Use struct instead of map[string]string for connection params

connection_pool.go

@@ -2,25 +2,22 @@ package pgx
 
 type ConnectionPool struct {
 	connectionChannel chan *Connection
-	options           map[string]string // options used when establishing connection
+	parameters        ConnectionParameters // options used when establishing connection
 	MaxConnections    int
 }
 
 // options: options used by Connect
 // MaxConnections: max simultaneous connections to use (currently all are immediately connected)
-func NewConnectionPool(options map[string]string, MaxConnections int) (p *ConnectionPool, err error) {
+func NewConnectionPool(parameters ConnectionParameters, MaxConnections int) (p *ConnectionPool, err error) {
 	p = new(ConnectionPool)
 	p.connectionChannel = make(chan *Connection, MaxConnections)
 	p.MaxConnections = MaxConnections
 
-	p.options = make(map[string]string)
-	for k, v := range options {
-		p.options[k] = v
-	}
+	p.parameters = parameters
 
 	for i := 0; i < p.MaxConnections; i++ {
 		var c *Connection
-		c, err = Connect(options)
+		c, err = Connect(p.parameters)
 		if err != nil {
 			return
 		}