SQL for XML path usage in server

Read Catalogue

• Create a test table & Insert test data
• The FOR XML path uses the
  • General usage
  • Custom node Name
  • property of the field as XML

We usually need to get a string that is spelled out by a field of multiple rows, and we can use the FOR XML path to handle it; The specific use of the FOR XML path is described below.

Back to top Create test table & Insert test data

Add a test table to the database

CREATE TABLE MyTest (  UserName varchar),  Email varchar (100))

Inserting test data

View Code

The database has the following two data

Go back to the top for XML path using

General usage

Creating XML with the root node as user

SELECT UserName, Email from MyTest for XML PATH (' User ')

Operation Result:

<User>  <UserName> Zhang San </UserName>  <email>[email protected]</email></user ><User>  <UserName> John Doe </UserName>  <email>[email protected]</email></ User>

Custom node Name

Alias the corresponding field, username alias to MyUser as follows

SELECT UserName as MyUser, Email from  MyTest for XML PATH (' User ')

Run results

<User>  <MyUser> Zhang San </MyUser>  <email>[email protected]</email></user> <User>  <MyUser> John Doe </MyUser>  <email>[email protected]</email></user>

property of the field as XML

You can alias with as ' @ at query time. ' Like ' @value '

SELECT UserName as ' @UserName ', Email as ' @Email ' from  MyTest for XML PATH (' User ')

Run results

<user username= "Zhang San" email= "[email protected]"/><user username= "John Doe" email= "[email protected]"/>

Row-to-column stitching string

If all names are stitched together, separated by a string

SELECT username+ ', ' from MyTest for XML PATH (')

Results

Zhang San, John Doe,

There is one more, need to be processed again, by processing the string will be the last comma is removed, can be processed by the left function in SQL, here does not introduce;

Refer to my other article for specific usage----functions commonly used to intercept strings in SQL Server

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SQL for XML Path usage

in SQL Server