Скачать или смотреть Solving the Issue of Postgresql Function Not Returning Results with HeidiSQL

Discover how to fix the problem of your Postgresql function created with HeidiSQL not returning results. This guide provides a step-by-step solution and helpful tips for effective query execution.
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Fixing Your PostgreSQL Function Not Returning Results in HeidiSQL

When working with PostgreSQL, you might encounter issues with functions you’ve created that do not return the expected results. One such common problem arises when calling a function through HeidiSQL, leading to frustration for those who are new to PostgreSQL. If you’ve found yourself in this situation, rest assured that there are solutions to explore. Let’s break it down step-by-step.

Understanding the Problem

You’re trying to create a PostgreSQL function that loops through a set of table names and retrieves specific data (in this case, the lastupdate field). The function is supposed to provide you with results, but instead, you're facing an error indicating an unknown datatype, and no results are returned when you execute it. The essential parts of the function look like this:

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The main issues here stem from how the results are being handled and how the function is being called.

Steps to Fix the Issue

1. Modify the Function to Return Results

The core of the problem is that the function is defined to return void, which means it doesn’t return any value. You’ll need to change the return type to something meaningful, like date, to hold the value of lastupdate you want to retrieve.

2. Use the INTO Clause

When you’re executing a SQL statement inside your function, you need to store the result into a variable. This is done through the INTO clause in the EXECUTE command. Here’s how to modify your function:

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3. Calling the Function Correctly

When you invoke the function, make sure you are not using double quotes unless you specifically defined the function name with double quotes. In general, you do not need double quotes for identifiers in PostgreSQL. Simply call the function like this:

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4. Check and Validate Result

After making these changes, execute the function as follows:

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If performed correctly, you should receive a result reflecting the latest lastupdate from your tables:

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Conclusion

By following these steps, you should be able to resolve the issue with your PostgreSQL function created in HeidiSQL that wasn’t returning results. Remember to adjust both the return type and use the INTO clause for executed commands within your function. As you continue to learn PostgreSQL, these adjustments will enhance your ability to write effective and functional queries.

If you have any further questions or encounter additional issues, don’t hesitate to reach out to the PostgreSQL community or consult more resources.