java连接数据库的代码

用这个类吧.好的话,给我加加分.

import java.sql.*

/**

* @功能: 一个JDBC的本地化API连接类,封装了数据 *** 作方法,只用传一个SQL语句即可

* @作者: 李开欢

* @日期: 2007/

*/

public class ConnectionDemo {

/*

* 这里可以将常量全部放入另一个类中,以方便修改

*/

private static Connection conn

private static Statement ps

private static ResultSet rs

private static final String DRIVER = "com.microsoft.jdbc.sqlserver.SQLServerDriver"

private static final String URL = "jdbc:microsoft:sqlserver://localhost:1433DatabaseName=mydb"

private static final String USER ="sa"

private static final String PASS = "sa"

public ConnectionDemo() {

// TODO Auto-generated constructor stub

ConnectionDemo.getConnection()

}

public static Connection getConnection(){

System.out.println("连接中...")

try {

Class.forName(ConnectionDemo.DRIVER)

conn = DriverManager.getConnection(ConnectionDemo.URL, ConnectionDemo.USER, ConnectionDemo.PASS)

System.out.println("成功连接")

} catch (ClassNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace()

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace()

}

return conn

}

public static Statement getStatement(String sql){

System.out.println("执行SQL语句中...")

try {

ps = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE)

if(sql.substring(0, 6).equals("select")){

rs = ps.executeQuery(sql)

System.out.println("执行完查询 *** 作,结果已返回ResultSet集合")

}else if(sql.substring(0, 6).equals("delete")){

ps.executeUpdate(sql)

System.out.println("已执行完毕删除 *** 作")

}else if(sql.substring(0, 6).equals("insert")){

ps.executeUpdate(sql)

System.out.println("已执行完毕增加 *** 作")

}else{

ps.executeUpdate(sql)

System.out.println("已执行完毕更新 *** 作")

}

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace()

}

return ps

}

public static ResultSet getResultSet(){

System.out.println("查询结果为:")

return rs

}

public static void closeConnection(){

System.out.println("关闭连接中...")

try {

if (rs != null) {

rs.close()

System.out.println("已关闭ResultSet")

}

if (ps != null) {

ps.close()

System.out.println("已关闭Statement")

}

if (conn != null) {

conn.close()

System.out.println("已关闭Connection")

}

} catch (Exception e) {

// TODO: handle exception

}

}

public static void main(String[] args) {

// TODO Auto-generated method stub

ConnectionDemo.getConnection()

String sql = "delete from type where id = 1"

ConnectionDemo.getStatement(sql)

String sql2 = "insert into type values(1,'教学设备')"

ConnectionDemo.getStatement(sql2)

String sql1 = "select * from type"

ConnectionDemo.getStatement(sql1)

ResultSet rs = ConnectionDemo.getResultSet()

System.out.println("编号 "+"类型")

try {

while(rs.next()){

System.out.print(" "+rs.getInt(1)+" ")

System.out.println(rs.getString(2))

}

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace()

}

ConnectionDemo.closeConnection()

}

}

1 将数据库的JDBC驱动加载到classpath中，在基于JAVAEE的WEB应用实际开发过程中，通常要把目标数据库产品的JDBC驱动复制到WEB-INF/lib下.

2 加载JDBC驱动，并将其注册到DriverManager中，下面是一些主流数据库的JDBC驱动加裁注册的代码:

//Oracle8/8i/9iO数据库(thin模式)

Class.forName("oracle.jdbc.driver.OracleDriver").newInstance()

//Sql Server7.0/2000数据库

Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver").newInstance()

//DB2数据库

Class.froName("com.ibm.db2.jdbc.app.DB2Driver").newInstance()

//Informix数据库

Class.forName("com.informix.jdbc.IfxDriver").newInstance()

//Sybase数据库

Class.forName("com.sybase.jdbc.SybDriver").newInstance()

//MySQL数据库

Class.forName("com.mysql.jdbc.Driver").newInstance()

//PostgreSQL数据库

Class.forNaem("org.postgresql.Driver").newInstance()

3 建立数据库连接，取得Connection对象.例如:

//Oracle8/8i/9i数据库(thin模式)

String url="jdbc:oracle:thin:@localhost:1521:orcl"

String user="scott"

String password="tiger"

Connection conn=DriverManager.getConnection(url,user,password)

-->完整的太多了！我已经把完整的代码发到你QQ邮箱了！

import java.sql.* public class Test{public static void main(String[] args) throws Exception{Class.forName("com.mysql.jdbc.Driver") //一开始必须填一个已经存在的数据库String url = "jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8" Connection conn = DriverManager.getConnection(url, "root", "123456") Statement stat = conn.createStatement() //创建数据库hellostat.executeUpdate("create database hello") //打开创建的数据库stat.close() conn.close() url = "jdbc:mysql://localhost:3306/hello?useUnicode=true&characterEncoding=utf-8" conn = DriverManager.getConnection(url, "root", "123456") stat = conn.createStatement() //创建表teststat.executeUpdate("create table test(id int, name varchar(80))") //添加数据stat.executeUpdate("insert into test values(1, '张三')") stat.executeUpdate("insert into test values(2, '李四')") //查询数据ResultSet result = stat.executeQuery("select * from test") while (result.next()){System.out.println(result.getInt("id") + " " + result.getString("name")) } //关闭数据库result.close() stat.close() conn.close() }}

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