Ive been meaning to ask this one.
I have a table which contains a TEXT datatype. Ive inserted a value in it and try to output and it works. The next thing i did was to insert again with bigger values size. As i tried to output it dont work anymore. I tried to change TEXT to LONGTEXT and tried to output it but no luck. I reinsert the value and it works now in LONGTEXT. My question is
Is there a way that I wouldnt have to reinsert the bigger value size and output it the first time I save it? Thanks
It doesn't seem like that. Had you get any warning during insert in Text column?
When we don't use STRICT_ALL_TABLES strict mode for MySQL, our query execute successfully with warnings only which generally we ignore. So my recommendation is to use STRICT_ALL_TABLES strict mode. Then You'll get exact error while inserting any new row or updating data.
if you are getting any warning. Please check with below query you'll get more insights
show warnings;
Related
My PHP/mySQL backend hosted on an external site has been running fine since 2014. Recently, it started throwing up "field has no default value" errors.
I checked the config and found STRICT_TRANS_TABLES, which gives these errors for fields with no default in some cases.
My question is whether or not it is safe for me to remove this config value. It's mySQL 5.5.5-10.3.12-MariaDB.
Alternatively I could give everything default values, but I don't know which of these solutions is more likely to cause the existing codebase to stop working properly.
I encourage use of strict mode in MySQL because if you disable strict mode, you risk causing some unwanted effects, such as:
If you insert a value to a column where it can't fit, the value is silently truncated. Like inserting a long string into a shorter varchar column, or inserting a big integer into an INT column. This leads you to potentially have bogus values in your database. I prefer these cases to be errors, to prevent such bogus values.
Non-strict mode allows nonsensical dates, like 0000-00-00. There is no such date in the calendar. I'd rather this value not be allowed. If I need to symbolize an absence of a value, I'll use NULL.
Will these cases affect your app? There's no way I or anyone else on Stack Overflow can predict that. You need to test it yourself.
I have been using MySQL to create a database and sometimes warnings come up rather than errors. An example is when I entered a page of full stops as a value. I do not really understand the point of these are why they appear instead of errors. Surely every incorrect value entered into a database should come up with an error, not just some. Please could somebody explain?
If you declared a column to be an integer but are attempting to insert a string, MySQL may perform implicit type conversion and emit an warning. See this question for a detailed example.
If you want to treat all warnings as errors, you should try strict mode.
If I have a table with some varchar columns, whose lengths will obviously be limited, then I would have to show on the front-end whenever insertion of too large values fails. For example, if the limit on the name column is 20, but someone enters a name that is 30 characters long, I should notify them of the error.
This gets to be a lot of work when the application becomes big.
What I would like, to make life a bit easier, and skip taking care of individual limits for every step of the users' journey, is to just carry on with the normal functioning of the application, but show them a warning that their data was not saved in entirety because it was too long. So if MySQL would provide some method that would allow me to ask if all data was saved in its entirety, or some strings were truncated due to their respective varchar fields being shorter (or maybe a property on the MySQLi object that I can check), then my main method for saving data in the database could always check that after any inserts or updates have been executed and just issue a warning on the next page load.
Does MySQL provide such functionality?
Sure you can. MySQL throws a warning, when data is truncated.
You can check is any warning occured by checking ##warning_count
SELECT ##warning_count;
Or
SHOW COUNT(*) WARNINGS;
To check what warning has occured:
SHOW WARNINGS [LIMIT [offset,] row_count]
More info:
http://dev.mysql.com/doc/refman/5.0/en/show-warnings.html
It is very strange what is happening, I have never seen this before and I am pretty familiar with mysql.
When searching a table using the phpMyAdmin table search feature, the result is empty no matter what I put. For example, searching 77 in the ID column returns empty result. However if I run an SQL query also in phpMyAdmin, and then there is the result. For example, select * from table1 where id = ‘77’;
What is even more strange is this only happens on one table, all other tables the search feature is working fine.
I tried repairing the table but empty result still occurs.
I couldn’t find this happening anywhere to any one online…..
Also restarted sql server.
Are you using cPanel - if yes I just described how to fix the problem on cPanel forums:
http://forums.cpanel.net/f5/unable-use-phpmyadmin-search-users-table-313381.html
If your table has a large number of fields an update via the phpMyAdmin interface can exceed the value for the PHP setting 'max_input_vars'. When this happens some of the internal form fields that phpMyAdmin is expecting to receive on the page your update is being posted to are truncated which causes phpMyAdmin to fail, unfortunately silently, and the page redirects with no warnings back to the blank search form. The default for 'max_input_vars' is 1000. I upped mine in my php.ini file to 5000 with no negative side affects and it solved this problem for me.
The setting 'max_input_vars' has a mode of PHP_INI_PERDIR so if you don't have access to your php.ini file then you may be able to set it in an .htaccess file, your httpd.conf file or your .user.ini (since PHP 5.3) file if you have one. I'm not sure exactly what code you would need for an htaccess file but the PHP code to do it is below.
ini_set('max_input_vars', '5000');
Hopefully that should get you started in the right direction.
Very easy. Go to the table and expose max number of rows as much as is showed in the dropdown. Then you are able to search per big pages. It doesnt fetch text through all the table. It plays only with a page of the table.
Let's say that I have a html form (actually I have an editor - TinyMCE) which through PHP inserts a bunch of text into Mysql table.
I want to know the following:
If I have TINYTEXT data type in Mysql column - what happens if the user tries to put more text than 255 bytes into Mysql table??
Does the application save first 255 bytes and "cuts off" the rest? Or does nothing get saved into Mysql table and mysql issues a warning?? Or none of the above?
Actually, what I want and intend to do is the following:
Limit the size of user form input by setting the column data type in Mysql to TEXT data type, which can hold maximum of 64 KB of text. I want to limit the amount of text that gets passed from user to database, so that user can't put too much data to the server at once.
So, basically, I want to know what happens, if the user puts more text through TinyMCE editor than 65535 bytes, assuming TEXT data type in mysql table.
MySQL, by default, truncates the data if it's too long, and sends a warning.
SHOW WARNINGS;
Data truncated for foo ..
Just to be clear: the data will be saved, but you will be missing the part that was too large.
Default mysql configuration truncate the data if the value is greater than the maximum table field definition size, this will produce a non blocking warning.
If you want a blocking error you have to set the sql_mode to STRICT_ALL_TABLES
dev.mysql.com/doc/refman/5.0/en/server-sql-mode.html#sqlmode_strict_all_tables
IMHO the best way is to manage this error via applicatin software.
Hope this helps
If you enter too much data to a TEXT field in MySQL it will insert the row anyway but with that field truncated to the maximum length, and issue a warning.
Even if MySQL did prevent the row from being added it would not be a good way of limiting the length of data that a user can enter. You should check the length of the POSTed string in PHP, and not run the query at all if it is too long - and perhaps tell the user why their data wasn't entered.
As well as this you can prevent the user from entering too many characters at the client side (although you should always do the check server side as well because someone could bypass the client side limit). It appears that there is no built-in way of doing this in TinyMCE, but it is possible by writing a callback: Limit the number of character in tinyMCE