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Скачать или смотреть How to Execute PostgreSQL Script Queries in C- Npgsql

  • vlogize
  • 2025-04-03
  • 2
How to Execute PostgreSQL Script Queries in C- Npgsql
How to execute postgresql script query in C# Npgsqlc#postgresqldappernpgsql
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Описание к видео How to Execute PostgreSQL Script Queries in C- Npgsql

Discover how to execute complex PostgreSQL script queries using C- and Npgsql effectively. Learn to manage parameters and handle transactions seamlessly in your applications.
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This video is based on the question https://stackoverflow.com/q/75768231/ asked by the user 'LordDraagon' ( https://stackoverflow.com/u/5765939/ ) and on the answer https://stackoverflow.com/a/75769277/ provided by the user 'Shay Rojansky' ( https://stackoverflow.com/u/640325/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How to execute postgresql script query in C- Npgsql

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The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
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How to Execute PostgreSQL Script Queries in C- Npgsql: A Comprehensive Guide

Navigating database interactions within a C- application can often pose challenges, particularly when dealing with complex queries in PostgreSQL. One common issue developers encounter is executing PostgreSQL script queries that utilize certain keywords, such as DO and DECLARE. If you're finding it tough to run such scripts through C- using Npgsql, fret not—we’ve got you covered!

Understanding the Problem

In your C- implementation, you have defined a method to insert policies into your PostgreSQL database using the PoliciesInsert function, which contains a complex SQL script. However, while attempting to execute this script, you encountered the following error:

Error: 42703: column "_policy" does not exist

This error indicates that the PostgreSQL engine is unable to recognize the parameters being passed to the query, particularly due to the use of the DO block, which restricts the use of parameters in its context.

Why This Happens

Anonymous DO Blocks: In PostgreSQL, a DO block is an anonymous code block that can execute procedural code without requiring a function definition. However, it does not support parameterized queries directly. This means you can't use the usual parameter placeholders (like -_Policy) within the body of a DO statement.

Parameter Mapping Issue: The database expects variables without the - prefix in a DO block, leading to confusion when trying to pass in parameters.

Proposed Solutions

To resolve the issue effectively, consider the following approaches:

1. Convert the DO Block to a Stored Procedure

One of the best practices is to define a stored procedure or function in PostgreSQL. This allows you to pass parameters and encapsulate your logic efficiently. Here’s how you could define and call a stored procedure:

Step 1: Define the Procedure
You would define a stored procedure in PostgreSQL that accepts parameters. For instance:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Call the Procedure from C-
Then, you can call this procedure from your C- application like this:

[[See Video to Reveal this Text or Code Snippet]]

2. Use Literal Values Directly (Least Recommended)

If creating a stored procedure isn't feasible for your scenario, another alternative is to insert parameter values directly inside the DO block. While this method can work, it’s crucial to ensure you properly sanitize any values coming from user input to prevent SQL injection vulnerabilities.

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

Executing PostgreSQL script queries from C- using Npgsql can certainly present challenges, especially when utilizing advanced features such as DO blocks. By transitioning to stored procedures or adjusting your query to eliminate the need for parameters within DO blocks, you can effectively streamline your database interactions.

Hopefully, these solutions help you overcome the current obstacles in your application and lead you to a smoother coding experience moving forward. Happy coding!

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