Hello,
I'm sorry, I really cannot reproduce this issue. I created the table you
suggested:
DROP TABLE IF EXISTS SAMPLE;
CREATE TABLE SAMPLE (USER VARCHAR (20));
INSERT INTO SAMPLE VALUES('');
INSERT INTO SAMPLE VALUES(NULL);
INSERT INTO SAMPLE VALUES('xyz');
I ran these queries (trying to guess what you really meant by "fields", and
table( USER ):
// Query 1
List fields = Arrays.asList(field("user"));
SelectJoinStep<Record> step = create()
.select( fields ).from( table( "sample" ) );
Condition condition = field("user").isNull();
step.where(condition);
System.out.println(step.fetch());
// Query 2
List fields = Arrays.asList(field("user"));
SelectJoinStep<Record> step = create()
.select( fields ).from( table( "sample" ) );
Condition condition = field("user").length().eq(0);
step.where(condition);
System.out.println(step.fetch());
The queries produced the following DEBUG log output:
// Query 1
20:33:22,913 DEBUG [org.jooq.tools.LoggerListener ] -
Executing query : select user from sample where user is null --
SQL rendered with a free trial version of jOOQ 3.5.0
20:33:22,973 DEBUG [org.jooq.tools.StopWatch ] -
Query executed : Total: 122.35ms
20:33:24,838 DEBUG [org.jooq.tools.LoggerListener ] -
Fetched result : +------+
20:33:24,838 DEBUG [org.jooq.tools.LoggerListener ] -
: |user |
20:33:24,838 DEBUG [org.jooq.tools.LoggerListener ] -
: +------+
20:33:24,838 DEBUG [org.jooq.tools.LoggerListener ] -
: |{null}|
20:33:24,838 DEBUG [org.jooq.tools.LoggerListener ] -
: +------+
20:33:24,838 DEBUG [org.jooq.tools.StopWatch ] -
Finishing : Total: 1.986s, +1.864s
// Query 2
20:35:33,447 DEBUG [org.jooq.tools.LoggerListener ] -
Executing query : select user from sample where
char_length(cast(user as varchar)) = cast(? as int) -- SQL rendered with a
free trial version of jOOQ 3.5.0
20:35:33,447 DEBUG [org.jooq.tools.LoggerListener ] -
-> with bind values : select user from sample where
char_length(cast(user as varchar)) = 0 -- SQL rendered with a free trial
version of jOOQ 3.5.0
20:35:33,491 DEBUG [org.jooq.tools.StopWatch ] -
Query executed : Total: 122.772ms
20:35:34,931 DEBUG [org.jooq.tools.LoggerListener ] -
Fetched result : +----+
20:35:34,931 DEBUG [org.jooq.tools.LoggerListener ] -
: |user|
20:35:34,931 DEBUG [org.jooq.tools.LoggerListener ] -
: +----+
20:35:34,931 DEBUG [org.jooq.tools.LoggerListener ] -
: | |
20:35:34,931 DEBUG [org.jooq.tools.LoggerListener ] -
: +----+
20:35:34,931 DEBUG [org.jooq.tools.StopWatch ] -
Finishing : Total: 1.554s, +1.432s
Everything behaves correctly...
Are you sure that...
- You're querying the correct database?
- The database has all data in it and you committed it?
- You didn't confuse some USER and SAMPLE tables in your examples?
- Etc...
Cheers
Lukas
2014-11-05 7:29 GMT+01:00 Abhijit Dhariya <[email protected]>:
> sorry, yes I mean - DSLContext.fetch(<SQL>)
>
> And here is what I'm trying :
>
> final SelectJoinStep<Record> step = dslContext
> .select( (Collection<? extends Field<?>>) (Collection) fields
> ).from( table( USER ) );
>
> Condition condition = field("user").length().eq(0);
>
> step.where(condition)
>
> step.fetch()
>
> In this case this case expecting fetch() to return Records matching for
> empty user.
> which does not seems working for H2 DB.
> However if ran SQL query on H2 console - select * from user where user=''
> return results (or using LENGTH function of H2 to compare empty string).
>
> In addition to empty value check, field.isNull() is also not working.
> And like above - select * from user where user is null --> works fine
> directly on H2 console.
>
> In short trying to find out null and empty user values in DB.
>
> Thanks
>
>
> On Tue, Nov 4, 2014 at 10:14 PM, Lukas Eder <[email protected]> wrote:
>
>> I'm very sorry, I don't fully understand the issue you're experiencing
>> yet.
>>
>> When you write
>>
>> even tried - DSLContext.select("select user from SAMPLE where user is
>>> null") is not working.
>>
>>
>> Did you try your query exactly like this? There is no "select(String)"
>> method on the DSLContext type. Perhaps you meant "DSLContext.fetch()"?
>>
>> In any case, please provide us with all necessary steps to help you. What
>> I'm still missing to understand your issue is:
>>
>> What (exact) jOOQ queries did you write? What did they return? What did
>> you expect them to return?
>>
>> Best,
>> Lukas
>>
>> 2014-11-04 21:07 GMT+01:00 <[email protected]>:
>>
>>> Please find sample H2 DB file attached.
>>> or can use
>>> 1. CREATE TABLE SAMPLE (USER VARCHAR (20))
>>> 2. then insert, '',NULL,'xyz' value.
>>>
>>> both empty and null conditions are not working for me via JOOQ API,
>>> however SQL formed by JOOQ does execute correctly on H2 Console and return
>>> results.
>>> even tried - DSLContext.select("select user from SAMPLE where user is
>>> null") is not working.
>>>
>>> Thanks
>>>
>>> On Tuesday, November 4, 2014 11:14:20 AM UTC-8, Lukas Eder wrote:
>>>>
>>>> Hello,
>>>>
>>>> Both field.length().eq(0) and field.eq("") would be correct
>>>> Can you provide some sample data to reproduce this issue?
>>>>
>>>> Also, in case you're using H2 in Oracle compatibility mode, there's a
>>>> chance that you're using Oracle behaviour, in case of which empty strings
>>>> and NULL would be the same thing. See:
>>>> http://www.h2database.com/javadoc/org/h2/engine/Mode.
>>>> html?highlight=oracle&search=oracle#treatemptystringsasnull
>>>>
>>>> Cheers,
>>>> Lukas
>>>>
>>>> 2014-11-04 19:51 GMT+01:00 <[email protected]>:
>>>>
>>>>> Hi,
>>>>>
>>>>> I have a table in H2 having column of tyI'm pe string with null as
>>>>> well as empty value.
>>>>>
>>>>> So like to know jooq condition to select empty values for a row.
>>>>>
>>>>> jooq --> field.isNull() check allows me to select null value
>>>>>
>>>>> however for empty value tried following, but its not working.
>>>>>
>>>>> field.length.eq(0) or field.eq("")
>>>>>
>>>>> Could you please provide any pointers, whats going wrong here?
>>>>>
>>>>> Thanks
>>>>>
>>>>>
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