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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8790) Improve handling of escape sequence for CQL string literals
Date Thu, 12 Feb 2015 11:43:11 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8790?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14318034#comment-14318034
] 

Sylvain Lebresne commented on CASSANDRA-8790:
---------------------------------------------

I've slightly generalized the description btw as imo it's not really unicode specific, it's
more the fact that people get confused that CQL string literals don't handle escape sequences
(see CASSANDRA-8675) for instance.

> Improve handling of escape sequence for CQL string literals
> -----------------------------------------------------------
>
>                 Key: CASSANDRA-8790
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8790
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Johnny Miller
>            Priority: Minor
>
> Currently to store a string/text value that contains a non-printable unicode character
and than subsequently be able to query it CQLSH I need to store the field as a blob via the
blobAsText and textAsBlob functions. 
> This is not really optimal - it would be better if CQLSH handled this rather than having
to model data around this limitation.
> For example:
> {code:title=Example Code|borderStyle=solid}
> String createTableCql = "CREATE TABLE IF NOT EXISTS test_ks.testunicode (id blob PRIMARY
KEY, inserted_on timestamp, lorem text)";
> session.execute(createTableCql);
> System.out.println("Table created.");		
> 		
> String dimension1 = "state";
> String dimension2 = "card";
> String key = dimension1 + '\u001C' + dimension2;
> Date now = new Date();
> String lorem = "Lorem ipsum dolor sit amet.";
> 		
> String insertcql = "INSERT INTO testunicode (id, inserted_on, lorem) VALUES (textAsBlob(?),
?, ?)";
> PreparedStatement ps = session.prepare(insertcql);
> BoundStatement bs = new BoundStatement(ps);
> bs.bind(key, now, lorem);
> session.execute(bs);
> System.out.println("Row inserted with key "+key);		
> 		
> String selectcql = "SELECT blobAsText(id) AS id, inserted_on, lorem FROM testunicode
WHERE id = textAsBlob(?)";
> PreparedStatement ps2 = session.prepare(selectcql);
> BoundStatement bs2 = new BoundStatement(ps2);
> bs2.bind(key);
> ResultSet results = session.execute(bs2);
> 		
> System.out.println("Got results...");
> 		
> for (Row row : results) {
> 		    System.out.println(String.format("%-30s\t%-20s\t%-20s", row.getString("id"), row.getDate("inserted_on"),
row.getString("lorem")));
> }
> {code}
> And to query via CQLSH:
> {code}
> select * from testunicode where id = 0x73746174651c63617264 ;
>  id                     | inserted_on              | lorem
> ------------------------+--------------------------+-----------------------------
>  0x73746174651c63617264 | 2015-02-11 20:32:20+0000 | Lorem ipsum dolor sit amet.
> {code}



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