# JSON_REPLACE

> StackQL で SQL を使って JSON ドキュメント内の既存の値を置き換えます。

Source: https://stackql.io/ja/language-spec/functions/json/json_replace

パスに基づいて JSON オブジェクト内の既存の値を更新します。`JSON_REPLACE` はドキュメントに新しいキーを追加せず、既存のキーの値のみを置き換えます。

関連項目：  
[[`SELECT`]](/language-spec/select) [[` JSON_EXTRACT `]](/language-spec/functions/json/json_extract) [[` JSON_SET `]](/language-spec/functions/json/json_set) [[` JSON_REPLACE `]](/language-spec/functions/json/json_replace)

* * * 

## 構文

```sql
SELECT JSON_REPLACE(json_column, path, new_value) FROM <multipartIdentifier>;
```

## 引数

__*json_column*__  
値を置き換える対象の JSON 列または式。

__*path*__  
JSON ドキュメント内で置き換えを行う位置を指す JSON パス式。パスは既存のキーを指している必要があります。

__*new_value*__  
JSON ドキュメントの指定したパスで置き換える新しい値。

## 戻り値
指定した値を置き換えた、変更後の JSON ドキュメントを返します。指定したパスが存在しない場合は、元の JSON ドキュメントが変更されずに返されます。

:::note キーが存在する場合の動作

| 関数                                                         | すでに存在する場合に上書き | 存在しない場合に作成 |
|--------------------------------------------------------------|----------------------------|----------------------|
| [`json_insert()`](/language-spec/functions/json/json_insert) | いいえ                     | はい                 |
| [`json_replace()`](/language-spec/functions/json/json_replace) | はい                       | いいえ               |
| [`json_set()`](/language-spec/functions/json/json_set)       | はい                       | はい                 |

:::

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## 例

### JSON オブジェクト内の単一の値を置き換える

```sql
SELECT sku as original,
JSON_REPLACE(sku, '$.name', 'Standard_EU') as updated
FROM azure.container_registry.registries 
WHERE registry_name = 'exampleRegistryProd' 
AND subscription_id = '12345678-abcd-1234-abcd-1234abcd5678' 
AND resource_group_name = 'exampleResourceGroupProd';
/* expected output...
|---------------------------------------|------------------------------------------|
|               original                |                 updated                  |
|---------------------------------------|------------------------------------------|
| {"name":"Standard","tier":"Standard"} | {"name":"Standard_EU","tier":"Standard"} |
|---------------------------------------|------------------------------------------|
*/
```

### JSON オブジェクト内の複数の値を置き換える

**クエリ**

```sql
select
  properties beforechange,
  json_replace(json_remove(properties,
              '$.allowPort25Out',
              '$.auxiliarySku',
              '$.provisioningState',
              '$.resourceGuid',
              '$.macAddress',
              '$.vnetEncryptionSupported',
              '$.enableIPForwarding',
              '$.defaultOutboundAccess',
              '$.primary',
              '$.virtualMachine',
              '$.hostedWorkloads',
              '$.tapConfigurations',
              '$.nicType',
              '$.auxiliaryMode',
              '$.ipConfigurations[0].id',
              '$.ipConfigurations[0].etag',
              '$.ipConfigurations[0].type',
              '$.ipConfigurations[0].properties.provisioningState',
              '$.ipConfigurations[0].properties.privateIPAddress',
              '$.ipConfigurations[0].properties.privateIPAllocationMethod',
              '$.ipConfigurations[0].properties.primary',
              '$.ipConfigurations[0].properties.privateIPAddressVersion'
            ),
  '$.ipConfigurations[0].name',
  'vmss-flex-vnet-nic01-defaultIpConfiguration'
  ) afterchange
from
  azure.network.network_interfaces
where subscription_id = '0123456789'
and resource_group_name = 'vm-rg'
and network_interface_name = 'vm1450_z1'
```

**出力（JSON）**

```json
[{"afterchange": 
{
  "disableTcpStateTracking": false,
  "dnsSettings": {
    "appliedDnsServers": [],
    "dnsServers": [],
    "internalDomainNameSuffix": "02ylkvekgslelowidrppwubzmb.bx.internal.cloudapp.net"
  },
  "enableAcceleratedNetworking": false,
  "ipConfigurations": [
    {
      "name": "vmss-flex-vnet-nic01-defaultIpConfiguration",
      "properties": {
        "publicIPAddress": {
          "id": "/subscriptions/0123456789/resourceGroups/vm-rg/providers/Microsoft.Network/publicIPAddresses/vm1-ip",
          "properties": {
            "deleteOption": "Delete"
          }
        },
        "subnet": {
          "id": "/subscriptions/0123456789/resourceGroups/vm-rg/providers/Microsoft.Network/virtualNetworks/vm1-vnet/subnets/default"
        }
      }
    }
  ],
  "networkSecurityGroup": {
    "id": "/subscriptions/0123456789/resourceGroups/vm-rg/providers/Microsoft.Network/networkSecurityGroups/vm1-nsg"
  }
},
"beforechange": 
{
  "allowPort25Out": false,
  "auxiliaryMode": "None",
  "auxiliarySku": "None",
  "disableTcpStateTracking": false,
  "dnsSettings": {
    "appliedDnsServers": [],
    "dnsServers": [],
    "internalDomainNameSuffix": "123ylkvekgslelowidrppwubzmb.bx.internal.cloudapp.net"
  },
  "enableAcceleratedNetworking": false,
  "enableIPForwarding": false,
  "hostedWorkloads": [],
  "ipConfigurations": [
    {
      "etag": "123-bc7e-4609-9328-709fe04c69c3",
      "id": "/subscriptions/0123456789/resourceGroups/vm-rg/providers/Microsoft.Network/networkInterfaces/vm1450_z1/ipConfigurations/ipconfig1",
      "name": "ipconfig1",
      "properties": {
        "primary": true,
        "privateIPAddress": "10.0.0.4",
        "privateIPAddressVersion": "IPv4",
        "privateIPAllocationMethod": "Dynamic",
        "provisioningState": "Succeeded",
        "publicIPAddress": {
          "id": "/subscriptions/0123456789/resourceGroups/vm-rg/providers/Microsoft.Network/publicIPAddresses/vm1-ip",
          "properties": {
            "deleteOption": "Delete"
          }
        },
        "subnet": {
          "id": "/subscriptions/0123456789/resourceGroups/vm-rg/providers/Microsoft.Network/virtualNetworks/vm1-vnet/subnets/default"
        }
      },
      "type": "Microsoft.Network/networkInterfaces/ipConfigurations"
    }
  ],
  "macAddress": "23-0D-3A-1B-FF-91",
  "networkSecurityGroup": {
    "id": "/subscriptions/0123456789/resourceGroups/vm-rg/providers/Microsoft.Network/networkSecurityGroups/vm1-nsg"
  },
  "nicType": "Standard",
  "primary": true,
  "provisioningState": "Succeeded",
  "resourceGuid": "566a1d71-923d-41e0-bbd5-d09bf64cbe7b",
  "tapConfigurations": [],
  "virtualMachine": {
    "id": "/subscriptions/0123456789/resourceGroups/vm-rg/providers/Microsoft.Compute/virtualMachines/vm1"
  },
  "vnetEncryptionSupported": false
}
}]
```