Question

这是我的XML：

<?xml version="1.0" encoding="UTF-8"?>
<Data>
   <Record>
      <ServerId>1</ServerId>
      <CompanyId>1</CompanyId>
      <InstanceId>2</InstanceId>
      <TemplateId>23</TemplateId>
      <ContactId>11052</ContactId>
      <RecordId>11462</RecordId>
      <TaskId>677</TaskId>
      <EntryDate>2016-04-21 14:17:02:813</EntryDate>
      <EntryKey>key_test_1</EntryKey>
      <EntryValue>value_test_1</EntryValue>
   </Record>
   <Record>
      <ServerId>1</ServerId>
      <CompanyId>1</CompanyId>
      <InstanceId>2</InstanceId>
      <TemplateId>23</TemplateId>
      <ContactId>11052</ContactId>
      <RecordId>11462</RecordId>
      <TaskId>677</TaskId>
      <EntryDate>2016-04-21 14:17:02:873</EntryDate>
      <EntryKey>key_test_2</EntryKey>
      <EntryValue>value_test_2</EntryValue>
   </Record>
   <Record>
      <ServerId>1</ServerId>
      <CompanyId>1</CompanyId>
      <InstanceId>2</InstanceId>
      <TemplateId>23</TemplateId>
      <ContactId>11052</ContactId>
      <RecordId>11462</RecordId>
      <TaskId>677</TaskId>
      <EntryDate>2016-04-21 14:17:02:935</EntryDate>
      <EntryKey>key_test_1</EntryKey>
      <EntryValue>value_test_3</EntryValue>
   </Record>
</Data>

这是MERGE语句，用于将此数据插入或更新到单个表中：

merge WRF_REPOSITORY_CUSTOM_DATA rep
using (select 
        entity.value('ServerId[1]', 'int') as ServerId,
        entity.value('CompanyId[1]', 'int') as CompanyId,
        entity.value('InstanceId[1]', 'int') as InstanceId,
        entity.value('TemplateId[1]', 'int') as TemplateId,
        entity.value('ContactId[1]', 'bigint') as ContactId,
        entity.value('RecordId[1]', 'bigint') as RecordId,
        entity.value('TaskId[1]', 'bigint') as TaskId,
        entity.value('EntryDate[1]', 'datetime') as EntryDate,
        entity.value('EntryKey[1]', 'varchar(max)') as EntryKey,
        entity.value('EntryValue[1]', 'varchar(max)') as EntryValue
        from @xmlInsertOrReplace.nodes('/Data/Record') as T(entity)) as dat
on 
    rep.ServerId = dat.ServerId and 
    rep.CompanyId = dat.CompanyId and
    rep.InstanceId = dat.InstanceId and
    rep.TemplateId = dat.TemplateId and
    rep.ContactId = dat.ContactId and 
    rep.RecordId = dat.RecordId and
    rep.EntryKey = dat.EntryKey
when MATCHED then update set
    rep.TaskId = dat.TaskId,
    rep.EntryDate = dat.EntryDate,
    rep.EntryValue = dat.EntryValue
when NOT MATCHED then
    insert (ServerId, CompanyId, InstanceId, TemplateId, ContactId, RecordId, TaskId, EntryDate, EntryKey, EntryValue)
    values (dat.ServerId, dat.CompanyId, dat.InstanceId, dat.TemplateId, dat.ContactId, dat.RecordId, dat.TaskId, dat.EntryDate, dat.EntryKey, dat.EntryValue);

当表中没有记录时，我期待的是第一个xml记录将被插入，第二个xml记录将被插入，第三个xml记录将更新第一个表记录，因为它符合条件。实际发生的是我得到3次插入而不是2次插入和1次更新。

结果屏幕截图：

有没有办法强制MERGE语句在每次插入或更新后执行COMMIT或其他操作？我不想分组xml记录或选择最大/最后一个。

更新

我使用了一个类似于第一个的合并操作。唯一的区别是这个值可以汇总这些值。

when MATCHED then update set
    rep.TaskId = dat.TaskId,
    rep.EntryDate = dat.EntryDate,
    rep.EntryValue = case len(isnull(rep.EntryValue, '')) when 0 then dat.EntryValue else rep.EntryValue + ';' + dat.EntryValue end

预期结果应为：

key_test_1 | value_test_1;value_test_3
key_test_2 | value_test_2

Answer 1

你可以试试这个：

使用ROW_NUMBER查找XML中的最新记录，然后忽略旧记录，无论如何都会覆盖...

WITH shreddedXML AS
(
    select 
        entity.value('ServerId[1]', 'int') as ServerId,
        entity.value('CompanyId[1]', 'int') as CompanyId,
        entity.value('InstanceId[1]', 'int') as InstanceId,
        entity.value('TemplateId[1]', 'int') as TemplateId,
        entity.value('ContactId[1]', 'bigint') as ContactId,
        entity.value('RecordId[1]', 'bigint') as RecordId,
        entity.value('TaskId[1]', 'bigint') as TaskId,
        entity.value('EntryDate[1]', 'datetime') as EntryDate,
        entity.value('EntryKey[1]', 'varchar(max)') as EntryKey,
        entity.value('EntryValue[1]', 'varchar(max)') as EntryValue
    from @xmlInsertOrReplace.nodes('/Data/Record') as T(entity)
)
,SearchForMostActualRows AS
(
    SELECT ROW_NUMBER() OVER(PARTITION BY ServerId,CompanyId,InstanceId,TemplateId,ContactId,RecordId,EntryKey ORDER BY EntryDate DESC) AS Nr
          ,*
    FROM shreddedXML
)
SELECT * 
FROM SearchForMostActualRows
WHERE Nr=1

现在用你的MERGE ......

当条件匹配新插入的记录时，T-Sql MERGE语句更新

1 个答案: