mirror of https://github.com/Sonarr/Sonarr
127 lines
3.7 KiB
C#
127 lines
3.7 KiB
C#
![]() |
using System;
|
|||
|
using System.Collections.Generic;
|
|||
|
using System.Linq;
|
|||
|
using System.Text;
|
|||
|
|
|||
|
namespace Marr.Data.QGen
|
|||
|
{
|
|||
|
public class RowCountQueryDecorator : IQuery
|
|||
|
{
|
|||
|
private SelectQuery _innerQuery;
|
|||
|
|
|||
|
public RowCountQueryDecorator(SelectQuery innerQuery)
|
|||
|
{
|
|||
|
_innerQuery = innerQuery;
|
|||
|
}
|
|||
|
|
|||
|
public string Generate()
|
|||
|
{
|
|||
|
// Decide which type of paging query to create
|
|||
|
if (_innerQuery.IsView || _innerQuery.IsJoin)
|
|||
|
{
|
|||
|
return ComplexRowCount();
|
|||
|
}
|
|||
|
else
|
|||
|
{
|
|||
|
return SimpleRowCount();
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
/// <summary>
|
|||
|
/// Generates a row count query for a multiple table joined query (groups by the parent entity).
|
|||
|
/// </summary>
|
|||
|
/// <returns></returns>
|
|||
|
private string ComplexRowCount()
|
|||
|
{
|
|||
|
// Create paged query
|
|||
|
StringBuilder sql = new StringBuilder();
|
|||
|
|
|||
|
sql.AppendLine("WITH GroupCTE AS (");
|
|||
|
sql.Append("SELECT ").AppendLine(BuildBaseTablePKColumns());
|
|||
|
BuildGroupColumn(sql);
|
|||
|
_innerQuery.BuildFromClause(sql);
|
|||
|
_innerQuery.BuildJoinClauses(sql);
|
|||
|
_innerQuery.BuildWhereClause(sql);
|
|||
|
sql.AppendLine(")");
|
|||
|
BuildSelectCountClause(sql);
|
|||
|
sql.AppendLine("FROM GroupCTE");
|
|||
|
sql.AppendLine("WHERE GroupRow = 1");
|
|||
|
|
|||
|
return sql.ToString();
|
|||
|
}
|
|||
|
|
|||
|
/// <summary>
|
|||
|
/// Generates a row count query for a single table query (no joins).
|
|||
|
/// </summary>
|
|||
|
/// <returns></returns>
|
|||
|
private string SimpleRowCount()
|
|||
|
{
|
|||
|
StringBuilder sql = new StringBuilder();
|
|||
|
|
|||
|
BuildSelectCountClause(sql);
|
|||
|
_innerQuery.BuildFromClause(sql);
|
|||
|
_innerQuery.BuildJoinClauses(sql);
|
|||
|
_innerQuery.BuildWhereClause(sql);
|
|||
|
|
|||
|
return sql.ToString();
|
|||
|
}
|
|||
|
|
|||
|
private void BuildGroupColumn(StringBuilder sql)
|
|||
|
{
|
|||
|
string baseTablePKColumns = BuildBaseTablePKColumns();
|
|||
|
sql.AppendFormat(", ROW_NUMBER() OVER (PARTITION BY {0} ORDER BY {1}) As GroupRow ", baseTablePKColumns, baseTablePKColumns);
|
|||
|
}
|
|||
|
|
|||
|
private string BuildBaseTablePKColumns()
|
|||
|
{
|
|||
|
Table baseTable = GetBaseTable();
|
|||
|
|
|||
|
StringBuilder sb = new StringBuilder();
|
|||
|
foreach (var col in baseTable.Columns.PrimaryKeys)
|
|||
|
{
|
|||
|
if (sb.Length > 0)
|
|||
|
sb.AppendLine(", ");
|
|||
|
|
|||
|
string colName = _innerQuery.IsView ?
|
|||
|
_innerQuery.NameOrAltName(col.ColumnInfo) :
|
|||
|
col.ColumnInfo.Name;
|
|||
|
|
|||
|
sb.AppendFormat(_innerQuery.Dialect.CreateToken(string.Concat(baseTable.Alias, ".", colName)));
|
|||
|
}
|
|||
|
|
|||
|
return sb.ToString();
|
|||
|
}
|
|||
|
|
|||
|
private void BuildSelectCountClause(StringBuilder sql)
|
|||
|
{
|
|||
|
sql.AppendLine("SELECT COUNT(*)");
|
|||
|
}
|
|||
|
|
|||
|
private Table GetBaseTable()
|
|||
|
{
|
|||
|
Table baseTable = null;
|
|||
|
if (_innerQuery.Tables[0] is View)
|
|||
|
{
|
|||
|
baseTable = (_innerQuery.Tables[0] as View).Tables[0];
|
|||
|
}
|
|||
|
else
|
|||
|
{
|
|||
|
baseTable = _innerQuery.Tables[0];
|
|||
|
}
|
|||
|
return baseTable;
|
|||
|
}
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
/*
|
|||
|
WITH GroupCTE AS
|
|||
|
(
|
|||
|
SELECT [t0].[ID],[t0].[OrderName],[t1].[ID] AS OrderItemID,[t1].[OrderID],[t1].[ItemDescription],[t1].[Price],
|
|||
|
ROW_NUMBER() OVER (PARTITION BY [t0].[ID] ORDER BY [t0].[OrderName]) As GroupRow
|
|||
|
FROM [Order] [t0]
|
|||
|
LEFT JOIN [OrderItem] [t1] ON (([t0].[ID] = [t1].[OrderID]))
|
|||
|
--WHERE (([t0].[OrderName] = @P0))
|
|||
|
)
|
|||
|
SELECT * FROM GroupCTE
|
|||
|
WHERE GroupRow = 1
|
|||
|
*/
|