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I'm trying to run a PL/SQL procedure that takes array values as input. Since I have to call this procedure many times for my data, I tried to use the However, I get an error message from oracledb as soon as I try to use more than one dataset in the bind arguments. It doesn't make a difference if I use positional or named binds, and using SQL code: begin
CM_DATA.ADD_ITEM(
p_public_id => :public_id,
p_type_id => :type_id,
p_field_names => :field_names,
p_field_values => :field_values
);
end;The Bind parameters (example with only 2 datasets): [
{
'public_id': <oracledb.Var of type DB_TYPE_NUMBER with value None>,
'type_id': 24,
'field_names': ['SERVER_ID', 'DOOCS_LOCATION', 'DOOCS_PROPERTY'],
'field_values': ['195181', 'AMC1', 'ACTIVATE']
}, {
'public_id': <oracledb.Var of type DB_TYPE_NUMBER with value None>,
'type_id': 24,
'field_names': ['SERVER_ID', 'DOOCS_LOCATION', 'DOOCS_PROPERTY'],
'field_values': ['195181', 'AMC1', 'ALIAS']
}
]The Relevant code: # These are the input values to my Python function (add_bulk_items)
type_id = 24
public_ids = [None, None]
bulk_data = [{'SERVER_ID': 195181, 'DOOCS_LOCATION': 'AMC1', 'DOOCS_PROPERTY': 'ACTIVATE'},
{'SERVER_ID': 195181, 'DOOCS_LOCATION': 'AMC1', 'DOOCS_PROPERTY': 'ALIAS'}]
with connection.cursor() as cursor:
bind_args, return_vars = [], []
for data, public_id in zip(bulk_data, public_ids):
# convert input dict to separate name/value lists
field_names, field_values = [], []
for k, v in data.items():
field_names.append(k.upper())
if v is None:
field_values.append(None)
else:
field_values.append(str(v))
public_id_var = cursor.var(int) # needed for IN/OUT parameter
public_id_var.setvalue(0, public_id)
bind_args.append(dict(public_id=public_id_var, type_id=type_id, field_names=field_names, field_values=field_values))
cursor.setinputsizes(public_id=None, type_id=None, field_names=100, field_values=100)
cursor.executemany(sql, bind_args, batcherrors=False)The error I'm getting: The exception is raised here: https://github.com/oracle/python-oracledb/blob/v2.5.0/src/oracledb/impl/thin/messages.pyx#L1142 Again, running this with only 1 item in the bind list works fine, and so does calling Versions used:
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Replies: 3 comments 6 replies
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Before you get too deep into this, review the caveat in the Batch Execution of PL/SQL doc:
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@anthony-tuininga pointed out that the doc note about PL/SQL and OUT binds with executemany() applies to Thick mode, whereas in Thin mode there is a definite advantage to using executemany() in this scenario. |
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This may have some useful clues: with oracledb.connect(user=un, password=pw, dsn=cs) as connection:
with connection.cursor() as cursor:
stmts = [
"""create or replace type my_varchar_list as varray(100) of varchar2(100)""",
"""create or replace procedure myproc(p in number, names in my_varchar_list, count out number) as
begin
count := p + names.count;
end;""",
]
for s in stmts:
cursor.execute(s)
if cursor.warning and cursor.warning.full_code == "DPY-7000":
print(cursor.warning)
print(s)
type_obj = connection.gettype("MY_VARCHAR_LIST")
# Single execute()
with connection.cursor() as cursor:
n = 100
obj = type_obj.newobject()
obj.extend(['Alex', 'Bobbie', 'Charlie'])
with connection.cursor() as cursor:
count = cursor.var(oracledb.DB_TYPE_NUMBER)
cursor.callproc("myproc", [n, obj, count])
# prints "OUT bind value is 103"
print(f"OUT bind value is {count.getvalue()}")
# Using executemany()
with connection.cursor() as cursor:
obj1 = type_obj.newobject()
obj1.extend(['Alex', 'Bobbie'])
obj2 = type_obj.newobject()
obj2.extend(['Charlie', 'Dave', 'Eric'])
obj3 = type_obj.newobject()
obj3.extend(['Fred', 'Georgia', 'Helen', 'Ian'])
data = [
{"p": 100, "names": obj1},
{"p": 200, "names": obj2},
{"p": 300, "names": obj3},
]
count = cursor.var(oracledb.DB_TYPE_NUMBER, arraysize=len(data))
cursor.setinputsizes(p=None, names=type_obj, count=count)
cursor.executemany("begin myproc(:p, :names, :count); end;", data)
# prints "OUT bind value is [102, 203, 304]"
print(f"OUT bind value is {count.values}")Output is: |
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Thanks, this is helpful indeed! Unfortunately my code still gives me an After looking at the code in var_impl = bind_info._bind_var_impl
if var_impl.is_array:
...is false when I pass an array, but one would expect it's true? I guess that's why the IndexError is raised a few lines down when it tries to access |
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My code snippet works identically if you replace the creation of If you try Thick mode you'll probably get a DPI error message - which still won't be too useful. @anthony-tuininga has a task to look at giving a DPY error message in Thin mode. If you share a properly runnable reproducible case we can help you futher. |
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Alright, thanks to the code example from @cjbj I was able to get it working. The main issue apparently was the definition of return variables - instead of passing individual cursor variables with the bind list, they must be (additionally) passed with I can provide an updated code example later. |
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I'm glad you got it going. Doc and samples will be updated soon to help future readers. |
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That was super fast, thanks a lot! The sample code also contains my use case and provides a working solution, so I'll mark this as an answer. |
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The doc just got pushed to GH. See https://python-oracledb.readthedocs.io/en/latest/user_guide/batch_statement.html#batch-execution-of-pl-sql and https://github.com/oracle/python-oracledb/blob/main/samples/plsql_batch.py