从QueryPlan xml中提取ColumnReference信息

时间：2018-10-16 10:50:04

标签： sql xml tsql

我有一个很大的xml，不过它只是一个查询计划。我需要从中提取列信息。

在该xml中，有一个类似下面的标签，

<ColumnReference Table="[TestTable]" Schema="[dbo]" Database="[Mydatabase]" Column="FirstName" Alias="a"/>

我想提取表格，模式，列信息。 ColumnReference埋在多个不同的标签内。但是无论层次结构如何，我都需要所有ColumnReference标签

从Columnreference中选择表，模式，列

xml的一部分，例如：

<RelOp EstimatedExecutionMode="Row" EstimateRewinds="0" EstimateRebinds="0" Parallel="1" EstimatedTotalSubtreeCost="92.6757" AvgRowSize="349" EstimateCPU="0.0439447" EstimateIO="0" EstimateRows="179.753" LogicalOp="Repartition Streams" PhysicalOp="Parallelism" NodeId="3">
<OutputList>
<ColumnReference Table="[REALESTATECONTRACT2]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="ODS_REGIONCODE" Alias="[REC2]"/>
<ColumnReference Table="[REALESTATECONTRACT2]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="PRIMARYLOCATIONTRIIDTX" Alias="[REC2]"/>
<ColumnReference Table="[SPACE]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="PATHTX" Alias="[SP]"/>
<ColumnReference Table="[SPACE]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="PARENTIDSY" Alias="[SP]"/>
<ColumnReference Table="[SPACE]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="PARENTFLOORTX" Alias="[SP]"/>
<ColumnReference Table="[SPACE]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="PARENTBUILDINGTX" Alias="[SP]"/>
<ColumnReference Table="[SPACE]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="NAMETX" Alias="[SP]"/>
<ColumnReference Table="[BUILDING1]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="STATEPROVTX" Alias="[BLD]"/>
<ColumnReference Table="[BUILDING2]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="COUNTRYTX" Alias="[BLD2]"/>
<ColumnReference Table="[BUILDING2]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="CITYTX" Alias="[BLD2]"/>
<ColumnReference Table="[BUILDING2]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="ACTIVESTARTDA" Alias="[BLD2]"/>
</OutputList>
<Parallelism PartitioningType="Hash">
<PartitionColumns>
<ColumnReference Table="[REALESTATECONTRACT2]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="PRIMARYLOCATIONTRIIDTX" Alias="[REC2]"/>
<ColumnReference Table="[SPACE]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="NAMETX" Alias="[SP]"/>
<ColumnReference Table="[SPACE]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="PATHTX" Alias="[SP]"/>
<ColumnReference Table="[SPACE]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="PARENTIDSY" Alias="[SP]"/>
<ColumnReference Table="[SPACE]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="PARENTFLOORTX" Alias="[SP]"/>
<ColumnReference Table="[SPACE]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="PARENTBUILDINGTX" Alias="[SP]"/>
<ColumnReference Table="[BUILDING2]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="CITYTX" Alias="[BLD2]"/>
<ColumnReference Table="[BUILDING1]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="STATEPROVTX" Alias="[BLD]"/>
<ColumnReference Table="[BUILDING2]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="COUNTRYTX" Alias="[BLD2]"/>
<ColumnReference Table="[BUILDING2]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="ACTIVESTARTDA" Alias="[BLD2]"/>
</PartitionColumns>

1 个答案:

答案 0 :(得分：0)

可能会帮助您：

DECLARE @xml XML=
N'<RelOp EstimatedExecutionMode="Row" EstimateRewinds="0" EstimateRebinds="0" Parallel="1" EstimatedTotalSubtreeCost="92.6757" AvgRowSize="349" EstimateCPU="0.0439447" EstimateIO="0" EstimateRows="179.753" LogicalOp="Repartition Streams" PhysicalOp="Parallelism" NodeId="3">
<OutputList>
<ColumnReference Table="[REALESTATECONTRACT2]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="ODS_REGIONCODE" Alias="[REC2]"/>
<ColumnReference Table="[REALESTATECONTRACT2]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="PRIMARYLOCATIONTRIIDTX" Alias="[REC2]"/>
<ColumnReference Table="[SPACE]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="PATHTX" Alias="[SP]"/>
<ColumnReference Table="[SPACE]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="PARENTIDSY" Alias="[SP]"/>
<ColumnReference Table="[SPACE]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="PARENTFLOORTX" Alias="[SP]"/>
<ColumnReference Table="[SPACE]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="PARENTBUILDINGTX" Alias="[SP]"/>
<ColumnReference Table="[SPACE]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="NAMETX" Alias="[SP]"/>
<ColumnReference Table="[BUILDING1]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="STATEPROVTX" Alias="[BLD]"/>
<ColumnReference Table="[BUILDING2]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="COUNTRYTX" Alias="[BLD2]"/>
<ColumnReference Table="[BUILDING2]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="CITYTX" Alias="[BLD2]"/>
<ColumnReference Table="[BUILDING2]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="ACTIVESTARTDA" Alias="[BLD2]"/>
</OutputList>
<Parallelism PartitioningType="Hash">
<PartitionColumns>
<ColumnReference Table="[REALESTATECONTRACT2]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="PRIMARYLOCATIONTRIIDTX" Alias="[REC2]"/>
<ColumnReference Table="[SPACE]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="NAMETX" Alias="[SP]"/>
<ColumnReference Table="[SPACE]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="PATHTX" Alias="[SP]"/>
<ColumnReference Table="[SPACE]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="PARENTIDSY" Alias="[SP]"/>
<ColumnReference Table="[SPACE]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="PARENTFLOORTX" Alias="[SP]"/>
<ColumnReference Table="[SPACE]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="PARENTBUILDINGTX" Alias="[SP]"/>
<ColumnReference Table="[BUILDING2]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="CITYTX" Alias="[BLD2]"/>
<ColumnReference Table="[BUILDING1]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="STATEPROVTX" Alias="[BLD]"/>
<ColumnReference Table="[BUILDING2]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="COUNTRYTX" Alias="[BLD2]"/>
<ColumnReference Table="[BUILDING2]" Schema="[Tririga]" Database="[TRI_INTL_CERT]" Column="ACTIVESTARTDA" Alias="[BLD2]"/>
</PartitionColumns>
</Parallelism>
</RelOp>';

-我使用两个变量，您可以根据需要进行调整

DECLARE @tableName VARCHAR(100)='[BUILDING2]';
DECLARE @ColumnName VARCHAR(100)='COUNTRYTX'

-这将使用Xpath / XQuery来触发//的深度搜索（<ColumnReference>），但是它将仅返回行，谓词为满足。

SELECT a.query('.')
FROM @xml.nodes(N'//ColumnReference[@Table=sql:variable("@tableName") 
                                    and @Column=sql:variable("@ColumnName")]') A(a);

更新

此查询将返回列中的行：

DECLARE @tableName VARCHAR(100)='[BUILDING2]';
DECLARE @ColumnName VARCHAR(100)='COUNTRYTX'

SELECT a.value('@Table','nvarchar(max)') AS TableName
      ,a.value('@Schema','nvarchar(max)') AS SchemaName
      ,a.value('@Database','nvarchar(max)') AS DatabaseName
      ,a.value('@Column','nvarchar(max)') AS ColumnName
      ,a.value('@Alias','nvarchar(max)') AS Alias
FROM @xml.nodes(N'//ColumnReference[@Table=sql:variable("@tableName") 
                                    and @Column=sql:variable("@ColumnName")]') A(a)
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