Escaping New Line Character Within SQL Query

How do I remove a line break (\n) in SQL?

As backslash ('\') is an escape character, you should double it :

Select * from address_table;
UPDATE address_table SET address = replace (address, '\\n', ' ');

Escape line breaks in MySQL output

SELECT REPLACE(
REPLACE(yourcolumn, '\r', '\\r'),
'\n',
'\\n'
) FROM yourtable;

How to insert a new line (\n) character in SQLite?

In SQL, there is no mechanism to escape newline characters; you have to insert them literally:

INSERT INTO MyTable VALUES('Hello
world');

Alternatively, construct the string dynamically:

INSERT INTO MyTable VALUES('Hello' || char(10) || 'world');

(The type of newline (13 or 10 or 13+10) is OS dependent.)

When you embed the SQL statements in C++ strings, you have to escape the newline in the first case:

q1 = "INSERT INTO MyTable VALUES('Hello\nworld');";
q2 = "INSERT INTO MyTable VALUES('Hello' || char(10) || 'world');";

Are newline escapes accepted in mysql query?

The newlines in your above example will have no effect on the query or result set for that matter.

It really has nothing to do with MySQL actually, but rather with PHP. When you quote a string in double quotes and use \n or \r escape chars, PHP simply interprets them into special characters, namely a newline or carriage return. php.net/manual/en/language.types.string.php Therefore the above query is basically a query over 3 lines which MySQL accepts perfectly as something like:

SELECT account.id, client.client_id
FROM account, client
WHERE account.id = 19

Think of a script file where the query is over several lines of the file. Similar thing

I don't want psycopg2 to escape new line character (\n) in query result

The point is that values were edited with pgadmin3 (incorrectly, the correct way is shift+enter to add a new line). I asked the user to use phppgadmin (easier for him, multiline fields are edited with textarea control) and now everything is working properly.

So pyscopg2 WORKS fine, I'm sorry to thought it was the culprit.

He was putting literals \n in order to put new lines.

PostgreSQL newline character

The backslash has no special meaning in SQL, so '\n' is a backslash followed by the character n

To use "escape sequences" in a string literal you need to use an "extended" constant:

select 'test line 1'||E'\n'||'test line 2';

Another option is to use the chr() function:

select 'test line 1'||chr(10)||'test line 2';

Or simply put the newline in the string constant:

select 'test line 1
test line 2';

Whether or not this is actually displayed as two lines in your SQL client, depends on your SQL client.


UPDATE: a good answer from @thedayturns, where you can have a simpler query:

select E'test line 1\ntest line 2';

C# Obeying the NewLine Character in a String Pulled from SQL server

I am assuming you have stored a literal backslash then the character "n" in the string in the database, and not a newline character. Thus you have to do the String.Replace which you are doing.

You are so close, but you need to escape your backslash:

strResult = strResult.Replace("\\n", Environment.NewLine);

Without escaping the backslash, the compiler is interpreting the \n to be a special escape sequence for a newline, so your line becomes the equivalent of "replace NewLine with NewLine" (which you have figured out does nothing).

Alternatively, you can prefix the string constant with an @ symbol, meaning to treat it as a literal:

strResult = strResult.Replace(@"\n", Environment.NewLine);


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