を使用して、クエリからの JSON 出力のネストを変更しようとしていますFOR JSON PATH。クエリはほとんど必要なものですが、完全ではFOR JSON AUTOありません。
を使用してクエリFOR JSON AUTO:
SELECT
table_name = tables.name,
table_object_id = tables.object_id,
index_name = indexes.name,
index_id = indexes.index_id,
column_name = columns.name,
column_id = index_columns.index_column_id,
max_length = columns.max_length,
precision = columns.precision,
scale = columns.scale
FROM
sys.indexes indexes
INNER JOIN
sys.index_columns index_columns ON indexes.object_id = index_columns.object_id and indexes.index_id = index_columns.index_id
INNER JOIN
sys.columns columns ON index_columns.object_id = columns.object_id and index_columns.column_id = columns.column_id
INNER JOIN
sys.tables tables ON indexes.object_id = tables.object_id
WHERE tables.name LIKE 'tbl_%'
ORDER BY
tables.name, indexes.index_id, index_columns.index_column_id
FOR JSON AUTO
出力を使用したクエリFOR JSON AUTO(スニペット):
.
.
.
{
"table_name": "tbl_Agent",
"table_object_id": 176055713,
"indexes": [
{
"index_name": "PK_Task_tbl_Agent",
"index_id": 1,
"columns": [
{
"column_name": "PartitionId",
"max_length": 4,
"precision": 10,
"scale": 0,
"index_columns": [
{
"column_id": 1
}
]
},
{
"column_name": "AgentId",
"max_length": 4,
"precision": 10,
"scale": 0,
"index_columns": [
{
"column_id": 2
}
]
}
]
},
{
"index_name": "IX_Task_tbl_Agent_PoolId_AgentName",
"index_id": 2,
"columns": [
{
"column_name": "PartitionId",
"max_length": 4,
"precision": 10,
"scale": 0,
"index_columns": [
{
"column_id": 1
}
]
},
{
"column_name": "PoolId",
"max_length": 4,
"precision": 10,
"scale": 0,
"index_columns": [
{
"column_id": 2
}
]
},
{
"column_name": "AgentName",
"max_length": 128,
"precision": 0,
"scale": 0,
"index_columns": [
{
"column_id": 3
}
]
}
]
},
{
"index_name": "IX_Task_tbl_Agent_PoolId_SessionId",
"index_id": 3,
"columns": [
{
"column_name": "PartitionId",
"max_length": 4,
"precision": 10,
"scale": 0,
"index_columns": [
{
"column_id": 1
}
]
},
{
"column_name": "PoolId",
"max_length": 4,
"precision": 10,
"scale": 0,
"index_columns": [
{
"column_id": 2
}
]
},
{
"column_name": "SessionId",
"max_length": 16,
"precision": 0,
"scale": 0,
"index_columns": [
{
"column_id": 3
}
]
}
]
}
]
},
.
.
.
各テーブルには適切にネストされたすべてのインデックスがあり、各インデックス内では、インデックスのすべての列 (これらは複合インデックス) が適切にネストされています。私が加えたい唯一の変更は、ネストを解除しindex_columnsて、column_idの一部にすることですcolumns。
.
.
.
"columns": [
{
"column_name": "PartitionId",
"max_length": 4,
"precision": 10,
"scale": 0,
---> "column_id": 1
},
{
"column_name": "PoolId",
"max_length": 4,
"precision": 10,
"scale": 0,
---> "column_id": 2
},
{
"column_name": "AgentName",
"max_length": 128,
"precision": 0,
"scale": 0,
---> "column_id": 3
}
]
.
.
.
ただし、を使用しようとするとFOR JSON PATH、不適切にネストされてしまいます。
を使用してクエリFOR JSON PATH:
SELECT
tables.name AS [tables.table_name],
tables.object_id AS [tables.table_object_id],
indexes.name AS [tables.indexes.index_name],
indexes.index_id AS [tables.indexes.index_id],
columns.name AS [tables.indexes.columns.column_name],
index_columns.index_column_id AS [tables.indexes.columns.column_id],
columns.max_length AS [tables.indexes.columns.max_length],
columns.precision AS [tables.indexes.columns.precision],
columns.scale AS [tables.indexes.columns.scale]
FROM
sys.indexes indexes
INNER JOIN
sys.index_columns index_columns ON indexes.object_id = index_columns.object_id and indexes.index_id = index_columns.index_id
INNER JOIN
sys.columns columns ON index_columns.object_id = columns.object_id and index_columns.column_id = columns.column_id
INNER JOIN
sys.tables tables ON indexes.object_id = tables.object_id
WHERE tables.name LIKE 'tbl_%'
ORDER BY
tables.name, indexes.index_id, index_columns.index_column_id
FOR JSON PATH
出力を使用したクエリFOR JSON PATH(スニペット):
.
.
.
{
"tables": {
===> "table_name": "tbl_Agent",
"table_object_id": 176055713,
"indexes": {
---> "index_name": "PK_Task_tbl_Agent",
"index_id": 1,
"columns": {
"column_name": "PartitionId",
"column_id": 1,
"max_length": 4,
"precision": 10,
"scale": 0
}
}
}
},
{
"tables": {
===> "table_name": "tbl_Agent",
"table_object_id": 176055713,
"indexes": {
---> "index_name": "PK_Task_tbl_Agent",
"index_id": 1,
"columns": {
"column_name": "AgentId",
"column_id": 2,
"max_length": 4,
"precision": 10,
"scale": 0
}
}
}
},
{
"tables": {
===> "table_name": "tbl_Agent",
"table_object_id": 176055713,
"indexes": {
"index_name": "IX_Task_tbl_Agent_PoolId_AgentName",
"index_id": 2,
"columns": {
"column_name": "PartitionId",
"column_id": 1,
"max_length": 4,
"precision": 10,
"scale": 0
}
}
}
},
.
.
.
whilecolumn_idは私が望んでいる場所ですが、columns適切にネストされているのは だけです。eachtableはその ごとに繰り返され、 each はそのindexesごとindexに繰り返されますcolumns。
適切なネスト (クエリからの出力など) を維持しながら、必要な場所 (クエリcolumn_idからの出力など)を取得するにはどうすればよいですか?FOR JSON PATHFOR JSON AUTO
更新 -- 動作中
DimaSUN の応答と Ben のコメントに基づいて、現在機能している次のクエリを思いつきました。
SELECT
tables.name AS [table_name],
tables.object_id AS [table_object_id],
(SELECT
indexes.name AS [index_name],
indexes.index_id AS [index_id],
(SELECT
columns.name AS [column_name],
index_columns.index_column_id AS [column_id],
columns.max_length AS [max_length],
columns.precision AS [precision],
columns.scale AS [scale]
FROM
sys.index_columns index_columns
JOIN
sys.columns columns ON index_columns.object_id = columns.object_id and index_columns.column_id = columns.column_id
WHERE
indexes.object_id = index_columns.object_id and indexes.index_id = index_columns.index_id
ORDER BY
index_columns.index_column_id
FOR JSON PATH
) AS 'columns'
FROM
sys.indexes indexes
WHERE
indexes.object_id = tables.object_id
ORDER BY
indexes.index_id
FOR JSON PATH
) AS 'indexes'
FROM
sys.tables tables
WHERE
tables.name LIKE 'tbl_%'
ORDER BY
tables.name
FOR JSON PATH, ROOT('tables')
新しいクエリ出力 (スニペット):
.
.
.
{
"table_name": "tbl_Agent",
"table_object_id": 176055713,
"indexes": [
{
"index_name": "PK_Task_tbl_Agent",
"index_id": 1,
"columns": [
{
"column_name": "PartitionId",
"column_id": 1,
"max_length": 4,
"precision": 10,
"scale": 0
},
{
"column_name": "AgentId",
"column_id": 2,
"max_length": 4,
"precision": 10,
"scale": 0
}
]
},
{
"index_name": "IX_Task_tbl_Agent_PoolId_AgentName",
"index_id": 2,
"columns": [
{
"column_name": "PartitionId",
"column_id": 1,
"max_length": 4,
"precision": 10,
"scale": 0
},
{
"column_name": "PoolId",
"column_id": 2,
"max_length": 4,
"precision": 10,
"scale": 0
},
{
"column_name": "AgentName",
"column_id": 3,
"max_length": 128,
"precision": 0,
"scale": 0
}
]
},
{
"index_name": "IX_Task_tbl_Agent_PoolId_SessionId",
"index_id": 3,
"columns": [
{
"column_name": "PartitionId",
"column_id": 1,
"max_length": 4,
"precision": 10,
"scale": 0
},
{
"column_name": "PoolId",
"column_id": 2,
"max_length": 4,
"precision": 10,
"scale": 0
},
{
"column_name": "SessionId",
"column_id": 3,
"max_length": 16,
"precision": 0,
"scale": 0
}
]
}
]
},
.
.
.
ネストされた選択の最後にある and は重要な部分でした。そうしないと、次のエラーが発生していたからですAS 'columns'。AS 'indexes'
Msg 13605, Level 16, State 1, Line 1
Unnamed tables cannot be used as JSON identifiers as well as unnamed columns cannot be used as key names. Add alias to the unnamed column/table.