How to Identify a \'Database Does Not Exist\' Error Using `db.Exec(...)` in Go?

How to Determine a specific Error Condition from db.Exec(...) in Go?

In an attempt to delete a Postgres database using the lib/pq driver, developers may encounter a challenge in differentiating between standard and "database does not exist" errors. To effectively handle these scenarios, it is essential to understand the error handling mechanism provided by the driver.

The lib/pq package returns errors as *pq.Error structs, offering various fields for detailed error inspection. To access these fields, use the following code:

<code class="go">if err, ok := err.(*pq.Error); ok {
    // Manipulate err.Code, err.Message, etc.
}</code>

*pq.Error provides the following fields:

<code class="go">type Error struct {
    Severity         string
    Code             ErrorCode
    Message          string
    Detail           string
    Hint             string
    Position         string
    InternalPosition string
    InternalQuery    string
    Where            string
    Schema           string
    Table            string
    Column           string
    DataTypeName     string
    Constraint       string
    File             string
    Line             string
    Routine          string
}</code>

Each field represents a specific error aspect, such as error severity, code, message, and related database objects. For the specific case of "database does not exist" errors, consult the Postgres documentation to determine the corresponding error code and perform comparisons against err.Code as needed: https://www.postgresql.org/docs/current/errcodes-appendix.html

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