Read And Write A Constraint Or Default Value
Nov 20, 2007
Okay, maybe I'm getting ahead of myself.
Using SQL Server Express, VWD and .net 2.0 I've figured out how to drop a Table Column Constraint or Default Value/Binding and then Create it again using a stored procedure. What I can't figure out is how to retrieve that column's constraint value and write it to, say a label, in an aspx page, simply for reference. Is it possible? In this case the Data Type of the column is money.
I'm using it to perform a calculation to a column with a value that the user inserts into another column. (Column1(user input) minus Column2(with Default Value) = Column3(Difference). I just want to read Column2's Default Value for reference so I know whether to change it or not.
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Jan 12, 2012
i attached adventure works in sql server 2008 and it showing as read only ,make it read write or remove read only tag from database.
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Mar 24, 2015
How to identify whether the files are in read write or read only?
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Aug 26, 2015
I'm trying to do Sharepoint DR with Log Shipping and every thing configured except one thing which is switch the WSS_Content (Standby /Read-Only) DB to be ready and Write.Â
I tried from
GUI or ALTER DATABASEÂ [WSS_Content]Â SET
READ_WRITEÂ WITHÂ NO_WAIT
but I received the below error:Â
Database WSS_Content is in Warm StandbyÂ
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Jan 18, 2008
I have two database files, one .mdf and one .ndf. The creator of these files has marked them readonly. I want to "attach" these files to a new database, but cannot do so because they are read-only. I get this message:
Server: Msg 3415, Level 16, State 2, Line 1
Database 'TestSprintLD2' is read-only or has read-only files and must be made writable before it can be upgraded.
What command(s) are needed to make these files read_write?
thanks
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Aug 15, 2014
Can a user of db owner role of a database change the databse option to read only and read-write?If not what permission I need to grant to the user?
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Oct 25, 2007
Hi all,
Any advice much appreciated.
I have a table that defines the metadata of some values that will be stored in some generic table somewhere. Here's the table definition:
CREATE TABLE [dbo].[AttributeType]
(
[AttributeTypeID] [int] NOT NULL
, [AttributeTypeName] [nvarchar] (40) NOT NULL
, [AttributeDataType] [nvarchar] (40) NOT NULL CONSTRAINT CK_AttributeDataType_Values CHECK ([AttributeDataType] IN ('NVARCHAR','INT','DECIMAL','DATETIME'))
, [AttributeLength] tinyint NULL
, [AttributePrecision]tinyint NULL
, [AttributeScale] tinyint NULL
, CONSTRAINT CK_AttributeScale_Values CHECK (AttributeScale <= AttributePrecision)
) ON [PRIMARY]
What I want to do is write a constraint (or 4 constraints) that says:
If AttributeDataType = 'nvarchar', AttributeLength cannot be NULL, AttributePrecision must be NULL, AttributeScale must be NULL
If AttributeDataType = 'int', AttributeLength must be NULL, AttributePrecision must be NULL, AttributeScale must be NULL
If AttributeDataType = 'datetime', AttributeLength must be NULL, AttributePrecision must be NULL, AttributeScale must be NULL
If AttributeDataType = 'decimal', AttributeLength must be NULL, AttributePrecision cannot be NULL, AttributeScale cannot be NULL
Is that even possible? I've tried and failed (admittedly not for too long) to fathom a way of doing it.
-Jamie
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Oct 12, 2014
how to i write a trigger to enforce this constraint..A rental can be made only if the customer is registered with the company and the car is not currently rented out. If not, the rental will not be successful.
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Apr 4, 2004
Pls help guys
I need to know whether its possible to read or write in to XML documents from SQLServer directly using stored procedures.
I basically need to created a number of XML documents on a nightly basis.,..........also i need to read a no of XML docs to SQLServer...
Is it wise to use stored procedures for this?
Or are there performance issues.........and do u suggest doing in in .NET
Your comments are appreciated..
Regards
Benny
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Apr 15, 2008
I have a query that runs for 10 sec on one database( A) and 5 min on another database(B) even though two database have identical scheam, tables, index and statistics..
I ran a profiler and got the below information
CPU READ Write
Database A: 92051 711956 8774
Database B: 91812 7621589 315822
A query runs on database has a significant larger read and write.. I don;t understand why this is happening? even though these two database have the same structure?? it has the same execution plan as well..
How can i solve this issue?
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Aug 8, 2006
Hi,I see the following in Books Online: CONSTRAINT--Is an optional keywordindicating the beginning of a PRIMARY KEY, NOT NULL, UNIQUE, FOREIGNKEY, or CHECK constraint definition...But I have a table column defined as follows:[MONTH] [decimal] (2, 0) NOT NULL CONSTRAINT[DF__TBLNAME__MONTH__216361A7] DEFAULT (0)My question: Is "DEFAULT" a constraint, or is it called something else?Thanks,Eric
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Oct 17, 2001
Hi, we're trying to read from a table and write back to the same table and are having a lot of trouble with blocking. What could we do to prevent our application from hanging due to blocking of this type?
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May 31, 2004
Hi ..
I want to Write in files or read from files
for example i have My_File.txt . i need a syntax and i want to call this syntax in my Store procedure and this syntax write forexample " Hello Word " in My_File.txt .
and i want another syntax that read from My_File.txt forexample "Word" from My_File.txt . what are those syntaxes do that ??
thanks
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Apr 21, 2006
Hello,
We currently run sql 2005 server and also sql express in our dev environments. We use sql express as an offline store (smart client). We have a similar/exact schema on the sql 2005 server and also the express.
We use the auto attach feature to connect to the express version of the database. Both the developer machines and the one that is running the sql 2005 server have exactly the same hardware configuration. The only difference may be that the server box is not running the VS.Net environment. The disk space etc is pretty much the same. Actually we run another database server(DB2) on the 2005 server machine.
We have observed that sql express is much slower and queries execute much slower aswell. For example, this may not be a totally scientific way of checking but a long running query on the server took only 2 minutes while on express it took longer than 9 minutes. The schema and data etc are the same.
Is there something we need to look into as far as read write speed/performance goes ?
TIA,
Avinash
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Aug 3, 2007
Hi,
I am using a Script Component and I have a Read/Write Variable varStatusCase (as assigned in the Custom Properties of my Script Component). I used this inside my script to get a specific value. However, when I ran it I get this error:
The collection of variables locked for read and write access is not available outside of PostExecute.
How do I repair this?
Thanks,
cherriesh
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Jul 26, 2004
Hi,
I need list out the defaulat and constraint value in SQL2K. Where I get those values.
Thanks,
Ravi
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Jan 2, 2007
A few weeks ago a client asked me to add a column to a table so Icreated this script:ALTER TABLE dbo.tblIndividual ADD fldRenewalStatus BIT NOT NULLCONSTRAINT fldRenewalStatus_Default DEFAULT 0Now they want to change it from a BIT to an INT, to store an enum.Fair enough. However, no matter how much I wrangle with a script, Ican't find a reliable way to alter the column. I've mixed and matchedthe following and nothing seems to work:EXEC sp_unbindefault 'tblIndividual.fldRenewalStatus'DROP DEFAULT DF_tblIndividual_fldRenewalStatusALTER TABLE tblIndividualDROP CONSTRAINT fldRenewalStatus_DefaultALTER TABLE tblIndividualDROP COLUMN fldRenewalStatusGOALTER TABLE tblIndividualADD fldRenewalStatus int NOT NULLCONSTRAINT fldRenewalStatus_Default DEFAULT 0Thoughts?ThanksEdward
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Apr 16, 2008
Hello,
I have a table set up called tbl_DailySummary_new. In that table I have a column called €˜RevType€™ char(2) NOT NULL Default €˜00€™. I'm trying to populate this table from another table called tbl_DailySummary. The RevType column in tbl_DailySummary allows null values (and has them). When I attempt to insert all records from tbl_dailysummary into tbl_DailySummary_new, I get the following error message:
Msg 515, Level 16, State 2, Line 1
Cannot insert the value NULL into column 'RevType', table 'TxnRptg.dbo.tbl_DailySummary_new'; column does not allow nulls. INSERT fails.
The statement has been terminated.
Why dosen€™t the default constraint on the RevType column in the new table pick this up?
Thank you for your help!
cdun2
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May 20, 2008
Hi ,
I want to define default constraint for a column to force it to UPPER.
USE [GLP]
GO
ALTER TABLE [dbo].[col1] ADD CONSTRAINT [DF_col1_TypeCode] DEFAULT (N'UPPER(col1)') FOR [col1]. Its defined..
But when I tried ti insert into records..It not convertedto uppecase at all...Isn't it possible this way ?
Thanks,
-V
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Apr 28, 2008
Troops,
I'm a software developer trying to hack my way thru a SQL script to increase the size of a column. The column has a constraint on it that won't allow the alter unless its dropped.
Alter command:
ALTER TABLE dbo.QueueBack ALTER Column QBQueue varchar(4) NOT NULL
Message response:
Msg 5074, Level 16, State 1, Line 10
The object 'DF__QueueBack__QBQue__76818E95' is dependent on column 'QBQueue'.
Msg 4922, Level 16, State 9, Line 10
ALTER TABLE ALTER COLUMN QBQueue failed because one or more objects access this column.
So, my script drops the default constraint, alters the column size and then adds the constraint back. The problem is that the constraint does NOT appear to be the same as it was prior. I can run the Alter command on the column and it will allow me to change the size of the column... where it prohibited me from doing such before. How do I restore the default constraint so it is exactly the way it was before I dropped it?
Thx,
Stretch
---------------------------------
Script for drop, alter, add... modified slightly for simplicity...
declare @Error int
BEGIN TRAN
SELECT @Error = 0
DECLARE @defname VARCHAR(100), @cmd VARCHAR(1000)
-- this is retrieved at run time from the sysconstraints table; hard-coded here...
set @defname = 'DF__QueueBack__QBCategory'
IF @defname <> ''
BEGIN
SET @cmd = 'ALTER TABLE dbo.QueueBack DROP CONSTRAINT '+ @defname
EXEC(@cmd)
if @@ERROR = -1
BEGIN
SET @Error = -1
END
END
if @Error = 0
BEGIN
-- modify the column
ALTER TABLE dbo.QueueBack ALTER Column QBCategory varchar(7) NOT NULL
if @@ERROR = -1
BEGIN
SET @Error = -1
END
END
if @Error = 0
BEGIN
-- Add the default constraint back
SET @cmd = 'ALTER TABLE dbo.QueueBack ADD CONSTRAINT '+ @defname + ' DEFAULT ('''') FOR QBCategory'
EXEC(@cmd)
if @@ERROR = -1
BEGIN
SET @Error = -1
END
END
if @Error = 0
BEGIN
-- Commit if no error...
COMMIT TRAN
END
ELSE
BEGIN
-- Rollback if error...
ROLLBACK TRAN
END
GO
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May 28, 2008
Hi,
I was reading that many of these high traffic websites actually have 2 databases, 1 database is used ONLY for reads, while the other is for writes.
How does one go about creating such a setup? How does the database where writes are allowed replicated the data to the read only database server?
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Jul 23, 2005
Hi,I would like to use database locking mechanism to control access to anexternal resource (like file system).What I need is1. an exclusive (write) lock conflicting with any access to theresource (both for read and write)2. non-exlusive (read) lock conflicting with writes onlyHow this could be done?I'd appreciate any reply.Vadim
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Jan 29, 2008
Dear All,
I am looking for a sample code to do read/write operation on SQLCE 3.0 using VC++. For SQLCE 2.0 I have used ATL Consumer template and works well.
Thanks in Advance.
Param
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Aug 2, 2007
Hello Guys,
in SSIS I want to get a set of data and do some modifications on it before I insert it into the destinatipn. So far so good. Some of the modifications will include comparisions between two columns and if certain field is NULL then I want to get the value from the other one I was comparing to. When using conditional splits, I only get the rows to be redirected so that I can do whatever next. However, I want like use the variables as a storage so that I can put the value of one of the two columns in this variable which will be actually loaded into the destination finally. Any help?
Thanks
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Jun 25, 2007
I need to create a flat file as word document, may i know how to write text from stored procedure if a file is already exist then the text will append, how to do it ?
Thank you.
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Feb 6, 2008
I use excel as an interface to write query to retrieve data from a database in network drive. My problem is everyone can open and edit my query. Of course, the univeral database access user name and password will ask but everyone know this.
How can I put password to prevent any query modification?
Thanks
Daniel
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Jul 14, 2007
Is there a way to get the last read/write time of a table?
I want to have a few tables, but only allow them to exist if they have been used in the last 30 days. I want to set up a "purge" job to clear out any tables that have not been used in 30 days.
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Dec 7, 2001
I can't seem to get the syntax correct for ALTERing an existing column with a default constraint. I've been to Help and BOL. There are examples that show how to use the ALTER command to add a column with a default constraint but not how to do it on an existing column.
Any help would be appreciated.
Sidney Ives
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Oct 26, 2005
Hi guys,
I have this problem. I want to add a new primary key to a table but i want the name of the contstraint to be generated by the system. I have this TSQL code.
ALTER TABLE TableTest
ADD CONSTRAINT PRIMARY KEY (C1)
Reading the BOL, it says that if you don't supply a name for the constraint it generates one. But I get this error "Incorrect syntax near the keyword 'PRIMARY'".
If I add a name to the constraint, it works fine.
I'm using SQL Server 2000
Thanks
Darkneon
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Aug 23, 2006
I have two fields CourseID and Erpid in table.
CourseID has identity property with integer datatype.
I need to add a default value for Erpid column which will show a value like 'A' + CourseID column. Erpid is Varchar column.
How can I use Convert function in default constraint?
Thanks!
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Jun 12, 2007
I have a default constratint on DateColumn getdate()-1
I have used enterprise manager to update it to yesterday's date everyday.
I would like to have a SQL which can check for the date in the system
or even a trigger which checks when the date changes the constraint is updated itself. If this is not possible I would like to have a stored procedure which I will schedule to run as a job everyday once.
So if today 6/12/2006, the default value in the Datecolumn should be
6/11/2006.
This gives me a error, i tried but could not fix the bug.
Alter Table TABLE_NAME
Alter Constraint DF_DATECOLUMN
Default getdate()-1
Ashley Rhodes
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Mar 28, 2004
Hi All,
I need some help from you experts.
I need to develop something that reads from xml files and writes in to sqlserver, also it should read from SQLServer and writes to xml.
I should be able to give this as a job to exectue daily ,etc.
Can we do this using stored procedures in SQLServer.
Pls paste some sample code, if any or direct me to any url with better info.
Thanks in advance
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Apr 10, 2008
Hello,
Any help here much appreciated.
I am using sql server 2000 to perform address cleansing. there is a point in my scripting when a table i pass values to becomes read/write.
i suspect this is when i run a cursor through the table.
Is anyone able to confirm for me whether running a cursor changes a table's properties?
Many thanks.
Tim
Ps as the table seems to be read/write it is harder to tell if NULLs are in the table and this is messing with joins I have further down the track.
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