aspnetboilerplate && .net core 使用原生sql

利用aspnetboilerplate提供的工具类IDbContextProvider

private readonly IDbContextProvider<XXXDbContext> _provider;
public XXXAppService(IDbContextProvider<XXXDbContext> provider)
{
    _provider = provider;
}

public async Task Query()
{
    var sql="your sql";
    var tableList = _provider.GetDbContext().Query<Class>()
                             .FromSql(sql)
                             .AsNoTracking()
                             .ToList();
}

参考资料

Raw SQL Queries
How to execute a sql string in the application layer

比较原始 && 通用的方式

public class SqlHelper
{

    public DataTable QueryForDatable(string sql)
    {
        SqlConnection conn = new System.Data.SqlClient.SqlConnection();
        conn.ConnectionString = GetConnectionString(conn);
        if (conn.State != ConnectionState.Open)
        {
            conn.Open();
        }

        SqlCommand cmd = new SqlCommand();
        cmd.Connection = conn;
        cmd.CommandText = sql;

        SqlDataAdapter adapter = new SqlDataAdapter(cmd);
        DataTable table = new DataTable();
        adapter.Fill(table);

        conn.Close();
        conn.Dispose();
        return table;

    }

    //简而言之，拿到数据库链接字符串
    private static string GetConnectionString(SqlConnection conn)
    {
            //这里须要拿到appsettings.json所在文件夹路径
        var currentDirectoryPath = Directory.GetCurrentDirectory();
        var configuration = AppConfigurations.Get(currentDirectoryPath);
        //connectionStringName是数据库链接字符串在appsettings.json中的对应名称
        return configuration.GetConnectionString(connectionStringName);
    }

    /// <summary>
    /// SQL 语句返回 dataset
    /// </summary>
    /// <param name="sql"></param>
    /// <returns></returns>
    public DataSet QueryForListDataTable(string sql)
    {
        SqlConnection conn = new SqlConnection();
        conn.ConnectionString = GetConnectionString(conn);
        if (conn.State != ConnectionState.Open)
        {
            conn.Open();
        }
        SqlCommand cmd = new SqlCommand();
        cmd.Connection = conn;
        cmd.CommandText = sql;
        SqlDataAdapter adapter = new SqlDataAdapter(cmd);
        DataSet dataSet = new DataSet();
        adapter.Fill(dataSet);

        conn.Close();
        conn.Dispose();
        return dataSet;
    }
}