add an escapeSQLString function and fix unescapeSQLString
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Key: CASSANDRA-2492
URL: https://issues.apache.org/jira/browse/CASSANDRA-2492
Project: Cassandra
Issue Type: Bug
Components: Core
Affects Versions: 0.7.4
Reporter: Aaron Morton
Assignee: Aaron Morton
Priority: Trivial
CliUtils.unescapeSqlString repeats the escape character e.g.
{noformat}"my \\t tab" becomes "my \tt"{noformat}
because {{i}} is not bumped when an escape is processed.
Also for Cassandra-2221 I need a function to escape strings back so they will
work if processed by the cli again.
There are a number of non [standard
escapes|http://java.sun.com/docs/books/jls/second_edition/html/lexical.doc.html#101089]
which I assume is a hang over from is original source
https://github.com/apache/cassandra/blob/1aeca2b6257b0ad6680080b1756edf7ee9acf8c8/src/java/org/apache/cassandra/cli/CliUtils.java
Will change to use the
[StringEscapeUtils|http://commons.apache.org/lang/api-2.5/org/apache/commons/lang/StringEscapeUtils.html]
class
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