在java的应用中,我们经常会对数据库进行必要的操作,下来我们就了解一下如何用java连接mysql数据库 以及java连接sql server数据库
一、mysql
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import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class TestOne {
private static Connection connection;
private static Statement statement;
private static ResultSet result;
public static void main(String[] args) {
try {
//加载jdbc驱动程序
Class.forName( "com.mysql.jdbc.Driver" );
//指明主机名(默认为:127.0.0.1)和端口号(默认为:3306)以及数据库名(必须指定)
String url = "jdbc:mysql://localhost:3306/test1" ;
//与数据库建立连接
connection = DriverManager.getConnection(url, "root" , "123456" );
//创建一个Statement对象将SQL语句发送到数据库
statement = connection.createStatement();
//将查询结果返回给result
result = statement.executeQuery( "select *from user" );
while (result.next()){
System.out.println( "name:" + result.getString( 1 ) + " password:" + result.getString( 2 ));
}
connection.close();
result.close();
statement.close();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
try {
if (connection != null )
connection.close();
if (result != null )
result.close();
if (statement != null )
statement.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
/**
* mysql> select *from user;
*+----------+----------+
*| name | password |
*+----------+----------+
*| lisi | 123456 |
*| wangwu | 123456 |
*| zhangsan | 123456 |
*+----------+----------+
*3 rows in set (0.54 sec)
*
*在java中的输出结果
*name:lisi password:123456
*name:wangwu password:123456
*name:zhangsan password:123456
*/
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二、sql server
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import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class TestDemo {
public static void main(String[] args) {
String url= "jdbc:sqlserver://localhost:1433;DatabaseName=Contellation" ;
Connection conn = null ;
try {
Class.forName( "com.microsoft.sqlserver.jdbc.SQLServerDriver" );
conn = DriverManager.getConnection(url, "sa" , "" );
Statement statement=conn.createStatement();
ResultSet rs = statement.executeQuery( "select * from dbo.登陆表 " );
while (rs.next()){
System.out.println( "用户名:" + rs.getString( 1 ) + " 密码:" + rs.getString( 2 ));
}
conn.close();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
/**
* java中的输出结果
* 用户名:张三 密码:123456
*用户名:李四 密码:111111
*用户名:王五 密码:123654
*用户名:王延暾 密码:0123456789
*用户名:曾安新 密码:123456
*/
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以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。