C# 获取数据库最终执行的SQL语句（土方法）

1.给DbCommand抽象类添加一个扩展方法

    /// <summary>
    /// 给DbCommand抽象类添加一个扩展方法
    /// 生成一个最终执行的SQL语句
    /// </summary>
    public static class DcCommandHelper
    {
        public static string GetExecutedCommand(this DbCommand dbCommand, string commandText, IDbDataParameter[] dbDataParameters)
        {
            foreach (var parameter in dbDataParameters)
            {
                string pname = parameter.ParameterName;
                string pvalue = Convert.ToString(parameter.Value);
                commandText = commandText.Replace(pname, pvalue);
            }
            return commandText;
        }
    }

2.实际使用案例

        public static object ExecuteScalar(string commandText, params IDbDataParameter[] dbDataParameters)
        {
            using (DbConnection conn = DbFactory.CreateDbConnection(connString, providerName))
            {
                conn.Open();
                DbCommand cmd = CreateDbCommand(conn, commandText, CommandType.Text, dbDataParameters);
                string sqlCommand = cmd.GetExecutedCommand(commandText, dbDataParameters);
                Console.WriteLine(sqlCommand);
                return cmd.ExecuteScalar();
            }
        }

    class Program
    {
        static void Main(string[] args)
        {
            string sql = "select * from dbo.aspnet_Users where UserName = @UserName or UserId =@UserId";
            DAL.DbHelper.ExecuteScalar(sql,
                new SqlParameter("@UserName", "admin"),
                new SqlParameter("@UserId", "522C7EFE-DC3A-45E8-B101-DFFDC005CC68"));
            Console.ReadKey();
        }
    }

3.控制台窗口执行结果：select * from dbo.aspnet_Users where UserName = admin or UserId =522C7EFE-DC3A-45E8-B101-DFFDC005CC68

 

 

PS:说白了就是字符串替换而已。