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 capture and group query errors in your Go app so you can see exactly which queries are failing, how often, and with what parameters.