About SQL Server All the information of the database is stored in its system table . I wonder if you spend too much time checking system forms , Because you're always busy with user forms . however , You may need to do something unusual once in a while , For example, all the triggers in the database . You can check the forms one by one , But if you have 500 If you have a form , It can take a lot of labor .
This makes sysobjects Forms have a place . Although I don't recommend updating this form , But of course you have the right to censor it .
in the majority of cases , The two columns that are most useful to you are sysobjects.name and sysobjects.xtype. The first one is used to list the names of the objects to be investigated , The second one defines the type of the object , It can be one of the following object types ：
C = CHECK constraint
D = Default value or DEFAULT constraint
F = FOREIGN KEY constraint
L = journal
FN = Scalar function
IF = Embedded table functions
P = stored procedure
PK = PRIMARY KEY constraint （ The type is K）
RF = Copy filter stored procedure
S = The system tables
TF = Table function
TR = trigger
U = User table
UQ = UNIQUE constraint （ The type is K）
V = View
X = Extended stored procedure
In the case of a trigger , The other three columns used to identify the trigger type are ：deltrig、instrig and uptrig.
You can use the following command to list all the objects of interest ：
SELECT * FROM sysobjects WHERE xtype = <type of interest>
select * from sys.objects -- Each user-defined schema scope object created in the database corresponds to a row in the table .
select * from sys.sysobjects-- Every object created in the database （ Constraints, for example 、 The default value is 、 journal 、 Rules and stored procedures ） They all correspond to one line .
"sys.objects yes sys.sysobjects Subset "
Determine whether a table already exists in the database , Delete the table if there are any
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[ Table name ]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[ Table name ]
if exists (select * from sysobjects where id = object_id(N' Table name ') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[ Table name ]
if(Exists(Select * From SysObjects Where xtype='U' And Name=' Table name '))
drop table [dbo].[ Table name ]
1、 ask ：object_id(N' Table name ') in N' What does it mean
answer ：N'' representative Unicode type . It can support object names in different languages
2、 ask ：select * from dbo.sysobjects where id = object_id(N'[dbo].[usertab]') and OBJECTPROPERTY(id, N'IsUserTable') = 1
In this sentence object_id(N'[dbo].[usertab]') and OBJECTPROPERTY(id, N'IsUserTable') = 1
What does that mean? ？
answer ：object_id(N'[dbo].[usertab]'): Is to get the system to the table usertab The only distribution ＩＤ
OBJECTPROPERTY(id, N'IsUserTable') = 1
The properties of this object are of table type objectproperty(id,property) Use of functions ,
3、 ask ：USE master SELECT * FROM ...SysObjects ” ...sysobjects ” -- What does the prefix of three periods mean ？
answer ： For database object names Transact-SQL A reference can be a four part name , The format is as follows ：[ server_name.[[database_name].[owner_name]. | database_name.[owner_name]. | owner_name.] ] object_name
Learn more ：
object_id() and objectproperty() It's all system functions ：
object_id(): Returns the object identification number . Parameters ： Object name (nvarchar(128)). return integer
objectproperty(): Returns the property value of an object property . Parameters ： object ID(integer), The name of the zodiac (varchar). return integer
It can be downloaded from MSDN Find information on ：
N: Express UNICODE type , It can support object names in different languages
It can be downloaded from “ Link manager ” I found it there ：
In the connection manager, click “ Programmability ”-》“ function ”-》“ System function ”-》“ Metadata functions ”, You can find object_id and OBJECTPROPERTY
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