C# 函数4

//数据库

    public class GF_DA

    {

        /// <summary>

        /// 执行SQL语句 sConnStr 连接字符串,sql执行的sql命令 返回第一行第一列

        /// </summary>

        /// <param name="sConnStr"></param>

        /// <param name="sql"></param>

        /// <returns></returns>

        public static object ExecSQL(string sConnStr, string sql)

        {

            using (SqlConnection conn = new SqlConnection(sConnStr))

            {

                using (SqlCommand cmd = new SqlCommand())

                {

                    try

                    {

                        conn.Open();

                        cmd.Connection = conn;

                        cmd.CommandText = sql;

                        return cmd.ExecuteScalar();

                    }

                    catch

                    {

                        return null;

                    }

                }

 

            }

        }

 

        /// <summary>

        /// 执行SQL数组  

        /// </summary>

        /// <param name="sConnStr"></param>

        /// <param name="alSql"></param>

        /// <param name="iLen"></param>

        public static void ExecSQL(string sConnStr, ArrayList alSql, int iLen)

        {

            using (SqlConnection conn = new SqlConnection(sConnStr))

            {

                using (SqlCommand cmd = new SqlCommand())

                {

                    try

                    {

                        conn.Open();

                        cmd.Connection = conn;

                        for (int i = 0; i < alSql.Count; i++)

                        {

                            cmd.CommandText = alSql[i].ToString();

                            cmd.ExecuteNonQuery();

                             

                        }

                    }

                    catch

                    {

 

                    }

                }

 

            }

        }

 

        /// <summary>

        /// 填充数据 返回DataTable

        /// </summary>

        /// <param name="sConnStr"></param>

        /// <param name="sql"></param>

        /// <param name="sTableName"></param>

        /// <returns></returns>

        public static DataTable DataFill(string sConnStr, string sql, string sTableName)

        {

            using (SqlConnection conn = new SqlConnection(sConnStr))

            {

                using (SqlCommand cmd = new SqlCommand())

                {

                    DataSet ds = new DataSet();

                    try

                    {

                        conn.Open();

                        cmd.Connection = conn;

                        cmd.CommandText = sql;

                        SqlDataAdapter ap = new SqlDataAdapter(cmd);

                        ap.Fill(ds, sTableName);

                        return ds.Tables[0];

                    }

                    catch

                    {

                        return null;

                    }

                }

 

 

            }

        }

    }

 

 

  /// <summary> 

        /// 加密

        /// </summary> 

        public class DES

        {

            //默认密钥向量

            private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };

        }