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• 0.4.1
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• package.scala

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com.mchange.sc.v2.sql.package.scala Maven / Gradle / Ivy

package com.mchange.sc.v2

import java.sql.ResultSet

package object sql {
  final class UnexpectedRowCountException( message : String ) extends Exception( message )

  def getSingleValue[T]( extractor : ResultSet => T)( rs : ResultSet ) : T = {
    if (! rs.next() ) throw new UnexpectedRowCountException("A result set expected to contain precisely one row contained no rows at all")
    val out = extractor( rs )
    if ( rs.next() ) throw new UnexpectedRowCountException("A result set expect to contain precisely one row contained more than one row")
    out
  }

  def getSingleString( rs : ResultSet )  = getSingleValue( _.getString(1) )( rs )
  def getSingleBoolean( rs : ResultSet ) = getSingleValue( _.getBoolean(1) )( rs )
  def getSingleInt( rs : ResultSet )     = getSingleValue( _.getInt(1) )( rs )
  def getSingleLong( rs : ResultSet )    = getSingleValue( _.getLong(1) )( rs )
  def getSingleFloat( rs : ResultSet )   = getSingleValue( _.getFloat(1) )( rs )
  def getSingleDouble( rs : ResultSet )  = getSingleValue( _.getDouble(1) )( rs )
}