fix addition of fractional second duration on SQL Server
Signed-off-by: Gavin King <gavin@hibernate.org>
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@ -788,10 +788,15 @@ public class SQLServerDialect extends AbstractTransactSQLDialect {
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return 6; //microseconds!
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}
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/**
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* Even though SQL Server only supports 1/10th microsecond precision,
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* we use nanosecond as the "native" precision for datetime arithmetic
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* since it simplifies calculations.
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*/
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@Override
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public long getFractionalSecondPrecisionInNanos() {
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// return 100; // 1/10th microsecond
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return 1; // Even though SQL Server only supports 1/10th microsecond precision, use nanosecond scale for easier computation
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return 1;
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}
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@Override
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@ -823,12 +828,14 @@ public class SQLServerDialect extends AbstractTransactSQLDialect {
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// there's no dateadd_big()) so here we need to use two
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// calls to dateadd() to add a whole duration
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switch (unit) {
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case NANOSECOND:
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case NANOSECOND: //use nanosecond as the "native" precision
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case NATIVE:
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return "dateadd(nanosecond,?2%1000000000,dateadd(second,?2/1000000000,?3))";
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// case NATIVE:
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// // 1/10th microsecond is the "native" precision
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// // we could in principle use 1/10th microsecond as the "native" precision
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// return "dateadd(nanosecond,?2%10000000,dateadd(second,?2/10000000,?3))";
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case SECOND:
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return "dateadd(nanosecond,cast(?2*1e9 as bigint)%1000000000,dateadd(second,?2,?3))";
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default:
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return "dateadd(?1,?2,?3)";
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}
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