as怎么连接mysql as使用教程

连接数据库mysql采用什么技术

c#连接MySql数据库的方法

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一、用MySQLDriverCS连接MySQL数据库。

先下载和安装MySQLDriverCS，在安装文件夹下面找到MySQLDriver.dll，然后将MySQLDriver.dll添加引用到项目中。

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using MySQLDriverCS;

namespace jxkh

{

public partial class frmLogin : Form

{

public frmLogin()

{

InitializeComponent();

}

private void btnLogin_Click(object sender, EventArgs e)

{

MySQLConnectionString tConnStr = new MySQLConnectionString("10.14.55.46", "performance", "administrator", "1234567@byd", 3306);

MySQLConnection tConn = new MySQLConnection(tConnStr.AsString);

try

{

tConn.Open(); //打开连接

MySQLCommand cmd4 = new MySQLCommand("set names gb2312", tConn);

cmd4.ExecuteNonQuery();

string tCmd = "select ID,Name,PassWord from managers"; //命令语句

MySQLCommand cmd = new MySQLCommand(tCmd,tConn); //在定义的tConn对象上执行查询命令

MySQLDataReader tReader = cmd.ExecuteReaderEx();

if(tReader.Read()) // 一次读一条记录

{

if(tReader["Name"].ToString()==textBox1.TexttReader["PassWord"].ToString()==textBox2.Text)

{

frmJxkh myJxkh = new frmJxkh();

myJxkh.Show();

}

}

tConn.Close();//重要！要及时关闭

tReader.Close();

}

catch

{

tConn.Close();

}

}

}

}

二、通过ODBC访问mysql数据库：

1. 安装Microsoft ODBC.net；

2. 安装MDAC 2.7或者更高版本；

3. 安装MySQL的ODBC驱动程序；

4. 管理工具 - 数据源ODBC –配置DSN…；

5. 解决方案管理中添加引用 Microsoft.Data.Odbc.dll(1.0.3300)；

6. 代码中增加引用 using Microsoft.Data.Odbc;

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Drawing;

using System.Linq; //vs2005好像没有这个命名空间，在c#2008下测试自动生成的

using System.Text;

using System.Windows.Forms;

using Microsoft.Data.Odbc;

namespace mysql

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private void Form1_Load(object sender, EventArgs e)

{

string MyConString = "DRIVER={MySQL ODBC 3.51 Driver};" +

"SERVER=localhost;" +

"DATABASE=inv;" +

"UID=root;" +

"PASSWORD=831025;" +

"OPTION=3";

OdbcConnection MyConnection = new OdbcConnection(MyConString);

MyConnection.Open();

Console.WriteLine(""n success, connected successfully !"n");

string query = "insert into test values( 'hello', 'lucas', 'liu')";

OdbcCommand cmd = new OdbcCommand(query, MyConnection);

//处理异常：插入重复记录有异常

try{

cmd.ExecuteNonQuery();

}

catch(Exception ex){

Console.WriteLine("record duplicate.");

}finally{

cmd.Dispose();

}

//***********************用read方法读数据到textbox**********************

string tmp1 = null;

string tmp2 = null;

string tmp3 = null;

query = "select * from test ";

OdbcCommand cmd2 = new OdbcCommand(query, MyConnection);

OdbcDataReader reader = cmd2.ExecuteReader();

while (reader.Read())

{

tmp1 = reader[0].ToString();

tmp2 = reader[1].ToString();

tmp3 = reader[2].ToString();

}

this.textBox1.Text = tmp1 + " " + tmp2 + " " + tmp3;

*/

//************************用datagridview控件显示数据表**************************

string MyConString = "DRIVER={MySQL ODBC 3.51 Driver};" +

"SERVER=localhost;" +

"DATABASE=inv;" +

"UID=root;" +

"PASSWORD=831025;" +

"OPTION=3";

OdbcConnection MyConnection = new OdbcConnection(MyConString);

OdbcDataAdapter oda = new OdbcDataAdapter("select * from customer ", MyConnection);

DataSet ds = new DataSet();

oda.Fill(ds, "employee");

this.dataGridView1.DataSource = ds.Tables["employee"];

*/

MyConnection.Close();

}

}

}

mysql中on,in,as,where如何用,意思是什么?

Where查询条件，on内外连接时候用,as作为别名,in查询某值是否在某条件里

as3.0怎么连接mysql数据库

为了使用简单，我做了一个简单的包装类(包含一个数据结构)：

package com.easily.ds

{

public class DataBaseData

{

public var host:String;

public var port:int;

public var username:String;

public var password:String;

public var database:String;

}

}

package com.easily.util

{

import com.easily.ds.DataBaseData;

import com.maclema.mysql.Connection;

import com.maclema.mysql.Field;

import com.maclema.mysql.MySqlResponse;

import com.maclema.mysql.MySqlToken;

import com.maclema.mysql.ResultSet;

import com.maclema.mysql.Statement;

import flash.events.Event;

import flash.events.EventDispatcher;

import mx.rpc.AsyncResponder;

/**

* @author Easily

*/

public class DataBase extends EventDispatcher

{

private var mDataBase:DataBaseData;

private var mConnection:Connection;

public function DataBase(database:DataBaseData)

{

mDataBase = database;

}

public function connect():void

{

mConnection = new Connection(mDataBase.host, mDataBase.port,

mDataBase.username, mDataBase.password, mDataBase.database);

mConnection.addEventListener(Event.CONNECT, onConnected);

mConnection.connect();

function onConnected(event:Event):void

{

mConnection.removeEventListener(Event.CONNECT, onConnected);

dispatchEvent(event);

}

}

public function disconnect():void

{

mConnection.disconnect();

}

public function select(sql:String, completeHandler:Function, errorHandler:Function = null):void

{

var st:Statement = mConnection.createStatement();

var token:MySqlToken = st.executeQuery(sql);

var responder:AsyncResponder = new AsyncResponder(resultHandler, faultHandler, token);

token.addResponder(responder);

function resultHandler(result:Object/*ResultSet*/, token:Object/*MySqlToken*/):void

{

var data:Array = [];

if (result is ResultSet)

{

var fieldList:Array = result.getColumns();

while (result.next())

{

var item:Object = {};

for each (var field:Field in fieldList)

{

item[field.getName()] = result.getString(field.getName());

}

data.push(item);

}

}

completeHandler(data);

}

function faultHandler(info:Object, token:Object):void

{

if (errorHandler == null) return;

errorHandler();

}

}

public function insert(sql:String, completeHandler:Function, errorHandler:Function = null):void

{

var st:Statement = mConnection.createStatement();

var token:MySqlToken = st.executeQuery(sql);

var responder:AsyncResponder = new AsyncResponder(resultHandler, faultHandler, token);

token.addResponder(responder);

function resultHandler(result:Object/*MySqlResponse*/, token:Object/*MySqlToken*/):void

{

completeHandler(result.insertID);

}

function faultHandler(info:Object, token:Object):void

{

if (errorHandler == null) return;

errorHandler();

}

}

public function remove(sql:String, completeHandler:Function, errorHandler:Function = null):void

{

var st:Statement = mConnection.createStatement();

var token:MySqlToken = st.executeQuery(sql);

var responder:AsyncResponder = new AsyncResponder(resultHandler, faultHandler, token);

token.addResponder(responder);

function resultHandler(result:Object/*MySqlResponse*/, token:Object/*MySqlToken*/):void

{

completeHandler();

}

function faultHandler(info:Object, token:Object):void

{

if (errorHandler == null) return;

errorHandler();

}

}

}

}

其中有3个方法，select,insert,remove，分别对应了SQL语句中的select,insert,delete

用法很简单，先连接：

var databaseData:DataBaseData = new DataBaseData();

databaseData.host = "127.0.0.1";

databaseData.database = "game";

databaseData.password = "123456";

databaseData.port = 3306;

databaseData.username = "root";

var dataBase:DataBase = new DataBase(databaseData);

dataBase.addEventListener(Event.CONNECT, onConnected);

dataBase.connect();

function onConnected(event:Event):void

{

dataBase.removeEventListener(Event.CONNECT, onConnected);

dispatchEvent(new Event(Event.COMPLETE));

}

如果不需要用了可以先断开连接：

dataBase.disconnect();

下面是select语句：

var sql:String = "select id,name from `npc`";

dataBase.select(sql, endQuery);

function endQuery(data:Array):void

{

var npcList:Array= [];

for each (var item:Object in data)

{

var npc:Object = {id:item.id, name:item.name};

npcList.push(npc);

}

}

insert语句用法会返回一个insertID，也就是插入的那条数据的ID。

proper文件连接mysql数据库怎么写

1.打开IDEA，新建一个Web项目，右键点击新建的项目名，选择创建文件目录(Directory)，一般properties文件夹命名应为resoures。

2.右键点击新建的resources文件夹，弹出的窗口里选择Mark Dictory as Resources Root将文件夹定义为配置文件。

3.也可以通过Ctrl+shift+alt+s组合件打开Project Structure面板将需要的文件夹声明为配置文件类型。

(选择文件夹,再点击Mark as:栏里的功能项，就能将文件夹声明为相应的类型）

最后点击OK 完成。

4.右键点击声明为resources类型的文件夹选择Resource Bundle，就能创架一个properties文件了。

5.mysql 的properties配置文件是以键值对形式存读取的，一个对象占用一行，行末不能添加分号。

6.配置文件的使用。

7.以上就是IDEA使用properties配置文件进行mysql数据库连接的方法。