中文SqlHelper.cs类

using System;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Collections;
namespace com.DataAccess
{
    /// <summary>
    /// SqlHelper类提供很高的数据访问性能,
    /// 使用SqlClient类的通用定义.
    /// </summary>
    public abstract class SqlHelper
    {
        //定义数据库连接串
        public static readonly string ConnectionStringLocalTransaction = ConfigurationManager.ConnectionStrings["TestConnectionString"].ConnectionString;
        //public static readonly string ConnectionStringInventoryDistributedTransaction = ConfigurationManager.ConnectionStrings["SQLConnString2"].ConnectionString;
        //public static readonly string ConnectionStringOrderDistributedTransaction = ConfigurationManager.ConnectionStrings["SQLConnString3"].ConnectionString;
        //public static readonly string ConnectionStringProfile = ConfigurationManager.ConnectionStrings["SQLProfileConnString"].ConnectionString;
        // 存贮Cache缓存的Hashtable集合
        private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());
        /// <summary>
        /// 使用连接字符串，执行一个SqlCommand命令（没有记录返回）
        /// 使用提供的参数集.
        /// </summary>
        /// <remarks>
        /// 示例:  
        ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString">一个有效的SqlConnection连接串</param>
        /// <param name="commandType">命令类型CommandType(stored procedure, text, etc.)</param>
        /// <param name="commandText">存贮过程名称或是一个T-SQL语句串</param>
        /// <param name="commandParameters">执行命令的参数集</param>
        /// <returns>受此命令影响的行数</returns>
        public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                int val = cmd.ExecuteNonQuery();
                cmd.Parameters.Clear();
                return val;
            }
        }
        /// <summary>
        /// 在一个存在的连接上执行数据库的命令操作
        /// 使用提供的参数集.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int result = ExecuteNonQuery(connection, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="conn">一个存在的数据库连接对象</param>
        /// <param name="commandType">命令类型CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">存贮过程名称或是一个T-SQL语句串</param>
        /// <param name="commandParameters">执行命令的参数集</param>
        /// <returns>受此命令影响的行数</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>
        /// 在一个事务的连接上执行数据库的命令操作
        /// 使用提供的参数集.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="trans">一个存在的事务</param>
        /// <param name="commandType">命令类型CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">存贮过程名称或是一个T-SQL语句串</param>
        /// <param name="commandParameters">执行命令的参数集</param>
        /// <returns>受此命令影响的行数</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>
        /// 在一个连接串上执行一个命令，返回一个SqlDataReader对象
        /// 使用提供的参数.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  SqlDataReader r = ExecuteReader(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString">一个有效的SqlConnection连接串</param>
        /// <param name="commandType">命令类型CommandType(stored procedure, text, etc.)</param>
        /// <param name="commandText">存贮过程名称或是一个T-SQL语句串</param>
        /// <param name="commandParameters">执行命令的参数集</param>
        /// <returns>一个结果集对象SqlDataReader</returns>
        public static SqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            SqlCommand cmd = new SqlCommand();
            SqlConnection conn = new SqlConnection(connectionString);
            // 如果不存在要查询的对象，则发生异常
            // 连接要关闭
            // CommandBehavior.CloseConnection在异常时不发生作用
            try
            {
                PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters);
                SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return rdr;
            }
            catch
            {
                conn.Close();
                throw;
            }
        }
        /// <summary>
        /// 在一个连接串上执行一个命令，返回表中第一行，第一列的值
        /// 使用提供的参数.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString">一个有效的SqlConnection连接串</param>
        /// <param name="commandType">命令类型CommandType(stored procedure, text, etc.)</param>
        /// <param name="commandText">存贮过程名称或是一个T-SQL语句串</param>
        /// <param name="commandParameters">执行命令的参数集</param>        
        /// <returns>返回的对象，在使用时记得类型转换</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>
        /// 在一个连接上执行一个命令，返回表中第一行，第一列的值
        /// 使用提供的参数.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString">一个有效的SqlConnection连接</param>
        /// <param name="commandType">命令类型CommandType(stored procedure, text, etc.)</param>
        /// <param name="commandText">存贮过程名称或是一个T-SQL语句串</param>
        /// <param name="commandParameters">执行命令的参数集</param>        
        /// <returns>返回的对象，在使用时记得类型转换</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>
        /// 在缓存中添加参数数组
        /// </summary>
        /// <param name="cacheKey">参数的Key</param>
        /// <param name="cmdParms">参数数组</param>
        public static void CacheParameters(string cacheKey, params SqlParameter[] commandParameters)
        {
            parmCache[cacheKey] = commandParameters;
        }
        /// <summary>
        /// 提取缓存的参数数组
        /// </summary>
        /// <param name="cacheKey">查找缓存的key</param>
        /// <returns>返回被缓存的参数数组</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 = (SqlParameter)((ICloneable)cachedParms).Clone();
            return clonedParms;
        }
        /// <summary>
        /// 提供一个SqlCommand对象的设置
        /// </summary>
        /// <param name="cmd">SqlCommand对象</param>
        /// <param name="conn">SqlConnection 对象</param>
        /// <param name="trans">SqlTransaction 对象</param>
        /// <param name="cmdType">CommandType 如存贮过程，T-SQL</param>
        /// <param name="cmdText">存贮过程名或查询串</param>
        /// <param name="cmdParms">命令中用到的参数集</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);
            }
        }
    }
}

来源：https://www.cnblogs.com/freedom831215/archive/2009/10/03/1577620.html