最新的SqlHelper 类

代码 Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->using System; using System.Collections.Generic; using System.Text; using System.Data; using System.Data.SqlClient; using System.Collections;namespace SystemDAO {/// <summary>/// 数据库的通用访问代码 苏飞修改/// /// 此类为抽象类，/// 不允许实例化，在应用时直接调用即可/// </summary>public abstract class SqlHelper{/// <summary>/// 数据库连接字符串/// </summary>public static readonly string connectionString = System.Configuration.ConfigurationSettings.AppSettings["con"].ToString().Trim();// Hashtable to store cached parametersprivate static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());#region//ExecteNonQuery方法/// <summary>///执行一个不需要返回值的SqlCommand命令，通过指定专用的连接字符串。/// 使用参数数组形式提供参数列表 /// </summary>/// <param name="connectionString">一个有效的数据库连接字符串</param>/// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>/// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>/// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>public static int ExecteNonQuery(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters){SqlCommand cmd = new SqlCommand();using (SqlConnection conn = new SqlConnection(connectionString)){//通过PrePareCommand方法将参数逐个加入到SqlCommand的参数集合中PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);int val = cmd.ExecuteNonQuery();//清空SqlCommand中的参数列表cmd.Parameters.Clear();return val;}}/// <summary>///执行一个不需要返回值的SqlCommand命令，通过指定专用的连接字符串。/// 使用参数数组形式提供参数列表 /// </summary>/// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>/// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>/// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>public static int ExecteNonQuery(CommandType cmdType, string cmdText, params SqlParameter[] commandParameters){return ExecteNonQuery(connectionString ,cmdType, cmdText, commandParameters);}/// <summary>///存储过程专用/// </summary>/// <param name="cmdText">存储过程的名字</param>/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>/// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>public static int ExecteNonQueryProducts(string cmdText, params SqlParameter[] commandParameters){return ExecteNonQuery(CommandType.StoredProcedure, cmdText, commandParameters);}/// <summary>///Sql语句专用/// </summary>/// <param name="cmdText">T_Sql语句</param>/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>/// <returns>返回一个数值表示此SqlCommand命令执行后影响的行数</returns>public static int ExecteNonQueryText(string cmdText, params SqlParameter[] commandParameters){return ExecteNonQuery(CommandType.Text, cmdText, commandParameters);}#endregion#region//GetTable方法/// <summary>/// 执行一条返回结果集的SqlCommand，通过一个已经存在的数据库连接/// 使用参数数组提供参数/// </summary>/// <param name="connecttionString">一个现有的数据库连接</param>/// <param name="cmdTye">SqlCommand命令类型</param>/// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>/// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns>public static DataTableCollection GetTable(string connecttionString, CommandType cmdTye, string cmdText, SqlParameter[] commandParameters){SqlCommand cmd = new SqlCommand();DataSet ds = new DataSet();using (SqlConnection conn = new SqlConnection(connecttionString)){PrepareCommand(cmd, conn, null, cmdTye, cmdText, commandParameters);SqlDataAdapter adapter = new SqlDataAdapter();adapter.SelectCommand = cmd;adapter.Fill(ds);}DataTableCollection table = ds.Tables;return table;}/// <summary>/// 执行一条返回结果集的SqlCommand，通过一个已经存在的数据库连接/// 使用参数数组提供参数/// </summary>/// <param name="cmdTye">SqlCommand命令类型</param>/// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>/// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns>public static DataTableCollection GetTable(CommandType cmdTye, string cmdText, SqlParameter[] commandParameters){return GetTable(cmdTye, cmdText, commandParameters);}/// <summary>/// 存储过程专用/// </summary>/// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>/// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns>public static DataTableCollection GetTableProducts(string cmdText, SqlParameter[] commandParameters){return GetTable(CommandType.StoredProcedure, cmdText, commandParameters);}/// <summary>/// Sql语句专用/// </summary>/// <param name="cmdText"> T-SQL 语句</param>/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>/// <returns>返回一个表集合(DataTableCollection)表示查询得到的数据集</returns>public static DataTableCollection GetTableText(string cmdText, SqlParameter[] commandParameters){return GetTable(CommandType.Text, cmdText, commandParameters);}#endregion/// <summary>/// 为执行命令准备参数/// </summary>/// <param name="cmd">SqlCommand 命令</param>/// <param name="conn">已经存在的数据库连接</param>/// <param name="trans">数据库事物处理</param>/// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>/// <param name="cmdText">Command text，T-SQL语句 例如 Select * from Products</param>/// <param name="cmdParms">返回带参数的命令</param>private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms){//判断数据库连接状态if (conn.State != ConnectionState.Open)conn.Open();cmd.Connection = conn;cmd.CommandText = cmdText;//判断是否需要事物处理if (trans != null)cmd.Transaction = trans;cmd.CommandType = cmdType;if (cmdParms != null){foreach (SqlParameter parm in cmdParms)cmd.Parameters.Add(parm);}}/// <summary>/// Execute a SqlCommand that returns a resultset against the database specified in the connection string /// using the provided parameters./// </summary>/// <param name="connectionString">一个有效的数据库连接字符串</param>/// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>/// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>/// <returns>A SqlDataReader containing the results</returns>public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters){SqlCommand cmd = new SqlCommand();SqlConnection conn = new SqlConnection(connectionString);// we use a try/catch here because if the method throws an exception we want to // close the connection throw code, because no datareader will exist, hence the // commandBehaviour.CloseConnection will not worktry{PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);cmd.Parameters.Clear();return rdr;}catch{conn.Close();throw;}}#region//ExecuteDataSet方法/// <summary>/// return a dataset/// </summary>/// <param name="connectionString">一个有效的数据库连接字符串</param>/// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>/// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>/// <returns>return a dataset</returns>public static DataSet ExecuteDataSet(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters){SqlConnection conn = new SqlConnection(connectionString);SqlCommand cmd = new SqlCommand();try{PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);SqlDataAdapter da = new SqlDataAdapter();DataSet ds = new DataSet();da.SelectCommand = cmd;da.Fill(ds);return ds;}catch{conn.Close();throw;}}/// <summary>/// 返回一个DataSet/// </summary>/// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>/// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>/// <returns>return a dataset</returns>public static DataSet ExecuteDataSet(CommandType cmdType, string cmdText, params SqlParameter[] commandParameters){return ExecuteDataSet(connectionString, cmdType, cmdText, commandParameters);}/// <summary>/// 返回一个DataSet/// </summary>/// <param name="cmdText">存储过程的名字</param>/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>/// <returns>return a dataset</returns>public static DataSet ExecuteDataSetProducts(string cmdText, params SqlParameter[] commandParameters){return ExecuteDataSet(connectionString, CommandType.StoredProcedure, cmdText, commandParameters);}/// <summary>/// 返回一个DataSet/// </summary>/// <param name="cmdText">T-SQL 语句</param>/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>/// <returns>return a dataset</returns>public static DataSet ExecuteDataSetText(string cmdText, params SqlParameter[] commandParameters){return ExecuteDataSet(connectionString, CommandType.Text, cmdText, commandParameters);}public static DataView ExecuteDataSet(string connectionString, string sortExpression, string direction, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters){SqlConnection conn = new SqlConnection(connectionString);SqlCommand cmd = new SqlCommand();try{PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);SqlDataAdapter da = new SqlDataAdapter();DataSet ds = new DataSet();da.SelectCommand = cmd;da.Fill(ds);DataView dv = ds.Tables[0].DefaultView;dv.Sort = sortExpression + " " + direction;return dv;}catch{conn.Close();throw;}}#endregion#region // ExecuteScalar方法/// <summary>/// 返回第一行的第一列/// </summary>/// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>/// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>/// <returns>返回一个对象</returns>public static object ExecuteScalar(CommandType cmdType, string cmdText, params SqlParameter[] commandParameters){return ExecuteScalar(SqlHelper.connectionString, cmdType, cmdText, commandParameters);}/// <summary>/// 返回第一行的第一列存储过程专用/// </summary>/// <param name="cmdText">存储过程的名字</param>/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>/// <returns>返回一个对象</returns>public static object ExecuteScalarProducts(string cmdText, params SqlParameter[] commandParameters){return ExecuteScalar(SqlHelper.connectionString, CommandType.StoredProcedure, cmdText, commandParameters);}/// <summary>/// 返回第一行的第一列Sql语句专用/// </summary>/// <param name="cmdText">者 T-SQL 语句</param>/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>/// <returns>返回一个对象</returns>public static object ExecuteScalarText(string cmdText, params SqlParameter[] commandParameters){return ExecuteScalar(SqlHelper.connectionString, CommandType.Text, cmdText, commandParameters);}/// <summary>/// Execute a SqlCommand that returns the first column of the first record against the database specified in the connection string /// using the provided parameters./// </summary>/// <remarks>/// e.g.: /// Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));/// </remarks>/// <param name="connectionString">一个有效的数据库连接字符串</param>/// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>/// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>/// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters){SqlCommand cmd = new SqlCommand();using (SqlConnection connection = new SqlConnection(connectionString)){PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);object val = cmd.ExecuteScalar();cmd.Parameters.Clear();return val;}}/// <summary>/// Execute a SqlCommand that returns the first column of the first record against an existing database connection /// using the provided parameters./// </summary>/// <remarks>/// e.g.: /// Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));/// </remarks>/// <param name="connectionString">一个有效的数据库连接字符串</param>/// <param name="cmdType">SqlCommand命令类型 (存储过程， T-SQL语句， 等等。)</param>/// <param name="cmdText">存储过程的名字或者 T-SQL 语句</param>/// <param name="commandParameters">以数组形式提供SqlCommand命令中用到的参数列表</param>/// <returns>An object that should be converted to the expected type using Convert.To{Type}</returns>public static object ExecuteScalar(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters){SqlCommand cmd = new SqlCommand();PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);object val = cmd.ExecuteScalar();cmd.Parameters.Clear();return val;}#endregion/// <summary>/// add parameter array to the cache/// </summary>/// <param name="cacheKey">Key to the parameter cache</param>/// <param name="cmdParms">an array of SqlParamters to be cached</param>public static void CacheParameters(string cacheKey, params SqlParameter[] commandParameters){parmCache[cacheKey] = commandParameters;}/// <summary>/// Retrieve cached parameters/// </summary>/// <param name="cacheKey">key used to lookup parameters</param>/// <returns>Cached SqlParamters array</returns>public static SqlParameter[] GetCachedParameters(string cacheKey){SqlParameter[] cachedParms = (SqlParameter[])parmCache[cacheKey];if (cachedParms == null)return null;SqlParameter[] clonedParms = new SqlParameter[cachedParms.Length];for (int i = 0, j = cachedParms.Length; i < j; i++)clonedParms[i] = (SqlParameter)((ICloneable)cachedParms[i]).Clone();return clonedParms;}/// <summary>/// 检查是否存在/// </summary>/// <param name="strSql">Sql语句</param>/// <returns>bool结果</returns>public static bool Exists(string strSql){int cmdresult = Convert.ToInt32(ExecuteScalar(connectionString, CommandType.Text, strSql, null));if (cmdresult == 0){return false;}else{return true;}}/// <summary>/// 检查是否存在/// </summary>/// <param name="strSql">Sql语句</param>/// <param name="cmdParms">参数</param>/// <returns>bool结果</returns>public static bool Exists(string strSql, params SqlParameter[] cmdParms){int cmdresult = Convert.ToInt32(ExecuteScalar(connectionString, CommandType.Text, strSql, cmdParms));if (cmdresult == 0){return false;}else{return true;}}}}

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