数据操作类 SQLHelper.cs

/// <summary>
/// 通用数据库接口
/// </summary> 
using System;
using System.Collections;
using System.Collections.Specialized;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Data.Common;
using System.Collections.Generic;
namespace DBUtility
{
    public enum EffentNextType
    {
        /// <summary> 
        /// 对其他语句无任何影响 
        /// </summary> None, 
        /// <summary> 
        /// 当前语句必须为"SELECT COUNT(1) FROM .."格式,如果存在则继续执行,不存在回滚事务 
        /// </summary> WhenHaveContine, 
        /// <summary> 
        /// 当前语句必须为"SELECT COUNT(1) FROM .."格式,如果不存在则继续执行,存在回滚事务 
        /// </summary> WhenNoHaveContine, 
        /// <summary> 
        /// 当前语句影响到的行数必须大于0,否则回滚事务 
        /// </summary> ExcuteEffectRows, 
        /// <summary> 
        /// 引发事件-当前语句必须为"SELECT COUNT(1) FROM .."格式,如果不存在则继续执行,存在回滚事务 
        /// </summary> SolicitationEvent 
    }
    public class CommandInfo
    {
        public object ShareObject = null;
        public object OriginalData = null;
        event EventHandler _solicitationEvent;
        public event EventHandler SolicitationEvent
        {
            add
            {
                _solicitationEvent += value;
            }
            remove
            {
                _solicitationEvent -= value;
            }
        }
        public void OnSolicitationEvent()
        {
            if (_solicitationEvent != null)
            {
                _solicitationEvent(this, new EventArgs());
            }
        }
        public string CommandText;
        public System.Data.Common.DbParameter[] Parameters;
        public EffentNextType EffentNextType = EffentNextType.None;
        public CommandInfo()
        {
        }
        public CommandInfo(string sqlText, SqlParameter[] para)
        {
            this.CommandText = sqlText;
            this.Parameters = para;
        }
        public CommandInfo(string sqlText, SqlParameter[] para, EffentNextType type)
        {
            this.CommandText = sqlText;
            this.Parameters = para;
            this.EffentNextType = type;
        }
    }
    /// <summary> 
    /// 数据访问抽象基础类 
    /// </summary>
    public abstract class SQLHelper
    {
        //数据库连接字符串(web.config来配置),可以动态更改connectionString支持多数据库. 
        public static string connectionString = "";
        public SQLHelper()
        {
            connectionString = @"DATA SOURCE=(local);UID=sa;PWD=sa;DATABASE=db";
        }
        #region 公用方法 
        /// <summary> 
        /// 读取指定图片的二进制信息 
        /// </summary> 
        /// <param name="id"></param> 
        /// <returns></returns> 
        public object LoadImage(int id)
        {
            SqlConnection myConnection = new SqlConnection(connectionString);
            SqlCommand myCommand = new SqlCommand("SELECT [bImage] FROM [tblCAIPIAO_NEWS_IMG] WHERE id=@id", myConnection);
            myCommand.CommandType = CommandType.Text;
            myCommand.Parameters.Add(new SqlParameter("@id", id));
            myConnection.Open();
            object result = myCommand.ExecuteScalar();
            try
            {
                return new System.IO.MemoryStream((byte[])result);
            }
            catch (ArgumentNullException e)
            {
                return null;
            }
            finally
            {
                myConnection.Close();
            }
        }
        /// <summary> 
        /// 判断是否存在某表的某个字段 
        /// </summary> 
        /// <param name="tableName">表名称</param> 
        /// <param name="columnName">列名称</param> 
        /// <returns>是否存在</returns> 
        public static bool ColumnExists(string tableName, string columnName)
        {
            string sql = "select count(1) from syscolumns where [id]=object_id('" + tableName + "') and [name]='" + columnName + "'";
            object res = GetSingle(sql);
            if (res == null)
            {
                return false;
            }
            return Convert.ToInt32(res) > 0;
        }
        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;
            }
            else
            {
                cmdresult = int.Parse(obj.ToString());
            }
            if (cmdresult == 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }
        /// <summary> 
        /// 表是否存在 
        /// </summary> 
        /// <param name="TableName"></param> 
        /// <returns></returns> 
        public static bool TabExists(string TableName)
        {
            string strsql = "select count(*) from sysobjects where id = object_id(N"[" + TableName + "]") and OBJECTPROPERTY(id, N"IsUserTable") = 1";
            //string strsql = "SELECT count(*) FROM sys.objects WHERE object_id = OBJECT_ID(N"[dbo].[" + TableName + "]") AND type in (N"U")";
            object obj = SQLHelper.GetSingle(strsql);
            int cmdresult;
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = int.Parse(obj.ToString());
            }
            if (cmdresult == 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }
        public static bool Exists(string strSql, params SqlParameter[] cmdParms)
        {
            object obj = SQLHelper.GetSingle(strSql, cmdParms);
            int cmdresult;
            if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
            {
                cmdresult = 0;
            }
            else
            {
                cmdresult = int.Parse(obj.ToString());
            }
            if (cmdresult == 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }
        #endregion
        #region 执行简单SQL语句 
        /// <summary> 
        /// 执行SQL语句,返回影响的记录数 
        /// </summary> 
        /// <param name="SQLString">SQL语句</param> 
        /// <returns>影响的记录数</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 e;
                    }
                }
            }
        }
        public static int ExecuteSqlByTime(string SQLString, int Times)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                using (SqlCommand cmd = new SqlCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        cmd.CommandTimeout = Times;
                        int rows = cmd.ExecuteNonQuery();
                        return rows;
                    }
                    catch (System.Data.SqlClient.SqlException e)
                    {
                        connection.Close();
                        throw e;
                    }
                }
            }
        }
        /// <summary> 
        /// 执行Sql和Oracle滴混合事务 
        /// </summary> 
        /// <param name="list">SQL命令行列表</param> 
        /// <param name="oracleCmdSqlList">Oracle命令行列表</param> 
        /// <returns>执行结果 0-由于SQL造成事务失败 -1 由于Oracle造成事务失败 1-整体事务执行成功</returns> 
        public static int ExecuteSqlTran(List<CommandInfo> list, List<CommandInfo> oracleCmdSqlList)
        {
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                conn.Open();
                SqlCommand cmd = new SqlCommand();
                cmd.Connection = conn;
                SqlTransaction tx = conn.BeginTransaction();
                cmd.Transaction = tx;
                try
                {
                    foreach (CommandInfo myDE in list)
                    {
                        string cmdText = myDE.CommandText;
                        SqlParameter[] cmdParms = (SqlParameter[])myDE.Parameters;
                        PrepareCommand(cmd, conn, tx, cmdText, cmdParms);
                        if (myDE.EffentNextType == EffentNextType.SolicitationEvent)
                        {
                            if (myDE.CommandText.ToLower().IndexOf("count(") == -1)
                            {
                                tx.Rollback();
                                throw new Exception("违背要求" + myDE.CommandText + "必须符合select count(..的格式");
                                //return 0;
                            }
                            object obj = cmd.ExecuteScalar();
                            bool isHave = false;
                            if (obj == null && obj == DBNull.Value)
                            {
                                isHave = false;
                            }
                            isHave = Convert.ToInt32(obj) > 0;
                            if (isHave)
                            {
                                //引发事件 myDE.OnSolicitationEvent();
                            }
                        }
                        if (myDE.EffentNextType == EffentNextType.WhenHaveContine || myDE.EffentNextType == EffentNextType.WhenNoHaveContine)
                        {
                            if (myDE.CommandText.ToLower().IndexOf("count(") == -1)
                            {
                                tx.Rollback();
                                throw new Exception("SQL:违背要求" + myDE.CommandText + "必须符合select count(..的格式");
                                //return 0;
                            }
                            object obj = cmd.ExecuteScalar();
                            bool isHave = false;
                            if (obj == null && obj == DBNull.Value)
                            {
                                isHave = false;
                            }
                            isHave = Convert.ToInt32(obj) > 0;
                            if (myDE.EffentNextType == EffentNextType.WhenHaveContine && !isHave)
                            {
                                tx.Rollback();
                                throw new Exception("SQL:违背要求" + myDE.CommandText + "返回值必须大于0");
                                //return 0;
                            }
                            if (myDE.EffentNextType == EffentNextType.WhenNoHaveContine && isHave)
                            {
                                tx.Rollback();
                                throw new Exception("SQL:违背要求" + myDE.CommandText + "返回值必须等于0");
                                //return 0;
                            }
                            continue;
                        }
                        int val = cmd.ExecuteNonQuery();
                        if (myDE.EffentNextType == EffentNextType.ExcuteEffectRows && val == 0)
                        {
                            tx.Rollback();
                            throw new Exception("SQL:违背要求" + myDE.CommandText + "必须有影响行");
                            //return 0;
                        }
                        cmd.Parameters.Clear();
                    }
                    //string oraConnectionString = PubConstant.GetConnectionString("ConnectionStringPPC");
                    //bool res = OracleHelper.ExecuteSqlTran(oraConnectionString, oracleCmdSqlList);
                    //if (!res) 
                    //{
                    // tx.Rollback();
                    // throw new Exception("Oracle执行失败");
                    // return -1;
                    //}
                    tx.Commit();
                    return 1;
                }
                catch (System.Data.SqlClient.SqlException e)
                {
                    tx.Rollback();
                    throw e;
                }
                catch (Exception e)
                {
                    tx.Rollback();
                    throw e;
                }
            }
        }
        /// <summary> 
        /// 执行多条SQL语句,实现数据库事务。 
        /// </summary> 
        /// <param name="SQLStringList">多条SQL语句</param> 
        public static int ExecuteSqlTran(List<String> SQLStringList)
        {
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                conn.Open();
                SqlCommand cmd = new SqlCommand();
                cmd.Connection = conn;
                SqlTransaction tx = conn.BeginTransaction();
                cmd.Transaction = tx;
                try
                {
                    int count = 0;
                    for (int n = 0;
                    n < SQLStringList.Count;
                    n++)
                    {
                        string strsql = SQLStringList[n];
                        if (strsql.Trim().Length > 1)
                        {
                            cmd.CommandText = strsql;
                            count += cmd.ExecuteNonQuery();
                        }
                    }
                    tx.Commit();
                    return count;
                }
                catch
                {
                    tx.Rollback();
                    return 0;
                }
            }
        }
        /// <summary> 
        /// 执行带一个存储过程参数的的SQL语句。 
        /// </summary> 
        /// <param name="SQLString">SQL语句</param> 
        /// <param name="content">参数内容,比如一个字段是格式复杂的文章,有特殊符号,可以通过这个方式添加</param> 
        /// <returns>影响的记录数</returns> 
        public static int ExecuteSql(string SQLString, string content)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand cmd = new SqlCommand(SQLString, connection);
                System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@content", SqlDbType.NText);
                myParameter.Value = content;
                cmd.Parameters.Add(myParameter);
                try
                {
                    connection.Open();
                    int rows = cmd.ExecuteNonQuery();
                    return rows;
                }
                catch (System.Data.SqlClient.SqlException e)
                {
                    throw e;
                }
                finally
                {
                    cmd.Dispose();
                    connection.Close();
                }
            }
        }
        /// <summary> 
        /// 执行带一个存储过程参数的的SQL语句。 
        /// </summary> 
        /// <param name="SQLString">SQL语句</param> 
        /// <param name="content">参数内容,比如一个字段是格式复杂的文章,有特殊符号,可以通过这个方式添加</param> 
        /// <returns>影响的记录数</returns> 
        public static object ExecuteSqlGet(string SQLString, string content)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand cmd = new SqlCommand(SQLString, connection);
                System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@content", SqlDbType.NText);
                myParameter.Value = content;
                cmd.Parameters.Add(myParameter);
                try
                {
                    connection.Open();
                    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 e;
                }
                finally
                {
                    cmd.Dispose();
                    connection.Close();
                }
            }
        }
        /// <summary> 
        /// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例) 
        /// </summary> 
        /// <param name="strSQL">SQL语句</param> 
        /// <param name="fs">图像字节,数据库的字段类型为image的情况</param> 
        /// <returns>影响的记录数</returns> 
        public static int ExecuteSqlInsertImg(string strSQL, byte[] fs)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand cmd = new SqlCommand(strSQL, connection);
                System.Data.SqlClient.SqlParameter myParameter = new System.Data.SqlClient.SqlParameter("@fs", SqlDbType.Image);
                myParameter.Value = fs;
                cmd.Parameters.Add(myParameter);
                try
                {
                    connection.Open();
                    int rows = cmd.ExecuteNonQuery();
                    return rows;
                }
                catch (System.Data.SqlClient.SqlException e)
                {
                    throw e;
                }
                finally
                {
                    cmd.Dispose();
                    connection.Close();
                }
            }
        }
        /// <summary> 
        /// 执行一条计算查询结果语句,返回查询结果(object)。 
        /// </summary> 
        /// <param name="SQLString">计算查询结果语句</param> 
        /// <returns>查询结果(object)</returns> 
        public static object GetSingle(string SQLString)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                using (SqlCommand cmd = new SqlCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        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)
                    {
                        connection.Close();
                        throw e;
                    }
                }
            }
        }
        public static object GetSingle(string SQLString, int Times)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                using (SqlCommand cmd = new SqlCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        cmd.CommandTimeout = Times;
                        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)
                    {
                        connection.Close();
                        throw e;
                    }
                }
            }
        }
        /// <summary> 
        /// 执行查询语句,返回SqlDataReader ( 注意:调用该方法后,一定要对SqlDataReader进行Close ) 
        /// </summary> 
        /// <param name="strSQL">查询语句</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(CommandBehavior.CloseConnection);
                return myReader;
            }
            catch (System.Data.SqlClient.SqlException e)
            {
                throw e;
            }
        }
        /// <summary> 
        /// 执行查询语句,返回DataSet 
        /// </summary> 
        /// <param name="SQLString">查询语句</param> 
        /// <returns>DataSet</returns> 
        public static DataSet Query(string SQLString)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                DataSet ds = new DataSet();
                try
                {
                    connection.Open();
                    SqlDataAdapter command = new SqlDataAdapter(SQLString, connection);
                    command.Fill(ds, "ds");
                }
                catch (System.Data.SqlClient.SqlException ex)
                {
                    throw new Exception(ex.Message);
                }
                return ds;
            }
        }
        /// <summary> 
        /// 查询并得到数据集DataSet 
        /// </summary> 
        /// <param name="SQLString"></param> 
        /// <param name="Times"></param> 
        /// <returns></returns> 
        public static DataSet Query(string SQLString, int Times)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                DataSet ds = new DataSet();
                try
                {
                    connection.Open();
                    SqlDataAdapter command = new SqlDataAdapter(SQLString, connection);
                    command.SelectCommand.CommandTimeout = Times;
                    command.Fill(ds, "ds");
                }
                catch (System.Data.SqlClient.SqlException ex)
                {
                    throw new Exception(ex.Message);
                }
                return ds;
            }
        }
        #endregion
        #region 执行带参数的SQL语句 
        /// <summary> 
        /// 执行SQL语句,返回影响的记录数 
        /// </summary> 
        /// <param name="SQLString">SQL语句</param> 
        /// <returns>影响的记录数</returns> 
        public static int ExecuteSql(string SQLString, params SqlParameter[] cmdParms)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                using (SqlCommand cmd = new SqlCommand())
                {
                    try
                    {
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                        int rows = cmd.ExecuteNonQuery();
                        cmd.Parameters.Clear();
                        return rows;
                    }
                    catch (System.Data.SqlClient.SqlException e)
                    {
                        throw e;
                    }
                }
            }
        }
        /// <summary> 
        /// 执行多条SQL语句,实现数据库事务。 
        /// </summary> 
        /// <param name="SQLStringList">SQL语句的哈希表(key为sql语句,value是该语句的SqlParameter[])</param> 
        public static void ExecuteSqlTran(Hashtable SQLStringList)
        {
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                conn.Open();
                using (SqlTransaction trans = conn.BeginTransaction())
                {
                    SqlCommand cmd = new SqlCommand();
                    try
                    { //循环 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;
                    }
                }
            }
        }
        /// <summary> 
        /// 执行多条SQL语句,实现数据库事务。 
        /// </summary> 
        /// <param name="SQLStringList">SQL语句的哈希表(key为sql语句,value是该语句的SqlParameter[])</param> 
        public static int ExecuteSqlTran(System.Collections.Generic.List<CommandInfo> cmdList)
        {
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                conn.Open();
                using (SqlTransaction trans = conn.BeginTransaction())
                {
                    SqlCommand cmd = new SqlCommand();
                    try
                    {
                        int count = 0;
                        //循环 foreach (CommandInfo myDE in cmdList) 
                        {
                            string cmdText = myDE.CommandText;
                            SqlParameter[] cmdParms = (SqlParameter[])myDE.Parameters;
                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
                            if (myDE.EffentNextType == EffentNextType.WhenHaveContine || myDE.EffentNextType == EffentNextType.WhenNoHaveContine)
                            {
                                if (myDE.CommandText.ToLower().IndexOf("count(") == -1)
                                {
                                    trans.Rollback();
                                    return 0;
                                }
                                object obj = cmd.ExecuteScalar();
                                bool isHave = false;
                                if (obj == null && obj == DBNull.Value)
                                {
                                    isHave = false;
                                }
                                isHave = Convert.ToInt32(obj) > 0;
                                if (myDE.EffentNextType == EffentNextType.WhenHaveContine && !isHave)
                                {
                                    trans.Rollback();
                                    return 0;
                                }
                                if (myDE.EffentNextType == EffentNextType.WhenNoHaveContine && isHave)
                                {
                                    trans.Rollback();
                                    return 0;
                                }
                                continue;
                            }
                            int val = cmd.ExecuteNonQuery();
                            count += val;
                            if (myDE.EffentNextType == EffentNextType.ExcuteEffectRows && val == 0)
                            {
                                trans.Rollback();
                                return 0;
                            }
                            cmd.Parameters.Clear();
                        }
                        trans.Commit();
                        return count;
                    }
                    catch
                    {
                        trans.Rollback();
                        throw;
                    }
                }
            }
        }
        /// <summary> 
        /// 执行多条SQL语句,实现数据库事务。 
        /// </summary> 
        /// <param name="SQLStringList">SQL语句的哈希表(key为sql语句,value是该语句的SqlParameter[])</param> 
        public static void ExecuteSqlTranWithIndentity(System.Collections.Generic.List<CommandInfo> SQLStringList)
        {
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                conn.Open();
                using (SqlTransaction trans = conn.BeginTransaction())
                {
                    SqlCommand cmd = new SqlCommand();
                    try
                    {
                        int indentity = 0;
                        //循环 foreach (CommandInfo myDE in SQLStringList) 
                        {
                            string cmdText = myDE.CommandText;
                            SqlParameter[] cmdParms = (SqlParameter[])myDE.Parameters;
                            foreach (SqlParameter q in cmdParms)
                            {
                                if (q.Direction == ParameterDirection.InputOutput)
                                {
                                    q.Value = indentity;
                                }
                            }
                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
                            int val = cmd.ExecuteNonQuery();
                            foreach (SqlParameter q in cmdParms)
                            {
                                if (q.Direction == ParameterDirection.Output)
                                {
                                    indentity = Convert.ToInt32(q.Value);
                                }
                            }
                            cmd.Parameters.Clear();
                        }
                        trans.Commit();
                    }
                    catch
                    {
                        trans.Rollback();
                        throw;
                    }
                }
            }
        }
        /// <summary> 
        /// 执行多条SQL语句,实现数据库事务。 
        /// </summary> 
        /// <param name="SQLStringList">SQL语句的哈希表(key为sql语句,value是该语句的SqlParameter[])</param> 
        public static void ExecuteSqlTranWithIndentity(Hashtable SQLStringList)
        {
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                conn.Open();
                using (SqlTransaction trans = conn.BeginTransaction())
                {
                    SqlCommand cmd = new SqlCommand();
                    try
                    {
                        int indentity = 0;
                        //循环 foreach (DictionaryEntry myDE in SQLStringList) 
                        {
                            string cmdText = myDE.Key.ToString();
                            SqlParameter[] cmdParms = (SqlParameter[])myDE.Value;
                            foreach (SqlParameter q in cmdParms)
                            {
                                if (q.Direction == ParameterDirection.InputOutput)
                                {
                                    q.Value = indentity;
                                }
                            }
                            PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
                            int val = cmd.ExecuteNonQuery();
                            foreach (SqlParameter q in cmdParms)
                            {
                                if (q.Direction == ParameterDirection.Output)
                                {
                                    indentity = Convert.ToInt32(q.Value);
                                }
                            }
                            cmd.Parameters.Clear();
                        }
                        trans.Commit();
                    }
                    catch
                    {
                        trans.Rollback();
                        throw;
                    }
                }
            }
        }
        /// <summary> 
        /// 执行一条计算查询结果语句,返回查询结果(object)。 
        /// </summary> 
        /// <param name="SQLString">计算查询结果语句</param> 
        /// <returns>查询结果(object)</returns> 
        public static object GetSingle(string SQLString, params SqlParameter[] cmdParms)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                using (SqlCommand cmd = new SqlCommand())
                {
                    try
                    {
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                        object obj = cmd.ExecuteScalar();
                        cmd.Parameters.Clear();
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                        {
                            return null;
                        }
                        else
                        {
                            return obj;
                        }
                    }
                    catch (System.Data.SqlClient.SqlException e)
                    {
                        throw e;
                    }
                }
            }
        }
        /// <summary> 
        /// 执行查询语句,返回SqlDataReader ( 注意:调用该方法后,一定要对SqlDataReader进行Close ) 
        /// </summary> 
        /// <param name="strSQL">查询语句</param> 
        /// <returns>SqlDataReader</returns> 
        public static SqlDataReader ExecuteReader(string SQLString, params SqlParameter[] cmdParms)
        {
            SqlConnection connection = new SqlConnection(connectionString);
            SqlCommand cmd = new SqlCommand();
            try
            {
                PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                SqlDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return myReader;
            }
            catch (System.Data.SqlClient.SqlException e)
            {
                throw e;
            } //finally //
            { //cmd.Dispose();
              //connection.Close();
              //
            }
        }
        /// <summary> 
        /// 执行查询语句,返回DataSet 
        /// </summary> 
        /// <param name="SQLString">查询语句</param> 
        /// <returns>DataSet</returns> 
        public static DataSet Query(string SQLString, params SqlParameter[] cmdParms)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand cmd = new SqlCommand();
                PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                using (SqlDataAdapter da = new SqlDataAdapter(cmd))
                {
                    DataSet ds = new DataSet();
                    try
                    {
                        da.Fill(ds, "ds");
                        cmd.Parameters.Clear();
                    }
                    catch (System.Data.SqlClient.SqlException ex)
                    {
                        throw new Exception(ex.Message);
                    }
                    return ds;
                }
            }
        }
        private static void PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, 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 = CommandType.Text;
            //cmdType;
            if (cmdParms != null)
            {
                foreach (SqlParameter parameter in cmdParms)
                {
                    if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) && (parameter.Value == null))
                    {
                        parameter.Value = DBNull.Value;
                    }
                    cmd.Parameters.Add(parameter);
                }
            }
        }
        #endregion
        #region 存储过程操作 
        /// <summary> 
        /// 执行存储过程,返回SqlDataReader ( 注意:调用该方法后,一定要对SqlDataReader进行Close ) 
        /// </summary> 
        /// <param name="storedProcName">存储过程名</param> 
        /// <param name="parameters">存储过程参数</param> 
        /// <returns>SqlDataReader</returns> 
        public static SqlDataReader RunProcedure(string storedProcName, IDataParameter[] parameters)
        {
            SqlConnection connection = new SqlConnection(connectionString);
            SqlDataReader returnReader;
            connection.Open();
            SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
            command.CommandType = CommandType.StoredProcedure;
            returnReader = command.ExecuteReader(CommandBehavior.CloseConnection);
            return returnReader;
        }
        /// <summary> 
        /// 执行存储过程 
        /// </summary> 
        /// <param name="storedProcName">存储过程名</param> 
        /// <param name="parameters">存储过程参数</param> 
        /// <param name="tableName">DataSet结果中的表名</param> 
        /// <returns>DataSet</returns> 
        public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                DataSet dataSet = new DataSet();
                connection.Open();
                SqlDataAdapter sqlDA = new SqlDataAdapter();
                sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
                sqlDA.Fill(dataSet, tableName);
                connection.Close();
                return dataSet;
            }
        }
        public static DataSet RunProcedure(string storedProcName, IDataParameter[] parameters, string tableName, int Times)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                DataSet dataSet = new DataSet();
                connection.Open();
                SqlDataAdapter sqlDA = new SqlDataAdapter();
                sqlDA.SelectCommand = BuildQueryCommand(connection, storedProcName, parameters);
                sqlDA.SelectCommand.CommandTimeout = Times;
                sqlDA.Fill(dataSet, tableName);
                connection.Close();
                return dataSet;
            }
        }
        /// <summary> 
        /// 构建 SqlCommand 对象(用来返回一个结果集,而不是一个整数值) 
        /// </summary> 
        /// <param name="connection">数据库连接</param> 
        /// <param name="storedProcName">存储过程名</param> 
        /// <param name="parameters">存储过程参数</param> 
        /// <returns>SqlCommand</returns> 
        private static SqlCommand BuildQueryCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)
        {
            SqlCommand command = new SqlCommand(storedProcName, connection);
            command.CommandType = CommandType.StoredProcedure;
            foreach (SqlParameter parameter in parameters)
            {
                if (parameter != null)
                {
                    // 检查未分配值的输出参数,将其分配以DBNull.Value. 
                    if ((parameter.Direction == ParameterDirection.InputOutput || parameter.Direction == ParameterDirection.Input) && (parameter.Value == null))
                    {
                        parameter.Value = DBNull.Value;
                    }
                    command.Parameters.Add(parameter);
                }
            }
            return command;
        }
        /// <summary> 
        /// 执行存储过程,返回影响的行数 
        /// </summary> 
        /// <param name="storedProcName">存储过程名</param> 
        /// <param name="parameters">存储过程参数</param> 
        /// <param name="rowsAffected">影响的行数</param> 
        /// <returns></returns> 
        public static int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                int result;
                connection.Open();
                SqlCommand command = BuildIntCommand(connection, storedProcName, parameters);
                rowsAffected = command.ExecuteNonQuery();
                result = (int)command.Parameters["ReturnValue"].Value;
                //Connection.Close();
                return result;
            }
        }
        /// <summary> 
        /// 创建 SqlCommand 对象实例(用来返回一个整数值) 
        /// </summary> 
        /// <param name="storedProcName">存储过程名</param> 
        /// <param name="parameters">存储过程参数</param> 
        /// <returns>SqlCommand 对象实例</returns> 
        private static SqlCommand BuildIntCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)
        {
            SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
            command.Parameters.Add(new SqlParameter("ReturnValue", SqlDbType.Int, 4, ParameterDirection.ReturnValue, false, 0, 0, string.Empty, DataRowVersion.Default, null));
            return command;
        }
        #endregion
    }
}

 

posted @ 2009-12-31 15:03 曾祥展 阅读(...) 评论(...) 编辑 收藏