.NET DataHelper共通类

最近在做.NET开发时,每个项目每次都要写数据库连接,CRUD的操作,效率很慢,在时间之余整理了一个通用类(DataHelper.cs)。希望帮助学习的人,同样哪里有错误请诸位指正(改不改我的事,哈哈哈)

→→→→→多了不说,少了不唠。进入正题→→→→

using System;
using System.Collections;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.Common;
using System.Linq;
using System.Web;

namespace APITool.Util
{
    public class DataHelper
    {
        protected static string connectionString = ConfigurationManager.ConnectionStrings["APITool.Properties.Settings.SqlServerConnection"].ConnectionString;
        DbProviderFactory provider;

        public DataHelper()
        {
            provider = DbProviderFactories.GetFactory(ConfigurationManager.ConnectionStrings["APITool.Properties.Settings.SqlServerConnection"].ProviderName);
        }

        /// 
        /// 执行SQL语句,返回记录数
        /// 
        /// SQL语句
        /// 影响的记录数
        public int ExecuteSql(string SQLString)
        {
            using (DbConnection connection = provider.CreateConnection())
            {
                connection.ConnectionString = connectionString;
                using (DbCommand cmd = provider.CreateCommand())
                {
                    cmd.Connection = connection;
                    cmd.CommandText = SQLString;
                    try
                    {
                        connection.Open();
                        int rows = cmd.ExecuteNonQuery();
                        return rows;
                    }
                    catch (DbException e)
                    {
                        connection.Close();
                        connection.Dispose();
                        throw new Exception(e.Message);
                    }
                }
            }
        }

        /// 
        /// 执行多条SQL语句,实现数据库事务。
        /// 
        /// 多条SQL语句        
        public void ExecuteSqlTran(ArrayList SQLStringList)
        {
            using (DbConnection conn = provider.CreateConnection())
            {
                conn.ConnectionString = connectionString;
                conn.Open();
                using (DbCommand cmd = provider.CreateCommand())
                {
                    cmd.Connection = conn;
                    using (DbTransaction 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 (DbException ex)
                        {
                            tx.Rollback();
                            conn.Close();
                            conn.Dispose();
                            throw ex;
                        }
                    }
                }
            }
        }

        /// 
        /// 执行一条计算查询结果语句,返回查询结果(object)。
        /// 
        /// 计算查询结果语句
        /// 查询结果(object)
        public object GetSingle(string SQLString)
        {
            using (DbConnection connection = provider.CreateConnection())
            {
                connection.ConnectionString = connectionString;
                using (DbCommand cmd = provider.CreateCommand())
                {
                    cmd.Connection = connection;
                    cmd.CommandText = SQLString;
                    try
                    {
                        connection.Open();
                        object obj = cmd.ExecuteScalar();
                        if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
                        {
                            return null;
                        }
                        else
                        {
                            return obj;
                        }
                    }
                    catch (DbException e)
                    {
                        connection.Close();
                        connection.Dispose();
                        throw new Exception(e.Message);
                    }
                }
            }
        }

        /// 
        /// 执行查询语句,返回SqlDataReader
        /// 
        /// 查询语句
        /// SqlDataReader
        public DbDataReader ExecuteReader(string strSQL)
        {
            DbConnection connection = provider.CreateConnection();
            connection.ConnectionString = connectionString;
            DbCommand cmd = provider.CreateCommand();
            cmd.Connection = connection;
            cmd.CommandText = strSQL;
            try
            {
                connection.Open();
                DbDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                return myReader;
            }
            catch (System.Data.Common.DbException e)
            {
                connection.Close();
                connection.Dispose();
                throw new Exception(e.Message);
            }

        }

        /// 
        /// 执行查询语句,返回DataSet
        /// 
        /// 查询语句
        /// DataSet
        public DataSet GetDataSet(string SQLString)
        {
            using (DbConnection connection = provider.CreateConnection())
            {
                connection.ConnectionString = connectionString;
                using (DbCommand cmd = provider.CreateCommand())
                {
                    cmd.Connection = connection;
                    cmd.CommandText = SQLString;
                    try
                    {
                        DataSet ds = new DataSet();
                        DbDataAdapter adapter = provider.CreateDataAdapter();
                        adapter.SelectCommand = cmd;
                        adapter.Fill(ds, "ds");
                        return ds;
                    }
                    catch (DbException ex)
                    {
                        connection.Close();
                        connection.Dispose();
                        throw new Exception(ex.Message);
                    }
                }
            }
        }
        
        /// 
        /// 执行SQL语句,返回影响的记录数
        /// 
        /// SQL语句
        /// 影响的记录数
        public int ExecuteSql(string SQLString, DbParameter[] cmdParms)
        {
            using (DbConnection connection = provider.CreateConnection())
            {
                connection.ConnectionString = connectionString;
                using (DbCommand cmd = provider.CreateCommand())
                {
                    cmd.Connection = connection;
                    cmd.CommandText = SQLString;
                    try
                    {
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                        int rows = cmd.ExecuteNonQuery();
                        cmd.Parameters.Clear();
                        return rows;
                    }
                    catch (DbException E)
                    {
                        connection.Close();
                        connection.Dispose();
                        throw new Exception(E.Message);
                    }
                }
            }
        }

        /// 
        /// 执行多条SQL语句,实现数据库事务。
        /// 
        /// SQL语句的哈希表(key为sql语句,value是该语句的SqlParameter[])
        public void ExecuteSqlTran(Hashtable SQLStringList)
        {
            using (DbConnection conn = provider.CreateConnection())
            {
                conn.ConnectionString = connectionString;
                conn.Open();
                using (DbTransaction trans = conn.BeginTransaction())
                {
                    using (DbCommand cmd = provider.CreateCommand())
                    {
                        try
                        {
                            //循环
                            foreach (DictionaryEntry myDE in SQLStringList)
                            {
                                string cmdText = myDE.Key.ToString();
                                DbParameter[] cmdParms = (DbParameter[])myDE.Value;
                                PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
                                int val = cmd.ExecuteNonQuery();
                                cmd.Parameters.Clear();
                            }
                            trans.Commit();
                        }
                        catch (DbException ex)
                        {
                            trans.Rollback();
                            conn.Close();
                            conn.Dispose();
                            throw ex;
                        }
                    }
                }
            }
        }

        /// 
        /// 执行一条计算查询结果语句,返回查询结果(object),返回首行首列的值;
        /// 
        /// 计算查询结果语句
        /// 查询结果(object)
        public object GetSingle(string SQLString, DbParameter[] cmdParms)
        {
            using (DbConnection connection = provider.CreateConnection())
            {
                connection.ConnectionString = connectionString;
                using (DbCommand cmd = provider.CreateCommand())
                {
                    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 (DbException e)
                    {
                        connection.Close();
                        connection.Dispose();
                        throw new Exception(e.Message);
                    }
                }
            }
        }

        /// 
        /// 执行查询语句,返回SqlDataReader
        /// 
        /// 查询语句
        /// SqlDataReader
        public DbDataReader ExecuteReader(string SQLString, DbParameter[] cmdParms)
        {
            DbConnection connection = provider.CreateConnection();
            connection.ConnectionString = connectionString;
            DbCommand cmd = provider.CreateCommand();
            try
            {
                PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                DbDataReader myReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                cmd.Parameters.Clear();
                return myReader;
            }
            catch (DbException e)
            {
                connection.Close();
                connection.Dispose();
                throw new Exception(e.Message);
            }

        }

        /// 
        /// 执行查询语句,返回DataTable
        /// 
        /// 查询语句
        /// DataTable
        public DataTable GetDataSet(string SQLString, DbParameter[] cmdParms)
        {
            using (DbConnection connection = provider.CreateConnection())
            {
                connection.ConnectionString = connectionString;
                using (DbCommand cmd = provider.CreateCommand())
                {
                    using (DbDataAdapter da = provider.CreateDataAdapter())
                    {
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                        da.SelectCommand = cmd;
                        DataSet ds = new DataSet();
                        try
                        {
                            da.Fill(ds, "ds");
                            cmd.Parameters.Clear();
                            return ds.Tables[0];
                        }
                        catch (DbException ex)
                        {
                            connection.Close();
                            connection.Dispose();
                            throw new Exception(ex.Message);
                        }
                    }
                }
            }
        }

        private void PrepareCommand(DbCommand cmd, DbConnection conn, DbTransaction trans, string cmdText, DbParameter[] 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 (DbParameter parm in cmdParms)
                {
                    cmd.Parameters.Add(parm);
                }
            }
        }
    }
}

如有侵权请联系我删除。
结束!!!!!

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