public virtual string Count(Expression <Func <T, bool> > predicate)
{
var query = new StringBuilder();
if (!string.IsNullOrWhiteSpace(_ordering))
{
throw new InvalidOperationException("'Count()' and 'ORDER BY' conditions can't be used together");
}
var entityName = QueryBuilderHelper.GetFluentEntityName <T>();
var selector = string.Format("SELECT count() FROM {0} ", entityName);
query.AppendLine(selector);
var condition = predicate.Parse();
if (!string.IsNullOrWhiteSpace(_condition))
{
_condition = string.Format("{0} AND ({1}) ", _condition, condition);
}
else
{
_condition = string.Format("WHERE ({0}) ", condition);
}
query.AppendLine(_condition);
if (!string.IsNullOrWhiteSpace(_limit))
{
query.AppendLine(_limit);
}
return(query.ToString());
}
public virtual string Count()
{
if (!string.IsNullOrWhiteSpace(_ordering))
{
throw new InvalidOperationException("'Count()' and 'ORDER BY' conditions can't be used together");
}
var query = new StringBuilder();
var entityName = QueryBuilderHelper.GetFluentEntityName <T>();
var selector = string.Format("SELECT count() FROM {0} ", entityName);
query.AppendLine(selector);
if (!string.IsNullOrWhiteSpace(_condition))
{
query.AppendLine(_condition);
}
if (!string.IsNullOrWhiteSpace(_limit))
{
query.AppendLine(_limit);
}
return(query.ToString());
}
protected virtual string GetSelector <TOut>() where TOut : class, new()
{
var entityName = QueryBuilderHelper.GetFluentEntityName <T>();
var propertyNames = QueryBuilderHelper.GetFluentPropertyNames <TOut>();
var selector = string.Format("SELECT {0} FROM {1} ", string.Join(", ", propertyNames), entityName);
return(selector);
}
protected virtual string GetSelector <TOut>(Expression <Func <T, TOut> > predicate)
{
var entityName = QueryBuilderHelper.GetFluentEntityName <T>();
var propertyName = predicate.ParseMemberExpression();
if (string.IsNullOrWhiteSpace(propertyName))
{
throw new ArgumentException("Argument 'predicate' should be a member access expression.");
}
var selector = string.Format("SELECT {0} FROM {1} ", propertyName, entityName);
return(selector);
}
