用于报告当前正在运行的请求的用户事务状态的标量函数。 XACT_STATE 指示请求是否有活动的用户事务，以及是否能够提交该事务。

Transact-SQL 语法约定

XACT_STATE()  
若要查看 SQL Server 2014 (12.x) 及更早版本的 Transact-SQL 语法，请参阅早期版本文档。
Azure Synapse Analytics 中的无服务器 SQL 池不支持此语法。
smallint
XACT_STATE 返回下列值。
XACT_STATE 和 @@TRANCOUNT 函数都可用于检测当前请求是否具有活动的用户事务。 @@TRANCOUNT 不能用于确定事务是否已分类为不可提交的事务。 XACT_STATE 不能用于确定是否有嵌套事务。
下面的示例使用XACT_STATE 构造的 CATCH 块中的 TRY...CATCH 来确定是提交事务还是回滚事务。 由于 SET XACT_ABORT 设置为 ON，因此违反约束的错误将导致事务进入无法提交的状态。
USE AdventureWorks2022;  
-- SET XACT_ABORT ON will render the transaction uncommittable  
-- when the constraint violation occurs.  
SET XACT_ABORT ON;  
BEGIN TRY  
    BEGIN TRANSACTION;  
        -- A FOREIGN KEY constraint exists on this table. This   
        -- statement will generate a constraint violation error.  
        DELETE FROM Production.Product  
            WHERE ProductID = 980;  
    -- If the delete operation succeeds, commit the transaction. The CATCH  
    -- block will not execute.  
    COMMIT TRANSACTION;  
END TRY  
BEGIN CATCH  
    -- Test XACT_STATE for 0, 1, or -1.  
    -- If 1, the transaction is committable.  
    -- If -1, the transaction is uncommittable and should   
    --     be rolled back.  
    -- XACT_STATE = 0 means there is no transaction and  
    --     a commit or rollback operation would generate an error.  
    -- Test whether the transaction is uncommittable.  
    IF (XACT_STATE()) = -1  
    BEGIN  
        PRINT 'The transaction is in an uncommittable state.' +  
              ' Rolling back transaction.'  
        ROLLBACK TRANSACTION;  
    -- Test whether the transaction is active and valid.  
    IF (XACT_STATE()) = 1  
    BEGIN  
        PRINT 'The transaction is committable.' +   
              ' Committing transaction.'  
        COMMIT TRANSACTION;     
END CATCH;  
@@TRANCOUNT (Transact-SQL)

BEGIN TRANSACTION (Transact-SQL)

COMMIT TRANSACTION (Transact-SQL)

ROLLBACK TRANSACTION (Transact-SQL)

SAVE TRANSACTION (Transact-SQL)

TRY...CATCH (Transact-SQL)