YBB.DBUtils用法

• SQL Server:

using (AdoNetHelper Db = AdoNetHelper.ThreadInstance("data source=;user id=sa;password=;Initial Catalog=*;", DbProviderType.SqlServer))) { 。。。。。 }//Dispose可关闭所有内部连接。

2、常用的命令：

• Db.OpenNewConnection()
• Db.CreateNewCommand(sql, conn)
• Db.BeginNewTrans(conn)
• Db.CreateNewCommand(sql, trans);
• Db.MakeInParam(":a", **)
• DataSet ds = Db.ExecuteDataset(conn, "GetOrders", 24, 36);

以及所有DbHelper中的方法。

3、打开连接和创建命令，执行读数据

举例：

string  sql = "select 1 from  **";
        DbConnection conn = null;
        try
        {
            conn  = Db.OpenNewConnection();
            DbCommand command = Db.CreateNewCommand(sql, conn);
            DbDataReader  dr = command.ExecuteReader(); //   Convert.ToInt32(command.ExecuteScalar()); //   DataTable dt1 = Db.ExecuteDataset(command);
            if (rd.HasRows)
            {
                dr.Close();
                return true;
            }
            // while (dr.Read())
            //{
            //       List1.Add(dr[0].ToString().Trim());
            //  }
            dr.Close();
        }
        finally
        {
            Db.CloseConnection(conn);
        }

4、带参数执行命令

举例：

        sql = "insert into table1 (column1,column2) values (:a,:b)";//sql server为@符号
        DbConnection conn = Db.Conn;
        using (DbCommand command = Db.CreateNewCommand(sql, conn))
         {
             command.Parameters.Add(Db.MakeInParam(":a", **));
             command.Parameters.Add(Db.MakeInParam(":b", **));
             command.ExecuteNonQuery();
         }

5、利用事务处理更新操作。

        int rows = 0;
        DbConnection   conn  = Db.OpenNewConnection();
        DbTransaction trans = Db.BeginNewTrans(conn);
        DbCommand command = Db.CreateNewCommand(sql, trans);
        try
        {  
            sql = "delete **";
            command.CommandText = sql;
            rows = command.ExecuteNonQuery();

            sql = "update  **";
            command.CommandText = sql;
            rows = command.ExecuteNonQuery();
         
            trans.Commit();
        }
        catch (Exception)
        {
            if (trans != null)
            {
                trans.Rollback();
            }
            throw;
        }
        return rows;

6、插入操作返回最新值。

        string lastId = "";
        DbTransaction trans = null;
        try
        {
            DbConnection conn = Db.Conn;
            trans = Db.BeginNewTrans(conn);

            sql = "insert intotable1 (column1,column2) values (*,*) RETURNING ID into :recid ";

            command = Db.CreateNewCommand(sql, trans);
            DbParameter paralastId = Db.MakeOutParam(":recid", DbType.String, 20);
            paralastId.Direction = ParameterDirection.ReturnValue;
            command.Parameters.Add(paralastId);

            command.ExecuteNonQuery();
            command.Parameters.Clear();
            lastId = paralastId.Value.ToString();

            trans.Commit();
        }
        catch (Exception)
        {
            if (trans != null)
            {
                trans.Rollback();
            }
            throw;
        }

7、处理存储过程的输入输出参数。

        string sql = "sp***";
        DbConnection conn = Db.Conn;
        command = Db.CreateNewCommand(sql, conn);
        command.CommandType = CommandType.StoredProcedure;

        command.Parameters.Add(Db.MakeInParam("line", Line));
        command.Parameters.Add(Db.MakeInParam("model", PartNumber));

        DbParameter qty = Db.MakeOutParam("qty", 0);
        qty.Direction = ParameterDirection.Output;
        command.Parameters.Add(qty);

        command.ExecuteNonQuery();

        returnValue = Convert.ToInt32(((OracleDecimal)(command.Parameters["qty"].Value)).Value);
        command.Parameters.Clear();
        command.CommandType = CommandType.Text;

8、类图如下：

YBB.DBUtils用法

标签：dbutils   string   red   dispose   lin   sdi   tor   src   let