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mysql> select CONCAT('My', 'S', 'QL');
-> 'MySQL'
mysql> select CONCAT('My', NULL, 'QL');
-> NULL
mysql> select CONCAT(14.3);
-> '14.3'
È磺update test set ID=concat(ID,'ABC');
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MysqlµÄDBHelper.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using MySql.Data.MySqlClient;
namespace i_salesDAL
{
public class DBHelper
{
//Òýµ¼Êý¾Ý¿âÁ¬½ÓÊý¾Ý¿âµ÷ÓÃWeb.ConfigÎļþ
private static MySqlConnection connection;
//´´½¨ ......

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Ç×°®µÄÕü¾ÈMySQLµÄÖйúÇ©ÃûÖ§³ÖÕß:
    Å·ÃË¿ÉÄÜÎÞ·¨Õü¾ÈMySQL, ÖйúºÍ¶íÂÞ˹¿ÉÄÜÊÇÕü¾ÈMySQLµÄÏ£ÍûÖ®ËùÔÚ¡£ÖйúÓµÓÐÇ¿´ó¡¢¶ÀÁ¢ÒÔ¼°×ÔÐŵ ......

Quick Test Setup of MySQL Cluster


To familiarize you with the basics, we will describe the simplest
possible configuration for a functional MySQL Cluster. After this,
you should be able to design your desired setup from the
information provided in the other relevant sections of this
chapter.
......

MySQL Cluster Configuration — Basic Example


To support MySQL Cluster, you will need to update
my.cnf
as shown in the following example.
You may also specify these parameters on the command line when
invoking the executables.

Note
The options shown here should not be confused with thos ......

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