java数据库的连接代码_java数据库面试题

java怎么和数据库连接

使用java连接MySQL数据库与其他的数据库连接核心是一样的,如果说区别,那就是所需的驱动不一样.

工具/原料

MySQL、JDK

方法/步骤

①.、首先需要安装好JDK（配置环境变量）,如图所示：

（1）确定连接路径URL：

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

Connection conn=DriverManager.getConnection(url)

JAVA连接数据库连接代码怎么写?

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.

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

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

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！

连接数据库的代码用java怎么做?

import java.sql.*;

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.util.*;

public class inensshow extends JFrame {

private Connection connection;

private Statement statement;

private ResultSet resultSet;

private ResultSetMetaData rsMetaData;

//GUI变量定义

private JTable table;

private JTextArea inputQuery;

private JButton submitQuery;

public inensshow()

{

//Form的标题

super( "输入SQL语句,按查询按钮查看结果." );

String username = "inens";

String password = "inens";

//加载驱动程序以连接数据库

try {

Class.forName( "org.gjt.mm.mysql.Driver" );

connection = DriverManager.getConnection(

url, username, password );

}

//捕获加载驱动程序异常

catch ( ClassNotFoundException cnfex ) {

System.err.println(

"装载 JDBC/ODBC 驱动程序失败." );

cnfex.printStackTrace();

System.exit( 1 ); // terminate program

//捕获连接数据库异常

catch ( SQLException sqlex ) {

System.err.println( "无法连接数据库" );

sqlex.printStackTrace();

//如果数据库连接成功,则建立GUI

//SQL语句

String test="SELECT * FROM data";

submitQuery = new JButton( "查询" );

//Button事件

submitQuery.addActionListener(

new ActionListener() {

public void actionPerformed( ActionEvent e )

getTable();

);

JPanel topPanel = new JPanel();

topPanel.setLayout( new BorderLayout() );

topPanel.add( new JScrollPane( inputQuery), BorderLayout.CENTER );

//将"提交查询"按钮布置到 "SOUTH"

topPanel.add( submitQuery, BorderLayout.SOUTH );

table = new JTable();

Container c = getContentPane();

c.setLayout( new BorderLayout() );

c.add( topPanel, BorderLayout.NORTH );

c.add( table, BorderLayout.CENTER );

//显示Form

show();

private void getTable()

//执行SQL语句

String query = inputQuery.getText();

statement = connection.createStatement();

resultSet = statement.executeQuery( query );

//在表格中显示查询结果

throws SQLException

//定位到达第一条记录

boolean moreRecords = rs.next();

//如果没有记录,则提示一条消息

if ( ! moreRecords ) {

JOptionPane.showMessageDialog( this,

"结果集中无记录" );

setTitle( "无记录显示" );

return;

Vector columnHeads = new Vector();

Vector rows = new Vector();

//获取字段的名称

ResultSetMetaData rsmd = rs.getMetaData();

for ( int i = 1; i = rsmd.getColumnCount(); ++i )

columnHeads.addElement( rsmd.getColumnName( i ) );

//获取记录集

do {

rows.addElement( getNextRow( rs, rsmd ) );

} while ( rs.next() );

table = new JTable( rows, columnHeads );

JScrollPane scroller = new JScrollPane( table );

c.remove(1);

c.add( scroller, BorderLayout.CENTER );

//刷新Table

c.validate();

private Vector getNextRow( ResultSet rs,

ResultSetMetaData rsmd )

Vector currentRow = new Vector();

currentRow.addElement( rs.getString( i ) );

//返回一条记录

return currentRow;

public void shutDown()

//断开数据库连接

connection.close();

System.err.println( "Unable to disconnect" );

public static void main( String args[] )

final inensshow app =

new inensshow();

app.addWindowListener(

new WindowAdapter() {

public void windowClosing( WindowEvent e )

app.shutDown();

System.exit( 0 );

------------------------------------------------------------

求java与数据库连接的代码（含注释）

代码主要列出连接数据库的关键代码,其他访问数据库代码省略

//orcl为数据库的SID

String user="test";

String password="test";

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

//sample为你的数据库名

String user="admin";

String password="";

//mydb为数据库

String user="sa";

//myDB为你的数据库名

Properties sysProps = System.getProperties();

SysProps.put("user","userid");

SysProps.put("password","user_password");

Connection conn= DriverManager.getConnection(url, SysProps);

String url =

user=testuser;password=testpassword";

//myDB为数据库名

Connection conn= DriverManager.getConnection(url);

Class.forName("org.gjt.mm.mysql.Driver").newInstance();

Class.forName("org.postgresql.Driver").newInstance();

String url ="jdbc:postgresql://localhost/myDB"

String user="myuser";

String password="mypassword";

JAVA中连接数据库的代码 请教

xe为本机数据库库名.

private static String driverName="oracle.jdbc.driver.OracleDriver";

这一条是声明一个字符串存储数据库驱动

java连接数据库的代码

用这个类吧.好的话,给我加加分.

/**

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

*/

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 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...");

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) {

return conn;

public static Statement getStatement(String sql){

System.out.println("执行SQL语句中...");

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

rs = ps.executeQuery(sql);

System.out.println("执行完查询操作,结果已返回ResultSet集合");

ps.executeUpdate(sql);

System.out.println("已执行完毕删除操作");

System.out.println("已执行完毕增加操作");

}else{

System.out.println("已执行完毕更新操作");

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...");

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

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

ConnectionDemo.getStatement(sql);

String sql1 = "select * from type";

ConnectionDemo.getStatement(sql1);

ResultSet rs = ConnectionDemo.getResultSet();

System.out.println("编号 "+"类 型");

while(rs.next()){

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

ConnectionDemo.closeConnection();

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