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- 优化 通用 Odbc 支持 Limit 风格的分页；#469

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This commit is contained in:
28810 2020-09-28 04:33:55 +08:00
parent 070b9a1e66
commit e22c2617c4
1 changed files with 5 additions and 16 deletions
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21
Providers/FreeSql.Provider.Odbc/Default/Curd/OdbcSelect.cs
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@ -34,18 +34,9 @@ namespace FreeSql.Odbc.Default
if (_distinct) sb.Append("DISTINCT ");
if (_limit > 0 && _utils.Adapter.SelectTopStyle == OdbcAdapter.SelecTopStyle.Top) sb.Append("TOP ").Append(_skip + _limit).Append(" ");
sb.Append(field);
if (_skip > 0)
{
if (string.IsNullOrEmpty(_orderby))
{
var pktb = _tables.Where(a => a.Table.Primarys.Any()).FirstOrDefault();
if (pktb != null) _orderby = string.Concat(" \r\nORDER BY ", pktb.Alias, ".", _commonUtils.QuoteSqlName(pktb?.Table.Primarys.First().Attribute.Name));
else _orderby = string.Concat(" \r\nORDER BY ", _tables.First().Alias, ".", _commonUtils.QuoteSqlName(_tables.First().Table.Columns.First().Value.Attribute.Name));
}
sb.Append(", ROW_NUMBER() OVER(").Append(_orderby).Append(") AS __rownum__");
if (_skip > 0 && _utils.Adapter.SelectTopStyle == OdbcAdapter.SelecTopStyle.Top)
throw new NotImplementedException("FreeSql.Odbc.Default 未实现 Skip/Offset 功能，如果需要分页请使用判断上一次 id");
}
sb.Append(" \r\nFROM ");
var tbsjoin = _tables.Where(a => a.Type != SelectTableInfoType.From).ToArray();
var tbsfrom = _tables.Where(a => a.Type == SelectTableInfoType.From).ToArray();
@ -116,13 +107,11 @@ namespace FreeSql.Odbc.Default
if (string.IsNullOrEmpty(_having) == false)
sb.Append(" \r\nHAVING ").Append(_having.Substring(5));
}
if (_skip <= 0)
sb.Append(_orderby);
else
sb.Insert(0, "WITH t AS ( ").Append(" ) SELECT t.* FROM t where __rownum__ > ").Append(_skip);
sb.Append(_orderby);
if (_limit > 0 && _utils.Adapter.SelectTopStyle == OdbcAdapter.SelecTopStyle.Limit) sb.Append(" \r\nLIMIT ").Append(_limit);
if (_skip > 0 && _utils.Adapter.SelectTopStyle == OdbcAdapter.SelecTopStyle.Limit) sb.Append(" \r\nOFFSET ").Append(_skip);
sbnav.Clear();
if (_limit > 0 && _utils.Adapter.SelectTopStyle == OdbcAdapter.SelecTopStyle.Limit) sb.Append(" \r\nLIMIT ").Append(_skip + _limit);
if (tbUnionsGt0) sb.Append(") ftb");
}
return sb.Append(_tosqlAppendContent).ToString();