java怎么和數(shù)據(jù)庫(kù)連接

使用java連接MySQL數(shù)據(jù)庫(kù)與其他的數(shù)據(jù)庫(kù)連接核心是一樣的，如果說(shuō)區(qū)別，那就是所需的驅(qū)動(dòng)不一樣。

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工具/原料

MySQL、JDK

方法/步驟

1、首先需要安裝好JDK（配置環(huán)境變量）,如圖所示：

2、其次要安裝好MySQL數(shù)據(jù)庫(kù)，可以使用可視化Navicar For MySQL，如圖所示：

3、最后通過(guò)代碼進(jìn)行連接。

（1）確定連接路徑URL：

String url="jdbc:mysql://localhost(可以是本機(jī)IP地址):3306(端口號(hào))/mysqltest(數(shù)據(jù)庫(kù)名稱(chēng))？"+"user=用戶(hù)賬號(hào)password=用戶(hù)密碼useUnicode=字符編碼";

（2）加載驅(qū)動(dòng)：

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

（3）連接，獲取Connection對(duì)象

Connection conn=DriverManager.getConnection(url)

（4）可以通過(guò)conn對(duì)象檢驗(yàn)連接與否。

JAVA中連接數(shù)據(jù)庫(kù)的代碼 請(qǐng)教

private static String url="jdbc:oracle:thin:@localhost:1521:xe";

聲明一個(gè)字符串用于存儲(chǔ)數(shù)據(jù)庫(kù)連接信息，jdbc:oracle:thin:@localhost:1521表示你要連接的是oracle數(shù)據(jù)庫(kù)地址是本機(jī)

xe為本機(jī)數(shù)據(jù)庫(kù)庫(kù)名。

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

這一條是聲明一個(gè)字符串存儲(chǔ)數(shù)據(jù)庫(kù)驅(qū)動(dòng)

JAVA連接數(shù)據(jù)庫(kù)連接代碼怎么寫(xiě)？

//連接mysql，先導(dǎo)入mysql驅(qū)動(dòng)

Connection?conn;?//?聲明Connectoion對(duì)象

String?driver?=?"com.mysql.jdbc.Driver";?//?驅(qū)動(dòng)程序名

//oracle，先導(dǎo)入oracle驅(qū)動(dòng)

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

//String?url="jdbc:oracle:this@localhost:1521:testdb ";????//中間冒號(hào)分隔

String?url?=?"jdbc:mysql://localhost:3306/testdb";?//?要訪問(wèn)的數(shù)據(jù)庫(kù)

String?user?=?"root";

String?password?=?"root";

Class.forName(driver);?//?加載驅(qū)動(dòng)

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

java連接數(shù)據(jù)庫(kù)的代碼

用這個(gè)類(lèi)吧.好的話,給我加加分.

import java.sql.*;

/**

* @功能: 一個(gè)JDBC的本地化API連接類(lèi),封裝了數(shù)據(jù)操作方法,只用傳一個(gè)SQL語(yǔ)句即可

* @作者: 李開(kāi)歡

* @日期: 2007/

*/

public class ConnectionDemo {

/*

* 這里可以將常量全部放入另一個(gè)類(lèi)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:1433;DatabaseName=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("連接中...");

try {

Class.forName(ConnectionDemo.DRIVER);

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

System.out.println("成功連接");

} 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("執(zhí)行SQL語(yǔ)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("執(zhí)行完查詢(xún)操作,結(jié)果已返回ResultSet集合");

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

ps.executeUpdate(sql);

System.out.println("已執(zhí)行完畢刪除操作");

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

ps.executeUpdate(sql);

System.out.println("已執(zhí)行完畢增加操作");

}else{

ps.executeUpdate(sql);

System.out.println("已執(zhí)行完畢更新操作");

}

} catch (SQLException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return ps;

}

public static ResultSet getResultSet(){

System.out.println("查詢(xún)結(jié)果為:");

return rs;

}

public static void closeConnection(){

System.out.println("關(guān)閉連接中...");

try {

if (rs != null) {

rs.close();

System.out.println("已關(guān)閉ResultSet");

}

if (ps != null) {

ps.close();

System.out.println("已關(guān)閉Statement");

}

if (conn != null) {

conn.close();

System.out.println("已關(guān)閉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,'教學(xué)設(shè)備')";

ConnectionDemo.getStatement(sql2);

String sql1 = "select * from type";

ConnectionDemo.getStatement(sql1);

ResultSet rs = ConnectionDemo.getResultSet();

System.out.println("編號(hào) "+"類(lèi) 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();

}

}

連接數(shù)據(jù)庫(kù)的代碼用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變量定義

private JTable table;

private JTextArea inputQuery;

private JButton submitQuery;

public inensshow()

{

//Form的標(biāo)題

super( "輸入SQL語(yǔ)句，按查詢(xún)按鈕查看結(jié)果。" );

String url = "jdbc:mysql://localhost:3306/web";

String username = "inens";

String password = "inens";

//加載驅(qū)動(dòng)程序以連接數(shù)據(jù)庫(kù)

try {

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

connection = DriverManager.getConnection(

url, username, password );

}

//捕獲加載驅(qū)動(dòng)程序異常

catch ( ClassNotFoundException cnfex ) {

System.err.println(

"裝載 JDBC/ODBC 驅(qū)動(dòng)程序失敗。" );

cnfex.printStackTrace();

System.exit( 1 ); // terminate program

}

//捕獲連接數(shù)據(jù)庫(kù)異常

catch ( SQLException sqlex ) {

System.err.println( "無(wú)法連接數(shù)據(jù)庫(kù)" );

sqlex.printStackTrace();

System.exit( 1 ); // terminate program

}

//如果數(shù)據(jù)庫(kù)連接成功，則建立GUI

//SQL語(yǔ)句

String test="SELECT * FROM data";

inputQuery = new JTextArea( test, 4, 30 );

submitQuery = new JButton( "查詢(xún)" );

//Button事件

submitQuery.addActionListener(

new ActionListener() {

public void actionPerformed( ActionEvent e )

{

getTable();

}

}

);

JPanel topPanel = new JPanel();

topPanel.setLayout( new BorderLayout() );

//將"輸入查詢(xún)"編輯框布置到 "CENTER"

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

//將"提交查詢(xún)"按鈕布置到 "SOUTH"

topPanel.add( submitQuery, BorderLayout.SOUTH );

table = new JTable();

Container c = getContentPane();

c.setLayout( new BorderLayout() );

//將"topPanel"編輯框布置到 "NORTH"

c.add( topPanel, BorderLayout.NORTH );

//將"table"編輯框布置到 "CENTER"

c.add( table, BorderLayout.CENTER );

getTable();

setSize( 500, 300 );

//顯示Form

show();

}

private void getTable()

{

try {

//執(zhí)行SQL語(yǔ)句

String query = inputQuery.getText();

statement = connection.createStatement();

resultSet = statement.executeQuery( query );

//在表格中顯示查詢(xún)結(jié)果

displayResultSet( resultSet );

}

catch ( SQLException sqlex ) {

sqlex.printStackTrace();

}

}

private void displayResultSet( ResultSet rs )

throws SQLException

{

//定位到達(dá)第一條記錄

boolean moreRecords = rs.next();

//如果沒(méi)有記錄，則提示一條消息

if ( ! moreRecords ) {

JOptionPane.showMessageDialog( this,

"結(jié)果集中無(wú)記錄" );

setTitle( "無(wú)記錄顯示" );

return;

}

Vector columnHeads = new Vector();

Vector rows = new Vector();

try {

//獲取字段的名稱(chēng)

ResultSetMetaData rsmd = rs.getMetaData();

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

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

//獲取記錄集

do {

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

} while ( rs.next() );

//在表格中顯示查詢(xún)結(jié)果

table = new JTable( rows, columnHeads );

JScrollPane scroller = new JScrollPane( table );

Container c = getContentPane();

c.remove(1);

c.add( scroller, BorderLayout.CENTER );

//刷新Table

c.validate();

}

catch ( SQLException sqlex ) {

sqlex.printStackTrace();

}

}

private Vector getNextRow( ResultSet rs,

ResultSetMetaData rsmd )

throws SQLException

{

Vector currentRow = new Vector();

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

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

//返回一條記錄

return currentRow;

}

public void shutDown()

{

try {

//斷開(kāi)數(shù)據(jù)庫(kù)連接

connection.close();

}

catch ( SQLException sqlex ) {

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

sqlex.printStackTrace();

}

}

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 );

}

}

);

}

}

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

這次在WIN98中就不好使了。因?yàn)镸ysql的驅(qū)動(dòng)程序沒(méi)有也沒(méi)能加入到CLASSPATH 當(dāng)中，但是JSP卻可以使用（JSP的98驅(qū)動(dòng)加載詳見(jiàn)Jsp與Mysql連接查錯(cuò)文章），所以這次我是在XPServer中測(cè)試的。

文章名稱(chēng)：數(shù)據(jù)庫(kù)連接java代碼,java中連接數(shù)據(jù)庫(kù)的代碼
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