This example creates a database calledMusic. This is the most basic way to create a database using T-SQL. You can also do things like specify where to put the database data files and transaction log files, how much disk space they should use up, how much they're allowed to grow, an...
T-SQL (Transact-SQL) is a set of programming extensions from Sybase and Microsoft that add several features to the Structured Query Language (SQL), including transaction control, exception and error handling, row processing and declared variables. All applications that communicate withSQL Serverdo so...
事务是SQL Server中的基本工作单元,它是用户定义的一个数据库操作序列,这些操作要么做要么全不做,是一个不可分割的工作单位。SQL Server中事务主要可以分为:自动提交事务、隐式事务、显式事务和分布式事务4种类型。 事务的含义# 事务要有非常明确的开始点和结束点,SQL Server中的每一条数据操作语句,例如 SELECT、...
有关设置数据库镜像的本阶段信息,请参阅允许数据库镜像终结点使用证书进行出站连接 (Transact-SQL)。 配置入站连接 本示例显示了下列操作的步骤: 为入站连接配置 Host_A。 为入站连接配置 Host_B。 有关设置数据库镜像的本阶段信息,请参阅允许数据库镜像终结点将证书用于入站连接 (Transact-SQL)。
TCL (Transaction Control Language) DDL (Data Definition Language) DDL statements let you create, alter, and drop objects in your databases. StatementDescriptionExample CREATE Creates new objects: databases, tables, views, indexes, triggers, functions, procedures, etc. CREATE PROCEDURE HumanResources...
SQL 复制 -- On the server instance that hosts the primary replica, -- Backup the transaction log on each primary database: BACKUP LOG MyDb1 TO DISK = N'\\FILESERVER\SQLbackups\MyDb1.bak' WITH NOFORMAT; GO BACKUP LOG MyDb2 TO DISK = N'\\FILESERVER\SQLbackups\MyDb2.bak' WITH NO...
每个事务均以 BEGIN TRANSACTION 语句显式开始,以 COMMIT 或 ROLLBACK 语句显式结束。 隐式事务 在前一个事务完成时新事务隐式启动,但每个事务仍以 COMMIT 或 ROLLBACK 语句显式完成。 批处理级事务 只能应用于多个活动结果集 (MARS),在 MARS 会话中启动的 Transact-SQL 显式或隐式事务变为批处理级事务。 当...
BEGIN TRANSACTION SELECT COUNT(*) FROM HumanResources.Employee WITH (TABLOCK, HOLDLOCK); C. 使用 SQL-92 CROSS JOIN 語法下列範例會傳回兩個數據表 Employee 和Department AdventureWorks2022 資料庫中的交叉乘積。 傳回一份清單,其中包含 BusinessEntityID 資料列與所有 Department 名稱資料列的所有可能組合。SQL...
SQLCopy USEAdventureWorks2022; GO IF EXISTS (SELECTnameFROMsys.objectsWHEREname= N'SaveTranExample')DROPPROCEDURESaveTranExample; GOCREATEPROCEDURESaveTranExample @InputCandidateIDINTAS-- Detect whether the procedure was called-- from an active transaction and save-- that for later use.-- In the ...
SqlConnection myADONETConnection = new SqlConnection(); SqlCommand myADONETCommand = new SqlCommand(); //Connect to the existing connection myADONETConnection = (SqlConnection)(Dts.Connections["Test ADO.NET Connection"].AcquireConnection(Dts.Transaction) as SqlConnection); ...