数据库链接 mysql，sqlserver

1.生成对象工厂

/// <summary>
    /// 生成对象工厂
    /// </summary>
    public class DBFactory
    {
        /// <summary>
        /// 创造实例
        /// </summary>
        /// <typeparam name="T">类型</typeparam>
        /// <param name="assemblyString">程序集名称</param>
        /// <param name="typeName">类的全名</param>
        /// <param name="parameters">构造函数参数</param>
        /// <returns></returns>
        public T Creatobject<T>(string assemblyString, string typeName, Object[] parameters)
        {
            try
            {
                return (T)System.Reflection.Assembly.Load(assemblyString).CreateInstance(typeName, true, System.Reflection.BindingFlags.Default, null, parameters, null, null);
            }
            catch (Exception ex)
            {
                string s = ex.Message;
            }
            return default(T);
        }
    }//end

2.数据库接口

 public interface IDataBase
    {
        /// <summary>
        /// 关闭数据库
        /// </summary>
        /// <param name="Link"></param>
        void CloseDataBase(DbConnection Link);
        /// <summary>
        /// 获取命令
        /// </summary>
        /// <param name="query"></param>
        /// <returns></returns>
        DbCommand GetSqlStringCommand(string query);
        /// <summary>
        /// 增加输入参数
        /// </summary>
        /// <param name="cmd"></param>
        /// <param name="ParmsName"></param>
        /// <param name="ParmsType"></param>
        /// <param name="value"></param>
        void AddInParameter(DbCommand cmd, string ParmsName, DbType ParmsType, object value);
        /// <summary>
        /// 增加输出参数
        /// </summary>
        /// <param name="cmd"></param>
        /// <param name="ParmsName"></param>
        /// <param name="ParmsType"></param>
        /// <param name="value"></param>
        void AddOutParameter(DbCommand cmd, string ParmsName, DbType ParmsType, object value);

        /// <summary>
        /// 执行获取DataSet
        /// </summary>
        /// <param name="cmd"></param>
        /// <returns></returns>
        DataSet ExecuteDataSet(DbCommand cmd);
        /// <summary>
        /// 执行sql语句返回受影响的行数
        /// </summary>
        /// <param name="cmd"></param>
        /// <returns></returns>
        int ExecuteNonQuery(DbCommand cmd);
        /// <summary>
        /// 获取存储过程执行命令
        /// </summary>
        /// <param name="ProcName"></param>
        /// <returns></returns>
        DbCommand GetStoredProcCommand(string ProcName);
        /// <summary>
        /// 获取输出参数值或者输出参数的字典
        /// </summary>
        /// <param name="cmd"></param>
        /// <param name="ParmsName"></param>
        /// <returns></returns>
        object GetParameterValueOrKeyValue(DbCommand cmd, string ParmsName = "");
    }//end

3.mysql 实现接口

 /// <summary>
    /// mysql 实现接口
    /// </summary>
    public class MySQLHelper : IDataBase
    {
        internal MySqlConnection Link;
        public MySQLHelper()
        {

        }
        public MySQLHelper(string ConnectionStrings)
        {
            this.Link = null;
            CreateDataBaseByConnectionStringsName(ConnectionStrings);
        }
        /// <summary>
        /// 创建数据库连接，传入配置文件字段名
        /// </summary>
        /// <param name="ConnectionStringsName">数据库配置字段</param>
        /// <returns></returns>
        private void CreateDataBaseByConnectionStringsName(string ConnectionStringsName)
        {
            MySqlConnection link = new MySqlConnection();
            string ConnectionStrings = ConfigurationManager.ConnectionStrings[ConnectionStringsName].ToString();
            link.ConnectionString = ConnectionStrings;
            try
            {
                link.Open();
                this.Link = link;
            }
            catch (Exception e) { throw new Exception(e.Message); }
        }
        public void CloseDataBase(System.Data.Common.DbConnection Link)
        {
            MySqlConnection Link_ = (MySqlConnection)Link;
            if (Link_ != null && Link_.State == ConnectionState.Open)
            {
                Link_.Close();
            }
        }

        public System.Data.Common.DbCommand GetSqlStringCommand(string query)
        {
            MySqlCommand cmd = null;
            if (Link != null && query != "")
                cmd = new MySqlCommand(query, Link);
            return cmd;
        }

        public void AddInParameter(System.Data.Common.DbCommand cmd, string ParmsName, System.Data.DbType ParmsType_, object value)
        {
            try
            {
                MySqlDbType ParmsType = BuildDbType(ParmsType_.ToString());
                MySqlParameter parameter = new MySqlParameter(ParmsName, ParmsType);
                parameter.Direction = ParameterDirection.Input;
                if (value == null)
                    parameter.Value = DBNull.Value;
                else
                    parameter.Value = value;
                cmd.Parameters.Add(parameter);
            }
            catch (Exception e) { throw new Exception(e.Message); }
        }

        public System.Data.DataSet ExecuteDataSet(System.Data.Common.DbCommand cmd_)
        {
            DataSet ds = null;
            MySqlCommand cmd = cmd_ as MySqlCommand;
            try
            {
                MySqlDataAdapter adapter = new MySqlDataAdapter(cmd);
                ds = new DataSet();
                adapter.Fill(ds);
                cmd.Parameters.Clear();
            }
            catch (Exception e) { throw new Exception(e.Message); }
            return ds;
        }

        public int ExecuteNonQuery(System.Data.Common.DbCommand cmd)
        {
            int returnCount = ;
            try
            {
                returnCount = cmd.ExecuteNonQuery();
            }
            catch (Exception e) { throw new Exception(e.Message); }
            return returnCount;
        }
        /// <summary>
        /// 创建 DbType 类型
        /// </summary>
        /// <param name="t">System数据类型</param>
        /// <returns></returns>
        private MySqlDbType BuildDbType(string t)
        {
            switch (t)
            {
                case "Byte":
                    return MySqlDbType.Byte;
                case "Byte[]":
                    return MySqlDbType.Binary;
                case "Int32":
                    return MySqlDbType.Int32;
                case "Int64":
                    return MySqlDbType.Int64;
                case "UInt16":
                    return MySqlDbType.UInt16;
                case "UInt32":
                    return MySqlDbType.UInt32;
                case "UInt64":
                    return MySqlDbType.UInt64;
                case "Decimal":
                    return MySqlDbType.Decimal;
                case "Double":
                    return MySqlDbType.Double;
                //case "Guid":
                //    return MySqlDbType.Guid;
                //case "Xml":
                //    return MySqlDbType.Xml;
                case "Object":
                    return MySqlDbType.Binary;
                case "Boolean":
                    return MySqlDbType.Bit;
                case "String":
                    return MySqlDbType.String;
                case "DateTime":
                    return MySqlDbType.DateTime;
                default:
                    return MySqlDbType.String;
            }
        }
    }//end

4.sqlserver  实现接口

public class sqlserver : IDataBase
    {
         internal SqlConnection Link;
        public sqlserver()
        {

        }
        public sqlserver(string ConnectionStrings)
        {
            this.Link = null;
            CreateDataBaseByConnectionStringsName(ConnectionStrings);
        }
        /// <summary>
        /// 创建数据库连接，传入配置文件字段名
        /// </summary>
        /// <param name="ConnectionStringsName">数据库配置字段</param>
        /// <returns></returns>
        private void CreateDataBaseByConnectionStringsName(string ConnectionStringsName)
        {
            SqlConnection link = new SqlConnection();
            string ConnectionStrings = ConfigurationManager.ConnectionStrings[ConnectionStringsName].ToString();
            link.ConnectionString = ConnectionStrings;
            try
            {
                link.Open();
                this.Link = link;
            }
            catch (Exception e) { throw new Exception(e.Message); }
        }
        public void CloseDataBase(System.Data.Common.DbConnection Link)
        {
            SqlConnection Link_ = (SqlConnection)Link;
            if (Link_ != null && Link_.State == ConnectionState.Open)
            {
                Link_.Close();
            }
        }

        public System.Data.Common.DbCommand GetSqlStringCommand(string query)
        {
            SqlCommand cmd = null;
            if (Link != null && query != "")
                cmd = new SqlCommand(query, Link);
            return cmd;
        }

        public void AddInParameter(System.Data.Common.DbCommand cmd, string ParmsName, System.Data.DbType ParmsType, object value)
        {
            try
            {
                SqlParameter parameter = new SqlParameter(ParmsName, ParmsType);
                parameter.Direction = ParameterDirection.Input;
                if (value == null)
                    parameter.Value = DBNull.Value;
                else
                    parameter.Value = value;
                cmd.Parameters.Add(parameter);
            }
            catch (Exception e) { throw new Exception(e.Message); }
        }

        public System.Data.DataSet ExecuteDataSet(System.Data.Common.DbCommand cmd_)
        {
            DataSet ds = null;
            SqlCommand cmd = cmd_ as SqlCommand;
            try
            {
                SqlDataAdapter adapter = new SqlDataAdapter(cmd);
                ds = new DataSet();
                adapter.Fill(ds);
                cmd.Parameters.Clear();
            }
            catch (Exception e) { throw new Exception(e.Message); }
            return ds;
        }

        public int ExecuteNonQuery(System.Data.Common.DbCommand cmd)
        {
            int returnCount = ;
            try
            {
                returnCount = cmd.ExecuteNonQuery();
            }
            catch (Exception e) { throw new Exception(e.Message); }
            return returnCount;
        }
        /// <summary>
        /// 创建 DbType 类型
        /// </summary>
        /// <param name="t">System数据类型</param>
        /// <returns></returns>
        private DbType BuildDbType(Type t)
        {
            switch (t.Name)
            {
                case "Byte":
                    return DbType.Byte;
                case "Byte[]":
                    return DbType.Binary;
                case "Int32":
                    return DbType.Int32;
                case "Int64":
                    return DbType.Int64;
                case "UInt16":
                    return DbType.UInt16;
                case "UInt32":
                    return DbType.UInt32;
                case "UInt64":
                    return DbType.UInt64;
                case "Decimal":
                    return DbType.Decimal;
                case "Double":
                    return DbType.Double;
                case "Guid":
                    return DbType.Guid;
                case "Xml":
                    return DbType.Xml;
                case "Object":
                    return DbType.Binary;
                case "Boolean":
                    return DbType.Boolean;
                case "String":
                    return DbType.String;
                case "DateTime":
                    return DbType.DateTime;
                default:
                    return DbType.String;
            }
        }

        public void AddOutParameter(System.Data.Common.DbCommand cmd, string ParmsName, DbType ParmsType, object value)
        {
            try
            {
                SqlParameter parameter = new SqlParameter(ParmsName, ParmsType);
                parameter.Direction = ParameterDirection.Output;
                if (value == null)
                    parameter.Value = DBNull.Value;
                else
                    parameter.Value = value;
                cmd.Parameters.Add(parameter);
            }
            catch (Exception e) { throw new Exception(e.Message); }
        }

        public System.Data.Common.DbCommand GetStoredProcCommand(string ProcName)
        {
            SqlCommand cmd = null;
            if (Link != null && ProcName != "")
            {
                cmd = new SqlCommand(ProcName, Link);
                cmd.CommandType = CommandType.StoredProcedure;
            }
            return cmd;
        }

        public object GetParameterValueOrKeyValue(System.Data.Common.DbCommand cmd, string ParmsName = "")
        {
            Dictionary<string, object> dic = null;
            try
            {
                dic = new Dictionary<string, object>();
                foreach (SqlParameter parameter in cmd.Parameters)
                {
                    if (parameter.Direction == ParameterDirection.Output)
                    {
                        dic.Add(parameter.ParameterName, parameter.Value);
                    }
                }
                if (dic != null && dic.Count > )
                {
                    if (ParmsName != "" && dic.ContainsKey(ParmsName))
                        return dic[ParmsName];
                }
                else
                    dic = null;
            }
            catch (Exception e) { throw new Exception(e.Message); }
            return dic;
        }
    }//end

5.生成连接对象

 public class DataBase
    {
        public static DBFactory fac = new DBFactory();
        public static IDataBase MySql_idb = null;
        static DataBase()
        {
            MySql_idb = fac.Creatobject<IDataBase>("数据集", "数据集.MySQLHelper", new object[] { "配置名称" });
        }
    }//end

6.配置文件

<connectionStrings>

<add name="MysqlContext" connectionString="Data Source=localhost;port=3306;Initial Catalog=数据库名称;user id=root;password=123456;charset=gb2312;" providerName="MySql.Data.MySqlClient" />

<add name="SQLserverContext" providerName="System.Data.SqlClient" connectionString="Server=.;Database=数据库名称;User ID=sa;Password=123456;Trusted_Connection=false" />

 </connectionStrings>

7.实现例子

 public bool Add(string telString)
        {
            string sqlStr = @"insert into Table
(telString)
values
(@telString)";

            DbCommand cmd = MySql_idb.GetSqlStringCommand(sqlStr);
            MySql_idb.AddInParameter(cmd, "@telString", System.Data.DbType.String, telString);return MySql_idb.ExecuteNonQuery(cmd) > ;
        }

public static int execPro(int id, string name)
        {
            int result = ;
            DbCommand cmd = MySql_idb.GetStoredProcCommand("Proc_ceshi");
            MySql_idb.AddInParameter(cmd, "@id", System.Data.DbType.Int32, id);
            MySql_idb.AddInParameter(cmd, "@name", System.Data.DbType.String, name);
            MySql_idb.AddOutParameter(cmd, "@returnval", System.Data.DbType.Int32, result);
            MySql_idb.ExecuteNonQuery(cmd);
            result = Convert.ToInt32(MySql_idb.GetParameterValueOrKeyValue(cmd, "@returnval").ToString());
            return result;
        }