I'm trying to query the Oracle v$session table using Groovy (imported groovy.sql.SQL) like this:
sql.eachRow("""
Select
'Y' as runInd
from v$session
where upper(module) = ?
having count(*) > 1
""", [programName]) {row -> etc...}
But Groovy keeps telling me: "Groovy:Apparent variable 'session' was found in a static scope but doesn't refer to a local variable, static field or class."
It apparently doesn't like the table called v$session. I've tried many things, I'm not sure why I can't find out how to do this. Any help is appreciated. Thanks!
Tom
Instead of """ which marks it as a multi-line templated groovy string, try ''' which shouldn't try to template things following a $:
sql.eachRow( '''Select
| 'Y' as runInd
| from v$session
| where upper(module) = ?
| having count(*) > 1'''.stripMargin(), [programName]) { row ->
etc...
}
Related
after searching through the whole www I finally ended up here with a question and hopefully more capable responders than I am.
I am trying to implement a full text search on my webpage.
The Sql query works with one WHERE condition but not with several. Unfortunately I have no clue how to solve my problem with the help of EXIST / IN / INNER JOIN or other Operators.
Code which works:
$sql = "SELECT * FROM artikel WHERE author LIKE '$suchtext' LIMIT $offset, $no_of_abs";
Code which doesnt work:
$sql = "SELECT * FROM artikel WHERE (author OR shorty OR vollartikel) LIKE '%$suchtext%' LIMIT $offset, $no_of_abs";
The variable $suchtext is correctly passed and received through jquery $ajax POST and my php script.
Example goal:
author | volltext | shorty
--------+-------------+---------
tulum | tul | asf
rae | zutotu | vizetu
$suchtext is "tu"
Results: 2
Row1 & Row2
I appreciate any answers.
Solution:
$sql = "SELECT * FROM artikel WHERE author LIKE '%$suchtext%' OR shorty LIKE '%$suchtext%' OR vollartikel LIKE '%$suchtext%' LIMIT $offset, $no_of_abs";
LIKE is a binary operator that takes two strings. OR is a boolean operator that operates on boolean values.
You need to explicitly list this out:
(author LIKE ? OR
shorty LIKE ? OR
vollartikel LIKE ?
)
Note that this uses ? as a parameter placeholder. Use parameters when constructing SQL queries in applications.
i just want to know if it is possible to declare variables on the DBeaver´s sql editor and use them on a query
You have to enable variable processing in the "SQL Processing" settings of DBeaver -> Window -> Preferences -> Database -> Editors -> SQL Editor -> SQL Processing. There is a block on Parameters with settings you can change. See the Dynamic Parameter binding section on the wiki.
You should then be able to do:
#set date = '2019-10-09'
SELECT ${date}::DATE, ${date}::TIMESTAMP WITHOUT TIME ZONE
which produces:
| date | timestamp |
|------------|---------------------|
| 2019-10-09 | 2019-10-09 00:00:00 |
Yes you can, using :.
An example:
SELECT * FROM "SYSIBM".SYSDUMMY1
WHERE IBMREQD = :YOUR_VARIABLE
Based on the incredibly helpful post from #nicoschl, here are a couple of minor improvements:
-- using declarations
#set datex_start = cast('2120-01-01' as date) as date_start;
-- datex_start is the var name
-- casting the value in the declaration saves us the work later
-- the var can be given a default fieldname (e.g. "date_start")
-- run as a standalone command since the subsequent SELECT statement doesn't return values when it's all run together
select
${datex_start}
;
This will return a value "2120-01-01" with a fieldname of "date_start".
In the DBeaver SQL editor you can type the following:
-- define variable
#set my_var='hello SQL world'
-- call variable
select :my_var
You can also use ${my_var} to reference the variable; $my_var however did not work for me. I am using DBeaver v. 21.1.
You have to enable at Dbeaver settings:
Top Window > Preferences > and then see print below (updated 2022/08).
I'd like to create a table name in Hive using variable substitution.
E.g.
SET market = "AUS";
create table ${hiveconf:market_cd}_active as ... ;
But it fails. Any idea how it can be achieved?
You should use backtrics (``) for name for that, like:
SET market=AUS;
CREATE TABLE `${hiveconf:market}_active` AS SELECT 1;
DESCRIBE `${hiveconf:market}_active`;
Example run script.sql from beeline:
$ beeline -u jdbc:hive2://localhost:10000/ -n hadoop -f script.sql
Connecting to jdbc:hive2://localhost:10000/
...
0: jdbc:hive2://localhost:10000/> SET market=AUS;
No rows affected (0.057 seconds)
0: jdbc:hive2://localhost:10000/> CREATE TABLE `${hiveconf:market}_active` AS SELECT 1;
...
INFO : Dag name: CREATE TABLE `AUS_active` AS SELECT 1(Stage-1)
...
INFO : OK
No rows affected (12.402 seconds)
0: jdbc:hive2://localhost:10000/> DESCRIBE `${hiveconf:market}_active`;
...
INFO : Executing command(queryId=hive_20190801194250_1a57e6ec-25e7-474d-b31d-24026f171089): DESCRIBE `AUS_active`
...
INFO : OK
+-----------+------------+----------+
| col_name | data_type | comment |
+-----------+------------+----------+
| _c0 | int | |
+-----------+------------+----------+
1 row selected (0.132 seconds)
0: jdbc:hive2://localhost:10000/> Closing: 0: jdbc:hive2://localhost:10000/
Markovitz's criticisms are correct, but do not produce a correct solution. In summary, you can use variable substitution for things like string comparisons, but NOT for things like naming variables and tables. If you know much about language compilers and parsers, you get a sense of why this would be true. You could construct such behavior in a language like Java, but SQL is just too crude.
Running that code produces an error, "cannot recognize input near '$' '{' 'hiveconf' in table name".(I am running Hortonworks, Hive 1.2.1000.2.5.3.0-37).
I spent a couple hours Googling and experimenting with different combinations of punctuation, different tools ranging from command line, Ambari, and DB Visualizer, etc., and I never found any way to construct a table name or a field name with a variable value. I think you're stuck with using variables in places where you need a string literal, like comparisons, but you cannot use them in place of reserved words or existing data structures, if that makes sense. By example:
--works
drop table if exists user_rgksp0.foo;
-- Does NOT work:
set MY_FILE_NAME=user_rgksp0.foo;
--drop table if exists ${hiveconf:MY_FILE_NAME};
-- Works
set REPORT_YEAR=2018;
select count(1) as stationary_event_count, day, zip_code, route_id from aaetl_dms_pub.dms_stationary_events_pub
where part_year = '${hiveconf:REPORT_YEAR}'
-- Does NOT Work:
set MY_VAR_NAME='zip_code'
select count(1) as stationary_event_count, day, '${hiveconf:MY_VAR_NAME}', route_id from aaetl_dms_pub.dms_stationary_events_pub
where part_year = 2018
The qualifies should be removed
You're using the wrong variable name
SET market=AUS; create table ${hiveconf:market}_active as select 1;
The parameterization example in the "SQL Parameters" IPython notebook in the datalab github repo (under datalab/tutorials/BigQuery/) shows how to change the value being tested for in a WHERE clause. Is it possible to use a parameter to change the name of a field being SELECT'd on?
eg:
SELECT COUNT(DISTINCT $a) AS n
FROM [...]
After I received the answer below, here is what I have done (with a dummy table name and field name, obviously):
%%sql --module test01
DEFINE QUERY get_counts
SELECT $a AS a, COUNT(*) AS n
FROM [project_id.dataset_id.table_id]
GROUP BY a
ORDER BY n DESC
table = bq.Table('project_id.dataset_id.table_id')
field = table.schema['field_name']
bq.Query(test01.get_counts,a=field).sql
bq.Query(test01.get_counts,a=field).results()
You can use a field from a Schema object (eg. given a table, get a specific field via table.schema[fieldname]).
Or implement a custom object with a _repr_sql_ method. See: https://github.com/GoogleCloudPlatform/datalab/blob/master/sources/lib/api/gcp/bigquery/_schema.py#L49
I use codeigniter and have an issue about SELECT MAX ... I couldnot find any solution at google search...
it looks like it returns only id :/ it's giving error for other columns of table :/
Appreciate helps, thanks!
Model:
function get_default()
{
$this->db->select_max('id');
$query = $this->db->getwhere('gallery', array('cat' => "1"));
if($query->num_rows() > 0) {
return $query->row_array(); //return the row as an associative array
}
}
Controller:
$default_img = $this->blabla_model->get_default();
$data['default_id'] = $default_img['id']; // it returns this
$data['default_name'] = $default_img['gname']; // it gives error for gname although it is at table
To achieve your goal, your desire SQL can look something like:
SELECT *
FROM gallery
WHERE cat = '1'
ORDER BY id
LIMIT 1
And to utilise CodeIgniter database class:
$this->db->select('*');
$this->db->where('cat', '1');
$this->db->order_by('id', 'DESC');
$this->db->limit(1);
$query = $this->db->get('gallery');
That is correct: select_max returns only the value, and no other column. From the specs:
$this->db->select_max('age');
$query = $this->db->get('members');
// Produces: SELECT MAX(age) as age FROM members
You may want to read the value first, and run another query.
For an id, you can also use $id = $this->db->insert_id();
See also: http://www.hostfree.com/user_guide/database/active_record.html#select
CodeIgniter will select * if nothing else is selected. By setting select_max() you are populating the select property and therefore saying you ONLY want that value.
To solve this, just combine select_max() and select():
$this->db->select('somefield, another_field');
$this->db->select_max('age');
or even:
$this->db->select('sometable.*', FALSE);
$this->db->select_max('age');
Should do the trick.
It should be noted that you may of course also utilize your own "custom" sql statements in CodeIgniter, you're not limited to the active record sql functions you've outlined thus far. Another active record function that CodeIgniter provides is $this->db->query(); Which allows you to submit your own SQL queries (including variables) like so:
function foo_bar()
{
$cat = 1;
$limit = 1;
$sql = "
SELECT *
FROM gallery
WHERE cat = $cat
ORDER BY id
LIMIT $limit
";
$data['query'] = $this->db->query($sql);
return $data['query'];
}
Recently I have been utilizing this quite a bit as I've been doing some queries that are difficult (if not annoying or impossible) to pull off with CI's explicit active record functions.
I realize you may know this already, just thought it would help to include for posterity.
2 helpful links are:
http://codeigniter.com/user_guide/database/results.html
http://codeigniter.com/user_guide/database/examples.html