PostgreSQL · January 2, 2024

How to fix PostgreSQL Error Code: 2203A - sql_json_member_not_found

How to Fix PostgreSQL Error Code: 2203A - sql_json_member_not_found

PostgreSQL is a powerful open-source relational database management system that is widely used for various applications. However, like any software, it can encounter errors that may disrupt its normal operation. One such error is the PostgreSQL Error Code: 2203A - sql_json_member_not_found. In this article, we will explore the causes of this error and provide solutions to fix it.

Understanding the Error

The PostgreSQL Error Code: 2203A - sql_json_member_not_found occurs when a JSON object does not contain the specified member. This error typically arises when attempting to access a non-existent member within a JSON object using the "->" operator.

For example, consider the following query:

SELECT json_column -> 'non_existent_member' FROM table_name;

If the 'non_existent_member' does not exist within the JSON object stored in the 'json_column' column, PostgreSQL will throw the sql_json_member_not_found error.

Possible Causes

There are several reasons why this error may occur:

  • The JSON object does not contain the specified member.
  • The JSON object is null or empty.
  • The column or table name is incorrect.

Fixing the Error

To resolve the PostgreSQL Error Code: 2203A - sql_json_member_not_found, you can take the following steps:

1. Check JSON Object

Ensure that the JSON object contains the specified member. Double-check the key name and verify its existence within the JSON object. If the member is missing, you can either modify the JSON object or update your query accordingly.

2. Handle Null or Empty JSON Objects

If the JSON object can be null or empty, you should handle this scenario in your query. You can use the "IS NULL" or "IS NOT NULL" condition to check for null values and the "jsonb_typeof" function to determine if the JSON object is empty.

SELECT CASE
         WHEN json_column IS NULL THEN 'Handle null case'
         WHEN jsonb_typeof(json_column) = 'object' AND json_column -> 'member' IS NULL THEN 'Handle empty object case'
         ELSE json_column -> 'member'
       END
FROM table_name;

3. Verify Column and Table Names

Ensure that the column and table names in your query are correct. A simple typo can lead to the sql_json_member_not_found error. Double-check the names and make any necessary corrections.

Summary

In conclusion, the PostgreSQL Error Code: 2203A - sql_json_member_not_found occurs when a JSON object does not contain the specified member. To fix this error, you should verify the existence of the member within the JSON object, handle null or empty JSON objects appropriately, and ensure the accuracy of column and table names in your query.

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