vb.net - PostgreSQL:VB.NET ODBC 更新无法正常工作

Question

VB.NET 2019

Postgres 10

PostgreODBC

DBeaver 中的源数据:

https://i86.fastpic.ru/big/2019/0716/b9/_8741664f3e9495646d995a9d96b846b9.png

试图改变 SQL 状态，改变传递的参数:

'Dim command As New Odbc.OdbcCommand("UPDATE public.v8users SET Data = @data WHERE ID = @id", Connection) 'MSSQL syntax
'Dim command As New Odbc.OdbcCommand("UPDATE public.v8users SET data = ?, name = ? WHERE id = ?", Connection)
'Dim command As New Odbc.OdbcCommand("UPDATE public.v8users SET data = ?data WHERE id = ?id", Connection) 'MySQL syntax
'Dim command As New Odbc.OdbcCommand("UPDATE public.v8users SET data = ? WHERE id = decode(encode(?, 'hex'), 'hex')", Connection) 'PostgreSQL syntax

'command.Parameters.Add(New Odbc.OdbcParameter("@id", SQLUser.ID))
'command.Parameters.Add(New Odbc.OdbcParameter("@data", NewBytes))
'command.Parameters.Add(New Odbc.OdbcParameter("id", SqlDbType.Binary)).Value = SQLUser.ID
'command.Parameters.Add(New Odbc.OdbcParameter("data", SqlDbType.Binary)).Value = NewBytes
'command.Parameters.Add(New Odbc.OdbcParameter("name", Odbc.OdbcType.Binary)).Value = NewBytes

Structure SQLUser
   Dim ID As Byte()
   Dim IDStr As String
   Dim Name As String
   Dim Descr As String
   Dim Data As Byte()
   Dim DataStr As String
   Dim PassHash As String
   Dim PassHash2 As String
   Dim AdmRole As String
   Dim KeySize As Integer
   Dim KeyData As Byte()
End Structure

Dim a
Dim Connection = New Odbc.OdbcConnection("Driver={PostgreSQL Unicode};Server=192.168.2.10;Database=TestPurp;Uid=<correct>;Pwd=<correct>;UseServerSidePrepare=1;ReadOnly=0")
Dim command As New Odbc.OdbcCommand("UPDATE public.v8users SET data = ? WHERE id = ?", Connection)
command.Parameters.Clear()
command.Parameters.Add(New Odbc.OdbcParameter("id", Odbc.OdbcType.Binary)).Value = SQLUser.ID
command.Parameters.Add(New Odbc.OdbcParameter("data", Odbc.OdbcType.Binary)).Value = NewBytes
a = command.ExecuteNonQuery()

a = 0，期望 a = 1

Answer 1

尝试按照它们在更新语句中出现的相同顺序添加参数。先添加数据再添加id。

command.Parameters.Add(New Odbc.OdbcParameter("data", Odbc.OdbcType.Binary)).Value = NewBytes
command.Parameters.Add(New Odbc.OdbcParameter("id", Odbc.OdbcType.Binary)).Value = SQLUser.ID

这在 Access 中与 OleDb 提供程序的工作方式相同。