/**
* 作者：牛腩
* 创建时间：2010年3月7日17时35分
* 类说明：对MYSQL数据库的操作类
*/
using System;
using System.Data;
using MySql.Data.MySqlClient;
namespace Niunan.BYLW.Utility
{
/// <summary>对MYSQL数据库的操作类
///
/// </summary>
public class MYSQLHelper
{
private MySqlConnection conn = null;
private MySqlCommand cmd = null;
private MySqlDataReader sdr = null;
public MYSQLHelper()
{
//string connStr = WebConfigurationManager.ConnectionStrings["connStr"].ToString();
string connStr = "server=localhost;database=test;uid=root;pwd=123456;charset=utf8";
conn = new MySqlConnection(connStr);
}
/// <summary>创建Command对象
///
/// </summary>
/// <param name="sql">SQL语句</param>
public void CreateCommand(string sql)
{
conn.Open();
cmd = new MySqlCommand(sql, conn);
}
/// <summary>添加参数
///
/// </summary>
/// <param name="paramName">参数名称</param>
/// <param name="value">值</param>
public void AddParameter(string paramName, object value)
{
cmd.Parameters.Add(new MySqlParameter(paramName, value));
}
/// <summary>执行不带参数的增删改SQL语句
///
/// </summary>
/// <param name="cmdText">增删改SQL语句</param>
/// <param name="ct">命令类型</param>
/// <returns></returns>
public bool ExecuteNonQuery()
{
int res;
try
{
res = cmd.ExecuteNonQuery();
if (res > 0)
{
return true;
}
}
catch (Exception ex)
{
throw ex;
}
finally
{
if (conn.State == ConnectionState.Open)
{
conn.Close();
}
}
return false;
}
/// <summary>执行查询SQL语句
///
/// </summary>
/// <param name="cmdText">查询SQL语句</param>
/// <returns></returns>
public DataTable ExecuteQuery()
{
DataTable dt = new DataTable();
using (sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection))
{
dt.Load(sdr);
}
return dt;
}
/// <summary>返回查询SQL语句查询出的结果的第一行第一列的值
///
/// </summary>
/// <returns></returns>
public string ExecuteScalar()
{
string res = "";
try
{
object obj = cmd.ExecuteScalar();
if (obj != null)
{
res = obj.ToString();
}
}
catch (Exception ex)
{
throw ex;
}
finally
{
if (conn.State == ConnectionState.Open)
{
conn.Close();
}
}
return res;
}
}
}
