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https://issues.apache.org/jira/browse/DERBY-2019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12493990
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John H. Embretsen commented on DERBY-2019:
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Thank you very much for the patch and documentation work, Bryan! I tried the
patch, and it resolves all the odd cases reported in this Jira issue. I have
not run any other tests with the patch, but I noticed that a number of both
positive and negative test statements for the describe command were added to
the tools/ij7.sql test script. Nicely done!
Also, now that the documentation will be improved, I can certainly accept the
potentially slightly confusing error messages for
- describe without a valid argument, e.g.
ij> describe *;
ERROR 42X01: Syntax error: Encountered "describe" at line 1, column 1.
- using the wildcard '*' in a schema with no tables/views
ij> describe '*';
IJ ERROR: No table exists with the name null
I'd say go ahead and commit these changes, unless there are further comments.
> IJ's describe command does not handle quotes very well
> ------------------------------------------------------
>
> Key: DERBY-2019
> URL: https://issues.apache.org/jira/browse/DERBY-2019
> Project: Derby
> Issue Type: Bug
> Components: Tools
> Affects Versions: 10.2.1.6, 10.3.0.0
> Reporter: John H. Embretsen
> Assigned To: Bryan Pendleton
> Priority: Minor
> Attachments: describe_enhancement.diff, docs.diff,
> rtoolsijcomrefdescribe.html
>
>
> In IJ, the describe <table | view> command does not handle quotes very well.
> Current behavior is:
> a) Double quotes:
> IJ does not recognize describe command when encountering double quotes.
> ij> create table "CamelCaseTable" (col1_in_cct int);
> 0 rows inserted/updated/deleted
> ij> describe "CamelCaseTable";
> ERROR 42X01: Syntax error: Encountered "describe" at line 1, column 1.
> I'm assuming that it should be possible to execute the describe command on
> case-sensitive table names.
> b) Single quotes:
> IJ describes all tables in current schema when encountering two single quotes
> after the describe command.
> ij> create table table1 (col1_table1 int);
> 0 rows inserted/updated/deleted
> ij> create table table2 (col1_table2 int);
> 0 rows inserted/updated/deleted
> ij> describe '';
> COLUMN_NAME
> |TYPE_NAME|DEC&|NUM&|COLUM&|COLUMN_DEF|CHAR_OCTE&|IS_NULL&
>
> ------------------------------------------------------------------------------
> COL1_TABLE1 |INTEGER |0 |10 |10 |NULL |NULL |YES
> COL1_TABLE2 |INTEGER |0 |10 |10 |NULL |NULL |YES
>
> 2 rows selected
> In case b), it does not make a difference whether the single quotes actually
> surround a valid table name, some garbage, or nothing at all.
> I must admit that b) seems like a useful feature, listing all columns in all
> tables in a schema, but it's usage is not very intuitive, nor is it
> documented, so this may be a bug.
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