/// <summary>
/// 解析 orderby 语句
/// </summary>
/// <param name="orderByClause"></param>
/// <param name="queryModel"></param>
/// <param name="index"></param>
public override void VisitOrderByClause(OrderByClause orderByClause, QueryModel queryModel, int index)
{
foreach (var ordering in orderByClause.Orderings)
{
MySqlOrderByPartsCommandBuilder orderBuilder = new MySqlOrderByPartsCommandBuilder();
MySqlOrderByClauseVisitor visitor = new MySqlOrderByClauseVisitor();
visitor.Translate(ordering.Expression, orderBuilder);
string direction = ordering.OrderingDirection == OrderingDirection.Desc ? "desc" : "asc";
commandBuilder.OrderByParts.Add(string.Format("{0} {1}", orderBuilder.ToString(), direction));
}
base.VisitOrderByClause(orderByClause, queryModel, index);
}
/// <summary>
/// 翻译表达式
/// </summary>
/// <returns></returns>
public void Translate(Expression expression, MySqlOrderByPartsCommandBuilder commandBuilder)
{
this.commandBuilder = commandBuilder;
this.VisitExpression(expression);
}
