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Informations about the package sql-formatter
A lightweight php class for formatting sql statements.
It can automatically indent and add line breaks in addition to syntax highlighting.
I found myself having to debug auto-generated SQL statements all the time and wanted some way to easily output formatted HTML without having to include a huge library or copy and paste into online formatters.
I was originally planning to extract the formatting code from PhpMyAdmin, but that was 10,000+ lines of code and used global variables.
I saw that other people had the same problem and used Stack Overflow user losif's answer as a starting point. http://stackoverflow.com/a/3924147
The SqlFormatter class has a static method 'format' which takes a SQL string
as input and returns a formatted HTML block inside a pre tag.
If you don't want syntax highlighting and only want the indentations and line breaks, pass in false as the second parameter.
This is useful for outputting to error logs or other non-html formats.
Syntax Highlighting Only
There is a separate method 'highlight' that preserves all original whitespace and just adds syntax highlighting.
This is useful for sql that is already well formatted and just needs to be a little easier to read.
The compress method removes all comments and compresses whitespace.
This is useful for outputting queries that can be copy pasted to the command line easily.
If you want to keep all original whitespace formatting and just remove comments, you can use the removeComments method instead of compress.
Split SQL String into Queries
Another feature, which is unrelated to formatting, is the ability to break up a SQL string into multiple queries.
DROP TABLE IF EXISTS MyTable;
CREATE TABLE MyTable ( id int );
INSERT INTO MyTable (id) VALUES (1),(2),(3),(4);
SELECT * FROM MyTable;
Why Not Regular Expressions?
Why not just use
explode(';', $sql) or a regular expression?
The following example sql and others like it are impossible to split correctly using regular expressions, no matter how complex.
SqlFormatter breaks the string into tokens instead of using regular expressions and will correctly produce:
SELECT ";\"; a;";
SELECT "; abc";
SELECT a,b #comment; FROM test;
Please note, the splitQuery method will still fail in the following cases:
- The DELIMITER command can be used to change the delimiter from the default ';' to something else.
- The CREATE PROCEDURE command has a ';' in the middle of it
- The USE command is not terminated with a ';'