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Generated SQL optimization

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sunkaixuan
2022-05-09 21:33:58 +08:00
parent b7e5ec6c39
commit 8f7f5c7fdd
1 changed files with 25 additions and 5 deletions
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30
Src/Asp.Net/SqlSugar/Realization/SqlServer/SqlBuilder/SqlServerQueryBuilder.cs
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@@ -52,21 +52,25 @@ namespace SqlSugar
var isIgnoreOrderBy = this.IsCount && this.PartitionByValue.IsNullOrEmpty(); var isIgnoreOrderBy = this.IsCount && this.PartitionByValue.IsNullOrEmpty();
AppendFilter(); AppendFilter();
sql = new StringBuilder(); sql = new StringBuilder();
var oldOrderByValue = this.OrderByValue;
if (this.OrderByValue == null && (Skip != null || Take != null)) this.OrderByValue = " ORDER BY GetDate() "; if (this.OrderByValue == null && (Skip != null || Take != null)) this.OrderByValue = " ORDER BY GetDate() ";
if (this.PartitionByValue.HasValue()) if (this.PartitionByValue.HasValue())
{ {
this.OrderByValue = this.PartitionByValue + this.OrderByValue; this.OrderByValue = this.PartitionByValue + this.OrderByValue;
} }
var isFirst = (Skip == 0 || Skip == null) && Take == 1 && DisableTop == false; var isFirst = (Skip == 0 || Skip == null) && Take == 1 && DisableTop == false;
var isRowNumber = (Skip != null || Take != null) && !isFirst; var isTop = (Skip == null && Take != null && DisableTop == false);
var isRowNumber = (Skip != null || Take != null) && !isFirst && !isTop;
if (!isRowNumber && oldOrderByValue == null) { this.OrderByValue = null; }
if (isFirst && oldOrderByValue == "ORDER BY GETDATE() ") { this.OrderByValue = null; }
var rowNumberString = string.Format(",ROW_NUMBER() OVER({0}) AS RowIndex ", GetOrderByString); var rowNumberString = string.Format(",ROW_NUMBER() OVER({0}) AS RowIndex ", GetOrderByString);
string groupByValue = GetGroupByString + HavingInfos; string groupByValue = GetGroupByString + HavingInfos;
string orderByValue = (!isRowNumber && this.OrderByValue.HasValue()) ? GetOrderByString : null; string orderByValue = (!isRowNumber && this.OrderByValue.HasValue()) ? GetOrderByString : null;
if (isIgnoreOrderBy) { orderByValue = null; } if (isIgnoreOrderBy) { orderByValue = null; }
sql.AppendFormat(SqlTemplate, isFirst ? (" TOP 1 " + GetSelectValue) : GetSelectValue, GetTableNameString, GetWhereValueString, groupByValue, orderByValue); sql.AppendFormat(SqlTemplate, GetSelect(isFirst,isTop), base.GetTableNameString, base.GetWhereValueString, groupByValue, orderByValue);
sql.Replace(UtilConstants.ReplaceKey, isRowNumber ? (isIgnoreOrderBy ? null : rowNumberString) : null); sql.Replace(UtilConstants.ReplaceKey, isRowNumber ? (isIgnoreOrderBy ? null : rowNumberString) : null);
if (isIgnoreOrderBy) { this.OrderByValue = oldOrderBy; return sql.ToString(); } if (isIgnoreOrderBy) { this.OrderByValue = oldOrderBy; return sql.ToString(); }
var result = isFirst ? sql.ToString() : ToPageSql(sql.ToString(), this.Take, this.Skip); var result = (isFirst || isTop) ? sql.ToString() : ToPageSql(sql.ToString(), this.Take, this.Skip);
if (ExternalPageIndex > 0) if (ExternalPageIndex > 0)
{ {
if (externalOrderBy.IsNullOrEmpty()) if (externalOrderBy.IsNullOrEmpty())
@@ -85,10 +89,10 @@ namespace SqlSugar
if (this.OldSql.HasValue()) if (this.OldSql.HasValue())
this.OldSql += " ORDER BY GETDATE() "; this.OldSql += " ORDER BY GETDATE() ";
} }
else else
{ {
if (this.OldSql.HasValue()) if (this.OldSql.HasValue())
this.OldSql += (" "+this.GetOrderByString); this.OldSql += (" " + this.GetOrderByString);
} }
result += this.Offset; result += this.Offset;
@@ -98,5 +102,21 @@ namespace SqlSugar
result = GetSqlQuerySql(result); result = GetSqlQuerySql(result);
return result; return result;
} }
private string GetSelect(bool isFirst,bool isTop)
{
if (isFirst)
{
return (" TOP 1 " + GetSelectValue);
}
else if(isTop)
{
return ($" TOP {this.Take} " + GetSelectValue);
}
else
{
return GetSelectValue;
}
}
} }
} }