public Expression ConcatMethod(ConcatMethod method, LiteralExpression[] arguments)
{
if (arguments.Length == 1)
{
return(arguments[0]);
}
else if (arguments[0].LiteralType == LiteralType.Null)
{
if (arguments[1].LiteralType == LiteralType.Null)
{
return(new LiteralExpression(null, LiteralType.Null));
}
else
{
return(arguments[1]);
}
}
else if (arguments[1].LiteralType == LiteralType.Null)
{
return(arguments[0]);
}
else
{
string result =
LiteralUtil.CoerceString(arguments[0]) +
LiteralUtil.CoerceString(arguments[1]);
return(new LiteralExpression(result, LiteralType.String));
}
}
public override IProjection ConcatMethod(ConcatMethod method, Expression[] arguments)
{
if (arguments.Length == 1)
{
return(ProjectionVisitor.CreateProjection(arguments[0]));
}
else
{
return(new SqlFunctionProjection(
"concat",
NHibernateUtil.String,
ProjectionVisitor.CreateProjection(arguments[0]),
ProjectionVisitor.CreateProjection(arguments[1])
));
}
}
public virtual TResult ConcatMethod(ConcatMethod method, Expression[] arguments)
{
throw new QueryNotSupportException();
}
