solr 增量导入性能问题解决方案
代码示例：
<dataConfig>
<dataSource type="JdbcDataSource"
driver="com.microsoft.sqlserver.jdbc.SQLServerDriver"
url="jdbc:sqlserver://localhost;databaseName=AdventureWorks2014"
user="sa"
password="sa"/>
<document>
<entity name="address"
pk="id"
query="SELECT ,, FROM .."
deltaImportQuery="SELECT -1 as deltaImportQuery,,, FROM .. WHERE ModifiedDate > '${dih.address.last_index_time}'"
deltaQuery="SELECT -1 as>
deletedPkQuery="SELECT as> >
<field column="AddressID" name="id"/>
<field column="AddressLine1" name="title"/>
<field column="ModifiedDate" name="postdatetime"/>
</entity>
</document>
</dataConfig>
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