private static string GetJoinSql(DataTable chainRoot, SqlDefinition exp)
{
StringBuilder sql = new StringBuilder();
using (var temp = TempIndex.Borrow())
{
var index = temp.Item;
FillJoinSql(chainRoot, chainRoot, exp, sql, index);
}
return(sql.ToString());
}
/// <summary>
/// 获取表<paramref name="chainRoot"/>需要查询的select字段
/// </summary>
/// <param name="chainRoot"></param>
/// <param name="exp"></param>
/// <param name="chain">可以为输出的字段前置对象链</param>
/// <returns></returns>
private static string GetSelectFieldsSql(DataTable chainRoot, SqlDefinition exp)
{
StringBuilder sql = new StringBuilder();
sql.Append(GetChainRootSelectFieldsSql(chainRoot, exp).Trim());
using (var temp = TempIndex.Borrow())
{
var index = temp.Item;
sql.Append(GetSlaveSelectFieldsSql(chainRoot, chainRoot, exp, index).Trim());
}
sql.Length--;//移除最后一个逗号
return(sql.ToString());
}