Add docs and example for JSON

example_json_test.go

@@ -0,0 +1,36 @@
+package pgx_test
+
+import (
+	"fmt"
+	"github.com/jackc/pgx"
+)
+
+func Example_JSON() {
+	conn, err := pgx.Connect(*defaultConnConfig)
+	if err != nil {
+		fmt.Printf("Unable to establish connection: %v", err)
+		return
+	}
+
+	type person struct {
+		Name string `json:"name"`
+		Age  int    `json:"age"`
+	}
+
+	input := person{
+		Name: "John",
+		Age:  42,
+	}
+
+	var output person
+
+	err = conn.QueryRow("select $1::json", input).Scan(&output)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	fmt.Println(output.Name, output.Age)
+	// Output:
+	// John 42
+}