得到SQLServer当前运行的语句
SP_WHO2是一个比较流行的SQL查看运行状态的函数，但是它有比较多的限制，比如我们只能看到命令类型，而不能查看具体内容，本文介绍的方法可以破除这种限制。
运行的效果如下：
原理分析
我们可以从sys.dm_exec_requests视图中读取正在运行的请求，以及这个请求的句柄(sql_handle),通过句柄，可以从sys.dm_exec_sql_text得到请求的具体内容。同时，通过(SPID)联接sys.processes这个表，可以得到运行语句的用户、数据库、及应用程序名，所有的字段都在下表中列了出来：
|
Column name |
Data type |
Description |
|
spid |
smallint |
SQL Server process ID. |
|
ecid |
smallint |
Execution context ID used to uniquely identify the subthreads operating on behalf of a single process. |
|
dbid |
smallint |
ID of the database currently being used by the process. |
|
nt_username |
nchar(128) |
Windows user name for the process, if using Windows Authentication, or a trusted connection. |
|
status |
nchar(30) |
Process ID status. For example, running and sleeping. |
|
wait_type |
bigint |
Current wait time in milliseconds. |
|
Individual Query |
varchar |
SQL Statement currently running. |
|
Parent Query |
varchar |
Routine that contains the Individual Query. |
|
program_name |
nchar(128) |
Name of the application program. |
|
Hostname |
nchar(128) |
Name of the workstation. |
|
nt_domain |
nchar(128) |
Microsoft Windows domain for the client, if using Windows Authentication, or a trusted connection. |
|
Start_time |
datetime |
Time when the request is scheduled to run. |
最后的SQL语句如下：
|
SELECT [Spid] = session_Id , ecid , [Database] = DB_NAME(sp.dbid) , [User] = nt_username , [Status] = er.status , [Wait] = wait_type , [Individual Query] = SUBSTRING (qt.text, er.statement_start_offset/2, (CASE WHEN er.statement_end_offset = -1 THEN LEN(CONVERT(NVARCHAR(MAX), qt.text)) * 2 ELSE er.statement_end_offset END - er.statement_start_offset)/2) ,[Parent Query] = qt.text , Program = program_name , Hostname , nt_domain , start_time FROM sys.dm_exec_requests er INNER JOIN sys.sysprocesses sp ON er.session_id = sp.spid CROSS APPLY sys.dm_exec_sql_text(er.sql_handle)as qt WHERE session_Id > 50 -- Ignore system spids. AND session_Id NOT IN (@@SPID) -- Ignore this current statement. ORDER BY 1, 2 |
