学步园

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.Common;
using System.Configuration;
using System.Collections;

namespace DBUtility
{
    public class DataAccess
    {
        private string _confirString = "ConnectionString";
        public DataAccess()
        {
        }

        /// <param name="configString">app.config 关键字</param>
        public DataAccess(string configString)
        {
            ConfigString = configString;
        }

        /// <summary>
        /// 属性,设置数据库连接字符串
        /// </summary>
        public string ConfigString
        {
            get
            {
                return _confirString;
            }
            set
            {
                _confirString = value;
            }
        }

        //===========================================GetProviderName=============================

        #region 获得数据库的类型public string GetProviderName(string ConfigString)
        /// <summary>
        /// 返回数据提供者
        /// </summary>
        /// <returns>返回数据提供者</returns>
        public string GetProviderName(string ConfigString)
        {

            ConnectionStringSettingsCollection ConfigStringCollention = ConfigurationManager.ConnectionStrings;
            if (ConfigStringCollention == null || ConfigStringCollention.Count <= 0)
            {
                throw new Exception("app.config 中无连接字符串!");
            }
            ConnectionStringSettings StringSettings = null;
            if (ConfigString == string.Empty)
            {
                StringSettings = ConfigurationManager.ConnectionStrings["ConnectionString"];
            }
            else
            {
                StringSettings = ConfigurationManager.ConnectionStrings[ConfigString];
            }
            return StringSettings.ProviderName;
        }
        /// <summary>
        /// 返回数据提供者
        /// </summary>
        /// <returns></returns>
        public string GetProviderName()
        {
            return GetProviderName(ConfigString);
        }
        #endregion

        //===========================================获得连接字符串==============================

        #region 获得连接字符串

        /// <summary>
        /// 获得连接字符串
        /// </summary>
        /// <returns></returns>
        private string GetConnectionString(string ConfigString)
        {
            ConnectionStringSettingsCollection ConfigStringCollention = ConfigurationManager.ConnectionStrings;
            if (ConfigStringCollention == null || ConfigStringCollention.Count <= 0)
            {
                throw new Exception("app.config 中无连接字符串!");
            }
            ConnectionStringSettings StringSettings = null;
            if (ConfigString == string.Empty)
            {
                StringSettings = ConfigurationManager.ConnectionStrings["ConnectionString"];
            }
            else
            {
                StringSettings = ConfigurationManager.ConnectionStrings[ConfigString];
            }
            return StringSettings.ConnectionString;

        }
        private string GetConnectionString()
        {
            return GetConnectionString(ConfigString);
        }

        #endregion

        //===========================================GetDbproviderFactory========================

        #region 返回数据工厂  public DbProviderFactory GetDbProviderFactory()
        /// <summary>
        /// 返回数据工厂
        /// </summary>
        /// <returns></returns>
        private DbProviderFactory GetDbProviderFactory()
        {
            DbProviderFactory f = null;
            string ProviderName = GetProviderName();
            switch (ProviderName)
            {
                case "System.Data.SqlClient":
                    f = GetDbProviderFactory("System.Data.SqlClient");
                    break;
                case "System.Data.OracleClient":
                    f = GetDbProviderFactory("System.Data.OracleClient");
                    break;
                case "System.Data.OleDb":
                    f = GetDbProviderFactory("System.Data.OleDb");
                    break;
                default:
                    f = GetDbProviderFactory("System.Data.SqlClient");
                    break;
            }
            return f;
        }

        /// <summary>
        /// 返回数据工厂
        /// </summary>
        /// <param name="providername"></param>
        /// <returns></returns>
        private DbProviderFactory GetDbProviderFactory(string providername)
        {
            return DbProviderFactories.GetFactory(providername);
        }
        #endregion

        //===========================================CreateConnection============================

        #region 创建数据库连接 public DbConnection CreateConnection()
        /// <summary>
        /// 创建数据库连接
        /// </summary>
        /// <returns></returns>
        private DbConnection CreateConnection()
        {
            DbConnection con = GetDbProviderFactory().CreateConnection();
            con.ConnectionString = GetConnectionString();

            return con;
        }
        /// <summary>
        /// 创建数据库连接
        /// </summary>
        /// <param name="provdername"></param>
        /// <returns></returns>
        private DbConnection CreateConnection(string provdername)
        {
            DbConnection con = GetDbProviderFactory(provdername).CreateConnection();
            con.ConnectionString = GetConnectionString();

            return con;

        }
        #endregion

        //===========================================CreateCommand===============================

        #region 创建执行命令对象 public override DbCommand CreateCommand(string sql, CommandType cmdType, DbParameter[] parameters)
        /// <summary>
        /// 创建执行命令对象
        /// </summary>
        /// <param name="sql"></param>
        /// <param name="cmdType"></param>
        /// <param name="parameters"></param>
        /// <returns></returns>
        private DbCommand CreateCommand(string sql, CommandType cmdType, DbParameter[] parameters)
        {
            DbCommand _command = GetDbProviderFactory().CreateCommand();
            _command.Connection = CreateConnection();
            _command.CommandText = sql;
            _command.CommandType = cmdType;
            if (parameters != null && parameters.Length > 0)
            {
                foreach (DbParameter param in parameters)
                {
                    _command.Parameters.Add(param);
                }
            }
            return _command;
        }

        /// <summary>
        /// 创建执行命令对象
        /// </summary>
        /// <param name="sql">SQL语句</param>
        /// <returns>执行命令对象实例</returns>
        private DbCommand CreateCommand(string sql)
        {
            DbParameter[] parameters = new DbParameter[0];
            return CreateCommand(sql, CommandType.Text, parameters);
        }
        /// <summary>
        /// 创建执行命令对象
        /// </summary>
        /// <param name="sql">SQL语句</param>
        /// <returns>执行命令对象实例</returns>
        private DbCommand CreateCommand(string sql, CommandType cmdtype)
        {
            DbParameter[] parameters = new DbParameter[0];
            return CreateCommand(sql, cmdtype, parameters);
        }
        /// <summary>
        /// 创建执行命令对象
        /// </summary>
        /// <param name="sql">ＳＱＬ语句</param>
        /// <param name="parameters">参数</param>
        /// <returns>执行命令对象实例</returns>
        private DbCommand CreateCommand(string sql, DbParameter[] parameters)
        {
            return CreateCommand(sql, CommandType.Text, parameters);
        }
        #endregion

        //===========================================CreateAdapter()=============================

        #region 创建数据适配器 CreateAdapter(string sql)
        /// <summary>
        /// 创建数据适配器
        /// </summary>
        /// <param name="sql">SQL,语句</param>
        /// <returns>数据适配器实例</returns>
        private DbDataAdapter CreateAdapter(string sql)
        {
            DbParameter[] parameters = new DbParameter[0];
            return CreateAdapter(sql, CommandType.Text, parameters);
        }

        /// <summary>
        /// 创建数据适配器
        /// </summary>
        /// <param name="sql">SQL语句</param>
        /// <param name="cmdtype">命令类型</param>
        /// <returns>数据适配器实例</returns>
        private DbDataAdapter CreateAdapter(string sql, CommandType cmdtype)
        {
            DbParameter[] parameters = new DbParameter[0];
            return CreateAdapter(sql, cmdtype, parameters);
        }
        /// <summary>
        /// 创建数据适配器
        /// </summary>
        /// <param name="connectionString">数据库连接字符串</param>
        /// <param name="sql">SQL语句</param>
        /// <param name="cmdtype">命令类型</param>
        /// <param name="parameters">参数</param>
        /// <returns>数据适配器实例</returns>
        private DbDataAdapter CreateAdapter(string sql, CommandType cmdtype, DbParameter[] parameters)
        {
            DbConnection _connection = CreateConnection();
            DbCommand _command = GetDbProviderFactory().CreateCommand();
            _command.Connection = _connection;
            _command.CommandText = sql;
            _command.CommandType = cmdtype;
            if (parameters != null && parameters.Length > 0)
            {
                foreach (DbParameter _param in parameters)
                {
                    _command.Parameters.Add(_param);
                }
            }
            DbDataAdapter da = GetDbProviderFactory().CreateDataAdapter();
            da.SelectCommand = _command;

            return da;
        }

        #endregion

        //===========================================CreateParameter=============================

        #region 生成参数 public override SqlParameter CreateParameter(string field, string dbtype, string value)
        /// <summary>
        /// 创建参数
        /// </summary>
        /// <param name="field">参数字段</param>
        /// <param name="dbtype">参数类型</param>
        /// <param name="value">参数值</param>
        /// <returns></returns>
        private DbParameter CreateParameter(string field, string dbtype, string value)
        {
            DbParameter p = GetDbProviderFactory().CreateParameter();
            p.ParameterName = field;
            p.Value = value;
            return p;
        }
        #endregion

        //===========================================ExecuteCommand()============================

        #region 执行非查询语句,并返回受影响的记录行数 ExecuteCommand(string sql)
        /// <summary>
        /// 执行非查询语句,并返回受影响的记录行数
        /// </summary>
        /// <param name="sql">SQL语句</param>
        /// <returns>受影响记录行数</returns>
        public int ExecuteCommand(string sql)
        {
            DbParameter[] parameters = new DbParameter[0];
            return ExecuteCommand(sql, CommandType.Text, parameters);
        }

        /// <summary>
        /// 执行非查询语句,并返回受影响的记录行数
        /// </summary>
        /// <param name="sql">SQL语句</param>
        /// <param name="cmdtype">命令类型</param>
        /// <returns>受影响记录行数</returns>
        public int ExecuteCommand(string sql, CommandType cmdtype)
        {
            DbParameter[] parameters = new DbParameter[0];
            return ExecuteCommand(sql, CommandType.Text, parameters);
        }

        /// <summary>
        /// 执行非查询语句,并返回受影响的记录行数
        /// </summary>
        /// <param name="sql">SQL语句</param>
        /// <param name="parameters">参数</param>
        /// <returns>受影响记录行数</returns>
        public int ExecuteCommand(string sql, DbParameter[] parameters)
        {
            return ExecuteCommand(sql, CommandType.Text, parameters);
        }

        /// <summary>
        ///批量执行SQL语句 
        /// </summary>
        /// <param name="SqlList">SQL列表</param>
        /// <returns></returns>
        public bool ExecuteCommand(ArrayList SqlList)
        {
            DbConnection con = CreateConnection();
            con.Open();
            bool iserror = false;
            string strerror = "";
            DbTransaction SqlTran = con.BeginTransaction();
            try
            {
                for (int i = 0; i < SqlList.Count; i++)
                {

                    DbCommand _command = GetDbProviderFactory().CreateCommand();
                    _command.Connection = con;
                    _command.CommandText = SqlList[i].ToString();
                    _command.Transaction = SqlTran;
                    _command.ExecuteNonQuery();
                }

            }
            catch (Exception ex)
            {
                iserror = true;
                strerror = ex.Message;

            }
            finally
            {

                if (iserror)
                {
                    SqlTran.Rollback();
                    throw new Exception(strerror);
                }
                else
                {
                    SqlTran.Commit();
                }
                con.Close();
            }
            if (iserror)
            {
                return false;
            }
            else
            {
                return true;
            }
        }

        /// <summary>
        /// 执行非查询语句,并返回受影响的记录行数
        /// </summary>
        /// <param name="sql">SQL语句</param>
        /// <param name="cmdtype">命令类型</param>
        /// <param name="parameters">参数</param>
        /// <returns>受影响记录行数</returns>
        public int ExecuteCommand(string sql, CommandType cmdtype, DbParameter[] parameters)
        {
            int _result = 0;
            DbCommand _command = CreateCommand(sql, cmdtype, parameters);
            try
            {
                _command.Connection.Open();
                _result = _command.ExecuteNonQuery();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
            finally
            {
                _command.Connection.Close();
            }
            return _result;
        }

        #endregion

        //===========================================ExecuteScalar()=============================

        #region 执行非查询语句,并返回首行首列的值 ExecuteScalar(string sql)

        /// <summary>
        /// 执行非查询语句,并返回首行首列的值
        /// </summary>
        /// <param name="sql">SQL语句</param>
        /// <returns>Object</returns>
        public object ExecuteScalar(string sql)
        {
            DbParameter[] parameters = new DbParameter[0];
            return ExecuteScalar(sql, CommandType.Text, parameters);
        }

        /// <summary>
        /// 执行非查询语句,并返回首行首列的值
        /// </summary>
        /// <param name="sql">SQL语句</param>
        /// <param name="cmdtype">命令类型</param>
        /// <returns>Object</returns>
        public object ExecuteScalar(string sql, CommandType cmdtype)
        {
            DbParameter[] parameters =