操作Sql数据库帮助类

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Data.SqlClient;

using System.Data;



namespace DateBase

{

    public class Helper

    {

        /// <summary>

        /// 定义SqlConnection

        /// </summary>

        public static SqlConnection conn = null;



        /// <summary>

        /// 数据库连接 public static string str = ConfigurationManager.AppSettings["MySqlConncetion"];

        /// </summary>

        public static string str = "Data Source=.;Initial Catalog=MyOffice;User ID=www_jy;password=*****************";



        /// <summary>

        /// 事物回滚

        /// </summary>

        public static SqlTransaction trans = null;



        /// <summary>

        /// 打开数据库连接

        /// </summary>

        public static SqlConnection Connection

        {

            get

            {

                try

                {

                    if (conn == null)

                    {

                        conn = new SqlConnection(str);

                        conn.Open();

                    }

                    else if (conn.State == ConnectionState.Closed)

                    {

                        conn.Open();

                    }

                    else if (conn.State == ConnectionState.Broken)

                    {

                        conn.Close();

                        conn.Open();

                    }

                }

                catch (Exception e)

                {

                    //抛出错误

                }



                return conn;

            }

        }



        /// <summary>

        /// 打开事物

        /// </summary>

        public static void OpenTrans()

        {

            try

            {

                trans = Connection.BeginTransaction();

            }

            catch (Exception e)

            {

                //抛出异常

            }

        }



        /// <summary>

        /// 事物提交

        /// </summary>

        public static void CommitTrans()

        {

            trans.Commit();

        }



        /// <summary>

        /// 事物回滚

        /// </summary>

        public static void RollBackTrans()

        {

            trans.Rollback();

        }



        /// <summary>

        /// 执行增、删、改

        /// </summary>

        /// <param name="sql"></param>

        /// <returns></returns>

        public static int GetExecute(string sql)

        {

            int num = 0;

            try

            {

                SqlCommand cmd = new SqlCommand(sql, Connection);

                cmd.Transaction = trans;

                num = cmd.ExecuteNonQuery();

            }

            catch (Exception e)

            {

                //抛出异常

                RollBackTrans();

            }

            finally

            {

                //关闭数据库连接

                conn.Close();

            }

            return num;

        }



        /// <summary>

        /// 有参数执行增、删、改操作

        /// </summary>

        /// <param name="sql"></param>

        /// <param name="pare"></param>

        /// <returns></returns>

        public static int GetExecute(string sql, SqlParameter[] pare)

        {

            int num = 0;

            try

            {

                SqlCommand cmd = new SqlCommand(sql, Connection);

                cmd.Parameters.AddRange(pare);

                cmd.Transaction = trans;

                num = cmd.ExecuteNonQuery();

            }

            catch (Exception e)

            {

                //抛出异常

                RollBackTrans();

            }

            finally

            {

                //关闭数据库连接

                conn.Close();

            }

            return num;

        }



        /// <summary>

        /// 查询条数

        /// </summary>

        /// <param name="sql"></param>

        /// <returns></returns>

        public static int GetExecuteScalar(string sql)

        {

            int num = 0;

            try

            {

                SqlCommand cmd = new SqlCommand(sql, Connection);

                num = Convert.ToInt32(cmd.ExecuteScalar());

            }

            catch (Exception e)

            {

                //抛出异常

            }

            finally

            {

                //关闭数据库连接

                conn.Close();

            }

            return num;

        }



        /// <summary>

        /// 条件查询

        /// </summary>

        /// <param name="sql"></param>

        /// <param name="pare"></param>

        /// <returns></returns>

        public static int GetExecuteScalar(string sql, SqlParameter[] pare)

        {

            int num = 0;

            try

            {

                SqlCommand cmd = new SqlCommand(sql, Connection);

                cmd.Parameters.AddRange(pare);

                num = Convert.ToInt32(cmd.ExecuteScalar());

            }

            catch (Exception e)

            {

                //抛出异常

            }

            finally

            {

                //关闭数据库连接

                conn.Close();

            }

            return num;

        }



        /// <summary>

        /// 查找数据库

        /// </summary>

        /// <param name="sql"></param>

        /// <returns></returns>

        public static DataSet GetDataSet(string sql)

        {

            DataSet ds = new DataSet();

            try

            {

                SqlDataAdapter adapter = new SqlDataAdapter(sql, Connection);

                adapter.Fill(ds);

            }

            catch (Exception e)

            {

                //抛出异常

            }

            finally

            {

                //关闭数据库连接

                conn.Close();

            }

            return ds;

        }



        /// <summary>

        /// 有参查找数据库

        /// </summary>

        /// <param name="sql"></param>

        /// <param name="pare"></param>

        /// <returns></returns>

        public static DataSet GetDataSet(string sql, SqlParameter[] pare)

        {

            DataSet ds = new DataSet();

            try

            {

                SqlCommand cmd = new SqlCommand(sql, Connection);

                cmd.Parameters.AddRange(pare);

                SqlDataAdapter adapter = new SqlDataAdapter(cmd);

                adapter.Fill(ds);

            }

            catch (Exception e)

            {

                //抛出异常

            }

            finally

            {

                //关闭数据库连接

                conn.Close();

            }

            return ds;

        }

    }

}