dbsql

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Collections;
using System.Data;
using System.IO;
using System.Web;
using System.Web.Util;

namespace FML.Utility
{
    /// <summary>
    /// Copyright (C) 2004-2008 LiTianPing
    /// 数据访问基础类(基于SQLServer)
    /// 用户可以修改满足自己项目的需要。
    /// </summary>
    public abstract class DbHelperSQL
    {
        //数据库连接字符串(web.config来配置)

       // public static string connectionString = @"server=127.0.0.1;user id=sa;password=123456;database=msgData";//
        public static string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;

        public DbHelperSQL()
        {
        }

        #region 记录日志文件 LastModified:2009-6-8 by uEyoogoCommon
        private static void writeLog(Exception ex, string ExecuteString,string strSql)
        {
            string LogFilename = VirtualPathUtility.ToAbsolute("~/") + "log/sqlErrorLog" + StrObj.FormatDatetime(DateTime.Now, 10) + ".txt";

            string BR = Environment.NewLine, BRBR = string.Format("{0}{1}", Environment.NewLine, Environment.NewLine);
            string errmsg = "";
            try { errmsg = string.Format("{0}{1}{2}{3}", ex.Message, BR, ex.StackTrace, BR); }
            catch { }
            string log = string.Concat(new object[]{
                 "["
                , ExecuteString
                ,"-"
                , StrObj.FormatDatetime(DateTime.Now, 6)
                ,"]:"
                ,strSql
                , BR
                , errmsg
                , BR
                , HttpContext.Current.Request.RawUrl
                , BRBR
            });
            try
            {
                IO.WriteTxtFile(LogFilename, log, true);
            }
            catch {}
        }
        #endregion

        #region 公用方法

        public static int GetMaxID(string FieldName, string TableName)
        {
            string strsql = "select max(" + FieldName + ")+1 from " + TableName;
            object obj = GetSingle(strsql);
            if (obj == null)
            {
                return 1;
            }
            else
            {
                return int.Parse(obj.ToString());
            }
        }

        public static int GetRecordCount(string TableName, string strWhere)
        {
            string strSql = "select count(1) from " + TableName;
            if (strWhere.Trim() != "")
            {
                strSql = strSql +strWhere;
            }
            object obj = GetSingle(strSql);
            if (obj == null)
            {
                return -1;
            }
            else
            {
                return int.Parse(obj.ToString());
            }
        }

        public static bool Exists(string strSql, params SqlParameter[] cmdParms)
        {
            object obj = 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;
            }
        }

        //public static void writelog(string loginfo)
        //{
        //    string FullFileName = ("d:\\log.txt");
        //    // string FullFileName = Session["RootPath"];
        //    FileStream fs = new FileStream(FullFileName, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.Read);
        //    fs.Seek(0, SeekOrigin.End);
        //    StreamWriter sw = new StreamWriter(fs);
        //    sw.WriteLine(loginfo);
        //    sw.Close();
        //    fs.Close();/**/
        //}

#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)
        {
            int rows = 0;
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                using (SqlCommand cmd = new SqlCommand(SQLString, connection))
                {
                    try
                    {
                        //    writelog(SQLString);
                        connection.Open();
                        rows = cmd.ExecuteNonQuery();
                    }
                    catch (System.Data.SqlClient.SqlException E)
                    {
                        connection.Close();
                        writeLog(E, "ExecuteSql",SQLString);
                        //throw new Exception(E.Message);
                    }
                }
            }
            return rows;
        }

        /// <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 bool ExecuteSqlTran(ArrayList SQLStringList)
        {
            bool success = false;
            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();
                    success = true;
                }
                catch (System.Data.SqlClient.SqlException E)
                {
                    tx.Rollback();
                    writeLog(E,"ExecuteSqlTran",SQLStringList.ToString());
                    //throw E;
                }
                finally
                {
                    conn.Close();
                }
            }
            return success;
        }
        /// <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)
        {
            int rows = 0;
            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();
                    rows = cmd.ExecuteNonQuery();
                    //return rows;
                }
                catch (System.Data.SqlClient.SqlException E)
                {
                    writeLog(E,"ExecuteSql",SQLString);
                    //throw new Exception(E.Message);
                }
                finally
                {
                    cmd.Dispose();
                    connection.Close();
                }
            }
            return rows;
        }
        /// <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)
        {
            int rows = 0;
            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();
                    rows = cmd.ExecuteNonQuery();
                    //return rows;
                }
                catch (System.Data.SqlClient.SqlException E)
                {
                    writeLog(E, "ExecuteSqlInsertImg", strSQL);
                    //throw new Exception(E.Message);
                }
                finally
                {
                    cmd.Dispose();
                    connection.Close();
                }
            }
            return rows;
        }

        /// <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)
        {
            object obj = null;
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                using (SqlCommand cmd = new SqlCommand(SQLString, connection))
                {
                    try
                    {
                        connection.Open();
                        obj = cmd.ExecuteScalar();
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                        {
                            //return null;
                            obj = "";
                        }
                        //else
                        //{
                        //    return obj;
                        //}
                    }
                    catch (System.Data.SqlClient.SqlException e)
                    {
                        connection.Close();
                        writeLog(e,"GetSingle",SQLString);
                    }
                }
            }
            return obj;
        }
        /// <summary>
        /// 执行查询语句，返回SqlDataReader
        /// </summary>
        /// <param name="strSQL">查询语句</param>
        /// <returns>SqlDataReader</returns>
        public static SqlDataReader ExecuteReader(string strSQL)
        {
            SqlDataReader myReader = null;
            SqlConnection connection = new SqlConnection(connectionString);
            SqlCommand cmd = new SqlCommand(strSQL, connection);
            try
            {
                connection.Open();
                myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                //return myReader;
            }
            catch (System.Data.SqlClient.SqlException e)
            {
                connection.Close();
                writeLog(e, "SqlDataReader", strSQL);
            }
            return myReader;
        }
        /// <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);
                }
                catch (System.Data.SqlClient.SqlException ex)
                {
                    connection.Close();
                    writeLog(ex,"Query",SQLString);
                }
                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)
        {
            int rows = 0;
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                using (SqlCommand cmd = new SqlCommand())
                {
                    try
                    {
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                        rows = cmd.ExecuteNonQuery();
                        cmd.Parameters.Clear();
                    }
                    catch (System.Data.SqlClient.SqlException E)
                    {
                        connection.Close();
                        writeLog(E, "ExecuteSql", SQLString);
                    }
                }
            }
            return rows;
        }

        /// <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 bool ExecuteSqlTran(Hashtable SQLStringList)
        {
            bool success = false;
            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();
                        success = true;
                    }
                    catch (System.Exception e)
                    {
                        success = false;
                        trans.Rollback();
                        writeLog(e, "ExecuteSqlTran", SQLStringList.ToString());
                    }
                    finally
                    {
                        conn.Close();
                    }
                }
            }
            return success;
        }

        /// <summary>
        /// 执行查询语句，返回SqlDataReader
        /// </summary>
        /// <param name="strSQL">查询语句</param>
        /// <returns>SqlDataReader</returns>
        public static SqlDataReader ExecuteReader(string SQLString, params SqlParameter[] cmdParms)
        {
            SqlDataReader myReader = null;
            SqlConnection connection = new SqlConnection(connectionString);
            SqlCommand cmd = new SqlCommand();
            try
            {
                PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                //return myReader;
            }
            catch (System.Data.SqlClient.SqlException e)
            {
                connection.Close();
                writeLog(e, "ExecuteReader", SQLString);
            }
            return myReader;
        }

        /// <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();
                cmd.CommandTimeout = 120;
                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)
                    {
                        connection.Close();
                        writeLog(ex, "Query", SQLString);
                    }
                    return ds;
                }
            }
        }

        public 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 parm in cmdParms)
                    cmd.Parameters.Add(parm);
            }
        }

#endregion

#region 存储过程操作

        /// <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>
        /// <returns>SqlDataReader</returns>
        public static SqlDataReader RunProcedure(string storedProcName, IDataParameter[] parameters)
        {
            SqlConnection connection = new SqlConnection(connectionString);
            SqlDataReader returnReader = null;
            connection.Open();
            SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
            command.CommandType = CommandType.StoredProcedure;
            try
            {
                returnReader = command.ExecuteReader(CommandBehavior.CloseConnection);
            }
            catch (Exception ex)
            {
                connection.Close();
                writeLog(ex, "RunProcedure", storedProcName);
            }
            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;
            }
        }

        /// <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)
            {
                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;
            }
        }
        //存储过程操作
        public static bool ExecuteProcedure(string storedProcName, IDataParameter[] parameters)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                try
                {
                    connection.Open();
                    SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters); ;
                    command.ExecuteNonQuery();
                    return true;
                }
                catch (SqlException ex)
                {
                    connection.Close();
                    writeLog(ex, "ExecuteProcedure", storedProcName);
                    return false;
                }
            }
        }

        /// <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

        #region 自定义存储过程操作
        /// <summary>
        /// 创建 SqlCommand 对象实例
        /// by gaoll 2007-05-16
        /// </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 BuildStringCommand(SqlConnection connection, string storedProcName, IDataParameter[] parameters)
        {
            SqlCommand command = BuildQueryCommand(connection, storedProcName, parameters);
            return command;
        }

        /// <summary>
        /// 执行存储过程，返回return值
        /// by crl 2007-05-16
        /// </summary>
        /// <param name="storedProcName">存储过程名</param>
        /// <param name="parameters">存储过程参数</param>
        /// <returns></returns>
        public static DataSet QueryProcedure(string storedProcName, IDataParameter[] parameters)
        {
            DataSet ds = new DataSet();
            try
            {
                using (SqlConnection connection = new SqlConnection(connectionString))
                {
                    connection.Open();
                    SqlCommand command = BuildStringCommand(connection, storedProcName, parameters);
                    command.ExecuteNonQuery();
                    SqlDataAdapter dp = new SqlDataAdapter(command);
                    ds = new DataSet();
                    dp.Fill(ds);
                    return ds;
                }
            }
            catch (SqlException ex)
            {
                writeLog(ex, "QueryProcedure", storedProcName);
                return ds;
            }
        }
        #endregion 自定义存储过程操作
    }
}