解决SqlTransaction用尽的问题(SQL处理超时)_MySQL
有时候程序处理的数据量比较小时,四平八稳,一切安然无恙,但数据量一大,原先潜伏的问题就暴露无遗了。
原访问数据库的代码为:
1SqlConnection conn = new SqlConnection(strConn);
2conn.Open();
3SqlTransaction trans = conn.BeginTransaction();
4try
5{
6 CEngine.ExecuteNonQuery(trans,CommandType.Text,sql);
7 trans.Commit();
8}
9catch(SqlException ex)
10{
11 trans.Rollback();
12 ErrorCode = ex.Number;
13 Info = "数据操作失败:" ex.Message;
14}
15finally
16{
17 trans.Dispose();
18 conn.Close();
19}
20
21
22
运行时,一旦出现数据量过大或者处理时间较长,则系统会提示出错。错误提示为“SqlTransaction已经用完;它再也不能使用。”
开始时,我怀疑是跟内存有关。因为系统需要做好事务回滚的准备,每执行一条插入或修改的SQL,都要有一定的开销,数据量一大,恐怕就吃不消了。不过我查了一下SQL SERVER的资料,未见提到内存的问题。
后来想到,数据库连接SqlTransaction有个时间问题。默认是15秒。数据量大的时候,这个时间很可能就不够了。于是改为:
1SqlConnection conn = new SqlConnection(strConn);
2conn.Open();
3SqlTransaction trans = conn.BeginTransaction();
4try
5{
6 SqlCommand cmd = new SqlCommand();
7 cmd.CommandType = CommandType.Text;
8 //连接时限改为300秒
9 cmd.CommandTimeout = 300;
10 cmd.CommandText = sql;
11 cmd.Connection = conn;
12 cmd.Transaction = trans;
13 cmd.ExecuteNonQuery();
14 trans.Commit();
15}
16catch(SqlException ex)
17{
18 trans.Rollback();
19 ErrorCode = ex.Number;
20 Info = "数据操作失败:" ex.Message;
21}
22finally
23{
24 trans.Dispose();
25 conn.Close();
26}
修改后在测试,问题解决:)

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