bulk_insert | Efficient bulk inserts with ActiveRecord | SQL Database library
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Efficient bulk inserts with ActiveRecord
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QUESTION
I'm trying to use Alembic's bulk_insert in the migration file to get some data to my database for testing purposes. This is my database creation code:
ANSWER
Answered 2022-Apr-07 at 21:52I think the issue isn't that they are missing but that the dictionaries have different keys. Try setting the params that appear sometimes and sometimes not to None. I think the statement is compiled and then re-used over and over again, it is probably based on the first set of values in the list. So later calls fail when the dictionary differs. I think this is explained here executing-multiple-statements
ExampleWhen executing multiple sets of parameters, each dictionary must have the same set of keys; i.e. you cant have fewer keys in some dictionaries than others. This is because the Insert statement is compiled against the first dictionary in the list, and it’s assumed that all subsequent argument dictionaries are compatible with that statement.
QUESTION
Assuming an existing mysql table, "user".
Assuming a single column primary key "id".
Assuming the data to be inserted is always given as a list of dictionaries, in the form:
[{'column_name1':'valueA', 'column_name2':'valueB'}, {'column_name1':'valueC', 'column_name2':'valueD'}].
If a row is inserted with the same primary key (aka id), I'd like to just update the values of all the other columns.
...ANSWER
Answered 2021-Jul-09 at 14:29I went with this:
QUESTION
I am trying to use the redisgraph-bulk-loader to load the dataset into the RedisGraph instance running in a docker container. However, it returns with IndexError: list index out of range which I do not understand. I have read the documentation and my CSV files are valid.
I have opened an issue here.
Command :
$ redisgraph-bulk-loader DemoGraph --enforce-schema --nodes-with-label TBox import/nodes.csv --relations-with-type relations import/relationships.csv
Log :
...ANSWER
Answered 2021-Apr-20 at 15:54The error you're encountering occurs at this line - https://github.com/RedisGraph/redisgraph-bulk-loader/blob/master/redisgraph_bulk_loader/entity_file.py#L233 .
At this point, we are trying to retrieve the type specified after the colon in a specific field of a header line. As such, an IndexError indicates that no colon was found in one of the fields.
Looking at relationship.csv, I see that the header row ends with "properties__title","properties__uri","end__labels__002". These columns should have a colon-separated type, like the preceding fields.
QUESTION
I am trying to load CSV files, which include a YYYY-MM-DD date format, to oracle database. But, always ended up with "DatabaseError: ORA-01861: literal does not match format string".
I think it needs a type of TO-DATE get invloved, but don'w know to to implement it in batch mode.
...ANSWER
Answered 2021-Apr-09 at 11:09Assuming that contract_date is the only date column, you probably want
QUESTION
Below are the few issues I am getting when I am trying to upload a file with around one million records. Help me on resolving the issues. When I am try to find the solution in blogs, all are suggesting to modify some logic. But I am using redisgraph-bulk-loader utility directly.
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe8 in position 3565: invalid continuation byte
_csv.Error: line contains NULL byte
Not working if column value contains quotes and comma.
redisgraph_bulk_loader.bulk_insert.CSVError: /home/ec2-user/test.csv:2 Expected 4 columns, encountered 5 ('1,3,4,"5,6"')
GraphName should be unique always for each new upload. In this case, if I want to add some more nodes to same graph or if I want establish relationships from some other file how to achieve this.
...ANSWER
Answered 2020-Jun-12 at 14:24As answered in the issue you opened on the redisgraph-bulk-loader repository:
Not working if column value contains quotes and comma.
This may be resolvable by using the --quote argument to change input-quoting behavior. The next suggestion would render this unnecessary, however.
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe8 in position 3565: invalid continuation byte _csv.Error: line contains NULL byte
These may also be problems with type inference logic. You may wish to try using an updated branch (to be merged soon) that introduces enforced schema; this will solve your first problem as well.
git checkout improve-loader-logic
And updated your header rows as described in the updated branch's docs.
If this does not resolve your issues, you may need to look deeper into encoding problems.
GraphName should be unique always for each new upload. In this case, if I want to add some more nodes to same graph or if I want establish relationships from some other file how to achieve this.
The bulk loader is a one-time tool, and currently all updates to existing graphs must be made using Cypher queries.
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