Question

我是SQL Server中XML查询的新手。我想写一个

的查询

在子节点中查找值并删除其父节点
在子节点中重新订购商品订单

如下面的示例所示：我的列类型为nvarchar(max)并存储值：

<Trainings>
    <Training>
        <Id>10</Id>
        <Data>test1</Data>
        <ItemOrder>1</ItemOrder>
    </Training> 
    <Training>
        <Id>12</Id>
        <Data>test12</Data>
        <ItemOrder>2</ItemOrder>
    </Training>
    <Training>
        <Id>101</Id>
        <Data>test111</Data>
        <ItemOrder>3</ItemOrder>
    </Training> 
    <Training>
        <Id>102</Id>
        <Data>test122</Data>
        <ItemOrder>4</ItemOrder>
    </Training> 
</Trainings>

预期结果必须是：

<Trainings>
    <Training>
        <Id>10</Id>
        <Data>test1</Data>
        <ItemOrder>1</ItemOrder>
    </Training> 
    <Training>
        <Id>101</Id>
        <Data>test111</Data>
        <ItemOrder>2</ItemOrder>
    </Training> 
    <Training>
        <Id>102</Id>
        <Data>test122</Data>
        <ItemOrder>3</ItemOrder>
    </Training> 
</Trainings>

我已尝试使用如下查询，但如何在Training孩子中找到test12 Data节点号？然后为所有ItemOrder个节点重新排序所有Training。

CREATE TABLE Resume ([Training] nvarchar(max));

INSERT INTO Resume ([Training])
VALUES ('<Trainings><Training><Id>10</Id><Data>test1</Data><ItemOrder>1</ItemOrder></Training><Training><Id>12</Id><Data>test12</Data><ItemOrder>2</ItemOrder></Training><Training><Id>101</Id><Data>test111</Data><ItemOrder>3</ItemOrder></Training><Training><Id>102</Id><Data>test122</Data><ItemOrder>4</ItemOrder></Training></Trainings>');

DECLARE @string NVARCHAR(MAX)

SELECT @string = [Training] 
FROM Resume

DECLARE @xml XML

SET @xml = CONVERT(XML, @string)
SET @xml.modify('delete (/Trainings/Training)[2]')
SET @string = CONVERT(NVARCHAR(MAX), @xml)

SELECT @string

以下是小提琴链接：http://sqlfiddle.com/#!6/894a0/3

Answer 1

将XPath与您搜索的谓词一起使用

 public class EntityEnterPatientDiagnosisDetails
   {
        public int PatientId { get; set; }
        public string Symptoms { get; set; }
        public string DiagnosisProvided { get; set;}
        public string AdministeredBy { get; set; }
        public DateTime DateofDiagnosis { get; set; }
        public string FollowUpRequired { get; set; }
        public DateTime FollowUpDate { get; set; }



        /// <summary>
        /// Bill Part
        /// </summary>
        public int BillAmount { get; set; }
        public string ModeOfPayment { get; set; }
        public string CardNumber { get; set; }

    }

更新：为了解决第二个问题，我建议使用完全不同的XML关系方法：

set @xml.modify('delete (/Trainings/Training[./Data = "test12"])')

demo

如何通过SQL Server的子节点中的值查找所有父节点

1 个答案: