(6)C#事务处理

为了方便移到了ADO.NET分类里

事务的主要特征是，任务要么全部完成，要么都不完成

事务常用于写入或更新数据库中的数据。将数据写入文件或注册表也可以使用事物。

ADO.NET不支持跨越多个连接的事物，它总是关联到一个连接上的本地事务。

1.引入dll -----  System.Transactions

2.引入命名空间

using System.Transactions

1.引入dll---- System.Data.OracleClinet

2.引入命名空间

using System.Data.OleDb;

不带事物的多表增删改

            string str = ConfigurationManager.AppSettings["con_MES"];
            OleDbConnection conn = new OleDbConnection(str);
            using (conn)
            {
                conn.Open();
                try
                { 
                    if (conn.State == ConnectionState.Open)
                    {
                        string sql1 = "insert into fruits (name, place, amount) values ('椰子', '海南', '500')";
                        string sql2 = "update pingtable set targetip='192.168.55.55' where id=1102";
                        OleDbCommand command1 = new OleDbCommand(sql1, conn);
                        OleDbCommand command2 = new OleDbCommand(sql2, conn);
                        command1.ExecuteNonQuery();
                        command2.ExecuteNonQuery();
                        MessageBox.Show("成功插入");
                    }

                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }
            MessageBox.Show("关闭连接");

单个Connection连接事务的多表增删改

            string str = ConfigurationManager.AppSettings["con_MES"];//连接字符串
            OleDbConnection conn = new OleDbConnection(str);
            using (conn)
            {
                conn.Open();
                OleDbTransaction OT=conn.BeginTransaction();//打开连接后才能赋值给事物
                try
                {
                    if (conn.State == ConnectionState.Open)
                    {
                        string sql1 = "insert into fruits (name, place, amount) values ('椰子', '海南', '500')";
                        string sql2 = "update pingtable set targetip='192.168.55.55' where id=1102";

                        OleDbCommand command1 = new OleDbCommand(sql1, conn, OT);
                        OleDbCommand command2 = new OleDbCommand(sql2, conn, OT);
                        command1.ExecuteNonQuery();
                        command2.ExecuteNonQuery();
                        OT.Commit();              //事务一定要有提交和回滚
                        MessageBox.Show("成功插入");
                    }

                }
                catch (Exception ex)
                {
                    OT.Rollback();
                    MessageBox.Show(ex.Message);
                }
                finally 
                {
                    conn.Close();          //using原本可以关闭连接，这里提前手动加了个关闭是为了尽早的关闭连接,这个finally方法可以不写
                    MessageBox.Show("关闭连接");
                }
            }

抽出模板

            using (OracleConnection connection = new OracleConnection(connectionString))
            {
                connection.Open();
                OracleTransaction transaction;
                transaction = connection.BeginTransaction();
                OracleCommand command = connection.CreateCommand();
                try
                {
                    transaction.Commit();
                }
                catch (Exception e)
                {
                    transaction.Rollback();
                    throw e;
                }
                finally
                {
                    connection.Close();
                }
            }