MySQLDriverCS Exception: MySQLDriverCS Error: wrong query.No database selected
AspNet连接mysql数据库
步骤：1.首先下载dll网址为：http://d.download.csdn.net/down/2625418/tailwind_cn
下下来之后又两个文件：libmySQL.dll和MySQLDriverCS.DLL
将他们引用到项目中来，但是第一个libmySql.dll没法引入，这时将libmySql.dll放到C:C:\WINDOWS\system32底下：
这样里面的文件就可以引用。
先把代码贴出来，方便大家建立测试：
前台：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div> </div>
<asp:TextBox ID="tbName" runat="server"></asp:TextBox>
<asp:TextBox ID="tbAddress" runat="server"></asp:TextBox>
<asp:TextBox ID="tbTelephone" runat="server"></asp:TextBox>
<asp:Button ID="btnSubmit" runat="server" OnClick="btnSubmit_Click" Text="insert data" /><br />
<div>
<asp:GridView ID="gwShow" runat="server">
</asp:GridView>
</div>
</form>
</body>
</html>
后台：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using MySQLDriverCS;
using System.Data;
using System.Configuration;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
BindData();
}
private void BindData()
{
string constr = ConfigurationManager.AppSettings["JICQMySql"];
MySQLConnection conn = null;
// conn = new MySQLConnection(new MySQLConnectionString("localhost", "protege_db", "root", "sdie?!3406").AsString);
conn=new MySQLConnection(constr);
//本地数据库 数据库名字 用户名root 密码
conn.Open();
MySQLCommand commn = new MySQLCommand("set names gb2312", conn);
commn.ExecuteNonQuery(); //设置set names gb2312 解决乱码
string sql = "select * from animal";
MySQLDataAdapter mda = new MySQLDataAdapter(sql, conn);
DataSet ds = new DataSet();
mda.Fill(ds, "tb");
this.gwShow.DataSource = ds.Tables["tb"];
gwShow.DataBind();
conn.Close();
}
protected void btnSubmit_Click(object sender, EventArgs e)
{
MySQLConnection conn = null;
conn = new MySQLConnection(new MySQLConnectionString("localhost", "protege_db", "root", "sdie?!3406").AsString);
conn.Open();
MySQLCommand commn = new MySQLCommand("set names gb2312", conn);
commn.ExecuteNonQuery();
MySQLCommand comm = new MySQLCommand(string.Format("insert into animal (frame,frame_type,slot,facet,is_template,value_index,value_type) values ('{0}','{1}','{2}',1,1,1,1)", tbName.Text.Trim(), tbAddress.Text.Trim(), tbTelephone.Text.Trim()), conn);
comm.ExecuteNonQuery();
conn.Close();
BindData();
}
}
WebConfig中：
连接字符串为：
<appSettings> <add key ="JICQMySql" value="Server=.; Data Source=protege_db;USER id=root;PASSWORD=sdie?!3406;" />
</appSettings>
数据库，用户名和密码，查询的表大家根据自己的情况设定；
然后在浏览器中查看即可。
注意的是：在Web.Config 中的配置，有严格的限定，比如，Data Source不能改为：DataBase。User ID
不能改为：userID，Password不能改为：pwd等等，
标题中出的错误原因为：Data Source改为了DataBase，改回来即可。
MySQLDriverCS Exception: MySQLDriverCS Error: can't connect.Access denied for user 'ODBC'@'localhost' (using password: YES) 错误：
是因为：User ID 改为了uid ,
MySQLDriverCS Exception: MySQLDriverCS Error: can't connect.Access denied for user 'root'@'localhost' (using password: NO)这个错误是因为：
password改为了pwd所致，改回来即可。