.net C# SqlHelper for Oracle

适用于Oracle的sqlhelper

需要使用ODP.Net，引用Oracle.DataAccess.dll　　推荐安装ODAC

代码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Reflection;
using System.Data;
using System.Configuration;
using Oracle.DataAccess.Client;

namespace DAL
{
    public static class SqlHelper
    {
        #region 样本
        //标准连接-SSPI
        private static readonly string defaultConnectString = "Data Source=ORCL;Integrated Security=SSPI;";
        //标准连接
        //private static readonly string defaultConnectString = "Data Source=ORCL;User Id=UPDM;Password=1234;";
        //标准链接
        //private static readonly string defaultConnectString = "Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521)))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=orcl)));User Id=system;Password=1234;";
        #endregion
        #region 变量

        private static OracleConnection _con = null;
        public static string _constr = ConfigurationManager.ConnectionStrings["orcl"].ToString();

        #endregion  

        #region 属性  

        public static string constr
        {
            get
            {
                if (_constr == null||_constr.Equals(String.Empty))
                {
                    _constr = defaultConnectString;
                }
                return _constr;
            }
            set
            {
                _constr = value;
            }
        }

        /// <summary>
        /// 获取或设置数据库连接对象
        /// </summary>
        public static OracleConnection Con
        {
            get
            {

                if (SqlHelper._con == null)
                {
                    SqlHelper._con = new OracleConnection();
                }
                if (SqlHelper._con.ConnectionString == null || SqlHelper._con.ConnectionString.Equals(string.Empty))
                {
                    SqlHelper._con.ConnectionString = SqlHelper.constr;
                }
                return SqlHelper._con;
            }
            set
            {
                SqlHelper._con = value;
            }
        }
        #endregion  

        #region 方法  

        /// <summary>
        /// 执行并返回第一行第一列的数据库操作
        /// </summary>
        /// <param name="commandText">Sql语句或存储过程名</param>
        /// <param name="commandType">Sql命令类型</param>
        /// <param name="param">Oracle命令参数数组</param>
        /// <returns>第一行第一列的记录</returns>
        public static int ExecuteScalar(string commandText, CommandType commandType, params OracleParameter[] param)
        {
            int result = ;
            try{
                using (OracleCommand cmd = new OracleCommand(commandText, SqlHelper.Con))
                {
                    try
                    {
                        cmd.CommandType = commandType;
                        if (param!=null)
                        {
                            cmd.Parameters.AddRange(param);
                        }
                        SqlHelper.Con.Open();
                        string x = cmd.CommandText;
                        result = Convert.ToInt32(cmd.ExecuteScalar());
                    }
                    catch
                    {
                        result = -;
                    }
                }
            }
            finally
            {
                if (SqlHelper.Con.State != ConnectionState.Closed)
                {
                    SqlHelper.Con.Close();
                }
            }
            return result;
        }

        /// <summary>
        /// 执行不查询的数据库操作
        /// </summary>
        /// <param name="commandText">Oracle语句或存储过程名</param>
        /// <param name="commandType">Oracle命令类型</param>
        /// <param name="param">Oracle命令参数数组</param>
        /// <returns>受影响的行数</returns>
        public static int ExecuteNonQuery(string commandText, CommandType commandType, params OracleParameter[] param)
        {
            int result = ;
            try
            {
                using (OracleCommand cmd = new OracleCommand(commandText, SqlHelper.Con))
                {
                    try
                    {
                        cmd.CommandType = commandType;
                        if (param!=null)
                        {
                            cmd.Parameters.AddRange(param);
                        }
                        SqlHelper.Con.Open();
                        result = cmd.ExecuteNonQuery();
                    }
                    catch
                    {
                        result = -;
                    }
                }
            }
            finally
            {
                if (SqlHelper.Con.State != ConnectionState.Closed)
                {
                    SqlHelper.Con.Close();
                }
            }
            return result;
        }

        /// <summary>
        /// 获取数据表
        /// </summary>
        /// <param name="commandText">select命令</param>
        /// <param name="param">参数表</param>
        /// <returns></returns>
        public static DataTable GetDataTable(string commandText,params OracleParameter[] param)
        {
            DataTable result = new DataTable();
            try
            {
                using (OracleCommand cmd = new OracleCommand(commandText, SqlHelper.Con))
                {
                    cmd.Parameters.AddRange(param);
                    try {
                        OracleDataAdapter adapter = new OracleDataAdapter(cmd);
                        adapter.Fill(result);
                    }
                    catch
                    {
                        result = null;
                    }
                }
            }
            finally
            {
                if (SqlHelper.Con.State != ConnectionState.Closed)
                {
                    SqlHelper.Con.Close();
                }
            }
            return result;
        }

        public static int GetNextValueInSequence(string sequenceName)
        {
            if (ExecuteScalar("select count(*) from user_objects where OBJECT_NAME=:seqName", CommandType.Text, new OracleParameter(":seqName",sequenceName)) > )
            {
                return ExecuteScalar("select " + sequenceName + ".nextval from dual", CommandType.Text);
            }
            else
            {
                return -;
            }

        }

        /// <summary>
        /// 事务模式执行多行非查询语句
        /// </summary>
        /// <param name="commandText">sql语句</param>
        /// <param name="param">参数</param>
        /// <returns>受影响行数</returns>
        public static int ExecuteNonQueryTransaction(string commandText, List<OracleParameter[]> param)
        {
            int result = ;
            try
            {
                using (OracleCommand cmd = new OracleCommand(commandText, SqlHelper.Con))
                {
                    SqlHelper.Con.Open();
                    cmd.Transaction = cmd.Connection.BeginTransaction();
                    try
                    {
                        foreach (OracleParameter[] par in param)
                        {
                            cmd.Parameters.Clear();
                            cmd.Parameters.AddRange(par);
                            result += cmd.ExecuteNonQuery();
                        }
                        cmd.Transaction.Commit();
                    }
                    catch
                    {
                        result = -;
                        try
                        {
                            cmd.Transaction.Rollback();
                        }
                        catch
                        {
                            result = -;
                        }
                    }
                }
            }
            finally
            {
                if (SqlHelper.Con.State != ConnectionState.Closed)
                {
                    SqlHelper.Con.Close();
                }
            }
            return result;
        }

        /// <summary>
        /// 执行返回一条记录的泛型对象
        /// </summary>
        /// <typeparam name="T">泛型类型</typeparam>
        /// <param name="reader">只进只读对象</param>
        /// <returns>泛型对象</returns>
        private static T ExecuteDataReader<T>(IDataReader reader)
        {
            T obj = default(T);
            try
            {
                Type type = typeof(T);
                obj = (T)Activator.CreateInstance(type);//从当前程序集里面通过反射的方式创建指定类型的对象
                //obj = (T)Assembly.Load(SqlHelper._assemblyName).CreateInstance(SqlHelper._assemblyName + "." + type.Name);//从另一个程序集里面通过反射的方式创建指定类型的对象
                PropertyInfo[] propertyInfos = type.GetProperties();//获取指定类型里面的所有属性
                foreach (PropertyInfo propertyInfo in propertyInfos)
                {
                    for (int i = ; i < reader.FieldCount; i++)
                    {
                        string fieldName = reader.GetName(i);
                        if (fieldName.ToLower() == propertyInfo.Name.ToLower())
                        {
                            object val = reader[propertyInfo.Name];//读取表中某一条记录里面的某一列
                            if (val != null && val != DBNull.Value)
                            {
                                Type valType = val.GetType();

                                if (valType == typeof(float) || valType == typeof(double) || valType== typeof(decimal))
                                {
                                    propertyInfo.SetValue(obj, Convert.ToDouble(val), null);
                                }
                                else if (valType == typeof(int))
                                {
                                    propertyInfo.SetValue(obj, Convert.ToInt32(val), null);
                                }
                                else if (valType == typeof(DateTime))
                                {
                                    propertyInfo.SetValue(obj, Convert.ToDateTime(val), null);
                                }
                                else if (valType == typeof(string))
                                {
                                    propertyInfo.SetValue(obj, Convert.ToString(val), null);
                                }
                            }
                            break;
                        }
                    }
                }
            }
            catch
            {
                throw;
            }
            return obj;
        }  

        /// <summary>
        /// 执行返回一条记录的泛型对象
        /// </summary>
        /// <typeparam name="T">泛型类型</typeparam>
        /// <param name="commandText">Oracle语句或存储过程名</param>
        /// <param name="commandType">Oracle命令类型</param>
        /// <param name="param">Oracle命令参数数组</param>
        /// <returns>实体对象</returns>
        public static T ExecuteEntity<T>(string commandText, CommandType commandType, params OracleParameter[] param)
        {
            T obj = default(T);
            try
            {
                using (OracleCommand cmd = new OracleCommand(commandText, SqlHelper.Con))
                {
                    cmd.CommandType = commandType;
                    cmd.Parameters.AddRange(param);
                    SqlHelper.Con.Open();
                    OracleDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                    while (reader.Read())
                    {
                        obj = SqlHelper.ExecuteDataReader<T>(reader);
                    }
                }
            }
            finally
            {
                if (SqlHelper.Con.State != ConnectionState.Closed)
                {
                    SqlHelper.Con.Close();
                }
            }
            return obj;
        }  

        /// <summary>
        /// 执行返回多条记录的泛型集合对象
        /// </summary>
        /// <typeparam name="T">泛型类型</typeparam>
        /// <param name="commandText">Oracle语句或存储过程名</param>
        /// <param name="commandType">Oracle命令类型</param>
        /// <param name="param">Oracle命令参数数组</param>
        /// <returns>泛型集合对象</returns>
        public static List<T> ExecuteList<T>(string commandText, CommandType commandType, params OracleParameter[] param)
        {
            List<T> list = new List<T>();
            try
            {
                using (OracleCommand cmd = new OracleCommand(commandText, SqlHelper.Con))
                {
                    try
                    {
                        cmd.CommandType = commandType;

                        if (param != null)
                        {
                            cmd.Parameters.AddRange(param);
                        }
                        SqlHelper.Con.Open();  

                        OracleDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);  

                        while (reader.Read())
                        {
                            T obj = SqlHelper.ExecuteDataReader<T>(reader);
                            list.Add(obj);
                        }
                    }
                    catch (Exception ex)
                    {
                        list = null;
                    }
                }
            }
            finally
            {
                if (SqlHelper.Con.State != ConnectionState.Closed)
                {
                    SqlHelper.Con.Close();
                }
            }
            return list;
        }

        #endregion
    }
}