I am having issues with combining couple of different things together. I have tried a lot of things suggested on SO but nothing worked, hence posting my question.
So the requirements are
I need to build the dynamic query (to search jsonb column type) in Java
I need to use prepared statements of Java (to avoid sql injection)
I need to replace parameter which is inside single quotes
This query in CLI works perfectly
select * from items where cnt ## '$.**.text like_regex "#finance" flag "i"';
The bit that I want to parameterise is "#finance". So when I build this query
select * from items where cnt ## '$.**.text like_regex ? flag "i"';
When executing I get following error
"The column index is out of range: 1, number of columns: 0."
It's because ? is within single quote so jdbc driver is not able to identify as replaceable parameter perhaps.
The closest question/discussion I could find is in this post: JDBC Prepared statement parameter inside json.
I have tried it however this does not work for me for some reason. They query now I run is
select * from items where cnt ## ?::jsonb
but with this I get following error
org.postgresql.util.PSQLException: ERROR: operator does not exist: jsonb ## jsonb
Hint: No operator matches the given name and argument types. You might need to add explicit type casts.
Position: 106
I have tried various other ways like escaping single quotes etc but nothing really worked. I have very limited knowledge of PostgreSQL, so any help would be appreciated.
Postgres version: 13.1
Java version: 15
select * from items where cnt ## ?::jsonb
The thing on the right of the ## needs to be a jsonpath, not jsonb. So casting it to jsonb is clearly wrong. Try casting it to jsonpath instead.
Related
I have a Lookup that retrieves a few records from a MS SQL table containing schema, table name and a whole where clause. These values are passed to a copy data (within a ForEach) In the copy data i use a Dynamic query statement like:
#concat('select a.*, current_date as crt_tms from ',item().shm_nam,'.',item().tab_nam,
item().where_clause )
This construction works fine without the where_clause or with a where clause with an integer. But it goes wrong with strings like:
'a where a.CODSYSBRN ='XXX' ;'
it's about the quote (')
How can i pass it through?
I know that the where clause as a fixed string in the dynamic query works when i use double quotes (to escape the single quote):
'a where a.CODSYSBRN =''XXX'' ;'
Point is i need the where clause to be completely dynamic because it differ per table
whatever i try i get this kind of error:
Syntax error or access violation;257 sql syntax error: incorrect syntax near "where a"
ps i also tested this, but with the same result:
select a.*, current_date as crt_tms from #{item().shm_nam}.#{item().tab_nam} a #{item().where_clause}
As you have mentioned you are getting whole where clause from the lookup table, the query must have included the column values in where clause for string and integer types separately.
Example lookup table:
In your copy activity, you can use Concat() function as you were already doing it, to combine static values & parameters.
#concat('select * from ',item().schma_name,'.',item().table_name,' ',item().where_clause)
For debugging purposes, I have added the expression in set variable activity, to see the value of the expression.
Iteration1:
Iteration2:
I am trying to make workload test in Jmeter.
This is Postgresql and I would like to combine a random variable with '%'.
Could you help me the way to make sql query?
I have already tried with '?%', but there is an error "The column index is out of range: 1, number of columns: 0.".
The easiest way is switching to Select Statement and amend your query to look like:
SELECT * FROM scloud_usr.tcus_usr_rgn where UID like '${__RandomString(3,ABD,UID)}%'
If you want to continue with the Prepared Select Statement you need to add this % wildcard to the parameter value itself, not in the query, i.e.
More information:
Using “like” wildcard in prepared statement
Performance Testing BLOB from a MySQL Database with JMeter
Prepared statements with % wildcards
I was looking for a way to combine multiple returned rows into a single row on a db2 database (I have an application that can query a database, but will only work if a single row is returned). I found this solution which worked pretty well and was a lot easier than using recursive SQL. However, I ran into a problem when I tried to include a column that was set as TIMESTAMP instead of VARCHAR.
So how can I make this work if a column is a TIMESTAMP type?
Error:
SQL0440N No authorized routine named "XMLTEXT" of type "FUNCTION" having
compatible arguments was found. SQLSTATE=42884
SQL0440N No authorized routine named "XMLTEXT" of type "FUNCTION " having compatible arguments was found.
".
Example:
select xmlserialize(
xmlagg(
xmlconcat(
xmltext(column_name),
xmltext(':'),
xmltext(content),
xmltext(','),
xmltext(DATETIMESTAMP),
xmltext(',')
)
) as varchar(10000)
)
from
yourtable
Instead of the suggested CAST you could wrap the TOCHAR` function around the timestamp value:
select xmlserialize(
xmlagg(
xmlconcat(
xmltext(column_name),
xmltext(':'),
xmltext(content),
xmltext(','),
xmltext(TO_CHAR(DATETIMESTAMP)),
xmltext(',')
)
) as varchar(10000)
)
from
yourtable
If you are on a recent version of DB2 and have LISTAGG available I would recommend to use that function. It is much faster than converting the SQL input to XML types and then converting it back. It requires some CPU cycles due to all the official rules involved.
SELECT peridle, CPU
FROM (SELECT MAX(peridle) FROM try2);
While executing this query in hive I am getting following error
Parse Error: line 1:47 cannot recognize input near 'select' 'MAX' '(' in expression specification
Please suggest a solution how to use aggregate functions in hive subquery
At least two things need to be fixed here:
You are not returning fields named peridle or CPU from the sub-query, yet you are trying to select them.
Hive requires you to alias all sub-queries, even if you don't reference the alias. You can quickly do this by changing the ); at the end to ) x; (or however you want to call it).
I'm using the persistent-postgresql library from Yesod, and I'd like to execute the following raw query:
SELECT * FROM utterance WHERE is_target IS NULL ORDER BY RANDOM() LIMIT 1000
to select 1000 random utterances with a NULL is_target. However, persistent generates the following SQL when I run my code through rawSql:
SELECT * FROM utterance WHERE is_target IS NULL ORDER BY RANDOM() LIMIT 1000"utterance"."id", "utterance"."message", "utterance"."is_target"
This generates an error in postgresql of syntax error at or near ""utterance"" at character 77.
What am I doing wrong?
I fixed this by using the following query instead:
SELECT ?? FROM utterance WHERE is_target IS NULL ORDER BY RANDOM() LIMIT 1000
rawSql doesn't work with column wildcards, because it enforces strong typing on returned data, so it's trying (and failing) to figure out where to put the column names. You need to explicitly list column names OR use some number of "??" placeholders in the statement and bind them at runtime like,
$ (Entity myType utterance, .... ) -> do ....
If you don't want strong typing, you probably also don't want to use Persistent; that's the entire reason it exists.