SqlHelper 類

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using System;

using System.Collections.Generic;

using System.Text;

using System.Data.SqlClient;

using System.Collections;

using System.Data;

using System.Configuration;

using System.Web; 

/// <summary>

/// SqlHelper 的摘要說明

/// </summary>

public class SqlHelper

{

    private static readonly string connectionString = ConfigurationManager.ConnectionStrings["DataBaseString"].ConnectionString;

    public SqlHelper()  

    {  

    } 

    #region 公用方法  

    public static int GetMaxID(string FieldName, string TableName)  

        string strsql = "select max(" + FieldName + ")+1 from " + TableName;  

        object obj = SqlHelper.GetSingle(strsql);  

        if (obj == null)  

        {  

            return 1;  

        }  

        else 

            return int.Parse(obj.ToString());  

    }  

    public static bool Exists(string strSql)  

        object obj = SqlHelper.GetSingle(strSql);  

        int cmdresult;  

        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))  

            cmdresult = 0;  

            cmdresult = int.Parse(obj.ToString());  

        if (cmdresult == 0)  

            return false;  

            return true;  

    public static bool Exists(string strSql, params SqlParameter[] cmdParms)  

        object obj = SqlHelper.GetSingle(strSql, cmdParms);  

    #endregion 

    #region  執行簡單SQL語句  

    /// <summary>  

    /// 執行SQL語句，傳回影響的記錄數  

    /// </summary>  

    /// <param name="SQLString">SQL語句</param>  

    /// <returns>影響的記錄數</returns>  

    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 new Exception(E.Message);  

            }  

    /// 執行SQL語句，傳回影響的記錄數 适用于select語句  

    public static int ExecuteSql2(string SQLString)  

                    int rows = Convert.ToInt32(cmd.ExecuteScalar());  

    /// 執行多條SQL語句，實作資料庫事務。  

    /// <param name="SQLStringList">多條SQL語句</param>       

    public static void ExecuteSqlTran(ArrayList SQLStringList)  

        using (SqlConnection conn = new SqlConnection(connectionString))  

            conn.Open();  

            SqlCommand cmd = new SqlCommand();  

            cmd.Connection = conn;  

            SqlTransaction tx = conn.BeginTransaction();  

            cmd.Transaction = tx;  

            try 

                for (int n = 0; n < SQLStringList.Count; n++)  

                    string strsql = SQLStringList[n].ToString();  

                    if (strsql.Trim().Length > 1)  

                    {  

                        cmd.CommandText = strsql;  

                        cmd.ExecuteNonQuery();  

                    }  

                tx.Commit();  

            catch (System.Data.SqlClient.SqlException E)  

                tx.Rollback();  

                throw new Exception(E.Message);  

    /// 執行帶一個存儲過程參數的的SQL語句。  

    /// <param name="content">參數内容,比如一個字段是格式複雜的文章，有特殊符号，可以通過這個方式添加</param>  

    public static int ExecuteSql(string SQLString, string content)  

            SqlCommand cmd = new SqlCommand(SQLString, connection);  

            System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@content", SqlDbType.VarChar);  

            myParameter.Value = content;  

            cmd.Parameters.Add(myParameter);  

                connection.Open();  

                int rows = cmd.ExecuteNonQuery();  

                return rows;  

            finally 

                cmd.Dispose();  

                connection.Close();  

    /// 向資料庫裡插入圖像格式的字段(和上面情況類似的另一種執行個體)  

    /// <param name="strSQL">SQL語句</param>  

    /// <param name="fs">圖像位元組,資料庫的字段類型為p_w_picpath的情況</param>  

    public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)  

            SqlCommand cmd = new SqlCommand(strSQL, connection);  

            System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@fs", SqlDbType.Binary);  

            myParameter.Value = fs;  

    /// 執行一條計算查詢結果語句，傳回查詢結果（object）。  

    /// <param name="SQLString">計算查詢結果語句</param>  

    /// <returns>查詢結果（object）</returns>  

    public static object GetSingle(string SQLString)  

                    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 new Exception(e.Message);  

    /// 執行查詢語句，傳回SqlDataReader  

    /// <param name="strSQL">查詢語句</param>  

    /// <returns>SqlDataReader</returns>  

    public static SqlDataReader ExecuteReader(string strSQL)  

        SqlConnection connection = new SqlConnection(connectionString);  

        SqlCommand cmd = new SqlCommand(strSQL, connection);  

        try 

            connection.Open();  

            SqlDataReader myReader = cmd.ExecuteReader();  

            return myReader;  

        catch (System.Data.SqlClient.SqlException e)  

            throw new Exception(e.Message);  

    /// 執行查詢語句，傳回DataSet  

    /// <param name="SQLString">查詢語句</param>  

    /// <returns>DataSet</returns>  

    public static DataSet Query(string SQLString)  

            DataSet ds = new DataSet();  

                SqlDataAdapter command = new SqlDataAdapter(SQLString, connection);  

                command.Fill(ds, "ds");  

            catch (System.Data.SqlClient.SqlException ex)  

                throw new Exception(ex.Message);  

            return ds;  

    /// 執行查詢語句，傳回datatable  

    public static DataTable QueryTable(string SQLString)  

            return ds.Tables[0];  

    #region 執行帶參數的SQL語句  

    public static int ExecuteSql(string SQLString, params SqlParameter[] cmdParms)  

            using (SqlCommand cmd = new SqlCommand())  

                    PrepareCommand(cmd, connection, null, SQLString, cmdParms);  

                    cmd.Parameters.Clear();  

    }

    #region 執行事務

    public static Boolean ExecuteTransaction(string[] sql)

    {

        bool chenggong = false;

        using (SqlConnection conn = new SqlConnection(connectionString))

        {

            conn.Open();

            using (SqlTransaction trans = conn.BeginTransaction())

            {

                SqlCommand cmd = new SqlCommand();

                try

                {

                    cmd.Connection = conn;

                    cmd.Transaction = trans;

                    for (int i = 0; i < sql.Length; i++)

                    {

                        if (sql[i] != "")

                        {

                            cmd.CommandText = sql[i];

                            cmd.ExecuteNonQuery();

                        }

                    }

                    trans.Commit();

                    chenggong = true;

                }

                catch (Exception ex)

                    trans.Rollback();

                finally

                    conn.Close();

            }

        }

        return chenggong;

    #endregion

    /// <param name="SQLStringList">SQL語句的哈希表（key為sql語句，value是該語句的SqlParameter[]）</param>  

    public static void ExecuteSqlTran(Hashtable SQLStringList)  

            using (SqlTransaction trans = conn.BeginTransaction())  

                SqlCommand cmd = new SqlCommand();  

                    //循環  

                    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;  

    public static object GetSingle(string SQLString, params SqlParameter[] cmdParms)  

    public static SqlDataReader ExecuteReader(string SQLString, params SqlParameter[] cmdParms)  

        SqlCommand cmd = new SqlCommand();  

            PrepareCommand(cmd, connection, null, SQLString, cmdParms);  

            cmd.Parameters.Clear();  

    public static DataSet Query(string SQLString, params SqlParameter[] cmdParms)  

            using (SqlDataAdapter da = new SqlDataAdapter(cmd))  

                DataSet ds = new DataSet();  

                    da.Fill(ds, "ds");  

                catch (System.Data.SqlClient.SqlException ex)  

                    throw new Exception(ex.Message);  

                return ds;  

    public static DataTable QueryTable(string SQLString, params SqlParameter[] cmdParms)  

                return ds.Tables[0];  

    private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, string cmdText, SqlParameter[] cmdParms)  

        if (conn.State != ConnectionState.Open)  

        cmd.Connection = conn;  

        cmd.CommandText = cmdText;  

        if (trans != null)  

            cmd.Transaction = trans;  

        cmd.CommandType = CommandType.Text;//cmdType;  

        if (cmdParms != null)  

            foreach (SqlParameter parm in cmdParms)  

                cmd.Parameters.Add(parm);  

    #region 存儲過程操作  

    /// 執行存儲過程  

    /// <param name="storedProcName">存儲過程名</param>  

    /// <param name="parameters">存儲過程參數</param>  

    public static SqlDataReader RunProcedure(string storedProcName, IDataParameter[] parameters)  

        SqlDataReader returnReader;  

        connection.Open();  

        SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);  

        command.CommandType = CommandType.StoredProcedure;  

        returnReader = command.ExecuteReader();  

        return returnReader;  

    /// <param name="tableName">DataSet結果中的表名</param>  

    public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName)  

            DataSet dataSet = new DataSet();  

            SqlDataAdapter sqlDA = new SqlDataAdapter();  

            sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);  

            sqlDA.Fill(dataSet, tableName);  

            connection.Close();  

            return dataSet;  

    /// 建構 SqlCommand 對象(用來傳回一個結果集，而不是一個整數值)  

    /// <param name="connection">資料庫連接配接</param>  

    /// <returns>SqlCommand</returns>  

    private static SqlCommand BuildQueryCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)  

        SqlCommand command = new SqlCommand(storedProcName, connection);  

        foreach (SqlParameter parameter in parameters)  

            command.Parameters.Add(parameter);  

        return command;  

    /// 執行存儲過程，傳回影響的行數        

    /// <param name="rowsAffected">影響的行數</param>  

    /// <returns></returns>  

    public static int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected)  

            int result;  

            SqlCommand command = BuildIntCommand(connection, storedProcName, parameters);  

            rowsAffected = command.ExecuteNonQuery();  

            result = (int)command.Parameters["ReturnValue"].Value;  

            //Connection.Close();  

            return result;  

    /// 建立 SqlCommand 對象執行個體(用來傳回一個整數值)     

    /// <returns>SqlCommand 對象執行個體</returns>  

    private static SqlCommand BuildIntCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)  

        command.Parameters.Add(new SqlParameter("ReturnValue",  

            SqlDbType.Int, 4, ParameterDirection.ReturnValue,  

            false, 0, 0, string.Empty, DataRowVersion.Default, null));  

    #endregion  

}