How to diagnose and fix the 22031 invalid_argument_for_sql_json_datetime_function error code in Postgres.

The 22031 error code in PostgreSQL, indicated by invalid_argument_for_sql_json_datetime_function, suggests that there is an issue with the arguments provided to a JSON datetime function. This error can occur when you are attempting to use a function that operates on JSON data to extract or manipulate datetime values, but the provided arguments are not valid or correctly formatted.

Here are a few examples of how this error might occur and how to diagnose and fix it:

  1. Incorrect JSON Path:
    When using the jsonb data type’s functions to extract datetime values, ensure that the JSON path specified is correct and leads to a datetime value. Example of an incorrect JSON path:
   SELECT jsonb_path_query_first('{"timestamp": "2020-01-01T12:00:00Z"}', '$.nonexistent_path')::timestamp;

To fix this, correct the JSON path to point to the actual datetime value:

   SELECT jsonb_path_query_first('{"timestamp": "2020-01-01T12:00:00Z"}', '$.timestamp')::timestamp;
  1. Invalid JSON Format:
    The JSON value must be in a valid format that can be interpreted as a datetime. If the format is incorrect, PostgreSQL will raise the 22031 error. Example of invalid JSON datetime format:
   SELECT jsonb_path_query_first('{"timestamp": "2020-01-01 12:00:00"}', '$.timestamp')::timestamp;

To fix this, provide the datetime in an ISO 8601 format that PostgreSQL can understand:

   SELECT jsonb_path_query_first('{"timestamp": "2020-01-01T12:00:00Z"}', '$.timestamp')::timestamp;
  1. Using Functions That Expect Datetime:
    When using functions like jsonb_to_tsvector, which expect datetime values, ensure that the JSON data contains valid datetime information. Example of using jsonb_to_tsvector with invalid data:
   SELECT jsonb_to_tsvector('{"date": "not a date"}');

To fix this, ensure that the JSON contains a valid datetime:

   SELECT jsonb_to_tsvector('{"date": "2020-01-01T12:00:00Z"}');

To diagnose the 22031 error, carefully review the arguments you are passing to the SQL/JSON datetime function. Ensure that any JSON paths are correct and that the data at those paths is in a valid datetime format. Correct any issues with the arguments and retry the operation.

The search results provided do not contain specific information about resolving the 22031 error code in PostgreSQL, but the general guidance and examples above should help you address issues related to invalid arguments for SQL/JSON datetime functions in PostgreSQL.

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