F# Deedle 将帧保存到 MySql 数据库

要将帧保存到 MySQL 数据库，需要使用 F# Deedle 库和 MySqlConnector 库。下面是一个示例代码：

open Deedle
open MySqlConnector

let saveFrameToMySQL (frame: Frame<_,_>) (tableName: string) =
    let connectionString = "Server=localhost;Database=myDatabase;Uid=myUsername;Pwd=myPassword;" // 根据实际情况修改连接字符串

    use connection = new MySqlConnection(connectionString)
    connection.Open()

    use command = new MySqlCommand()
    command.Connection <- connection

    // 创建表格
    let createTableQuery = sprintf "CREATE TABLE IF NOT EXISTS %s (IndexColumn INT, KeyColumn VARCHAR(255), ValueColumn DOUBLE);" tableName
    command.CommandText <- createTableQuery
    command.ExecuteNonQuery()

    // 插入数据
    for row in frame.Rows do
        let index = row.Key
        let series = row.Value

        for key, value in series do
            let insertQuery = sprintf "INSERT INTO %s (IndexColumn, KeyColumn, ValueColumn) VALUES (%d, '%s', %f);" tableName index key value
            command.CommandText <- insertQuery
            command.ExecuteNonQuery()

// 使用示例
let frame = Frame.ofColumns [ "A" => series [ 1 => 1.0; 2 => 2.0 ]
                              "B" => series [ 1 => 3.0; 2 => 4.0 ] ]

saveFrameToMySQL frame "MyTable"

请确保已安装 F# Deedle 和 MySqlConnector 库，并根据实际情况修改连接字符串。此示例代码创建了一个名为 MyTable 的表格，然后将帧的索引、键和值插入到表格中。