如果nvarchar(max)更新或插入TableJSON，如何将所有 JSON列[TableXML]从TableJSON转换为nvarchar(max)中的XML列（在触发器中）？
获取所有DECLARE @COLUMN_NAME nvarchar(max)
SELECT @COLUMN_NAME = COLUMN_NAME
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = 'TableJSON'
AND DATA_TYPE LIKE 'nvarchar'
AND CHARACTER_MAXIMUM_LENGTH = -1 --NVARCHAR(MAX)
列：
ID bigint,
Code char(10),
Field1 nvarchar(max),
...
Field100 nvarchar(max)
将JSON转换为XML： https://www.simple-talk.com/sql/t-sql-programming/consuming-json-strings-in-sql-server/
TableJSON：
ID bigint,
Code char(10),
Field1 xml,
...
Field100 xml
TableXML：
Field1我的触发器（目前仅适用于SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER TRIGGER [dbo].[UpdateXMLTable]
ON [dbo].[TableJSON]
AFTER INSERT, UPDATE
AS
BEGIN
DECLARE @ID bigint
DECLARE @Field1 nvarchar(max)
DECLARE @MyHierarchy Hierarchy,@Field1XML XML
SELECT @ID = ID,
@Field1 = Field1
FROM INSERTED
INSERT INTO @myHierarchy
SELECT * FROM parseJSON(@Field1)
SELECT dbo.ToXML(@MyHierarchy)
SET @Field1XML = dbo.ToXML(@MyHierarchy)
IF NOT EXISTS(SELECT 1 FROM [dbo].[TableXML] WHERE ID = @ID)
INSERT INTO [dbo].[TableXML] (ID, Field1) VALUES (@ID, @Field1XML)
ELSE
IF (UPDATE (Field1))
UPDATE [dbo].[TableXML] SET Field1 = @Field1XML WHERE ID = @ID
END
）：
TableJSON如何将TableXML中的所有 JSON列从public function clock_in()
{
$this->load->model('model_users');
$this->db->where('USER_EMAIL', $this->session->userdata('USER_EMAIL'));
$query = $this->db->get('clocked_in_users');
if($query->num_rows() == 1){
echo "Already Clocked in";
exit;
}else{
$this->model_users->clock_user_in();
};
redirect('main/members');
}
转换为XML列？