C#操作SqlServer数据库事务

“抚琴”的人2024-10-16 18:37
操作事务

```cs
// 1.连接数据库
string connstring = @"Server = 李昊轩-212\MSSQLSERVER11;Database = Student;uid = sa;Pwd= 123456";
SqlConnection conn = new SqlConnection(connstring);
conn.Open();
// 2.创建多个sql语句
List<string> list = new List<string>() {
    "delete from XueSheng where StudentId = 1004",
    "delete from XueSheng where StudentId = 100"
};
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
try
{
    // 3.开启事务
    cmd.Transaction = conn.BeginTransaction();
    foreach (string s in list)
    {
        // 4.设置执行的sql
        cmd.CommandText = s;
        cmd.ExecuteNonQuery();
    }
    // 5. 如果没有出错 提交事务
    cmd.Transaction.Commit();
}
// 6. 如果执行错误 跳转到catch里面 在catch执行回滚
catch (Exception e)
{
    if (cmd.Transaction != null)
    {
        cmd.Transaction.Rollback(); // 执行sql语句有错误的情况 执行回滚操作
    }
    throw new Exception("执行删除sql事务出错:" + e.Message);
}
finally
{
    // 7.不管是否执行有误 把事务设置为null 清除事务
    if(cmd.Transaction!= null)
    {
        cmd.Transaction = null;
    }
    conn.Close();
}
```