How to Solve 'unsupported driver -> Scan pair: []uint8 -> *time.Time' Error While Parsing Time from MySQL in Go?

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How to Handle Time Parsing from Database in Go

Encountering errors while retrieving time values from a MySQL database can be frustrating. This article addresses the specific error "unsupported driver -> Scan pair: []uint8 -> *time.Time" and provides solutions using the popular go-sql-driver/mysql library.

Solution: Enable Automatic Parsing

The go-sql-driver/mysql offers support for automatic parsing of DATE and DATETIME columns into time.Time values. To enable this feature, append the parameter "parseTime=true" to your connection string. Once enabled, queries like SELECT current_timestamp() will automatically map to the desired time format.

Custom Parsing for Specific Cases

For cases where automatic parsing is not suitable or unavailable (e.g., retrieving current_time()), custom parsing is required.

Step 1: Create a Custom Type

Define a custom type that wraps raw byte slices ([]byte) and implements a Time() method to parse time values into time.Time. For example:

type rawTime []byte

func (t rawTime) Time() (time.Time, error) {
    return time.Parse("15:04:05", string(t))
}

Step 2: Use Custom Type in Scan

In your scanning code, replace the direct reference to time.Time with your custom type:

var myTime rawTime
rows, err = db.Query("SELECT current_time()")
if err = rows.Scan(&myTime); err != nil {
    // Handle error
}

Step 3: Convert Raw Time to Parsed Time

Finally, call Time() on your custom type to retrieve the parsed time value:

fmt.Println(myTime.Time())

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