAtlasLinkedService MongoDbAtlasSink MongoDbAtlas...
last time it was read. If an update statement is run against the row, the rowversion value is updated. If no update statements are run against the row, the rowversion value is the same as when it was previously read. To return the current rowversion value for a database, use@@DBTS...
You can't customize the numbers and letters in row and column headings. If your goal is to label columns or rows in your worksheet, just click a cell, type the text that you want to use, and then pressTABto move to the next cell. For example, you might label monthly sales numbers ...
If a dbo user, a member of the db_owner role, or the table owner queries a table that has a security policy defined and enabled, the rows are filtered or blocked as defined by the security policy. Attempts to alter the schema of a table bound by a schema bound security policy results...