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TCSystemCS/MetaDataDB/DB2Tags.cs at develop · tgoessler/TCSystemCS · GitHub
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// *******************************************************************************
//
// ******* *** *** *
// * * * *
// * * * *****
// * * *** * * ** * ** ***
// * * * * * * * **** * * *
// * * * * * * * * * * *
// * *** *** * ** ** ** * *
// *
// *******************************************************************************
// see https://github.com/tgoessler/TCSystemCS for details.
// Copyright (C) 2003 - 2026 Thomas Goessler. All Rights Reserved.
// *******************************************************************************
//
// TCSystem is the legal property of its developers.
// Please refer to the COPYRIGHT file distributed with this source distribution.
//
// *******************************************************************************
#region Usings
using
System
.
Collections
.
Generic
;
using
System
.
Linq
;
using
Microsoft
.
Data
.
Sqlite
;
using
TCSystem
.
MetaData
;
#endregion
namespace
TCSystem
.
MetaDataDB
;
internal
sealed
class
DB2Tags
(
DB2Instance
_instance
)
:
DB2Constants
{
#region Public
public
long
GetNumTags
(
SqliteTransaction
transaction
)
{
using
(
var
command
=
new
SqliteCommand
(
)
)
{
command
.
Connection
=
_instance
.
Connection
;
command
.
CommandText
=
$
"SELECT COUNT(
{
IdTagId
}
) FROM
{
TableTags
}
;"
;
object
result
=
command
.
ExecuteScalar
(
)
;
return
(
long
?
)
result
??
0
;
}
}
public
IList
<
string
>
GetAllTagsLikeOrderByNewestFile
(
string
filter
)
{
const
string
filterTagsCommand
=
"WHERE "
+
IdTag
+
" LIKE @Filter "
;
string
filterCommand
=
filter
!=
null
?
filterTagsCommand
:
""
;
if
(
filter
!=
null
)
{
filter
=
"%"
+
filter
.
Replace
(
' '
,
'%'
)
+
"%"
;
}
using
(
var
command
=
new
SqliteCommand
(
)
)
{
command
.
Connection
=
_instance
.
Connection
;
// create a query which select all IdTag and order them by date of the last file with this tag
command
.
CommandText
=
$
"SELECT DISTINCT
{
IdTag
}
FROM
{
TableTags
}
"
+
$
" INNER JOIN
{
TableFileTags
}
ON
{
TableTags
}
.
{
IdTagId
}
=
{
TableFileTags
}
.
{
IdTagId
}
"
+
$
" INNER JOIN
{
TableFileData
}
ON
{
TableFileData
}
.
{
IdFileId
}
=
{
TableFileTags
}
.
{
IdFileId
}
"
+
$
"
{
filterCommand
}
"
+
$
"ORDER by
{
TableFileData
}
.
{
IdDateTaken
}
ASC;"
;
command
.
Parameters
.
AddWithValue
(
"@Filter"
,
filter
)
;
using
(
SqliteDataReader
reader
=
command
.
ExecuteReader
(
)
)
{
var
tags
=
new
List
<
string
>
(
)
;
while
(
reader
.
Read
(
)
)
{
tags
.
Add
(
reader
.
GetString
(
0
)
)
;
}
return
tags
;
}
}
}
public
IList
<
string
>
GetAllTagsLike
(
string
filter
)
{
const
string
filterTagsCommand
=
"WHERE "
+
IdTag
+
" LIKE @Filter "
;
string
filterCommand
=
filter
!=
null
?
filterTagsCommand
:
""
;
if
(
filter
!=
null
)
{
filter
=
"%"
+
filter
.
Replace
(
' '
,
'%'
)
+
"%"
;
}
using
(
var
command
=
new
SqliteCommand
(
)
)
{
command
.
Connection
=
_instance
.
Connection
;
command
.
CommandText
=
$
"SELECT DISTINCT
{
IdTag
}
FROM
{
TableTags
}
{
filterCommand
}
ORDER by
{
IdTag
}
ASC;"
;
command
.
Parameters
.
AddWithValue
(
"@Filter"
,
filter
)
;
using
(
SqliteDataReader
reader
=
command
.
ExecuteReader
(
)
)
{
var
tags
=
new
List
<
string
>
(
)
;
while
(
reader
.
Read
(
)
)
{
tags
.
Add
(
reader
.
GetString
(
0
)
)
;
}
return
tags
;
}
}
}
public
IReadOnlyList
<
string
>
GetTags
(
long
fileId
,
SqliteTransaction
transaction
)
{
using
(
var
command
=
new
SqliteCommand
(
)
)
{
command
.
Transaction
=
transaction
;
command
.
Connection
=
_instance
.
Connection
;
command
.
CommandText
=
$
"SELECT
{
TableTags
}
.
{
IdTag
}
FROM
{
TableFileTags
}
"
+
$
" INNER JOIN
{
TableTags
}
ON
{
TableTags
}
.
{
IdTagId
}
=
{
TableFileTags
}
.
{
IdTagId
}
"
+
$
"WHERE
{
IdFileId
}
=@
{
IdFileId
}
;"
;
command
.
Parameters
.
AddWithValue
(
$
"@
{
IdFileId
}
"
,
fileId
)
;
using
(
SqliteDataReader
reader
=
command
.
ExecuteReader
(
)
)
{
var
tags
=
new
List
<
string
>
(
)
;
while
(
reader
.
Read
(
)
)
{
tags
.
Add
(
reader
.
GetString
(
0
)
)
;
}
return
tags
;
}
}
}
public
void
SetTags
(
long
fileId
,
IReadOnlyList
<
string
>
newTags
,
IReadOnlyList
<
string
>
oldTags
,
SqliteTransaction
transaction
)
{
foreach
(
var
tag
in
newTags
.
Where
(
tag
=>
!
oldTags
.
Contains
(
tag
)
)
)
{
AddTag
(
fileId
,
tag
,
transaction
)
;
}
foreach
(
var
tag
in
oldTags
.
Where
(
tag
=>
!
newTags
.
Contains
(
tag
)
)
)
{
RemoveTag
(
fileId
,
tag
,
transaction
)
;
}
}
public
IList
<
string
>
GetFilesOfTag
(
string
tag
)
{
using
(
var
command
=
new
SqliteCommand
(
)
)
{
command
.
Connection
=
_instance
.
Connection
;
command
.
CommandText
=
$
"SELECT DISTINCT
{
TableFiles
}
.
{
IdFileName
}
"
+
$
"FROM
{
TableFileTags
}
"
+
$
" INNER JOIN
{
TableTags
}
ON
{
TableTags
}
.
{
IdTagId
}
=
{
TableFileTags
}
.
{
IdTagId
}
"
+
$
" INNER JOIN
{
TableFiles
}
ON
{
TableFiles
}
.
{
IdFileId
}
=
{
TableFileTags
}
.
{
IdFileId
}
"
+
$
" INNER JOIN
{
TableFileData
}
ON
{
TableFileData
}
.
{
IdFileId
}
=
{
TableFileTags
}
.
{
IdFileId
}
"
+
$
"WHERE
{
TableTags
}
.
{
IdTag
}
LIKE @
{
IdTag
}
ESCAPE '?' "
+
$
"ORDER by
{
TableFileData
}
.
{
IdDateTaken
}
DESC;"
;
command
.
Parameters
.
AddWithValue
(
$
"@
{
IdTag
}
"
,
tag
+
"%"
)
;
using
(
SqliteDataReader
reader
=
command
.
ExecuteReader
(
)
)
{
var
fileNames
=
new
List
<
string
>
(
)
;
while
(
reader
.
Read
(
)
)
{
fileNames
.
Add
(
reader
.
GetString
(
0
)
)
;
}
return
fileNames
;
}
}
}
public
long
GetNumFilesOfTag
(
string
tag
)
{
using
(
var
command
=
new
SqliteCommand
(
)
)
{
command
.
Connection
=
_instance
.
Connection
;
command
.
CommandText
=
$
"SELECT DISTINCT COUNT(
{
TableFiles
}
.
{
IdFileName
}
) "
+
$
"FROM
{
TableFileTags
}
"
+
$
" INNER JOIN
{
TableTags
}
ON
{
TableTags
}
.
{
IdTagId
}
=
{
TableFileTags
}
.
{
IdTagId
}
"
+
$
" INNER JOIN
{
TableFiles
}
ON
{
TableFiles
}
.
{
IdFileId
}
=
{
TableFileTags
}
.
{
IdFileId
}
"
+
$
" INNER JOIN
{
TableFileData
}
ON
{
TableFileData
}
.
{
IdFileId
}
=
{
TableFileTags
}
.
{
IdFileId
}
"
+
$
"WHERE
{
TableTags
}
.
{
IdTag
}
LIKE @
{
IdTag
}
ESCAPE '?' "
+
$
"ORDER by
{
TableFileData
}
.
{
IdDateTaken
}
DESC;"
;
command
.
Parameters
.
AddWithValue
(
$
"@
{
IdTag
}
"
,
tag
+
"%"
)
;
object
result
=
command
.
ExecuteScalar
(
)
;
return
(
long
?
)
result
??
0
;
}
}
public
void
RemoveTag
(
string
tag
,
SqliteTransaction
transaction
)
{
long
id
=
GetTagId
(
tag
,
transaction
)
;
if
(
id
!=
Constants
.
InvalidId
)
{
using
(
var
command
=
new
SqliteCommand
(
)
)
{
command
.
Transaction
=
transaction
;
command
.
Connection
=
_instance
.
Connection
;
command
.
CommandText
=
$
"DELETE From
{
TableTags
}
WHERE
{
IdTagId
}
=@
{
IdTagId
}
;"
;
command
.
Parameters
.
AddWithValue
(
$
"@
{
IdTagId
}
"
,
id
)
;
command
.
ExecuteNonQuery
(
)
;
}
}
}
#endregion
#region Private
private
long
GetTagId
(
string
tag
,
SqliteTransaction
transaction
)
{
using
(
var
command
=
new
SqliteCommand
(
)
)
{
command
.
Transaction
=
transaction
;
command
.
Connection
=
_instance
.
Connection
;
command
.
CommandText
=
$
"SELECT
{
IdTagId
}
FROM
{
TableTags
}
WHERE
{
IdTag
}
=@
{
IdTag
}
"
;
command
.
Parameters
.
AddWithValue
(
$
"@
{
IdTag
}
"
,
tag
)
;
object
result
=
command
.
ExecuteScalar
(
)
;
return
(
long
?
)
result
??
Constants
.
InvalidId
;
}
}
private
long
AddTag
(
string
tag
,
SqliteTransaction
transaction
)
{
long
tagId
=
Constants
.
InvalidId
;
if
(
tag
.
Length
>
0
)
{
tagId
=
GetTagId
(
tag
,
transaction
)
;
if
(
tagId
==
Constants
.
InvalidId
)
{
using
(
var
command
=
new
SqliteCommand
(
)
)
{
command
.
Transaction
=
transaction
;
command
.
Connection
=
_instance
.
Connection
;
command
.
CommandText
=
$
"INSERT INTO
{
TableTags
}
(
{
IdTag
}
) VALUES(@
{
IdTag
}
);"
;
command
.
Parameters
.
AddWithValue
(
$
"@
{
IdTag
}
"
,
tag
)
;
command
.
ExecuteNonQuery
(
)
;
}
tagId
=
GetTagId
(
tag
,
transaction
)
;
}
}
return
tagId
;
}
private
void
AddTag
(
long
fileId
,
string
tag
,
SqliteTransaction
transaction
)
{
long
tagId
=
AddTag
(
tag
,
transaction
)
;
if
(
tagId
!=
Constants
.
InvalidId
)
{
using
(
var
command
=
new
SqliteCommand
(
)
)
{
command
.
Transaction
=
transaction
;
command
.
Connection
=
_instance
.
Connection
;
command
.
CommandText
=
$
"INSERT INTO
{
TableFileTags
}
(
{
IdFileId
}
,
{
IdTagId
}
) VALUES(@
{
IdFileId
}
, @
{
IdTagId
}
);"
;
AddTagParameters
(
fileId
,
tagId
,
command
)
;
command
.
ExecuteNonQuery
(
)
;
}
}
}
private
void
RemoveTag
(
long
fileId
,
string
tag
,
SqliteTransaction
transaction
)
{
long
tagId
=
GetTagId
(
tag
,
transaction
)
;
if
(
tagId
!=
Constants
.
InvalidId
)
{
using
(
var
command
=
new
SqliteCommand
(
)
)
{
command
.
Transaction
=
transaction
;
command
.
Connection
=
_instance
.
Connection
;
command
.
CommandText
=
$
"DELETE FROM
{
TableFileTags
}
WHERE
{
IdFileId
}
=@
{
IdFileId
}
AND
{
IdTagId
}
=@
{
IdTagId
}
;"
;
AddTagParameters
(
fileId
,
tagId
,
command
)
;
command
.
ExecuteNonQuery
(
)
;
}
}
}
private
static
void
AddTagParameters
(
long
fileId
,
long
tagId
,
SqliteCommand
command
)
{
command
.
Parameters
.
AddWithValue
(
$
"@
{
IdFileId
}
"
,
fileId
)
;
command
.
Parameters
.
AddWithValue
(
$
"@
{
IdTagId
}
"
,
tagId
)
;
}
#endregion
}
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