Fixes apache#7704

lib/go-tc/parameters.go

@@ -27,6 +27,7 @@ import (
 	"fmt"
 	"strconv"
 	"strings"
+	"time"
 
 	"github.com/apache/trafficcontrol/lib/go-util"
 
@@ -69,6 +70,51 @@ type ParameterNullable struct {
 	Value       *string         `json:"value" db:"value"`
 }
 
+// ParametersResponseV5 is an alias for the latest minor version for the major version 5.
+type ParametersResponseV5 = ParametersResponseV50
+
+// ParametersResponseV50 is the type of the response from Traffic Ops to GET
+// requests made to the /parameters and /profiles/name/{{Name}}/parameters
+// endpoints of its API.
+type ParametersResponseV50 struct {
+	Response []Parameter `json:"response"`
+	Alerts
+}
+
+// ParameterV5 is an alias for the latest minor version for the major version 5.
+type ParameterV5 = ParameterV50
+
+// A ParameterV50 defines some configuration setting (which is usually but
+// definitely not always a line in a configuration file) used by some Profile
+// or Cache Group.
+type ParameterV50 struct {
+	ConfigFile  string          `json:"configFile" db:"config_file"`
+	ID          int             `json:"id" db:"id"`
+	LastUpdated time.Time       `json:"lastUpdated" db:"last_updated"`
+	Name        string          `json:"name" db:"name"`
+	Profiles    json.RawMessage `json:"profiles" db:"profiles"`
+	Secure      bool            `json:"secure" db:"secure"`
+	Value       string          `json:"value" db:"value"`
+}
+
+// ParameterNullableV5 is an alias for the latest minor version for the major version 5.
+type ParameterNullableV5 = ParameterNullableV50
+
+// ParameterNullableV50 is exactly like Parameter except that its properties are
+// reference values, so they can be nil.
+type ParameterNullableV50 struct {
+	//
+	// NOTE: the db: struct tags are used for testing to map to their equivalent database column (if there is one)
+	//
+	ConfigFile  *string         `json:"configFile" db:"config_file"`
+	ID          *int            `json:"id" db:"id"`
+	LastUpdated *time.Time      `json:"lastUpdated" db:"last_updated"`
+	Name        *string         `json:"name" db:"name"`
+	Profiles    json.RawMessage `json:"profiles" db:"profiles"`
+	Secure      *bool           `json:"secure" db:"secure"`
+	Value       *string         `json:"value" db:"value"`
+}
+
 // ProfileParameterByName is a structure that's used to represent a Parameter
 // in a context where they are associated with some Profile specified by a
 // client of the Traffic Ops API by its Name.

traffic_ops/traffic_ops_golang/dbhelpers/db_helpers.go

@@ -2263,6 +2263,21 @@ func PhysLocationExists(tx *sql.Tx, id string) (bool, error) {
 	return true, nil
 }
 
+// ParameterExists confirms whether the Parameter exists, and an error (if one occurs).
+func ParameterExists(tx *sql.Tx, id string) (bool, error) {
+	var count int
+	if err := tx.QueryRow("SELECT count(name) FROM parameter WHERE id=$1", id).Scan(&count); err != nil {
+		return false, fmt.Errorf("error getting Parameter info: %w", err)
+	}
+	if count == 0 {
+		return false, nil
+	}
+	if count != 1 {
+		return false, fmt.Errorf("getting Parameter info - expected row count: 1, actual: %d", count)
+	}
+	return true, nil
+}
+
 // GetCoordinateID obtains coordinateID, and an error (if one occurs)
 func GetCoordinateID(tx *sql.Tx, id int) (*int, error) {
 	q := `SELECT coordinate FROM cachegroup WHERE id = $1`