java數(shù)據(jù)庫代碼,java調(diào)用數(shù)據(jù)庫代碼

求Java數(shù)據(jù)庫代碼注釋

代碼主要列出連接數(shù)據(jù)庫的關(guān)鍵代碼,其他訪問數(shù)據(jù)庫代碼省略

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1、Oracle8/8i/9i數(shù)據(jù)庫(thin模式)

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

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

//orcl為數(shù)據(jù)庫的SID

String user="test";

String password="test";

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

2、DB2數(shù)據(jù)庫

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

String url="jdbc:db2://localhost:5000/sample";

//sample為你的數(shù)據(jù)庫名

String user="admin";

String password="";

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

3、Sql Server7.0/2000數(shù)據(jù)庫

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

String url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=mydb";

//mydb為數(shù)據(jù)庫

String user="sa";

String password="";

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

4、Sybase數(shù)據(jù)庫

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

String url =" jdbc:sybase:Tds:localhost:5007/myDB";

//myDB為你的數(shù)據(jù)庫名

Properties sysProps = System.getProperties();

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

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

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

5、Informix數(shù)據(jù)庫

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

String url =

"jdbc:informix-sqli://123.45.67.89:1533/myDB:INFORMIXSERVER=myserver;

user=testuser;password=testpassword";

//myDB為數(shù)據(jù)庫名

Connection conn= DriverManager.getConnection(url);

6、MySQL數(shù)據(jù)庫

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

String url ="jdbc:mysql://localhost/myDB?user=softpassword=soft1234useUnicode=truecharacterEncoding=8859_1"

//myDB為數(shù)據(jù)庫名

Connection conn= DriverManager.getConnection(url);

7、PostgreSQL數(shù)據(jù)庫

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

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

//myDB為數(shù)據(jù)庫名

String user="myuser";

String password="mypassword";

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

java連接數(shù)據(jù)庫的代碼

用這個類吧.好的話,給我加加分.

import java.sql.*;

/**

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

* @作者: 李開歡

* @日期: 2007/

*/

public class ConnectionDemo {

/*

* 這里可以將常量全部放入另一個類中,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 "+"類 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();

}

}

用Java怎樣訪問數(shù)據(jù)庫,用什么代碼?

1. 加載一個對應(yīng)數(shù)據(jù)庫的JDBC驅(qū)動

在建立到一個數(shù)據(jù)庫的連接之前,必須先加載這個數(shù)據(jù)庫的JDBC驅(qū)動程序,加載之后此driver會自動注冊到JDBC驅(qū)動列表中。加載一個JDBC驅(qū)動有兩種方法。

a) 在命令行方式下指定驅(qū)動器或者用冒號分割驅(qū)動器列表:

具體命令如下:

C:\java –Djdbc.drivers = com.company1.Driver:com.company2.Driver youProject

b)第二種方法,在程序中調(diào)用Class.forName()方法。推薦使用。。。。

try

{

String driverName = “com.imaginary.sql.msql.MsqlDriver”;

Class.forName(driverName).newInstance();

}

Catch(ClassNotFoundException e1)

{

//catch could not find database driver exception.

}

2.連接到數(shù)據(jù)庫。

根據(jù)您后臺待連接的數(shù)據(jù)庫不同,而有小小的差別。

a) 連接到Oracle數(shù)據(jù)庫。

Connection connection = null ;

try

{

//load the jdbc driver ;

String driverName = “oracle.jdbc.driver.OracleDriver”;

Class.forName(driverName).newInstance();

//create a connection to the database;

String serverName = “127.0.0.1”;

String serverPort = “1521”;

String serverID = “datebase1”

String userName = “hello”;

String userPsw = “world”;

String url = “jdbc:oracle.thin:@” + serverName + “:” + serverPort + “:” + serverID ;

Connection = DriverManager.getConnection(url , userName , userPsw);

}

catch(ClassNotFoundException e1)

{

//catch could not find database driver exception.

}

catch(SQLException e2)

{

//catch could not connect to the database exception.

}

b) 連接到一個SQL Server數(shù)據(jù)庫。

Connection connection = null ;

try

{

//load the jdbc driver ;

String driverName = “com.microsoft.jdbc.sqlserver.SQLServerDriver”;

Class.forName(driverName).newInstance();

//create a connection to the database;

String serverName = “127.0.0.1”;

String serverPort = “1433”;

String serverID = serverName + serverPort ;

String userName = “hello”;

String userPsw = “world”;

String url = “jdbc:JSQLConnect ://” + serverID ;

Connection = DriverManager.getConnection(url , userName , userPsw);

}

catch(ClassNotFoundException e1)

{

//catch could not find database driver exception.

}

catch(SQLException e2)

{

//catch could not connect to the database exception.

}

c) 連接到一個MySQL數(shù)據(jù)庫上。。。。

Connection connection = null ;

try

{

//load the jdbc driver ;

String driverName = “org.gjt.mm.mysql.Driver”;

Class.forName(driverName).newInstance();

//create a connection to the database;

String serverName = “127.0.0.1”;

String serverID = “database”;

String userName = “hello”;

String userPsw = “world”;

String url = “jdbc:mysql ://” + serverName + “/” + serverID ;

Connection = DriverManager.getConnection(url , userName , userPsw);

}

catch(ClassNotFoundException e1)

{

//catch could not find database driver exception.

}

catch(SQLException e2)

{

//catch could not connect to the database exception.

}

綜合上面的三種數(shù)據(jù)庫連接方式 , 其實大同小異。由于訪問不同的數(shù)據(jù)庫和所使用的數(shù)據(jù)庫驅(qū)動程序不同,所以導(dǎo)致代碼表面上有小小不同,但透過表面看來,內(nèi)部都是

1. 加載一個特定的數(shù)據(jù)庫JDBC驅(qū)動。

2. 連接到一個數(shù)據(jù)庫。

3. 之后,就可以對一個特定的數(shù)據(jù)庫進行特定的操作了。

附上各種數(shù)據(jù)庫的JDBC驅(qū)動起可用信息網(wǎng)址:

對于Oracle數(shù)據(jù)庫,請參考:

對于MySQL數(shù)據(jù)庫,請參考:

對于SQL Server數(shù)據(jù)庫,有很多的驅(qū)動可選,比較常用的:

java連接sqlserver數(shù)據(jù)庫代碼

%

String sqlDriver="com.microsoft.sqlserver.jdbc.SQLServerDriver";

String url="jdbc:sqlserver://localhost:1433;DatabaseName=自己的數(shù)據(jù)庫名字";

String user="用戶名";

String password="密碼";

Connection conn=null;

try{

Class.forName(sqlDriver).newInstance();

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

// out.println("數(shù)據(jù)庫加載成功");

}catch(Exception e){

// out.println("數(shù)據(jù)庫加載出現(xiàn)錯誤!");

}

%

一段java中數(shù)據(jù)庫代碼解釋

StringBuffer

sqlq=new

StringBuffer("

SELECT

*

FROM

")

;//申明一個可變字符串

,要存了一個sql語句,并且由"

SELECT

*

FROM

"可知其為一個select查詢語句

sqlq.append(DtoMapGroupOptions.DB_TABLE_NAME)

;//DtoMapGroupOptions.DB_TABLE_NAME應(yīng)該是一個字符串,字面值為一個表的名稱,要在這個表里查數(shù)據(jù)

sqlq.append("

ORDER

BY

")

;//這個制定查出來的結(jié)果集需要排序

sqlq.append(DtoMapGroupOptions.COLUMN_optionID)

;//DtoMapGroupOptions.COLUMN_optionID應(yīng)該是某一列的列名,根據(jù)這一列來排序,如果這一列是數(shù)字,那么就會根據(jù)數(shù)字大小排,字符串可能按abc排,和excel排序時一樣的,即根據(jù)某一列來擴展至整個區(qū)域排序

sqlq.append("

DESC

")

;//這個事制定按降序還是升序,這里是降序

//后面的語句要看上下文,那個pb不知是什么

ListRow

list

=

null

;

pb.isRequireTotalRow(true);

String

sqlStr=sqlq.toString();

list

=

pb.getInfo(sqlStr,

null,

DtoMapGroupOptions.DATA_SOURCE_ID);//可能是把結(jié)果集放入list中,根據(jù)sqlStr中的sql語句

JAVA連接數(shù)據(jù)庫連接代碼怎么寫?

1 將數(shù)據(jù)庫的JDBC驅(qū)動加載到classpath中,在基于JAVAEE的WEB應(yīng)用實際開發(fā)過程中,通常要把目標數(shù)據(jù)庫產(chǎn)品的JDBC驅(qū)動復(fù)制到WEB-INF/lib下.

2 加載JDBC驅(qū)動,并將其注冊到DriverManager中,下面是一些主流數(shù)據(jù)庫的JDBC驅(qū)動加裁注冊的代碼:

//Oracle8/8i/9iO數(shù)據(jù)庫(thin模式)

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

//Sql Server7.0/2000數(shù)據(jù)庫

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

//DB2數(shù)據(jù)庫

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

//Informix數(shù)據(jù)庫

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

//Sybase數(shù)據(jù)庫

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

//MySQL數(shù)據(jù)庫

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

//PostgreSQL數(shù)據(jù)庫

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

3 建立數(shù)據(jù)庫連接,取得Connection對象.例如:

//Oracle8/8i/9i數(shù)據(jù)庫(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!我已經(jīng)把完整的代碼發(fā)到你QQ郵箱了!

當前名稱:java數(shù)據(jù)庫代碼,java調(diào)用數(shù)據(jù)庫代碼
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