How to Correctly Use LIKE Queries with pq Driver in Go and PostgreSQL?

Understanding LIKE Query Syntax in Go with PostreSQL

When working with Go and PostreSQL using the pq driver, you may encounter syntax errors when executing LIKE queries. This issue arises from the % character used to represent like patterns.

Issue:

You encounter a syntax error while executing the following query:

SELECT p.id, p.name, p.description, p.price, p.image, p.rate
FROM products AS p
WHERE LOWER(p.name) LIKE %% ORDER BY p.rate DESC

Solution:

To resolve this syntax error, you need to enclose the LIKE pattern in single quotes:

SELECT p.id, p.name, p.description, p.price, p.image, p.rate
FROM products AS p
WHERE LOWER(p.name) LIKE '%' ||  || '%'
ORDER BY p.rate DESC;

In this revised query, we enclose the like pattern %$1% in single quotes to prevent the driver from interpreting the % character as a wildcard for parameters.

Updated Go Code:

query := `SELECT p.id, p.name, p.description, p.price, p.image, p.rate
FROM products AS p
WHERE LOWER(p.name) LIKE '%' ||  || '%'
ORDER BY p.rate DESC`

With this fix, the query will be able to execute successfully without encountering the syntax error.

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