BEGIN TRANSACTION;

BEGIN;
    CREATE TABLE "Logs"."Events"
    (
        EventId BIGSERIAL NOT NULL PRIMARY KEY,PrimaryKeyId bigint NOT NULL,EventDateTime date NOT NULL DEFAULT(now()),Action varchar(12) NOT NULL,UserId integer NOT NULL REFERENCES "Office"."Users"(UserId),PrincipalUserId varchar(50) NOT NULL DEFAULT(user)
    );

    CREATE TABLE "Logs"."EventDetails"
    (
        EventDetailId BIGSERIAL NOT NULL PRIMARY KEY,EventId bigint NOT NULL REFERENCES "Logs"."Events"(EventId),Resource varchar(64) NOT NULL,OldVal varchar(4000) NOT NULL,NewVal varchar(4000) NOT NULL
    );


    COMMIT TRANSACTION;
    RAISE NOTICE 'Task completed sucessfully.'
EXCEPTION;
    ROLLBACK TRANSACTION;
    RAISE ERROR @ErrorMessage,@LineNumber,@ErrorState --how to catch errors and display them????
END;

问题：

>如何在T-sql中打印“PRINT”等消息？
>如何提出异常信息的错误？