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- 增加 Clickhouse Sample 采样子句；

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This commit is contained in:
2881099
2022-09-18 21:12:11 +08:00
parent 9b264aa163
commit b0b7cb204c
2 changed files with 40 additions and 18 deletions
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21
Providers/FreeSql.Provider.ClickHouse/ClickHouseExtensions.cs
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@ -16,6 +16,9 @@ public static partial class FreeSqlClickHouseGlobalExtensions
public static string FormatClickHouse(this string that, params object[] args) => _clickHouseAdo.Addslashes(that, args);
static FreeSql.ClickHouse.ClickHouseAdo _clickHouseAdo = new FreeSql.ClickHouse.ClickHouseAdo();
/// <summary>
/// Clickhouse limit by
/// </summary>
public static ISelect<T> LimitBy<T>(this ISelect<T> that, Expression<Func<T, object>> selector, int limit, int offset = 0)
{
if (limit <= 0 && offset <= 0) return that;
@ -25,7 +28,7 @@ public static partial class FreeSqlClickHouseGlobalExtensions
try
{
s0p.InternalOrderBy(selector);
s0p._limitBy = $"limit {(offset > 0 ? $"{offset}, " : "")}{limit} by {s0p._orderby}";
s0p._limitBy = $"LIMIT {(offset > 0 ? $"{offset}, " : "")}{limit} BY {s0p._orderby}";
}
finally
{
@ -33,4 +36,20 @@ public static partial class FreeSqlClickHouseGlobalExtensions
}
return that;
}
/// <summary>
/// Clickhouse 采样子句
/// </summary>
public static ISelect<T> Sample<T>(this ISelect<T> that, decimal k, int n, decimal m)
{
var s0p = that as ClickHouseSelect<T>;
if (k > 0)
if (m > 0)
s0p._sample = $"SAMPLE {k} OFFSET {m}";
else
s0p._sample = $"SAMPLE {k}";
else if (n > 0)
s0p._sample = $"SAMPLE {k}";
return that;
}
}