using System; using System.Data; using System.Configuration; using System.Web; using System.Web.Security; using System.Collections; using System.Data.SqlClient; /// <summary> /// 數(shù)據(jù)庫的通用訪問代碼 /// 此類為抽象類，不允許實(shí)例化，在應(yīng)用時(shí)直接調(diào)用即可 /// </summary> public abstract class SqlHelper { ????//獲取數(shù)據(jù)庫連接字符串，其屬于靜態(tài)變量且只讀，項(xiàng)目中所有文檔可以直接使用，但不能修改 ????public static readonly string ConnectionStringLocalTransaction = ConfigurationManager.ConnectionStrings["pubsConnectionString"].ConnectionString; ????// 哈希表用來存儲(chǔ)緩存的參數(shù)信息，哈希表可以存儲(chǔ)任意類型的參數(shù)。 ????private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable()); ????/// <summary> ????///執(zhí)行一個(gè)不需要返回值的SqlCommand命令，通過指定專用的連接字符串。 ????/// 使用參數(shù)數(shù)組形式提供參數(shù)列表 ????/// </summary> ????/// <remarks> ????/// 使用示例： ????///? int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24)); ????/// </remarks> ????/// <param name="connectionString">一個(gè)有效的數(shù)據(jù)庫連接字符串</param> ????/// <param name="commandType">SqlCommand命令類型 (存儲(chǔ)過程， T-SQL語句， 等等。)</param> ????/// <param name="commandText">存儲(chǔ)過程的名字或者 T-SQL 語句</param> ????/// <param name="commandParameters">以數(shù)組形式提供SqlCommand命令中用到的參數(shù)列表</param> ????/// <returns>返回一個(gè)數(shù)值表示此SqlCommand命令執(zhí)行后影響的行數(shù)</returns> ????public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters) ????{ ????????SqlCommand cmd = new SqlCommand(); ????????using (SqlConnection conn = new SqlConnection(connectionString)) ????????{ ????????????//通過PrePareCommand方法將參數(shù)逐個(gè)加入到SqlCommand的參數(shù)集合中 ????????????PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters); ????????????int val = cmd.ExecuteNonQuery(); ????????????//清空SqlCommand中的參數(shù)列表 ????????????cmd.Parameters.Clear(); ????????????return val; ????????} ????} ????? ????/// <summary> ????///執(zhí)行一條不返回結(jié)果的SqlCommand，通過一個(gè)已經(jīng)存在的數(shù)據(jù)庫連接 ????/// 使用參數(shù)數(shù)組提供參數(shù) ????/// </summary> ????/// <remarks> ????/// 使用示例：? ????///? int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24)); ????/// </remarks> ????/// <param name="conn">一個(gè)現(xiàn)有的數(shù)據(jù)庫連接</param> ????/// <param name="commandType">SqlCommand命令類型 (存儲(chǔ)過程， T-SQL語句， 等等。)</param> ????/// <param name="commandText">存儲(chǔ)過程的名字或者 T-SQL 語句</param> ????/// <param name="commandParameters">以數(shù)組形式提供SqlCommand命令中用到的參數(shù)列表</param> ????/// <returns>返回一個(gè)數(shù)值表示此SqlCommand命令執(zhí)行后影響的行數(shù)</returns> ????public static int ExecuteNonQuery(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters) ????{ ????????SqlCommand cmd = new SqlCommand(); ????????PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters); ????????int val = cmd.ExecuteNonQuery(); ????????cmd.Parameters.Clear(); ????????return val; ????} ????/// <summary> ????/// 執(zhí)行一條不返回結(jié)果的SqlCommand，通過一個(gè)已經(jīng)存在的數(shù)據(jù)庫事物處理 ????/// 使用參數(shù)數(shù)組提供參數(shù) ????/// </summary> ????/// <remarks> ????/// 使用示例： ????///? int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24)); ????/// </remarks> ????/// <param name="trans">一個(gè)存在的 sql 事物處理</param> ????/// <param name="commandType">SqlCommand命令類型 (存儲(chǔ)過程， T-SQL語句， 等等。)</param> ????/// <param name="commandText">存儲(chǔ)過程的名字或者 T-SQL 語句</param> ????/// <param name="commandParameters">以數(shù)組形式提供SqlCommand命令中用到的參數(shù)列表</param> ????/// <returns>返回一個(gè)數(shù)值表示此SqlCommand命令執(zhí)行后影響的行數(shù)</returns> ????public static int ExecuteNonQuery(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters) ????{ ????????SqlCommand cmd = new SqlCommand(); ????????PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters); ????????int val = cmd.ExecuteNonQuery(); ????????cmd.Parameters.Clear(); ????????return val; ????} ????/// <summary> ????/// 執(zhí)行一條返回結(jié)果集的SqlCommand命令，通過專用的連接字符串。 ????/// 使用參數(shù)數(shù)組提供參數(shù) ????/// </summary> ????/// <remarks> ????/// 使用示例：? ????///? SqlDataReader r = ExecuteReader(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24)); ????/// </remarks> ????/// <param name="connectionString">一個(gè)有效的數(shù)據(jù)庫連接字符串</param> ????/// <param name="commandType">SqlCommand命令類型 (存儲(chǔ)過程， T-SQL語句， 等等。)</param> ????/// <param name="commandText">存儲(chǔ)過程的名字或者 T-SQL 語句</param> ????/// <param name="commandParameters">以數(shù)組形式提供SqlCommand命令中用到的參數(shù)列表</param> ????/// <returns>返回一個(gè)包含結(jié)果的SqlDataReader</returns> ????public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters) ????{ ????????SqlCommand cmd = new SqlCommand(); ????????SqlConnection conn = new SqlConnection(connectionString); ????????// 在這里使用try/catch處理是因?yàn)槿绻椒ǔ霈F(xiàn)異常，則SqlDataReader就不存在， ????????//CommandBehavior.CloseConnection的語句就不會(huì)執(zhí)行，觸發(fā)的異常由catch捕獲。 ????????//關(guān)閉數(shù)據(jù)庫連接，并通過throw再次引發(fā)捕捉到的異常。 ????????try ????????{ ????????????PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters); ????????????SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection); ????????????cmd.Parameters.Clear(); ????????????return rdr; ????????} ????????catch ????????{ ????????????conn.Close(); ????????????throw; ????????} ????} ????/// <summary> ????/// 執(zhí)行一條返回第一條記錄第一列的SqlCommand命令，通過專用的連接字符串。 ????/// 使用參數(shù)數(shù)組提供參數(shù) ????/// </summary> ????/// <remarks> ????/// 使用示例：? ????///? Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24)); ????/// </remarks> ????/// <param name="connectionString">一個(gè)有效的數(shù)據(jù)庫連接字符串</param> ????/// <param name="commandType">SqlCommand命令類型 (存儲(chǔ)過程， T-SQL語句， 等等。)</param> ????/// <param name="commandText">存儲(chǔ)過程的名字或者 T-SQL 語句</param> ????/// <param name="commandParameters">以數(shù)組形式提供SqlCommand命令中用到的參數(shù)列表</param> ????/// <returns>返回一個(gè)object類型的數(shù)據(jù)，可以通過 Convert.To{Type}方法轉(zhuǎn)換類型</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> ????/// 執(zhí)行一條返回第一條記錄第一列的SqlCommand命令，通過已經(jīng)存在的數(shù)據(jù)庫連接。 ????/// 使用參數(shù)數(shù)組提供參數(shù) ????/// </summary> ????/// <remarks> ????/// 使用示例： ????///? Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24)); ????/// </remarks> ????/// <param name="conn">一個(gè)已經(jīng)存在的數(shù)據(jù)庫連接</param> ????/// <param name="commandType">SqlCommand命令類型 (存儲(chǔ)過程， T-SQL語句， 等等。)</param> ????/// <param name="commandText">存儲(chǔ)過程的名字或者 T-SQL 語句</param> ????/// <param name="commandParameters">以數(shù)組形式提供SqlCommand命令中用到的參數(shù)列表</param> ????/// <returns>返回一個(gè)object類型的數(shù)據(jù)，可以通過 Convert.To{Type}方法轉(zhuǎn)換類型</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; ????} ????/// <summary> ????/// 緩存參數(shù)數(shù)組 ????/// </summary> ????/// <param name="cacheKey">參數(shù)緩存的鍵值</param> ????/// <param name="cmdParms">被緩存的參數(shù)列表</param> ????public static void CacheParameters(string cacheKey, params SqlParameter[] commandParameters) ????{ ????????parmCache[cacheKey] = commandParameters; ????} ????/// <summary> ????/// 獲取緩存的參數(shù) ????/// </summary> ????/// <param name="cacheKey">用于查找參數(shù)的Key值</param> ????/// <returns>返回緩存的參數(shù)數(shù)組</returns> ????public static SqlParameter[] GetCachedParameters(string cacheKey) ????{ ????????SqlParameter[] cachedParms = (SqlParameter[])parmCache[cacheKey]; ????????if (cachedParms == null) ????????????return null; ????????//新建一個(gè)參數(shù)的復(fù)制列表 ????????SqlParameter[] clonedParms = new SqlParameter[cachedParms.Length]; ????????//通過循環(huán)為克隆參數(shù)列表賦值 ????????for (int i = 0, j = cachedParms.Length; i < j; i++) ????????????//使用clone方法復(fù)制參數(shù)列表中的參數(shù) ????????????clonedParms[i] = (SqlParameter)((ICloneable)cachedParms[i]).Clone(); ????????return clonedParms; ????} ????/// <summary> ????/// 為執(zhí)行命令準(zhǔn)備參數(shù) ????/// </summary> ????/// <param name="cmd">SqlCommand 命令</param> ????/// <param name="conn">已經(jīng)存在的數(shù)據(jù)庫連接</param> ????/// <param name="trans">數(shù)據(jù)庫事物處理</param> ????/// <param name="cmdType">SqlCommand命令類型 (存儲(chǔ)過程， T-SQL語句， 等等。)</param> ????/// <param name="cmdText">Command text，T-SQL語句 例如 Select * from Products</param> ????/// <param name="cmdParms">返回帶參數(shù)的命令</param> ????private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, string cmdText, SqlParameter[] cmdParms) ????{ ????????//判斷數(shù)據(jù)庫連接狀態(tài) ????????if (conn.State != ConnectionState.Open) ????????????conn.Open(); ????????cmd.Connection = conn; ????????cmd.CommandText = cmdText; ????????//判斷是否需要事物處理 ????????if (trans != null) ????????????cmd.Transaction = trans; ????????cmd.CommandType = cmdType; ????????if (cmdParms != null) ????????{ ????????????foreach (SqlParameter parm in cmdParms) ????????????????cmd.Parameters.Add(parm); ????????} ????} }

轉(zhuǎn)載于:https://www.cnblogs.com/wnntechnology/p/5523997.html

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