将pgsql变量放入VB参数函数

Imports System.Data
Imports Npgsql

' 连接PostgreSQL数据库
Dim connString As String = "Host=localhost;Port=5432;Database=mydb;Username=myuser;Password=mypassword;"
Dim conn As New NpgsqlConnection(connString)
conn.Open()

' 定义SQL查询语句
Dim sql As String = "SELECT * FROM mytable WHERE column = @param"

' 创建命令对象
Dim cmd As New NpgsqlCommand(sql, conn)

' 添加参数
cmd.Parameters.AddWithValue("@param", pgsqlVariable)

' 执行查询
Dim reader As NpgsqlDataReader = cmd.ExecuteReader()

' 处理查询结果
While reader.Read()
    ' 处理每一行数据
    Dim value As String = reader.GetString(0)
    ' ...
End While

' 关闭连接
reader.Close()
conn.Close()