Ado.net連線資料庫常用工具類
阿新 • • 發佈：2018-12-16
using System; using System.Data; using System.Xml; using System.Data.SqlClient; using System.Collections; using System.Configuration;
namespace BookDAL { /// /// SqlServer資料訪問幫助類 /// public sealed class SqlHelper { #region 私有建構函式和方法
private SqlHelper() { }
/// <summary>
/// 將SqlParameter引數陣列(引數值)分配給SqlCommand命令.
/// 這個方法將給任何一個引數分配DBNull.Value;
/// 該操作將阻止預設值的使用.
/// </summary>
/// <param name="command">命令名</param>
/// <param name="commandParameters">SqlParameters陣列</param>
private static void AttachParameters(SqlCommand command, SqlParameter[] commandParameters)
{
if (command == null) throw new ArgumentNullException("command");
if (commandParameters != null)
{
foreach (SqlParameter p in commandParameters)
{
if (p != null)
{
// 檢查未分配值的輸出引數,將其分配以DBNull.Value.
if ((p.Direction == ParameterDirection.InputOutput || p.Direction == ParameterDirection.Input) &&
(p.Value == null))
{
p.Value = DBNull.Value;
}
command.Parameters.Add(p);
}
}
}
}
/// <summary>
/// 將DataRow型別的列值分配到SqlParameter引數陣列.
/// </summary>
/// <param name="commandParameters">要分配值的SqlParameter引數陣列</param>
/// <param name="dataRow">將要分配給儲存過程引數的DataRow</param>
private static void AssignParameterValues(SqlParameter[] commandParameters, DataRow dataRow)
{
if ((commandParameters == null) || (dataRow == null))
{
return;
}
int i = 0;
// 設定引數值
foreach (SqlParameter commandParameter in commandParameters)
{
// 建立引數名稱,如果不存在,只丟擲一個異常.
if (commandParameter.ParameterName == null ||
commandParameter.ParameterName.Length <= 1)
throw new Exception(
string.Format("請提供引數{0}一個有效的名稱{1}.", i, commandParameter.ParameterName));
// 從dataRow的表中獲取為引數陣列中陣列名稱的列的索引.
// 如果存在和引數名稱相同的列,則將列值賦給當前名稱的引數.
if (dataRow.Table.Columns.IndexOf(commandParameter.ParameterName.Substring(1)) != -1)
commandParameter.Value = dataRow[commandParameter.ParameterName.Substring(1)];
i++;
}
}
/// <summary>
/// 將一個物件陣列分配給SqlParameter引數陣列.
/// </summary>
/// <param name="commandParameters">要分配值的SqlParameter引數陣列</param>
/// <param name="parameterValues">將要分配給儲存過程引數的物件陣列</param>
private static void AssignParameterValues(SqlParameter[] commandParameters, object[] parameterValues)
{
if ((commandParameters == null) || (parameterValues == null))
{
return;
}
// 確保物件陣列個數與引數個數匹配,如果不匹配,丟擲一個異常.
if (commandParameters.Length != parameterValues.Length)
{
throw new ArgumentException("引數值個數與引數不匹配.");
}
// 給引數賦值
for (int i = 0, j = commandParameters.Length; i < j; i++)
{
// If the current array value derives from IDbDataParameter, then assign its Value property
if (parameterValues[i] is IDbDataParameter)
{
IDbDataParameter paramInstance = (IDbDataParameter)parameterValues[i];
if (paramInstance.Value == null)
{
commandParameters[i].Value = DBNull.Value;
}
else
{
commandParameters[i].Value = paramInstance.Value;
}
}
else if (parameterValues[i] == null)
{
commandParameters[i].Value = DBNull.Value;
}
else
{
commandParameters[i].Value = parameterValues[i];
}
}
}
/// <summary>
/// 預處理使用者提供的命令,資料庫連線/事務/命令型別/引數
/// </summary>
/// <param name="command">要處理的SqlCommand</param>
/// <param name="connection">資料庫連線</param>
/// <param name="transaction">一個有效的事務或者是null值</param>
/// <param name="commandType">命令型別 (儲存過程,命令文字, 其它.)</param>
/// <param name="commandText">儲存過程名或都T-SQL命令文字</param>
/// <param name="commandParameters">和命令相關聯的SqlParameter引數陣列,如果沒有引數為'null'</param>
/// <param name="mustCloseConnection"><c>true</c> 如果連線是開啟的,則為true,其它情況下為false.</param>
private static void PrepareCommand(SqlCommand command, SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, out bool mustCloseConnection)
{
if (command == null) throw new ArgumentNullException("command");
if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");
// If the provided connection is not open, we will open it
if (connection.State != ConnectionState.Open)
{
mustCloseConnection = true;
connection.Open();
}
else
{
mustCloseConnection = false;
}
// 給命令分配一個數據庫連線.
command.Connection = connection;
// 設定命令文字(儲存過程名或SQL語句)
command.CommandText = commandText;
// 分配事務
if (transaction != null)
{
if (transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
command.Transaction = transaction;
}
// 設定命令型別.
command.CommandType = commandType;
// 分配命令引數
if (commandParameters != null)
{
AttachParameters(command, commandParameters);
}
return;
}
#endregion 私有建構函式和方法結束
#region 資料庫連線
/// <summary>
/// 一個有效的資料庫連線字串
/// </summary>
/// <returns></returns>
public static string GetConnSting()
{
return ConfigurationManager.ConnectionStrings["ConStr"].ConnectionString;
}
/// <summary>
/// 一個有效的資料庫連線物件
/// </summary>
/// <returns></returns>
public static SqlConnection GetConnection()
{
SqlConnection Connection = new SqlConnection(SqlHelper.GetConnSting());
return Connection;
}
#endregion
#region ExecuteNonQuery命令
/// <summary>
/// 執行指定連線字串,型別的SqlCommand.
/// </summary>
/// <remarks>
/// 示例:
/// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders");
/// </remarks>
/// <param name="connectionString">一個有效的資料庫連線字串</param>
/// <param name="commandType">命令型別 (儲存過程,命令文字, 其它.)</param>
/// <param name="commandText">儲存過程名稱或SQL語句</param>
/// <returns>返回命令影響的行數</returns>
public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText)
{
return ExecuteNonQuery(connectionString, commandType, commandText, (SqlParameter[])null);
}
/// <summary>
/// 執行指定連線字串,型別的SqlCommand.如果沒有提供引數,不返回結果.
/// </summary>
/// <remarks>
/// 示例:
/// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString">一個有效的資料庫連線字串</param>
/// <param name="commandType">命令型別 (儲存過程,命令文字, 其它.)</param>
/// <param name="commandText">儲存過程名稱或SQL語句</param>
/// <param name="commandParameters">SqlParameter引數陣列</param>
/// <returns>返回命令影響的行數</returns>
public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();
return ExecuteNonQuery(connection, commandType, commandText, commandParameters);
}
}
/// <summary>
/// 執行指定連線字串的儲存過程,將物件陣列的值賦給儲存過程引數,
/// 此方法需要在引數快取方法中探索引數並生成引數.
/// </summary>
/// <remarks>
/// 這個方法沒有提供訪問輸出引數和返回值.
/// 示例:
/// int result = ExecuteNonQuery(connString, "PublishOrders", 24, 36);
/// </remarks>
/// <param name="connectionString">一個有效的資料庫連線字串/param>
/// <param name="spName">儲存過程名稱</param>
/// <param name="parameterValues">分配到儲存過程輸入引數的物件陣列</param>
/// <returns>返回受影響的行數</returns>
public static int ExecuteNonQuery(string connectionString, string spName, params object[] parameterValues)
{
if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
// 如果存在引數值
if ((parameterValues != null) && (parameterValues.Length > 0))
{
// 從探索儲存過程引數(載入到快取)並分配給儲存過程引數陣列.
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
// 給儲存過程引數賦值
AssignParameterValues(commandParameters, parameterValues);
return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
// 沒有引數情況下
return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 執行指定資料庫連線物件的命令
/// </summary>
/// <remarks>
/// 示例:
/// int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders");
/// </remarks>
/// <param name="connection">一個有效的資料庫連線物件</param>
/// <param name="commandType">命令型別(儲存過程,命令文字或其它.)</param>
/// <param name="commandText">儲存過程名稱或T-SQL語句</param>
/// <returns>返回影響的行數</returns>
public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText)
{
return ExecuteNonQuery(connection, commandType, commandText, (SqlParameter[])null);
}
/// <summary>
/// 執行指定資料庫連線物件的命令
/// </summary>
/// <remarks>
/// 示例:
/// int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connection">一個有效的資料庫連線物件</param>
/// <param name="commandType">命令型別(儲存過程,命令文字或其它.)</param>
/// <param name="commandText">T儲存過程名稱或T-SQL語句</param>
/// <param name="commandParameters">SqlParamter引數陣列</param>
/// <returns>返回影響的行數</returns>
public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connection == null) throw new ArgumentNullException("connection");
// 建立SqlCommand命令,並進行預處理
SqlCommand cmd = new SqlCommand();
bool mustCloseConnection = false;
PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);
// Finally, execute the command
int retval = cmd.ExecuteNonQuery();
// 清除引數,以便再次使用.
cmd.Parameters.Clear();
if (mustCloseConnection)
connection.Close();
return retval;
}
/// <summary>
/// 執行指定資料庫連線物件的命令,將物件陣列的值賦給儲存過程引數.
/// </summary>
/// <remarks>
/// 此方法不提供訪問儲存過程輸出引數和返回值
/// 示例:
/// int result = ExecuteNonQuery(conn, "PublishOrders", 24, 36);
/// </remarks>
/// <param name="connection">一個有效的資料庫連線物件</param>
/// <param name="spName">儲存過程名</param>
/// <param name="parameterValues">分配給儲存過程輸入引數的物件陣列</param>
/// <returns>返回影響的行數</returns>
public static int ExecuteNonQuery(SqlConnection connection, string spName, params object[] parameterValues)
{
if (connection == null) throw new ArgumentNullException("connection");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
// 如果有引數值
if ((parameterValues != null) && (parameterValues.Length > 0))
{
// 從快取中載入儲存過程引數
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
// 給儲存過程分配引數值
AssignParameterValues(commandParameters, parameterValues);
return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 執行帶事務的SqlCommand.
/// </summary>
/// <remarks>
/// 示例.:
/// int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders");
/// </remarks>
/// <param name="transaction">一個有效的資料庫連線物件</param>
/// <param name="commandType">命令型別(儲存過程,命令文字或其它.)</param>
/// <param name="commandText">儲存過程名稱或T-SQL語句</param>
/// <returns>返回影響的行數/returns>
public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText)
{
return ExecuteNonQuery(transaction, commandType, commandText, (SqlParameter[])null);
}
/// <summary>
/// 執行帶事務的SqlCommand(指定引數).
/// </summary>
/// <remarks>
/// 示例:
/// int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="transaction">一個有效的資料庫連線物件</param>
/// <param name="commandType">命令型別(儲存過程,命令文字或其它.)</param>
/// <param name="commandText">儲存過程名稱或T-SQL語句</param>
/// <param name="commandParameters">SqlParamter引數陣列</param>
/// <returns>返回影響的行數</returns>
public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (transaction == null) throw new ArgumentNullException("transaction");
if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
// 預處理
SqlCommand cmd = new SqlCommand();
bool mustCloseConnection = false;
PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
// 執行
int retval = cmd.ExecuteNonQuery();
// 清除引數集,以便再次使用.
cmd.Parameters.Clear();
return retval;
}
/// <summary>
/// 執行帶事務的SqlCommand(指定引數值).
/// </summary>
/// <remarks>
/// 此方法不提供訪問儲存過程輸出引數和返回值
/// 示例:
/// int result = ExecuteNonQuery(conn, trans, "PublishOrders", 24, 36);
/// </remarks>
/// <param name="transaction">一個有效的資料庫連線物件</param>
/// <param name="spName">儲存過程名</param>
/// <param name="parameterValues">分配給儲存過程輸入引數的物件陣列</param>
/// <returns>返回受影響的行數</returns>
public static int ExecuteNonQuery(SqlTransaction transaction, string spName, params object[] parameterValues)
{
if (transaction == null) throw new ArgumentNullException("transaction");
if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
// 如果有引數值
if ((parameterValues != null) && (parameterValues.Length > 0))
{
// 從快取中載入儲存過程引數,如果快取中不存在則從資料庫中檢索引數資訊並載入到快取中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
// 給儲存過程引數賦值
AssignParameterValues(commandParameters, parameterValues);
// 呼叫過載方法
return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
// 沒有引數值
return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
}
}
#endregion ExecuteNonQuery方法結束
#region ExecuteDataset方法
/// <summary>
/// 執行指定資料庫連線字串的命令,返回DataSet.
/// </summary>
/// <remarks>
/// 示例:
/// DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="connectionString">一個有效的資料庫連線字串</param>
/// <param name="commandType">命令型別 (儲存過程,命令文字或其它)</param>
/// <param name="commandText">儲存過程名稱或T-SQL語句</param>
/// <returns>返回一個包含結果集的DataSet</returns>
public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)
{
return ExecuteDataset(connectionString, commandType, commandText, (SqlParameter[])null);
}
/// <summary>
/// 執行指定資料庫連線字串的命令,返回DataSet.
/// </summary>
/// <remarks>
/// 示例:
/// DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString">一個有效的資料庫連線字串</param>
/// <param name="commandType">命令型別 (儲存過程,命令文字或其它)</param>
/// <param name="commandText">儲存過程名稱或T-SQL語句</param>
/// <param name="commandParameters">SqlParamters引數陣列</param>
/// <returns>返回一個包含結果集的DataSet</returns>
public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
// 建立並開啟資料庫連線物件,操作完成釋放物件.
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();
// 呼叫指定資料庫連線字串過載方法.
return ExecuteDataset(connection, commandType, commandText, commandParameters);
}
}
/// <summary>
/// 執行指定資料庫連線字串的命令,直接提供引數值,返回DataSet.
/// </summary>
/// <remarks>
/// 此方法不提供訪問儲存過程輸出引數和返回值.
/// 示例:
/// DataSet ds = ExecuteDataset(connString, "GetOrders", 24, 36);
/// </remarks>
/// <param name="connectionString">一個有效的資料庫連線字串</param>
/// <param name="spName">儲存過程名</param>
/// <param name="parameterValues">分配給儲存過程輸入引數的物件陣列</param>
/// <returns>返回一個包含結果集的DataSet</returns>
public static DataSet ExecuteDataset(string connectionString, string spName, params object[] parameterValues)
{
if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
if ((parameterValues != null) && (parameterValues.Length > 0))
{
// 從快取中檢索儲存過程引數
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
// 給儲存過程引數分配值
AssignParameterValues(commandParameters, parameterValues);
return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 執行指定資料庫連線物件的命令,返回DataSet.
/// </summary>
/// <remarks>
/// 示例:
/// DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="connection">一個有效的資料庫連線物件</param>
/// <param name="commandType">命令型別 (儲存過程,命令文字或其它)</param>
/// <param name="commandText">儲存過程名或T-SQL語句</param>
/// <returns>返回一個包含結果集的DataSet</returns>
public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText)
{
return ExecuteDataset(connection, commandType, commandText, (SqlParameter[])null);
}
/// <summary>
/// 執行指定資料庫連線物件的命令,指定儲存過程引數,返回DataSet.
/// </summary>
/// <remarks>
/// 示例:
/// DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connection">一個有效的資料庫連線物件</param>
/// <param name="commandType">命令型別 (儲存過程,命令文字或其它)</param>
/// <param name="commandText">儲存過程名或T-SQL語句</param>
/// <param name="commandParameters">SqlParamter引數陣列</param>
/// <returns>返回一個包含結果集的DataSet</returns>
public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connection == null) throw new ArgumentNullException("connection");
// 預處理
SqlCommand cmd = new SqlCommand();
bool mustCloseConnection = false;
PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);
// 建立SqlDataAdapter和DataSet.
using (SqlDataAdapter da = new SqlDataAdapter(cmd))
{
DataSet ds = new DataSet();
// 填充DataSet.
da.Fill(ds);
cmd.Parameters.Clear();
if (mustCloseConnection)
connection.Close();
return ds;
}
}
/// <summary>
/// 執行指定資料庫連線物件的命令,指定引數值,返回DataSet.
/// </summary>
/// <remarks>
/// 此方法不提供訪問儲存過程輸入引數和返回值.
/// 示例.:
/// DataSet ds = ExecuteDataset(conn, "GetOrders", 24, 36);
/// </remarks>
/// <param name="connection">一個有效的資料庫連線物件</param>
/// <param name="spName">儲存過程名</param>
/// <param name="parameterValues">分配給儲存過程輸入引數的物件陣列</param>
/// <returns>返回一個包含結果集的DataSet</returns>
public static DataSet ExecuteDataset(SqlConnection connection, string spName, params object[] parameterValues)
{
if (connection == null) throw new ArgumentNullException("connection");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
if ((parameterValues != null) && (parameterValues.Length > 0))
{
// 比快取中載入儲存過程引數
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
// 給儲存過程引數分配值
AssignParameterValues(commandParameters, parameterValues);
return ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return ExecuteDataset(connection, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 執行指定事務的命令,返回DataSet.
/// </summary>
/// <remarks>
/// 示例:
/// DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="transaction">事務</param>
/// <param name="commandType">命令型別 (儲存過程,命令文字或其它)</param>
/// <param name="commandText">儲存過程名或T-SQL語句</param>
/// <returns>返回一個包含結果集的DataSet</returns>
public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText)
{
return ExecuteDataset(transaction, commandType, commandText, (SqlParameter[])null);
}
/// <summary>
/// 執行指定事務的命令,指定引數,返回DataSet.
/// </summary>
/// <remarks>
/// 示例:
/// DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="transaction">事務</param>
/// <param name="commandType">命令型別 (儲存過程,命令文字或其它)</param>
/// <param name="commandText">儲存過程名或T-SQL語句</param>
/// <param name="commandParameters">SqlParamter引數陣列</param>
/// <returns>返回一個包含結果集的DataSet</returns>
public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (transaction == null) throw new ArgumentNullException("transaction");
if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
// 預處理
SqlCommand cmd = new SqlCommand();
bool mustCloseConnection = false;
PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
// 建立 DataAdapter & DataSet
using (SqlDataAdapter da = new SqlDataAdapter(cmd))
{
DataSet ds = new DataSet();
da.Fill(ds);
cmd.Parameters.Clear();
return ds;
}
}
/// <summary>
/// 執行指定事務的命令,指定引數值,返回DataSet.
/// </summary>
/// <remarks>
/// 此方法不提供訪問儲存過程輸入引數和返回值.
/// 示例.:
/// DataSet ds = ExecuteDataset(trans, "GetOrders", 24, 36);
/// </remarks>
/// <param name="transaction">事務</param>
/// <param name="spName">儲存過程名</param>
/// <param name="parameterValues">分配給儲存過程輸入引數的物件陣列</param>
/// <returns>返回一個包含結果集的DataSet</returns>
public static DataSet ExecuteDataset(SqlTransaction transaction, string spName, params object[] parameterValues)
{
if (transaction == null) throw new ArgumentNullException("transaction");
if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
if ((parameterValues != null) && (parameterValues.Length > 0))
{
// 從快取中載入儲存過程引數
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
// 給儲存過程引數分配值
AssignParameterValues(commandParameters, parameterValues);
return ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
}
}
#endregion ExecuteDataset資料集命令結束
#region ExecuteReader 資料閱讀器
/// <summary>
/// 列舉,標識資料庫連線是由SqlHelper提供還是由呼叫者提供
/// </summary>
private enum SqlConnectionOwnership
{
/// <summary>由SqlHelper提供連線</summary>
Internal,
/// <summary>由呼叫者提供連線</summary>
External
}
/// <summary>
/// 執行指定資料庫連線物件的資料閱讀器.
/// </summary>
/// <remarks>
/// 如果是SqlHelper開啟連線,當連線關閉DataReader也將關閉.
/// 如果是呼叫都開啟連線,DataReader由呼叫都管理.
/// </remarks>
/// <param name="connection">一個有效的資料庫連線物件</param>
/// <param name="transaction">一個有效的事務,或者為 'null'</param>
/// <param name="commandType">命令型別 (儲存過程,命令文字或其它)</param>
/// <param name="commandText">儲存過程名或T-SQL語句</param>
/// <param name="commandParameters">SqlParameters引數陣列,如果沒有引數則為'null'</param>
/// <param name="connectionOwnership">標識資料庫連線物件是由呼叫者提供還是由SqlHelper提供</param>
/// <returns>返回包含結果集的SqlDataReader</returns>
private static SqlDataReader ExecuteReader(SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, SqlConnectionOwnership connectionOwnership)
{
if (connection == null) throw new ArgumentNullException("connection");
bool mustCloseConnection = false;
// 建立命令
SqlCommand cmd = new SqlCommand();
try
{
PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
// 建立資料閱讀器
SqlDataReader dataReader;
if (connectionOwnership == SqlConnectionOwnership.External)
{
dataReader = cmd.ExecuteReader();
}
else
{
dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
}
// 清除引數,以便再次使用..
// HACK: There is a problem here, the output parameter values are fletched
// when the reader is closed, so if the parameters are detached from the command
// then the SqlReader can磘 set its values.
// When this happen, the parameters can磘 be used again in other command.
bool canClear = true;
foreach (SqlParameter commandParameter in cmd.Parameters)
{
if (commandParameter.Direction != ParameterDirection.Input)
canClear = false;
}
if (canClear)
{
cmd.Parameters.Clear();
}
return dataReader;
}
catch
{
if (mustCloseConnection)
connection.Close();
throw;
}
}
/// <summary>
/// 執行指定資料庫連線字串的資料閱讀器.
/// </summary>
/// <remarks>
/// 示例:
/// SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="connectionString">一個有效的資料庫連線字串</param>
/// <param name="commandType">命令型別 (儲存過程,命令文字或其它)</param>
/// <param name="commandText">儲存過程名或T-SQL語句</param>
/// <returns>返回包含結果集的SqlDataReader</returns>
public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText)
{
return ExecuteReader(connectionString, commandType, commandText, (SqlParameter[])null);
}
/// <summary>
/// 執行指定資料庫連線字串的資料閱讀器,指定引數.
/// </summary>
/// <remarks>
/// 示例:
/// SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString">一個有效的資料庫連線字串</param>
/// <param name="commandType">命令型別 (儲存過程,命令文字或其它)</param>
/// <param name="commandText">儲存過程名或T-SQL語句</param>
/// <param name="commandParameters">SqlParamter引數陣列(new SqlParameter("@prodid", 24))</param>
/// <returns>返回包含結果集的SqlDataReader</returns>
public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
SqlConnection connection = null;
try
{
connection = new SqlConnection(connectionString);
connection.Open();
return ExecuteReader(connection, null, commandType, commandText, commandParameters, SqlConnectionOwnership.Internal);
}
catch
{
// If we fail to return the SqlDatReader, we need to close the connection ourselves
if (connection != null) connection.Close();
throw;
}
}
/// <summary>
/// 執行指定資料庫連線字串的資料閱讀器,指定引數值.
/// </summary>
/// <remarks>
/// 此方法不提供訪問儲存過程輸出引數和返回值引數.
/// 示例:
/// SqlDataReader dr = ExecuteReader(connString, "GetOrders", 24, 36);
/// </remarks>
/// <param name="connectionString">一個有效的資料庫連線字串</param>
/// <param name="spName">儲存過程名</param>
/// <param name="parameterValues">分配給儲存過程輸入引數的物件陣列</param>
/// <returns>返回包含結果集的SqlDataReader</returns>
public static SqlDataReader ExecuteReader(string connectionString, string spName, params object[] parameterValues)
{
if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
if ((parameterValues != null) && (parameterValues.Length > 0))
{
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
AssignParameterValues(commandParameters, parameterValues);
return ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 執行指定資料庫連線物件的資料閱讀器.
/// </summary>
/// <remarks>
/// 示例:
/// SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="connection">一個有效的資料庫連線物件</param>
/// <param name="commandType">命令型別 (儲存過程,命令文字或其它)</param>
/// <param name="commandText">儲存過程名或T-SQL語句</param>
/// <returns>返回包含結果集的SqlDataReader</returns>
public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText)
{
return ExecuteReader(connection, commandType, commandText, (SqlParameter[])null);
}
/// <summary>
/// [呼叫者方式]執行指定資料庫連線物件的資料閱讀器,指定引數.
/// </summary>
/// <remarks>
/// 示例:
/// SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connection">一個有效的資料庫連線物件</param>
/// <param name="commandType">命令型別 (儲存過程,命令文字或其它)</param>
/// <param name="commandText">命令型別 (儲存過程,命令文字或其它)</param>
/// <param name="commandParameters">SqlParamter引數陣列</param>
/// <returns>返回包含結果集的SqlDataReader</returns>
public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
return ExecuteReader(connection, (SqlTransaction)null, commandType, commandText, commandParameters, SqlConnectionOwnership.External);
}
/// <summary>
/// [呼叫者方式]執行指定資料庫連線物件的資料閱讀器,指定引數值.
/// </summary>
/// <remarks>
/// 此方法不提供訪問儲存過程輸出引數和返回值引數.
/// 示例:
/// SqlDataReader dr = ExecuteReader(conn, "GetOrders", 24, 36);
/// </remarks>
/// <param name="connection">一個有效的資料庫連線物件</param>
/// <param name="spName">T儲存過程名</param>
/// <param name="parameterValues">分配給儲存過程輸入引數的物件陣列</param>
/// <returns>返回包含結果集的SqlDataReader</returns>
public static SqlDataReader ExecuteReader(SqlConnection connection, string spName, params object[] parameterValues)
{
if (connection == null) throw new ArgumentNullException("connection");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
if ((parameterValues != null) && (parameterValues.Length > 0))
{
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
AssignParameterValues(commandParameters, parameterValues);
return ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
return ExecuteReader(connection, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// [呼叫者方式]執行指定資料庫事務的資料閱讀器,指定引數值.
/// </summary>
/// <remarks>
/// 示例:
/// SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="transaction">一個有效的連線事務</param>
/// <param name="commandType">命令型別 (儲存過程,命令文字或其它)</param>
/// <param name="commandText">儲存過程名稱或T-SQL語句</param>
/// <returns>返回包含結果集的SqlDataReader</returns>
public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText)
{
return ExecuteReader(transaction, commandType, commandText, (SqlParameter[])null);
}
/// <summary>
/// [呼叫者方式]執行指定資料庫事務的資料閱讀器,指定引數.
/// </summary>
/// <remarks>
/// 示例:
/// SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="transaction">一個有效的連線事務</param>
/// <param name="commandType">命令型別 (儲存過程,命令文字或其它)</param>
/// <param name="commandText">儲存過程名稱或T-SQL語句</param>
/// <param name="commandParameters">分配給命令的SqlParamter引數陣列</param>
/// <returns>返回包含結果集的SqlDataReader</returns>
public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (transaction == null) throw new ArgumentNullException("transaction");
if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
return ExecuteReader(transaction.Connection, transaction, commandType, commandText, commandParameters, SqlConnectionOwnership.External);
}
/// <summary>
/// [呼叫者方式]執行指定資料庫事務的資料閱讀器,指定引數值.
/// </summary>
/// <remarks>
/// 此方法不提供訪問儲存過程輸出引數和返回值引數.
///
/// 示例:
/// SqlDataReader dr = ExecuteReader(trans, "GetOrders", 24, 36);
/// </remarks>
/// <param name="transaction">一個有效的連線事務</param>
/// <param name="spName">儲存過程名稱</param>
/// <param name="parameterValues">分配給儲存過程輸入引數的物件陣列</param>
/// <returns>返回包含結果集的SqlDataReader</returns>
public static SqlDataReader ExecuteReader(SqlTransaction transaction, string spName, params object[] parameterValues)
{
if (transaction == null) throw new ArgumentNullException("transaction");
if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
// 如果有引數值
if ((parameterValues != null) && (parameterValues.Length > 0))
{
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
AssignParameterValues(commandParameters, parameterValues);
return ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
// 沒有引數值
return ExecuteReader(transaction, CommandType.StoredProcedure, spName);
}
}
#endregion ExecuteReader資料閱讀器
#region ExecuteScalar 返回結果集中的第一行第一列
/// <summary>
/// 執行指定資料庫連線字串的命令,返回結果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 示例:
/// int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount");
/// </remarks>
/// <param name="connectionString">一個有效的資料庫連線字串</param>
/// <param name="commandType">命令型別 (儲存過程,命令文字或其它)</param>
/// <param name="commandText">儲存過程名稱或T-SQL語句</param>
/// <returns>返回結果集中的第一行第一列</returns>
public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText)
{
// 執行引數為空的方法
return ExecuteScalar(connectionString, commandType, commandText, (SqlParameter[])null);
}
/// <summary>
/// 執行指定資料庫連線字串的命令,指定引數,返回結果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 示例:
/// int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connectionString">一個有效的資料庫連線字串</param>
/// <param name="commandType">命令型別 (儲存過程,命令文字或其它)</param>
/// <param name="commandText">儲存過程名稱或T-SQL語句</param>
/// <param name="commandParameters">分配給命令的SqlParamter引數陣列</param>
/// <returns>返回結果集中的第一行第一列</returns>
public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
// 建立並開啟資料庫連線物件,操作完成釋放物件.
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();
// 呼叫指定資料庫連線字串過載方法.
return ExecuteScalar(connection, commandType, commandText, commandParameters);
}
}
/// <summary>
/// 執行指定資料庫連線字串的命令,指定引數值,返回結果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 此方法不提供訪問儲存過程輸出引數和返回值引數.
///
/// 示例:
/// int orderCount = (int)ExecuteScalar(connString, "GetOrderCount", 24, 36);
/// </remarks>
/// <param name="connectionString">一個有效的資料庫連線字串</param>
/// <param name="spName">儲存過程名稱</param>
/// <param name="parameterValues">分配給儲存過程輸入引數的物件陣列</param>
/// <returns>返回結果集中的第一行第一列</returns>
public static object ExecuteScalar(string connectionString, string spName, params object[] parameterValues)
{
if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
// 如果有引數值
if ((parameterValues != null) && (parameterValues.Length > 0))
{
// 從快取中載入儲存過程引數,如果快取中不存在則從資料庫中檢索引數資訊並載入到快取中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
// 給儲存過程引數賦值
AssignParameterValues(commandParameters, parameterValues);
// 呼叫過載方法
return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
// 沒有引數值
return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 執行指定資料庫連線物件的命令,返回結果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 示例:
/// int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount");
/// </remarks>
/// <param name="connection">一個有效的資料庫連線物件</param>
/// <param name="commandType">命令型別 (儲存過程,命令文字或其它)</param>
/// <param name="commandText">儲存過程名稱或T-SQL語句</param>
/// <returns>返回結果集中的第一行第一列</returns>
public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText)
{
// 執行引數為空的方法
return ExecuteScalar(connection, commandType, commandText, (SqlParameter[])null);
}
/// <summary>
/// 執行指定資料庫連線物件的命令,指定引數,返回結果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 示例:
/// int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connection">一個有效的資料庫連線物件</param>
/// <param name="commandType">命令型別 (儲存過程,命令文字或其它)</param>
/// <param name="commandText">儲存過程名稱或T-SQL語句</param>
/// <param name="commandParameters">分配給命令的SqlParamter引數陣列</param>
/// <returns>返回結果集中的第一行第一列</returns>
public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connection == null) throw new ArgumentNullException("connection");
// 建立SqlCommand命令,並進行預處理
SqlCommand cmd = new SqlCommand();
bool mustCloseConnection = false;
PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);
// 執行SqlCommand命令,並返回結果.
object retval = cmd.ExecuteScalar();
// 清除引數,以便再次使用.
cmd.Parameters.Clear();
if (mustCloseConnection)
connection.Close();
return retval;
}
/// <summary>
/// 執行指定資料庫連線物件的命令,指定引數值,返回結果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 此方法不提供訪問儲存過程輸出引數和返回值引數.
///
/// 示例:
/// int orderCount = (int)ExecuteScalar(conn, "GetOrderCount", 24, 36);
/// </remarks>
/// <param name="connection">一個有效的資料庫連線物件</param>
/// <param name="spName">儲存過程名稱</param>
/// <param name="parameterValues">分配給儲存過程輸入引數的物件陣列</param>
/// <returns>返回結果集中的第一行第一列</returns>
public static object ExecuteScalar(SqlConnection connection, string spName, params object[] parameterValues)
{
if (connection == null) throw new ArgumentNullException("connection");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
// 如果有引數值
if ((parameterValues != null) && (parameterValues.Length > 0))
{
// 從快取中載入儲存過程引數,如果快取中不存在則從資料庫中檢索引數資訊並載入到快取中. ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
// 給儲存過程引數賦值
AssignParameterValues(commandParameters, parameterValues);
// 呼叫過載方法
return ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
// 沒有引數值
return ExecuteScalar(connection, CommandType.StoredProcedure, spName);
}
}
/// <summary>
/// 執行指定資料庫事務的命令,返回結果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 示例:
/// int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount");
/// </remarks>
/// <param name="transaction">一個有效的連線事務</param>
/// <param name="commandType">命令型別 (儲存過程,命令文字或其它)</param>
/// <param name="commandText">儲存過程名稱或T-SQL語句</param>
/// <returns>返回結果集中的第一行第一列</returns>
public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText)
{
// 執行引數為空的方法
return ExecuteScalar(transaction, commandType, commandText, (SqlParameter[])null);
}
/// <summary>
/// 執行指定資料庫事務的命令,指定引數,返回結果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 示例:
/// int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="transaction">一個有效的連線事務</param>
/// <param name="commandType">命令型別 (儲存過程,命令文字或其它)</param>
/// <param name="commandText">儲存過程名稱或T-SQL語句</param>
/// <param name="commandParameters">分配給命令的SqlParamter引數陣列</param>
/// <returns>返回結果集中的第一行第一列</returns>
public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (transaction == null) throw new ArgumentNullException("transaction");
if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
// 建立SqlCommand命令,並進行預處理
SqlCommand cmd = new SqlCommand();
bool mustCloseConnection = false;
PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);
// 執行SqlCommand命令,並返回結果.
object retval = cmd.ExecuteScalar();
// 清除引數,以便再次使用.
cmd.Parameters.Clear();
return retval;
}
/// <summary>
/// 執行指定資料庫事務的命令,指定引數值,返回結果集中的第一行第一列.
/// </summary>
/// <remarks>
/// 此方法不提供訪問儲存過程輸出引數和返回值引數.
///
/// 示例:
/// int orderCount = (int)ExecuteScalar(trans, "GetOrderCount", 24, 36);
/// </remarks>
/// <param name="transaction">一個有效的連線事務</param>
/// <param name="spName">儲存過程名稱</param>
/// <param name="parameterValues">分配給儲存過程輸入引數的物件陣列</param>
/// <returns>返回結果集中的第一行第一列</returns>
public static object ExecuteScalar(SqlTransaction transaction, string spName, params object[] parameterValues)
{
if (transaction == null) throw new ArgumentNullException("transaction");
if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");
// 如果有引數值
if ((parameterValues != null) && (parameterValues.Length > 0))
{
// PPull the parameters for this stored procedure from the parameter cache ()
SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
// 給儲存過程引數賦值
AssignParameterValues(commandParameters, parameterValues);
// 呼叫過載方法
return ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
}
else
{
// 沒有引數值
return ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
}
}
#endregion ExecuteScalar
#region ExecuteXmlReader XML閱讀器
/// <summary>
/// 執行指定資料庫連線物件的SqlCommand命令,併產生一個XmlReader物件做為結果集返回.
/// </summary>
/// <remarks>
/// 示例:
/// XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders");
/// </remarks>
/// <param name="connection">一個有效的資料庫連線物件</param>
/// <param name="commandType">命令型別 (儲存過程,命令文字或其它)</param>
/// <param name="commandText">儲存過程名稱或T-SQL語句 using "FOR XML AUTO"</param>
/// <returns>返回XmlReader結果集物件.</returns>
public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText)
{
// 執行引數為空的方法
return ExecuteXmlReader(connection, commandType, commandText, (SqlParameter[])null);
}
/// <summary>
/// 執行指定資料庫連線物件的SqlCommand命令,併產生一個XmlReader物件做為結果集返回,指定引數.
/// </summary>
/// <remarks>
/// 示例:
/// XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
/// </remarks>
/// <param name="connection">一個有效的資料庫連線物件</param>
/// <param name="commandType">命令型別 (儲存過程,命令文字或其它)</param>
/// <param name="commandText">儲存過程名稱或T-SQL語句 using "FOR XML AUTO"</param>
/// <param name="commandParameters">分配給命令的SqlParamter引數陣列</param>
/// <returns>返回XmlReader結果集物件.</returns>
public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
{
if (connection == null) throw new ArgumentNullException("connection");
bool mustCloseConnection = false;
// 建立SqlCommand命令,並進行預處理
SqlCommand cmd =