使用 PowerShell 从 SQL Server 导出到 json 文本文件

Question

如果您想了解如何将 SQL Server 数据转换为 JSON 并将其放入文本 .json 文件中，则应该阅读此内容：

问题：

有人能告诉我这段代码有什么问题吗？我的目标是从 SQL Server 表中读取数据，将其转换为 JSON，然后将结果保存为 JSON 文本文件。代码运行但生成的.json文件只有：

{
        "FieldCount":  11
    },
    {

一遍又一遍地重复，仅此而已。

我的代码：

$instance = "localhost\SQLEXPRESS"
$connectionString = "Server=$Instance; Database=myDB;Integrated Security=True;"
$query = "Select  * from myTable"
$connection = New-Object System.Data.SqlClient.SqlConnection
$connection.ConnectionString = $connectionString
$connection.Open()
$command = $connection.CreateCommand()
$command.CommandText = $query
$result = $command.ExecuteReader()
$result | ConvertTo-Json | Out-File "file.json"

$connection.Close()

更新：

将奖励 postanote 的答案，因为从技术上讲，他/她回答了我原来的问题（尽管我会警告并说我还没有尝试过）。

不过，我会推荐 Mike 的答案或我最终使用 BCP 的答案：

bcp "select * from myTable FOR JSON AUTO" queryout "C:\filepath\testsml.json"  -c -S ".\SQLEXPRESS" -d myDBName -T

• 请注意，JSON AUTO 会自动为您提供一个 json scehma，而 JSON 管道则允许您对其进行自定义。
• 您必须先安装BCP： https://learn.microsoft.com/en-us/sql/tools/bcp-utility? view=sql-server-2017

Answer 1

如果您使用的是 sql server express 2016 或更高版本，您应该能够使用 FOR JSON 子句在数据库端执行此操作。尝试类似的东西

$instance = "localhost\SQLEXPRESS"
$connectionString = "Server=$Instance; Database=myDB;Integrated Security=True;"
$query = "Select  * from myTable FOR JSON AUTO"
$connection = New-Object System.Data.SqlClient.SqlConnection
$connection.ConnectionString = $connectionString
$connection.Open()
$command = $connection.CreateCommand()
$command.CommandText = $query
$command.ExecuteScalar() | Out-File "file.json"

Answer 2

尝试像这样的 \xe2\x80\xa6

\n\n

### Exporting SQL Server table to JSON\n\nClear-Host\n\n#--Establishing connection to SQL Server --# \n\n$InstanceName = "."\n$connectionString = "Server=$InstanceName;Database=msdb;Integrated Security=True;"\n\n#--Main Query --# \n\n$query = "SELECT * FROM sysjobs"\n\n$connection = New-Object System.Data.SqlClient.SqlConnection\n$connection.ConnectionString = $connectionString\n\n$connection.Open()\n$command = $connection.CreateCommand()\n$command.CommandText = $query\n\n$result = $command.ExecuteReader()\n\n$table = new-object "System.Data.DataTable"\n\n$table.Load($result)\n\n#--Exporting data to the screen --# \n\n$table | select $table.Columns.ColumnName | ConvertTo-Json\n\n$connection.Close()\n\n# Results\n\n{\n    "job_id":  "5126aca3-1003-481c-ab36-60b45a7ee757",\n    "originating_server_id":  0,\n    "name":  "syspolicy_purge_history",\n    "enabled":  1,\n    "description":  "No description available.",\n    "start_step_id":  1,\n    "category_id":  0,\n    "owner_sid":  [\n                      1\n                  ],\n    "notify_level_eventlog":  0,\n    "notify_level_email":  0,\n    "notify_level_netsend":  0,\n    "notify_level_page":  0,\n    "notify_email_operator_id":  0,\n    "notify_netsend_operator_id":  0,\n    "notify_page_operator_id":  0,\n    "delete_level":  0,\n    "date_created":  "\\/Date(1542859767703)\\/",\n    "date_modified":  "\\/Date(1542859767870)\\/",\n    "version_number":  5\n}\n

\n