/// <summary>
/// Adds "<paramref name="columnName" /> in (<paramref name="parameters" />.ParameterName, ...)"
/// expression to the clause.
/// If <paramref name="parameters"/> is null or contains no elements then nothing will be added.
/// </summary>
public static SqlClause AddIn(this SqlClause sqlClause,
[NotNull] string columnName,
[CanBeNull] IEnumerable <IDbDataParameter> parameters)
{
if (parameters == null)
{
return(sqlClause);
}
var list = parameters as IReadOnlyList <IDbDataParameter>;
if (list == null)
{
list = parameters.ToList();
}
if (list.Count == 0)
{
return(sqlClause);
}
if (list.Count == 1)
{
return(sqlClause.AddEquals(columnName, list[0]));
}
var expression = new StringBuilder(columnName);
expression.Append(" in (");
for (var k = 0; k < list.Count; k++)
{
var p = list[k];
if (k > 0)
{
expression.Append(", ");
}
expression.Append(p.ParameterName);
sqlClause.Add(p);
}
expression.Append(')');
sqlClause.Add(expression.ToString());
return(sqlClause);
}