processmaker/pmql

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An Eloquent trait that provides the pmql scope to allow converting simple sql criteria clauses to Eloquent

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github.com/ProcessMaker/pmql

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Type:project

1.12.1 2023-12-08 03:35 UTC

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Unknown License 3c16be4df42f53b64ec96d17e0ffc310752bf223

  • Taylor Dondich <taylor.woop@processmaker.com>

This package is auto-updated.

Last update: 2024-11-08 09:49:07 UTC

README

ProcessMaker Query Language

Support for simple SQL-like expressions and converting to Laravel Eloquent. Exposes a Eloquent scope 'pmql' to pass in clauses.

Table of Contents

Simple Usage

$results = Record::where('id', '<', 500)->pmql('username = "foobar" AND age < 25')->get();

Operators

Comparison Operators

Logical Operators

Case Sensitivity

Note that PMQL syntax is not case sensitive. However, queries are case sensitive. For example, if querying for a string, PMQL will return results only if the case matches your query exactly. This may be bypassed by utilizing the lower(field) syntax. Examples are provided below.

Casting

Fields can be cast to various data types using the cast(field as type) syntax. Currently supported types are text and number. Examples are provided below.

Dates

Strings entered in the format "YYYY-MM-DD" are interpreted as dates and can be used in comparative queries. Dates can be compared dynamically based on the current time utilizing the now keyword. Arithmetic operations can be performed on dates using the date (+ or -)number interval syntax. The interval can be either day, hour, minute, or second. Examples are provided below.

Syntax Examples

Sample Dataset

Let's say we are managing a roster for a basketball team.

Basic Syntax

Find players with a specific last name.

Query

last_name = "Young"

Result

And

Find players with a specific last name in a specific position.

Query

last_name = "Young" and position = "forward"

Result

Or

Find players in two different positions.

Query

position = "center" or position = "forward"

Result

IN

Similar to multiple OR operators, find players with last names Colson or Young

Query

last_name IN ["Colson", "Young"]

Result

NOT IN

List all players without the last name Colson or Young

Query

last_name NOT IN ["Colson", "Young"]

Result

Grouping

Find players matching grouped criteria:

Query

(position = "center" or position = "forward") and starter = "true"

Result

Numeric Comparison

Find players based on years of experience.

Query

experience > 8

Result

Casting To Number

What if a field we want to compare mathematically is stored as a string instead of an integer? No problem. We can simply cast it as a number.

Let's say our dataset has changed to store the experience field as a string but we want to find all players with 2 years of experience or less.

Query

cast(experience as number) <= 2

Result

Date Comparison

Find players born before 1990.

Query

dob < "1990-01-01"

Result

Dynamic Date Comparison

Find players under 25 as of right now. We utilize the now keyword and subtract 9,125 days (365 * 25 = 9,125).

Query

dob > now -9125 day

Result

Pattern Matching

We can use the LIKE operator to perform pattern matching with a field. % is a wildcard which matches zero, one, or more characters. _ is a wildcard which matches one character.

Start of String

Let's find all players whose last names begin with the letter P.

Query
last_name like "P%"
Result

Exact Pattern

Let's find all players whose last names begin with P and have three letters after that.

Query
last_name like "P___"
Result

End of String

Let's find all players whose last names end in "son."

Query
last_name like "%son"
Result

String Contains

Let's find all players whose names contain "am."

Query
first_name like "%am%" or last_name like "%am%"
Result

Ignore Case

Let's find all players whose names contain "de" regardless of capitalization.

Query
lower(first_name) like "%de%" or lower(last_name) like "%de%"
Result

Custom Callbacks

You can utilize custom callbacks in your pmql call to override behavior for a specific expression

$results = Record::where('id', '<', 500)->pmql('username = "FOOBAR" AND age < 25', function($expression) {
    // This example will ensure checking for lowercase usernames as thats how it stored in our database
    if($expression->field->field() == 'username') {
        // If you want to modify the query, you need to return an anonymous function that will add your additional criteria
        return function($query) use($expression) {
                $query->where(DB::raw('LOWER(username)', $expression->operator, strtolower($expression->value->value()));
        }
    }
    // Let default behavior win for non username fields
    return false;
})->get();