How to Correctly Use LIKE Queries with Go's pq Driver for PostgreSQL?

Go PostgreSQL LIKE Query

When querying a PostgreSQL database with the Go pq driver, it's essential to understand how to handle LIKE queries correctly. One issue that may arise is the inclusion of percent signs (%) in the LIKE pattern, which can lead to syntax errors in Go.

The original query provided in the question is as follows:

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`

However, this query fails with the error "pq: syntax error at or near "%" in Go due to the percent signs. To resolve this issue, it's necessary to enclose the like pattern (%$1%) in single quotes:

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`

Adding the single quotes tells PostgreSQL that the value after LIKE is a string and that it should be used as the search pattern. By surrounding the LIKE pattern with the double pipe (||) operator and single quotes, the query is parsed correctly by the pq driver and the LIKE search can be performed.

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