Im trying to make a query that help me get a user by its username. What i want to do is to check if the given username is unique. so what i thought about is to uppercase the username when i do my select request and compare it with an uppercase of the given username. This is what i tried:
SQL("select * from utilisateur where upper(pseudo) = {pseudo}").on(
'pseudo -> pseudo.toUpperCase
).as(Utilisateur.utilisateur.singleOpt)
but it get this error:
[RuntimeException: SqlMappingError(too many rows when expecting a single one)]
I tried this too:
SQL("select * from utilisateur where ucase(pseudo) = {pseudo}").on(
'pseudo -> pseudo.toUpperCase
).as(Utilisateur.utilisateur.singleOpt)
and i got this error:
[PSQLException: ERROR: function ucase(character varying) does not exist Indice : No function matches the given name and argument types. You might need to add explicit type casts. Position : 33]
What should i do ?
PS:Im using PostgreSQL 9.1
First, in Play!, only use singleOpt if you're expecting exactly one row back. Otherwise, it will throw an exception. Since you do want just one row, add a LIMIT 1 to the end of your query.
The PostgreSQL function you want is upper(). Here's an example:
SQL("select * from utilisateur where upper(pseudo) = {pseudo} limit 1").on(
'pseudo -> pseudo.toUpperCase
).as(Utilisateur.utilisateur.singleOpt)
(You can play with it here: http://sqlfiddle.com/#!1/6226c/5)
Related
I have a table that one of the columns is in type TEXT and holds a json object inside.
I what to reach a key inside that json and ask about it's value.
The column name is json_representation and the json looks like that:
{
"additionalInfo": {
"dbSources": [{
"user": "Mike"
}]
}
}
I want to get the value of the "user" and ask if it is equal to "Mike".
I tried the following:
select
json_representation->'additionalInfo'->'dbSources'->>'user' as singleUser
from users
where singleUser = 'Mike';
I keep getting an error:
Query execution failed
Reason:
SQL Error [42883]: ERROR: operator does not exist: text -> unknown
Hint: No operator matches the given name and argument type(s). You might need to add explicit type casts.
Position: 31
please advice
Thanks
The error message tells you what to do: you might need to add an explicit type cast:
And as you can not reference a column alias in the WHERE clause, you need to wrap it into a derived table:
select *
from (
select json_representation::json ->'additionalInfo'->'dbSources' -> 0 ->>'user' as single_user
from users
) as t
where t.single_user = 'Mike';
:: is Postgres' cast operator
But the better solution would be to change the column's data type to json permanently. And once you upgrade to a supported version of Postgres, you should use jsonb.
When using primitive types such as Integer, I can without any problems do a query like this:
with connection.cursor() as cursor:
cursor.execute(sql='''SELECT count(*) FROM account
WHERE %(pk)s ISNULL OR id %(pk)s''', params={'pk': 1})
Which would either return row with id = 1 or it would return all rows if pk parameter was equal to None.
However, when trying to use similar approach to pass a list/tuple of IDs, I always produce a SQL syntax error when passing empty/None tuple, e.g. trying:
with connection.cursor() as cursor:
cursor.execute(sql='''SELECT count(*) FROM account
WHERE %(ids)s ISNULL OR id IN %(ids)s''', params={'ids': (1,2,3)})
works, but passing () produces SQL syntax error:
psycopg2.ProgrammingError: syntax error at or near ")"
LINE 1: SELECT count(*) FROM account WHERE () ISNULL OR id IN ()
Or if I pass None I get:
django.db.utils.ProgrammingError: syntax error at or near "NULL"
LINE 1: ...LECT count(*) FROM account WHERE NULL ISNULL OR id IN NULL
I tried putting the argument in SQL in () - (%(ids)s) - but that always breaks one or the other condition. I also tried playing around with pg_typeof or casting the argument, but with no results.
Notes:
the actual SQL is much more complex, this one here is a simplification for illustrative purposes
as a last resort - I could alter the SQL in Python based on the argument, but I really wanted to avoid that.)
At first I had an idea of using just 1 argument, but replacing it with a dummy value [-1] and then using it like
cursor.execute(sql='''SELECT ... WHERE -1 = any(%(ids)s) OR id = ANY(%(ids)s)''', params={'ids': ids if ids else [-1]})
but this did a Full table scan for non empty lists, which was unfortunate, so a no go.
Then I thought I could do a little preprocessing in python and send 2 arguments instead of just the single list- the actual list and an empty list boolean indicator. That is
cursor.execute(sql='''SELECT ... WHERE %(empty_ids)s = TRUE OR id = ANY(%(ids)s)''', params={'empty_ids': not ids, 'ids': ids})
Not the most elegant solution, but it performs quite well (Index scan for non empty list, Full table scan for empty list - but that returns the whole table anyway, so it's ok)
And finally I came up with the simplest solution and quite elegant:
cursor.execute(sql='''SELECT ... WHERE '{}' = %(ids)s OR id = ANY(%(ids)s)''', params={'ids': ids})
This one also performs Index scan for non empty lists, so it's quite fast.
From the psycopg2 docs:
Note You can use a Python list as the argument of the IN operator using the PostgreSQL ANY operator.
ids = [10, 20, 30]
cur.execute("SELECT * FROM data WHERE id = ANY(%s);", (ids,))
Furthermore ANY can also work with empty lists, whereas IN () is a SQL syntax error.
I'm trying to retrieve some data from a postgresql database using psycogp2, and either exclude a variable number of rows or exclude none.
The code I have so far is:
def db_query(variables):
cursor.execute('SELECT * '
'FROM database.table '
'WHERE id NOT IN (%s)', (variables,))
This does partially work. E.g. If I call:
db_query('593')
It works. The same for any other single value. However, I cannot seem to get it to work when I enter more than one variable, eg:
db_query('593, 595')
I get the error:
psycopg2.DataError: invalid input syntax for integer: "593, 595"
I'm not sure how to enter the query correctly or amend the SQL query. Any help appreciated.
Thanks
Pass a tuple as it is adapted to a record:
query = """
select *
from database.table
where id not in %s
"""
var1 = 593
argument = (var1,)
print(cursor.mogrify(query, (argument,)).decode('utf8'))
#cursor.execute(query, (argument,))
Output:
select *
from database.table
where id not in (593)
I have a SQL query entered into a constant. One of the fields that I need to put in my where clause is USER which is a key word. To run the query I put the keyword into double quotes.
I have tried all of the suggestions from here yet none seem to be working.
Here is what I have for my constant:
SELECT_USER_SECURITY = "SELECT * FROM USER_SECURITY_TRANSLATED WHERE \"USER\" = '{user}' and COMPANY = " \
"'company_number' and TYPE NOT IN (1, 4)"
I am not sure how to get this query to work from my constant.
I also tried wrapping the whole query in """. I am getting a key error on the USER.
SELECT_USER_SECURITY = """SELECT * FROM USER_SECURITY_TRANSLATED WHERE "USER" = '{user}' and
COMPANY = 'company_number' and TYPE NOT IN (1, 4)"""
Below is the error I am getting:
nose.proxy.KeyError: 'user'
So the triple quoted solution was the best one. The problem I was running into was I had not included the "user" key in my dictionary of params which formatted the query.
I have a problem with BIRT when I try to pass multiple values from report parameter.
I'm using BIRT 2.6.2 and eclipse.
I'm trying to put multiple values from cascading parameter group last parameter "JDSuser". The parameter is allowed to have multiple values and I'm using list box.
In order to be able to do that I'm writing my sql query with where-in statement where I replace text with javascript. Otherwise BIRT sql can't get multiple values from report parameter.
My sql query is
select jamacomment.createdDate, jamacomment.scopeId,
jamacomment.commentText, jamacomment.documentId,
jamacomment.highlightQuote, jamacomment.organizationId,
jamacomment.userId,
organization.id, organization.name,
userbase.id, userbase.firstName, userbase.lastName,
userbase.organization, userbase.userName,
document.id, document.name, document.description,
user_role.userId, user_role.roleId,
role.id, role.name
from jamacomment jamacomment left join
userbase on userbase.id=jamacomment.userId
left join organization on
organization.id=jamacomment.organizationId
left join document on
document.id=jamacomment.documentId
left join user_role on
user_role.userId=userbase.id
right join role on
role.id=user_role.roleId
where jamacomment.scopeId=11
and role.name in ( 'sample grupa' )
and userbase.userName in ( 'sample' )
and my javascript code for that dataset on beforeOpen state is:
if( params["JDSuser"].value[0] != "(All Users)" ){
this.queryText=this.queryText.replaceAll('sample grupa', params["JDSgroup"]);
var users = params["JDSuser"];
//var userquery = "'";
var userquery = userquery + users.join("', '");
//userquery = userquery + "'";
this.queryText=this.queryText.replaceAll('sample', userquery);
}
I tryed many different quote variations, with this one I get no error messages, but if I choose 1 value, I get no data from database, but if I choose at least 2 values, I get the last chosen value data.
If I uncomment one of those additional quote script lines, then I get syntax error like this:
The following items have errors:
Table (id = 597):
+ An exception occurred during processing. Please see the following message for details: Failed to prepare the query execution for the
data set: Organization Cannot get the result set metadata.
org.eclipse.birt.report.data.oda.jdbc.JDBCException: SQL statement does not return a ResultSet object. SQL error #1:You have an error in
your SQL syntax; check the manual that corresponds to your MySQL
server version for the right syntax to use near 'rudolfs.sviklis',
'sample' )' at line 25 ;
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to
your MySQL server version for the right syntax to use near
'rudolfs.sviklis', 'sample' )' at line 25
Also, I should tell you that i'm doing this by looking from working example. Everything is the same, the previous code resulted to the same syntax error, I changed it to this script which does the same.
The example is available here:
http://developer.actuate.com/community/forum/index.php?/files/file/593-default-value-all-with-multi-select-parsmeter/
If someone could give me at least a clue to what I should do that would be great.
You should always use the value property of a parameter, i.e.:
var users = params["JDSuser"].value;
It is not necessary to surround "userquery" with quotes because these quotes are already put in the SQL query arround 'sample'. Furthermore there is a mistake because userquery is not yet defined at line:
var userquery = userquery + users.join("', '");
This might introduce a string such "null" in your query. Therefore remove all references to userquery variable, just use this expression at the end:
this.queryText=this.queryText.replaceAll('sample', users.join("','"));
Notice i removed the blank space in the join expression. Finally once it works finely, you probably need to make your report input more robust by testing if the value is null:
if( params["JDSuser"].value!=null && params["JDSuser"].value[0] != "(All Users)" ){
//Do stuff...
}