/// <summary>
/// Registers an external parameter
/// Since these can be complex expressions, we don't try to identify them
/// and push them every time
/// The only loss may be a small memory loss (if anyone can prove me that the same Expression can be used twice)
/// </summary>
/// <param name="expression"></param>
/// <param name="alias"></param>
/// <param name="builderContext"></param>
/// <returns></returns>
public virtual InputParameterExpression RegisterParameter(Expression expression, string alias, BuilderContext builderContext)
{
var queryParameterExpression = new InputParameterExpression(expression, alias);
builderContext.ExpressionQuery.Parameters.Add(queryParameterExpression);
return queryParameterExpression;
}
public virtual void UnregisterParameter(InputParameterExpression expression, BuilderContext builderContext)
{
builderContext.ExpressionQuery.Parameters.Remove(expression);
}
private static SqlStatement BuildExpression(ISqlProvider sqlProvider, InputParameterExpression inputParameterExpression)
{
var alias = inputParameterExpression.Alias;
if (inputParameterExpression.IsMutiple)
{
var parameterss = ((IEnumerable) inputParameterExpression.GetValue()).Cast<object>();
var statements = parameterss.Select((p, id) =>
{
var nameBase = string.Format("{0}{1}", alias, id);
return new SqlStatement(new SqlParameterPart(sqlProvider.GetParameterName(nameBase), nameBase));
}).ToArray();
return new SqlStatement(sqlProvider.GetLiteral(statements));
}
return new SqlStatement(new SqlParameterPart(sqlProvider.GetParameterName(alias), alias));
}