java连接MySql和Oracle简单实现

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class MySqlDbManager {
private static MySqlDbManager instance = null;
private MySqlDbManager(){}
public static MySqlDbManager getInstance(){
if(null ==instance){
instance = new MySqlDbManager();
}
return instance;
}
public Connection getConnection() {
Connection connection = null;
String url = "jdbc:mysql://localhost/test";
String usr = "root";
String pwd = "123456";
String driver ="com.mysql.jdbc.Driver";
try {
Class.forName(driver);
connection =DriverManager.getConnection(url, usr, pwd);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
return connection;
}

}

/**
* @author HU-XU
*数据库工具类
*/
public class ToolDButil {

static{
try {
Class.forName("oracle.jdbc.driver.OracleDriver");//"com.mysql.jdbc.Driver"
} catch (ClassNotFoundException e1) {
e1.printStackTrace();
}
}

//返回连接
public static Connection getConnection(){
String jdbcUrl = "jdbc:oracle:thin:@localhost:1521:ORCL";//"jdbc:mysql://localhost/test?user=root&password=root"
String userid = "scott";
String password = "huxu";
Connection conn=null;
try {
conn=DriverManager.getConnection(jdbcUrl, userid, password);
} catch (SQLException e) {
e.printStackTrace();
}
return conn;
}

//释放连接资源
public static void free01(Connection cn,Statement st,ResultSet rs){
try {
if(rs!=null) rs.close();
if(st!=null) st.close();
if(cn!=null) cn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
public static void free02(PreparedStatement ps, Connection cn){
try {
if(ps!=null) ps.close();
if(cn!=null) cn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}