I have a column of the image datatype that a piece of software uses to store text for some reason.
I'm trying to pull the data out and convert it to varchar using many examples I've found here.
Currently I have
SELECT CONVERT(VARCHAR(MAX), CONVERT(VARBINARY(MAX), BITS,2)) FROM V_SO_MTL_BINARY
The problem is that only converts the first character from the string for some reason. How do I convert from Image to Varchar and not only get the first character.
You might just need NVARCHAR(MAX) instead of VARCHAR(MAX) depending on how the data is originally inserted.
If it is in fact nvarchar then typical ASCII text will have lots of 00 bytes. e.g. N'Some String' is stored as 0x53006F006D006500200053007400720069006E006700
These will be treated as string terminating null characters when casting back to varchar hence only seeing the first character.
SELECT CAST(0x53006F006D006500200053007400720069006E006700 AS VARCHAR(30))
Returns S
Related
The text data I have for a column in database in an enterprise application (uses hibernate) is huge and after increasing varchar size to a specific number, I don't have any other choice but to change the datatype to text. Can anyone help me understand how it may affect my application. Do I need to take care of anything else or just changing the datatype works ?
You should use TEXT. Although, that's the same thing as VARCHAR:
If the declared type of the column contains any of the strings "CHAR",
"CLOB", or "TEXT" then that column has TEXT affinity. Notice that the
type VARCHAR contains the string "CHAR" and is thus assigned TEXT
affinity
Also note
Note that numeric arguments in parentheses that following the type
name (ex: "VARCHAR(255)") are ignored by SQLite - SQLite does not
impose any length restrictions (other than the large global
SQLITE_MAX_LENGTH limit) on the length of strings, BLOBs or numeric
values.
Your application work fine with datatype text.You don't need to take care of any thing
if you want to be sure, create backup database first just in case,
or at least backup/duplicate table you were going to make changes
for me I also prefer varchar than text
because varchar used to be using smaller memory than text
ex : address (100) , records only using 80 character, will be saved as 80 character in varchar
while in text , will be saved as 100 character
I need to find part of string which is stored in a varbinary field on SQL Server 2008. The data that is stored in the field is in HEX Binary.
For example the field has 0xA0000000001A000000000000000000000000000000000000000000000000000000850000002416002F002A002000480065006C006C006F0020002A002F0007
I can ignore the first 37 characters. When I look at this in a SQL application it reads as follows after the first 37 characters
/..H.e.l.l.o../
I know that the hex binary is stored in Unicode format.
My question is how can i search for the word 'Hello' using a SQL Statement.
I tried the following below but i do not get any results
SELECT CONVERT(varchar(max),fieldname) from tablename where fieldname like '%Hello%;
I would really appreciate any help that I can get
Thanks
If the binary value is in a Unicode encoding, you will need to cast it to NVARCHAR, and also use a Unicode string literal for the search value:
SELECT CONVERT(nvarchar(max),fieldname) from tablename where fieldname like N'%Hello%';
I have a MySQL column "phone" , and when data comes from my php form, if there's a zero at the beginning, it will disappear in the table, for example :
"06719823" becomes "6719823"
I first though it was a problem from php, cause I'm using mysql_real_escape_string(), but then I tried to modify the SQL field directly on phpmyadmin, and I can't add a first 0, it always delete it.
Colonne Type Interclassement Attributs Null Défaut Extra
phone int(10) Oui NULL
What's wrong ? Should I assign an "interclassement" utf8_general_ci ?
Change your column type to char(10) for 10 digit phone numbers.
If the column type is int (integer), the number will be internally represented as an integer, meaning "first 0s" won't be stored, as they hold no meaning for integers.
Since what you are actually trying to store has meaning as a sequence of characters, and not as a quantity, it would make more sense to store it as a char(n), for n-digit sequences, or as a varchar for sequences whose size varies a lot.
Make your phone attribute as Varchar or Text to avoid this.
Phone numbers can at time also contain brackets and hyphens plus you can avoid your problem as well.
Change your data type. Int Data type will not store the starting 0's.
You can try as suggested above char or varchar
Integers : 06719823 = 6719823 = 0006719823
Save the phone as varchar if you would like to retain zeros in the begining
I've got a column called description of type NVARCHAR(MAX) - biggest you can have. I need to return this field with quotes around it, so I'm trying to
SELECT QUOTENAME(description, '"')
This doesn't work - I get a "string or binary data would be truncated error."
My googling tells me that this problem can be solved by using SET ANSI_WARNINGS OFF, but if I do that, I still get the same error anyway.
Normally I would just pull the values into a temp table and use a field that is two characters bigger than the field I'm pulling in, thus ensuring that the QUOTENAME function won't cause any problems. How do I make a column two characters bigger than MAX, though?
QUOTENAME is a function intended for working with strings containing SQL Server identifier names and thus only works for strings less than or equal to the length of sysname (128 characters).
Why doesn't SELECT '"' + description +'"' work for you?
I have imported a csv file containing spatial area information in varchar, then converted varchar(max) values to varbinary(max) by adding '0x' to varchar(max) values prior to conversion. By then, apart from the '0x' in the beginning, the data in varbinary(max) column looks exactly the same as the varchar(max) one in converted to text.
Now I run the following script:
select geometry::STGeomCollFromWKB(wkb, 4326) from dbo.MyTable
where WKB is the varbinary(max) column.
Running the above script throws this error: 'The well-known binary (WKB) input is not valid'
The source of data is from Open Street Map so no doubt they are correct area data. So I assume there must be something wrong in what I am doing or I am missing some point to convert WKB to geometry data type.
Could anyone help please?
I assume the problem is when converting the varchar data to varbinary you are converting the actual character representation of the binary data, rather than just changing the type to binary.
Eg, if you have the data 0xDEADBEEF in your varchar column, then doing
convert(varbinary(max), 'DEADBEEF') will convert the ascii character representations into binary.
What you want to do instead is convert the hex string into binary, which is possible using the style parameter of convert.
SELECT convert(varbinary(max), 'DEADBEEF', 2)
should do what you want to convert your varchar wkb data into real binary.