SqlCommand.ExecuteReader()为何不能在执行存储过程时同时返回查询结果基和OutPut引用参数。

gasover 2003-08-22 10:41:27

注：command.ExecuteNonQuery()可以，SqlDataAdapter也可以，就是执行速度效率最高的SqlCommand.ExecuteReader()不能，
例如：一个简单的存储过程：用SqlCommand.ExecuteReader()执行；

Create PROCEDURE sp_test

@RecordCount int OUTPUT
AS
SET @RecordCount = 10
SELECT * FROM Products WHERE MainId = 2
这样执行后返回的参数(int) parameters[0].Value 没有返回值，记得为Null。多的代码就不贴出来了，我认为不是代码的问题

...全文

121 2 打赏收藏转发到动态举报

写回复

2 条回复

切换为时间正序

请发表友善的回复…

发表回复

wacle 2003-08-22

打赏
举报

回复

because datareader just read record from the result collection.
if you want to get the output parameter, at the end of your storeprocedure you must use "SELECT @RecordCount" and then you can use datareader to get the value like rd.getint(0).

basil 2003-08-22

打赏
举报

回复

就是
不行!!刚试过,不过好象executenonquery也不行啊!!

一款特别好用的.net数据库链接通用类。 using System; using System.Collections; using System.Collections.Specialized; using System.Data; using System.Data.SqlClient; using System.Configuration; using System.Data.Common; using System.Collections.Generic; namespace CMS.DBUtility { ///

/// 数据访问抽象基础类 /// Copyright (C) 2004-2008 By LiTianPing ///

public abstract class DbHelperSQL { //数据库连接字符串(web.config来配置)，可以动态更改connectionString支持多数据库. public static string connectionString = PubConstant.ConnectionString; public DbHelperSQL() { } #region 公用方法 ///

/// 判断是否存在某表的某个字段 ///

/// 表名称 /// 列名称 /// 是否存在 public static bool ColumnExists(string tableName, string columnName) { string sql = "select count(1) from syscolumns where [id]=object_id('" + tableName + "') and [name]='" + columnName + "'"; object res = GetSingle(sql); if (res == null) { return false; } return Convert.ToInt32(res) > 0; } public static int GetMaxID(string FieldName, string TableName) { string strsql = "select max(" + FieldName + ")+1 from " + TableName; object obj = GetSingle(strsql); if (obj == null) { return 1; } else { return int.Parse(obj.ToString()); } } public static bool Exists(string strSql) { object obj = GetSingle(strSql); int cmdresult; if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) { cmdresult = 0; } else { cmdresult = int.Parse(obj.ToString()); } if (cmdresult == 0) { return false; } else { return true; } } ///

/// 表是否存在 ///

/// /// public static bool TabExists(string TableName) { string strsql = "select count(*) from sysobjects where id = object_id(N'[" + TableName + "]') and OBJECTPROPERTY(id, N'IsUserTable') = 1"; //string strsql = "SELECT count(*) FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[" + TableName + "]') AND type in (N'U')"; object obj = GetSingle(strsql); int cmdresult; if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) { cmdresult = 0; } else { cmdresult = int.Parse(obj.ToString()); } if (cmdresult == 0) { return false; } else { return true; } } public static bool Exists(string strSql, params SqlParameter[] cmdParms) { object obj = GetSingle(strSql, cmdParms); int cmdresult; if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) { cmdresult = 0; } else { cmdresult = int.Parse(obj.ToString()); } if (cmdresult == 0) { return false; } else { return true; } } #endregion #region 执行简单SQL语句 ///

/// 执行SQL语句，返回影响的记录数 ///

/// SQL语句 /// 影响的记录数 public static int ExecuteSql(string SQLString) { using (SqlConnection connection = new SqlConnection(connectionString)) { using (SqlCommand cmd = new SqlCommand(SQLString, connection)) { try { connection.Open(); int rows = cmd.ExecuteNonQuery(); return rows; } catch (System.Data.SqlClient.SqlException e) { connection.Close(); throw e; } } } } public static int ExecuteSqlByTime(string SQLString, int Times) { using (SqlConnection connection = new SqlConnection(connectionString)) { using (SqlCommand cmd = new SqlCommand(SQLString, connection)) { try { connection.Open(); cmd.CommandTimeout = Times; int rows = cmd.ExecuteNonQuery(); return rows; } catch (System.Data.SqlClient.SqlException e) { connection.Close(); throw e; } } } } ///

/// 执行Sql和Oracle滴混合事务 ///

/// SQL命令行列表 /// Oracle命令行列表 /// 执行结果 0-由于SQL造成事务失败 -1 由于Oracle造成事务失败 1-整体事务执行成功 public static int ExecuteSqlTran(List list, List oracleCmdSqlList) { using (SqlConnection conn = new SqlConnection(connectionString)) { conn.Open(); SqlCommand cmd = new SqlCommand(); cmd.Connection = conn; SqlTransaction tx = conn.BeginTransaction(); cmd.Transaction = tx; try { foreach (CommandInfo myDE in list) { string cmdText = myDE.CommandText; SqlParameter[] cmdParms = (SqlParameter[])myDE.Parameters; PrepareCommand(cmd, conn, tx, cmdText, cmdParms); if (myDE.EffentNextType == EffentNextType.SolicitationEvent) { if (myDE.CommandText.ToLower().IndexOf("count(") == -1) { tx.Rollback(); throw new Exception("违背要求"+myDE.CommandText+"必须符合select count(..的格式"); //return 0; } object obj = cmd.ExecuteScalar(); bool isHave = false; if (obj == null && obj == DBNull.Value) { isHave = false; } isHave = Convert.ToInt32(obj) > 0; if (isHave) { //引发事件 myDE.OnSolicitationEvent(); } } if (myDE.EffentNextType == EffentNextType.WhenHaveContine || myDE.EffentNextType == EffentNextType.WhenNoHaveContine) { if (myDE.CommandText.ToLower().IndexOf("count(") == -1) { tx.Rollback(); throw new Exception("SQL:违背要求" + myDE.CommandText + "必须符合select count(..的格式"); //return 0; } object obj = cmd.ExecuteScalar(); bool isHave = false; if (obj == null && obj == DBNull.Value) { isHave = false; } isHave = Convert.ToInt32(obj) > 0; if (myDE.EffentNextType == EffentNextType.WhenHaveContine && !isHave) { tx.Rollback(); throw new Exception("SQL:违背要求" + myDE.CommandText + "返回值必须大于0"); //return 0; } if (myDE.EffentNextType == EffentNextType.WhenNoHaveContine && isHave) { tx.Rollback(); throw new Exception("SQL:违背要求" + myDE.CommandText + "返回值必须等于0"); //return 0; } continue; } int val = cmd.ExecuteNonQuery(); if (myDE.EffentNextType == EffentNextType.ExcuteEffectRows && val == 0) { tx.Rollback(); throw new Exception("SQL:违背要求" + myDE.CommandText + "必须有影响行"); //return 0; } cmd.Parameters.Clear(); } string oraConnectionString = PubConstant.GetConnectionString("ConnectionStringPPC"); bool res = OracleHelper.ExecuteSqlTran(oraConnectionString, oracleCmdSqlList); if (!res) { tx.Rollback(); throw new Exception("Oracle执行失败"); // return -1; } tx.Commit(); return 1; } catch (System.Data.SqlClient.SqlException e) { tx.Rollback(); throw e; } catch (Exception e) { tx.Rollback(); throw e; } } } ///

/// 执行多条SQL语句，实现数据库事务。 ///

/// 多条SQL语句 public static int ExecuteSqlTran(List SQLStringList) { using (SqlConnection conn = new SqlConnection(connectionString)) { conn.Open(); SqlCommand cmd = new SqlCommand(); cmd.Connection = conn; SqlTransaction tx = conn.BeginTransaction(); cmd.Transaction = tx; try { int count = 0; for (int n = 0; n < SQLStringList.Count; n++) { string strsql = SQLStringList[n]; if (strsql.Trim().Length > 1) { cmd.CommandText = strsql; count += cmd.ExecuteNonQuery(); } } tx.Commit(); return count; } catch { tx.Rollback(); return 0; } } } ///

/// 执行带一个存储过程参数的的SQL语句。 ///

/// SQL语句 /// 参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加 /// 影响的记录数 public static int ExecuteSql(string SQLString, string content) { using (SqlConnection connection = new SqlConnection(connectionString)) { SqlCommand cmd = new SqlCommand(SQLString, connection); System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@content", SqlDbType.NText); myParameter.Value = content; cmd.Parameters.Add(myParameter); try { connection.Open(); int rows = cmd.ExecuteNonQuery(); return rows; } catch (System.Data.SqlClient.SqlException e) { throw e; } finally { cmd.Dispose(); connection.Close(); } } } ///

/// 执行带一个存储过程参数的的SQL语句。 ///

/// SQL语句 /// 参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加 /// 影响的记录数 public static object ExecuteSqlGet(string SQLString, string content) { using (SqlConnection connection = new SqlConnection(connectionString)) { SqlCommand cmd = new SqlCommand(SQLString, connection); System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@content", SqlDbType.NText); myParameter.Value = content; cmd.Parameters.Add(myParameter); try { connection.Open(); object obj = cmd.ExecuteScalar(); if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) { return null; } else { return obj; } } catch (System.Data.SqlClient.SqlException e) { throw e; } finally { cmd.Dispose(); connection.Close(); } } } ///

/// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例) ///

/// SQL语句 /// 图像字节,数据库的字段类型为image的情况 /// 影响的记录数 public static int ExecuteSqlInsertImg(string strSQL, byte[] fs) { using (SqlConnection connection = new SqlConnection(connectionString)) { SqlCommand cmd = new SqlCommand(strSQL, connection); System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@fs", SqlDbType.Image); myParameter.Value = fs; cmd.Parameters.Add(myParameter); try { connection.Open(); int rows = cmd.ExecuteNonQuery(); return rows; } catch (System.Data.SqlClient.SqlException e) { throw e; } finally { cmd.Dispose(); connection.Close(); } } } ///

/// 执行一条计算查询结果语句，返回查询结果（object）。 ///

/// 计算查询结果语句 /// 查询结果（object） public static object GetSingle(string SQLString) { using (SqlConnection connection = new SqlConnection(connectionString)) { using (SqlCommand cmd = new SqlCommand(SQLString, connection)) { try { connection.Open(); object obj = cmd.ExecuteScalar(); if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) { return null; } else { return obj; } } catch (System.Data.SqlClient.SqlException e) { connection.Close(); throw e; } } } } public static object GetSingle(string SQLString, int Times) { using (SqlConnection connection = new SqlConnection(connectionString)) { using (SqlCommand cmd = new SqlCommand(SQLString, connection)) { try { connection.Open(); cmd.CommandTimeout = Times; object obj = cmd.ExecuteScalar(); if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) { return null; } else { return obj; } } catch (System.Data.SqlClient.SqlException e) { connection.Close(); throw e; } } } } ///

/// 执行查询语句，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close ) ///

/// 查询语句 /// SqlDataReader public static SqlDataReader ExecuteReader(string strSQL) { SqlConnection connection = new SqlConnection(connectionString); SqlCommand cmd = new SqlCommand(strSQL, connection); try { connection.Open(); SqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection); return myReader; } catch (System.Data.SqlClient.SqlException e) { throw e; } } ///

/// 执行查询语句，返回DataSet ///

/// 查询语句 /// DataSet public static DataSet Query(string SQLString) { using (SqlConnection connection = new SqlConnection(connectionString)) { DataSet ds = new DataSet(); try { connection.Open(); SqlDataAdapter command = new SqlDataAdapter(SQLString, connection); command.Fill(ds, "ds"); } catch (System.Data.SqlClient.SqlException ex) { throw new Exception(ex.Message); } return ds; } } public static DataSet Query(string SQLString, int Times) { using (SqlConnection connection = new SqlConnection(connectionString)) { DataSet ds = new DataSet(); try { connection.Open(); SqlDataAdapter command = new SqlDataAdapter(SQLString, connection); command.SelectCommand.CommandTimeout = Times; command.Fill(ds, "ds"); } catch (System.Data.SqlClient.SqlException ex) { throw new Exception(ex.Message); } return ds; } } #endregion #region 执行带参数的SQL语句 ///

/// 执行SQL语句，返回影响的记录数 ///

/// SQL语句 /// 影响的记录数 public static int ExecuteSql(string SQLString, params SqlParameter[] cmdParms) { using (SqlConnection connection = new SqlConnection(connectionString)) { using (SqlCommand cmd = new SqlCommand()) { try { PrepareCommand(cmd, connection, null, SQLString, cmdParms); int rows = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); return rows; } catch (System.Data.SqlClient.SqlException e) { throw e; } } } } ///

/// 执行多条SQL语句，实现数据库事务。 ///

/// SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]） public static void ExecuteSqlTran(Hashtable SQLStringList) { using (SqlConnection conn = new SqlConnection(connectionString)) { conn.Open(); using (SqlTransaction trans = conn.BeginTransaction()) { SqlCommand cmd = new SqlCommand(); try { //循环 foreach (DictionaryEntry myDE in SQLStringList) { string cmdText = myDE.Key.ToString(); SqlParameter[] cmdParms = (SqlParameter[])myDE.Value; PrepareCommand(cmd, conn, trans, cmdText, cmdParms); int val = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); } trans.Commit(); } catch { trans.Rollback(); throw; } } } } ///

/// 执行多条SQL语句，实现数据库事务。 ///

/// SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]） public static int ExecuteSqlTran(System.Collections.Generic.List cmdList) { using (SqlConnection conn = new SqlConnection(connectionString)) { conn.Open(); using (SqlTransaction trans = conn.BeginTransaction()) { SqlCommand cmd = new SqlCommand(); try { int count = 0; //循环 foreach (CommandInfo myDE in cmdList) { string cmdText = myDE.CommandText; SqlParameter[] cmdParms = (SqlParameter[])myDE.Parameters; PrepareCommand(cmd, conn, trans, cmdText, cmdParms); if (myDE.EffentNextType == EffentNextType.WhenHaveContine || myDE.EffentNextType == EffentNextType.WhenNoHaveContine) { if (myDE.CommandText.ToLower().IndexOf("count(") == -1) { trans.Rollback(); return 0; } object obj = cmd.ExecuteScalar(); bool isHave = false; if (obj == null && obj == DBNull.Value) { isHave = false; } isHave = Convert.ToInt32(obj) > 0; if (myDE.EffentNextType == EffentNextType.WhenHaveContine && !isHave) { trans.Rollback(); return 0; } if (myDE.EffentNextType == EffentNextType.WhenNoHaveContine && isHave) { trans.Rollback(); return 0; } continue; } int val = cmd.ExecuteNonQuery(); count += val; if (myDE.EffentNextType == EffentNextType.ExcuteEffectRows && val == 0) { trans.Rollback(); return 0; } cmd.Parameters.Clear(); } trans.Commit(); return count; } catch { trans.Rollback(); throw; } } } } ///

/// 执行多条SQL语句，实现数据库事务。 ///

/// SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]） public static void ExecuteSqlTranWithIndentity(System.Collections.Generic.List SQLStringList) { using (SqlConnection conn = new SqlConnection(connectionString)) { conn.Open(); using (SqlTransaction trans = conn.BeginTransaction()) { SqlCommand cmd = new SqlCommand(); try { int indentity = 0; //循环 foreach (CommandInfo myDE in SQLStringList) { string cmdText = myDE.CommandText; SqlParameter[] cmdParms = (SqlParameter[])myDE.Parameters; foreach (SqlParameter q in cmdParms) { if (q.Direction == ParameterDirection.InputOutput) { q.Value = indentity; } } PrepareCommand(cmd, conn, trans, cmdText, cmdParms); int val = cmd.ExecuteNonQuery(); foreach (SqlParameter q in cmdParms) { if (q.Direction == ParameterDirection.Output) { indentity = Convert.ToInt32(q.Value); } } cmd.Parameters.Clear(); } trans.Commit(); } catch { trans.Rollback(); throw; } } } } ///

/// 执行多条SQL语句，实现数据库事务。 ///

/// SQL语句的哈希表（key为sql语句，value是该语句的SqlParameter[]） public static void ExecuteSqlTranWithIndentity(Hashtable SQLStringList) { using (SqlConnection conn = new SqlConnection(connectionString)) { conn.Open(); using (SqlTransaction trans = conn.BeginTransaction()) { SqlCommand cmd = new SqlCommand(); try { int indentity = 0; //循环 foreach (DictionaryEntry myDE in SQLStringList) { string cmdText = myDE.Key.ToString(); SqlParameter[] cmdParms = (SqlParameter[])myDE.Value; foreach (SqlParameter q in cmdParms) { if (q.Direction == ParameterDirection.InputOutput) { q.Value = indentity; } } PrepareCommand(cmd, conn, trans, cmdText, cmdParms); int val = cmd.ExecuteNonQuery(); foreach (SqlParameter q in cmdParms) { if (q.Direction == ParameterDirection.Output) { indentity = Convert.ToInt32(q.Value); } } cmd.Parameters.Clear(); } trans.Commit(); } catch { trans.Rollback(); throw; } } } } ///

/// 执行一条计算查询结果语句，返回查询结果（object）。 ///

/// 计算查询结果语句 /// 查询结果（object） public static object GetSingle(string SQLString, params SqlParameter[] cmdParms) { using (SqlConnection connection = new SqlConnection(connectionString)) { using (SqlCommand cmd = new SqlCommand()) { try { PrepareCommand(cmd, connection, null, SQLString, cmdParms); object obj = cmd.ExecuteScalar(); cmd.Parameters.Clear(); if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value))) { return null; } else { return obj; } } catch (System.Data.SqlClient.SqlException e) { throw e; } } } } ///

/// 执行查询语句，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close ) ///

/// 查询语句 /// SqlDataReader public static SqlDataReader ExecuteReader(string SQLString, params SqlParameter[] cmdParms) { SqlConnection connection = new SqlConnection(connectionString); SqlCommand cmd = new SqlCommand(); try { PrepareCommand(cmd, connection, null, SQLString, cmdParms); SqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection); cmd.Parameters.Clear(); return myReader; } catch (System.Data.SqlClient.SqlException e) { throw e; } // finally // { // cmd.Dispose(); // connection.Close(); // } } ///

/// 执行查询语句，返回DataSet ///

/// 查询语句 /// DataSet public static DataSet Query(string SQLString, params SqlParameter[] cmdParms) { using (SqlConnection connection = new SqlConnection(connectionString)) { SqlCommand cmd = new SqlCommand(); PrepareCommand(cmd, connection, null, SQLString, cmdParms); using (SqlDataAdapter da = new SqlDataAdapter(cmd)) { DataSet ds = new DataSet(); try { da.Fill(ds, "ds"); cmd.Parameters.Clear(); } catch (System.Data.SqlClient.SqlException ex) { throw new Exception(ex.Message); } return ds; } } } private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, string cmdText, SqlParameter[] cmdParms) { if (conn.State != ConnectionState.Open) conn.Open(); cmd.Connection = conn; cmd.CommandText = cmdText; if (trans != null) cmd.Transaction = trans; cmd.CommandType = CommandType.Text;//cmdType; if (cmdParms != null) { foreach (SqlParameter parameter in cmdParms) { if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) && (parameter.Value == null)) { parameter.Value = DBNull.Value; } cmd.Parameters.Add(parameter); } } } #endregion #region 存储过程操作 ///

/// 执行存储过程，返回SqlDataReader ( 注意：调用该方法后，一定要对SqlDataReader进行Close ) ///

/// 存储过程名 /// 存储过程参数 /// SqlDataReader public static SqlDataReader RunProcedure(string storedProcName, IDataParameter[] parameters) { SqlConnection connection = new SqlConnection(connectionString); SqlDataReader returnReader; connection.Open(); SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters); command.CommandType = CommandType.StoredProcedure; returnReader = command.ExecuteReader(CommandBehavior.CloseConnection); return returnReader; } ///

/// 执行存储过程 ///

/// 存储过程名 /// 存储过程参数 /// DataSet结果中的表名 /// DataSet public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName) { using (SqlConnection connection = new SqlConnection(connectionString)) { DataSet dataSet = new DataSet(); connection.Open(); SqlDataAdapter sqlDA = new SqlDataAdapter(); sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters); sqlDA.Fill(dataSet, tableName); connection.Close(); return dataSet; } } public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName, int Times) { using (SqlConnection connection = new SqlConnection(connectionString)) { DataSet dataSet = new DataSet(); connection.Open(); SqlDataAdapter sqlDA = new SqlDataAdapter(); sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters); sqlDA.SelectCommand.CommandTimeout = Times; sqlDA.Fill(dataSet, tableName); connection.Close(); return dataSet; } } ///

/// 构建 SqlCommand 对象(用来返回一个结果集，而不是一个整数值) ///

/// 数据库连接 /// 存储过程名 /// 存储过程参数 /// SqlCommand private static SqlCommand BuildQueryCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters) { SqlCommand command = new SqlCommand(storedProcName, connection); command.CommandType = CommandType.StoredProcedure; foreach (SqlParameter parameter in parameters) { if (parameter != null) { // 检查未分配值的输出参数,将其分配以DBNull.Value. if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) && (parameter.Value == null)) { parameter.Value = DBNull.Value; } command.Parameters.Add(parameter); } } return command; } ///

/// 执行存储过程，返回影响的行数 ///

/// 存储过程名 /// 存储过程参数 /// 影响的行数 /// public static int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected) { using (SqlConnection connection = new SqlConnection(connectionString)) { int result; connection.Open(); SqlCommand command = BuildIntCommand(connection, storedProcName, parameters); rowsAffected = command.ExecuteNonQuery(); result = (int)command.Parameters["ReturnValue"].Value; //Connection.Close(); return result; } } ///

/// 创建 SqlCommand 对象实例(用来返回一个整数值) ///

/// 存储过程名 /// 存储过程参数 /// SqlCommand 对象实例 private static SqlCommand BuildIntCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters) { SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters); command.Parameters.Add(new SqlParameter("ReturnValue", SqlDbType.Int, 4, ParameterDirection.ReturnValue, false, 0, 0, string.Empty, DataRowVersion.Default, null)); return command; } #endregion } }

public void AddItem(string cartID, int bookID, int quantity) { // 新建Connection和Command对象 SqlConnection myConnection = new SqlConnection(ConfigurationSettings.AppSettings["ConnectionString"]); SqlCommand myCommand = new SqlCommand("ShoppingCartAddItem", myConnection); // 指定命令对象为存储过程 myCommand.CommandType = CommandType.StoredProcedure; // 为存储过程添加参数信息 SqlParameter parameterBookID = new SqlParameter("@BookID", SqlDbType.Int, 4); parameterBookID.Value = bookID; myCommand.Parameters.Add(parameterBookID); SqlParameter parameterCartID = new SqlParameter("@CartID", SqlDbType.NVarChar, 50); parameterCartID.Value = cartID; myCommand.Parameters.Add(parameterCartID); SqlParameter parameterQuantity = new SqlParameter("@Quantity", SqlDbType.Int, 4); parameterQuantity.Value = quantity; myCommand.Parameters.Add(parameterQuantity); // 打开连接并执行操作 myConnection.Open(); myCommand.ExecuteNonQuery(); myConnection.Close(); } ///

/// 获取购物车图书总数量 ///

/// /// public int GetItemCount(string cartID) { // 新建Connection和Command对象 SqlConnection myConnection = new SqlConnection(ConfigurationSettings.AppSettings["ConnectionString"]); SqlCommand myCommand = new SqlCommand("ShoppingCartItemCount", myConnection); // 指定命令类型为存储过程 myCommand.CommandType = CommandType.StoredProcedure; SqlParameter parameterCartID = new SqlParameter("@CartID", SqlDbType.NVarChar, 50); parameterCartID.Value = cartID; myCommand.Parameters.Add(parameterCartID); // 添加输出参数 SqlParameter parameterItemCount = new SqlParameter("@ItemCount", SqlDbType.Int, 4); //指定参数类型为输出参数 parameterItemCount.Direction = ParameterDirection.Output; myCommand.Parameters.Add(parameterItemCount); // 打开连接并执行操作 myConnection.Open(); myCommand.ExecuteNonQuery(); myConnection.Close(); // 通过存储过程的输出参数来返回购物车总图书量 return ((int)parameterItemCount.Value); } ///

/// 根据购物车ID获取购物车信息 ///

/// 购物车ID /// DataReader：购物车具体信息 public SqlDataReader GetItems(string cartID) { // 新建Connection和Command实例 SqlConnection myConnection = new SqlConnection(ConfigurationSettings.AppSettings["ConnectionString"]); SqlCommand myCommand = new SqlCommand("ShoppingCartList", myConnection); // 指定命令为存储过程 myCommand.CommandType = CommandType.StoredProcedure; // 添加参数购物车编号到存储过程 SqlParameter parameterCartID = new SqlParameter("@CartID", SqlDbType.NVarChar, 50); parameterCartID.Value = cartID; myCommand.Parameters.Add(parameterCartID); // 打开连接，执行操作 myConnection.Open(); SqlDataReader result = myCommand.ExecuteReader(CommandBehavior.CloseConnection); // 返回数据读取器 return result; } ///

/// 获取购物车中图书的总价 ///

/// 购物车编号 /// 总价 public decimal GetTotal(string cartID) { // 新建Connection和Command对象 SqlConnection myConnection = new SqlConnection(ConfigurationSettings.AppSettings["ConnectionString"]); SqlCommand myCommand = new SqlCommand("ShoppingCartTotal", myConnection); // 指定命令类型为存储过程 myCommand.CommandType = CommandType.StoredProcedure; // 添加参数到存储过程 SqlParameter parameterCartID = new SqlParameter("@CartID", SqlDbType.NVarChar, 50); parameterCartID.Value = cartID; myCommand.Parameters.Add(parameterCartID); //添加输出总价的参数到存储过程 SqlParameter parameterTotalCost = new SqlParameter("@TotalCost", SqlDbType.Money, 8); parameterTotalCost.Direction = ParameterDirection.Output; myCommand.Parameters.Add(parameterTotalCost); // 打开连接，执行操作 myConnection.Open(); myCommand.ExecuteNonQuery(); myConnection.Close(); // 返回结果 if (parameterTotalCost.Value.ToString() != "") { return (decimal)parameterTotalCost.Value; } else { return 0; } } ///

/// 合并购物车：用于合并用户登陆前和登陆后的购物车 ///

/// 登陆前的购物车ID /// 登陆后的购物车ID public void MigrateCart(String oldCartId, String newCartId) { // 新建Connection和Command实例 SqlConnection myConnection = new SqlConnection(ConfigurationSettings.AppSettings["ConnectionString"]); SqlCommand myCommand = new SqlCommand("ShoppingCartMigrate", myConnection); // 指定操作类型为存储过程 myCommand.CommandType = CommandType.StoredProcedure; // 添加参数到存储过程 SqlParameter cart1 = new SqlParameter("@OriginalCartId ", SqlDbType.NVarChar, 50); cart1.Value = oldCartId; myCommand.Parameters.Add(cart1); SqlParameter cart2 = new SqlParameter("@NewCartId ", SqlDbType.NVarChar, 50); cart2.Value = newCartId; myCommand.Parameters.Add(cart2); // 打开连接，执行操作 myConnection.Open(); myCommand.ExecuteNonQuery(); myConnection.Close(); } ///

/// 删除购物车中的图书 ///

/// 购物车编号 /// 图书编号 public void RemoveItem(string cartID, int bookID) { // 新建Connection和Command实例 SqlConnection myConnection = new SqlConnection(ConfigurationSettings.AppSettings["ConnectionString"]); SqlCommand myCommand = new SqlCommand("ShoppingCartRemoveItem", myConnection); // 指定操作类型为存储过程 myCommand.CommandType = CommandType.StoredProcedure; // 添加参数给存储过程 SqlParameter parameterProductID = new SqlParameter("@ProductID", SqlDbType.Int, 4); parameterProductID.Value = bookID; myCommand.Parameters.Add(parameterProductID); SqlParameter parameterCartID = new SqlParameter("@CartID", SqlDbType.NVarChar, 50); parameterCartID.Value = cartID; myCommand.Parameters.Add(parameterCartID); // 打开连接，执行操作 myConnection.Open(); myCommand.ExecuteNonQuery(); myConnection.Close(); } ///

/// 更新购物车中图书信息 ///

/// 购物车编号 /// 图书编号 /// 图书数量 public void UpdateItem(string cartID, int productID, int quantity) { // 如果输入数量小于0则抛出异常 if (quantity < 0) { throw new Exception("Quantity cannot be a negative number"); } // 新建Connection和Command实例 SqlConnection myConnection = new SqlConnection(ConfigurationSettings.AppSettings["ConnectionString"]); SqlCommand myCommand = new SqlCommand("ShoppingCartUpdate", myConnection); // 指定操作为存储过程 myCommand.CommandType = CommandType.StoredProcedure; // 添加参数给存储过程 SqlParameter parameterProductID = new SqlParameter("@ProductID", SqlDbType.Int, 4); parameterProductID.Value = productID; myCommand.Parameters.Add(parameterProductID); SqlParameter parameterCartID = new SqlParameter("@CartID", SqlDbType.NVarChar, 50); parameterCartID.Value = cartID; myCommand.Parameters.Add(parameterCartID); SqlParameter parameterQuantity = new SqlParameter("@Quantity", SqlDbType.Int, 4); parameterQuantity.Value = quantity; myCommand.Parameters.Add(parameterQuantity); // 打开连接，执行操作 myConnection.Open(); myCommand.ExecuteNonQuery(); myConnection.Close();

/// <summary> /// 获取一个部门的溯源的全名称（含父级名称） /// </summary> /// <param name="guid">部门guid</param> /// <returns></returns> public virtual async Task<string> Proc_fu...

用来创建DataRead的存储过程调用;//数据库连接字符串stringconnStr="Server=localhost;database=stuIMS;uid=sa;pwd=admin";//建立连接SqlConnection conn=new SqlConnection(connStr);//建立查询命令SqlCommand myCommand=newSqlCommand("存储过程名",...

转自：http://www.cnblogs.com/czh-liyu/archive/2007/12/25/1014817.html用一个命令对象调用存储过程，就是定义存储过程的名称，给过程的每个参数添加参数定义，然后用上一节中给出的方法执行命令。为了使本节的示例更有说服力，下面定义一组可以用于插入、更新和删除Northwind示例数据库中Region表的记录的存储过程，这个表尽管很小，但

62,041

社区成员

669,051

社区内容

发帖

与我相关

我的任务

javascript云原生企业社区

社区管理员

加入社区

近7日
近30日
至今

加载中

查看更多榜单

社区公告

.NET 社区是一个围绕开源 .NET 的开放、热情、创新、包容的技术社区。社区致力于为广大 .NET 爱好者提供一个良好的知识共享、协同互助的 .NET 技术交流环境。我们尊重不同意见，支持健康理性的辩论和互动，反对歧视和攻击。

希望和大家一起共同营造一个活跃、友好的社区氛围。

试试用AI创作助手写篇文章吧

+ 用AI写文章