https://github.com/steve-chavez/pltinyexpr

PostgreSQL toy language handler for learning purposes.
https://github.com/steve-chavez/pltinyexpr

Last synced: about 1 month ago
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PostgreSQL toy language handler for learning purposes.

• Host: GitHub
• URL: https://github.com/steve-chavez/pltinyexpr
• Owner: steve-chavez
• License: mit
• Created: 2023-06-05T04:46:29.000Z (over 1 year ago)
• Default Branch: main
• Last Pushed: 2023-06-22T16:31:54.000Z (over 1 year ago)
• Last Synced: 2024-03-17T09:34:47.389Z (8 months ago)
• Language: C
• Homepage:
• Size: 13.7 KB
• Stars: 1
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# PL/tinyexpr

PL/tinyexpr is a procedural language handler created for learning purposes.

It evaluates math expressions using https://github.com/codeplea/tinyexpr.

## Installation

```bash

make && sudo make install

```

## Usage

```sql

create extension pltinyexpr;

```

It runs functions with parameters:

```sql

create or replace function sample(a float8, b float8) returns float8 as $$

  abs(sqrt(a^2) - 5*b)

$$ language pltinyexpr;

-- all the functions in tinyexpr are supported https://github.com/codeplea/tinyexpr/#functions-supported

select sample(9,2);

 sample

--------

      1

(1 row)

```

It validates function's signatures:

```sql

create or replace function sample(x text) returns float8 as $$

	x + 4

$$ language pltinyexpr;

ERROR:  only parameters of double precision or float8 types are allowed

```

It runs inline expressions, but they only LOG their result:

```sql

DO LANGUAGE pltinyexpr $$

  5 * 4

$$;

INFO:  expression result is: 20.000000

DO

```

## Testing

```bash

make installcheck

```