How to Fix Query Error in Go

Stumbled on a query error in your Go application? This common issue has a well-known fix that you can apply in minutes.

Common Causes

Query errors in Go usually stem from one of these issues:

• Malformed SQL syntax or incorrect query builder usage
• Missing, null, or incorrectly typed parameters
• Type mismatches between query parameters and database column types
• Attempting to access results from an empty result set
• Connection pool exhaustion under high load

The Fix

// Handle query errors with specific error types
row := db.QueryRow(
    "SELECT name, email FROM users WHERE id = $1", userID,
)
var name, email string
if err := row.Scan(&name, &email); err != nil {
    if errors.Is(err, sql.ErrNoRows) {
        return fmt.Errorf("user %d not found", userID)
    }
    return fmt.Errorf("query failed: %w", err)
}

Use errors.Is(err, sql.ErrNoRows) to distinguish between missing data and actual query failures.

Preventing Query Errors

• Use an ORM or query builder to reduce raw SQL mistakes and prevent injection
• Validate input types before passing them to queries
• Handle empty results explicitly rather than assuming data always exists
• Log the full query text (without sensitive data) when errors occur for debugging
• Monitor slow queries to catch performance issues before they become errors

Let [Bugsly](https://bugsly.dev) capture and group query errors in your Go app so you can see exactly which queries are failing, how often, and with what parameters.