CUBRID学习笔记 33 net事务 cubrid教程示例

 

 

 

conn.BeginTransaction();

string sql = "create table t(idx integer)";
using (CUBRIDCommand command = new CUBRIDCommand(sql, conn))
{
    command.ExecuteNonQuery();
}

conn.Rollback();

conn.BeginTransaction();

sql = "create table t(idx integer, a varchar(20))";
using (CUBRIDCommand command = new CUBRIDCommand(sql, conn))
{
    command.ExecuteNonQuery();
}

conn.Commit();




//Here is a complete example:
using CUBRID.Data.CUBRIDClient;
using System.Diagnostics;

namespace TransactionExample
{
    class Program
    {
        private static void ExecuteSQL(string sql, CUBRIDConnection conn)
        {
            using (CUBRIDCommand cmd = new CUBRIDCommand(sql, conn))
            {
                cmd.ExecuteNonQuery();
            }
        }

        private static int GetTablesCount(string tableName, CUBRIDConnection conn)
        {
            int count = 0;
            string sql = "select count(*) from db_class where class_name = '" + tableName + "'";

            using (CUBRIDCommand cmd = new CUBRIDCommand(sql, conn))
            {
                count = (int)cmd.ExecuteScalar();
            }

            return count;
        }

        static void Main(string[] args)
        {
            CUBRIDConnectionStringBuilder sb = new CUBRIDConnectionStringBuilder("localhost", "demodb", "public", "", "33000");
            using (CUBRIDConnection conn = new CUBRIDConnection(sb.GetConnectionString()))
            {
                conn.Open();
                ExecuteSQL("drop table if exists t", conn);

                conn.BeginTransaction();

                string sql = "create table t(idx integer)";
                using (CUBRIDCommand command = new CUBRIDCommand(sql, conn))
                {
                    command.ExecuteNonQuery();
                }

                int tablesCount = GetTablesCount("t", conn);
                Debug.Assert(tablesCount == 1);

                conn.Rollback();

                //Verify the table does not exist
                tablesCount = GetTablesCount("t", conn);
                Debug.Assert(tablesCount == 0);

                conn.BeginTransaction();

                sql = "create table t(idx integer)";
                using (CUBRIDCommand command = new CUBRIDCommand(sql, conn))
                {
                    command.ExecuteNonQuery();
                }

                tablesCount = GetTablesCount("t", conn);
                Debug.Assert(tablesCount == 1);

                conn.Commit();

                tablesCount = GetTablesCount("t", conn);
                Debug.Assert(tablesCount == 1);

                conn.BeginTransaction();

                ExecuteSQL("drop table t", conn);

                conn.Commit();

                tablesCount = GetTablesCount("t", conn);
                Debug.Assert(tablesCount == 0);
                conn.Close();
            }
        }
    }
}