[英]Problems with NHibernate and DateTime mappings
我在查询中遇到问题,我在给定的时间跨度内选择记录。
我选择的列是DATE类型。 我已将此列映射为DateTime属性,并且查询有效,但速度很慢。
生成的查询如下所示:(由NHProfiler提供)
select kifkalende0_.KALENDER_MEDARBEJDER_ID as KALENDER1_119_0_,
kifkalende1_.KALENDER_EMNE_ID as KALENDER1_210_1_,
kifkalende0_.OPDATERET_TIDSPUNKT as OPDATERET2_119_0_,
kifkalende0_.AENDRET as AENDRET119_0_,
kifkalende0_.OPDATERET_AF as OPDATERET4_119_0_,
kifkalende0_.OPRETTET_AF as OPRETTET5_119_0_,
kifkalende0_.OPRETTET_TIDSPUNKT as OPRETTET6_119_0_,
kifkalende0_.SLETTET as SLETTET119_0_,
kifkalende0_.KALENDER_EMNE_ID as KALENDER8_119_0_,
kifkalende0_.MEDARBEJDER_ID as MEDARBEJ9_119_0_,
kifkalende1_.OPDATERET_TIDSPUNKT as OPDATERET2_210_1_,
kifkalende1_.BESKRIVELSE as BESKRIVE3_210_1_,
kifkalende1_.DATO as DATO210_1_,
kifkalende1_.ER_FRA_SAG as ER5_210_1_,
kifkalende1_.FRA_SAG_ID as FRA6_210_1_,
kifkalende1_.FRA_TABEL as FRA7_210_1_,
kifkalende1_.FRA_TID as FRA8_210_1_,
kifkalende1_.OPDATERET_AF as OPDATERET9_210_1_,
kifkalende1_.OPRETTET_AF as OPRETTET10_210_1_,
kifkalende1_.OPRETTET_TIDSPUNKT as OPRETTET11_210_1_,
kifkalende1_.SAG_TYPE as SAG12_210_1_,
kifkalende1_.TIL_TID as TIL13_210_1_,
kifkalende1_.YDERLIGERE_BESKRIVELSE as YDERLIGERE14_210_1_,
kifkalende1_.EMNE_ID as EMNE15_210_1_,
kifkalende1_.PERSON_ID as PERSON16_210_1_
from "KIF_KALENDER_MEDARBEJDER" kifkalende0_
left outer join "KIF_KALENDER_EMNE" kifkalende1_ on
kifkalende0_.KALENDER_EMNE_ID = kifkalende1_.KALENDER_EMNE_ID,
"KIF_KALENDER_EMNE" kifkalende2_
where kifkalende0_.KALENDER_EMNE_ID = kifkalende2_.KALENDER_EMNE_ID
and (kifkalende0_.MEDARBEJDER_ID in (7624 /* :p3 */,6226
/* :p4 */,7382 /* :p5 */,5774 /* :p6 */, 5775 /* :p7 */,8259
/* :p8 */,8218 /* :p9 */,9899 /* :p10 */, 6000 /* :p11 */,5779
/* :p12 */,5780 /* :p13 */,5782 /* :p14 */, 5783 /* :p15 */,5784
/* :p16 */,5785 /* :p17 */,5788 /* :p18 */, 5789 /* :p19 */,5790
/* :p20 */,7341 /* :p21 */,8963 /* :p22 */, 10201 /* :p23 */,10388
/* :p24 */))
and kifkalende2_.DATO >= TIMESTAMP '2010-11-10 00:00:00.00' /* :p0 */
and kifkalende2_.DATO <= TIMESTAMP '2010-11-10 23:59:59.00' /* :p1 */
and (kifkalende0_.SLETTET = TIMESTAMP '1899-12-31 00:00:00.00' /* :p2 */
or kifkalende0_.SLETTET is null);
在我们的数据库中,执行大约需要1500毫秒。
如果我们手动将查询更改为:
select kifkalende0_.KALENDER_MEDARBEJDER_ID as KALENDER1_119_0_,
kifkalende1_.KALENDER_EMNE_ID as KALENDER1_210_1_,
kifkalende0_.OPDATERET_TIDSPUNKT as OPDATERET2_119_0_,
kifkalende0_.AENDRET as AENDRET119_0_,
kifkalende0_.OPDATERET_AF as OPDATERET4_119_0_,
kifkalende0_.OPRETTET_AF as OPRETTET5_119_0_,
kifkalende0_.OPRETTET_TIDSPUNKT as OPRETTET6_119_0_,
kifkalende0_.SLETTET as SLETTET119_0_,
kifkalende0_.KALENDER_EMNE_ID as KALENDER8_119_0_,
kifkalende0_.MEDARBEJDER_ID as MEDARBEJ9_119_0_,
kifkalende1_.OPDATERET_TIDSPUNKT as OPDATERET2_210_1_,
kifkalende1_.BESKRIVELSE as BESKRIVE3_210_1_,
kifkalende1_.DATO as DATO210_1_,
kifkalende1_.ER_FRA_SAG as ER5_210_1_,
kifkalende1_.FRA_SAG_ID as FRA6_210_1_,
kifkalende1_.FRA_TABEL as FRA7_210_1_,
kifkalende1_.FRA_TID as FRA8_210_1_,
kifkalende1_.OPDATERET_AF as OPDATERET9_210_1_,
kifkalende1_.OPRETTET_AF as OPRETTET10_210_1_,
kifkalende1_.OPRETTET_TIDSPUNKT as OPRETTET11_210_1_,
kifkalende1_.SAG_TYPE as SAG12_210_1_,
kifkalende1_.TIL_TID as TIL13_210_1_,
kifkalende1_.YDERLIGERE_BESKRIVELSE as YDERLIGERE14_210_1_,
kifkalende1_.EMNE_ID as EMNE15_210_1_,
kifkalende1_.PERSON_ID as PERSON16_210_1_
from "KIF_KALENDER_MEDARBEJDER" kifkalende0_
left outer join "KIF_KALENDER_EMNE" kifkalende1_ on
kifkalende0_.KALENDER_EMNE_ID = kifkalende1_.KALENDER_EMNE_ID,
"KIF_KALENDER_EMNE" kifkalende2_
where kifkalende0_.KALENDER_EMNE_ID = kifkalende2_.KALENDER_EMNE_ID
and (kifkalende0_.MEDARBEJDER_ID in (7624 /* :p3 */,6226
/* :p4 */,7382 /* :p5 */,5774 /* :p6 */, 5775 /* :p7 */,8259
/* :p8 */,8218 /* :p9 */,9899 /* :p10 */, 6000 /* :p11 */,5779
/* :p12 */,5780 /* :p13 */,5782 /* :p14 */, 5783 /* :p15 */,5784
/* :p16 */,5785 /* :p17 */,5788 /* :p18 */, 5789 /* :p19 */,5790
/* :p20 */,7341 /* :p21 */,8963 /* :p22 */, 10201 /* :p23 */,10388
/* :p24 */))
and kifkalende2_.DATO>=to_date('10-11-2010 00:00:00', 'DD-MM-YYYY HH24:MI:SS')
and kifkalende2_.DATO<=to_date('10-11-2010 23:59:59', 'DD-MM-YYYY HH24:MI:SS')
and (kifkalende0_.SLETTET=to_date('31-12-1899 00:00:00', 'DD-MM-YYYY HH24:MI:SS')
or kifkalende0_.SLETTET is null);
它在大约50ms内执行。
有没有办法让NHibernate生成to_date而不是时间戳进行日期比较?
关于RegisterDateTimeTypeMappings如何在Oracle10gDialect中工作,我有点困惑,但我尝试扩展它,将方法更改为
protected override void RegisterDateTimeTypeMappings()
{
RegisterColumnType(DbType.Date, "DATE");
//RegisterColumnType(DbType.DateTime, "TIMESTAMP(4)");
RegisterColumnType(DbType.DateTime, "DATE");
RegisterColumnType(DbType.Time, "TIMESTAMP(4)");
}
但这没有帮助。
我们的环境是:
有人有什么建议吗?
谢谢,。/丹尼尔
我通过覆盖以下NHibernate类来解决我的问题和你的问题。 NHProfiler仍将显示TIMESTAMP值,但基础参数将为DATE类型 - 如果您的oracle列也是DateTime,则该参数将是可索引的。 将鼠标悬停在NHProfiler中的参数上以查看我的意思 - 例如:: p0:TIMESTAMP - '2011-07-01 00:00:00.00'日期而不是:p0:TIMESTAMP - '2011-07-01 00: 00:00.00'时间戳。
我也使用Oracle 11g,C#.Net 4,Nhibernate 3.2。
public class OracleDataClientDriver2 : OracleDataClientDriver
{
protected override void InitializeParameter(IDbDataParameter dbParam, string name, SqlType sqlType)
{
switch (sqlType.DbType)
{
//Timestamp columns not indexed by Oracle 11g date columns. - Use Date
case DbType.DateTime:
base.InitializeParameter(dbParam, name, SqlTypeFactory.Date);
break;
default:
base.InitializeParameter(dbParam, name, sqlType);
break;
}
}
}
如果参数的类型正确,则根本不应进行任何转换。 只有在字符串类型中包含时间戳时才需要TIMESTAMP或to_date()。 如果参数输入正确,则应如下所示:
select
tab.COL as col
from
TABLE tab
where
tab.COL = :p0;
:p0 = 01.01.2000 00:00:00 [Type: DateTime (0)]
因此,请确保将DateTime
对象传递给查询。
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