MES-ETL/TestProject1/DatabaseHelper.cs

using System.Data;
using System.Data.Common;
using MySqlConnector;

namespace TestProject1;

public static class DatabaseHelper
{
    public static async Task<DataSet> QueryTable(string connStr, string sql)
    {
        await using var conn = new MySqlConnection(connStr);
        if(conn.State is not ConnectionState.Open)
            await conn.OpenAsync();
        await using var cmd = conn.CreateCommand();
        cmd.CommandText = sql;
        var ds = new DataSet();
        var adapter = new MySqlDataAdapter(cmd).Fill(ds);
        return ds;
    }

    public static async Task<object?> QueryScalar(string connStr, string sql)
    {
        await using var conn = new MySqlConnection(connStr);
        if(conn.State is not ConnectionState.Open)
            await conn.OpenAsync();
        await using var cmd = conn.CreateCommand();
        cmd.CommandText = sql;
        return await cmd.ExecuteScalarAsync();
    }

    public static async Task<int> NonQuery(string connStr, string sql)
    {
        await using var conn = new MySqlConnection(connStr);
        if(conn.State is not ConnectionState.Open)
            await conn.OpenAsync();
        await using var cmd = conn.CreateCommand();
        cmd.CommandText = sql;
        return await cmd.ExecuteNonQueryAsync();
    }

    public static async Task<int> TransactionAsync(string connStr, string sql, params MySqlParameter[] parameters)
    {
        await using var conn = new MySqlConnection(connStr);
        if(conn.State is not ConnectionState.Open)
            await conn.OpenAsync();
        await using var trans = await conn.BeginTransactionAsync();
        await using var cmd = conn.CreateCommand();
        cmd.CommandText = sql;
        cmd.Transaction = trans;
        cmd.Parameters.AddRange(parameters);
        var rows = await cmd.ExecuteNonQueryAsync();
        await trans.CommitAsync();
        return rows;
    }
}