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java里连接数据库代码 java连接数据库的代码( 三 )

IT技术数据库


{
publicOra8iConnect(String db,String id,String pwd)
{ dbNAME=db;
userID=id;
userPWD=pwd;
beginConnect();//连接数据库
}
/*-
*返回一个Connection对象
*/
public Connection getConnection(){return conn;}
/*-
*连接数据库 ， 成功后返回1否则返回0
*/
public int beginConnect()
{ try
{ //加载一个Oracle驱动
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
//使用OCI8连接到数据库
conn=DriverManager.getConnection("jdbc:oracle:oci8:@"+dbNAME,userID,userPWD);
return 1;
}
catch(SQLException e) //捕捉SQL违例
{ System.out.println("Ora8iConnect在连接oracle8数据库时捕获");
while (e!=null)
{ System.out.println("SQLState:"+e.getSQLState());
System.out.println("Message :"+e.getMessage());
System.out.println("Vendor:"+e.getErrorCode());
e=e.getNextException();
System.out.println(" ");
}
conn=null;
return 0;
}
}
private Connection conn; //连接对象
private String dbNAME;//实例
private String userID;//用户名
private String userPWD;//口令
}
java连接数据库的代码用这个类吧.好java里连接数据库代码的话,给java里连接数据库代码我加加分.
import java.sql.*;
/**
* @功能: 一个JDBC的本地化API连接类,封装了数据操作方法,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: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("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;
}
publicstatic 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("执行完查询操作,结果已返回ResultSet集合");
}else if(sql.substring(0, 6).equals("delete")){
ps.executeUpdate(sql);
System.out.println("已执行完毕删除操作");
}else if(sql.substring(0, 6).equals("insert")){
ps.executeUpdate(sql);
System.out.println("已执行完毕增加操作");
}else{
ps.executeUpdate(sql);
System.out.println("已执行完毕更新操作");
}
} 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");

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