c#(数据库操作的类)

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  1 using System;
  2 using System.Collections.Generic;
  3 using System.Text;
  4 using System.Data;
  5 using System.Data.SqlClient;
  6 
  7 namespace GoodsDAL
  8 {
  9     /// <summary>
 10     /// 对数据库操作的类
 11     /// </summary>
 12     public class SQLHelper
 13     {
 14         /// <summary>
 15         /// 数据库连接函数
 16         /// </summary>
 17         public SqlConnection getConnection(Boolean isClose)
 18         {
 19             String conString = "Data Source = .; Initial Catalog = goods; User id = sa; password = sa";
 20             SqlConnection con = new SqlConnection(conString);
 21             if (isClose)
 22             {
 23                 con.Open();
 24             }
 25             else
 26             {
 27                 con.Close();
 28             }
 29             return con;
 30         }
 31 
 32         /// <summary>
 33         /// 执行查询语句
 34         /// </summary>
 35         /// <param name="cmdText"></param>
 36         /// <param name="cmdType"></param>
 37         /// <param name="par"></param>
 38         /// <returns>第一行第一列的值</returns>
 39         public object exeScalar(string cmdText, CommandType cmdType, params SqlParameter[] par)
 40         {
 41             SqlCommand cmd = new SqlCommand(cmdText, getConnection(true));
 42             cmd.CommandType = cmdType;
 43             if (par != null)
 44             {
 45                 foreach (SqlParameter p in par)
 46                 {
 47                     cmd.Parameters.Add(p);
 48                 }
 49             }
 50             object result = Convert.ToInt32(cmd.ExecuteScalar());
 51             getConnection(false);
 52             return result;
 53         }
 54 
 55         /// <summary>
 56         /// 执行更新语句 
 57         /// </summary>
 58         /// <param name="cmdText"></param>
 59         /// <param name="cmdType"></param>
 60         /// <param name="par"></param>
 61         /// <returns>受影响的行数</returns>
 62         public int exeNonQuery(string cmdText, CommandType cmdType, params SqlParameter[] par)
 63         {
 64             SqlCommand cmd = new SqlCommand(cmdText, getConnection(true));
 65             cmd.CommandType = cmdType;
 66             if (par != null)
 67             {
 68                 foreach (SqlParameter p in par)
 69                 {
 70                     cmd.Parameters.Add(p);
 71                 }
 72             }
 73             int result = cmd.ExecuteNonQuery();
 74             getConnection(false);
 75             return result;
 76         }
 77 
 78         /// <summary>
 79         /// 读取数据库中的数据
 80         /// </summary>
 81         /// <param name="cmdText"></param>
 82         /// <param name="cmdType"></param>
 83         /// <param name="par"></param>
 84         /// <returns>SqlDataReader</returns>
 85         public SqlDataReader exeDataReader(string cmdText, CommandType cmdType, params SqlParameter[] par)
 86         {
 87             SqlCommand cmd = new SqlCommand(cmdText, getConnection(true));
 88             cmd.CommandType = cmdType;
 89             if (par != null)
 90             {
 91                 foreach (SqlParameter p in par)
 92                 {
 93                     cmd.Parameters.Add(p);
 94                 }
 95             }
 96             SqlDataReader dataReader = cmd.ExecuteReader();
 97             getConnection(false);
 98             return dataReader;
 99         }
100 
101         /// <summary>
102         /// 获取数据库表集合
103         /// </summary>
104         /// <param name="cmdText"></param>
105         /// <param name="cmdType"></param>
106         /// <param name="par"></param>
107         /// <returns>DataSet集</returns>
108         public DataSet exeGetDataSet(string cmdText, CommandType cmdType, params SqlParameter[] par)
109         {
110             DataSet ds = new DataSet();
111             SqlCommand cmd = new SqlCommand(cmdText, getConnection(true));
112             cmd.CommandType = cmdType;
113             if (par != null)
114             {
115                 foreach (SqlParameter p in par)
116                 {
117                     cmd.Parameters.Add(p);
118                 }
119             }
120             SqlDataAdapter dataAdapter = new SqlDataAdapter(cmd);
121             dataAdapter.Fill(ds);
122             return ds;
123         }
124     }
125 }

posted on 2012-08-12 11:01  lovebeauty  阅读(325)  评论(1)  编辑  收藏  举报

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