C#工具類SqlServerHelper，基於System.Data.SqlClient封裝

源碼：

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.SqlClient;

namespace Fly.Util.DataBase
{
    /// <summary>
    /// SqlServer數據庫操作類
    /// </summary>
    public static class SqlServerHelper
    {
        /// <summary>  
        /// 執行數據庫非查詢操作,返回受影響的行數  
        /// </summary>  
        /// <param name="connectionString">數據庫連接字符串</param>
        /// <param name="cmdType">命令的類型</param>
        /// <param name="cmdText">SqlServer存儲過程名稱或PL/SQL命令</param>  
        /// <param name="cmdParms">命令參數集合</param>  
        /// <returns>當前操作影響的數據行數</returns>  
        public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
        {
            SqlCommand cmd = new SqlCommand();
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
                int val = cmd.ExecuteNonQuery();
                cmd.Parameters.Clear();
                return val;
            }
        }

        /// <summary>  
        /// 執行數據庫事務非查詢操作,返回受影響的行數  
        /// </summary>  
        /// <param name="transaction">數據庫事務對象</param>  
        /// <param name="cmdType">Command類型</param>  
        /// <param name="cmdText">SqlServer存儲過程名稱或PL/SQL命令</param>  
        /// <param name="cmdParms">命令參數集合</param>  
        /// <returns>當前事務操作影響的數據行數</returns>  
        public static int ExecuteNonQuery(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
        {
            SqlCommand cmd = new SqlCommand();
            PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, cmdParms);
            int val = cmd.ExecuteNonQuery();
            cmd.Parameters.Clear();
            return val;
        }

        /// <summary>  
        /// 執行數據庫非查詢操作,返回受影響的行數  
        /// </summary>  
        /// <param name="connection">SqlServer數據庫連接對象</param>  
        /// <param name="cmdType">Command類型</param>  
        /// <param name="cmdText">SqlServer存儲過程名稱或PL/SQL命令</param>  
        /// <param name="cmdParms">命令參數集合</param>  
        /// <returns>當前操作影響的數據行數</returns>  
        public static int ExecuteNonQuery(SqlConnection connection, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
        {
            if (connection == null)
                throw new ArgumentNullException("當前數據庫連接不存在");
            SqlCommand cmd = new SqlCommand();
            PrepareCommand(cmd, connection, null, cmdType, cmdText, cmdParms);
            int val = cmd.ExecuteNonQuery();
            cmd.Parameters.Clear();
            return val;
        }

        /// <summary>  
        /// 執行數據庫查詢操作,返回SqlDataReader類型的內存結果集  
        /// </summary>  
        /// <param name="connectionString">數據庫連接字符串</param>
        /// <param name="cmdType">命令的類型</param>
        /// <param name="cmdText">SqlServer存儲過程名稱或PL/SQL命令</param>  
        /// <param name="cmdParms">命令參數集合</param>  
        /// <returns>當前查詢操作返回的SqlDataReader類型的內存結果集</returns>  
        public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
        {
            SqlCommand cmd = new SqlCommand();
            SqlConnection conn = new SqlConnection(connectionString);
            try
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
                SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return reader;
            }
            catch
            {
                cmd.Dispose();
                conn.Close();
                throw;
            }
        }

        /// <summary>  
        /// 執行數據庫查詢操作,返回DataSet類型的結果集  
        /// </summary>  
        /// <param name="connectionString">數據庫連接字符串</param>
        /// <param name="cmdType">命令的類型</param>
        /// <param name="cmdText">SqlServer存儲過程名稱或PL/SQL命令</param>  
        /// <param name="cmdParms">命令參數集合</param>  
        /// <returns>當前查詢操作返回的DataSet類型的結果集</returns>  
        public static DataSet ExecuteDataSet(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
        {
            SqlCommand cmd = new SqlCommand();
            SqlConnection conn = new SqlConnection(connectionString);
            DataSet ds = null;
            try
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
                SqlDataAdapter adapter = new SqlDataAdapter();
                adapter.SelectCommand = cmd;
                ds = new DataSet();
                adapter.Fill(ds);
                cmd.Parameters.Clear();
            }
            catch
            {
                throw;
            }
            finally
            {
                cmd.Dispose();
                conn.Close();
                conn.Dispose();
            }

            return ds;
        }

        /// <summary>  
        /// 執行數據庫查詢操作,返回DataTable類型的結果集  
        /// </summary>  
        /// <param name="connectionString">數據庫連接字符串</param>
        /// <param name="cmdType">命令的類型</param>
        /// <param name="cmdText">SqlServer存儲過程名稱或PL/SQL命令</param>  
        /// <param name="cmdParms">命令參數集合</param>  
        /// <returns>當前查詢操作返回的DataTable類型的結果集</returns>  
        public static DataTable ExecuteDataTable(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
        {
            SqlCommand cmd = new SqlCommand();
            SqlConnection conn = new SqlConnection(connectionString);
            DataTable dt = null;

            try
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
                SqlDataAdapter adapter = new SqlDataAdapter();
                adapter.SelectCommand = cmd;
                dt = new DataTable();
                adapter.Fill(dt);
                cmd.Parameters.Clear();
            }
            catch
            {
                throw;
            }
            finally
            {
                cmd.Dispose();
                conn.Close();
                conn.Dispose();
            }

            return dt;
        }

        /// <summary>  
        /// 執行數據庫查詢操作,返回結果集中位於第一行第一列的Object類型的值  
        /// </summary>  
        /// <param name="connectionString">數據庫連接字符串</param>
        /// <param name="cmdType">命令的類型</param>
        /// <param name="cmdText">SqlServer存儲過程名稱或PL/SQL命令</param>  
        /// <param name="cmdParms">命令參數集合</param>  
        /// <returns>當前查詢操作返回的結果集中位於第一行第一列的Object類型的值</returns>  
        public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
        {
            SqlCommand cmd = new SqlCommand();
            SqlConnection conn = new SqlConnection(connectionString);
            object result = null;
            try
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
                result = cmd.ExecuteScalar();
                cmd.Parameters.Clear();
            }
            catch
            {
                throw;
            }
            finally
            {
                cmd.Dispose();
                conn.Close();
                conn.Dispose();
            }

            return result;
        }

        /// <summary>  
        /// 執行數據庫事務查詢操作,返回結果集中位於第一行第一列的Object類型的值  
        /// </summary>  
        /// <param name="trans">一個已存在的數據庫事務對象</param>  
        /// <param name="commandType">命令類型</param>  
        /// <param name="commandText">SqlServer存儲過程名稱或PL/SQL命令</param>  
        /// <param name="cmdParms">命令參數集合</param>  
        /// <returns>當前事務查詢操作返回的結果集中位於第一行第一列的Object類型的值</returns>  
        public static object ExecuteScalar(SqlTransaction trans, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
        {
            if (trans == null)
                throw new ArgumentNullException("當前數據庫事務不存在");
            SqlConnection conn = trans.Connection;
            if (conn == null)
                throw new ArgumentException("當前事務所在的數據庫連接不存在");

            SqlCommand cmd = new SqlCommand();
            object result = null;

            try
            {
                PrepareCommand(cmd, conn, trans, cmdType, cmdText, cmdParms);
                result = cmd.ExecuteScalar();
                cmd.Parameters.Clear();
            }
            catch
            {
                throw;
            }
            finally
            {
                trans.Dispose();
                cmd.Dispose();
                conn.Close();
                conn.Dispose();
            }

            return result;
        }

        /// <summary>  
        /// 執行數據庫查詢操作,返回結果集中位於第一行第一列的Object類型的值  
        /// </summary>  
        /// <param name="conn">數據庫連接對象</param>  
        /// <param name="cmdType">Command類型</param>  
        /// <param name="cmdText">SqlServer存儲過程名稱或PL/SQL命令</param>  
        /// <param name="cmdParms">命令參數集合</param>  
        /// <returns>當前查詢操作返回的結果集中位於第一行第一列的Object類型的值</returns>  
        public static object ExecuteScalar(SqlConnection conn, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)
        {
            if (conn == null) throw new ArgumentException("當前數據庫連接不存在");
            SqlCommand cmd = new SqlCommand();
            object result = null;

            try
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);
                result = cmd.ExecuteScalar();
                cmd.Parameters.Clear();
            }
            catch
            {
                throw;
            }
            finally
            {
                cmd.Dispose();
                conn.Close();
                conn.Dispose();
            }

            return result;
        }

        /// <summary>
        /// 執行存儲過程
        /// </summary>
        /// <param name="connection">SqlServer數據庫連接對象</param>  
        /// <param name="storedProcName">存儲過程名</param>
        /// <param name="parameters">存儲過程參數</param>
        /// <returns>SqlDataReader對象</returns>
        public static SqlDataReader RunStoredProcedure(SqlConnection connection, string storedProcName, IDataParameter[] parameters)
        {
            SqlDataReader returnReader = null;
            connection.Open();
            SqlCommand command = BuildSqlCommand(connection, storedProcName, parameters);
            returnReader = command.ExecuteReader(CommandBehavior.CloseConnection);
            return returnReader;
        }


        /// <summary>  
        /// 執行數據庫命令前的准備工作  
        /// </summary>  
        /// <param name="cmd">Command對象</param>  
        /// <param name="conn">數據庫連接對象</param>  
        /// <param name="trans">事務對象</param>  
        /// <param name="cmdType">Command類型</param>  
        /// <param name="cmdText">SqlServer存儲過程名稱或PL/SQL命令</param>  
        /// <param name="cmdParms">命令參數集合</param>  
        private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, CommandType cmdType, 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 = cmdType;

            if (cmdParms != null)
            {
                foreach (SqlParameter parm in cmdParms)
                    cmd.Parameters.Add(parm);
            }
        }

        /// <summary>
        /// 構建SqlCommand對象
        /// </summary>
        /// <param name="connection">數據庫連接</param>
        /// <param name="storedProcName">存儲過程名</param>
        /// <param name="parameters">存儲過程參數</param>
        /// <returns>SqlCommand</returns>
        private static SqlCommand BuildSqlCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)
        {
            SqlCommand command = new SqlCommand(storedProcName, connection);
            command.CommandType = CommandType.StoredProcedure;
            foreach (SqlParameter parameter in parameters)
            {
                command.Parameters.Add(parameter);
            }
            return command;
        }
    }
}