using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.OracleClient;
using System.Configuration;
using System.Data;
using System.Reflection;
using System.Web.Script.Serialization;
namespace DAL
{
public class OracleHelper
{
#region 变量
/// <summary>
/// 数据库连接对象
/// </summary>
private static OracleConnection _con = null;
public static string constr = ConfigurationManager.ConnectionStrings["CR_oracleStr"].ToString();
#endregion
#region 属性
/// <summary>
/// 获取或设置数据库连接对象
/// </summary>
public static OracleConnection Con
{
get
{
if (OracleHelper._con == null)
{
OracleHelper._con = new OracleConnection();
}
if (OracleHelper._con.ConnectionString == "")
{
OracleHelper._con.ConnectionString = OracleHelper.constr;
}
return OracleHelper._con;
}
set
{
OracleHelper._con = value;
}
}
#endregion
#region 方法
#region 执行返回一行一列的数据库操作
/// <summary>
/// 执行返回一行一列的数据库操作
/// </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>第一行第一列的记录</returns>
public static int ExecuteScalar(string commandText, CommandType commandType, params OracleParameter[] param)
{
int count = 0;
using (OracleHelper.Con)
{
using (OracleCommand cmd = new OracleCommand(commandText, OracleHelper.Con))
{
try
{
cmd.CommandType = commandType;
if (param!=null)
{
cmd.Parameters.AddRange(param);
}
OracleHelper.Con.Open();
count = Convert.ToInt32(cmd.ExecuteScalar());
}
catch (Exception ex)
{
count = 0;
}
}
}
return count;
}
#endregion
#region 执行不查询的数据库操作
/// <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 = 0;
using (OracleHelper.Con)
{
using (OracleCommand cmd = new OracleCommand(commandText, OracleHelper.Con))
{
try
{
cmd.CommandType = commandType;
if (param!=null)
{
cmd.Parameters.AddRange(param);
}
OracleHelper.Con.Open();
result = cmd.ExecuteNonQuery();
}
catch (Exception ex)
{
result = 0;
}
}
}
return result;
}
#endregion
#region 执行返回一条记录的泛型对象
/// <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(OracleHelper._assemblyName).CreateInstance(OracleHelper._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 = 0; 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)
{
if (val.GetType() == typeof(decimal) || val.GetType() == typeof(int))
{
propertyInfo.SetValue(obj, Convert.ToInt32(val), null);
}
else if (val.GetType() == typeof(DateTime))
{
propertyInfo.SetValue(obj, Convert.ToDateTime(val), null);
}
else if (val.GetType() == typeof(string))
{
propertyInfo.SetValue(obj, Convert.ToString(val), null);
}
}
break;
}
}
}
}
catch (Exception ex)
{
throw;
}
return obj;
}
#endregion
#region 执行返回一条记录的泛型对象
/// <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);
using (OracleHelper.Con)
{
using (OracleCommand cmd = new OracleCommand(commandText, OracleHelper.Con))
{
cmd.CommandType = commandType;
cmd.Parameters.AddRange(param);
OracleHelper.Con.Open();
OracleDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
while (reader.Read())
{
obj = OracleHelper.ExecuteDataReader<T>(reader);
}
}
}
return obj;
}
#endregion
#region 执行返回多条记录的泛型集合对象
/// <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>();
using (OracleHelper.Con)
{
using (OracleCommand cmd = new OracleCommand(commandText, OracleHelper.Con))
{
try
{
cmd.CommandType = commandType;
if (param != null)
{
cmd.Parameters.AddRange(param);
}
OracleHelper.Con.Open();
OracleDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
while (reader.Read())
{
T obj = OracleHelper.ExecuteDataReader<T>(reader);
list.Add(obj);
}
}
catch (Exception ex)
{
list = null;
}
}
}
return list;
}
#endregion
#endregion
}
}
时间： 2024-08-10 15:11:56