事务
1、创建事务的结构
SqlConnection sqlConnection = new SqlConnection();
...初始化连接
// 开启事务
SqlTransaction sqlTransaction = sqlConnection.BeginTransaction();
// 将事务应用于Command
SqlCommand sqlCommand = new SqlCommand();
sqlCommand.Connection = sqlConnection;
sqlCommand.Transaction = sqlTransaction;
try
{
// 利用sqlcommand进行数据操作
...
// 成功提交
sqlTransaction.Commit();
}
catch(Exception ex)
{
// 出错回滚
sqlTransaction.Rollback();
}
2、简单例子
{
DataTable dt = new DataTable();
System.Data.SqlClient.SqlConnection cnn = new System.Data.SqlClient.SqlConnection("连接字符串");
System.Data.SqlClient.SqlCommand cm = new System.Data.SqlClient.SqlCommand();
cm.Connection = cnn;
cnn.Open();
System.Data.SqlClient.SqlTransaction trans = cnn.BeginTransaction();
try
{
foreach(DataRow dr in dt.Rows)
{
cm.CommandText = "update [表] set [数量] = @amount where productID = @productID";
cm.Parameters.Add("@amount",SqlDbType.Int);
cm.Parameters["@amount"].Value = Convert.ToInt32(dr["amount"]);
cm.Parameters.Add("@productID",SqlDbType.VarChar);
cm.Parameters["@productID"].Value = dr["productID"].ToString();
cm.ExecuteNonQuery();
}
trans.Commit();
}
catch
{
trans.Rollback();
}
finally
{
cnn.Close();
trans.Dispose();
cnn.Dispose();
}
}
3、SQl server中的事务例子
begin transaction
save transaction A
insert into demo values('BB','B term')
rollback TRANSACTION A
create table demo2(name varchar(10),age int)
insert into demo2(name,age) values('lis',1)
rollback transaction
insert into demo values('BB','B term')
commit TRANSACTION A
commit TRANSACTION
4、注意
1。事务必须在连接打开后BeginTransaction();
2.事务添加到SqlCommand（sqlCommand.Transaction = sqlTransaction; ）
3、其他数据库对应做相应调整
4、可以用微软提供的一个dll,很方便.