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Learn how to effectively convert raw MySQL queries to Laravel ORM syntax with this detailed guide, ensuring you avoid common errors and streamline your database interactions.
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This video is based on the question https://stackoverflow.com/q/65136991/ asked by the user 'salah1337' ( https://stackoverflow.com/u/13638457/ ) and on the answer https://stackoverflow.com/a/65137115/ provided by the user 'Donkarnash' ( https://stackoverflow.com/u/1220364/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Converting MySQL Queries to Laravel ORM: A Step-by-Step Guide

When working with Laravel, many developers prefer to use its powerful Eloquent ORM (Object-Relational Mapping) for database interactions instead of writing raw SQL queries. However, if you're transitioning from traditional SQL to Laravel's query builder, it can be challenging to translate SQL syntax into Laravel syntax accurately. This guide will address such a common challenge: converting a complex SQL query into Laravel's query builder syntax.

The Problem: SQL to Laravel Conversion

Below is the SQL query that needs to be translated into Laravel's ORM:

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This query involves summing hours spent, joining tables, and applying complex filtering conditions. The challenge lies in accurately translating the syntax while maintaining the logic of the query.

The Solution: Laravel Query Builder Syntax

To convert the above SQL query into Laravel's query builder, follow these organized steps:

Step 1: Set Up the Query

Start by initiating the query using Laravel’s DB facade:

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Step 2: Select Data

To sum the Personnel_Hours_Spent, use select with DB::raw:

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Step 3: Join Tables

Add the necessary left join:

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Step 4: Apply Where Conditions

Use where to apply the filters. Note that multiple conditions must be written as arrays of arrays:

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Step 5: Use orWhere for Alternative Conditions

Next, handle alternate conditions with orWhere, making sure to follow the same array structure:

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Putting It All Together

Here is the complete conversion code:

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Conclusion

Converting SQL queries into Laravel's ORM does not have to be tedious or prone to errors. By following the structured steps outlined above, you can effectively translate your MySQL queries into a clean and maintainable Laravel syntax. Remember to ensure that your conditions are correctly formatted as arrays of arrays, preventing common errors such as "ErrorException Array to string conversion."

Now that you have the knowledge, you can upgrade your database queries with Laravel ORM confidently!