MySQL examples (#501)

* Update README.md

* Update index.ts

plugins/sql/guest-js/index.ts

@@ -76,10 +76,29 @@ export default class Database {
    *
    * @example
    * ```ts
+   * // for sqlite & postgres
+   * // INSERT example
+   * const result = await db.execute(
+   *    "INSERT into todos (id, title, status) VALUES ($1, $2, $3)",
+   *    [ todos.id, todos.title, todos.status ]
+   * );
+   * // UPDATE example
    * const result = await db.execute(
    *    "UPDATE todos SET title = $1, completed = $2 WHERE id = $3",
    *    [ todos.title, todos.status, todos.id ]
    * );
+   *
+   * // for mysql
+   * // INSERT example
+   * const result = await db.execute(
+   *    "INSERT into todos (id, title, status) VALUES (?, ?, ?)",
+   *    [ todos.id, todos.title, todos.status ]
+   * );
+   * // UPDATE example
+   * const result = await db.execute(
+   *    "UPDATE todos SET title = ?, completed = ? WHERE id = ?",
+   *    [ todos.title, todos.status, todos.id ]
+   * );
    * ```
    */
   async execute(query: string, bindValues?: unknown[]): Promise<QueryResult> {
@@ -91,13 +110,11 @@ export default class Database {
         values: bindValues ?? [],
       },
     );
-
     return {
       lastInsertId,
       rowsAffected,
     };
   }
-
   /**
    * **select**
    *
@@ -105,9 +122,15 @@ export default class Database {
    *
    * @example
    * ```ts
+   * // for sqlite & postgres
    * const result = await db.select(
    *    "SELECT * from todos WHERE id = $1", id
    * );
+   *
+   * // for mysql
+   * const result = await db.select(
+   *    "SELECT * from todos WHERE id = ?", id
+   * );
    * ```
    */
   async select<T>(query: string, bindValues?: unknown[]): Promise<T> {