SqlHelper:带sqlParameter，对sql server增、册、查、改的公用方法

SqlHelper:带sqlParameter，对sql server增、册、查、改的公用方法2011-10-13 14:58:54     我来说两句       收藏     我要投稿using System.Data; using System.Data.SqlCient;          #region ###jonse         //共通函数 把sql语句执行的查询结果放入datatable中         // 传入sql语句，datatable名称，数据连接字符可选         public static DataTable GetDataTable(out string sEx, string sSql, string sDataTableName, string sConnStr = "", SqlParameter[] commandParameters = null)         {             sEx = string.Empty;             if (string.IsNullOrEmpty(sDataTableName))             {                 sEx = "datatable的名字不能为空";                 return null;             }             if (string.IsNullOrEmpty(sConnStr)) sConnStr = DbHelperSQL.connectionString;             DataTable dt = new DataTable();              try             {                 if (commandParameters == null)                 {                     dt = ExecuteDataTable(sConnStr, CommandType.Text, sSql);                 }                 else                 {                     dt = ExecuteDataTable(sConnStr, CommandType.StoredProcedure, sSql, commandParameters);                 }             }             catch (Exception ex)             {                 sEx = ex.Message.ToString();             }             finally             {                 dt.TableName = sDataTableName;             }              return dt;         }          // 取dataset           public static DataSet GetDataSet(out string sError, string sSQL, string sConnStr="")          {              DataSet ds = null;              sError = string.Empty;              try              {                 if (string.IsNullOrEmpty(sConnStr)) sConnStr = DbHelperSQL.connectionString;                  SqlConnection conn = new SqlConnection(sConnStr);                  SqlCommand comm = new SqlCommand();                  comm.Connection = conn;                  comm.CommandText = sSQL;                  SqlDataAdapter dapter = new SqlDataAdapter(comm);                  ds = new DataSet();                  dapter.Fill(ds);              }              catch (Exception ex)              {                  sError = ex.Message;              }              return ds;          }            // 取某个单一的元素            public static object GetSingle(out string sError, string sSQL)         {             DataTable dt = GetDataTable(out sError, sSQL, "singleTbl");             if (dt != null && dt.Rows.Count > 0)             {                 return dt.Rows[0][0];             }              return null;         }          // 取最大的ID           public static Int32 GetMaxID(out string sError, string sKeyField, string sTableName)         {             DataTable dt = GetDataTable(out sError, "select isnull(max([" + sKeyField + "]),0) as MaxID from [" + sTableName + "]","maxID");             if (dt != null && dt.Rows.Count > 0)             {                 return Convert.ToInt32(dt.Rows[0][0].ToString());             }              return 0;         }           // 执行 insert,update,delete 动作，也可以使用事务           public static bool UpdateData(out string sError, string sSQL, SqlParameter[] sqlParams=null,bool bUseTransaction = false, string sConnStr = "")         {             int iResult = 0;             sError = string.Empty;             if (string.IsNullOrEmpty(sConnStr)) sConnStr = DbHelperSQL.connectionString;              if (!bUseTransaction)             {                 try                 {                     SqlConnection conn = new SqlConnection(sConnStr);                     if (conn.State != ConnectionState.Open)                         conn.Open();                     SqlCommand cmd = new SqlCommand();                     cmd.Connection = conn;                     cmd.CommandText = sSQL;                      if (sqlParams != null)                     {                         foreach (SqlParameter parm in sqlParams)                             cmd.Parameters.Add(parm);                     }                      iResult = cmd.ExecuteNonQuery();                 }                 catch (Exception ex)                 {                     sError = ex.Message;                     iResult = -1;                 }             }             else // 使用事务               {                 SqlTransaction trans = null;                 try                 {                     SqlConnection conn = new SqlConnection(sConnStr);                     if (conn.State != ConnectionState.Open)                         conn.Open();                     trans = conn.BeginTransaction();                     SqlCommand cmd = new SqlCommand();                     cmd.Connection = conn;                     cmd.CommandText = sSQL;                      if (sqlParams != null)                     {                         foreach (SqlParameter parm in sqlParams)                             cmd.Parameters.Add(parm);                     }                      cmd.Transaction = trans;                     iResult = cmd.ExecuteNonQuery();                     trans.Commit();                 }                 catch (Exception ex)                 {                     sError = ex.Message;                     iResult = -1;                     trans.Rollback();                 }             }              return iResult > 0;         }            #endregion ###jonse 提示：1，需要定义 DbHelperSQL.connectionString 变量     关于数据库连接字符串，一般有2种格式:             (1),Windows验证                           Common.ConnString = @"Initial Catalog=数据库名;Data Source=电脑名或IP地址;Integrated Security=SSPI";             (2), Sql混合验证                         Common.ConnString = @"server=电脑名或IP地址;database=数据库名;uid=用户名;password=密码";2, 具体调用例子，与下面的相似：http://www.2cto.com/database/201110/107655.html摘自：keenweiwei的专栏