Monkey patch scalikejdbc String binder to support UTF8 for MySQL VARBINARY columns

patchScalikejdbcStringBinder.scala

import scalikejdbc._

package object models {
  val stringUTF8: Binders[String] = Binders((rs, index) => new String(rs.getBytes(index), "UTF-8"))((rs, label) => new String(rs.getBytes(label), "UTF-8"))(v => (ps, idx) => ps.setBytes(idx, v.getBytes("UTF-8")))

  { // patch TypeBinder.string
    val field = TypeBinder.getClass.getDeclaredField("string")
    field.setAccessible(true)
    field.set(TypeBinder, stringUTF8)
  }

  { // patch ParameterBinderFactory.stringParameterBinderFactory
    val field = ParameterBinderFactory.getClass.getDeclaredField("stringParameterBinderFactory")
    field.setAccessible(true)
    field.set(ParameterBinderFactory, stringUTF8)
  }
}