DateTime field is 'not null' in Table Structure but I want to store data (MVC C# Datetime) 0000-00-00 00:00:00 to MySQL Table without changed table structure.
I Try to do this but its but ERROR!!
Convert.ToDateTime("0000/00/00");
Please HELP , Thanks
The minimum value for .NET DateTime is January 1, 0001; the minimum for MySQL DATETIME is '1000-01-01', but in case of SQL MODE it is possible to insert '0000-00-00' as DATE, see NO_ZERO_DATE in documentation.
If you want to store '0000-00-00' in .NET DateTime structure, then use '0001-01-01', then if it is possible change this value in representation layer.
If you want to store '0000-00-00' in MySQL, then you should check SQL MODE in MySQL server -
SELECT * FROM information_schema.GLOBAL_VARIABLES
WHERE VARIABLE_NAME = 'sql_mode';
From documentation: NO_ZERO_DATE - In strict mode, do not permit '0000-00-00' as a valid date. You can still insert zero dates with the IGNORE option. When not in strict mode, the date is accepted but a warning is generated.
Server SQL Modes
You need to insert those values as string
Like this
Create table tbl(dt datetime);
Insert into tbl values('0000-00-00 00:00:00');
SELECT CAST(dt as char) FROM tbl
Fiddle
If you're asking how to create a C# DateTime object with 0000-00-00 00:00:00 - you can't, it's an invalid date. You could use DateTime.MinValue though. From memory that's 0000-01-01 00:00:00
Why not use NULL? Using magic values instead of NULL is not always a good idea.
Related
I am using C# and MySql. I have a requirement where I need to save DateTime.MaxValue to one of the column.
ADO.NET code gives me below value for DateTime.MaxValue
12/31/9999 11:59:59 PM
When I save this in mysql, I see that the value for that datetime(3) column is saved as:
0000-00-00 00:00:00.000
Sample ADO.NET Code
DateTime time = DateTime.MaxValue;
sqlCommand.Parameters.AddWithValue("Expires", time);
sqlCommand.ExecuteNonQuery();
DataType of the column is datetime(3)
I still cannot figure it out why DateTime.MaxValue is saved as 0000-00-00 00:00:00.000
Any thoughts around this?
A DATETIME column can store values up to '9999-12-31 23:59:59'. DateTime.MaxValue is actually 9999-12-31 23:59:59.9999999. When you try to insert it, the fractional seconds overflow the maximum size of the field.
Normally (in STRICT mode), MySQL Server would issue a datetime field overflow error. But if you're running your server in ANSI mode, the overflow is silently converted to the "invalid" date time value 0000-00-00.
One way to fix this problem is to use STRICT mode in your MySQL Server.
Another way is to specify the column type as DATETIME(6), which allows the fractional seconds to be stored.
A third way is to truncate the fractional seconds from your DateTime objects in C# before inserting them in the database.
Maybe some trigger prevents from saving such a high date to your column?
Have u tried inserting that date from SQL query ?
I did some tests in Oracle DB, and all went smoothly.
It shouldnt be different in mysql ...
I'm learning SQL Server and have an update statement where the current date and time are inserted as follows:
UPDATE data_table
SET Date_Time_Cx = CURRENT_TIMESTAMP
When it is populated in the DB, it appears "Feb 22 2018 5:07PM". How do I get to populate with the format "YYYY-MM-DD hh:mm:ss"? I looked through the SQL Server documents and lots of posts and it seems like it should be populating in the desired way. Where did I go wrong? Thanks!
Then change the type of date_time_cx:
alter table data_table alter column date_time_cx datetime2;
Then it should go into the database using the proper types. You can format the value as you wish afterwards.
I'm not sure what this has to do with C#, but here's a solution for you using base SQL.
SELECT convert(varchar, getdate(), 121)
You can find all kinds of different date and time formats from the link below.
https://anubhavg.wordpress.com/2009/06/11/how-to-format-datetime-date-in-sql-server-2005/
I insert Datetime value into a SQL Server database with the following format: dd-MM-yy HH:mm. If I insert 01-01-18 15:30 into database and execute command
select datetimeColumn from mytable
I get back 2018-01-01 15:30:00.000. But if I retrieve all records of the table which contains the column with datetime type like
meetings = meetings.Where(m => m.meeting_name.ToLower().Contains(searchString.ToLower()));
datetime values become like 01-Jan-18 3:30:00 PM.
How can I keep datetime format the same as the format that I've inserted?
SQL Server stores data as two intergers, the first one reserved for the date and the 2nd one for the time.
meetings = meetings.Where(m => m.meeting_name.ToLower().Contains(searchString.ToLower()));
So by querying you just read date-time as is! All you need to do is to format datetime in your desired string format, for example:
var dateTime = DateTime.Now;
var dateTimeFormmated = dateTime.ToString("yyyy-MM-dd hh:mm:ss.ffff");
// 2018-01-26 05:52:54.3250
SQL Server stores the data as one or more integers, depending on the data type. Numbers are what being stored, not formatted strings. The same applies to other database providers for datetime/timestamp database types.
For instance DATETIME data type. According to SQL Server documentation, the database engine stores a DATETIME value as two integers. The first integer represents the day and the second integer represents the time. The days can range from January 1, 1753, through December 31, 9999, and the times can range from 00:00:00.000 through 23:59:59.997, with the default value being 1900-01-01 00:00:00.000.
The formatted string representation you see in say sql management studio or in any application, is done by the application showing the sql query result for you. This means that the burden of supporting different date/time formats lies with the application doing sql commands.
I have default value getdate() in the blog table in SQL Server database
In fact, I am not even sure if it does store AM or PM in the field
The column date_created is of type datetime and default value is (getdate())
how can I store AM or PM in the field?
The database is not storing AM or PM... it is storing a specific point in time. How you represent that point in time visually (through 24-hour time or 12-hour time) is up to how you do your formatting.
The column date_created is of type datetime
That means it's stored as a binary value that is agnostic about AM/PN and 12/24 hours. All that only happens when you ask for a string representation.
So it could be just the configuration of your App or tools.
Try something like this:
SELECT CONVERT(VARCHAR(20), GETDATE(), 100)
That will yield "Nov 21 2011 1:29PM". See here for more formats.
I have a Db server with DateTime fields in the format of "yyyy-MM-dd mm:hh:ss"
I'm trying to use linq2sql to insert a DateTime member to a DateTime field in one of my tables.
When I do it in SQL I convert the DateTime as following:
"Insert into .... Convert(datetime, getdate(), 120) ..."
But when I try to submit the object from Linq the date time inserts in the wrong format.
Is there a way to define the format that will be inserted to the Db in Linq?
Or is it a DateTime object Issue?
You shouldn't be dealing with a string format when you pass dates and times to the database, any more than you would if you were passing a number. The database should be handling all this for you without any conversions. This is true whether you're using LINQ or within the SQL - almost any time you have to manually do string conversions between types at the database level, you should look for a better solution.
If you read the value back out of the database (as a DateTime again) does it have the right value? If not, in what way is it wrong?